WO2012029360A1 - Illumination device and display device - Google Patents

Illumination device and display device Download PDF

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Publication number
WO2012029360A1
WO2012029360A1 PCT/JP2011/061391 JP2011061391W WO2012029360A1 WO 2012029360 A1 WO2012029360 A1 WO 2012029360A1 JP 2011061391 W JP2011061391 W JP 2011061391W WO 2012029360 A1 WO2012029360 A1 WO 2012029360A1
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WO
WIPO (PCT)
Prior art keywords
led
light
leds
light source
backlight unit
Prior art date
Application number
PCT/JP2011/061391
Other languages
French (fr)
Japanese (ja)
Inventor
満 細木
Original Assignee
シャープ株式会社
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Publication of WO2012029360A1 publication Critical patent/WO2012029360A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133611Direct backlight including means for improving the brightness uniformity

Definitions

  • the present invention relates to a lighting device and a display device, and more particularly to a lighting device in which light sources are two-dimensionally arranged and a display device including the lighting device.
  • a backlight unit for supplying light is usually mounted on the liquid crystal display panel.
  • the backlight unit is preferably configured to generate planar light that spreads over the entire area of the planar liquid crystal display panel.
  • a direct backlight unit is known as a backlight unit for supplying light to a liquid crystal display panel.
  • the direct type backlight unit has a configuration in which a plurality of LEDs (Light Emitting Diodes) serving as a light source are arranged below the diffusion plate. And it is comprised so that the light from several LED may be spread
  • LEDs Light Emitting Diodes
  • the conventional direct type backlight unit has a disadvantage that the luminance is lowered at the edge of the screen. Therefore, there is a problem that it is difficult to improve luminance uniformity.
  • the present invention has been made to solve the above-described problems, and one object of the present invention is to improve luminance uniformity by suppressing luminance reduction at the end.
  • An illumination device and a display device equipped with the illumination device are provided.
  • an illumination apparatus includes a plurality of light sources and a base on which the plurality of light sources are two-dimensionally arranged.
  • the substrate is formed in a substantially rectangular shape having a pair of long sides and a pair of short sides when seen in a plan view, and at least each of the end portions on the long side has the light source, More than the central part of the substrate are arranged.
  • the luminance at the end portion on the long side is increased by disposing more light sources than the central portion of the base at each end portion on the long side. Can be increased. Thereby, since the fall of the brightness
  • the end portion on the long side is longer than the end portion on the short side, it is possible to effectively improve the luminance uniformity by increasing the luminance of at least the end portions on the long side.
  • the number of light sources arranged at the end on the long side is preferably about several to 10% larger than the number of light sources arranged at the center of the base.
  • each of the plurality of light sources includes a light emitting diode, and the forward current of the light emitting diode is set to be substantially the same in each of the plurality of light sources. preferable.
  • the light emitting diode is preferably a white light emitting diode.
  • the plurality of light sources are preferably connected in series in the long side direction. If comprised in this way, since the structure of an illuminating device can be simplified, the illuminating device which can improve a brightness
  • luminance uniformity can be obtained at low cost.
  • the lighting device preferably further includes a light source control unit that controls driving of a plurality of light sources.
  • the light source control unit may include a first light source control unit and a second light source control unit different from the first light source control unit.
  • the first light source control unit controls the driving of the light source arranged at the end on the long side
  • the second light source control unit controls the driving of the light source arranged at the center of the base. Can be configured.
  • more light sources are arranged at each of the end portions on the short side than at the central portion of the base. If comprised in this way, a brightness
  • the light source disposed at the end portion on the short side may be configured to have higher luminance than the light source disposed at the center portion of the base. If comprised in this way, since a brightness
  • a display device includes the illumination device according to the first aspect and a display panel that receives light from the illumination device. If comprised in this way, the display apparatus with the high brightness uniformity which the brightness fall at the edge part was suppressed can be obtained easily.
  • an illuminating device capable of improving luminance uniformity and a display device equipped with the illuminating device by suppressing a decrease in luminance at the end. it can.
  • FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention. It is the top view (figure which showed the arrangement state of LED used for a backlight unit) which showed a part of backlight unit by a 1st embodiment of the present invention. It is the top view which showed a part of backlight unit by 1st Embodiment of this invention.
  • FIG. 3 is a cross-sectional view of the backlight unit (liquid crystal display device) according to the first embodiment of the present invention (a view corresponding to a cross section taken along the line AA in FIG. 2). It is the schematic diagram which showed the connection state of LED of the backlight unit by 1st Embodiment of this invention.
  • FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention.
  • 2 and 3 are plan views showing a part of the backlight unit according to the first embodiment of the present invention.
  • 4 to 8 are diagrams for explaining the backlight unit according to the first embodiment of the present invention.
  • FIG. 2 the arrangement
  • the liquid crystal display device 100 includes a liquid crystal display panel 10, a backlight unit 50 that supplies light to the liquid crystal display panel 10, and a pair facing each other with these interposed therebetween.
  • Housing 70 front housing 71, back housing 72.
  • the liquid crystal display device 100 is an example of the “display device” in the present invention
  • the liquid crystal display panel 10 is an example of the “display panel” in the present invention
  • the backlight unit 50 is an example of the “lighting device” in the present invention.
  • an active matrix substrate 11 including a switching element such as a TFT (Thin Film Transistor) and an opposite substrate 12 facing the active matrix substrate 11 are bonded to each other with a sealing material (not shown). It is constituted by.
  • a liquid crystal (not shown) is injected into the gap between the substrates 11 and 12.
  • a polarizing film 13 is attached to each of the light receiving surface side of the active matrix substrate 11 and the light emitting surface side of the counter substrate 12.
  • the liquid crystal display panel 10 configured in this manner displays an image by using a change in transmittance caused by the tilt of liquid crystal molecules.
  • the backlight unit 50 is a direct-type backlight unit, and includes the LED module 20, the backlight chassis 30, the reflection sheet 40, the diffusion plate 45, the prism sheet 46, and the lens sheet 47. is doing.
  • the backlight unit 50 is disposed directly below the liquid crystal display panel 10.
  • the backlight chassis 30 is a substantially box-shaped member opened on the liquid crystal display panel 10 side, and has a bottom portion 30a and a side portion 30b provided on the outer periphery of the bottom portion 30a.
  • the backlight chassis 30 is formed, for example, by processing a metal plate-like member, and accommodates them by spreading the LED module 20 and the reflection sheet 40 on the bottom surface 30c.
  • region enclosed by the side part 30b of the backlight chassis 30 becomes substantially rectangular shape (substantially rectangular shape), and the area
  • the backlight chassis 30 is formed in a substantially rectangular shape, and therefore has a pair of long sides 31 and a pair of short sides 32 in plan view. Yes.
  • the backlight chassis 30 is an example of the “base” in the present invention.
  • the LED module 20 constituting the backlight unit 50 is a module that emits light, and includes a mounting substrate 21 and an LED 22 as a light source mounted on the mounting surface 21a of the mounting substrate 21.
  • the mounting substrate 21 is a plate-like and rectangular substrate, and a plurality of electrodes (not shown) are arranged on the mounting surface 21a. And said LED22 is attached on these electrodes.
  • the LED 22 is mounted on an electrode (not shown) formed on the mounting surface 21a of the mounting substrate 21 so as to receive light and emit light.
  • a plurality of LEDs 22 as light sources are mounted in the accommodation area of the backlight chassis 30.
  • Each of the plurality of LEDs 22 is composed of a white LED (white light emitting diode), and is two-dimensionally arranged in the accommodation region of the backlight chassis 30 (on the bottom surface 30c of the backlight chassis 30).
  • the same type of white LED is used for the plurality of LEDs 22. That is, the backlight unit 50 according to the first embodiment includes a plurality of white LEDs of the same type.
  • the LED module 20 is formed in an elongated shape so as to extend in the long side direction (X direction) of the backlight chassis 30, and intersects the X direction. A plurality are arranged in the direction (Y direction). In the LED module 20, a plurality of LEDs 22 are arranged at predetermined intervals in the extending direction (X direction) of the LED module 20.
  • the plurality of LEDs 22 are straight along the row direction (X direction). Are arranged in a shape. That is, a plurality of LEDs 22 are located on the two-dot chain line R indicating each row.
  • the interval between the LEDs 22 in each row is equal.
  • interval b (arrangement space
  • the luminance is lower than that at the central portion.
  • the center part center part of a short side direction (Y direction)
  • the number of LEDs 22 arranged in the long side direction is increased. That is, more LEDs 22 are arranged at the end (upper and lower ends) on the long side 31 side than at other locations.
  • the LED module 20 (20a) disposed at the end (upper and lower ends) of the backlight chassis 30 on the long side 31 side includes the LED module 20 (20b) disposed at the center of the backlight chassis 30. More LEDs 22 are mounted than in FIG. For this reason, the interval a1 of the LEDs 22 at the end (upper and lower ends) of the backlight chassis 30 on the long side 31 side is denser (smaller) than the interval a2 of the LEDs 22 at the center of the backlight chassis 30. .
  • the luminance is reduced by several to 10% at the edge of the screen.
  • the number of LEDs 22 arranged in the long side direction at the end portion (upper and lower ends) on the long side 31 side is larger than the central portion (the center portion in the short side direction (Y direction)) of the backlight chassis 30. It is preferable to increase it by several% to 10% (for example, about 5% to 10%).
  • each of the LEDs 22 arranged on the shortest side 32 side is arranged so that the distance from the side portion 30b is substantially the same. It is preferable.
  • the plurality of LEDs 22 are connected in series in the long side direction (X direction). Specifically, the LEDs 22 mounted on the LED module 20 (see FIG. 3) are connected in series for each LED module 20. Moreover, as above-mentioned, several LED22 consists of the same type white LED, and the forward current of each LED22 is set so that it may become substantially the same. More specifically, the plurality of LEDs 22 mounted on the backlight unit 50 have substantially the same drive current between the LEDs 22 arranged at the upper and lower ends and the LEDs 22 arranged at other than the upper and lower ends. Is set to
  • the backlight unit 50 includes an LED driver 60 for driving the LEDs 22.
  • a plurality of LEDs 22 connected in series for each row are connected to the LED driver 60. Yes.
  • the LED driver 60 is an example of the “light source control unit” in the present invention.
  • an LED package 122 in which a blue light emitting LED chip 122a is sealed with a sealing resin 122b containing a phosphor (not shown) is used. be able to.
  • the LED chips 122a are preferably connected in series as shown in FIG.
  • the reflection sheet 40 (see FIG. 1) included in the backlight unit 50 is formed by, for example, processing a resin sheet member, and includes a plurality of hole portions 41a whose opening shape in a plan view is substantially circular. And a side portion 42 provided on the outer periphery of the bottom portion 41. Moreover, the hole 41a of the reflection sheet 40 is formed so as to correspond to the LEDs 22 arranged two-dimensionally.
  • the reflection sheet 40 is housed in the housing area of the backlight chassis 30 together with the LED module 20 such that a part of the LED 22 protrudes from the hole 41 a.
  • the bottom surface 30 c of the backlight chassis 30 and the mounting surface 21 a of the mounting substrate 21 are covered by the bottom 41 of the reflection sheet 40, and the inner side surface of the backlight chassis 30 is covered by the side 42 of the reflection sheet 40.
  • the diffusion plate 45 is an optical sheet that overlaps the LED module 20 and diffuses light emitted from the LED module 20 (LED 22). That is, the diffusion plate 45 diffuses the light from the LEDs 22 and spreads the light over the entire area of the liquid crystal display panel 10.
  • the prism sheet 46 is an optical sheet that overlaps the diffusion plate 45.
  • this prism sheet 46 for example, triangular prisms extending in one direction (linearly) are arranged in a direction intersecting with one direction in the sheet surface, and the radiation characteristic of light from the diffusion plate 45 is deflected.
  • the lens sheet 47 is an optical sheet that overlaps the prism sheet 46.
  • fine particles that refract and scatter light are dispersed in the lens sheet 47, and the light from the prism sheet 46 is not collected locally, and the difference in brightness (light intensity unevenness) is suppressed.
  • the light distribution distribution (Light distribution characteristic: Refer to the dashed-dotted line of FIG. 4) of each LED22 is also substantially the same. . Therefore, in the backlight unit 50 of the first embodiment, the distance from the LED 22 to the diffusion plate 45 is also constant.
  • the backlight unit 50 forms planar light by superimposing light from the plurality of LEDs 22 (LED modules 20), and the planar light is converted into a plurality of optical members 45. To 47 and supplied to the liquid crystal display panel 10. Thereby, the non-light-emitting liquid crystal display panel 10 receives the light (backlight light) from the backlight unit 50 and improves the display function.
  • the long side 31 side is arranged.
  • the brightness at the end can be increased. Thereby, since the fall of the brightness
  • the end portion on the long side 31 side is longer than the end portion on the short side 32 side, at least the luminance of each end portion on the long side 31 side is increased, thereby effectively improving the luminance uniformity. be able to.
  • the same LED driver 60 power supply
  • the LED 22 can be driven. That is, since the brightness is increased by increasing the number of LEDs 22 at the upper and lower ends of the backlight chassis 30, the same LED driver 60 is used by setting each LED 22 to have substantially the same forward current. Can do. For this reason, while being able to simplify the structure of the backlight unit 50, since it is not necessary to use several types of LED drivers, it can manufacture at low cost.
  • the configuration of the backlight unit 50 can be simplified by connecting a plurality of LEDs 22 in series in the long side direction (X direction: horizontal direction of the screen). Moreover, the number of LED drivers 60 can be reduced by connecting a plurality of LEDs 22 in series. Furthermore, the current variation of the LEDs 22 connected in series can be reduced. In addition, the forward voltage variation (total voltage variation) of the LED 22 can be reduced. As a result, a high-quality backlight unit capable of improving luminance uniformity can be obtained at low cost.
  • the liquid crystal display device 100 including the upper and lower ends of the screen and having uniform luminance can be obtained.
  • FIG. 9 is a diagram for explaining a backlight unit according to a modification of the first embodiment.
  • a backlight unit according to a modification of the first embodiment will be described with reference to FIG.
  • corresponding components are denoted by the same reference numerals, and redundant description is omitted as appropriate.
  • positioned at the upper and lower ends of the backlight chassis 30 becomes a voltage different from the LED group (LED module 20 arrange
  • the LED module 20 including the first LED driver 161 and the second LED driver 162 and disposed at the upper and lower ends of the backlight chassis 30 is the first LED driver 161.
  • the LED module 20 arranged at a position other than the upper and lower ends is configured to control the drive by the second LED driver 162.
  • the first LED driver 161 is an example of the “first light source control unit” in the present invention
  • the second LED driver 162 is an example of the “second light source control unit” in the present invention.
  • FIG. 10 is a plan view illustrating a part of the backlight unit according to the second embodiment of the present invention.
  • FIG. 11 and FIG. 12 are diagrams showing an example of a high-intensity LED mounted on the backlight unit according to the second embodiment of the present invention.
  • a backlight unit according to a second embodiment of the present invention will be described with reference to FIG. 7 and FIGS.
  • symbol is attached
  • each LED module 20 on the shortest side 32 side (long side direction (X direction): left and right ends)
  • LEDs 122 having higher luminance than other LEDs 22 (for example, LEDs 22 arranged in the center) are arranged.
  • An LED package (white LED) on which a larger number of LED chips are mounted than the other LEDs 22 is used for the LEDs 222 (high-brightness LEDs) arranged at the end (left and right ends) on the short side 32 side of the backlight chassis 30. be able to.
  • the LED 222 (high-brightness LED) is sealed with a larger number of LED chips 122a similar to the LED chip 122a shown in FIG. 7 and a phosphor (not shown).
  • An LED package 222a (222) sealed with a resin 122b can be used.
  • Each LED chip 122a is preferably connected in series as shown in FIG.
  • luminance is used for LED arrange
  • the luminance can be increased not only at the end (upper and lower ends) on the long side 31 side but also at the end (left and right ends) on the short side 32 side.
  • luminance uniformity can be improved more.
  • the brightness of the end portion (left and right ends) on the short side 32 side of the backlight chassis 30 is set to be higher by about several to 10% (for example, about 5% to 10%) than the central portion. Preferably it is done.
  • FIG. 13 is a plan view illustrating a part of the backlight unit according to the third embodiment of the present invention.
  • FIG. 14 is a schematic diagram illustrating a connection state of LEDs of the backlight unit according to the third embodiment of the present invention.
  • a backlight unit according to a third embodiment of the present invention will be described with reference to FIGS.
  • symbol is attached
  • the central portion (long side direction (X direction)) of the backlight chassis 30 at the end portion (left and right ends) on the short side 32 side of the backlight chassis 30, the central portion (long side direction (X direction)) of the backlight chassis 30.
  • the number of LEDs 22 arranged in the short side direction is larger than that in the central portion of FIG.
  • an LED module 20 (20c) extending in the short side direction (Y direction) is further arranged at the end (left and right ends) of the backlight chassis 30 on the short side 32 side.
  • a larger number of LEDs 22 than the number of LEDs 22 arranged in the short side direction (Y direction) in the central portion are arranged at a predetermined interval (for example, at equal intervals).
  • the number of LED22 arranged in a short side direction is several. It is preferable to increase by about 10% to 10% (for example, about 5% to 10%).
  • LED22 mounted in the said LED module 20 (LED module 20c arrange
  • a plurality of LEDs 22 are connected in series in the short side direction (Y direction) at the end (left and right ends) on the short side 32 side. That is, in the LED module 20 (20c) arranged at the end (left and right ends) on the short side 32 side, a plurality of LEDs 22 mounted on the LED module 20 (20c) are connected in series.
  • the end portion (upper and lower sides) on the long side 31 side is arranged.
  • the luminance can be increased not only at the end) but also at the end (left and right ends) on the short side 32 side.
  • each LED may be individually controlled.
  • the number of LED modules mounted and the number of LEDs mounted on the LED modules are not limited to the configuration shown in the above embodiment, and can be changed as appropriate.
  • a plurality of LEDs 22 can be connected in series for each row by electrically connecting the LED modules 20 adjacent in the long side direction (X direction) with a connector (not shown).
  • a plurality of LEDs are configured from white LEDs of the same type.
  • the present invention is not limited to this, and, for example, is different for some of the plurality of LEDs.
  • a type of LED may be used.
  • the present invention is not limited to this example. You may comprise so that the number of LED may increase in steps as it goes to the edge part side from the center part of a light chassis.
  • the backlight chassis is shown as an example of a substrate on which a plurality of LEDs are arranged.
  • the present invention is not limited to this, and a plurality of LEDs are mounted on a substrate other than the backlight chassis. You may arrange.
  • a plurality of LEDs may be two-dimensionally arranged on the surface of the plate member. In this case, the LED can be accommodated in the backlight chassis in a state of being arranged on the plate-like member.
  • the type of LED is not particularly limited.
  • the LED may include a blue light emitting LED chip (light emitting chip) and a phosphor that receives light from the LED chip and fluoresces yellow light.
  • a blue light emitting LED chip light emitting chip
  • a phosphor that receives light from the LED chip and fluoresces yellow light.
  • Such an LED generates white light using light from a blue light emitting LED chip and light emitted from a fluorescent light.
  • the number of LED chips included in the LED is not particularly limited.
  • the phosphor incorporated in the LED is not limited to a phosphor that emits yellow light.
  • an LED includes a blue light emitting LED chip and a phosphor that emits green light and red light in response to light from the LED chip, and emits blue light and fluorescent light (green light) from the LED chip. , Red light) and white light can be used.
  • the LED chip built in the LED is not limited to the one emitting blue light.
  • the LED may include a red LED chip that emits red light, a blue LED chip that emits blue light, and a phosphor that emits green light by receiving light from the blue LED chip. With such an LED, white light can be generated by red light from the red LED chip, blue light from the blue LED chip, and green light that fluoresces.
  • the LED may be an LED that does not contain any phosphor.
  • a red LED chip that emits red light, a green LED chip that emits green light, and a blue LED chip that emits blue light are configured to generate white light by mixing light from all LED chips. Also good.
  • an LED package in which a plurality of LED chips are connected in series is shown as an example of an LED.
  • an LED package in which a plurality of LED chips are connected in parallel can also be used. is there.
  • the backlight unit includes the diffuser plate, the prism sheet, and the lens sheet as the optical member (optical sheet).
  • the optical member optical sheet
  • the optical member optical sheet
  • the optical member can be appropriately changed (added or deleted) as necessary.
  • the present invention is not limited to this, and is for supplying light to the display panel.
  • the present invention can be applied to all non-light emitting display devices including a backlight unit.
  • Liquid crystal display panel (display panel) DESCRIPTION OF SYMBOLS 11 Active matrix board

Abstract

Provided is an illumination device capable of improving brightness uniformity by suppressing a decrease in brightness in end sections. This backlight unit (illumination device) (50) is provided with a plurality of LEDs (22) and a backlight chassis (30) on which the LEDs (22) are arranged in two dimensions. The backlight chassis (30), when seen in a plan view, is formed into a substantially rectangular shape having a pair of long sides (31) and a pair of short sides (32), and more of the LEDs (22) are arranged at least in the end sections (top and bottom ends) at the long sides (31) than in the center section of the backlight chassis (30).

Description

照明装置および表示装置Illumination device and display device
 本発明は、照明装置および表示装置に関し、特に、二次元状に光源が配置された照明装置およびその照明装置を備えた表示装置に関する。 The present invention relates to a lighting device and a display device, and more particularly to a lighting device in which light sources are two-dimensionally arranged and a display device including the lighting device.
 非発光型の液晶表示パネル(表示パネル)を搭載する液晶表示装置(表示装置)では、通常、その液晶表示パネルに対して、光を供給するバックライトユニット(照明装置)も搭載される。バックライトユニットは、面状の液晶表示パネル全域に対して行き渡るような面状光を生成するように構成されているのが好ましい。 In a liquid crystal display device (display device) equipped with a non-light emitting liquid crystal display panel (display panel), a backlight unit (illumination device) for supplying light is usually mounted on the liquid crystal display panel. The backlight unit is preferably configured to generate planar light that spreads over the entire area of the planar liquid crystal display panel.
 また、従来、液晶表示パネルに光を供給するバックライトユニットとして、直下型のバックライトユニットが知られている。 Conventionally, a direct backlight unit is known as a backlight unit for supplying light to a liquid crystal display panel.
 直下型のバックライトユニットは、拡散板の下部に、光源となるLED(Light Emitting Diode:発光ダイオード)を複数配置した構成を有している。そして、複数のLEDからの光を拡散板によって拡散して外部に放出するように構成されている。なお、このような直下型のバックライトユニットの一例が特許文献1に記載されている。 The direct type backlight unit has a configuration in which a plurality of LEDs (Light Emitting Diodes) serving as a light source are arranged below the diffusion plate. And it is comprised so that the light from several LED may be spread | diffused with a diffusion plate, and it discharge | releases outside. An example of such a direct type backlight unit is described in Patent Document 1.
特開2008-304502号公報JP 2008-304502 A
 また、近年、バックライトユニットを搭載した表示装置は、種々の用途に用いられることが多くなってきており、用途によっては、画面の端まで均一な輝度が要求される場合がある。たとえば、医療用のモニタなどでは、画面の端部分にも重要な画像が表示される場合があるため、画面の端まで均一な輝度が要求される。 In recent years, display devices equipped with a backlight unit have been increasingly used for various applications, and depending on the application, uniform brightness may be required up to the edge of the screen. For example, in a medical monitor or the like, an important image may be displayed on the end portion of the screen, so that uniform brightness is required up to the end of the screen.
 しかしながら、従来の直下型バックライトユニットでは、画面の端部分で輝度が低下するという不都合がある。そのため、輝度の均一性を向上させることが困難であるという問題点がある。 However, the conventional direct type backlight unit has a disadvantage that the luminance is lowered at the edge of the screen. Therefore, there is a problem that it is difficult to improve luminance uniformity.
 この発明は、上記のような課題を解決するためになされたものであり、この発明の1つの目的は、端部での輝度低下を抑制することにより、輝度均一性を向上させることが可能な照明装置およびその照明装置を搭載した表示装置を提供することである。 The present invention has been made to solve the above-described problems, and one object of the present invention is to improve luminance uniformity by suppressing luminance reduction at the end. An illumination device and a display device equipped with the illumination device are provided.
 上記目的を達成するために、この発明の第1の局面による照明装置は、複数の光源と、上記複数の光源が二次元状に配置される基体とを備えている。そして、上記基体は、平面的に見て、一対の長辺と一対の短辺とを有する略矩形形状に形成されており、少なくとも、長辺側の端部の各々には、上記光源が、基体の中央部よりも多く配置されている。 In order to achieve the above object, an illumination apparatus according to a first aspect of the present invention includes a plurality of light sources and a base on which the plurality of light sources are two-dimensionally arranged. The substrate is formed in a substantially rectangular shape having a pair of long sides and a pair of short sides when seen in a plan view, and at least each of the end portions on the long side has the light source, More than the central part of the substrate are arranged.
 この第1の局面による照明装置では、上記のように、少なくとも、長辺側の端部の各々に基体の中央部よりも多くの光源を配置することによって、長辺側の端部における輝度を高めることができる。これにより、端部における輝度の低下を抑制することができるので、輝度均一性を向上させることができる。 In the illuminating device according to the first aspect, as described above, the luminance at the end portion on the long side is increased by disposing more light sources than the central portion of the base at each end portion on the long side. Can be increased. Thereby, since the fall of the brightness | luminance in an edge part can be suppressed, brightness | luminance uniformity can be improved.
 また、長辺側の端部は短辺側の端部よりも長いため、少なくとも、長辺側の端部の各々の輝度を高めることによって、効果的に、輝度均一性を向上させることができる。なお、長辺側の端部に配置する光源の数は、基体の中央部に配置する光源の数に対して、数%~10%程度多くするのが好ましい。 Further, since the end portion on the long side is longer than the end portion on the short side, it is possible to effectively improve the luminance uniformity by increasing the luminance of at least the end portions on the long side. . The number of light sources arranged at the end on the long side is preferably about several to 10% larger than the number of light sources arranged at the center of the base.
 上記第1の局面による照明装置において、複数の光源は、それぞれ、発光ダイオードからなり、発光ダイオードの順電流が、複数の光源の各々において、実質的に同じになるように設定されているのが好ましい。 In the illumination device according to the first aspect, each of the plurality of light sources includes a light emitting diode, and the forward current of the light emitting diode is set to be substantially the same in each of the plurality of light sources. preferable.
 この場合において、上記発光ダイオードは、白色発光ダイオードであるのが好ましい。 In this case, the light emitting diode is preferably a white light emitting diode.
 上記第1の局面による照明装置において、複数の光源は、長辺方向に、直列に接続されているのが好ましい。このように構成すれば、照明装置の構成を簡素化することができるので、輝度均一性を向上させることが可能な照明装置を安価に得ることができる。 In the illumination device according to the first aspect, the plurality of light sources are preferably connected in series in the long side direction. If comprised in this way, since the structure of an illuminating device can be simplified, the illuminating device which can improve a brightness | luminance uniformity can be obtained at low cost.
 上記第1の局面による照明装置において、好ましくは、複数の光源の駆動を制御する光源制御部をさらに備える。 The lighting device according to the first aspect preferably further includes a light source control unit that controls driving of a plurality of light sources.
 この場合において、光源制御部は、第1光源制御部と、第1光源制御部とは異なる第2光源制御部とを含んで構成されていてもよい。この場合、第1光源制御部は、長辺側の端部に配置された光源の駆動を制御するとともに、第2光源制御部は、基体の中央部に配置された光源の駆動を制御するように構成することができる。 In this case, the light source control unit may include a first light source control unit and a second light source control unit different from the first light source control unit. In this case, the first light source control unit controls the driving of the light source arranged at the end on the long side, and the second light source control unit controls the driving of the light source arranged at the center of the base. Can be configured.
 上記第1の局面による照明装置において、好ましくは、短辺側の端部の各々には、上記光源が、基体の中央部よりも多く配置されている。このように構成すれば、長辺側の端部のみならず、短辺側の端部においても、輝度を高めることができる。これにより、4つの端部の全てにおいて輝度の低下を抑制することができるので、輝度均一性をより向上させることができる。 In the illuminating device according to the first aspect, preferably, more light sources are arranged at each of the end portions on the short side than at the central portion of the base. If comprised in this way, a brightness | luminance can be raised not only at the edge part by the side of a long side but by the edge part by the side of a short side. Thereby, since the fall of a brightness | luminance can be suppressed in all the four edge parts, a brightness | luminance uniformity can be improved more.
 上記第1の局面による照明装置において、短辺側の端部に配置される光源が、基体の中央部に配置される光源に比べて輝度が高くなるように構成されていてもよい。このように構成すれば、短辺側の端部において輝度を高めることができるので、輝度均一性をより向上させることができる。 In the illumination device according to the first aspect, the light source disposed at the end portion on the short side may be configured to have higher luminance than the light source disposed at the center portion of the base. If comprised in this way, since a brightness | luminance can be raised in the edge part by the side of a short side, a brightness | luminance uniformity can be improved more.
 この発明の第2の局面による表示装置は、上記第1の局面による照明装置と、この照明装置からの光を受ける表示パネルとを備えている。このように構成すれば、容易に、端部での輝度低下が抑制された、輝度均一性が高い表示装置を得ることができる。 A display device according to a second aspect of the present invention includes the illumination device according to the first aspect and a display panel that receives light from the illumination device. If comprised in this way, the display apparatus with the high brightness uniformity which the brightness fall at the edge part was suppressed can be obtained easily.
 以上のように、本発明によれば、端部での輝度低下を抑制することにより、輝度均一性を向上させることが可能な照明装置およびその照明装置を搭載した表示装置を容易に得ることができる。 As described above, according to the present invention, it is possible to easily obtain an illuminating device capable of improving luminance uniformity and a display device equipped with the illuminating device by suppressing a decrease in luminance at the end. it can.
本発明の第1実施形態による液晶表示装置の分解斜視図である。1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention. 本発明の第1実施形態によるバックライトユニットの一部を示した平面図(バックライトユニットに用いられるLEDの配置状態を示した図)である。It is the top view (figure which showed the arrangement state of LED used for a backlight unit) which showed a part of backlight unit by a 1st embodiment of the present invention. 本発明の第1実施形態によるバックライトユニットの一部を示した平面図である。It is the top view which showed a part of backlight unit by 1st Embodiment of this invention. 本発明の第1実施形態によるバックライトユニット(液晶表示装置)の断面図(図2のA-A線に沿った断面に対応する図)である。FIG. 3 is a cross-sectional view of the backlight unit (liquid crystal display device) according to the first embodiment of the present invention (a view corresponding to a cross section taken along the line AA in FIG. 2). 本発明の第1実施形態によるバックライトユニットのLEDの接続状態を示した模式図である。It is the schematic diagram which showed the connection state of LED of the backlight unit by 1st Embodiment of this invention. 本発明の第1実施形態によるバックライトユニットのLEDの接続状態を示した回路図である。It is the circuit diagram which showed the connection state of LED of the backlight unit by 1st Embodiment of this invention. 本発明の第1実施形態によるバックライトユニットに用いられるLEDパッケージの一例を示した平面図である。It is the top view which showed an example of the LED package used for the backlight unit by 1st Embodiment of this invention. 本発明の第1実施形態によるバックライトユニットに用いられるLEDパッケージの一例を示した等価回路図である。It is the equivalent circuit schematic which showed an example of the LED package used for the backlight unit by 1st Embodiment of this invention. 第1実施形態の変形例によるバックライトユニットを説明するための図である。It is a figure for demonstrating the backlight unit by the modification of 1st Embodiment. 本発明の第2実施形態によるバックライトユニットの一部を示した平面図である。It is the top view which showed a part of backlight unit by 2nd Embodiment of this invention. 本発明の第2実施形態によるバックライトユニットに搭載される高輝度LEDの一例を示した平面図である。It is the top view which showed an example of the high-intensity LED mounted in the backlight unit by 2nd Embodiment of this invention. 本発明の第2実施形態によるバックライトユニットに搭載される高輝度LEDの一例を示した等価回路図である。It is the equivalent circuit schematic which showed an example of high-intensity LED mounted in the backlight unit by 2nd Embodiment of this invention. 本発明の第3実施形態によるバックライトユニットの一部を示した平面図である。It is the top view which showed a part of backlight unit by 3rd Embodiment of this invention. 本発明の第3実施形態によるバックライトユニットのLEDの接続状態を示した模式図である。It is the schematic diagram which showed the connection state of LED of the backlight unit by 3rd Embodiment of this invention. 本発明の変形例によるバックライトユニットの一部を示した平面図である。It is the top view which showed a part of backlight unit by the modification of this invention.
 以下、本発明を具体化した実施形態を図面に基づいて詳細に説明する。 DETAILED DESCRIPTION Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings.
 (第1実施形態)
 図1は、本発明の第1実施形態による液晶表示装置の分解斜視図である。図2および図3は、本発明の第1実施形態によるバックライトユニットの一部を示した平面図である。図4~図8は、本発明の第1実施形態によるバックライトユニットを説明するための図である。なお、図2では、バックライトユニットに用いられるLEDの配置状態を示している。まず、図1~図8を参照して、本発明の第1実施形態によるバックライトユニットおよびそのバックライトユニットを備えた液晶表示装置について説明する。
(First embodiment)
FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention. 2 and 3 are plan views showing a part of the backlight unit according to the first embodiment of the present invention. 4 to 8 are diagrams for explaining the backlight unit according to the first embodiment of the present invention. In addition, in FIG. 2, the arrangement | positioning state of LED used for a backlight unit is shown. First, a backlight unit according to a first embodiment of the present invention and a liquid crystal display device including the backlight unit will be described with reference to FIGS.
 第1実施形態による液晶表示装置100は、図1に示すように、液晶表示パネル10と、この液晶表示パネル10に対して光を供給するバックライトユニット50と、これらを挟んで互いに対向する一対のハウジング70(表ハウジング71、裏ハウジング72)とを備えている。なお、液晶表示装置100は、本発明の「表示装置」の一例であり、液晶表示パネル10は、本発明の「表示パネル」の一例である。また、バックライトユニット50は、本発明の「照明装置」の一例である。 As shown in FIG. 1, the liquid crystal display device 100 according to the first embodiment includes a liquid crystal display panel 10, a backlight unit 50 that supplies light to the liquid crystal display panel 10, and a pair facing each other with these interposed therebetween. Housing 70 (front housing 71, back housing 72). The liquid crystal display device 100 is an example of the “display device” in the present invention, and the liquid crystal display panel 10 is an example of the “display panel” in the present invention. The backlight unit 50 is an example of the “lighting device” in the present invention.
 液晶表示パネル10は、たとえば、TFT(Thin Film Transistor)などのスイッチング素子を含むアクティブマトリックス基板11と、このアクティブマトリックス基板11に対向する対向基板12とをシール材(図示せず)で貼り合わせることによって構成されている。また、両基板11および12の隙間には、液晶(図示せず)が注入されている。そして、アクティブマトリックス基板11の受光面側および対向基板12の出射面側には、それぞれ、偏光フィルム13が取り付けられている。 In the liquid crystal display panel 10, for example, an active matrix substrate 11 including a switching element such as a TFT (Thin Film Transistor) and an opposite substrate 12 facing the active matrix substrate 11 are bonded to each other with a sealing material (not shown). It is constituted by. A liquid crystal (not shown) is injected into the gap between the substrates 11 and 12. A polarizing film 13 is attached to each of the light receiving surface side of the active matrix substrate 11 and the light emitting surface side of the counter substrate 12.
 このように構成された液晶表示パネル10は、液晶分子の傾きに起因する透過率の変化を利用して、画像を表示する。 The liquid crystal display panel 10 configured in this manner displays an image by using a change in transmittance caused by the tilt of liquid crystal molecules.
 また、第1実施形態によるバックライトユニット50は、直下型のバックライトユニットであり、LEDモジュール20、バックライトシャーシ30、反射シート40、拡散板45、プリズムシート46、および、レンズシート47を有している。なお、上記バックライトユニット50は、液晶表示パネル10の直下に配置されている。 The backlight unit 50 according to the first embodiment is a direct-type backlight unit, and includes the LED module 20, the backlight chassis 30, the reflection sheet 40, the diffusion plate 45, the prism sheet 46, and the lens sheet 47. is doing. The backlight unit 50 is disposed directly below the liquid crystal display panel 10.
 バックライトシャーシ30は、液晶表示パネル10側が開口された略箱状の部材であり、底部30aと、その底部30aの外周に設けられた側部30bとを有している。このバックライトシャーシ30は、たとえば、金属製の板状部材を加工することによって形成されており、その底面30cにLEDモジュール20および反射シート40を敷き詰めることで、これらを収容する。また、バックライトシャーシ30の側部30bで囲まれた領域は略長方形形状(略矩形形状)となっており、その略長方形形状の領域が、LEDモジュール20および反射シート40を収容する収容領域とされている。 The backlight chassis 30 is a substantially box-shaped member opened on the liquid crystal display panel 10 side, and has a bottom portion 30a and a side portion 30b provided on the outer periphery of the bottom portion 30a. The backlight chassis 30 is formed, for example, by processing a metal plate-like member, and accommodates them by spreading the LED module 20 and the reflection sheet 40 on the bottom surface 30c. Moreover, the area | region enclosed by the side part 30b of the backlight chassis 30 becomes substantially rectangular shape (substantially rectangular shape), and the area | region of the substantially rectangular shape is the accommodation area | region which accommodates the LED module 20 and the reflective sheet 40, and Has been.
 また、図1~図3に示すように、バックライトシャーシ30は、略長方形形状に形成されているため、平面的に見て、一対の長辺31と一対の短辺32とを有している。なお、バックライトシャーシ30は、本発明の「基体」の一例である。 1 to 3, the backlight chassis 30 is formed in a substantially rectangular shape, and therefore has a pair of long sides 31 and a pair of short sides 32 in plan view. Yes. The backlight chassis 30 is an example of the “base” in the present invention.
 バックライトユニット50を構成するLEDモジュール20は、光を発するモジュールであり、実装基板21と、この実装基板21の実装面21a上に実装される、光源としてのLED22とを含む。 The LED module 20 constituting the backlight unit 50 is a module that emits light, and includes a mounting substrate 21 and an LED 22 as a light source mounted on the mounting surface 21a of the mounting substrate 21.
 実装基板21は、板状かつ矩形状の基板であり、実装面21a上に、複数の電極(図示せず)が配列されている。そして、これらの電極上に、上記LED22が取り付けられている。 The mounting substrate 21 is a plate-like and rectangular substrate, and a plurality of electrodes (not shown) are arranged on the mounting surface 21a. And said LED22 is attached on these electrodes.
 LED22は、実装基板21における実装面21aに形成された電極(図示せず)に実装されることで電流の供給を受けて光を発する。また、図2に示すように、光源としてのLED22は、バックライトシャーシ30の収容領域に、複数個搭載されている。これら複数のLED22は、それぞれ、白色LED(白色発光ダイオード)から構成されており、バックライトシャーシ30の収容領域(バックライトシャーシ30の底面30c上)に、二次元状に配置されている。 The LED 22 is mounted on an electrode (not shown) formed on the mounting surface 21a of the mounting substrate 21 so as to receive light and emit light. In addition, as shown in FIG. 2, a plurality of LEDs 22 as light sources are mounted in the accommodation area of the backlight chassis 30. Each of the plurality of LEDs 22 is composed of a white LED (white light emitting diode), and is two-dimensionally arranged in the accommodation region of the backlight chassis 30 (on the bottom surface 30c of the backlight chassis 30).
 また、上記複数のLED22には、同タイプの白色LEDが用いられている。すなわち、第1実施形態によるバックライトユニット50には、同タイプの白色LEDが複数個搭載されている。 Further, the same type of white LED is used for the plurality of LEDs 22. That is, the backlight unit 50 according to the first embodiment includes a plurality of white LEDs of the same type.
 また、図2および図3に示すように、上記LEDモジュール20が、バックライトシャーシ30の長辺方向(X方向)に延びるように細長状に形成されているとともに、X方向に対して交差する方向(Y方向)に複数配列されている。また、LEDモジュール20には、複数のLED22が、LEDモジュール20の延び方向(X方向)に所定の間隔で配列されている。 2 and 3, the LED module 20 is formed in an elongated shape so as to extend in the long side direction (X direction) of the backlight chassis 30, and intersects the X direction. A plurality are arranged in the direction (Y direction). In the LED module 20, a plurality of LEDs 22 are arranged at predetermined intervals in the extending direction (X direction) of the LED module 20.
 具体的には、図2に示すように、バックライトシャーシ30の長辺方向(X方向)と平行な方向を行方向とした場合に、複数のLED22が行方向(X方向)に沿って直線状に配列されている。すなわち、各行を示す二点鎖線R上に、複数のLED22が位置している。なお、第1実施形態では、LED22に同タイプの白色LEDを用いているため、各行におけるLED22の間隔(各LEDモジュール20のLED22の間隔)は等間隔となっているのが好ましい。また、短辺方向(Y方向)におけるLED22の間隔b(LEDモジュール20(図3参照)のY方向の配置間隔)も等間隔となっているのが好ましい。 Specifically, as shown in FIG. 2, when the direction parallel to the long side direction (X direction) of the backlight chassis 30 is the row direction, the plurality of LEDs 22 are straight along the row direction (X direction). Are arranged in a shape. That is, a plurality of LEDs 22 are located on the two-dot chain line R indicating each row. In the first embodiment, since the white LED of the same type is used as the LED 22, it is preferable that the interval between the LEDs 22 in each row (the interval between the LEDs 22 in each LED module 20) is equal. Moreover, it is preferable that the space | interval b (arrangement space | interval of the Y direction of LED module 20 (refer FIG. 3)) of LED22 in a short side direction (Y direction) is also equal intervals.
 ここで、バックライトシャーシ30の端部(たとえば、上下端)では、側部30b側から光が供給されないため、中央部に比べて輝度が低下する。このため、第1実施形態では、バックライトシャーシ30の長辺31側の端部(上下端)において、バックライトシャーシ30の中央部(短辺方向(Y方向)の中央部)に比べて、長辺方向に配列されたLED22の数を多くしている。すなわち、長辺31側の端部(上下端)には、その他の箇所に比べて、多くのLED22が配置されている。具体的には、バックライトシャーシ30の長辺31側の端部(上下端)に配置されるLEDモジュール20(20a)には、バックライトシャーシ30の中央部に配置されるLEDモジュール20(20b)に比べて、多くのLED22が実装されている。このため、バックライトシャーシ30の長辺31側の端部(上下端)におけるLED22の間隔a1は、バックライトシャーシ30の中央部におけるLED22の間隔a2に比べて、密に(小さく)なっている。 Here, since light is not supplied from the side portion 30b side at the end portion (for example, the upper and lower ends) of the backlight chassis 30, the luminance is lower than that at the central portion. For this reason, in 1st Embodiment, compared with the center part (center part of a short side direction (Y direction)) in the edge part (upper-lower end) of the long side 31 side of the backlight chassis 30, The number of LEDs 22 arranged in the long side direction is increased. That is, more LEDs 22 are arranged at the end (upper and lower ends) on the long side 31 side than at other locations. More specifically, the LED module 20 (20a) disposed at the end (upper and lower ends) of the backlight chassis 30 on the long side 31 side includes the LED module 20 (20b) disposed at the center of the backlight chassis 30. More LEDs 22 are mounted than in FIG. For this reason, the interval a1 of the LEDs 22 at the end (upper and lower ends) of the backlight chassis 30 on the long side 31 side is denser (smaller) than the interval a2 of the LEDs 22 at the center of the backlight chassis 30. .
 本願発明者の検討によれば、画面の端部では、輝度が数%~10%程度低下する。このため、長辺31側の端部(上下端)では、バックライトシャーシ30の中央部(短辺方向(Y方向)の中央部)に比べて、長辺方向に配列するLED22の数を、数%~10%程度(たとえば、5%~10%程度)増加させるのが好ましい。 According to the study of the present inventor, the luminance is reduced by several to 10% at the edge of the screen. For this reason, the number of LEDs 22 arranged in the long side direction at the end portion (upper and lower ends) on the long side 31 side is larger than the central portion (the center portion in the short side direction (Y direction)) of the backlight chassis 30. It is preferable to increase it by several% to 10% (for example, about 5% to 10%).
 なお、上述したように、長辺31側の端部(上下端)に配置された複数のLED22の種類(輝度等の特性)は、それぞれ、上下端以外に配置されたLED22と同様である。また、図2および図3に示すように、各行(各LEDモジュール20)において、最も短辺32側に配置されるLED22の各々は、側部30bからの距離が略同じになるように配置されているのが好ましい。 As described above, the types (characteristics such as luminance) of the plurality of LEDs 22 arranged at the end (upper and lower ends) on the long side 31 side are the same as those of the LEDs 22 arranged other than the upper and lower ends. As shown in FIGS. 2 and 3, in each row (each LED module 20), each of the LEDs 22 arranged on the shortest side 32 side is arranged so that the distance from the side portion 30b is substantially the same. It is preferable.
 また、第1実施形態では、図5および図6に示すように、複数のLED22は、長辺方向(X方向)に直列接続されている。具体的には、LEDモジュール20(図3参照)に実装されたLED22は、LEDモジュール20毎に直列接続されている。また、上記のように、複数のLED22は同タイプの白色LEDからなり、また、各LED22の順電流は、実質的に同じになるように設定されている。より具体的には、バックライトユニット50に搭載される複数のLED22は、その駆動電流が、上下端に配置されるLED22と、上下端以外に配置されるLED22とで実質的に同じになるように設定されている。 In the first embodiment, as shown in FIGS. 5 and 6, the plurality of LEDs 22 are connected in series in the long side direction (X direction). Specifically, the LEDs 22 mounted on the LED module 20 (see FIG. 3) are connected in series for each LED module 20. Moreover, as above-mentioned, several LED22 consists of the same type white LED, and the forward current of each LED22 is set so that it may become substantially the same. More specifically, the plurality of LEDs 22 mounted on the backlight unit 50 have substantially the same drive current between the LEDs 22 arranged at the upper and lower ends and the LEDs 22 arranged at other than the upper and lower ends. Is set to
 また、上記バックライトユニット50は、図6に示すように、LED22を駆動するためのLEDドライバ60を備えており、行毎に直列接続された複数のLED22が、このLEDドライバ60に接続されている。なお、LEDドライバ60は、本発明の「光源制御部」の一例である。 Further, as shown in FIG. 6, the backlight unit 50 includes an LED driver 60 for driving the LEDs 22. A plurality of LEDs 22 connected in series for each row are connected to the LED driver 60. Yes. The LED driver 60 is an example of the “light source control unit” in the present invention.
 また、図7に示すように、上記LED22(白色LED)には、たとえば、青色発光のLEDチップ122aを、蛍光体(図示せず)入りの封止樹脂122bで封止したLEDパッケージ122を用いることができる。また、LEDパッケージ122にLEDチップ122aが複数個実装されている場合、各LEDチップ122aは、図8に示すように、直列接続されているのが好ましい。 Further, as shown in FIG. 7, for the LED 22 (white LED), for example, an LED package 122 in which a blue light emitting LED chip 122a is sealed with a sealing resin 122b containing a phosphor (not shown) is used. be able to. When a plurality of LED chips 122a are mounted on the LED package 122, the LED chips 122a are preferably connected in series as shown in FIG.
 バックライトユニット50に含まれる反射シート40(図1参照)は、たとえば、樹脂製のシート部材を加工することによって形成されており、平面視における開口形状が略円形状である穴部41aを複数持つ底部41と、この底部41の外周に設けられた側部42とを有している。また、反射シート40の穴部41aは、二次元状に配置されたLED22と対応するように形成されている。 The reflection sheet 40 (see FIG. 1) included in the backlight unit 50 is formed by, for example, processing a resin sheet member, and includes a plurality of hole portions 41a whose opening shape in a plan view is substantially circular. And a side portion 42 provided on the outer periphery of the bottom portion 41. Moreover, the hole 41a of the reflection sheet 40 is formed so as to correspond to the LEDs 22 arranged two-dimensionally.
 そして、上記反射シート40は、図1および図4に示すように、LED22の一部が穴部41aから突出するようにして、LEDモジュール20とともにバックライトシャーシ30の収容領域に収容されている。これにより、バックライトシャーシ30の底面30cおよび実装基板21の実装面21aが反射シート40の底部41によって覆われ、バックライトシャーシ30の内側面が反射シート40の側部42によって覆われる。このように、上記反射シート40をバックライトユニット50に設けることによって、反射シート40で光の反射が行われるため、液晶表示パネル10側に進行する光が増大する。そのため、光の利用効率が向上する。 As shown in FIGS. 1 and 4, the reflection sheet 40 is housed in the housing area of the backlight chassis 30 together with the LED module 20 such that a part of the LED 22 protrudes from the hole 41 a. As a result, the bottom surface 30 c of the backlight chassis 30 and the mounting surface 21 a of the mounting substrate 21 are covered by the bottom 41 of the reflection sheet 40, and the inner side surface of the backlight chassis 30 is covered by the side 42 of the reflection sheet 40. Thus, by providing the reflection sheet 40 in the backlight unit 50, light is reflected by the reflection sheet 40, so that the light traveling toward the liquid crystal display panel 10 side increases. Therefore, the light use efficiency is improved.
 拡散板45は、LEDモジュール20に重なる光学シートであり、LEDモジュール20(LED22)から発せられる光を拡散させる。すなわち、拡散板45は、LED22からの光を拡散させて、液晶表示パネル10の全域に光を行き渡らせる。 The diffusion plate 45 is an optical sheet that overlaps the LED module 20 and diffuses light emitted from the LED module 20 (LED 22). That is, the diffusion plate 45 diffuses the light from the LEDs 22 and spreads the light over the entire area of the liquid crystal display panel 10.
 プリズムシート46は、拡散板45に重なる光学シートである。このプリズムシート46は、一方向(線状)に延びるたとえば三角プリズムが、シート面内にて、一方向に交差する方向に並べられており、拡散板45からの光の放射特性を偏向させる。 The prism sheet 46 is an optical sheet that overlaps the diffusion plate 45. In this prism sheet 46, for example, triangular prisms extending in one direction (linearly) are arranged in a direction intersecting with one direction in the sheet surface, and the radiation characteristic of light from the diffusion plate 45 is deflected.
 レンズシート47は、プリズムシート46に重なる光学シートである。このレンズシート47は、光を屈折散乱させる微粒子が内部に分散されており、プリズムシート46からの光を、局所的に集光させることなく、明暗差(光量ムラ)を抑える。 The lens sheet 47 is an optical sheet that overlaps the prism sheet 46. In the lens sheet 47, fine particles that refract and scatter light are dispersed in the lens sheet 47, and the light from the prism sheet 46 is not collected locally, and the difference in brightness (light intensity unevenness) is suppressed.
 なお、複数のLED22は、同タイプの白色LEDからなるため、図4に示すように、各LED22の配光分布(配光特性:図4の一点鎖線参照)も実質的に同じになっている。そのため、第1実施形態のバックライトユニット50においては、LED22から拡散板45までの距離も一定となっている。 In addition, since several LED22 consists of white LED of the same type, as shown in FIG. 4, the light distribution distribution (Light distribution characteristic: Refer to the dashed-dotted line of FIG. 4) of each LED22 is also substantially the same. . Therefore, in the backlight unit 50 of the first embodiment, the distance from the LED 22 to the diffusion plate 45 is also constant.
 上記のように構成された第1実施形態によるバックライトユニット50は、複数のLED22(LEDモジュール20)からの光を重ねることで面状光にし、その面状光を、複数枚の光学部材45~47に通過させて、液晶表示パネル10に供給する。これにより、非発光型の液晶表示パネル10は、バックライトユニット50からの光(バックライト光)を受光して表示機能を向上させる。 The backlight unit 50 according to the first embodiment configured as described above forms planar light by superimposing light from the plurality of LEDs 22 (LED modules 20), and the planar light is converted into a plurality of optical members 45. To 47 and supplied to the liquid crystal display panel 10. Thereby, the non-light-emitting liquid crystal display panel 10 receives the light (backlight light) from the backlight unit 50 and improves the display function.
 第1実施形態では、上記のように、バックライトシャーシ30における長辺31側の端部の各々に、バックライトシャーシ30の中央部よりも多くのLED22を配置することによって、長辺31側の端部における輝度を高めることができる。これにより、端部における輝度の低下を抑制することができるので、輝度均一性を向上させることができる。 In the first embodiment, as described above, by disposing more LEDs 22 than the central portion of the backlight chassis 30 at each end of the backlight chassis 30 on the long side 31 side, the long side 31 side is arranged. The brightness at the end can be increased. Thereby, since the fall of the brightness | luminance in an edge part can be suppressed, brightness | luminance uniformity can be improved.
 また、長辺31側の端部は短辺32側の端部よりも長いため、少なくとも、長辺31側の端部の各々の輝度を高めることによって、効果的に、輝度均一性を向上させることができる。 Further, since the end portion on the long side 31 side is longer than the end portion on the short side 32 side, at least the luminance of each end portion on the long side 31 side is increased, thereby effectively improving the luminance uniformity. be able to.
 また、第1実施形態では、複数のLED22を同タイプの白色LEDから構成することにより、その順電流が実質的に同じになるように設定することによって、同じLEDドライバ60(電源)を用いてLED22を駆動させることができる。すなわち、バックライトシャーシ30の上下端では、LED22の数を増やすことで輝度を高めているため、各LED22を実質的に同じ順電流となるように設定することにより、同じLEDドライバ60を用いることができる。このため、バックライトユニット50の構成をシンプルにすることができるとともに、複数種類のLEDドライバを用いなくてよいため、安価に製造することができる。 Further, in the first embodiment, by configuring the plurality of LEDs 22 from white LEDs of the same type and setting the forward currents to be substantially the same, the same LED driver 60 (power supply) is used. The LED 22 can be driven. That is, since the brightness is increased by increasing the number of LEDs 22 at the upper and lower ends of the backlight chassis 30, the same LED driver 60 is used by setting each LED 22 to have substantially the same forward current. Can do. For this reason, while being able to simplify the structure of the backlight unit 50, since it is not necessary to use several types of LED drivers, it can manufacture at low cost.
 また、第1実施形態では、複数のLED22を、長辺方向(X方向:画面の横方向)に、直列に接続することによって、バックライトユニット50の構成を簡素化することができる。また、複数のLED22を直列接続することにより、LEDドライバ60の数を少なくすることもできる。さらに、直列接続されたLED22の電流バラツキを低減することができる。加えて、LED22の順電圧のバラツキ(トータルの電圧バラツキ)を小さくすることもできる。これにより、輝度均一性を向上させることが可能な高品質なバックライトユニットを安価に得ることができる。 In the first embodiment, the configuration of the backlight unit 50 can be simplified by connecting a plurality of LEDs 22 in series in the long side direction (X direction: horizontal direction of the screen). Moreover, the number of LED drivers 60 can be reduced by connecting a plurality of LEDs 22 in series. Furthermore, the current variation of the LEDs 22 connected in series can be reduced. In addition, the forward voltage variation (total voltage variation) of the LED 22 can be reduced. As a result, a high-quality backlight unit capable of improving luminance uniformity can be obtained at low cost.
 さらに、複数のLED22を、長辺方向(X方向:画面の横方向)に、直列に接続することによって、たとえば、液晶表示パネル10の走査に同期して、行毎(LEDモジュール20毎)にLED22を点灯させることで、バックライトスキャンを行うこともできる。 Furthermore, by connecting a plurality of LEDs 22 in series in the long side direction (X direction: horizontal direction of the screen), for example, for each row (each LED module 20) in synchronization with scanning of the liquid crystal display panel 10. Backlight scanning can also be performed by turning on the LED 22.
 したがって、第1実施形態によるバックライトユニット50を用いて液晶表示装置を構成すれば、画面の上下端を含み輝度が均一化された液晶表示装置100を得ることができる。 Therefore, if the liquid crystal display device is configured using the backlight unit 50 according to the first embodiment, the liquid crystal display device 100 including the upper and lower ends of the screen and having uniform luminance can be obtained.
 (第1実施形態の変形例)
 図9は、第1実施形態の変形例によるバックライトユニットを説明するための図である。次に、図9を参照して、第1実施形態の変形例によるバックライトユニットについて説明する。なお、図9において、対応する構成要素には同一の符号を付すことにより、重複する説明は適宜省略する。
(Modification of the first embodiment)
FIG. 9 is a diagram for explaining a backlight unit according to a modification of the first embodiment. Next, a backlight unit according to a modification of the first embodiment will be described with reference to FIG. In FIG. 9, corresponding components are denoted by the same reference numerals, and redundant description is omitted as appropriate.
 バックライトシャーシ30の上下端に配置されるLEDモジュール20では、LED22の直列数が増えることで電圧が高くなる。このため、バックライトシャーシ30の上下端に配置されるLEDモジュール20は、他の箇所のLED群(上下端以外に配置されたLEDモジュール20)とは、異なる電圧となる。 In the LED modules 20 arranged at the upper and lower ends of the backlight chassis 30, the voltage increases as the number of LEDs 22 in series increases. For this reason, the LED module 20 arrange | positioned at the upper and lower ends of the backlight chassis 30 becomes a voltage different from the LED group (LED module 20 arrange | positioned other than the upper and lower ends) of another location.
 そのため、第1実施形態の変形例では、図9に示すように、第1LEDドライバ161および第2LEDドライバ162を備え、バックライトシャーシ30の上下端に配置されるLEDモジュール20は、第1LEDドライバ161で駆動を制御し、上下端以外に配置されたLEDモジュール20(中央部に配置されたLEDモジュール20)は、第2LEDドライバ162で駆動を制御するように構成されている。これにより、同じLEDドライバ(電源)で駆動する場合に比べて、損失を低減することができる。なお、第1LEDドライバ161は、本発明の「第1光源制御部」の一例であり、第2LEDドライバ162は、本発明の「第2光源制御部」の一例である。 Therefore, in the modification of the first embodiment, as shown in FIG. 9, the LED module 20 including the first LED driver 161 and the second LED driver 162 and disposed at the upper and lower ends of the backlight chassis 30 is the first LED driver 161. The LED module 20 arranged at a position other than the upper and lower ends (the LED module 20 arranged at the center) is configured to control the drive by the second LED driver 162. Thereby, compared with the case where it drives with the same LED driver (power supply), loss can be reduced. The first LED driver 161 is an example of the “first light source control unit” in the present invention, and the second LED driver 162 is an example of the “second light source control unit” in the present invention.
 また、第1実施形態の変形例のその他の構成および効果は、上記第1実施形態と同様である。 Further, other configurations and effects of the modified example of the first embodiment are the same as those of the first embodiment.
 (第2実施形態)
 図10は、本発明の第2実施形態によるバックライトユニットの一部を示した平面図である。図11および図12は、本発明の第2実施形態によるバックライトユニットに搭載される高輝度LEDの一例を示した図である。次に、図7および図10~図12を参照して、本発明の第2実施形態によるバックライトユニットについて説明する。なお、各図において、対応する構成要素には同一の符号を付すことにより、重複する説明は適宜省略する。
(Second Embodiment)
FIG. 10 is a plan view illustrating a part of the backlight unit according to the second embodiment of the present invention. FIG. 11 and FIG. 12 are diagrams showing an example of a high-intensity LED mounted on the backlight unit according to the second embodiment of the present invention. Next, a backlight unit according to a second embodiment of the present invention will be described with reference to FIG. 7 and FIGS. In addition, in each figure, the same code | symbol is attached | subjected to a corresponding component, and the overlapping description is abbreviate | omitted suitably.
 この第2実施形態では、図10に示すように、上記第1実施形態の構成において、各行(各LEDモジュール20)の最も短辺32側(長辺方向(X方向)の端部:左右端)には、他のLED22(たとえば、中央部に配置されるLED22)よりも輝度の高いLED122が配置されている。 In the second embodiment, as shown in FIG. 10, in the configuration of the first embodiment, the end of each row (each LED module 20) on the shortest side 32 side (long side direction (X direction): left and right ends) ), LEDs 122 having higher luminance than other LEDs 22 (for example, LEDs 22 arranged in the center) are arranged.
 バックライトシャーシ30の短辺32側の端部(左右端)に配置されるLED222(高輝度LED)には、他のLED22よりも多数のLEDチップが実装されたLEDパッケージ(白色LED)を用いることができる。たとえば、図11に示すように、上記LED222(高輝度LED)には、図7で示したLEDチップ122aと同様のLEDチップ122aを、より多数個、蛍光体(図示せず)入りの封止樹脂122bで封止したLEDパッケージ222a(222)を用いることができる。また、各LEDチップ122aは、図12に示すように、直列接続されているのが好ましい。 An LED package (white LED) on which a larger number of LED chips are mounted than the other LEDs 22 is used for the LEDs 222 (high-brightness LEDs) arranged at the end (left and right ends) on the short side 32 side of the backlight chassis 30. be able to. For example, as shown in FIG. 11, the LED 222 (high-brightness LED) is sealed with a larger number of LED chips 122a similar to the LED chip 122a shown in FIG. 7 and a phosphor (not shown). An LED package 222a (222) sealed with a resin 122b can be used. Each LED chip 122a is preferably connected in series as shown in FIG.
 このように、第2実施形態では、短辺32側の端部(左右端)に配置されるLEDを、バックライトシャーシ30の中央部に配置されるLED22に比べて輝度が高いLED222を用いることによって、長辺31側の端部(上下端)のみならず、短辺32側の端部(左右端)においても輝度を高めることができる。これにより、4つの端部の全てにおいて輝度の低下を抑制することができるので、輝度均一性をより向上させることができる。 Thus, in 2nd Embodiment, LED222 with a high brightness | luminance is used for LED arrange | positioned at the edge part (right-and-left end) by the side of the short side 32 compared with LED22 arrange | positioned in the center part of the backlight chassis 30. Thus, the luminance can be increased not only at the end (upper and lower ends) on the long side 31 side but also at the end (left and right ends) on the short side 32 side. Thereby, since the fall of a brightness | luminance can be suppressed in all the four edge parts, a brightness | luminance uniformity can be improved more.
 なお、バックライトシャーシ30の短辺32側の端部(左右端)では、中央部に比べて、輝度が、数%~10%程度(たとえば、5%~10%程度)高くなるように設定されるのが好ましい。 In addition, the brightness of the end portion (left and right ends) on the short side 32 side of the backlight chassis 30 is set to be higher by about several to 10% (for example, about 5% to 10%) than the central portion. Preferably it is done.
 第2実施形態のその他の構成および効果は、上記第1実施形態と同様である。 Other configurations and effects of the second embodiment are the same as those of the first embodiment.
 (第3実施形態)
 図13は、本発明の第3実施形態によるバックライトユニットの一部を示した平面図である。図14は、本発明の第3実施形態によるバックライトユニットのLEDの接続状態を示した模式図である。次に、図13および図14を参照して、本発明の第3実施形態によるバックライトユニットについて説明する。なお、各図において、対応する構成要素には同一の符号を付すことにより、重複する説明は適宜省略する。
(Third embodiment)
FIG. 13 is a plan view illustrating a part of the backlight unit according to the third embodiment of the present invention. FIG. 14 is a schematic diagram illustrating a connection state of LEDs of the backlight unit according to the third embodiment of the present invention. Next, a backlight unit according to a third embodiment of the present invention will be described with reference to FIGS. In addition, in each figure, the same code | symbol is attached | subjected to a corresponding component, and the overlapping description is abbreviate | omitted suitably.
 この第3実施形態では、図13および図14に示すように、バックライトシャーシ30の短辺32側の端部(左右端)において、バックライトシャーシ30の中央部(長辺方向(X方向)の中央部)に比べて、短辺方向に配列されたLED22の数が多くなっている。具体的には、バックライトシャーシ30の短辺32側の端部(左右端)に、短辺方向(Y方向)に延びるLEDモジュール20(20c)がさらに配置されている。そして、このLEDモジュール20(20c)に、中央部において短辺方向(Y方向)に配列されたLED22の数よりも多い数のLED22が所定の間隔(たとえば、等間隔)で配列されている。 In the third embodiment, as shown in FIGS. 13 and 14, at the end portion (left and right ends) on the short side 32 side of the backlight chassis 30, the central portion (long side direction (X direction)) of the backlight chassis 30. The number of LEDs 22 arranged in the short side direction is larger than that in the central portion of FIG. Specifically, an LED module 20 (20c) extending in the short side direction (Y direction) is further arranged at the end (left and right ends) of the backlight chassis 30 on the short side 32 side. In the LED module 20 (20c), a larger number of LEDs 22 than the number of LEDs 22 arranged in the short side direction (Y direction) in the central portion are arranged at a predetermined interval (for example, at equal intervals).
 なお、短辺32側の端部(左右端)では、バックライトシャーシ30の中央部(長辺方向(X方向)の中央部)に比べて、短辺方向に配列するLED22の数を、数%~10%程度(たとえば、5%~10%程度)増加させるのが好ましい。 In addition, in the edge part (right-and-left edge) by the side of the short side 32, compared with the center part (center part of a long side direction (X direction)) of the backlight chassis 30, the number of LED22 arranged in a short side direction is several. It is preferable to increase by about 10% to 10% (for example, about 5% to 10%).
 また、上記LEDモジュール20(短辺32側の端部(左右端)に配置されたLEDモジュール20c)に実装されるLED22は、他のLEDモジュール20に実装されるLED22と同タイプの白色LEDから構成されているのが好ましい。 Moreover, LED22 mounted in the said LED module 20 (LED module 20c arrange | positioned at the edge part (right-and-left end) by the side 32 side) is white LED of the same type as LED22 mounted in the other LED module 20. Preferably, it is configured.
 また、図14に示すように、短辺32側の端部(左右端)では、複数のLED22が短辺方向(Y方向)に直列接続されている。すなわち、短辺32側の端部(左右端)に配置されたLEDモジュール20(20c)において、このLEDモジュール20(20c)に実装されている複数のLED22が直列接続されている。 Further, as shown in FIG. 14, a plurality of LEDs 22 are connected in series in the short side direction (Y direction) at the end (left and right ends) on the short side 32 side. That is, in the LED module 20 (20c) arranged at the end (left and right ends) on the short side 32 side, a plurality of LEDs 22 mounted on the LED module 20 (20c) are connected in series.
 なお、短辺32側の端部(左右端)に配置されたLEDモジュール20(20c)におけるLED22の直列数が、他のLEDモジュール20の直列数と異なる場合、異なる電圧となる。この場合、LEDドライバは同じLEDドライバを用いることも可能であるが、別のLEDドライバを用いれば損失を低減できるため好ましい。 In addition, when the series number of LED22 in the LED module 20 (20c) arrange | positioned at the edge part (left-right end) by the short side 32 side differs from the series number of the other LED module 20, it becomes a different voltage. In this case, it is possible to use the same LED driver as the LED driver, but it is preferable to use another LED driver because loss can be reduced.
 第3実施形態では、上記のように、短辺32側の端部(左右端)に、バックライトシャーシ30の中央部よりも多くLED22を配置することによって、長辺31側の端部(上下端)のみならず、短辺32側の端部(左右端)においても、輝度を高めることができる。これにより、4つの端部の全てにおいて輝度の低下を抑制することができるので、輝度均一性をより向上させることができる。 In the third embodiment, as described above, by disposing more LEDs 22 at the end portion (left and right ends) on the short side 32 side than at the center portion of the backlight chassis 30, the end portion (upper and lower sides) on the long side 31 side is arranged. The luminance can be increased not only at the end) but also at the end (left and right ends) on the short side 32 side. Thereby, since the fall of a brightness | luminance can be suppressed in all the four edge parts, a brightness | luminance uniformity can be improved more.
 第3実施形態のその他の構成および効果は、上記第1実施形態と同様である。 Other configurations and effects of the third embodiment are the same as those of the first embodiment.
 なお、今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.
 たとえば、上記第1~第3実施形態では、複数のLEDを直列接続した例を示したが、本発明はこれに限らず、たとえば、各LEDを個別に制御するように構成してもよい。 For example, in the first to third embodiments, an example in which a plurality of LEDs are connected in series has been described. However, the present invention is not limited to this, and for example, each LED may be individually controlled.
 また、LEDモジュールの搭載数や、LEDモジュールに実装されるLEDの数は、上記実施形態で示した構成に限られず、適宜変更することが可能である。たとえば、50型以上の大型のパネルに対しては、図15に示すように、複数のLEDモジュール20を長辺方向(X方向)に並べることで対応することが可能である。この場合、長辺方向(X方向)に隣り合うLEDモジュール20同士を、図示しないコネクタによって電気的に接続することにより、行毎に複数のLED22を直列接続することができる。 Further, the number of LED modules mounted and the number of LEDs mounted on the LED modules are not limited to the configuration shown in the above embodiment, and can be changed as appropriate. For example, it is possible to deal with a large panel of 50 type or more by arranging a plurality of LED modules 20 in the long side direction (X direction) as shown in FIG. In this case, a plurality of LEDs 22 can be connected in series for each row by electrically connecting the LED modules 20 adjacent in the long side direction (X direction) with a connector (not shown).
 また、上記第1~第3実施形態では、複数のLEDを、同タイプの白色LEDから構成した例を示したが、本発明はこれに限らず、たとえば、複数のLEDの一部に、異なるタイプのLEDを用いるようにしてもよい。 In the first to third embodiments, an example in which a plurality of LEDs are configured from white LEDs of the same type has been described. However, the present invention is not limited to this, and, for example, is different for some of the plurality of LEDs. A type of LED may be used.
 また、上記第1~第3実施形態では、バックライトシャーシの端部(上下端、左右端)のみ、LEDの数を多くした例を示したが、本発明はこれに限らず、たとえば、バックライトシャーシの中央部から端部側に向かうにしたがって、段階的にLEDの数が増えるように構成してもよい。 In the first to third embodiments, an example in which the number of LEDs is increased only at the end portions (upper and lower ends, left and right ends) of the backlight chassis is shown. However, the present invention is not limited to this example. You may comprise so that the number of LED may increase in steps as it goes to the edge part side from the center part of a light chassis.
 また、上記第1~第3実施形態では、複数のLEDを配置する基体の一例としてバックライトシャーシを示したが、本発明はこれに限らず、バックライトシャーシ以外の基体上に複数のLEDを配置してもよい。たとえば、板状部材の面上に複数のLEDを二次元状に配置するようにしてもよい。この場合、板状部材に配置された状態でLEDをバックライトシャーシに収容するようにすることもできる。 In the first to third embodiments, the backlight chassis is shown as an example of a substrate on which a plurality of LEDs are arranged. However, the present invention is not limited to this, and a plurality of LEDs are mounted on a substrate other than the backlight chassis. You may arrange. For example, a plurality of LEDs may be two-dimensionally arranged on the surface of the plate member. In this case, the LED can be accommodated in the backlight chassis in a state of being arranged on the plate-like member.
 また、上記した実施形態において、LEDの種類は特に限定されるものではない。たとえば、LEDは、青色発光のLEDチップ(発光チップ)と、そのLEDチップからの光を受けて、黄色光を蛍光発光する蛍光体とを含むものを用いることができる。このようなLEDは、青色発光のLEDチップからの光と蛍光発光する光とで白色光を生成する。なお、LEDに含まれるLEDチップの個数は特に限定されない。 In the above-described embodiment, the type of LED is not particularly limited. For example, the LED may include a blue light emitting LED chip (light emitting chip) and a phosphor that receives light from the LED chip and fluoresces yellow light. Such an LED generates white light using light from a blue light emitting LED chip and light emitted from a fluorescent light. Note that the number of LED chips included in the LED is not particularly limited.
 また、LEDに内蔵される蛍光体は、黄色光を蛍光発光する蛍光体に限らない。たとえば、LEDは、青色発光のLEDチップと、そのLEDチップからの光を受けて緑色光および赤色光を蛍光発光する蛍光体とを含み、LEDチップからの青色光と蛍光発光する光(緑色光、赤色光)とで白色光を生成するものを用いることもできる。 Further, the phosphor incorporated in the LED is not limited to a phosphor that emits yellow light. For example, an LED includes a blue light emitting LED chip and a phosphor that emits green light and red light in response to light from the LED chip, and emits blue light and fluorescent light (green light) from the LED chip. , Red light) and white light can be used.
 また、LEDに内蔵されるLEDチップは、青色発光のものに限られない。たとえば、LEDは、赤色発光の赤色LEDチップと、青色発光の青色LEDチップと、青色LEDチップからの光を受けて緑色光を蛍光発光する蛍光体とを含んでいてもよい。このようなLEDであれば、赤色LEDチップからの赤色光と、青色LEDチップからの青色光と、蛍光発光する緑色光とで白色光を生成することができる。 In addition, the LED chip built in the LED is not limited to the one emitting blue light. For example, the LED may include a red LED chip that emits red light, a blue LED chip that emits blue light, and a phosphor that emits green light by receiving light from the blue LED chip. With such an LED, white light can be generated by red light from the red LED chip, blue light from the blue LED chip, and green light that fluoresces.
 さらに、上記LEDは、蛍光体を全く含まないLEDであってもよい。たとえば、赤色発光の赤色LEDチップと、緑色発光の緑色LEDチップと、青色発光の青色LEDチップとを含み、全てのLEDチップからの光を混色させて白色光を生成するように構成されていてもよい。 Furthermore, the LED may be an LED that does not contain any phosphor. For example, a red LED chip that emits red light, a green LED chip that emits green light, and a blue LED chip that emits blue light are configured to generate white light by mixing light from all LED chips. Also good.
 なお、上記第1~第3実施形態では、LEDの一例として、複数のLEDチップが直列接続されたLEDパッケージを示したが、複数のLEDチップが並列接続されたLEDパッケージを用いることも可能である。 In the first to third embodiments, an LED package in which a plurality of LED chips are connected in series is shown as an example of an LED. However, an LED package in which a plurality of LED chips are connected in parallel can also be used. is there.
 また、上記第1~第3実施形態では、バックライトユニットに、光学部材(光学シート)として、拡散板、プリズムシートおよびレンズシートを含むように構成した例を示したが、本発明はこれに限らず、上記光学部材(光学シート)は、必要に応じて適宜変更(追加、削除)することができる。 In the first to third embodiments, the backlight unit includes the diffuser plate, the prism sheet, and the lens sheet as the optical member (optical sheet). However, the present invention is not limited thereto. However, the optical member (optical sheet) can be appropriately changed (added or deleted) as necessary.
 さらに、上記第1~第3実施形態では、表示装置の一例である液晶表示装置に本発明を適用した例を示したが、本発明はこれに限らず、表示パネルに光を供給するためのバックライトユニットを備えた非発光型の表示装置全般に本発明を適用することができる。 Furthermore, in the first to third embodiments, the example in which the present invention is applied to the liquid crystal display device which is an example of the display device has been described. However, the present invention is not limited to this, and is for supplying light to the display panel. The present invention can be applied to all non-light emitting display devices including a backlight unit.
 なお、上記で開示された技術を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。 Note that embodiments obtained by appropriately combining the techniques disclosed above are also included in the technical scope of the present invention.
 10             液晶表示パネル(表示パネル)
 11             アクティブマトリックス基板
 12             対向基板
 13             偏光フィルム
 20、20a~20c     LEDモジュール
 21             実装基板
 21a            実装面
 22、222         LED(光源)
 30             バックライトシャーシ(基体)
 30a            底部
 30b            側部
 30c            底面
 31             長辺
 32             短辺
 40             反射シート
 41             底部
 41a            穴部
 42             側部
 45             拡散板
 46             プリズムシート
 47             レンズシート
 50             バックライトユニット(照明装置)
 60             LEDドライバ(光源制御部)
 161            第1LEDドライバ(第1光源制御部)
 162            第2LEDドライバ(第2光源制御部)
 70             ハウジング
 71             表ハウジング
 72             裏ハウジング
 100            液晶表示装置(表示装置)
 122a           LEDチップ
 122、222a       LEDパッケージ
 122b           封止樹脂
10 Liquid crystal display panel (display panel)
DESCRIPTION OF SYMBOLS 11 Active matrix board | substrate 12 Opposite board | substrate 13 Polarizing film 20, 20a-20c LED module 21 Mounting board 21a Mounting surface 22, 222 LED (light source)
30 Backlight chassis (base)
30a Bottom portion 30b Side portion 30c Bottom surface 31 Long side 32 Short side 40 Reflective sheet 41 Bottom portion 41a Hole portion 42 Side portion 45 Diffuser plate 46 Prism sheet 47 Lens sheet 50 Backlight unit (illumination device)
60 LED driver (light source controller)
161 1st LED driver (1st light source control part)
162 2nd LED driver (2nd light source control part)
70 housing 71 front housing 72 rear housing 100 liquid crystal display device (display device)
122a LED chip 122, 222a LED package 122b sealing resin

Claims (9)

  1.  複数の光源と、
     前記複数の光源が二次元状に配置される基体とを備え、
     前記基体は、平面的に見て、一対の長辺と一対の短辺とを有する略矩形形状に形成されており、
     少なくとも、前記長辺側の端部の各々には、前記光源が、前記基体の中央部よりも多く配置されていることを特徴とする、照明装置。
    Multiple light sources;
    A substrate on which the plurality of light sources are two-dimensionally arranged,
    The base body is formed in a substantially rectangular shape having a pair of long sides and a pair of short sides when seen in a plan view,
    At least each of the long-side end portions is provided with more light sources than the central portion of the base body.
  2.  前記複数の光源は、それぞれ、発光ダイオードからなり、
     前記発光ダイオードの順電流が、前記複数の光源の各々において、実質的に同じになるように設定されていることを特徴とする、請求項1に記載の照明装置。
    Each of the plurality of light sources comprises a light emitting diode,
    The lighting device according to claim 1, wherein a forward current of the light emitting diode is set to be substantially the same in each of the plurality of light sources.
  3.  前記発光ダイオードは、白色発光ダイオードであることを特徴とする、請求項2に記載の照明装置。 The lighting device according to claim 2, wherein the light emitting diode is a white light emitting diode.
  4.  前記複数の光源は、長辺方向に、直列に接続されていることを特徴とする、請求項1~3のいずれか1項に記載の照明装置。 The lighting device according to any one of claims 1 to 3, wherein the plurality of light sources are connected in series in a long side direction.
  5.  前記複数の光源の駆動を制御する光源制御部をさらに備えることを特徴とする、請求項1~4のいずれか1項に記載の照明装置。 The lighting device according to any one of claims 1 to 4, further comprising a light source control unit that controls driving of the plurality of light sources.
  6.  前記光源制御部は、第1光源制御部と、前記第1光源制御部とは異なる第2光源制御部とを含み、
     前記第1光源制御部は、前記長辺側の端部に配置された前記光源の駆動を制御するとともに、前記第2光源制御部は、前記基体の中央部に配置された前記光源の駆動を制御することを特徴とする、請求項5に記載の照明装置。
    The light source control unit includes a first light source control unit and a second light source control unit different from the first light source control unit,
    The first light source control unit controls driving of the light source arranged at the end on the long side, and the second light source control unit drives driving of the light source arranged at the center of the base. The lighting device according to claim 5, wherein the lighting device is controlled.
  7.  前記短辺側の端部の各々には、前記光源が、前記基体の中央部よりも多く配置されていることを特徴とする、請求項1~6のいずれか1項に記載の照明装置。 The lighting device according to any one of claims 1 to 6, wherein more light sources are disposed at each of the end portions on the short side than at a center portion of the base body.
  8.  前記短辺側の端部に配置される前記光源は、前記基体の中央部に配置される前記光源に比べて輝度が高いことを特徴とする、請求項1~7のいずれか1項に記載の照明装置。 The light source disposed at the end portion on the short side has higher luminance than the light source disposed at a central portion of the base body, according to any one of claims 1 to 7. Lighting equipment.
  9.  請求項1~8のいずれか1項に記載の照明装置と、
     前記照明装置からの光を受ける表示パネルとを備えることを特徴とする、表示装置。
    The lighting device according to any one of claims 1 to 8,
    And a display panel that receives light from the illumination device.
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USD823492S1 (en) 2016-10-04 2018-07-17 Cree, Inc. Light emitting device

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