WO2006137686A1 - Led array type lens and backlight apparatus using the same - Google Patents

Led array type lens and backlight apparatus using the same Download PDF

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Publication number
WO2006137686A1
WO2006137686A1 PCT/KR2006/002384 KR2006002384W WO2006137686A1 WO 2006137686 A1 WO2006137686 A1 WO 2006137686A1 KR 2006002384 W KR2006002384 W KR 2006002384W WO 2006137686 A1 WO2006137686 A1 WO 2006137686A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
array lens
led array
backlight apparatus
insertion depression
Prior art date
Application number
PCT/KR2006/002384
Other languages
French (fr)
Inventor
Janghwan Hwang
Jungju Kim
Gisik Eom
Seonwook Hwang
Youngju Kwon
Taesub Kim
Seungbae Kim
Original Assignee
Namotek Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Namotek Co., Ltd. filed Critical Namotek Co., Ltd.
Publication of WO2006137686A1 publication Critical patent/WO2006137686A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/13—Devices 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/13—Devices 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0071—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL 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
    • G02F1/00—Devices 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
    • G02F1/01—Devices 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 
    • G02F1/13—Devices 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the present invention relates to a light emitting diode (LED) array lens. More particularly, the present invention relates to an LED array lens superior in workability and appropriate for implementing high brightness, and a backlight apparatus using the same.
  • LED light emitting diode
  • FPD flat panel display
  • CRT cathode ray tube
  • LCD liquid crystal display
  • the LCD displays an image using liquid crystal which is a light receiving element incapable of emitting light by itself, a dedicated light source such as a backlight unit is necessitated.
  • a dedicated light source such as a backlight unit is necessitated.
  • improvement in various factors such as brightness, efficiency, power consumption, optical uniformity, color reproduction, angle of view, thin structure and price competitiveness, are deeply required.
  • the backlight-type lighting system is mounted at a rear side of the screen so that an image is displayed by light transmitted through a liquid display panel.
  • a cold cathode florescent lamp (CCFL), a hot cathode florescent lamp (HCFL), and the likes can be used as the light source.
  • the CCFL is preferably used since it has relatively long lifespan and thin structure, and consumes less power.
  • a plurality of the light sources may be provided in a direct-lit type to light the screen right under the liquid crystal panel.
  • the light source may be provided in an edge-lit type, by being disposed at least one side of the liquid crystal panel and light the screen by a light guide plate (LGP) and a reflection plate.
  • LGP light guide plate
  • a diffusion sheet can be further provided between the liquid crystal panel and the light source.
  • the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a light emitting diode (LED) array lens capable of improving optical uniformity and brightness, and a backlight apparatus using the same.
  • LED light emitting diode
  • a light emitting diode (LED) array lens comprising an upper injected surface inclined in a "V" shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein.
  • LED array lens having an upper injected surface in an inverse pyramid shape, and including at least one LED insertion depression arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein.
  • the upper injected surface having the "V" shape is tapered and inclined downward so that an angle of a central vertex thereof forms approximately 60-120°.
  • An interval between an upper end of the LED insertion depression and the vertex is approximately 0.1 ⁇ 0.3mm.
  • a ceiling surface of the LED insertion depression has a polygonal shape.
  • the LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone.
  • the LED array lens may be made of transparent or semitransparent resin.
  • the LED array lens has both side injected surfaces contacted with the bottom surface and inclined by approximately 50- 120° with respect to the bottom surface.
  • Another aspect of the present invention is to provide a backlight apparatus disposed at a lower part of a liquid crystal layer to output a light, comprising a plurality of LED array lens units linearly arranged at predetermined intervals; a diffusion sheet mounted at an upper part of the LED array lens unit; and a frame for fixing and supporting the LED array lens unit and the diffusion sheet.
  • the LED array lens unit comprises an LED array lens having an upper injected surface inclined in a "V" shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein; and LEDs inserted in the LED insertion depressions.
  • the LED array lens unit comprises an LED array lens having an upper injected surface in an inverse pyramid shape, and including a plurality of LED insertion depressions arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein; and LEDs inserted in the LED insertion depressions.
  • a predetermined air layer is formed between an upper end of the LED and a ceiling surface of the LED insertion depression.
  • a reflection sheet is further provided at a lower surface of the LED array lens unit.
  • the LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone.
  • FIG. 1 is a perspective view of a light emitting diode (LED) array lens according to an embodiment of the present invention
  • FIG. 2 is a side view of the LED array lens according to the embodiment of the present invention
  • FIGS. 3 through 5 show other examples of the LED array lens according to the embodiment of the present invention
  • FIGS. 6 through 8 are perspective view of an LED array lens according to another embodiment of the present invention
  • FIGS. 9 through 12 show examples of various LED insertion depressions of the LED array lens according to the present invention
  • FIG. 13 shows a plurality of the LED array lenses according to the present invention being repeatedly arranged
  • FIG. 14 is a graph illustrating brightness values measured in a space according to the LED array lens of the present invention.
  • FIG. 15 is a graph illustrating brightness values measured on a plane according to the LED array lens of the present invention.
  • FIG. 16 is a graph illustrating measured angle of view according to the LED array lens of the present invention.
  • FIG. 17 is a structure view of a backlight apparatus using the LED array lens of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 1 is a perspective view of a light emitting diode (LED) array lens according to an embodiment of the present invention
  • FIG. 2 is a side view.
  • LED light emitting diode
  • an upper injected surface of an LED array lens 100 is tapered by a predetermined angle.
  • At least one LED insertion depression 200 is formed on a bottom surface of the LED array lens 100, so that the LED can be inserted at predetermined interval away from each other.
  • the LED array lens 100 is made of transparent or semitransparent resin.
  • acryl resin such as polycarbonate or polymethyl-methacrylate (PMMA) can be used for the LED array lens 100.
  • An upper injected surface of the LED array lens 100 is tapered down to a central vertex to have a "V" shape.
  • an angle ⁇ of the central vertex is approximately 40-140°, more preferably, 60-120°.
  • Table 1 shows brightness values according to the angle of vertex in the embodiment of the present invention. Comparing the brightness values when the angle of vertex ⁇ is not greater than 60 and not less than 120 with the brightness values when within a range of 60-120° the brightness values when the angle of vertex ⁇ is 60-120° are remarkably higher at each measurement point.
  • the LED array lens 100 has both side injected surfaces contacted with a bottom surface and inclined by approximately 50-120° with respect to the bottom surface.
  • the LED array lens 100 may have the upper injected surface recessed in an inverse pyramid shape instead of the "V" shape.
  • the LED array lens 100 may have the upper injected surface recessed in an inverse pyramid shape instead of the "V" shape.
  • the LED insertion depression 200 formed on the bottom surface has predetermined width W for inserting therein the LED. As shown in FIGS. 9 through 12, a ceiling surface of the LED insertion depression 200 is protruded to the upper injected surface. Otherwise, the LED insertion depression 200 may have one of various forms including polygonal prism, hemisphere, cylinder, cone and polygonal cone.
  • an interval between the DC ling surface of the LED insertion depression 200 and the vertex of the upper injected surface is approximately 0.1-0.3mm. It will be sure understood that shape of the ceiling surface of the LED insertion depression 200 and angle of the both side injected surfaces of the LED array lens 100 are not limited.
  • a predetermined air layer (not shown) can be further comprised between an upper end of the LED being inserted in the LED insertion depression 200 and the ceiling surface.
  • optical diffusion efficiency can be much enhanced due to difference in refractive indexes between the material of the LED array lens 100 and the air layer. Whether to provide the air layer is determined by types of the LED to be inserted in the LED insertion depression 200.
  • the LED to be inserted in the LED insertion depression 200 may comprise red, green and blue LEDs, or a single white LED.
  • a plurality of LEDs are linearly arranged as if a plurality of CCFLs were arranged in multiple rows, thereby configuring an LED array in the CCFL form.
  • the LED array can be configured in the flat florescent lamp (FFL) form by arranging a plurality of the CCFL LED arrays parallel.
  • FTL flat florescent lamp
  • the CCFL LED arrays are linearly arranged in this embodiment, the present invention is not limited to have the linear arrangement.
  • the CCFL LED arrays can be arranged in concentric circles as long as configuring in the FFL form.
  • the number of LED to be inserted in the LED insertion depression 200 can be determined by size of the liquid crystal panel or the LED array lens 100.
  • the interval among the LEDs is also determined by size of the liquid crystal panel from several to tens of mm.
  • FIG. 14 is a graph illustrating brightness measured in a space according to the above-structured LED array lens 100, and FIG. 15 brightness measured on a plane.
  • FIG. 16 is a graph illustrating measured angle of view according to the LED array lens 100 of the present invention.
  • the average brightness is ap- proximately 50,000cd/m while the angle of view is not less than 150°. In other words, both the average brightness and the angle of view are high.
  • a backlight apparatus is embodied using the LED array lens 100, and the brightness values are measured in a space.
  • the brightness values are shown in [Table 2] as below.
  • [Table 3] compares the average brightness at each measuring point based on [Table 2] with brightness in a general backlight apparatus.
  • [55] [Table 4] shows the brightness values measured on a plane according to point, in the backlight apparatus using the LED array lens 100.
  • [Table 5] compares the average brightness measured on a plane according to each measuring point based on [Table 4] with plane brightness in the general backlight apparatus. According to [Table 4] and [Table 5], the plane brightness is also much higher in the backlight apparatus using the LED array lens 100 than in the general backlight apparatus.
  • FIG. 17 shows the structure of the backlight apparatus using the LED array lens 100 as a backlight system for the liquid crystal device.
  • the backlight apparatus comprises a plurality of the LED array lens units 100a arranged at certain intervals, a diffusion sheet 300 mounted at an upper part of the respective LED array lens units 100a, and a frame 400 for fixing and supporting the LED array lens units 100a and the diffusion sheet 300.
  • the diffusion sheet 300 is mounted at a predetermined distance away from the upper part of the LED array lens unit 100a to evenly diffuse strong light output from the LED array lens unit 100a.
  • a reflection sheet (not shown) may be further comprised at a lower surface of the LED array lens unit 100a in order to prevent loss of the light being output from the LED array lens unit 100a.
  • the LED array lens unit 100a is made of transparent or semitransparent resin.
  • acryl resin such as polycarbonate or polymethyl-methacrylate (PMMA) can be used for the LED array lens unit 100a.
  • each LED array lens unit 100a is tapered down toward the central vertex to have a "V" shape or an inverse pyramid shape.
  • the angle ⁇ of the central vertex is approximately 60-140°, more preferably, 70-120°.
  • both side injected surfaces contacted with the bottom surface are inclined by approximately 50-120° with respect to the bottom surface.
  • the LED insertion depression 200 formed on the bottom surface has predetermined width W for inserting therein the LED.
  • a ceiling surface of the LED insertion depression 200 is protruded to the upper injected surface.
  • the LED insertion depression 200 may have one of various forms including polygonal prism, hemisphere, cylinder, cone and polygonal cone.
  • the interval between the ceiling surface of the LED insertion depression 200 and the vertex of the upper injected surface is approximately 0.1-0.3mm.
  • the diffusion sheet 300 mounted on the LED lenses 100 constructed by LED arrays diffuses the strong light output from the LED arrays evenly, the brightness can be improved as much.
  • the present invention is related to an LED array lens, more particularly to an LED array lens superior in workability and appropriate for implementing high brightness, and a backlight apparatus using the LED array lens.

Abstract

Disclosed are an LED array lens capable of improving optical uniformity and brightness, and a backlight apparatus using the same. The LED array comprises an upper injected surface inclined in a 'V' shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein. The backlight apparatus using the LED array lens is disposed at a lower part of a liquid crystal layer to output a light, and comprises a plurality of LED array lens units linearly arranged at predetermined intervals, a diffusion sheet mounted at an upper part of the LED array lens unit, and a frame for fixing and supporting the LED array lens unit and the diffusion sheet.

Description

Description
LED ARRAY LENS AND BACKLIGHT APPARATUS USING
THE SAME
Technical Field
[1] The present invention relates to a light emitting diode (LED) array lens. More particularly, the present invention relates to an LED array lens superior in workability and appropriate for implementing high brightness, and a backlight apparatus using the same. Background Art
[2] As demand for high-resolution display device recently increases, development of a flat panel display (FPD) rather than a conventional cathode ray tube (CRT) relatively larger and heavier has been required. A liquid crystal display (LCD) has been developed as an example of the FPDs.
[3] Since the LCD displays an image using liquid crystal which is a light receiving element incapable of emitting light by itself, a dedicated light source such as a backlight unit is necessitated. In order to implement a high-resolution LCD, improvement in various factors such as brightness, efficiency, power consumption, optical uniformity, color reproduction, angle of view, thin structure and price competitiveness, are deeply required.
[4] Image quality of the LCD is highly subject to the light source because the LCD cannot emit light by itself. Therefore, a reflection-type lighting system using an external light source has mainly been adopted for the LCD of a twist nematic (TN) mode or a super twist nematic (STN) mode.
[5] However, as consumer's demands for wide screen and elegant view increase, a backlight-type lighting system has been more adopted. Differently from the external light source mounted to a front or a side of the screen, the backlight-type lighting system is mounted at a rear side of the screen so that an image is displayed by light transmitted through a liquid display panel. For this, a cold cathode florescent lamp (CCFL), a hot cathode florescent lamp (HCFL), and the likes can be used as the light source. Especially, the CCFL is preferably used since it has relatively long lifespan and thin structure, and consumes less power.
[6] A plurality of the light sources may be provided in a direct-lit type to light the screen right under the liquid crystal panel. The light source may be provided in an edge-lit type, by being disposed at least one side of the liquid crystal panel and light the screen by a light guide plate (LGP) and a reflection plate. In order to enhance uniformity of brightness, here, a diffusion sheet can be further provided between the liquid crystal panel and the light source.
[7] In the CCFL used for a wide screen, however, mercury contained in gas sealed in a discharge tube easily produces amalgam by reaction with metal. Accordingly, lifespan of the lamp can be deteriorated, and brightness easily varies according to temperature. Especially, use of mercury, which is a poisonous heavy metal, is restricted to protect the environment. Furthermore, the CCFL is not power-economical and limited in reproducing various colors due to uneven brightness.
[8] Additionally, because the CCFL occupies a large space in the backlight unit, it becomes hard to achieve a compact-size backlight unit. Moreover, as uniformity of brightness is deteriorated, optical uniformity needs to be adjusted by the diffusion plate proportionally to brightness of the light source. Disclosure of Invention Technical Problem
[9] Therefore, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a light emitting diode (LED) array lens capable of improving optical uniformity and brightness, and a backlight apparatus using the same. Technical Solution
[10] In order to achieve an aspect of the present invention, there is provided a light emitting diode (LED) array lens comprising an upper injected surface inclined in a "V" shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein.
[11] According to another embodiment of the present invention, there is provided an
LED array lens having an upper injected surface in an inverse pyramid shape, and including at least one LED insertion depression arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein.
[12] The upper injected surface having the "V" shape is tapered and inclined downward so that an angle of a central vertex thereof forms approximately 60-120°.
[13] An interval between an upper end of the LED insertion depression and the vertex is approximately 0.1~0.3mm.
[14] A ceiling surface of the LED insertion depression has a polygonal shape.
[15] The LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone.
[16] The LED array lens may be made of transparent or semitransparent resin.
[17] The LED array lens has both side injected surfaces contacted with the bottom surface and inclined by approximately 50- 120° with respect to the bottom surface.
[18] Another aspect of the present invention is to provide a backlight apparatus disposed at a lower part of a liquid crystal layer to output a light, comprising a plurality of LED array lens units linearly arranged at predetermined intervals; a diffusion sheet mounted at an upper part of the LED array lens unit; and a frame for fixing and supporting the LED array lens unit and the diffusion sheet.
[19] The LED array lens unit comprises an LED array lens having an upper injected surface inclined in a "V" shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein; and LEDs inserted in the LED insertion depressions.
[20] The LED array lens unit comprises an LED array lens having an upper injected surface in an inverse pyramid shape, and including a plurality of LED insertion depressions arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein; and LEDs inserted in the LED insertion depressions.
[21] A predetermined air layer is formed between an upper end of the LED and a ceiling surface of the LED insertion depression.
[22] A reflection sheet is further provided at a lower surface of the LED array lens unit.
[23] The LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone.
Advantageous Effects
[24] According to a light emitting diode (LED) array lens and a backlight apparatus using the same, workability for manufacturing the lens can be highly improved since the LED can be inserted merely by forming an LED insertion depression on a lower surface of the lens. [25] In addition, high brightness can be achieved with minor number of LEDs, thereby saving the cost. Optical uniformity and angle of view can also be improved.
Brief Description of the Drawings [26] The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which: [27] FIG. 1 is a perspective view of a light emitting diode (LED) array lens according to an embodiment of the present invention; [28] FIG. 2 is a side view of the LED array lens according to the embodiment of the present invention; [29] FIGS. 3 through 5 show other examples of the LED array lens according to the embodiment of the present invention; [30] FIGS. 6 through 8 are perspective view of an LED array lens according to another embodiment of the present invention; [31] FIGS. 9 through 12 show examples of various LED insertion depressions of the LED array lens according to the present invention;
[32] FIG. 13 shows a plurality of the LED array lenses according to the present invention being repeatedly arranged;
[33] FIG. 14 is a graph illustrating brightness values measured in a space according to the LED array lens of the present invention;
[34] FIG. 15 is a graph illustrating brightness values measured on a plane according to the LED array lens of the present invention;
[35] FIG. 16 is a graph illustrating measured angle of view according to the LED array lens of the present invention; and
[36] FIG. 17 is a structure view of a backlight apparatus using the LED array lens of the present invention. Best Mode for Carrying Out the Invention
[37] FIG. 1 is a perspective view of a light emitting diode (LED) array lens according to an embodiment of the present invention, and FIG. 2 is a side view.
[38] As shown in FIGS. 1 and 2, an upper injected surface of an LED array lens 100 is tapered by a predetermined angle. At least one LED insertion depression 200 is formed on a bottom surface of the LED array lens 100, so that the LED can be inserted at predetermined interval away from each other.
[39] The LED array lens 100 is made of transparent or semitransparent resin. For example, acryl resin such as polycarbonate or polymethyl-methacrylate (PMMA) can be used for the LED array lens 100.
[40] An upper injected surface of the LED array lens 100 is tapered down to a central vertex to have a "V" shape. Here, an angle α of the central vertex is approximately 40-140°, more preferably, 60-120°. [Table 1] as below shows brightness values according to the angle of vertex in the embodiment of the present invention. Comparing the brightness values when the angle of vertex α is not greater than 60 and not less than 120 with the brightness values when within a range of 60-120° the brightness values when the angle of vertex α is 60-120° are remarkably higher at each measurement point.
[41] Table 1
Figure imgf000005_0001
Figure imgf000006_0001
[42] Referring to FIGS. 3 through 5, the LED array lens 100 according to the embodiment of the present invention has both side injected surfaces contacted with a bottom surface and inclined by approximately 50-120° with respect to the bottom surface.
[43] As shown in FIGS. 6 through 8, the LED array lens 100 may have the upper injected surface recessed in an inverse pyramid shape instead of the "V" shape. By forming the upper injected surface in the "V" shape or the inverse pyramid shape, light emitted from the LED can be evenly distributed to every direction, thereby improving brightness.
[44] In the LED array lens 100 of the present embodiment, the LED insertion depression
200 formed on the bottom surface has predetermined width W for inserting therein the LED. As shown in FIGS. 9 through 12, a ceiling surface of the LED insertion depression 200 is protruded to the upper injected surface. Otherwise, the LED insertion depression 200 may have one of various forms including polygonal prism, hemisphere, cylinder, cone and polygonal cone.
[45] According to the embodiment of the present invention, an interval between the cei ling surface of the LED insertion depression 200 and the vertex of the upper injected surface is approximately 0.1-0.3mm. It will be sure understood that shape of the ceiling surface of the LED insertion depression 200 and angle of the both side injected surfaces of the LED array lens 100 are not limited.
[46] A predetermined air layer (not shown) can be further comprised between an upper end of the LED being inserted in the LED insertion depression 200 and the ceiling surface. When the air layer is formed, optical diffusion efficiency can be much enhanced due to difference in refractive indexes between the material of the LED array lens 100 and the air layer. Whether to provide the air layer is determined by types of the LED to be inserted in the LED insertion depression 200.
[47] The LED to be inserted in the LED insertion depression 200 may comprise red, green and blue LEDs, or a single white LED. Referring to FIG. 13, a plurality of LEDs are linearly arranged as if a plurality of CCFLs were arranged in multiple rows, thereby configuring an LED array in the CCFL form. The LED array can be configured in the flat florescent lamp (FFL) form by arranging a plurality of the CCFL LED arrays parallel. [48] Although the CCFL LED arrays are linearly arranged in this embodiment, the present invention is not limited to have the linear arrangement. For example, the CCFL LED arrays can be arranged in concentric circles as long as configuring in the FFL form.
[49] The number of LED to be inserted in the LED insertion depression 200 can be determined by size of the liquid crystal panel or the LED array lens 100. The interval among the LEDs is also determined by size of the liquid crystal panel from several to tens of mm.
[50] FIG. 14 is a graph illustrating brightness measured in a space according to the above-structured LED array lens 100, and FIG. 15 brightness measured on a plane. FIG. 16 is a graph illustrating measured angle of view according to the LED array lens 100 of the present invention. As shown in FIG. 15, the average brightness is ap- proximately 50,000cd/m while the angle of view is not less than 150°. In other words, both the average brightness and the angle of view are high.
[51] A backlight apparatus is embodied using the LED array lens 100, and the brightness values are measured in a space. The brightness values are shown in [Table 2] as below. [Table 3] compares the average brightness at each measuring point based on [Table 2] with brightness in a general backlight apparatus.
[52] Table 2
Figure imgf000007_0001
[53] Table 3
Figure imgf000007_0002
[54] As shown in [Table 2] and [Table 3], the spatial brightness is remarkably higher in the backlight apparatus using the LED array lens 100 than in the general backlight apparatus.
[55] [Table 4] shows the brightness values measured on a plane according to point, in the backlight apparatus using the LED array lens 100. [Table 5] compares the average brightness measured on a plane according to each measuring point based on [Table 4] with plane brightness in the general backlight apparatus. According to [Table 4] and [Table 5], the plane brightness is also much higher in the backlight apparatus using the LED array lens 100 than in the general backlight apparatus.
[56] Table 4
Figure imgf000008_0001
[57] Table 5
Figure imgf000008_0002
[58] Hereinafter, structure and operation of the backlight apparatus using the LED array lens 100 will be explained. [59] FIG. 17 shows the structure of the backlight apparatus using the LED array lens 100 as a backlight system for the liquid crystal device. The backlight apparatus comprises a plurality of the LED array lens units 100a arranged at certain intervals, a diffusion sheet 300 mounted at an upper part of the respective LED array lens units 100a, and a frame 400 for fixing and supporting the LED array lens units 100a and the diffusion sheet 300.
[60] The diffusion sheet 300 is mounted at a predetermined distance away from the upper part of the LED array lens unit 100a to evenly diffuse strong light output from the LED array lens unit 100a.
[61] A reflection sheet (not shown) may be further comprised at a lower surface of the LED array lens unit 100a in order to prevent loss of the light being output from the LED array lens unit 100a.
[62] The LED array lens unit 100a is made of transparent or semitransparent resin. For example, acryl resin such as polycarbonate or polymethyl-methacrylate (PMMA) can be used for the LED array lens unit 100a.
[63] The upper injected surface of each LED array lens unit 100a is tapered down toward the central vertex to have a "V" shape or an inverse pyramid shape. When the upper injected surface has the "V" shape, the angle α of the central vertex is approximately 60-140°, more preferably, 70-120°.
[64] In addition, in the LED array lens unit 100a, both side injected surfaces contacted with the bottom surface are inclined by approximately 50-120° with respect to the bottom surface. The LED insertion depression 200 formed on the bottom surface has predetermined width W for inserting therein the LED. A ceiling surface of the LED insertion depression 200 is protruded to the upper injected surface. Otherwise, the LED insertion depression 200 may have one of various forms including polygonal prism, hemisphere, cylinder, cone and polygonal cone. Here, the interval between the ceiling surface of the LED insertion depression 200 and the vertex of the upper injected surface is approximately 0.1-0.3mm.
[65] According to the backlight apparatus using the LED array lens 100, since the diffusion sheet 300 mounted on the LED lenses 100 constructed by LED arrays diffuses the strong light output from the LED arrays evenly, the brightness can be improved as much.
[66] While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Industrial Applicability
[67] The present invention is related to an LED array lens, more particularly to an LED array lens superior in workability and appropriate for implementing high brightness, and a backlight apparatus using the LED array lens.

Claims

Claims
[I] A light emitting diode (LED) array lens comprising: an upper injected surface inclined in a "V" shape; and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein. [2] The LED array lens of claim 1, wherein the upper injected surface having the
"V" shape is tapered and inclined downward so that an angle of a central vertex thereof forms approximately 60-120°. [3] The LED array lens of claim 2, wherein an interval between an upper end of the
LED insertion depression and the vertex is approximately 0.1~0.3mm. [4] The LED array lens of any of claim 1 and claim 2, wherein a ceiling surface of the LED insertion depression has a polygonal shape. [5] The LED array lens of claim 4, wherein the LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone. [6] The LED array lens of any of claim 1 or claim 2, being made of transparent or semitransparent resin. [7] The LED array lens of any of claim 1 or claim 2, having both side injected surfaces contacted with the bottom surface and inclined by approximately
50~120°with respect to the bottom surface. [8] An LED array lens having an upper injected surface in an inverse pyramid shape, and including at least one LED insertion depression arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein. [9] A backlight apparatus disposed at a lower part of a liquid crystal layer to output a light, comprising: a plurality of LED array lens units linearly arranged at predetermined intervals; a diffusion sheet mounted at an upper part of the LED array lens unit; and a frame for fixing and supporting the LED array lens unit and the diffusion sheet. [10] The backlight apparatus of claim 9, wherein the LED array lens unit comprises: an LED array lens having an upper injected surface inclined in a "V" shape, and at least one LED insertion depression formed on a bottom surface of the LED array lens at predetermined intervals to insert an LED therein; and
LEDs inserted in the LED insertion depressions.
[I I] The backlight apparatus of claim 9, wherein the LED array lens unit comprises: an LED array lens having an upper injected surface in an inverse pyramid shape, and including a plurality of LED insertion depressions arranged on a bottom surface at predetermined intervals thereof for inserting an LED therein; and LEDs inserted in the LED insertion depressions. [12] The backlight apparatus of any of claim 10 or claim 11, wherein a predetermined air layer is formed between an upper end of the LED and a ceiling surface of the
LED insertion depression. [13] The backlight apparatus of any of claim 10 or claim 11, wherein a reflection sheet is further provided at a lower surface of the LED array lens unit. [14] The backlight apparatus of any of claim 10 or claim 11, wherein the LED insertion depression has one of various forms including hemisphere, cylinder, cone, and polygonal cone.
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US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
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US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
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US8928025B2 (en) 2007-12-20 2015-01-06 Ilumisys, Inc. LED lighting apparatus with swivel connection
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US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957184B1 (en) * 2011-12-02 2019-03-13 엘지전자 주식회사 Backlight unit and display apparatus having the same
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US9823507B2 (en) 2013-02-14 2017-11-21 Lg Electronics Inc. Display device
KR20150072515A (en) 2013-12-19 2015-06-30 삼성디스플레이 주식회사 Backlight unit and display apparatus having the same
KR102342538B1 (en) * 2021-09-01 2021-12-23 박장우 Bottom traffic signal lihgts to improve awareness of light emitting

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002298629A (en) * 2001-03-30 2002-10-11 Nichia Chem Ind Ltd Light emitting device
JP2003158302A (en) * 2001-11-21 2003-05-30 Toyoda Gosei Co Ltd Light emitting diode
JP2004133391A (en) * 2002-06-24 2004-04-30 Lumileds Lighting Us Llc Side-emitting led and lens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002298629A (en) * 2001-03-30 2002-10-11 Nichia Chem Ind Ltd Light emitting device
JP2003158302A (en) * 2001-11-21 2003-05-30 Toyoda Gosei Co Ltd Light emitting diode
JP2004133391A (en) * 2002-06-24 2004-04-30 Lumileds Lighting Us Llc Side-emitting led and lens

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US9101026B2 (en) 2008-10-24 2015-08-04 Ilumisys, Inc. Integration of LED lighting with building controls
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