CN102759051B - Energy-saving backlight module with adjustable viewing angle based on collimation backlight - Google Patents
Energy-saving backlight module with adjustable viewing angle based on collimation backlight Download PDFInfo
- Publication number
- CN102759051B CN102759051B CN201210249776.8A CN201210249776A CN102759051B CN 102759051 B CN102759051 B CN 102759051B CN 201210249776 A CN201210249776 A CN 201210249776A CN 102759051 B CN102759051 B CN 102759051B
- Authority
- CN
- China
- Prior art keywords
- guide plate
- light guide
- light
- light source
- microstructure
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Planar Illumination Modules (AREA)
Abstract
The invention discloses an energy-saving backlight module. The energy-saving backlight module comprises a first light source, a second light source and a light guide plate component, wherein the light emitted by the first light source exits through the light guide plate component, so that a liquid crystal display has a first viewing angle; the light emitted by the second light source exits through the light guide plate component, so that the liquid crystal display has a second viewing angle. The first viewing angle is plus/minus (5-10 degrees), and the second viewing angle is plus/minus (60-70 degrees). The energy-saving backlight module provided by the invention has the beneficial effect that the two light sources are used so that the liquid crystal display selectively has two viewing angles for different viewing occasions. In the case that one person watches the liquid crystal display, the energy-saving backlight module provided by the invention does not need to provide large-angle illumination and only needs to provide positive brightness, thereby reducing energy consumption of the liquid crystal display and reaching the energy-saving purpose.
Description
Technical field
The present invention relates to lcd technology, particularly relating to a kind of visible angle based on collimated back can the energy-saving backlight module of modulation.
Background technology
Liquid crystal display (LCD) is a kind of liquid crystal that adopts is the display of material.Under electric field action, the change that liquid crystal molecule can arrange, thus impact is by its light change, the change of this light can show as the change of light and shade by the effect of polaroid.Like this, people by can control the light and shade change of light to the control of electric field, thus reach the object of display image.At present, the application of liquid crystal display widely, comprises mobile phone, panel computer, Vehicular display device, TV etc.Wherein most liquid crystal display, LCD TV and part mobile phone all adopt TFT(Thin Film Transistor) drive, they are commonly referred to as TFT-LCD.
TFT-LCD display is non-autonomous luminescence type display, needs additional backlight module to provide planar light source.Backlight module is one of key part and component of panel of LCD, generally speaking, can be divided into front light formula (Frontlight) and backlight type (Back light) two kinds.Wherein the backlight module of backlight type can according to the requirement of its scale, is divided into side-light type, full run-down type and hollow type three macrostructure according to the position difference of fluorescent tube.What the present invention related generally to is side-light type (Edge lighting) backlight module.Traditional side-light backlight module adopts light guide plate to form planar light source, and its main member, except light emitting diode (LED) light source, light guide plate, reflector plate, diffusion sheet, also has at least mutually perpendicular light harvesting prismatic lens of two panels (Prism sheet).This prismatic lens is called for short BEF(BrightnessEnhancement Film usually), its role is to the visible angle limiting liquid crystal display, make most light visual angle, front be ± scope of (30 °-60 °) in outgoing, to reach the effect of light harvesting blast.
But, the visible angle of liquid crystal display to be set in a scope determined (such as above mention ± (30 °-60 °)) be unfavorable for that reality uses.In the reality of liquid crystal display uses, sometimes only have a people to watch this display, at this time only need to provide enough brightness just can meet the viewing needs of user at the forward of this display; And sometimes have many people and watch this display simultaneously, at this time then need in the polarizers of big angle scope of this display, provide enough brightness to meet the viewing needs of user.Current prior art is to provide the liquid crystal display with large visible angle to this way to solve the problem, but can see, such display can cause unnecessary energy consumption when user only has a people.
Therefore, those skilled in the art is devoted to develop a kind of energy-saving backlight module, to realize freely switching between the less visible angle and larger visible angle of liquid crystal display.
Summary of the invention
Because the above-mentioned defect of prior art, technical matters to be solved by this invention is to provide a kind of energy-saving backlight module, optionally makes liquid crystal display provide two kinds of visible angles by arranging two kinds of light sources.
For achieving the above object, the invention provides a kind of energy-saving backlight module, it is characterized in that, comprise the first light source, secondary light source and light guide plate member, the light that described first light source sends makes liquid crystal display have the first visible angle after described light guide plate member outgoing, and the light that described secondary light source sends makes described liquid crystal display have the second visible angle after described light guide plate member outgoing.
Further, described first visible angle is ± (5 °-10 °).
Further, described second visible angle is ± (60 °-70 °).
Further, light guide plate member comprises the first light guide plate and the second light guide plate; Described first light guide plate has the first microstructure, described second light guide plate has the second microstructure and fluorescent powder coating pattern; The described light that described first light source sends enters described first light guide plate and is reflected by described first microstructure, form line source, light from described line source enters described second light guide plate and is reflected by described second microstructure, forming surface light source, from the light of described area source from described second light guide plate outgoing; The described light that described secondary light source sends enters the second light guide plate from the first light guide plate and makes described fluorescent powder apply pattern and excites to send white light, and described white light is from described second light guide plate outgoing.
Further, described light guide plate member is fabricated structure or integrated one-piece construction.
Further, described first microstructure is multiple V-shaped groove, and described second microstructure is the microprism of multiple discrete distribution, and described fluorescent powder coating pattern is the fluorescent powder application point of multiple discrete distribution.
Further, described first light source is arranged on the side-walls of described first light guide plate, described secondary light source is arranged on the below of described first light guide plate, and described first microstructure is arranged on the bottom surface of described first light guide plate, and described second microstructure is arranged on the bottom surface of described second light guide plate.
Further, described fluorescent powder coating pattern setting is on the described bottom surface of described second light guide plate or on the end face of described second light guide plate, and the described white light sent after described fluorescent powder coating pattern is excited is from the described end face outgoing of described second light guide plate.
Further, described first light source is LED or LASER Light Source.
Further, described secondary light source is ultraviolet source.
In better embodiment of the present invention, the light guide plate member of fabricated structure that energy-saving backlight module of the present invention comprises the first light source, secondary light source and formed by the first light guide plate and the second assembling light guiding plate.First light source is the collimated light source as LED or LASER Light Source, is arranged on the side-walls of the first light guide plate, launches the light beam of high collimation to the first light guide plate.Secondary light source is ultraviolet source, is arranged on the below of the first light guide plate, sends ultraviolet light, black light and/or extreme ultraviolet light to the first light guide plate.The bottom surface of the first light guide plate has the first microstructure that shape is multiple V-shaped groove, the bottom surface of the second light guide plate has the fluorescent powder coating pattern that the second microstructure that shape is multiple microprism and shape are multiple point-like.When opening the first light source and close secondary light source, the light that first light source sends enters the first light guide plate and is reflected by the first microstructure, form line source, light from this line source enters the second light guide plate and is reflected by the second microstructure, forming surface light source, from the light of this area source from the end face outgoing of the second light guide plate, now energy-saving backlight module of the present invention makes liquid crystal display have the first visible angle, and this first visible angle is ± (5 °-10 °).When opening secondary light source and close the first light source, the ultraviolet light that secondary light source sends enters the second light guide plate from the first light guide plate and makes fluorescent powder apply pattern and excites to send white light, this white light is from the end face outgoing of the second light guide plate, now energy-saving backlight module of the present invention makes liquid crystal display have the second visible angle, and this second visible angle is ± (60 °-70 °).
As can be seen here, energy-saving backlight module of the present invention is by use two kinds of light sources, liquid crystal display can be optionally made to have two kinds of visible angles, a kind of visible angle is less, be suitable for the occasion that a people watches liquid crystal display, another kind of visible angle is comparatively large, is suitable for the occasion that many people watch liquid crystal display simultaneously.Like this, the energy-saving backlight module of the application of the invention, need not provide the light of wide-angle when a people watches liquid crystal display and only need provide forward brightness, thus reducing the energy consumption of liquid crystal display, reaching energy-conservation object.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the stereographic map of energy-saving backlight module of the present invention, shows the one-piece construction of energy-saving backlight module.
Fig. 2 is the integrally-built front elevation of energy-saving backlight module of the present invention, shows the section of the first light guide plate of energy-saving backlight module.
Fig. 3 is the integrally-built side view (using the first light source) of energy-saving backlight module of the present invention, shows the section of the second light guide plate of energy-saving backlight module.
Fig. 4 is the schematic diagram of the second microstructure on the second bottom surface of light guide plate shown in Fig. 3.
Fig. 5 is the integrally-built side view (use secondary light source) of energy-saving backlight module of the present invention, shows the section of the second light guide plate of energy-saving backlight module.
Fig. 6 is the schematic diagram of the second microstructure on the second bottom surface of light guide plate shown in Fig. 5 and fluorescent powder coating pattern.
Embodiment
As shown in Figure 1, in the present embodiment, energy-saving backlight module of the present invention comprises the first light source 10, secondary light source and light guide plate member 30.Wherein, light guide plate member 30 comprises the first light guide plate 31 and the second light guide plate 32.Light guide plate member 30 in the present embodiment assembles by the first light guide plate 31 and the second light guide plate 32 fabricated structure formed.This light guide plate member 30 can be also integrated one-piece construction in other embodiments, comprises first light guide plate 31 and second light guide plate 32 two parts.First light source 10 is collimated light source, such as LED or LASER Light Source.First light source 10 is arranged on the side-walls of the first light guide plate 31, and can launch the light beam of high collimation along the z direction shown in Fig. 1, this light beam enters in the first light guide plate 31 then.Secondary light source is ultraviolet source, is arranged on the below of the first light guide plate 31, can send ultraviolet light, black light and/or extreme ultraviolet light to the first light guide plate 31, and the angle of divergence of its light sent meets conventional Lambert emission body characteristics.Secondary light source can be a ultraviolet source or be combined by multiple ultraviolet source, and the secondary light source of the present embodiment comprises 3 ultraviolet sources, as ultraviolet source 21.
First light guide plate 31 has the bottom surface of inclination, and this plane perpendicular is α (see Fig. 2) in the yz plane shown in Fig. 1 and with the angle of the xz plane shown in Fig. 1.First light guide plate 31 has the end face of inclination, and this end face is 45 ° (see Fig. 3) perpendicular to the xy plane shown in Fig. 1 and with the angle G of the xz plane shown in Fig. 1.Second light guide plate 32 has the bottom surface of inclination, and this plane perpendicular is θ (see Fig. 3) in the xy plane shown in Fig. 1 and with the angle of the xz plane shown in Fig. 1.The top surface being parallel of the second light guide plate 32 is in the xz plane (see Fig. 3) shown in Fig. 1.
First light guide plate 31 has the first microstructure, and as shown in Figure 2, the first microstructure is arranged on the bottom surface of the first light guide plate 31.In the present embodiment, the first microstructure is multiple V-shaped groove, as V-shaped groove 41,42.The parameter of these V-shaped grooves comprises: interval P, angle of inclination beta and pitch angle γ, can realize different optical effects by adjusting these parameters, and such as in the present embodiment, arranging γ is 90 °.Like this, after the light that the first light source 10 sends enters the first light guide plate 31, its each several part will be reflected by each V-shaped groove of the first microstructure respectively.Such as, reflected by V-shaped groove 41 after light L1 is irradiated to V-shaped groove 41, reflected by V-shaped groove 42 after light L2 is irradiated to V-shaped groove 42, and light L3 is not irradiated to any V-shaped groove, continuation is propagated in the z-direction.As can be seen here, the light that the first light source 10 sends is linearly distributed after the first microstructure, namely defines line source (the first light source 10 can regard as pointolite).These will be propagated in the y-direction by the light that each V-shaped groove of the first microstructure reflects, and then be reflected by the end face of the first light guide plate 31, become and propagate in the x-direction and then enter the second light guide plate 32.
Second light guide plate 32 has the second microstructure, and as shown in Figure 3, the second microstructure is arranged on the bottom surface of the second light guide plate 32.In the present embodiment, the second microstructure is the microprism of multiple discrete distribution, as microprism 51,52.In the present embodiment, microprism is that processing base station makes with ultraprecise, has identical structural parameters and makes periodic arrangement.As shown in Figure 4, the parameter of these microprisms comprises: bottom width D1, the long D2 in the end, pitch angle Φ and interval S 1, can realize different optical effects by adjusting these parameters.Like this, after entering the second light guide plate 32 from the light of the first light guide plate 31, its each several part is by respectively by each microprismatic retroreflective of the second microstructure.Such as, reflected by microprism 51 after light L31 is irradiated to microprism 51, reflected by microprism 52 after light L32 is irradiated to microprism 52.As can be seen here, from the distribution in planar after the second microstructure of the linearly distributed light of the first light guide plate 31, namely define area source, and due to the machining precision of the microprism of the second microstructure high, therefore this area source has very high light-emitting uniformity.These will be propagated in the y-direction by the light of the microprismatic retroreflective of the second microstructure, leave the outwards outgoing of the second light guide plate 32.Light due to these outgoing maintains good collimation, and therefore liquid crystal display now has less visible angle by showing as.Namely when open energy-saving backlight module of the present invention the first light source 10 and close secondary light source time, energy-saving backlight module of the present invention can make liquid crystal display have the first visible angle, and this first visible angle is ± (5 °-10 °).
When close energy-saving backlight module of the present invention the first light source 10 and when opening secondary light source, energy-saving backlight module of the present invention can make liquid crystal display have the second visible angle.As shown in Figure 5, the first light source 10 is closed, secondary light source work, and the ultraviolet source 21 of such as secondary light source sends ultraviolet light.This ultraviolet light enters the first light guide plate 31 and is reflected by the end face of the first light guide plate 31, thus is coupled into the second light guide plate 32.Based on this law like this, this ultraviolet light is propagated in leading tabula rasa, when running into fluorescent powder coating pattern, by the fluorescent material exciting this fluorescent powder to apply pattern, makes it send white light.Fluorescent powder coating pattern in the present embodiment is the fluorescent powder application point of multiple discrete distribution, is arranged on the bottom surface of the second light guide plate 32, fluorescent powder application point 61,62 as shwon in Figures 5 and 6.Wherein, the ultraviolet lighting propagated in the second light guide plate 32 has been mapped to fluorescent powder application point 61, and the fluorescent material thus in fluorescent powder application point 61 is excited and sends white light, and ultraviolet light is not irradiated to fluorescent powder application point 62, and thus fluorescent powder application point 62 is not luminous.Fluorescent powder coating pattern is excited the outside outgoing of end face from the second light guide plate 32 of the white light that sends.In other embodiments, fluorescent powder coating pattern also can be arranged on the end face of the second light guide plate 32, and its white light sent leaves the outside outgoing of end face of the second light guide plate 32.Because the be excited dispersion angle of the white light sent of fluorescent powder coating pattern is comparatively random, so liquid crystal display now has larger visible angle.Namely when open energy-saving backlight module of the present invention secondary light source and close the first light source 10 time, energy-saving backlight module of the present invention can make liquid crystal display have the second visible angle, and this second visible angle is ± (60 °-70 °).
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all those skilled in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (2)
1. an energy-saving backlight module, is characterized in that, comprises the first light source, secondary light source and light guide plate member, and described first light source is LED or LASER Light Source, and described secondary light source is ultraviolet source;
Described light guide plate member comprises the first light guide plate and the second light guide plate, described first light guide plate has the first microstructure, described first microstructure is arranged on the bottom surface of described first light guide plate, described first microstructure is multiple V-shaped groove, the inclined bottom surface of described first light guide plate, the angle of the bottom surface of one side of described V-type groove and the inclination of described first light guide plate is 90 °, described second light guide plate have the second microstructure and fluorescent powder coating pattern, described second microstructure is arranged on the bottom surface of described second light guide plate, described fluorescent powder coating pattern setting is on the described bottom surface of described second light guide plate or on the end face of described second light guide plate, described second microstructure is the microprism of multiple discrete distribution, described fluorescent powder coating pattern is the fluorescent powder application point of multiple discrete distribution, described first light guide plate has the end face of inclination, and the angle of described end face and surface level is 45 °,
Described first light source is arranged on the side-walls of described first light guide plate, and described secondary light source is arranged on the below of described first light guide plate;
The described light that described first light source sends enters described first light guide plate and is reflected by described first microstructure, form line source, light from described line source enters described second light guide plate and is reflected by described second microstructure, forming surface light source, from the light of described area source from described second light guide plate outgoing; The described light that described secondary light source sends enters the second light guide plate from the first light guide plate and makes described fluorescent powder apply pattern and excites to send white light, and described white light is from described second light guide plate outgoing;
Described light guide plate member is fabricated structure or integrated one-piece construction.
2. energy-saving backlight module as claimed in claim 1, wherein, the described white light sent after described fluorescent powder coating pattern is excited is from the described end face outgoing of described second light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210249776.8A CN102759051B (en) | 2012-07-18 | 2012-07-18 | Energy-saving backlight module with adjustable viewing angle based on collimation backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210249776.8A CN102759051B (en) | 2012-07-18 | 2012-07-18 | Energy-saving backlight module with adjustable viewing angle based on collimation backlight |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102759051A CN102759051A (en) | 2012-10-31 |
| CN102759051B true CN102759051B (en) | 2015-07-15 |
Family
ID=47053615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210249776.8A Expired - Fee Related CN102759051B (en) | 2012-07-18 | 2012-07-18 | Energy-saving backlight module with adjustable viewing angle based on collimation backlight |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102759051B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925524B (en) * | 2014-04-17 | 2016-03-09 | 上海交通大学 | The energy-saving backlight module that angle of visibility is adjustable |
| DE112015002580T5 (en) * | 2014-05-30 | 2017-04-06 | Cree, Inc. | OPTICAL COMPONENTS FOR LUMINAIRES |
| KR102585534B1 (en) * | 2016-12-20 | 2023-10-05 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN111176016B (en) * | 2020-01-07 | 2022-10-18 | 京东方科技集团股份有限公司 | Backlight module and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5877829A (en) * | 1995-11-14 | 1999-03-02 | Sharp Kabushiki Kaisha | Liquid crystal display apparatus having adjustable viewing angle characteristics |
| CN101358711A (en) * | 2007-08-01 | 2009-02-04 | 奇美电子股份有限公司 | Light supply apparatus and panel display |
| CN101743510A (en) * | 2007-07-17 | 2010-06-16 | 松下电器产业株式会社 | Liquid crystal backlight device and liquid crystal display |
-
2012
- 2012-07-18 CN CN201210249776.8A patent/CN102759051B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5877829A (en) * | 1995-11-14 | 1999-03-02 | Sharp Kabushiki Kaisha | Liquid crystal display apparatus having adjustable viewing angle characteristics |
| CN101743510A (en) * | 2007-07-17 | 2010-06-16 | 松下电器产业株式会社 | Liquid crystal backlight device and liquid crystal display |
| CN101358711A (en) * | 2007-08-01 | 2009-02-04 | 奇美电子股份有限公司 | Light supply apparatus and panel display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102759051A (en) | 2012-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9329328B2 (en) | Light guide plate and backlight module using the same | |
| US9958591B2 (en) | Backlight module | |
| KR101329413B1 (en) | Optical lens, optical module having the optical lens and backlight unit having the optical module | |
| US9429700B2 (en) | Backlight module | |
| US8287172B2 (en) | Planar illumination device | |
| CN104781603B (en) | Light supply apparatus | |
| US7512310B2 (en) | Backlight unit of a liquid crystal display device | |
| US9459393B2 (en) | Backlight module structure | |
| US9690034B2 (en) | Illumination device and display device | |
| CN101178513A (en) | Back light unit | |
| CN101680635B (en) | Light guide unit, illuminating device and liquid crystal display device | |
| US20120120680A1 (en) | Backlight module and light guide plate thereof | |
| CN102175002A (en) | Backlight module and display device | |
| CN102759051B (en) | Energy-saving backlight module with adjustable viewing angle based on collimation backlight | |
| US9028128B2 (en) | Side-edge backlight module | |
| CN101865390B (en) | Backlight module and display device | |
| KR101777528B1 (en) | Backlight module and liquid crystal display device using same | |
| US20130258708A1 (en) | Backlight Module | |
| CN201218442Y (en) | Backlight module and LCD device containing the same | |
| KR20050068216A (en) | Back light structure of a liquid crystal display device | |
| CN103925524B (en) | The energy-saving backlight module that angle of visibility is adjustable | |
| CN101893188A (en) | Backlight module and display device | |
| CN105954926B (en) | Backlight module and liquid crystal display device | |
| US9140930B2 (en) | Slim frame backlight module | |
| Käläntär | A monolithic segmented functional light guide for 2‐D dimming LCD backlight |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20210718 |