CN102759051A - 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
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- CN102759051A CN102759051A CN2012102497768A CN201210249776A CN102759051A CN 102759051 A CN102759051 A CN 102759051A CN 2012102497768 A CN2012102497768 A CN 2012102497768A CN 201210249776 A CN201210249776 A CN 201210249776A CN 102759051 A CN102759051 A CN 102759051A
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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, but relate in particular to a kind of module energy-saving backlight of the visible angle modulation based on collimated back.
Background technology
LCD (LCD) is that a kind of liquid crystal that adopts is the display of material.Under electric field action, the variation that liquid crystal molecule can be arranged, thus its light variation is passed through in influence, and the variation of this light can show as the variation of light and shade through the effect of polaroid.Like this, people change through the light and shade that can control light to the control of electric field, thereby reach the purpose of display image.At present, the application of LCD is very extensive, comprises mobile phone, panel computer, Vehicular display device, TV etc.Wherein most LCD, LCD TV and part mobile phone all adopt TFT (Thin Film Transistor) to drive, and they are commonly referred to as TFT-LCD.
The TFT-LCD display is non-autonomous luminescence type display, need add module backlight planar light source is provided.Module backlight is one of key part and component of panel of LCD, generally speaking, and light formula (Front light) and two kinds of backlight types (Back light) before can being divided into.Wherein the module backlight of backlight type can be according to the requirement of its scale, is divided into side-light type, full run-down type and hollow type three macrostructures according to the position difference of fluorescent tube.What the present invention related generally to is side-light type (Edge lighting) module backlight.Traditional side-light type module backlight adopts LGP to form planar light source, and its main member also has at least two mutually perpendicular light harvesting prismatic lenses (Prism sheet) except light emitting diode (LED) light source, LGP, reflector plate, diffusion sheet.This prismatic lens is called for short BEF (Brightness Enhancement Film) usually; Its role is to limit the visible angle of LCD; Make most light at positive visual angle for outgoing in the ± scope of (30 °-60 °), to reach the effect of light harvesting blast.
Yet, the visible angle of LCD is set in the definite scope (for example mention in the preceding text ± (30 °-60 °)) and is unfavorable for that reality uses.In the reality of LCD is used, have only a people to watch this display sometimes, at this time only need provide enough brightness just can satisfy user's the needs of watching at the forward of this display; Watch this display simultaneously and have many people sometimes, at this time then need in the polarizers of big angle scope of this display, provide enough brightness to satisfy user's the needs of watching.Present prior art provides the LCD with big visible angle to this way to solve the problem, but can see, such display has only the user under a people the situation can cause unnecessary energy consumption.
Therefore, those skilled in the art is devoted to develop a kind of energy-saving module backlight, with freely switching between the less visible angle that is implemented in LCD and the big visible angle.
Summary of the invention
Because the above-mentioned defective of prior art, technical problem to be solved by this invention provides a kind of energy-saving module backlight, comes optionally to make LCD that two kinds of visible angles are provided through two kinds of light sources are set.
For realizing above-mentioned purpose; The invention provides a kind of energy-saving module backlight; It is characterized in that; Comprise first light source, secondary light source and LGP member, make LCD have first visible angle after the said LGP member of the light process outgoing that said first light source sends, make said LCD have second visible angle after the said LGP member of the light process outgoing that said secondary light source sends.
Further, said first visible angle is ± (5 °-10 °).
Further, said second visible angle is ± (60 °-70 °).
Further, the LGP member comprises first LGP and second LGP; Have first micro-structural on said first LGP, have second micro-structural and fluorescent material on said second LGP and apply pattern; The said light that said first light source sends gets into said first LGP and is reflected by said first micro-structural; Form line source; Get into said second LGP and by said second micro-structural reflection from the light of said line source; Form area source, from the light of said area source from the said second LGP outgoing; The said light that said secondary light source sends gets into second LGP and makes said fluorescent material apply pattern from first LGP and excites to send white light, and said white light is from the said second LGP outgoing.
Further, said LGP member is fabricated structure or integrated overall structure.
Further, said first micro-structural is a plurality of V-shaped grooves, and said second micro-structural is the microprism of a plurality of Discrete Distribution, and it is the fluorescent material application point of a plurality of Discrete Distribution that said fluorescent material applies pattern.
Further; Said first light source is arranged on the side-walls of said first LGP; Said secondary light source is arranged on the below of said first LGP, and said first micro-structural is arranged on the bottom surface of said first LGP, and said second micro-structural is arranged on the bottom surface of said second LGP.
Further, said fluorescent material applies pattern setting on the said bottom surface of said second LGP or on the end face of said second LGP, and the said white light that sends after said fluorescent material coating pattern is excited is from the said end face outgoing of said second LGP.
Further, said first light source is LED or LASER Light Source.
Further, said secondary light source is a ultraviolet source.
In preferred embodiments of the present invention, energy-saving module backlight of the present invention comprises first light source, secondary light source and the LGP member of the fabricated structure that formed by first LGP and the assembling of second LGP.First light source is the collimated light source like LED or LASER Light Source, is arranged on the side-walls of first LGP, launches the light beam of high collimation to first LGP.Secondary light source is a ultraviolet source, is arranged on the below of first LGP, sends ultraviolet light, black light and/or extreme ultraviolet light to first LGP.Having shape on the bottom surface of first LGP is first micro-structural of a plurality of V-shaped grooves, has shape on the bottom surface of second LGP and is second micro-structural of a plurality of microprisms and fluorescent material that shape is a plurality of point-like and apply pattern.When opening first light source and closing secondary light source; The light that first light source sends gets into first LGP and by first micro-structural reflection, forms line source, gets into second LGP and is reflected by second micro-structural from the light of this line source; Form area source; From the end face outgoing from second LGP of the light of this area source, this moment, energy-saving module backlight of the present invention made LCD have first visible angle, and this first visible angle is ± (5 °-10 °).When opening secondary light source and close first light source; The ultraviolet light that secondary light source sends gets into second LGP and makes fluorescent material apply pattern from first LGP and excites to send white light; This white light is from the end face outgoing of second LGP; This moment, energy-saving module backlight of the present invention made LCD have second visible angle, and this second visible angle is ± (60 °-70 °).
This shows; Energy-saving module backlight of the present invention is through using two kinds of light sources; Can optionally make LCD have two kinds of visible angles, a kind of visible angle is less, is suitable for the occasion that a people watches LCD; Another kind of visible angle is bigger, is suitable for the occasion that many people watch LCD simultaneously.Like this, the module energy-saving backlight of the application of the invention needn't provide the light of wide-angle and forward brightness only need be provided when a people watches LCD, thereby has reduced the energy consumption of LCD, has reached purpose of energy saving.
Below will combine accompanying drawing that the technique effect of design of the present invention, concrete structure and generation is described further, to understand the object of the invention, characteristic and effect fully.
Description of drawings
Fig. 1 is the stereogram of energy-saving module backlight of the present invention, has shown the overall structure of energy-saving module backlight.
Fig. 2 is the integrally-built front view of energy-saving module backlight of the present invention, has shown the section of first LGP of energy-saving module backlight.
Fig. 3 is the integrally-built side view (using first light source) of energy-saving module backlight of the present invention, has shown the section of second LGP of energy-saving module backlight.
Fig. 4 is the sketch map of second micro-structural on second bottom surface of light guide plate shown in Figure 3.
Fig. 5 is the integrally-built side view (use secondary light source) of energy-saving module backlight of the present invention, has shown the section of second LGP of energy-saving module backlight.
Fig. 6 is the sketch map that second micro-structural and the fluorescent material on second bottom surface of light guide plate shown in Figure 5 applies pattern.
The specific embodiment
As shown in Figure 1, in the present embodiment, energy-saving module backlight of the present invention comprises first light source 10, secondary light source and LGP member 30.Wherein, LGP member 30 comprises first LGP 31 and second LGP 32.LGP member 30 in the present embodiment is the fabricated structures that formed by first LGP 31 and 32 assemblings of second LGP.This LGP member 30 can be integrated overall structure also in other embodiment, comprises first LGP 31 and second LGP, 32 two parts.First light source 10 is a collimated light source, for example LED or LASER Light Source.First light source 10 is arranged on the side-walls of first LGP 31, can launch the light beam of high collimation along z direction shown in Figure 1, and this light beam gets in first LGP 31 then.Secondary light source is a ultraviolet source, is arranged on the below of first LGP 31, can send ultraviolet light, black light and/or extreme ultraviolet light to first LGP 31, and the angle of divergence of the light that it sends meets conventional Lambertian emitter characteristic.Secondary light source can be a ultraviolet source or combined by a plurality of ultraviolet sources that the secondary light source of present embodiment comprises 3 ultraviolet sources, like ultraviolet source 21.
Have first micro-structural on first LGP 31, as shown in Figure 2, first micro-structural is arranged on the bottom surface of first LGP 31.In the present embodiment, first micro-structural is a plurality of V-shaped grooves, like V-shaped groove 41,42.The parameter of these V-shaped grooves comprises: interval P, angle of inclination beta and inclination angle γ, can realize different optical effects through adjusting these parameters, and for example in the present embodiment, it is 90 ° that γ is set.Like this, after the light that first light source 10 sends got into first LGP 31, its each several part will be respectively by each V-shaped groove reflection of first micro-structural.For example, light L1 shines V-shaped groove 41 backs by V-shaped groove 41 reflections, and light L2 shines V-shaped groove 42 backs by V-shaped groove 42 reflections, and light L3 does not shine any V-shaped groove, will continue to propagate along the z direction.This shows that the light that first light source 10 sends is wire after through first micro-structural and distributes, and has promptly formed line source (first light source 10 can be regarded spot light as).These light by each V-shaped groove reflection of first micro-structural will be propagated along the y direction, then by the reflection of the end face of first LGP 31, become along the x direction and will propagate and get into then second LGP 32.
Have second micro-structural on second LGP 32, as shown in Figure 3, second micro-structural is arranged on the bottom surface of second LGP 32.In the present embodiment, second micro-structural is the microprism of a plurality of Discrete Distribution, like microprism 51,52.In the present embodiment, microprism is that the processing base station is made with the 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, inclination angle Φ and interval S 1, can realize different optical effects through adjusting these parameters.Like this, get into second LGP 32 from the light of first LGP 31 after, its each several part will be respectively by each microprism reflection of second micro-structural.For example, light L31 shines microprism 51 backs by microprism 51 reflections, and light L32 shines microprism 52 backs by microprism 52 reflections.This shows, be planar distribution after through second micro-structural, promptly formed area source from the light that wire distributes of being of first LGP 31, and because the machining accuracy of the microprism of second micro-structural is high, so this area source has very high light-emitting uniformity.These will be propagated along the y direction by the light of the microprism of second micro-structural reflection, leave the 32 outside outgoing of second LGP.Because the light of these outgoing has kept good collimation, therefore the LCD of this moment will show as and have less visible angle.Promptly when first light source 10 of opening energy-saving module backlight of the present invention and when closing secondary light source, energy-saving module backlight of the present invention can make LCD have first visible angle, and this first visible angle is ± (5 °-10 °).
When first light source 10 of closing energy-saving module backlight of the present invention and when opening secondary light source, energy-saving module backlight of the present invention can make LCD have second visible angle.As shown in Figure 5, first light source 10 is closed, secondary light source work, and for example the ultraviolet source 21 of secondary light source sends ultraviolet light.This ultraviolet light gets into first LGP 31 and is reflected by the end face of first LGP 31, thereby is coupled into second LGP 32.Based on this law like this, this ultraviolet light is propagated in leading tabula rasa, when running into fluorescent material and apply pattern, with exciting this fluorescent material to apply the fluorescent material of pattern, makes it send white light.It is the fluorescent material application point of a plurality of Discrete Distribution that fluorescent material in the present embodiment applies pattern, is arranged on the bottom surface of second LGP 32 the fluorescent material application point 61,62 shown in Fig. 5 and Fig. 6.Wherein, the ultraviolet lighting of propagating in second LGP 32 has been mapped to fluorescent material application point 61, thereby the fluorescent material in the fluorescent material application point 61 is excited and sends white light, and ultraviolet light does not shine fluorescent material application point 62, thereby fluorescent material application point 62 is not luminous.Fluorescent material applies pattern and is excited the white light that sends from the outside outgoing of the end face of second LGP 32.In other embodiments, fluorescent material applies pattern and also can be arranged on the end face of second LGP 32 the outside outgoing of end face that its white light that sends leaves second LGP 32.Since fluorescent material apply pattern be excited the white light that sends dispersion angle comparatively at random, so the LCD of this moment has bigger visible angle.Promptly when the secondary light source of opening energy-saving module backlight of the present invention and when closing first light source 10, energy-saving module backlight of the present invention can make LCD have 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 need not creative work and just can design according to the present invention make many modifications and variation.Therefore, the technical staff in all present technique field all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. energy-saving module backlight; It is characterized in that; Comprise first light source, secondary light source and LGP member; Make LCD have first visible angle after the said LGP member of the light process outgoing that said first light source sends, make said LCD have second visible angle after the said LGP member of the light process outgoing that said secondary light source sends.
2. energy-saving module backlight as claimed in claim 1, wherein said first visible angle are ± (5 °-10 °).
3. according to claim 1 or claim 2 module energy-saving backlight, wherein said second visible angle is ± (60 °-70 °).
4. energy-saving module backlight as claimed in claim 3, wherein said LGP member comprises first LGP and second LGP; Have first micro-structural on said first LGP, have second micro-structural and fluorescent material on said second LGP and apply pattern; The said light that said first light source sends gets into said first LGP and is reflected by said first micro-structural; Form line source; Get into said second LGP and by said second micro-structural reflection from the light of said line source; Form area source, from the light of said area source from the said second LGP outgoing; The said light that said secondary light source sends gets into second LGP and makes said fluorescent material apply pattern from first LGP and excites to send white light, and said white light is from the said second LGP outgoing.
5. energy-saving module backlight as claimed in claim 4, wherein said LGP member are fabricated structure or integrated overall structure.
6. like claim 3 or 4 described energy-saving modules backlight, wherein said first micro-structural is a plurality of V-shaped grooves, and said second micro-structural is the microprism of a plurality of Discrete Distribution, and it is the fluorescent material application point of a plurality of Discrete Distribution that said fluorescent material applies pattern.
7. energy-saving module backlight as claimed in claim 6; Wherein said first light source is arranged on the side-walls of said first LGP; Said secondary light source is arranged on the below of said first LGP; Said first micro-structural is arranged on the bottom surface of said first LGP, and said second micro-structural is arranged on the bottom surface of said second LGP.
8. energy-saving module backlight as claimed in claim 7; Wherein said fluorescent material applies pattern setting on the said bottom surface of said second LGP or on the end face of said second LGP, and the said white light that sends after said fluorescent material coating pattern is excited is from the said end face outgoing of said second LGP.
9. energy-saving module backlight as claimed in claim 8, wherein said first light source is LED or LASER Light Source.
10. energy-saving module backlight as claimed in claim 9, wherein said secondary light source is a ultraviolet source.
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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN102759051A true CN102759051A (en) | 2012-10-31 |
| CN102759051B CN102759051B (en) | 2015-07-15 |
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| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925524A (en) * | 2014-04-17 | 2014-07-16 | 上海交通大学 | Energy-saving backlight unit with viewing angle adjustable |
| CN106461192A (en) * | 2014-05-30 | 2017-02-22 | 克里公司 | Optical components for luminaire |
| CN108205223A (en) * | 2016-12-20 | 2018-06-26 | 乐金显示有限公司 | Liquid crystal display device |
| CN111176016A (en) * | 2020-01-07 | 2020-05-19 | 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 |
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| 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 |
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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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925524A (en) * | 2014-04-17 | 2014-07-16 | 上海交通大学 | Energy-saving backlight unit with viewing angle adjustable |
| 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 |
| CN106461192A (en) * | 2014-05-30 | 2017-02-22 | 克里公司 | Optical components for luminaire |
| CN106461192B (en) * | 2014-05-30 | 2019-11-19 | 克里公司 | Optical module for lighting apparatus |
| CN108205223A (en) * | 2016-12-20 | 2018-06-26 | 乐金显示有限公司 | Liquid crystal display device |
| CN111176016A (en) * | 2020-01-07 | 2020-05-19 | 京东方科技集团股份有限公司 | Backlight module and 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 |
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| CN102759051B (en) | 2015-07-15 |
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