CN1591121A - Backlight module - Google Patents
Backlight module Download PDFInfo
- Publication number
- CN1591121A CN1591121A CNA031403573A CN03140357A CN1591121A CN 1591121 A CN1591121 A CN 1591121A CN A031403573 A CNA031403573 A CN A031403573A CN 03140357 A CN03140357 A CN 03140357A CN 1591121 A CN1591121 A CN 1591121A
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- China
- Prior art keywords
- light
- backlight
- guide plate
- light guide
- monochromatic
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Abstract
The present invention discloses a backlight module. Said backlight module. includes several single-colour backlight plates, every single-colour backlight plate includes light-conducting plate and at least one single-colour light source, and said light-exiting surface, the light beam emitted by said at least on single-colour backlight plates are superimposed so as to produce required display colour. Said invention has extensive application range, can be used for making plane display, general optical illumination and signboard, etc.
Description
[technical field]
The present invention relates to a kind of backlight liquid crystal display module that is applied to.
[background technology]
Because advantages such as LCD has gently, approaches, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because liquid crystal itself does not have the characteristics of luminescence, need provide module backlight to realize Presentation Function for it.Module backlight need have higher bright dipping briliancy, thereby promotes the visible angle of color contrast, full frame regional luminance effect and the complete machine of the LCD that adopts this module backlight.
Prior art module backlight comprises light source and light guide plate, the light entrance face setting of the relative light guide plate of light source, and the transmission direction that this light-guide plate guides is sent light beam from light source converts line source or pointolite to the area source outgoing.The general at present light source that adopts white light-emitting diode as the white backlight module according to the transmitance of white light, is adjusted the main color of colored filter, makes LCD can realize that multicolour shows.But the price of white light-emitting diode is very expensive, causes the cost of module backlight and even LCD high, and product is difficult to be accepted by market.In addition, when adopting white light-emitting diode to serve as light source, coupling efficiency is low, be that light source is difficult to efficiently be coupled into light guide plate, cause the bright dipping briliancy of module backlight low, for reaching required briliancy, need to adopt a plurality of white light-emitting diodes, further cause the increase of cost.
A kind of prior art module backlight can be consulted Fig. 1, and it is disclosed in No. the 535th, 916, the TaiWan, China patent of on June 1st, 2003 bulletin.This module backlight comprises light-passing board 12 and green, blue two kinds of light sources (only showing one among the figure).This light-passing board 12 removes entrance port 124, outgoing plane 125 is outside the flat surface, be provided with reflective thing 123 in remaining surface, and has a surface 121 in these surfaces at least for recessed, protruding injustice, make and be located at the green of 124 places, entrance port, the light that is sent during two kinds of light source energized of indigo plant, after in entering light-passing board 12, can be recessed by these, the reflection of protruding not plane surface 121, in this light-passing board 12, produce irregular diffraction, with green, blue two kinds of coloured light are uniformly mixed into white light, penetrate by outgoing plane 125 fifty-fifty then, so that a kind of module backlight that can evenly distribute white light to be provided.
But, the prior art module backlight adopts green, blue two kinds of coloured light to be uniformly mixed into white light, has following defective: at first, because self heterochromia of green, blue two kinds of light sources, make the lack of homogeneity of color distribution, can obviously feel the graded of color at outgoing plane 125; Secondly, because the coupling efficiency differences of green, blue two kinds of light sources, green for making, blue two kinds of coloured light evenly mix, and the designing requirement of plane surface 121 is not higher to the entrance port 124 of this light-passing board 12 and concave, convex, and it is made very be difficult; Once more, the design of prior art light-passing board 12, green, the blue two kinds of light sources of high-level efficiency coupling simultaneously cause the overall color briliancy of module backlight to reduce.
[summary of the invention]
Make difficulty, defective that source-coupling efficiency is low in order to overcome prior art module backlight, the invention provides and a kind ofly be easy to make and module backlight that source-coupling efficiency is high.
The technical scheme of technical solution problem of the present invention is: a kind of module backlight is provided, comprise a plurality of monochromatic backlight, each monochromatic backlight includes light guide plate and at least one monochromatic source, this light guide plate comprise light-emitting face and with the light-emitting face opposed bottom surface, this at least one monochromatic source emitted light beams is converted to area source via light guide plate, and these a plurality of monochromatic backlight coincide mutually and produce required display color.
The invention has the beneficial effects as follows: adopt white light-emitting diode or adopt a plurality of different monochromatic sources to cooperate a light-passing board to compare with prior art white backlight module, the present invention's module backlight utilizes a plurality of monochromatic backlight stack combinations, because each monochromatic backlight adopts monochromatic source and light guide plate respectively, be easy to by design or via the mode of surface coupling diffraction structure, different coloured light high-level efficiency is coupled into light guide plate and ejaculation, be that the present invention's module backlight is easy to make and the coupling efficiency height, thereby can reduce the total number of the light source that adopts, reduce the whole cost of module backlight and even LCD.In addition, light the number of monochromatic backlight, can reach the function of white backlight module, arbitrarily the conversion display color by change.
[description of drawings]
Fig. 1 is the part section enlarged diagram of a kind of prior art module backlight.
Fig. 2 is the stereographic map of the present invention's module first embodiment backlight.
Fig. 3 is the lateral plan of module backlight shown in Figure 2.
Fig. 4 is the stereographic map of the present invention's module second embodiment backlight.
Fig. 5 is the stereographic map of the present invention's module the 3rd embodiment backlight.
[embodiment]
Seeing also Fig. 2, is the present invention's module first embodiment backlight.This module 200 backlight comprises first, second, third monochromatic backlight (not indicating), and this three monochromatic backlight stack is to produce required display color.Wherein, the first monochromatic backlight comprises that first light guide plate 210 and blue dot light source 201, the second monochromatic backlight comprise that second light guide plate 220 and green pointolite 202, the three monochromatic backlight comprise the 3rd light guide plate 230 and red pointolite 203.
This blue dot light source 201 sends blue light beam, and the transmission direction that these first light guide plate, 210 these blue dot light sources 201 of guiding send light beam is converted into the area source outgoing.This blue dot light source 201 can be a blue LED, also can adopt blue laser diode to increase the briliancy of color.
This first light guide plate 210 is plate shaped light guide plate, adopt transparent materials such as acryl, glass or polycarbonate to make, it comprise a light entrance face 211, the light-emitting face 212 that links to each other with light entrance face 211 and with light-emitting face 212 opposed bottom surface (sign).
This light entrance face 211 receives the light beam that blue dot light source 201 sends, and the zone of the light beam that coupling blue dot light source 201 sends on it can be provided with anti-reflective film (figure does not show), to improve the light beam utilization factor, further strengthens coupling efficiency.
See also Fig. 3, this light-emitting face 212 can be processed into the uneven surface with certain roughness, has scattering perturbed structure 240 on it, to promote the homogeneity from light-emitting face 212 outgoing beams.
This second light guide plate 220 and the 3rd light guide plate 230 cooperate green pointolite 202 and red pointolite 203 respectively, and the Beam Transformation that green pointolite 202 and red pointolite 203 are sent is an area source.This green pointolite 202 and red pointolite 203 can be light emitting diode or laser diode.
This second light guide plate 220 comprises the light entrance face 221 of the light beam that receives green pointolite 202, link to each other with light entrance face 221 and the light-emitting face 222 of the bottom surface of contiguous first light guide plate 210 and with light-emitting face 222 opposed bottom surface (indicating), have scattering perturbed structure 240 on this light-emitting face 222.
The 3rd light guide plate 230 comprises the light entrance face 231 of the light beam that receives red pointolite 203, link to each other with light entrance face 231 and the light-emitting face 232 of the bottom surface of contiguous second light guide plate 220 and with light-emitting face 232 opposed bottom surface 233, have scattering perturbed structure 240 on this light-emitting face 222.The bottom surface 233 of the 3rd light guide plate 230 is provided with a plurality of sites (figure does not show), to improve the briliancy and the homogeneity of the 3rd light guide plate 230 outgoing red beams.The size of this site can increase progressively along the direction away from light entrance face 231, also can be evenly distributed on the bottom surface of the 3rd light guide plate 230, and it can be cylindric, spherical shape, square, pyramid or other suitable shape.This site can be distributed in the bottom surface 233 of the 3rd light guide plate 230 by modes such as printing or ejection formations.In addition, also can be 233 a plurality of V-shaped grooves (figure does not show) be set in the bottom surface.The bottom surface 233 of the 3rd light guide plate 230 can be provided with reflectance coating (figure does not show), and this reflectance coating is by SiO
2With TiO
2Replace the multilayer film that form, make projection beam reflection thereon, select from the bottom surface 233 of the 3rd light guide plate 230, thereby reduce the energy loss of light beam, improve the whole optical property of the 3rd light guide plate 230 and module backlight 200 to prevent light beam.This reflectance coating can adopt methods such as chemical vapour deposition technique, electron beam evaporation plating method, sputtering method to form, and its reflectivity at visible region can reach more than 98%.
See also Fig. 2 and Fig. 3, adopt sept 250 at interval and superimposed between this three monochromatic backlight, during work, point sapphirine, green and red pointolite 201,202 and 203, because three monochromatic backlight are superimposed, make module 200 backlight can give out uniform white light, reach the function of prior art white backlight module.Owing to adopt monochromatic source, be easy to by design or via the mode of surface coupling diffraction structure, different coloured light high-level efficiency is coupled into light guide plate and penetrates, i.e. the present invention module 200 backlight is easy to make and the coupling efficiency height.In addition, light the number of monochromatic backlight, arbitrarily the conversion display color by change.Light and shade conversion by light source between each monochromatic backlight is easy to produce neon effect and marquee effect.
Certainly, the above is an embodiment of the present invention's module backlight, and the present invention can also have other improvement or replacement.For example, for strengthening the bright dipping briliancy and the uniformity coefficient of module 200 backlight, diffuser plate and prismatic lens (figure does not show) can be set between first light guide plate 210 and second light guide plate 220, second light guide plate 220 and the 3rd light guide plate 230 further.
Seeing also Fig. 4, is the present invention's module second embodiment backlight, and this module 300 backlight comprises first and second monochromatic backlight (not indicating), and this two monochromatic backlight stack is to produce required display color.Wherein, the first monochromatic backlight, the second monochromatic backlight comprise first light guide plate 310 and two green pointolites 301, second light guide plate 320 and two red pointolites 302 respectively.
This first light guide plate 310 is identical with second light guide plate, 320 structures, all is plate shaped light guide plate, can certainly adopt the wedge shape light guide plate.This first light guide plate 310 comprises a light entrance face 311, light-emitting face 312 and bottom surface (indicate), second light guide plate 320 comprise light entrance face 321, with the adjacent light-emitting face 322 and the bottom surface 323, bottom surface of first light guide plate 310.
This light entrance face 311 and 321 receives the light beam that green pointolite 301 and red pointolite 302 send respectively, the zone of the light beam that green pointolite 301 of coupling and red pointolite 301 send on it is provided with circular groove 319 and 329 respectively, and all has a determining deviation between adjacent circular groove 319 and 329.Certainly, this groove also can be a triangle or trapezoidal, and a plurality of grooves of same light guide plate can be provided with and distance continuously continuously.The bottom surface 323 of this second light guide plate 320 and the bottom surface of first light guide plate 310 can be provided with vaporificly picks flower or texture (figure do not show) with the total reflection condition of broken beam, promotes the uniformity coefficient of module 300 light beam outgoing backlight.These bottom surface 323 plating reflectance coatings (figure does not show) prevent light beam 323 effusions from the bottom surface with reflection projection light beam thereon, increase the bright dipping briliancy of module 300 backlight.
Seeing also Fig. 5, is the present invention's module the 3rd embodiment backlight.This module 400 backlight comprises first, second monochromatic backlight (not indicating) and reflecting plate 430, and this two monochromatic backlight stack is to produce required display color.Wherein, the first monochromatic backlight, the second monochromatic backlight comprise first light guide plate 410 and two green pointolites 401, second light guide plate 420 and two red pointolites 402 respectively.
This green pointolite 401 is green LEDs, and the peak value scope of its wavelength is between between the 470nm to 540nm, and this redness pointolite 402 is red light emitting diodes, and the peak value scope of its wavelength is between between the 600nm to 660nm.
This first light guide plate 410 is identical with second light guide plate, 420 structures, and first light guide plate 410 comprises light-emitting face 412 and bottom surface (not indicating), and second light guide plate 420 comprises light-emitting face 422 adjacent with the bottom surface of first light guide plate 410 and bottom surface 423.
First light guide plate 410 and second light guide plate, 420 1 short brinks are provided with a pair of caulking groove (not indicating) respectively, and this caulking groove is taken in green pointolite 401 of fixing and red pointolite 402.The bottom surface 423 1 side settings of this reflecting plate 430 contiguous second light guide plate 420 423 are overflowed from the bottom surface to prevent light beam, thereby increase the bright dipping briliancy of module 400 backlight.
Claims (10)
1. module backlight, it is characterized in that: it comprises a plurality of monochromatic backlight, these a plurality of monochromatic backlight are superimposed and produce required display color, each monochromatic backlight includes light guide plate and at least one monochromatic source, this light guide plate comprise light-emitting face and with the light-emitting face opposed bottom surface, the monochromatic source emitted light beams is converted to area source via light guide plate.
2. module backlight as claimed in claim 1 is characterized in that: this at least one monochromatic source is red light source, blue-light source or green light source.
3. module backlight as claimed in claim 2 is characterized in that: this at least one monochromatic source is light emitting diode or laser diode.
4. module backlight as claimed in claim 1 is characterized in that: superimposed by the sept interval between the monochromatic backlight.
5. module backlight as claimed in claim 1 is characterized in that: this light guide plate comprises light entrance face, and the be coupled zone of at least one monochromatic source of this light entrance face is provided with groove.
6. module backlight as claimed in claim 1 is characterized in that: the caulking groove of this at least one monochromatic source is accommodated in this light guide plate one short brink setting.
7. module backlight as claimed in claim 1 is characterized in that: the light-emitting face of this light guide plate has the scattering perturbed structure.
8. module backlight as claimed in claim 1 is characterized in that: the bottom surface plating reflectance coating of at least one light guide plate.
9. module backlight as claimed in claim 1 is characterized in that: it also comprises reflecting plate, and the bottom surface of the contiguous light guide plate of this reflecting plate is provided with.
10. module backlight as claimed in claim 1 is characterized in that: diffuser plate and prismatic lens are set between the adjacent light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031403573A CN1591121A (en) | 2003-08-28 | 2003-08-28 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031403573A CN1591121A (en) | 2003-08-28 | 2003-08-28 | Backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1591121A true CN1591121A (en) | 2005-03-09 |
Family
ID=34597338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031403573A Pending CN1591121A (en) | 2003-08-28 | 2003-08-28 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1591121A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373557B (en) * | 2007-08-24 | 2010-08-11 | 凌阳多媒体股份有限公司 | Positioning system and control system of remote control coordinate and display apparatus thereof |
| CN101609230B (en) * | 2008-06-18 | 2011-12-14 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN102707368A (en) * | 2012-05-23 | 2012-10-03 | 天津大学 | Light guide plate with embedded diffraction element |
| CN103591509A (en) * | 2013-11-08 | 2014-02-19 | 京东方科技集团股份有限公司 | Backlight source and display device |
| CN113156706A (en) * | 2021-04-30 | 2021-07-23 | 武汉华星光电技术有限公司 | Backlight module and display device |
-
2003
- 2003-08-28 CN CNA031403573A patent/CN1591121A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373557B (en) * | 2007-08-24 | 2010-08-11 | 凌阳多媒体股份有限公司 | Positioning system and control system of remote control coordinate and display apparatus thereof |
| CN101609230B (en) * | 2008-06-18 | 2011-12-14 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN102707368A (en) * | 2012-05-23 | 2012-10-03 | 天津大学 | Light guide plate with embedded diffraction element |
| CN102707368B (en) * | 2012-05-23 | 2014-02-19 | 天津大学 | Light guide plate with embedded diffraction element |
| CN103591509A (en) * | 2013-11-08 | 2014-02-19 | 京东方科技集团股份有限公司 | Backlight source and display device |
| US9651204B2 (en) | 2013-11-08 | 2017-05-16 | Boe Technology Group Co., Ltd. | Backlight and display device having the same |
| CN113156706A (en) * | 2021-04-30 | 2021-07-23 | 武汉华星光电技术有限公司 | Backlight module and display device |
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