CN103267244B - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN103267244B CN103267244B CN201210224023.1A CN201210224023A CN103267244B CN 103267244 B CN103267244 B CN 103267244B CN 201210224023 A CN201210224023 A CN 201210224023A CN 103267244 B CN103267244 B CN 103267244B
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- light
- guide plate
- backlight module
- light guide
- diaphragm
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- 238000009792 diffusion process Methods 0.000 claims description 25
- 230000004888 barrier function Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 11
- -1 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 238000000605 extraction Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 235000014698 Brassica juncea var multisecta Nutrition 0.000 description 1
- 241000254158 Lampyridae Species 0.000 description 1
- 241000251184 Rajiformes Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000379 polypropylene carbonate Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module, comprising: a light source; the light guide plate is arranged on one side of the light emitting surface of the light source; the light guide plate includes: the light incident surface, the bottom surface, the light emergent surface and the boss part; the light incident surface is used for guiding light rays to enter the light guide plate; the bottom surface is intersected with the light incident surface and used for reflecting light rays entering the light guide plate; the light emitting surface is opposite to the bottom surface and used for emitting light out of the light guide plate and the boss part; the boss part comprises a first surface and a second surface, the first surface is intersected with the light incident surface and is opposite to the bottom surface, the second surface is inclined to the bottom surface and connects the first surface with the light emergent surface, and the height between the bottom surface and the first surface is greater than the height between the bottom surface and the light emergent surface; and the diaphragm is arranged on the light emergent surface and comprises an inclined part, the inclined part extends along the second surface, and the inclined part is provided with a reflecting layer. The backlight module can reduce poor light leakage and increase the light emitting efficiency of the backlight module.
Description
Technical field
The present invention relates to flat panel display, particularly a kind of backlight module.
Background technology
Usually, liquid crystal indicator (Liquid Crystal Display, LCD) comprises the backlight module and the response light that provides of backlight module that produce light and shows the display panels of image.
As shown in Figure 1, traditional backlight module comprises: a light source 101, the light guide plate 102 being placed in described light source 101 light-emitting area side, the diffusion barrier 103 be placed in described light guide plate 102, the first brightness enhancement film 104 and the second brightness enhancement film 105 be placed on described diffusion barrier 103.
Wherein, described light guide plate 102 comprises: incidence surface 106, bottom surface 107, exiting surface 108 and projection section 109; Described incidence surface 106 enters described light guide plate 102 for the light guiding described light source 101 and send; Described bottom surface 107 is crossing with described incidence surface 106, for reflecting the light entering described light guide plate 102; Described exiting surface 108 is relative with described bottom surface 107, for light emission being gone out light guide plate 102 and projection section 109; Described projection section 109 comprises first surface 110 and second surface 111, described first surface 110 is crossing with described incidence surface 106 and relative with described bottom surface 107, described second surface 111 favours described bottom surface 107 and is connected with described exiting surface 108 by described first surface 110, and the height between described bottom surface 107 and described first surface 110 is greater than the height between bottom surface 107 and exiting surface 108.
The light sent due to described light source 101 is through the multiple reflections of incidence surface 106, bottom surface 107 and exiting surface 108, light can penetrate from exiting surface 108 and projection section 109, the light wherein penetrated from projection section 109 can wear the display panels be placed on backlight module, final generation light leak bad (bad also known as firefly).
Bad in order to reduce above-mentioned light leak, shading rubber belt 112 is added in described backlight module, described shading rubber belt 112 is positioned on the first surface 110 of described projection section 109, and part is overlapped on described second brightness enhancement film 105 on the side of described light source 101, for blocking the light penetrated from projection section 109.Although shading rubber belt 112 has blocked the most of light penetrated from projection section 109, shading rubber belt can not block the light slanting out from the second surface of projection section 109, and it is bad that this part light still can produce light leak.And, because a lot of light blocks by shading rubber belt 112, the light extraction efficiency of backlight module also can be caused to decline.
For this reason, be necessary to develop a kind of backlight module can more effective reduction light leak bad, the light extraction efficiency of backlight module can not be lost simultaneously.
Summary of the invention
The invention provides a kind of backlight module, solve the problem that light leak is bad, while effective reduction light leak is bad, improve light extraction efficiency.
For solving the problems of the technologies described above, the invention provides a kind of backlight module, comprising:
One light source;
One light guide plate, described light guide plate is placed in the side in described light source luminescent face; Described light guide plate comprises: incidence surface, bottom surface, exiting surface and projection section; Described incidence surface enters described light guide plate for the light guiding described light source and send; Described bottom surface is crossing with described incidence surface, for reflecting the light entering described light guide plate; Described exiting surface is relative with described bottom surface, for light emission is gone out light guide plate and projection section; Described projection section comprises first surface and second surface, described first surface is crossing with described incidence surface and relative with described bottom surface, described second surface favours described bottom surface and is connected with described exiting surface by described first surface, and the height between described bottom surface and described first surface is greater than the height between bottom surface and exiting surface; And
One diaphragm, be placed on described exiting surface, described diaphragm comprises a rake, and described rake extends along described second surface, and described rake is provided with reflection horizon.
Optionally, the length of the rake of described diaphragm is less than the tilt length of described second surface.
Optionally, the length of the rake of described diaphragm is at least 3/4 of the tilt length of described second surface.
Optionally, described reflection horizon is positioned at the rake of described diaphragm on the surface of described light guide plate.
Optionally, on the surface of rake away from described light guide plate that described reflection horizon is positioned at described diaphragm.
Optionally, described diaphragm is diffusion barrier.
Optionally, described diffusion barrier comprises:
Base material;
Be coated in described base material away from the diffusion layer on the surface of described light guide plate; And
Be coated in the separation layer of described base material on the surface of described light guide plate.
Optionally, the separation layer of the rake of described diaphragm is replaced by reflection horizon.
Optionally, the diffusion layer of the rake of described diaphragm is replaced by reflection horizon.
Optionally, the material in described reflection horizon is the one in polyethylene terephthalate, polypropylene, polycarbonate.
Optionally, described backlight module also comprises:
At least one brightness enhancement film, described brightness enhancement film is positioned on described diaphragm; And
Shading rubber belt, described shading rubber belt covers on the first surface with described projection section, and extends along described first surface direction and be partly overlapped on described brightness enhancement film on the side of described light source.
Optionally, described light source is LED light source or cold-cathode tube light source.
The present invention is provided with reflection horizon on the rake of described diaphragm, described rake extends along described second surface, such reflection horizon is just indirectly positioned on second surface, and the light from second surface outgoing has been blocked in reflection horizon, avoids the appearance that light leak is bad; Meanwhile, the light back from second surface outgoing can return in light guide plate by reflection horizon, then can penetrate from exiting surface after the multiple reflections of light guide plate, thus can improve the light extraction efficiency of backlight module.
Accompanying drawing explanation
Fig. 1 is the sectional view of traditional backlight module;
Fig. 2 is the sectional view of the backlight module of one embodiment of the invention;
Fig. 3 is the enlarged diagram of the diffusion barrier of the backlight module of one embodiment of the invention;
Fig. 4 is the diffusion barrier of the backlight module of one embodiment of the invention and the enlarged diagram in reflection horizon;
Fig. 5 is the diffusion barrier of the backlight module of another embodiment of the present invention and the enlarged diagram in reflection horizon.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly, elaborate further below in conjunction with accompanying drawing.
Core concept of the present invention is, the diaphragm of the backlight provided has rake, rake is positioned on the second surface of light guide plate projection section, described rake is provided with reflection horizon, the light reflection slanting out from projection section can be returned light guide plate by the reflection horizon be positioned on the rake on second surface, avoid on the one hand the light leak that oblique fire light out causes bad, on the other hand because the light reflection penetrated from projection section is returned light guide plate, this part light can enter exiting surface through the multiple reflections of light guide plate, thus adds light extraction efficiency.
Concrete as shown in Figure 2, the backlight module 200 in the present embodiment comprises a light source 201 and is placed in the light guide plate 202 of side of described light source 201 light-emitting area.
Described light source 201 is LED light source or cold-cathode tube light source, can select according to actual needs.
Described light guide plate 202 comprises: incidence surface 203, bottom surface 204, exiting surface 205 and projection section 206; Described incidence surface 203 enters described light guide plate 202 for the light guiding described light source 201 and send; Described bottom surface 204 is crossing with described incidence surface 203, for reflecting the light entering described light guide plate 202; Described exiting surface 205 is relative with described bottom surface 204, for light emission being gone out light guide plate 202 and projection section 206.Described projection section 206 comprises first surface 207 and second surface 208, described first surface 207 is crossing with described incidence surface 203 and relative with described bottom surface 204, described second surface 208 favours described bottom surface 204 and is connected with described exiting surface 205 by described first surface 207, and the height between described bottom surface 204 and described first surface 207 is greater than the height between bottom surface 204 and exiting surface 205.
Described backlight module 200 also comprises: diaphragm 209, first brightness enhancement film 212, second brightness enhancement film 213 and shading rubber belt 214.Described diaphragm 209 is placed on described exiting surface 205, and described diaphragm 209 comprises a rake 210, and described rake 210 extends along described second surface 208, and described rake 210 is provided with reflection horizon 215.Described first brightness enhancement film 212 is positioned on described diaphragm 209, described second brightness enhancement film 213 is positioned in described first brightness enhancement film 212, described shading rubber belt 214 is covered on the first surface 207 of described projection section 206, and extends along the direction of first surface 207 and be partly overlapped on described second brightness enhancement film 213 on the side of described light source 201.The light from second surface 208 outgoing can be blocked in described reflection horizon 215, returns in light guide plate 202 by the light back from second surface 208 outgoing simultaneously, then can penetrate from exiting surface 205 after the multiple reflections of light guide plate 202.
In order to ensure the assembling capacity of diaphragm 209 and light guide plate 202, the length of the rake 210 of described diaphragm 209 is less than the tilt length of described second surface 208.Meanwhile, best in order to ensure the occlusion effect of 215 pairs of second surface 208 emergent raies in reflection horizon, the length of described rake 210 is at least 3/4 of the tilt length of described second surface 208.
In the present embodiment, diaphragm 209 is for having the diffusion barrier of a rake, and as shown in Figure 3, described diaphragm 209 comprises: base material 209a, diffusion layer 209b and separation layer 209c.Described diffusion layer 209b is coated in the one side of described base material 209a, and described separation layer 209c is coated on the another side of described base material 209a, and the one side of described base material 209a is away from the surface of described light guide plate 202; The another side of described base material 209a is near the surface of described light guide plate 202.The rake 210 of described diaphragm 209 extends along described second surface 208.
As shown in Figure 4, directly reflection horizon 215 can be coated in rake 210 on the surface of described light guide plate 202, that is, reflection horizon 215 be directly coated on the surface of separation layer 209c.Certainly, also directly reflection horizon 215 can be coated on the surface of rake 210 away from described light guide plate 202, that is, reflection horizon 215 be directly coated on the surface of diffusion layer 209b.Shown in Fig. 4 is situation about being directly coated in reflection horizon 215 on the surface of separation layer 209c.
Or, as shown in Figure 5, in another embodiment of the invention, the diffusion layer 209b of the rake 210 of described diaphragm 209 also can directly be replaced by reflection horizon 215, also or the separation layer 209c of rake 210 is directly replaced by reflection horizon 215, shown in Fig. 5 is the situation that the separation layer 209c of the rake of diaphragm 209 is replaced by reflection horizon 215.No matter be replace diffusion layer 209b by reflection horizon 215 or replace separation layer 209c, the manufacturing process in reflection horizon 215 can be integrated directly in existing diffusion barrier manufacture craft, do not need to increase extra technique to complete reflection horizon.Further, the production technology of diffusion barrier is very ripe, therefore just can ensure that high yield is large batch of and produce above-mentioned diaphragm, and does not need to increase extra input.
Wherein, the material in described reflection horizon 215 is one or more in polyethylene terephthalate, polypropylene or polycarbonate.
The manufacturing process in described reflection horizon can be in the production procedure of diffusion barrier, also after completing diffusion barrier manufacture craft, can apply reflection horizon again, and that can select reflection horizon according to actual needs flexibly completes mode.
It should be noted that, above-mentioned is introduce the present invention in detail for two brightness enhancement film (first brightness enhancement film 212 and the second brightness enhancement film 213), but will be appreciated that, in order to optimize the optical effect of backlight module, described backlight module 200 can also comprise more brightness enhancement film.
In addition; along with the deflation day by day of backlight module space structure; develop a kind of by the composite membrane of brightness enhancement film together with the Function Integration Mechanism of diffusion barrier; thus; the composite membrane that above-mentioned brightness enhancement film and diffusion sheet can be combined as diaphragm of the present invention, also or directly using brightness enhancement film as diaphragm of the present invention, as long as it has rake; and described rake has reflection horizon and can realize object of the present invention, all in protection scope of the present invention.
In sum, the present invention arranges reflection horizon on the rake 210 of diaphragm 209, and such reflection horizon is just indirectly positioned on second surface 208, and the light from second surface 208 outgoing has been blocked in reflection horizon, avoids the appearance that light leak is bad.Meanwhile, the light back from second surface 208 outgoing can return in light guide plate 202 by reflection horizon, then can penetrate from exiting surface 205 after the multiple reflections of light guide plate 202, thus can improve the light extraction efficiency of backlight module.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. a backlight module, comprising:
One light source;
One light guide plate, described light guide plate is placed in the side in described light source luminescent face; Described light guide plate comprises: incidence surface, bottom surface, exiting surface and projection section; Described incidence surface enters described light guide plate for the light guiding described light source and send; Described bottom surface is crossing with described incidence surface, for reflecting the light entering described light guide plate; Described exiting surface is relative with described bottom surface, for light emission is gone out light guide plate and projection section; Described projection section comprises first surface and second surface, described first surface is crossing with described incidence surface and relative with described bottom surface, described second surface favours described bottom surface and is connected with described exiting surface by described first surface, and the height between described bottom surface and described first surface is greater than the height between bottom surface and exiting surface;
One diaphragm, be placed on described exiting surface, described diaphragm comprises a rake, and described rake extends along described second surface, and described rake is provided with reflection horizon; And
Shading rubber belt, described shading rubber belt is covered on the first surface of described projection section, and extends along described first surface direction and be positioned on described diaphragm.
2. backlight module as claimed in claim 1, it is characterized in that, the length of the rake of described diaphragm is less than the tilt length of described second surface.
3. backlight module as claimed in claim 2, it is characterized in that, the length of the rake of described diaphragm is at least 3/4 of the tilt length of described second surface.
4. backlight module as claimed in claim 1, it is characterized in that, described reflection horizon is positioned at the rake of described diaphragm on the surface of described light guide plate.
5. backlight module as claimed in claim 1, is characterized in that, on the surface of the rake that described reflection horizon is positioned at described diaphragm away from described light guide plate.
6. backlight module as claimed in claim 1, it is characterized in that, described diaphragm is diffusion barrier.
7. backlight module as claimed in claim 6, it is characterized in that, described diffusion barrier comprises:
Base material;
Be coated in described base material away from the diffusion layer on the surface of described light guide plate; And
Be coated in the separation layer of described base material on the surface of described light guide plate.
8. backlight module as claimed in claim 7, it is characterized in that, the separation layer of the rake of described diaphragm is replaced by reflection horizon.
9. backlight module as claimed in claim 7, it is characterized in that, the diffusion layer of the rake of described diaphragm is replaced by reflection horizon.
10. backlight module as claimed in claim 1, it is characterized in that, the material in described reflection horizon is the one in polyethylene terephthalate, polypropylene, polycarbonate.
11. backlight modules as claimed in claim 1, it is characterized in that, described backlight module also comprises:
At least one brightness enhancement film, described brightness enhancement film is positioned on described diaphragm; Described shading rubber belt extends along described first surface direction and part is overlapped on described brightness enhancement film on the side of described light source.
12. backlight modules as claimed in claim 1, is characterized in that, described light source is LED light source or cold-cathode tube light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210224023.1A CN103267244B (en) | 2012-06-29 | 2012-06-29 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210224023.1A CN103267244B (en) | 2012-06-29 | 2012-06-29 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103267244A CN103267244A (en) | 2013-08-28 |
| CN103267244B true CN103267244B (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210224023.1A Active CN103267244B (en) | 2012-06-29 | 2012-06-29 | Backlight module |
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| CN (1) | CN103267244B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913245B (en) * | 2015-06-08 | 2018-04-27 | 武汉华星光电技术有限公司 | A kind of high colour gamut backlight module and display device |
| CN112485939A (en) * | 2020-12-04 | 2021-03-12 | 深圳市瀚达美电子有限公司 | Integrated vehicle-mounted display with atmosphere lamp module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201210211Y (en) * | 2008-06-16 | 2009-03-18 | 亚通光电科技(深圳)有限公司 | Back light module having wedge light conducting structure |
| CN202057826U (en) * | 2011-05-24 | 2011-11-30 | 深圳市德仓科技有限公司 | Light guide plate and thin type backlight module group |
| CN202118710U (en) * | 2011-07-01 | 2012-01-18 | 北京京东方光电科技有限公司 | Side-lighting backlight module and liquid crystal display |
-
2012
- 2012-06-29 CN CN201210224023.1A patent/CN103267244B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201210211Y (en) * | 2008-06-16 | 2009-03-18 | 亚通光电科技(深圳)有限公司 | Back light module having wedge light conducting structure |
| CN202057826U (en) * | 2011-05-24 | 2011-11-30 | 深圳市德仓科技有限公司 | Light guide plate and thin type backlight module group |
| CN202118710U (en) * | 2011-07-01 | 2012-01-18 | 北京京东方光电科技有限公司 | Side-lighting backlight module and liquid crystal display |
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| CN103267244A (en) | 2013-08-28 |
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