CN1727960A - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
- Publication number
- CN1727960A CN1727960A CN 200410050986 CN200410050986A CN1727960A CN 1727960 A CN1727960 A CN 1727960A CN 200410050986 CN200410050986 CN 200410050986 CN 200410050986 A CN200410050986 A CN 200410050986A CN 1727960 A CN1727960 A CN 1727960A
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- guide plate
- light guide
- light
- shaped grooves
- angle
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- Light Guides In General And Applications Therefor (AREA)
Abstract
A kind of light guide plate comprises that one is used to accept the incidence surface of incident beam, an exiting surface that light beam is derived and one and this exiting surface opposed bottom surface, and this bottom surface is provided with a plurality of V-shaped grooves; Wherein, these a plurality of V-shaped grooves are the Asymmetric V-type groove.This light guide plate can overcome prior art light guide plate emitting brightness and the lower defective of uniformity coefficient, is mainly used in the liquid crystal indicator.
Description
[technical field]
The invention relates to the backlight module of a kind of light guide plate and this light guide plate of employing, refer to a kind of light guide plate and backlight module that is used for liquid crystal indicator especially.
[background technology]
Because advantages such as the liquid crystal indicator tool is light, thin, power consumption is little are so be widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.But liquid crystal itself is not had a characteristics of luminescence, provides backlight module to realize Presentation Function so be required to be liquid crystal indicator.
The backlight module of prior art comprises light source and light guide plate, and light source is the incidence surface setting of relative light guide plate, 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.
See also Fig. 1, be a kind of prior art backlight module enlarged diagram.This backlight module comprises a light source 10 and a light guide plate 11, this light guide plate 11 comprises an incidence surface 111, a reflecting surface 112 and exiting surface 113 at least, light source 10 is oppositely arranged with the incidence surface 111 of light guide plate 11, and wherein the reflecting surface 112 of light guide plate 11 is a smooth surfaces.
See also Fig. 2, be the prior art backlight module part light path synoptic diagram.Light AB1, the AB2, the AB3 that are sent by light source 10 arrive reflecting surface 112 by the incidence surface 111 of light guide plate 11, by reflecting surface 112 reflections.Reflection ray B1A1 after wherein light AB1 reflects through reflecting surface 112 arrives exiting surface 113, penetrate by light guide plate 11 by refraction, because reflecting surface 112 is a smooth surfaces, when therefore reflection ray B1A1 arrives exiting surface 114, its incident angle is bigger, its probability that total reflection takes place is bigger thus, if its incident angle reached the critical point of satisfying total reflection condition when light B1A1 arrived exiting surface 113, then total reflection can take place in exiting surface 113 places in light B1A1, and light guide plate 11 is that total reflection condition is all satisfied in the zone away from light source on border with light B1A1, light all can produce total reflection phenomenon in this zone, by repeatedly the reflection and total reflection after arrival exiting surface 113 reflect away.And light AB2 and AB3 can directly arrive another reflecting surface 114 through reflecting surface 112 light reflected B2A2 and B3A3, through arriving exiting surface 113 after reflecting surface 114 reflections, thereby cause partly light losing, can't satisfy the requirement of the emitting brightness and the uniformity coefficient of whole light guide plate 11.
Seeing also Fig. 3, is a kind of prior art backlight module synoptic diagram that the United States Patent (USP) of on July 14th, 1998 bulletin is disclosed for the 5th, 779, No. 338.This backlight module comprises a light source 20 and a light guide plate 21, this light guide plate 21 comprises an incidence surface 211, a reflecting surface 212 and an exiting surface 213 at least, light source 20 is oppositely arranged with the incidence surface 211 of light guide plate 21, and wherein the reflecting surface 212 of light guide plate 21 is provided with a plurality of V-shaped grooves 214.
See also Fig. 4, be the prior art backlight module part light path enlarged diagram.Light A ' B1 ', the A ' B2 ', the A ' B3 ' that are sent by light source 20 arrive reflecting surface 212 by the incidence surface 211 of light guide plate 21, and the reflection arrival exiting surface 213 through reflecting surface 212 is penetrated by light guide plate 21 by refraction.Wherein, light source 20 is identical with light source 10 positions in Fig. 2 prior art, and light A ' B1 ', A ' B2 ', A ' B3 ' and light AB1, AB2, AB3 rising angle are all identical.Because reflecting surface 212 is provided with a plurality of V-shaped grooves 214, destroy light and total reflection condition takes place in this reflecting surface 212, thereby light A ' B1 ', A ' B2 ', A ' B3 ' compare as can be known with Fig. 2 prior art through reflecting surface 212 light reflected B1 ' A1 ', B2 ' A2 ', B3 ' A3 ', when it reaches exiting surface 213, its incident angle greatly reduces, thereby its probability that total reflection takes place is smaller, so this backlight module emitting brightness and uniformity coefficient all have greatly and improve.But, because a plurality of V-shaped grooves 214 that the reflecting surface 212 of this light guide plate 21 is provided with all are the v-shaped structures of shape unanimity, when light arrives exiting surface 213 through reflecting surface 212 reflections, also have more away from light source, the rule that its incident angle is big more, thereby, it is high more away from the zone of light source the probability of total reflection to take place more on light guide plate, total reflection phenomenon takes place in this zone in light, causes partly light losing, can't satisfy the requirement of the emitting brightness and the uniformity coefficient of whole light guide plate.
[summary of the invention]
For overcoming light guide plate emitting brightness and the lower defective of uniformity coefficient in the prior art, the invention provides the higher light guide plate of a kind of emitting brightness and uniformity coefficient.
For overcoming backlight module emitting brightness and the lower defective of uniformity coefficient in the prior art, the invention provides a kind of backlight module that adopts above-mentioned light guide plate.
Light guide plate of the present invention comprises that one is used to accept the incidence surface of incident beam, an exiting surface that light beam is derived and one and this exiting surface opposed bottom surface, and this bottom surface is provided with a plurality of V-shaped grooves, and wherein, these a plurality of V-shaped grooves are the Asymmetric V-type groove.
Backlight module of the present invention comprises a light guide plate and a light source, this light guide plate comprises that one is used to accept the incidence surface of incident beam, one exiting surface that light beam is derived and one and this exiting surface opposed bottom surface, this bottom surface is provided with a plurality of V-shaped grooves, the incidence surface of this light source and light guide plate is oppositely arranged, wherein, these a plurality of V-shaped grooves are the Asymmetric V-type groove.
Compared to prior art, because the bottom surface of light guide plate of the present invention is provided with a plurality of V-shaped grooves, and this V-shaped groove is the Asymmetric V-type groove, be that its shape of each V-shaped groove has nothing in common with each other, therefore, can further destroy the condition of incident light generation total reflection, incident light can be further perpendicular to the exiting surface outgoing, thereby can improve the emitting brightness and the uniformity coefficient of light guide plate.
[description of drawings]
Fig. 1 is a kind of prior art backlight module synoptic diagram.
Fig. 2 is the backlight module part light path enlarged diagram of Fig. 1.
Fig. 3 is another kind of prior art backlight module synoptic diagram.
Fig. 4 is the backlight module part light path enlarged diagram of Fig. 3.
Fig. 5 is a backlight module synoptic diagram of the present invention.
Fig. 6 is the backlight module part light path enlarged diagram of Fig. 5.
[embodiment]
See also Fig. 5 and Fig. 6, be the embodiment of backlight module of the present invention.Fig. 5 is a backlight module synoptic diagram of the present invention.This backlight module comprises a light source 30 and a light guide plate 31, this light guide plate 31 comprises at least one incidence surface 311 that is used to accept incident beam, one exiting surface 313 that light beam is derived and one and these incidence surface 311 opposed bottom surface 312, this bottom surface 312 is provided with a plurality of V-shaped grooves 314, these a plurality of V-shaped grooves are continuous distribution, these a plurality of V-shaped grooves are outwards to protrude with respect to light guide plate, and these a plurality of V-shaped grooves 314 are the Asymmetric V-type groove.
Seeing also Fig. 6, is partly light path enlarged diagram of embodiment of the present invention backlight module.As shown in Figure 6, the angle that one side and of each V-shaped groove 314 is parallel to plane (dotted line place) formation of light guide plate exiting surface is α, another side angle of forming of plane therewith is β, and for each independent V-shaped groove 314 its α angle than the more close light source of β angle place.And for whole light guide plate, a plurality of V-shaped grooves 314 plane are therewith formed a plurality of Delta Regions, wherein its α angle of V-shaped groove near the light source place is bigger, the β angle is less, V-shaped groove 314 its α angles away from the light source place are less, and the β angle is bigger, promptly along the direction away from light source, the α angle from large to small, the β angle changes from small to big.The material of this light guide plate 31 is polymer resins, and it can adopt polymer resins such as polyacrylic resin, polyvinyl resin, polymethylmethacrylate and polycarbonate.
Light ab1, the ab2, the ab3 that are sent by light source 30 reach bottom surface 312 by the incidence surface 311 of light guide plate 31, and the reflection arrival exiting surface 313 through bottom surface 312 is penetrated by light guide plate 31 by refraction.Wherein, light source 30 is identical with light source 20 positions with Fig. 4 prior art light source 10 with Fig. 2, and light ab1, ab2, ab3 and light AB1, AB2, AB3 and light A ' B1 ', A ' B2 ', A ' B3 ' rising angle are all identical.Because bottom surface 312 is provided with a plurality of V-shaped grooves 314, these a plurality of V-shaped grooves 314 are asymmetric, and in direction away from light source, its α angle of V-shaped groove from large to small, the β angle changes from small to big, thereby light ab1 is after V-shaped groove 314 reflection near the light source place, and its reflection ray b1a1 more is partial to away from incidence surface 311 1 sides, thereby can improve the emitting brightness and the uniformity coefficient of light guide plate 31.And light ab3 is after the V-shaped groove reflection away from the light source place, it arrives the reflection ray b3a3 of exiting surface 313, its incident angle is compared with prior art littler, more approach vertical exiting surface 313 outgoing, thereby its probability that total reflection takes place is littler, thereby can obtain better emitting brightness and uniformity coefficient away from the light guide plate zone at light source place.And, show by experiment, when its α angle of V-shaped groove at the most close light source place and the ratio of β angle are 4, be 1/4 away from its α angle of V-shaped groove at light source place and the ratio of β angle, all the other V-shaped grooves are pressed in this scope along the direction away from light source, the α angle from large to small, when changing to big rule, this light guide plate emitting brightness and uniformity coefficient are better by little for the β angle.
Wherein, these a plurality of V-shaped grooves also can adopt spaced apart, also can reach the effect that improves light guide plate emitting brightness and uniformity coefficient.And these a plurality of V-shaped grooves are also inwardly recessed with respect to light guide plate, at this moment, its α angle of V-shaped groove near the light source place is less, the β angle is bigger, its α angle of V-shaped groove away from the light source place is less, and the β angle is bigger, i.e. the direction away from light source on the edge, the α angle changes from small to big, and the β angle from large to small.
Claims (10)
1. light guide plate, it comprises that one is used to accept the incidence surface of incident beam, the exiting surface that light beam is derived and one and this exiting surface opposed bottom surface, this bottom surface is provided with a plurality of V-shaped grooves, it is characterized in that: these a plurality of V-shaped grooves are the Asymmetric V-type groove.
2. light guide plate as claimed in claim 1 is characterized in that: these a plurality of V-shaped grooves are continuous distribution.
3. light guide plate as claimed in claim 1 is characterized in that: these a plurality of V-shaped grooves are spaced apart.
4. light guide plate as claimed in claim 1 is characterized in that: the angle that a side and of each V-shaped groove is parallel to the plane formation of light guide plate exiting surface is α, and on the direction away from light source, reduces gradually for its α angle of a plurality of V-shaped grooves.
5. light guide plate as claimed in claim 4 is characterized in that: the angle that another side and of each V-shaped groove is parallel to the plane formation of light guide plate exiting surface is β, and on the direction away from light source, subtracts gradually greatly for its β angle of a plurality of V-shaped grooves.
6. backlight module, it comprises a light guide plate and a light source, this light guide plate comprises exiting surface that an incidence surface that is used to accept incident beam, is derived light beam and one and this exiting surface opposed bottom surface, this bottom surface is provided with a plurality of V-shaped grooves, the incidence surface of this light source and light guide plate is oppositely arranged, and it is characterized in that: these a plurality of V-shaped grooves are the Asymmetric V-type groove.
7. backlight module as claimed in claim 6 is characterized in that: these a plurality of V-shaped grooves are continuous distribution.
8. backlight module as claimed in claim 6 is characterized in that: these a plurality of V-shaped grooves are spaced apart.
9. backlight module as claimed in claim 6 is characterized in that: the angle that a side and of each V-shaped groove is parallel to the plane formation of light guide plate exiting surface is α, and on the direction away from light source, reduces gradually for its α angle of a plurality of V-shaped grooves.
10. backlight module as claimed in claim 9 is characterized in that: the angle that another side and of each V-shaped groove is parallel to the plane formation of light guide plate exiting surface is β, and on the direction away from light source, subtracts gradually greatly for its β angle of a plurality of V-shaped grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410050986XA CN100412647C (en) | 2004-07-31 | 2004-07-31 | Plate of guiding light and back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410050986XA CN100412647C (en) | 2004-07-31 | 2004-07-31 | Plate of guiding light and back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1727960A true CN1727960A (en) | 2006-02-01 |
| CN100412647C CN100412647C (en) | 2008-08-20 |
Family
ID=35927319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410050986XA Expired - Fee Related CN100412647C (en) | 2004-07-31 | 2004-07-31 | Plate of guiding light and back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100412647C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103403441A (en) * | 2012-03-09 | 2013-11-20 | 欧姆龙株式会社 | Surface light source device |
| WO2016082248A1 (en) * | 2014-11-26 | 2016-06-02 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module and display |
| JP2017083865A (en) * | 2011-04-15 | 2017-05-18 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| CN110501844A (en) * | 2019-08-27 | 2019-11-26 | 上海中航光电子有限公司 | A kind of preparation method of backlight module, display device and backlight module |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08262234A (en) * | 1995-03-22 | 1996-10-11 | Casio Comput Co Ltd | Illumination device |
| JPH10208529A (en) * | 1997-01-20 | 1998-08-07 | Minebea Co Ltd | Sheet type light source device |
| US6295104B1 (en) * | 1998-05-26 | 2001-09-25 | Minebea Co., Ltd. | Front illuminating system with layer between light guide and LCD |
| JP2003257229A (en) * | 2002-02-27 | 2003-09-12 | Alps Electric Co Ltd | Backlight, front light, and liquid crystal display device |
| CN2567608Y (en) * | 2002-09-11 | 2003-08-20 | 三和企业股份有限公司 | Improved structure of light board |
-
2004
- 2004-07-31 CN CNB200410050986XA patent/CN100412647C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017083865A (en) * | 2011-04-15 | 2017-05-18 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| CN103403441A (en) * | 2012-03-09 | 2013-11-20 | 欧姆龙株式会社 | Surface light source device |
| WO2016082248A1 (en) * | 2014-11-26 | 2016-06-02 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module and display |
| CN110501844A (en) * | 2019-08-27 | 2019-11-26 | 上海中航光电子有限公司 | A kind of preparation method of backlight module, display device and backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100412647C (en) | 2008-08-20 |
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| PB01 | Publication | ||
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Granted publication date: 20080820 Termination date: 20160731 |