CN1501138A - Light transmitting board for backlight module - Google Patents
Light transmitting board for backlight module Download PDFInfo
- Publication number
- CN1501138A CN1501138A CNA021520178A CN02152017A CN1501138A CN 1501138 A CN1501138 A CN 1501138A CN A021520178 A CNA021520178 A CN A021520178A CN 02152017 A CN02152017 A CN 02152017A CN 1501138 A CN1501138 A CN 1501138A
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- CN
- China
- Prior art keywords
- scattering points
- guide plate
- light guide
- backlight module
- light
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The light guiding board for back light assembly is made of transparent material, and includes one rectangular plate and several light scattering points. The rectangular plate includes one incident plane, one light outgoing plane and one base plane. The light scattering points are distributed in rows and columns on the base plane of the rectangular plate, the light scattering points nearest to the incident plane have smallest radius, and the distribution of the light scattering points varies with the distance to the incident plane in certain function relation. The said distribution can raise the outgoing light brightness and homogeneity of the back light assembly for LCD.
Description
[technical field]
The invention relates to the light guide plate that a kind of backlight module is used.
[background technology]
Because the liquid crystal itself in the panel of LCD is not had a characteristics of luminescence, thereby, for reaching display effect, a backlight arrangement is provided must for the LCD panel, as backlight module, its function is to provide the light that briliancy is abundant and be evenly distributed to panel of LCD.
The backlight module of prior art mainly is made up of light source, light guide plate, reflecting plate, diffuser plate and prism plate.Wherein, this light source is line source or pointolite, its be arranged at light guide plate one side or two opposite sides and with light emission to this light guide plate.The effect of this light guide plate is the transmission direction of direct light line, make light by the even outgoing of the exiting surface of light guide plate, reflecting plate is arranged at bottom surface one side of this light guide plate, being reflected into once more by the light of bottom surface of light guide plate outgoing in this light guide plate, improves the utilization factor of light.Diffuser plate and prism plate then are set in turn in exiting surface one side of light guide plate, so that more even from the distribution of light of light guide plate outgoing, and then the briliancy and the homogeneity of raising panel of LCD.
Light guide plate can be divided into uniform plate shaped light guide plate of thickness and wedge shape light guide plate according to its shape.In addition, for increasing the light extraction efficiency and the homogeneity of light guide plate, the one side in light guide plate is provided with V-shaped groove or configuration scattering points usually.And the distance that this V-shaped groove or scattering points dispose on light guide plate all can have different designs with size.When light transmission during to V-shaped groove or scattering points, this V-shaped groove or scattering points can be destroyed the total reflection condition of light in the light guide plate internal transmission, and light is transmitted to different directions, and finally the exiting surface by light guide plate penetrates.Utilize various densitys, the V-shaped groove that varies in size or scattering points, can improve the utilization factor of incident ray and make emergent ray more even.
A kind of scattering points of prior art light guide plate distributes as shown in Figure 1, and it is exposed in No. the 5th, 363,294, the United States Patent (USP) of bulletin on November 8th, 1994.This patent discloses a planar light source device, and this planar light source device comprises that line source 2, that a tool incidence surface and the light guide plate 1, of exiting surface are arranged at this light guide plate 1 incidence surface one side is arranged at the reflecting plate 5 that diffuser plate 6 that the reflecting plate 4 of this light guide plate 1 end face one side, relative this light guide plate 1 exiting surface be provided with and this light guide plate 1 bottom surface relatively are provided with.Wherein, be the light that effectively utilizes line source 2 to be sent, it also is provided with a reflection lampshade 7 around this line source 2.This light guide plate 1 bottom surface is provided with a plurality of scattering points 3 that the ranks shape is arranged that are.
Again as shown in Figure 2, it is the distribution schematic diagram of this scattering points 3 in this light guide plate 1 bottom surface.This scattering points 3 forms multiple row along the direction with line source 2 axially parallels, and scattering points 3 big or small identical in each row.This scattering points 3 is along forming a plurality of row with the axially vertical directions of line source 2, and the varying in size of scattering points 3 in each row, wherein, near scattering points 3 minimums of line source 2, along with the increase of line source 2 distances, this scattering points 3 is linear to become big gradually.Owing to the increase along with transmission range of the intensity of line source 2 emitted lights reduces, light guide plate 1 is posted reflecting plate 4 (as shown in Figure 1) away from an end face of line source 2 in addition, 4 pairs of reflections that are projeced into its glazed thread of this reflecting plate, causing this light guide plate 1 interior light intensity is not to reach minimum in the end face away from line source 2, and its minimum light line strength is between incidence surface and end face and near this end face.The size of this scattering points 3 promptly in this light guide plate 1 the minimum place of light intensity reach maximum, and thereupon with constant size distribution to the end face of this light guide plate 1 away from line source 2.
Because the light that line source 2 sends in the transmission course, repeatedly reflects between light guide plate 1 exiting surface and bottom surface in light guide plate 1 usually, the variation of its actual light line strength in light guide plate 1 is not the variation of a linearity.This scattering points 3 still is difficult to realize the even fully, consistent of whole light guide plate luminous exitance in the linear distribution of this light guide plate 1 bottom surface.
[summary of the invention]
The light guide plate that the technical matters that the present invention solves is to provide the backlight module of high briliancy of a kind of tool and uniformity coefficient to use.
For realizing the technical problem to be solved in the present invention, the light guide plate that backlight module of the present invention is used comprises: one intersects with incidence surface and in order to the exiting surface of light derivation, one and the exiting surface opposed bottom surface in order to the incidence surface, that receives incident ray, be the scattering points that the ranks shape is arranged at this bottom surface or exiting surface with a plurality of, wherein, row scattering points minimum near incidence surface, and according to a function, this function is the radius size of each row scattering points: r=A+BX+CX according to its place columns
2+ DX
3+ EX
4+ FX
5, wherein, r is the scattering points radius; X is a scattering points place columns, and being first row near the columns of incidence surface, and A, B, C, D, E and F are constant.
Compared to prior art, the present invention has following advantage: light guide plate of the present invention adopts the scattering points of nonlinear Distribution that incident ray is carried out scattering, and the scattering points that the scattering points of this nonlinear Distribution distributes compared to the prior art neutral line can further improve the briliancy and the homogeneity of liquid crystal display backlight module emergent light.
[description of drawings]
Fig. 1 is the side view of prior art planar light source device;
Fig. 2 is the distribution schematic diagram of the scattering points of prior art planar light source device in bottom surface of light guide plate;
Fig. 3 is the stereographic map that light guide plate that backlight module of the present invention is used cooperates with light source;
Fig. 4 is the scattering points distribution schematic diagram of the light guide plate used of backlight module of the present invention;
Fig. 5 is the distribute synoptic diagram of another embodiment of light guide plate scattering points that backlight module of the present invention is used.
[embodiment]
As shown in Figure 3, be the stereographic map that light guide plate 20 that backlight module of the present invention is used cooperates with light source 30.The light guide plate 20 that this backlight module is used is rectangular flats, it comprise bottom surface that an incidence surface 21, intersects with incidence surface 21 22, one relative with bottom surface 22 and with the crossing exiting surface of incidence surface 21 23, one and incidence surface 21 opposing end faces 24 and two relative sides 25.
The light guide plate 20 that this backlight module is used is with transparent material, makes as acryl resin, polycarbonate, polyvinyl resin or glass etc.Wherein, this incidence surface 21 is a plurality of arcwall faces that are opened in the light guide plate 20 that this backlight module uses, and these a plurality of arcwall faces evenly are provided with at interval.This light source 30 is a plurality of light emitting diodes or other pointolite, its corresponding with a plurality of arcwall faces separately setting.The light that this light source 30 sends is incident to the light guide plate 20 that this backlight module is used via incidence surface 21.But these incidence surface 21 plating anti-reflection films are in order to light incident.
This exiting surface 23 is to derive the light guide plate 20 that this backlight module is used in order to the light that light source 30 is sent.This end face 24 can attach reflecting plate (figure does not show) or plating reflectance coating with two sides 25, to prevent the end face 24 and two sides 25 outgoing of the light guide plate 20 that light is used from this backlight module.
As shown in Figure 4, for improving the bright dipping briliancy and the homogeneity of the light guide plate 20 that this backlight module uses, a plurality of scattering points 26 are set in its bottom surface 22.This scattering points 26 can be printed or the mode of ejection formation is formed on the bottom surface 22 of the light guide plate 20 that this backlight module uses.
These a plurality of scattering points 26 are the bottom surface 22 that the ranks shape is distributed in the light guide plate 20 that this backlight module uses, wherein, with a determining deviation multiple row scattering points 26 is set along the direction parallel with Y, with a determining deviation multirow scattering points 26 is set along the direction parallel with X, and with a row scattering points 26 minimums near incidence surface.
The equal and opposite in direction of each row scattering points 26, each the row scattering points 26 radius size r according to its place columns according to a function: r=A+BX+CX
2+ DX
3+ EX
4+ FX
5
Wherein, X represents scattering points place columns, and classifies first row as with distance incidence surface 21 nearest scattering points places; A, B, C, D, E and F are constants, and the thickness of its light guide plate 20 that can use according to this backlight module and size and set.
As shown in Figure 5, for further strengthening the effect of 26 pairs of light of scattering points, odd column that each is adjacent and even column scattering points 26 can stagger the hemistich distance respectively and be the alternating expression distribution.
This scattering points 26 can the cylindrical shape printing be made in the bottom surface 22 of the light guide plate 20 that this backlight module uses, certainly, this scattering points 26 can also other Any shape and mode be made in this bottom surface 22.As, when making scattering points 26 with injection molding method, this scattering points 26 is circle spherical surface body, the cone or the most advanced and sophisticated conical platform of pruning.
The light guide plate 20 that backlight module of the present invention is used also can have other change design, as: the light guide plate 20 that this backlight module is used is designed to clapboard, perhaps incidence surface 21 is set to plane etc.When this incidence surface 21 was the plane, the light source that is oppositely arranged with it was not limited to pointolite.These a plurality of scattering points 26 can be arranged at the exiting surface 23 of the light guide plate 20 that this backlight module uses equally or be distributed in bottom surface 22 simultaneously and exiting surface 23.
The bottom surface 22 of the light guide plate 20 that a plurality of scattering points 26 are used in this backlight module or the distribution mode of exiting surface 23 can improve the outgoing light homogeneity of the light guide plate 20 that this backlight module uses.
Claims (7)
1. light guide plate that backlight module is used, it comprises: one in order to receive the incidence surface of incident ray; One in order to the exiting surface with the light derivation, and itself and incidence surface intersect; One with exiting surface opposed bottom surface and a plurality of scattering points, this scattering points is the ranks shape and is arranged at this bottom surface or exiting surface, and the row scattering points minimum near incidence surface is characterized in that: according to a function, this function is the radius size of each row scattering points according to its place columns:
R=A+BX+CX
2+ DX
3+ EX
4+ FX
5Wherein, r is the scattering points radius; X is a scattering points place columns, and near the columns of incidence surface to be first row; A, B, C, D, E and F are constant.
2. the light guide plate that backlight module as claimed in claim 1 is used is characterized in that: adjacent odd column and even column scattering points stagger the hemistich distance respectively and are the alternating expression distribution.
3. the light guide plate that backlight module as claimed in claim 1 is used is characterized in that: this each row scattering points and each row scattering points are for being provided with at interval.
4. the light guide plate that backlight module as claimed in claim 1 is used is characterized in that: its further comprise one with incidence surface opposing end faces and two relative sides.
5. the light guide plate that backlight module as claimed in claim 4 is used is characterized in that: the side that this end face is relative with two is posted reflecting plate or plating reflectance coating respectively.
6. the light guide plate that backlight module as claimed in claim 1 is used is characterized in that: this incidence surface plating anti-reflection film.
7. the light guide plate that backlight module as claimed in claim 1 is used is characterized in that: this scattering points is cylindrical, circle spherical surface body, cone or taper platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021520178A CN1501138A (en) | 2002-11-18 | 2002-11-18 | Light transmitting board for backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021520178A CN1501138A (en) | 2002-11-18 | 2002-11-18 | Light transmitting board for backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1501138A true CN1501138A (en) | 2004-06-02 |
Family
ID=34234586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021520178A Pending CN1501138A (en) | 2002-11-18 | 2002-11-18 | Light transmitting board for backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1501138A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943975A (en) * | 2012-11-05 | 2013-02-27 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN104421770A (en) * | 2013-09-11 | 2015-03-18 | 联想(北京)有限公司 | Backlight module and display device |
| CN105353444A (en) * | 2015-11-13 | 2016-02-24 | 重庆鑫翎创福光电科技股份有限公司 | Printing-free light guide plate structure |
| CN108267810A (en) * | 2018-03-02 | 2018-07-10 | 深圳创维－Rgb电子有限公司 | A kind of light guide plate, backlight module and display equipment |
| CN108954038A (en) * | 2018-06-12 | 2018-12-07 | 北京交通大学 | Multi-functional chromatography area source |
| CN113641038A (en) * | 2015-06-09 | 2021-11-12 | 瑞仪光电(苏州)有限公司 | Backlight module |
-
2002
- 2002-11-18 CN CNA021520178A patent/CN1501138A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943975A (en) * | 2012-11-05 | 2013-02-27 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN102943975B (en) * | 2012-11-05 | 2015-11-25 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN104421770A (en) * | 2013-09-11 | 2015-03-18 | 联想(北京)有限公司 | Backlight module and display device |
| CN113641038A (en) * | 2015-06-09 | 2021-11-12 | 瑞仪光电(苏州)有限公司 | Backlight module |
| CN105353444A (en) * | 2015-11-13 | 2016-02-24 | 重庆鑫翎创福光电科技股份有限公司 | Printing-free light guide plate structure |
| CN108267810A (en) * | 2018-03-02 | 2018-07-10 | 深圳创维－Rgb电子有限公司 | A kind of light guide plate, backlight module and display equipment |
| CN108954038A (en) * | 2018-06-12 | 2018-12-07 | 北京交通大学 | Multi-functional chromatography area source |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |