CN100445829C - Light guide plate - Google Patents
Light guide plate Download PDFInfo
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- CN100445829C CN100445829C CNB2005100349494A CN200510034949A CN100445829C CN 100445829 C CN100445829 C CN 100445829C CN B2005100349494 A CNB2005100349494 A CN B2005100349494A CN 200510034949 A CN200510034949 A CN 200510034949A CN 100445829 C CN100445829 C CN 100445829C
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- guide plate
- light guide
- microstructure
- microstructures
- light
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The present invention relates to a light guiding plate which comprises a light incidence surface, a light leaving surface which is adjacent to the light incidence surface, a bottom surface which is opposite to the light leaving surface, and a plurality of microstructures which bulge on the bottom surface, wherein each of the microstructures comprises a top surface and a bottom surface which is opposite to the top surface; the top surfaces of the microstructures are all positioned in a first plane, the bottom surfaces of the microstructures and the bottom surface are the same surface, and the area of the bottom surfaces are larger than that of the top surface. A wedgy angle is formed between the first plane and the bottom surface, wherein the depth of the microstructures is diminished along with the enlargement of a distance between the microstructures and the light incidence surface, and the side surfaces of the microstructures are shortened gradually. The bottom surfaces of the microstructures are arranged regularly in the same step. The set makes the light guiding plate have the advantages of high brightness uniformity and easy fabrication.
Description
[technical field]
The present invention relates to a kind of light guide plate that is applied to field of liquid crystal display, relate in particular to a kind of wedge shape light guide plate.
[background technology]
(Light Guide Plate LGP) is important component part in the LCD backlight module to light guide plate.The effect of light guide plate be the light that sends of guiding spaced point light source (for example light emitting diode) or line source (for example cold-cathode tube) from a plane outgoing, improve the homogeneity of luminous gray scale of panel and luminosity simultaneously.Usually, light guide plate adopts transparent synthetic resin material to make, as acryl resin; It mainly comprises light entrance face, reflection bottom face, exiting surface and some sides.
The light that enters light guide plate will be propagated in light guide plate according to total reflection principle, when light runs into the microstructure (pattern) on light guide plate surface, total reflection condition is destroyed, light penetrates from the light guide plate exiting surface, for making the light guide plate uniformly light-emitting, various densitys, the microstructure design that varies in size are suggested.
Propose a kind of plate light guide plate in the prior art, it comprises a light entrance face, an exiting surface, and a bottom.This bottom has the lattice point structure of a plurality of homogeneous degree of depth and size, as conical microstructure, square taper microstructure etc.; These a plurality of lattice point structures are regular the arranging of repeatability in this bottom.These a plurality of lattice point structures can penetrate, the light from light entrance face incident to obtain the area source with certain brightness at exiting surface via the diffusion and the reflection back of this bottom.But, because the lattice point structure of above-mentioned whole bottom has the homogeneous degree of depth and size, and be regular the arranging of repeatability, make this light guide board microstructure side surface reflect and make it flee from light guide plate and the luminous energy loss that causes is bigger to entering part light in the light guide plate, the light intensity of light arrival light entrance face far-end is relatively poor, thereby causes the brightness uniformity of this light guide plate relatively poor.
For promoting the brightness uniformity of light guide plate, prior art proposes another kind of plate light guide plate, and it comprises a light entrance face, an exiting surface, and a bottom.This bottom has the lattice point structure of a plurality of homogeneous degree of depth and size, as conical microstructure, square taper microstructure; These a plurality of lattice point structures distribute by some curvilinear paths in this bottom, and its distribution density increases with the increase of the distance of itself and light entrance face, and non-repeatability is regular arranges and be.But non-repeatability is regular arranges because the lattice point structure on its bottom is, and it causes the manufacture difficulty of this light guide plate bigger.
In view of this, be necessary to provide a kind of light guide plate, it is good and be easy to characteristics such as making that it can have a brightness uniformity.
[summary of the invention]
To a kind of light guide plate be described with specific embodiment below, it is good and be easy to characteristics such as making that it can have a brightness uniformity.
For realizing foregoing, a kind of light guide plate is provided, it comprises:
One light entrance face;
One exiting surface adjacent with this light entrance face;
One with this exiting surface opposed bottom surface; And
In a plurality of microstructures of this bottom surface projection, each microstructure comprises a top surface and a basal surface relative with this top surface, and the bottom surface area of each microstructure is greater than its corresponding top surface area; The top surface of these a plurality of microstructures all is positioned at one first plane, its basal surface and this bottom surface coplane, and this first plane becomes a key groove with the bottom surface, and the top surface area of this microstructure increases along with the increase of the distance of this microstructure and this light entrance face.
The top surface area of described microstructure increases along with the increase of the distance of this microstructure and this light entrance face.
Preferably, adjacent microstructures equates along a spacing perpendicular to this light entrance face direction.
Preferably, adjacent microstructures equates along a spacing that is parallel to this light entrance face direction.
Preferably, described microstructure is selected from taper shape or square taper microstructure.
Preferred, described side's taper microstructure all has equal square cone angle.
Preferred, the square cone angle magnitude range of described side's taper microstructure is 0＜γ≤60 degree; Wherein, the γ side of being cone angle.
Preferably, described key groove magnitude range is 0＜β≤2 degree; Wherein, β is a key groove.
The material of described light guide plate is selected from acryl resin or polycarbonate.
With respect to prior art, light guide plate provided by the present invention, its degree of depth of a plurality of microstructures that is positioned at the bottom surface is along with the increase of the distance of itself and light entrance face and reduce gradually, and the plane, top surface place of these a plurality of microstructures becomes a key groove with its bottom surface, basal surface place; Because the degree of depth of microstructure reduces gradually along with the increase of the distance of itself and light entrance face, then its side surface reduces gradually, make and to reflect and make it flee from the luminous energy loss that light guide plate causes to reduce entering the inner light splitter of light guide plate because of the side surface of microstructure, thereby make the light intensity of light entrance face far-end be enhanced, and then make the brightness uniformity of whole light guide plate get a promotion.In addition, these a plurality of microstructures are etc. that the regular of pitch arranged, and it makes that this light guide plate is easy to make.
[description of drawings]
Fig. 1 is the vertical view of the light guide plate of first embodiment of the invention.
Fig. 2 is the front view of the light guide plate of first embodiment of the invention.
Fig. 3 is the left view of the light guide plate of first embodiment of the invention.
Fig. 4 is the right view of the light guide plate of first embodiment of the invention.
Fig. 5 is the sectional view along the V-V hatching line of Fig. 1.
Fig. 6 is the enlarged drawing of the VI part of Fig. 1.
Fig. 7 is the sectional view along the VII-VII hatching line of Fig. 6.
[embodiment]
Below in conjunction with accompanying drawing the embodiment of the invention is described in further detail.
Referring to Fig. 1 and Fig. 2, the light guide plate 10 that first embodiment of the invention provides, it comprises exiting surface 14, one and exiting surface 14 opposed bottom surface 16 that a light entrance face 12, one and light entrance face 12 are adjacent; And be positioned at a plurality of microstructures 162 of bottom surface 16 projectioies.
Wherein, the material of this light guide plate 10 can be selected acryl resin for use, as polymethylmethacrylate; And polycarbonate.Exiting surface 14 can be roughly vertical mutually with light entrance face 12; Exiting surface 14 can almost parallel with bottom surface 16.
A plurality of microstructures 162 are one or four jiaos of side's tapers (Quadrangular Pyramid) microstructures in the present embodiment.These a plurality of microstructure 162 rules are arranged on the bottom surface 16 of light guide plate 10, form a regular micro structure array of arranging.Each microstructure 162 comprises a top surface 1624 and a basal surface 1622 relative with top surface 1624, and the area of this basal surface 1622 is greater than the area of this top surface 1624.The top surface 1624 of these a plurality of microstructures all is arranged in first plane 18 (shown in the dotted line of Fig. 2), its basal surface 1622 and bottom surface 16 coplanes.Below will be with the direction parallel as column direction with light entrance face 12, the direction vertical with light entrance face 12 elaborates to a plurality of microstructures 162 as line direction.
The top surface 1624 that is arranged in the microstructure 162 of delegation has the different area size, and it is along with microstructure 162 increases with the increase of the distance of light entrance face 12; Form the V-arrangement space between the adjacent microstructures 162.The microstructure 162 that is arranged in delegation has the different degree of depth, and it is along with microstructure 162 reduces (seeing also Fig. 2), the 16 one-tenth one key groove β in plane 18, top surface 1624 place and bottom surface, basal surface 1622 place with the increase of the distance of light entrance face 12; Preferably, 0＜β≤2 degree.Owing to the increase along with the distance of itself and light entrance face 12 of the degree of depth of microstructure 162 reduces, its side surface reduces gradually, make and to make it flee from the energy loss that light guide plate 10 causes to reduce because of the side surface of microstructure 162 reflects the part light that enters light guide plate 10, thereby make the light intensity of light entrance face 12 far-ends be enhanced, and then make the brightness uniformity of whole light guide plate 10 get a promotion.
See also Fig. 3～Fig. 5, the microstructure 162 that is arranged in same row has same depth, forms the V-arrangement space between the adjacent microstructures 162.Wherein, the black corner block among Fig. 3 is to see the set of the top surface 1624 of each microstructure 162 perpendicular to light entrance face 12 directions.As seen from Figure 5, these light guide plate 10 structures can be regarded as by a substrate, and constitute at the micro structure array of substrate one rat.
See also Fig. 6, the spacing that the edge of adjacent microstructures 162 is parallel to light entrance face 12 directions is identical; And it is identical perpendicular to the spacing of light entrance face 12 directions; And the spacing that the edge that is preferably adjacent microstructures 162 is parallel to light entrance face 12 directions reaches perpendicular to the spacing of light entrance face 12 directions equal.The spacing of the adjacent microstructures 162 of present embodiment is zero, and is adjacent to each other between promptly adjacent two microstructures 162; Certainly, this spacing is not limited to zero, and it also can be other value.The basal surface 1 622 (referring to Fig. 2) of these a plurality of microstructures 162 all equates with the contact area of the bottom surface 16 of light guide plate 10; Thereby constitute the micro structure array that first-class pitch P distributes.Because this a plurality of microstructures 162 such as are at regular arrangement modes of pitch P, therefore make this light guide plate 10 be easy to making.
See also Fig. 7, preferred, described a plurality of microstructures 162 all have equal square cone angle, and the related square cone angle of present embodiment is meant the side surface 1623 of microstructure 162 and the angle of its basal surface 1622 (referring to Fig. 2); Preferred, described side's cone angle gamma magnitude range is 0＜γ≤60 degree.
Among another embodiment, can adopt the protruding microstructure of triangle side's taper (Triangular Pyramid), or the protruding microstructure of other polygonal side's taper (Polygonal Pyramid), as four jiaos of side's tapered protrusion microstructures among alternative first embodiment such as five jiaos of side's awls (PentagonalPyramid), hexagonal side's awl (Hexagonal Pyramid).Preferably, described a plurality of protruding microstructure has equal square cone angle; Preferred, described side's cone angle magnitude range is 0＜γ≤60 degree; Wherein, the γ side of being cone angle.
Among another embodiment, can adopt four jiaos of side's tapered protrusion microstructures among alternative first embodiment of conical protrusions microstructure.
In addition, those skilled in the art also can do other and change in spirit of the present invention, as the shape of suitable change microstructure, or appropriate change depth of microstructure, size, orientation, or the designs such as spacing of appropriate change adjacent microstructures are to be used for the present invention; As long as it does not depart from technique effect of the present invention and all can.The variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (9)
1. light guide plate, it comprises: a light entrance face; One exiting surface adjacent with this light entrance face; One with this exiting surface opposed bottom surface; Reach a plurality of microstructures in this bottom surface projection; It is characterized in that each microstructure comprises a top surface and a basal surface relative with this top surface, and the bottom surface area of each microstructure is greater than its corresponding top surface area; The top surface of these a plurality of microstructures all is positioned at one first plane, its basal surface and this bottom surface coplane, and this first plane becomes a key groove with the bottom surface, and the top surface area of this microstructure increases along with the increase of the distance of this microstructure and this light entrance face.
2. light guide plate as claimed in claim 1 is characterized in that the degree of depth of described microstructure reduces along with the increase of the distance of this microstructure and this light entrance face.
3. light guide plate as claimed in claim 1 is characterized in that the edge of adjacent microstructures is equal perpendicular to the spacing of this light entrance face direction.
4. as claim 1 or 3 described light guide plate, it is characterized in that the edge of adjacent microstructures is parallel between this light entrance face direction apart from equating.
5. as claim 1 a described light guide plate, it is characterized in that described microstructure is selected from taper shape or square taper microstructure.
6. light guide plate as claimed in claim 5 is characterized in that described side's taper microstructure has equal square cone angle.
7. light guide plate as claimed in claim 6, the square cone angle magnitude range that it is characterized in that described side's taper microstructure are 0＜γ≤60 degree; Wherein, the γ side of being cone angle.
8. light guide plate as claimed in claim 1 is characterized in that described key groove magnitude range is 0＜β≤2 degree; Wherein, β is a key groove.
9. light guide plate as claimed in claim 1 is characterized in that the material of described light guide plate is selected from acryl resin or polycarbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100349494A CN100445829C (en) | 2005-05-28 | 2005-05-28 | Light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100349494A CN100445829C (en) | 2005-05-28 | 2005-05-28 | Light guide plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1869783A CN1869783A (en) | 2006-11-29 |
| CN100445829C true CN100445829C (en) | 2008-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100349494A Expired - Fee Related CN100445829C (en) | 2005-05-28 | 2005-05-28 | Light guide plate |
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| Country | Link |
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| CN (1) | CN100445829C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299113B (en) * | 2007-04-30 | 2011-06-29 | 鸿富锦精密工业（深圳）有限公司 | Back light module unit and optical panel thereof |
| CN101614368B (en) * | 2008-06-27 | 2011-11-23 | 鸿富锦精密工业（深圳）有限公司 | Light guiding element and light source component with same |
| CN102621742A (en) * | 2012-04-13 | 2012-08-01 | 查氏电子实业(深圳)有限公司 | Liquid crystal display module |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496052Y (en) * | 2001-04-13 | 2002-06-19 | 宋义 | Improved, uniform and high efficiency side lighting type back light source |
| CN2516997Y (en) * | 2002-01-17 | 2002-10-16 | 唐龙 | Back light source of net-shape high-brightness angle reflection light plate |
| JP2003107474A (en) * | 2001-09-28 | 2003-04-09 | Harison Toshiba Lighting Corp | Front light and front light type display device |
| CN1441297A (en) * | 2002-02-28 | 2003-09-10 | 三洋电机株式会社 | Display device and light guide plate |
| US20040090765A1 (en) * | 2002-11-08 | 2004-05-13 | Tai-Cheng Yu | Light guide plate for liquid crystal display |
-
2005
- 2005-05-28 CN CNB2005100349494A patent/CN100445829C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496052Y (en) * | 2001-04-13 | 2002-06-19 | 宋义 | Improved, uniform and high efficiency side lighting type back light source |
| JP2003107474A (en) * | 2001-09-28 | 2003-04-09 | Harison Toshiba Lighting Corp | Front light and front light type display device |
| CN2516997Y (en) * | 2002-01-17 | 2002-10-16 | 唐龙 | Back light source of net-shape high-brightness angle reflection light plate |
| CN1441297A (en) * | 2002-02-28 | 2003-09-10 | 三洋电机株式会社 | Display device and light guide plate |
| US20040090765A1 (en) * | 2002-11-08 | 2004-05-13 | Tai-Cheng Yu | Light guide plate for liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1869783A (en) | 2006-11-29 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081224 Termination date: 20140528 |