CN100432792C - Light guide plate and back light unit employing the same - Google Patents
Light guide plate and back light unit employing the same Download PDFInfo
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- CN100432792C CN100432792C CNB2006100771014A CN200610077101A CN100432792C CN 100432792 C CN100432792 C CN 100432792C CN B2006100771014 A CNB2006100771014 A CN B2006100771014A CN 200610077101 A CN200610077101 A CN 200610077101A CN 100432792 C CN100432792 C CN 100432792C
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- guide plate
- light guide
- backlight module
- optical
- protuberance
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The present invention discloses a light guide plate (LGP) which is applied to a backlight module. The light guide plate comprises a first surface and a second surface corresponding to the first surface, wherein the second surface has a plurality of optical structures, and each optical structure comprises a projecting portion, a grooving portion connected with the projecting portion, and a flat portion of which one end is connected with the grooving portion; the pitches of the optical structures are not completely same.
Description
Technical field
The present invention relates to the backlight module of a kind of light guide plate and application thereof, particularly relate to the light guide plate of brightness in a kind of small angle scope that can effectively improve liquid crystal indicator and the backlight module of application thereof.
Background technology
Can produce the liquid crystal indicator that enriches beautiful figure, owing to have that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, therefore be widely used on the portable type information products such as mobile computer, personal digital assistant, even replaced cathode-ray tube (CRT) (Cathode Ray Tube, the CRT) display that tradition is applied in desktop PC gradually.
Liquid crystal indicator is mainly assembled by the housing that a display unit, a backlight module and have a framework.Display unit comprises a display panel, but the thin-film package of the circuit board of process data signal and support usefulness (Tape Carrier Package, TCP) etc.Backlight module then is positioned at the display unit below, in order to the display unit of uniform light source to liquid crystal indicator to be provided.According to the presentation mode of light source, can be divided into side light type back light module or direct type backlight module again.With side light type back light module, line source or pointolite are arranged on the side of diaphragms such as light guide plate and diffusion barrier, and improve uniformity of light and luminescence efficiency by blooming pieces such as light guide plate and diffusion barriers.
Fig. 1 illustrates a kind of synoptic diagram of traditional backlight module.Backlight module 1 comprises: a light source 11, a light guide plate 13, a reflector plate 15 and plural number are opened optical thin film 17.Wherein, the light source 11 that produces light is positioned at the side of light guide plate 13, and a shielding 19 protection light sources 11 are arranged.General light source is that (Cold Cathode Fluorescent lamp CCFL), is set up on the tube face (not shown) cold cathode fluorescent lamp, and the tube line (not shown) then extends out from tube face and is electrically connected with a connector.
Light guide plate (light guide plate) 13 is in order to change the path of light.Therefore can pass through the guiding of light guide plate 13 and arrive the display panel (not shown) from the light that light source 11 distributed.In traditional backlight module 1, because light source 11 bright dippings can be because of refraction effect when entering light guide plate 13, so that the light source luminescent angle can become is narrow, therefore the light inlet side in light guide plate 13 forms V-structure (V-Cut) 131, so that light source goes out the optical range broadness that becomes.The reflector plate of light guide plate 13 belows (reflecting sheet) 15 then is to be used for reflecting the light that spills outside the light guide plate 13, to improve the reflection efficiency of light.
Many optical thin films of light guide plate 13 tops (optical sheet) 17 are to be used for light is further processed, for example optically focused, diffusion or effect such as soft.Concerning the light guide plate 13 of tool V-structure 131, optical thin film 17 comprises a prismatic lens (prism sheet) 171 and diffusion sheet (diffusion sheet) 173.Diffusion sheet 173 can one or many.Optical thin film 17 has been arranged, can be concentrated to positive view directions going out the become light of broad (light source is through the light guide plate 13 of V-structure 131) of optical range.Yet, also because the existence of optical thin film 17 makes the overall brightness homogeneity of backlight module 1 be difficult to control.
Summary of the invention
In view of this, the object of the present invention is to provide the backlight module of a kind of light guide plate and application thereof, utilize on light guide plate, to form special optical texture design, with the optical brightness in the optical brightness, particularly small angle scope that improve backlight module integral body.
According to purpose of the present invention, (light guide plate LGP), cooperates with a light source, is applied in the backlight module to propose a kind of light guide plate.Light guide plate comprises a second surface and one the 3rd surface of a first surface and relative first surface, and a light incident sides, and this light source is arranged at this light incident sides.Second surface has a plurality of optical textures, and each optical texture comprises: a protuberance (projecting portion); One recess (grooving portion) is connected with protuberance; And a par (flat portion), the one end is connected with recess.Wherein, (pitch) is incomplete same for the length of those optical textures, and the 3rd surface is relative with this light incident sides, and wherein the two ends of those optical textures lay respectively at this light incident sides and the 3rd surface.
According to purpose of the present invention, reintroduce a kind of backlight module, be applied in the liquid crystal indicator, backlight module comprises a light guide plate (LGP), a light source (light source) at least, is arranged at the side of light guide plate; And an optical sheet, the top that is positioned at light guide plate is located.Light guide plate comprises the second surface of first surface and relative first surface.Second surface has a plurality of optical textures, and each optical texture comprises: a protuberance (projecting portion); One recess (grooving portion) is connected with protuberance; And a par (flatportion), the one end is connected with recess.Wherein, the length of those optical textures (pitch) is incomplete same.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is a kind of synoptic diagram of traditional backlight module;
Fig. 2 A, Fig. 2 B are the diagrammatic cross-section and the stereographic map of the first type light guide plate of a preferred embodiment of the present invention;
Fig. 3 is the length of optical texture in the table one and the graph of a relation of position;
Fig. 4 is the diagrammatic cross-section of the second type light guide plate of a preferred embodiment of the present invention;
Fig. 5 is the diagrammatic cross-section of the 3rd type light guide plate of a preferred embodiment of the present invention;
Fig. 6 is the synoptic diagram of the backlight module of a preferred embodiment of the present invention.
The reference numerals explanation
1,6: backlight module
11,61: light source
2,13,63: light guide plate
131:V type structure
21,631: first surface
22,632: second surface
231,241,251: protuberance
233,243,253: recess
235,245,255: the par
15,65: reflector plate
17,67: optical thin film
171,671: prismatic lens
6712: lower surface
6714: groove
173,673: diffusion sheet
19,69: shielding
P1, P2, P3: the length of optical texture
Ap: the bottom surface breadth extreme of protuberance
Ag: the maximum open width of recess
Af: the width of par
Hp: the height of protuberance
Dg: concave depth
Embodiment
The present invention proposes a kind of light guide plate, be applied in the backlight module of liquid crystal indicator, mainly be on light guide plate, to form special optical texture design (or claiming the design of gradual change type prism structure), with the optical brightness in the optical brightness, particularly small angle scope that improve backlight module integral body.Below be to do detailed description of the present invention with a preferred embodiment, yet, the scope that this embodiment can't limit the present invention will protect.In addition, omit unnecessary element in the icon, with clear demonstration technical characterstic of the present invention.
Please refer to Fig. 2 A, Fig. 2 B, it illustrates diagrammatic cross-section and stereographic map according to the first type light guide plate of a preferred embodiment of the present invention.Shown in Fig. 2 A, (light guide plate, LGP) 2 comprise a first surface 21 and one of relative first surface 21 second surface 22 to light guide plate.Second surface 22 has a plurality of optical textures (not indicating), and each optical texture comprises: a protuberance (projecting portion) 231; One recess (grooving portion) 233 is connected with protuberance 231; And a par (flat portion) 235, the one end is connected with recess 233, and the protuberance 241 of another optical texture of the other end and adjacency is connected.In addition, in this embodiment, be parallel to first surface 21, and the height of protuberance (height) hp explains greater than concave depth (depth) Dg with par 235.
(pitch is P) by the bottom surface breadth extreme of protuberance, the maximum open width of recess and the width decision of par for the length of each optical texture.With the 3rd optical texture among Fig. 2 A is example, and length P3 is the summation (brief note is P3=Ap+Ag+Af) of the width Af of the maximum open width Ag of bottom surface breadth extreme Ap, recess 253 of protuberance 251 and par 255.Its length of those optical textures (pitch) on light guide plate 2 is incomplete same, i.e. P1 ≠ P2 or P1 ≠ P3 or P2 ≠ P3.
Below be to form one-period with the length of optical texture to change and explain.A kind of length cycle that discloses preferred embodiment in the table one changes.Fig. 3 is the length of optical texture in the table one and the graph of a relation of position.Wherein:
(1) forms 20 groups of optical textures on the light guide plate altogether;
(2) the 1st groups and the 20th group of optical texture are respectively at the outermost two ends of light guide plate;
(3) be positioned at the outermost optical texture length of light guide plate (i.e. the length 0.0797mm of the 1st group and the 20th group) greater than the length of the optical texture that is positioned at the light guide plate center (i.e. the length 0.0533mm of the 10th group and the 11st group);
(4) length of optical texture is successively decreased toward center position from the light guide plate outermost; That is the length of optical texture with the 1st group (0.0797mm) for the longest, the 2nd group (0.0784mm) slightly subtracts, and is minimum until the 10th group (0.0533mm).
Table one
| Group | Length (mm) | Group | Length (mm) |
| 1 | 0.0797 | 11 | 0.0533 |
| 2 | 0.0784 | 12 | 0.0544 |
| 3 | 0.0756 | 13 | 0.0566 |
| 4 | 0.0719 | 14 | 0.0597 |
| 5 | 0.0677 | 15 | 0.0635 |
| 6 | 0.0635 | 16 | 0.0677 |
| 7 | 0.0597 | 17 | 0.0719 |
| 8 | 0.0566 | 18 | 0.0756 |
| 9 | 0.0544 | 19 | 0.0784 |
| 10 | 0.0533 | 20 | 0.0797 |
When practical application, the formed cycle of the length of optical texture can be done suitably to adjust according to the homogeneity of Luminance Distribution, is not limited to the disclosed data of table one.
Optics emulation
If have the light guide plate that the cycle changes for optical texture length, carry out optics emulation with the light guide plate of traditional tool V-structure, its result is as shown in Table 2.
In the table two, the light guide plate of traditional tool V-structure is promptly shown in light guide plate among Fig. 1 13.And light guide plate first type and second type all have as table one and the optical texture length with cycle variation shown in Figure 3.But different is: in the first type light guide plate, (hp＞Dg) is promptly shown in Fig. 2 A greater than the depth D g of recess 233 for the height hp of protuberance 231; And in the second type light guide plate, the height of protuberance 231 less than the depth D g of recess 233 (hp＜Dg), as shown in Figure 4.
According to experimental result: no matter be first type or the second type light guide plate, can increase overall brightness really in small angle 1～10 degree scope, with 2 degree visual angles, the light guide plate of the comparable traditional V-structure of light guide plate of preferred embodiment increases by about 47% brightness.
Table two
| Visual angle 90 degree (R90) | |
|
|
| The light guide plate of tradition tool V-structure | 100.00％ | 100.00％ | 100.00％ |
| Optical texture length has the light guide plate (first type) that the cycle changes | 120.84％ | 103.32％ | 148.57％ |
| Optical texture length has the light guide plate (second type) that the cycle changes | 120.97％ | 101.60％ | 147.69％ |
Though it should be noted that in Fig. 2 A, Fig. 2 B, be that (hp＞Dg) is as the explanation of embodiment greater than concave depth with the height of protuberance.Yet the present invention is not as limit.Except the first type light guide plate among Fig. 2 A, (height that is protuberance is less than concave depth for the second type light guide plate of Fig. 4, (height that is protuberance equals concave depth, hp=Dg), can make all that overall brightness improves in the small angle scope for hp＜Dg) and the 3rd type light guide plate of Fig. 5.
In addition, though in the above-described embodiments, be with linear cross section (linear cross-section), be protuberance 231,241,251 and recess 233,243,253 cross sections triangular in shape (triangular cross-section), and par 235,245,255 is a straight line, explanation as optical texture, yet, the present invention is not limited to this, optical texture also can be an arc section (curved cross-section), for example with protuberance or/and recess is made into boss bulk (bump), also can reach the effect that increases brightness.
If the light guide plate of using the foregoing description when backlight module, can form a prism structure at the first surface (being the bright dipping side) 21 of light guide plate 2, can omit the prismatic lens in the script traditional backlight module 1 171 this moment, also can keep prismatic lens.Please refer to Fig. 6, it illustrates the synoptic diagram according to the backlight module of a preferred embodiment of the present invention.Wherein, backlight module 6 comprises: a light source 61, has light guide plate 63, a reflector plate 65 and many optical thin films 67 of optical texture.Wherein, light source 61 is positioned at the side of light guide plate 63, and with a shielding 69 protections.The optical texture of light guide plate 63 please refer to Fig. 2 A, Fig. 2 B and aforementioned related description.Reflector plate (reflecting sheet) 65 is arranged at light guide plate 63 belows and relative with second surface 632.Optical thin film 67 comprises a prismatic lens (prism sheet) 671 and one or many diffusion sheets (diffusion sheet) 673.Wherein, the lower surface 6712 of prismatic lens 671 is relative with the first surface 631 of light guide plate 63, and 6712 of lower surfaces have a plurality of grooves (furrow) 6714, and the bearing of trend of the protuberance of the bearing of trend of those grooves 6714 and light guide plate 63 and recess is vertical.Light guide plate 63, prismatic lens 671 and diffusion sheet 673 can be passed through and the panel of arrival display device from the light that light source 61 distributed.Use the light guide plate of optical texture of the present invention, the overall brightness that light guide can be concentrated in the positive view directions, particularly small angle scope can increase substantially.
In sum; though disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, thus protection scope of the present invention should with enclose claim was defined is as the criterion.
Claims (11)
1. a backlight module comprises light source and the light guide plate that cooperates with light source, and wherein, this light guide plate comprises:
One light incident sides, this light source is arranged at this light incident sides;
One first surface;
One second surface, relative with this first surface, this second surface has a plurality of optical textures, and each optical texture comprises:
One protuberance;
One recess is connected with this protuberance; And
One par, the one end is connected with this recess;
Wherein, the length of those optical textures is incomplete same; With
One the 3rd surface, relative with this light incident sides, wherein the two ends of those optical textures lay respectively at this light incident sides and the 3rd surface.
2. backlight module as claimed in claim 1, wherein the length of those optical textures is to form the one-period variation.
3. backlight module as claimed in claim 1 wherein is positioned at the length of the length of outermost this optical texture of this light guide plate greater than this optical texture that is positioned at this light guide plate center.
4. backlight module as claimed in claim 3, wherein the length of those optical textures is to successively decrease toward center position from this light guide plate outermost.
5. backlight module as claimed in claim 1, wherein in each optical texture, the height of this protuberance is greater than this concave depth.
6. backlight module as claimed in claim 1, wherein in each optical texture, the height of this protuberance is less than this concave depth.
7. backlight module as claimed in claim 1, wherein in each optical texture, the height of this protuberance equals this concave depth.
8. backlight module as claimed in claim 1, wherein this optical texture has a linear type cross section.
9. backlight module as claimed in claim 1, wherein this optical texture has an arc section.
10. backlight module as claimed in claim 1, wherein this recess and this protuberance have a triangular-section.
11. backlight module as claimed in claim 1 wherein comprises a prism structure on this first surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100771014A CN100432792C (en) | 2006-04-19 | 2006-04-19 | Light guide plate and back light unit employing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100771014A CN100432792C (en) | 2006-04-19 | 2006-04-19 | Light guide plate and back light unit employing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1837927A CN1837927A (en) | 2006-09-27 |
| CN100432792C true CN100432792C (en) | 2008-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100771014A Expired - Fee Related CN100432792C (en) | 2006-04-19 | 2006-04-19 | Light guide plate and back light unit employing the same |
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| Country | Link |
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| CN (1) | CN100432792C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI363888B (en) | 2008-09-22 | 2012-05-11 | Au Optronics Corp | Light guide plate, backlight module and liquid crystal dislay |
| CN101393300B (en) * | 2008-11-13 | 2010-04-21 | 友达光电股份有限公司 | LCD and light guiding plate thereof |
| KR102116418B1 (en) * | 2013-09-30 | 2020-06-01 | 삼성디스플레이 주식회사 | Light guide panel, back light assembly and diplay apparatus comprising the same and method for manufacturing light guide |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07294745A (en) * | 1994-04-25 | 1995-11-10 | Fanuc Ltd | Back light panel |
| CN1345406A (en) * | 1999-03-30 | 2002-04-17 | 韦斯特电气株式会社 | Illuminator and liquid crystal display comprising illuminator |
| CN2586983Y (en) * | 2002-12-03 | 2003-11-19 | 鸿富锦精密工业（深圳）有限公司 | Back light system |
| JP2004070169A (en) * | 2002-08-08 | 2004-03-04 | Matsushita Electric Ind Co Ltd | Light guide plate and back light apparatus using the same |
| CN1617995A (en) * | 2002-01-18 | 2005-05-18 | 三菱丽阳株式会社 | Light source device |
| JP2005268201A (en) * | 2004-02-20 | 2005-09-29 | Omron Corp | Surface light source device |
| JP2005285705A (en) * | 2004-03-31 | 2005-10-13 | Citizen Watch Co Ltd | Light guide member and lighting system using it |
-
2006
- 2006-04-19 CN CNB2006100771014A patent/CN100432792C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07294745A (en) * | 1994-04-25 | 1995-11-10 | Fanuc Ltd | Back light panel |
| CN1345406A (en) * | 1999-03-30 | 2002-04-17 | 韦斯特电气株式会社 | Illuminator and liquid crystal display comprising illuminator |
| CN1617995A (en) * | 2002-01-18 | 2005-05-18 | 三菱丽阳株式会社 | Light source device |
| JP2004070169A (en) * | 2002-08-08 | 2004-03-04 | Matsushita Electric Ind Co Ltd | Light guide plate and back light apparatus using the same |
| CN2586983Y (en) * | 2002-12-03 | 2003-11-19 | 鸿富锦精密工业（深圳）有限公司 | Back light system |
| JP2005268201A (en) * | 2004-02-20 | 2005-09-29 | Omron Corp | Surface light source device |
| JP2005285705A (en) * | 2004-03-31 | 2005-10-13 | Citizen Watch Co Ltd | Light guide member and lighting system using it |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1837927A (en) | 2006-09-27 |
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