CN101470221A - Diffusion plate and backlight module using the same - Google Patents
Diffusion plate and backlight module using the same Download PDFInfo
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- CN101470221A CN101470221A CNA2007101606254A CN200710160625A CN101470221A CN 101470221 A CN101470221 A CN 101470221A CN A2007101606254 A CNA2007101606254 A CN A2007101606254A CN 200710160625 A CN200710160625 A CN 200710160625A CN 101470221 A CN101470221 A CN 101470221A
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Abstract
The invention relates to a diffusion board and a backlight module adopting the diffusion board. The backlight module comprises a plurality of lamp sources, a reflecting cover and a first diffusion board, wherein the lamp sources are distanced from each other and arranged in the reflecting cover; the first diffusion board is arranged above the lamp sources; the light outgoing face of the first diffusion board is provided with a plurality of first and second patterns of stripe shape; the first and the second patterns are alternatively arranged, having arc profiles; the height to width ratio of the first patterns is 0.4 to 1; the height to width ratio of the second patterns is 0.6 to 0.9 powers of the height to width ratio of the first patterns.
Description
Technical field
The present invention relates to the backlight liquid crystal display module, particularly diffuser plate wherein.
Background technology
In recent years, traditional cathode-ray tube display (CRT monitor that promptly is commonly called as) is replaced by LCD gradually, main cause is that the radiant quantity that LCD discharges is far smaller than CRT monitor, and LCD also shows the reduction that lands in this manufacturing cost in several years.In general, LCD comprises backlight module and liquid crystal panel two large divisions, and the main function of backlight module is to provide the light source liquid crystal display to use.
In general, in backlight module, generally included a diffuser plate, this diffuser plate is made of the macromolecule light-transmitting materials that is doped with a plurality of smooth diffusion particles, its function is that the light that cathode fluorescent tube is sent spreads, with the influence of the minimizing bright shadow that cathode fluorescent tube was produced to display quality.If do not have this diffuser plate, then just can produce the light and shade band on the display surface.In early days, diffuser plate is mainly slab construction, but along with development of technology, the someone develops the diffuser plate that is formed with pattern (pattern) on exiting surface, so that the better raising of display quality.
Please refer to Fig. 1, Fig. 1 illustrate is the front view of the diffuser plate that has pattern on exiting surface.Diffuser plate 100 inside have a plurality of smooth diffusion particles, and this optics diffusion particle is to be used for the light diffusion, and denseer when the concentration of optics diffusion particle, then Kuo San effect is better, but penetrance is then lower.At this, the penetrance of diffuser plate 100 is about 60%.Diffuser plate 100 has a plurality of patterns 120 on exiting surface 110, after light passed this pattern 120, its direct of travel can change, so the bright shadow that can further reduce cathode fluorescent tube and produced is to the influence of display quality.Yet according to test result, the diffusion effect of this kind diffuser plate 100 still can't reach desirable state, thus in existing backlight module, also need dispose at least two diffusion barriers on the diffuser plate 100, so that light spreads more equably.
Therefore, the diffusion effect of diffuser plate being improved more, is to be worth those skilled in the art to go to consider ground.
Summary of the invention
The purpose of this invention is to provide a kind of diffuser plate and the backlight module that uses this diffuser plate, described diffuser plate can make diffusion effect better.
For achieving the above object, the technical solution used in the present invention comprises:
A kind of diffuser plate, constituted by a light-transmitting materials, it is characterized in that: first pattern and second pattern that have a plurality of strips on the exiting surface of described diffuser plate, described first pattern and the arrangement interlaced with each other of described second pattern, and the profile of described first pattern and described second pattern is an arc, the ratio of the height and the width of described first pattern is between 0.4 and 1, and the ratio of the height and the width of described second pattern is 0.6 to 0.9 times of ratio of the height and the width of first pattern.
In above-mentioned diffuser plate, the height of first pattern is between between the 0.2mm to 0.3mm, and its width is between between the 0.3mm to 0.5mm.
In above-mentioned diffuser plate, the material of diffuser plate is multipolymer, polypropylene, tygon or the polyethylene terephthalate of polymethylmethacrylate, polycarbonate, polystyrene, methyl methacrylate and styrene monomer.
For achieving the above object, the technical solution used in the present invention also comprises:
A kind of backlight module is characterized in that: comprising:
A plurality of lamps source, these described lamp sources have a spacing each other;
One reflex housing, these described light sources are to be placed in the described reflex housing;
One first diffuser plate, be configured in these described light source tops, first pattern and second pattern that have a plurality of strips on the exiting surface of described first diffuser plate, described first pattern and the arrangement interlaced with each other of described second pattern, and the profile of described first pattern and described second pattern is an arc, the ratio of the height and the width of described first pattern is between 0.4 and 1, and the ratio of the height and the width of described second pattern is 0.6 to 0.9 times of ratio of the height and the width of first pattern.
In above-mentioned backlight module, wherein the height of first pattern is between between the 0.2mm to 0.3mm, and its width is between between the 0.3mm to 0.5mm.
In above-mentioned backlight module, the material of first diffuser plate is multipolymer, polypropylene, tygon or the polyethylene terephthalate of polymethylmethacrylate, polycarbonate, polystyrene, methyl methacrylate and styrene monomer.
In above-mentioned backlight module, more comprise one second diffuser plate.This second diffuser plate is configured in the below of first diffuser plate, and has a plurality of the 3rd patterns on the incidence surface of second diffuser plate.And this 3rd pattern for example is a water chestnut mirror structure, and its drift angle is for example between 60 degree are spent to 90.
Compared with prior art, the beneficial effect that the present invention has is: via experimental result, even diffuser plate of the present invention under the situation of lower penetrance, still has preferable light diffusion effect.
Description of drawings
Fig. 1 illustrate is the front view of the diffuser plate that has pattern on exiting surface;
Fig. 2 illustrate is the synoptic diagram of the backlight module of embodiments of the invention;
Fig. 3 illustrate is the front view of first diffuser plate of Fig. 2;
Fig. 4 illustrate is the side view of second diffuser plate of Fig. 2;
Fig. 5 illustrate is the side view of second diffuser plate of Fig. 2.
Description of reference numerals: 100-diffuser plate; The 110-exiting surface; The 120-pattern; The 200-backlight module; The 210-light source; The 220-reflex housing; 230-first diffuser plate; 232,242-exiting surface; 234-first pattern; 236-second pattern; 240-second diffuser plate; 244-the 3rd pattern; The 250-diffusion barrier; The 260-brightness enhancement film; The little shape lens of 262-; H1, H2-height; W1, W2-width; A-embodiment curve; B-comparative example curve.
Embodiment
See also Fig. 2, Fig. 2 illustrate is the synoptic diagram of the backlight module of embodiments of the invention.This backlight module 200 comprises light source 210, reflex housing 220, first diffuser plate 230 and second diffuser plate 240.First diffuser plate 230 and second diffuser plate 240 are the tops that are configured in light source 210, and second diffuser plate 240 is the belows that are configured in first diffuser plate 230.Light source 210 is to be used to provide illuminating light, in the present embodiment, light source 210 is cathode fluorescent tube (Cold Cathode Fluorescent Lamp, be commonly called as: CCFL), but those skilled in the art also can change it into the array of light emitting diode (Light Emitting Diode is commonly called as LED).In addition, 220 of reflex housings are that the ray guidance that is used for light source 210 is produced is to the direction towards first diffuser plate 230 and second diffuser plate 240.
In addition, also be provided with a diffusion barrier 250 above first diffuser plate 230, the function of diffusion barrier 250 is to make light to spread more equably.In addition, the top of diffusion barrier 250 also is provided with two brightness enhancement film 260 (Brightness Enhancement Film), brightness enhancement film 260 is provided with a plurality of little shape lens (microlens) 262, this slightly shape lens 262 be the shape of convex lens, so have the effect of optically focused.
Then, please refer to Fig. 3, Fig. 3 illustrate is the front view of first diffuser plate of Fig. 2.First pattern 234 and second pattern 236 that have a plurality of strips on the exiting surface 232 of first diffuser plate 230, and first pattern 234 and 236 arrangements interlaced with each other of second pattern.Also promptly, second pattern 236 is between two first patterns 234.And as can be seen from Figure 3, the profile of first pattern 234 and second pattern 236 all is an arc.The height of first pattern 234 is H1, and width is W1, and wherein the value of H1/W1 is between 0.4 and 1.Also promptly, satisfy following relational expression between height H 1 and the width W 1:
0.4≦H1/W1≦1
In addition, the height of first pattern 236 is H2, and width is W2, and wherein the value of H2/W2 is 0.6 to 0.9 times of value of H1/W1.Also promptly, satisfy following relational expression between H2/W2 and the H1/W1:
0.4≦(H2/W2)/(H1/W1)≦0.9
In the present embodiment, have a plurality of diffusion particles in first diffuser plate 230, but the concentration of its diffusion particle is than diffuser plate 100 rarenesses of Fig. 1, the penetrance of described first diffuser plate 230 is 85% greater than 75% at present embodiment.And the material of first diffuser plate 230 is for example for being selected from one of them of the group that multipolymer, polypropylene, tygon and polyethylene terephthalate constituted of polymethylmethacrylate, polycarbonate, polystyrene, methyl methacrylate and styrene monomer.
Then, please be simultaneously with reference to Fig. 2 and Fig. 4, Fig. 4 illustrate is the side view of second diffuser plate of Fig. 2.Have a plurality of the 3rd patterns 244 on the incidence surface 242 of second diffuser plate 240, this 3rd pattern 244 is a water chestnut mirror structure, and also promptly the cross sectional shape of the 3rd pattern 244 is a triangle, and its drift angle is between 60 degree are spent to 90.
The inventor carries out brightness measurement to the backlight module 200 of Fig. 2, it gets 1451 measurement points (measure point) on the y direction of principal axis, these described measurement points are first-class spacing distance between any two, and the measurement result of these measurement points is depicted as embodiment curve a as shown in Figure 5.Then, the inventor is replaced as the diffuser plate 100 of Fig. 1 with first diffuser plate 230 in the backlight module 200, and identical amount side point is carried out optical measurement once more, and its measurement result is depicted as comparative example curve b among Fig. 5.In Fig. 5, the longitudinal axis is that the brightness transverse axis is then represented each measurement point, wherein the represented brightness of longitudinal axis zero dimensionization (dimensionless).As shown in Figure 5, even the penetrance of first diffuser plate 230 is higher, but the still more existing diffuser plate 100 of its measured Luminance Distribution is good.Therefore, first diffuser plate 230 of the present invention as can be known has preferable light diffusion effect.
More than explanation is just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skills understand, under the situation of the spirit and scope that do not break away from claim and limited; can make many modifications, variation or equivalence, but all will fall within protection scope of the present invention.
Claims (9)
1. diffuser plate, constituted by a light-transmitting materials, it is characterized in that: first pattern and second pattern that have a plurality of strips on the exiting surface of described diffuser plate, described first pattern and the arrangement interlaced with each other of described second pattern, and the profile of described first pattern and described second pattern is an arc, the ratio of the height and the width of described first pattern is between 0.4 and 1, and the ratio of the height and the width of described second pattern is 0.6 to 0.9 times of ratio of the height and the width of first pattern.
2. diffuser plate according to claim 1 is characterized in that: the height of described first pattern is between between the 0.2mm to 0.3mm, and width is between between the 0.3mm to 0.5mm.
3. diffuser plate according to claim 1 is characterized in that: the material of described diffuser plate is multipolymer, polypropylene, tygon or the polyethylene terephthalate of polymethylmethacrylate, polycarbonate, polystyrene, methyl methacrylate and styrene monomer.
4. backlight module is characterized in that: comprising:
A plurality of lamps source, these described lamp sources have a spacing each other;
One reflex housing, these described light sources are to be placed in the described reflex housing;
One first diffuser plate, be configured in these described light source tops, first pattern and second pattern that have a plurality of strips on the exiting surface of described first diffuser plate, described first pattern and the arrangement interlaced with each other of described second pattern, and the profile of described first pattern and described second pattern is an arc, the ratio of the height and the width of described first pattern is between 0.4 and 1, and the ratio of the height and the width of described second pattern is 0.6 to 0.9 times of ratio of the height and the width of first pattern.
5. backlight module according to claim 4 is characterized in that: the height of described first pattern is between between the 0.2mm to 0.3mm, and its width is between between the 0.3mm to 0.5mm.
6. backlight module according to claim 4 is characterized in that: the material of described first diffuser plate is multipolymer, polypropylene, tygon or the polyethylene terephthalate of polymethylmethacrylate, polycarbonate, polystyrene, methyl methacrylate and styrene monomer.
7. backlight module according to claim 4 is characterized in that: also dispose one second diffuser plate below described first diffuser plate, and have a plurality of the 3rd patterns on the incidence surface of described second diffuser plate.
8. backlight module according to claim 7 is characterized in that: these described the 3rd patterns are water chestnut mirror structure.
9. backlight module according to claim 8 is characterized in that: the drift angle of described water chestnut mirror structure is between 60 degree are spent to 90.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101606254A CN101470221B (en) | 2007-12-26 | 2007-12-26 | Diffusion plate and backlight module using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101606254A CN101470221B (en) | 2007-12-26 | 2007-12-26 | Diffusion plate and backlight module using the same |
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| Publication Number | Publication Date |
|---|---|
| CN101470221A true CN101470221A (en) | 2009-07-01 |
| CN101470221B CN101470221B (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101606254A Active CN101470221B (en) | 2007-12-26 | 2007-12-26 | Diffusion plate and backlight module using the same |
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| CN (1) | CN101470221B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004268A (en) * | 2014-05-22 | 2014-08-27 | 东莞市鑫聚光电科技有限公司 | Production method of PP (Propene Polymer) diffusion plate of display screen backlight source and LED (Light Emitting Diode) panel lamp |
| CN104865623A (en) * | 2015-06-17 | 2015-08-26 | 东莞市颖锋光电材料有限公司 | Three-in-one optical diffusion plate |
| CN107430220A (en) * | 2015-04-08 | 2017-12-01 | 株式会社可乐丽 | Complex diffuser |
| CN111402723A (en) * | 2019-11-21 | 2020-07-10 | 友达光电股份有限公司 | Backlight module |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4418986A (en) * | 1981-04-07 | 1983-12-06 | Mitsubishi Rayon Co., Ltd. | Rear projection screen |
| US6280063B1 (en) * | 1997-05-09 | 2001-08-28 | 3M Innovative Properties Company | Brightness enhancement article |
| US7142767B2 (en) * | 2003-12-31 | 2006-11-28 | 3M Innovative Properties Company | Scratch-resistant light directing films |
| CN2705513Y (en) * | 2004-03-01 | 2005-06-22 | 林文静 | Sound defusion board |
| CN100468086C (en) * | 2004-07-12 | 2009-03-11 | 大日本印刷株式会社 | Diffusion sheet, surface light source device and transmission display unit |
| CN2742462Y (en) * | 2004-10-25 | 2005-11-23 | 颖台科技股份有限公司 | Light spreading plate for increasing brightness |
-
2007
- 2007-12-26 CN CN2007101606254A patent/CN101470221B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004268A (en) * | 2014-05-22 | 2014-08-27 | 东莞市鑫聚光电科技有限公司 | Production method of PP (Propene Polymer) diffusion plate of display screen backlight source and LED (Light Emitting Diode) panel lamp |
| CN107430220A (en) * | 2015-04-08 | 2017-12-01 | 株式会社可乐丽 | Complex diffuser |
| CN107430220B (en) * | 2015-04-08 | 2021-03-09 | 株式会社可乐丽 | Composite diffusion plate |
| CN104865623A (en) * | 2015-06-17 | 2015-08-26 | 东莞市颖锋光电材料有限公司 | Three-in-one optical diffusion plate |
| CN111402723A (en) * | 2019-11-21 | 2020-07-10 | 友达光电股份有限公司 | Backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101470221B (en) | 2011-01-19 |
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