CN103645524B - A kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display - Google Patents
A kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display Download PDFInfo
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- CN103645524B CN103645524B CN201310661550.3A CN201310661550A CN103645524B CN 103645524 B CN103645524 B CN 103645524B CN 201310661550 A CN201310661550 A CN 201310661550A CN 103645524 B CN103645524 B CN 103645524B
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Abstract
This application provides a kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display, wherein, this diffusion sheet comprises: comprise diffusion glue-line, this diffusion glue-line comprises first refractive particle and the second refracting particles, the particle diameter of first refractive particle belongs to the first particle size range, the particle diameter of the second refracting particles belongs to the second particle size range, and the mean value of the first particle size range is less than the mean value of the second particle size range; At four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles.In this application, on four angular zones of diffusion sheet, the refracting particles that particle diameter is large is many, and the brightness on four angular zones of diffusion sheet is increased.
Description
Technical field
The application relates to technical field of measurement and test, particularly relates to a kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display.
Background technology
Directly-down liquid crystal module comprises backboard, light source, diffuser plate, blooming piece, liquid crystal panel, drives system and structural acessory, has the advantages such as cost is low.In order to obtain better image quality, directly-down liquid crystal module is usually very thick, and can increase light mixing distance this is because thick, with making uniform light by liquid crystal panel, wherein, light mixing distance is the distance between light source and diffuser plate.But along with the conversion in market, the display terminal of ultra-thin form, as TV (Television, TV), panel computer (PAD) etc., receives the continuous concern in market.The directly-down liquid crystal module of thinning form starts to introduce to the market.
The directly-down liquid crystal module of thinning form, while reduction thickness, also reduces light mixing distance, and the directly-down liquid crystal module of thinning form easily produces the problem of corner obfuscation.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display, can make to be improved by the luminance brightness of diffusion sheet corner.
In order to solve the problem, this application discloses a kind of diffusion sheet, comprise diffusion glue-line, wherein, this diffusion glue-line comprises first refractive particle and the second refracting particles, the particle diameter of first refractive particle belongs to the first particle size range, and the particle diameter of the second refracting particles belongs to the second particle size range, and the mean value of the first particle size range is less than the mean value of the second particle size range; At four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles.
Preferably, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is greater than the ratio that the second refracting particles accounts for total refracting particles.
Preferably, the maximal value of the first particle size range is less than the minimum value of the second particle size range.
Optionally, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 60%, second refracting particles accounts for total refracting particles is 20%.
Preferably, at four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 20%, second refracting particles accounts for total refracting particles is 60%.
Preferably, the particle diameter of the second refracting particles is 2.5 to 3 times of the particle diameter of first refractive particle.
Preferably, the first particle size range is 10-15 micron, and the second particle size range is 25-30 micron.
Preferably, first refractive particle and the second refracting particles use commaterial.
Preferably, first refractive particle and the second refracting particles all use one of following material: resin, polymetylmethacrylate and polycarbonate.
In order to solve the problem, disclosed herein as well is a kind of directly-down liquid crystal module, comprise any one diffusion sheet above-mentioned.
Preferably, liquid crystal module also comprises: prismatic lens.
In order to solve the problem, disclosed herein as well is a kind of liquid crystal display, comprise any one liquid crystal module above-mentioned.
Compared with prior art, the application has the following advantages:
In this application, on four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles, that is, the refracting particles that particle diameter is large is many.Because the light of the large refracting particles place direct projection of particle diameter is more, the light be scattered is less, and the brightness on four angular zones of diffusion sheet is increased.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of diffusion sheet of the application;
Fig. 2 is the structural representation of diffusion sheet in correlation technique;
Fig. 3 is the schematic diagram of diffusion sheet particle to the refraction of light;
Fig. 4 is the schematic diagram of a kind of directly-down liquid crystal module of the application;
Fig. 5 is the schematic diagram of a kind of directly-down liquid crystal module in correlation technique;
Fig. 6 is the light path schematic diagram of the central area of directly-down liquid crystal module in correlation technique;
Fig. 7 is the light path schematic diagram of four angular zones of directly-down liquid crystal module in correlation technique;
Fig. 8 is the schematic diagram of the another kind of directly-down liquid crystal module of the application;
Fig. 9 is the application's diffusion sheet surface coated particle grain size distribution;
Figure 10 is the diffusion effect schematic diagram of the diffusion sheet shown in Fig. 9.
Embodiment
For enabling above-mentioned purpose, the feature and advantage of the application more become apparent, below in conjunction with the drawings and specific embodiments, the application is described in further detail.
With reference to Fig. 1, show a kind of diffusion sheet of the application.This diffusion sheet can be used in directly-down liquid crystal module.This diffusion sheet comprises: diffusion glue-line, this diffusion glue-line comprises first refractive particle and the second refracting particles, the particle diameter of first refractive particle belongs to the first particle size range, the particle diameter of the second refracting particles belongs to the second particle size range, and the mean value of the first particle size range is less than the mean value of the second particle size range; At four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles.
Diffusion sheet is mainly used to break up light and improve brightness in liquid crystal display backlight, also plays the effect of covering backlight flaw simultaneously.The structure of diffusion sheet as shown in Figure 2, with the polyethylene terephthalate (Polythyleneterephthalate of optical grade, PET) as base material, the chemical particle (as resin and PMMA particle) of optical grade is used to coat the front of PET as diffusion glue-line, diffusion particle is arranged in the upper surface of diffusion glue-line, light is spread, light through diffusion sheet can constantly in two media that refractive index is different (optical grade base material and optical grade particle) pass, there is refraction and reflection simultaneously, thus reach the effect of being broken up by light.The diffusion sheet back side also scribbles particle (as nylon (Nylon), PMMA) i.e. anti-stick layer, and the effect of backsize particle prevents from producing adsorption phenomena with blooming piece below or material.
In diffusion sheet, the particle of diffusion sheet is for the refraction of light, and the redistribution of halation, plays very important effect.As can be seen from Figure 3, for macroparticle, light is substantially according to the injection of original direction, and light inlet useful area is large, and halation is also large, so relatively bright; And small-particle diffusivity is strong, light can be broken up, halation is little, so brightness is lower when material is identical.
In the present embodiment, on four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles, that is, the refracting particles that particle diameter is large is many.Because the light of the large refracting particles place direct projection of particle diameter is more, the light be scattered is less, the brightness on four angular zones of diffusion sheet is increased, solves problem little by the luminance brightness of diffusion sheet corner in prior art.
In a preferred embodiment of the application, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is greater than the ratio that the second refracting particles accounts for total refracting particles.In the present embodiment, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is greater than the ratio that the second refracting particles accounts for total refracting particles, that is, the refracting particles that particle diameter is little is many.The light be scattered due to the refracting particles place that particle diameter is little is more, makes the brightness of the middle position of diffusion sheet and four angular zones be uniform, improves the uniformity coefficient of the light by diffusion sheet.
When specific implementation, the first particle size range and the second particle size range can have intersection, as long as the mean value that the mean value of the first particle size range is less than the second particle size range can realize the application.If the maximal value of the first particle size range is less than the minimum value of the second particle size range, then all values of the first particle size range are all less than all values of the second particle size range, now more can ensure that the macroparticle of four angular zones is more, thus the luminance brightness of four angular zones can be improved better.
Preferably, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 60%, second refracting particles accounts for total refracting particles is 20%.
Preferably, at four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 20%, second refracting particles accounts for total refracting particles is 60%.
Ratio in above-described embodiment is through the preferred ratio of testing and obtaining, under this ratio, best by the light uniformity coefficient of diffusion sheet.
It should be noted that, first refractive particle accounts for the value that quantitative proportion that the ratio of total refracting particles and the second refracting particles account for total refracting particles also can adopt other, as long as it is more to meet zone line first refractive particle, and/or four angular zone second refracting particles are more.Such as, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 70%, second refracting particles accounts for total refracting particles is 30%; And/or at four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 30%, second refracting particles accounts for total refracting particles is 70%.
Optionally, the particle diameter of the second refracting particles is 2.5 to 3 times of the particle diameter of first refractive particle.
Preferably, the first particle size range is 10-15 micron, and the second particle size range is 25-30 micron.
In another preferred embodiment of the application, first refractive particle and the second refracting particles use commaterial.Preferably, first refractive particle and the second refracting particles all use one of following material: resin, polymethylmethacrylate (polymethylmethacrylate, PMMA) and polycarbonate (Polycarbonate, PC).
To sum up, the embodiment of the present application is by changing the size of the particle of diffusion sheet corner coating, concrete, the particle diameter of diffusion sheet four angular zone particle is larger, make the light of four angular zone direct projections more, add the brightness of four angular zones, solve the problem shaded by the light of diffusion sheet corner.
As shown in Figure 4, a kind of directly-down liquid crystal module of the application is shown.This directly-down liquid crystal module can be thinner down straight aphototropism mode set, such as, and ultra-thin directly-down liquid crystal module.As shown in Figure 4, this full run-down type liquid crystal module comprises diffusion sheet, wherein, the diffusion glue-line of diffusion sheet comprises first refractive particle and the second refracting particles, the particle diameter of first refractive particle belongs to the first particle size range, the particle diameter of the second refracting particles belongs to the second particle size range, and the mean value of the first particle size range is less than the mean value of the second particle size range; At four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles.
In the present embodiment, on four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is less than the ratio that the second refracting particles accounts for total refracting particles, that is, the refracting particles that particle diameter is large is many.Because the light of the large refracting particles place direct projection of particle diameter is more, the light be scattered is less, and the brightness on four angular zones of diffusion sheet is increased, and solves the problem of directly-down liquid crystal module corner obfuscation in prior art.
In a preferred embodiment of the application, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is greater than the ratio that the second refracting particles accounts for total refracting particles.In the present embodiment, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is greater than the ratio that the second refracting particles accounts for total refracting particles, that is, the refracting particles that particle diameter is little is many.The light be scattered due to the refracting particles place that particle diameter is little is more, makes the brightness of the middle position of diffusion sheet and four angular zones be uniform, improves the display uniformity coefficient of directly-down liquid crystal module.
When specific implementation, the first particle size range and the second particle size range can have intersection, as long as the mean value that the mean value of the first particle size range is less than the second particle size range can realize the application.If the maximal value of the first particle size range is less than the minimum value of the second particle size range, then all values of the first particle size range are all less than all values of the second particle size range, now more can ensure that the macroparticle of four angular zones is more, thus the luminance brightness of four angular zones can be improved better.
Preferably, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 60%, second refracting particles accounts for total refracting particles is 20%.
Preferably, at four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 20%, second refracting particles accounts for total refracting particles is 60%.
Ratio in above-described embodiment is through the preferred ratio of testing and obtaining, and under this ratio, the display effect of directly-down liquid crystal module is best.
It should be noted that, first refractive particle accounts for the value that ratio that the ratio of total refracting particles and the second refracting particles account for total refracting particles also can adopt other, as long as it is more to meet zone line first refractive particle, and/or four angular zone second refracting particles are more.Such as, at the zone line of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 70%, second refracting particles accounts for total refracting particles is 30%; And/or at four angular zones of diffusion sheet, the ratio that first refractive particle accounts for total refracting particles is the ratio that the 30%, second refracting particles accounts for total refracting particles is 70%.
Optionally, the particle diameter of the second refracting particles is 2.5 to 3 times of the particle diameter of first refractive particle.
Preferably, the first particle size range is 10-15 micron, and the second particle size range is 25-30 micron.
In another preferred embodiment of the application, first refractive particle and the second refracting particles use commaterial.Preferably, first refractive particle and the second refracting particles all use one of following material: resin, PMMA and PC.
Preferably, liquid crystal module also comprises: prismatic lens.In specific implementation, this prismatic lens can form blooming piece with diffusion sheet, and this prismatic lens can be positioned on diffusion sheet, under also can being positioned at diffusion sheet, and can also between two diffusion sheets.When prismatic lens is positioned at above diffusion sheet, prismatic lens is between diffusion sheet and the liquid crystal panel of liquid crystal module; When prismatic lens is positioned at below diffusion sheet, prismatic lens and liquid crystal panel are positioned at the both sides of diffusion sheet, and optionally, now prismatic lens is between diffuser plate and the diffusion sheet of liquid crystal module.Wherein, prismatic lens can be a slice, also can be two panels.By arranging prismatic lens, enhance the diffusivity of liquid crystal module.
To sum up, the embodiment of the present application is by changing the size of the particle of diffusion sheet corner coating, concrete, the particle diameter of diffusion sheet four angular zone particle is larger, make the light of four angular zone direct projections more, add the brightness of four angular zones, solve the problem that directly-down liquid crystal module easily produces corner obfuscation.
As shown in Figure 5, in correlation technique, directly-down liquid crystal module comprises backboard, light source, diffuser plate, blooming piece, liquid crystal panel, drives system and structural acessory, wherein, light source adopts light emitting diode (LightEmittingDiode usually, LED), blooming piece mainly comprises diffusion sheet and/or prismatic lens.Light source led is evenly configured in the rear of liquid crystal panel as light source by directly-down liquid crystal module, makes even back be communicated to whole screen, and picture detail is more fine and smooth true to nature.
In order to realize the superthin structure of directly-down liquid crystal module, usually to reduce the thickness of backboard cavity, namely reducing the light mixing distance of LED light source, the phenomenon shaded in liquid crystal module corner will be caused like this.As shown in Figure 6 and Figure 7, at module B place, except the light below B, the light path that A and C place arrives central area B is relatively little for principle, and therefore, the brightness at B place is comparatively large, so can not shade in central area.Module C place, except the light journey below C is comparatively near, the ray traveling optical paths that A, B place is emitted through is comparatively far away, and therefore, the brightness of C place is less.Therefore, easily there is the phenomenon shaded in corner in directly-down liquid crystal module.
In order to solve this problem, this application provides a kind of directly-down liquid crystal module (directly-down liquid crystal module), as shown in Figure 8, this directly-down liquid crystal module comprises: tactic backboard, diffuser plate, diffusion sheet, prismatic lens, diffusion sheet, adhesive frame structure part and liquid crystal panel.The application improves the diffusion sheet in directly-down liquid crystal module.This diffusion sheet uses the diameter of diffusion particle (also referred to as refracting particles) to be 10 ~ 30 microns (um), as shown in Figure 9, diffusion sheet central area diffusion particle diameter distribution proportioning be 10-15um particle account for 60%, more than 25um accounts for 20%, and corner regional diffusion particle diameter distribution proportioning be 10-15um particle account for 20%, more than 25um account for 60%.From central area to peripheral regions, diffusion particle accounting even variation.
By changing particle diameter distribution proportion, the diffusion sheet diffusion effect obtained as shown in Figure 9, because central area macroparticle is few, the light of direct projection is few, the light of diffusion is many, and four angular zone macroparticles are many, so the light of direct projection is many, the light broken up is few, which solves the problem of directly-down liquid crystal module corner obfuscation.
Wherein, can prismatic lens be removed, also can remove prismatic lens and one group of diffusion sheet, arbitrarily can also remove one group of diffusion sheet.Preferably, diffusion sheet can have multilayer.
Present invention also provides a kind of liquid crystal display, this liquid crystal display comprises any one directly-down liquid crystal module above-mentioned.
The embodiment of the present application is by changing the size of the particle of diffusion sheet corner coating, concrete, the particle diameter of diffusion sheet four angular zone particle is comparatively large, makes the light of four angular zone direct projections more, add the brightness of four angular zones, solve the problem that directly-down liquid crystal module easily produces corner obfuscation.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For system embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
A kind of directly-down liquid crystal module above the application provided and liquid crystal display, be described in detail, apply specific case herein to set forth the principle of the application and embodiment, the explanation of above embodiment is just for helping method and the core concept thereof of understanding the application; Meanwhile, for one of ordinary skill in the art, according to the thought of the application, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
Claims (9)
1. a diffusion sheet, is characterized in that, comprises diffusion glue-line,
Described diffusion glue-line comprises first refractive particle and the second refracting particles, the particle diameter of described first refractive particle belongs to the first particle size range, the particle diameter of the second refracting particles belongs to the second particle size range, and the mean value of described first particle size range is less than the mean value of the second particle size range;
At four angular zones of described diffusion sheet, the ratio that described first refractive particle accounts for total refracting particles is less than the ratio that described second refracting particles accounts for total refracting particles;
At the zone line of described diffusion sheet, the ratio that described first refractive particle accounts for total refracting particles is greater than the ratio that described second refracting particles accounts for total refracting particles.
2. diffusion sheet as claimed in claim 1, it is characterized in that, the maximal value of described first particle size range is less than the minimum value of the second particle size range.
3. the diffusion sheet according to any one of claim 1 to 2, is characterized in that, the particle diameter of described second refracting particles is 2.5 to 3 times of the particle diameter of described first refractive particle.
4. the diffusion sheet according to any one of claim 1 to 2, is characterized in that, described first particle size range is 10-15 micron, and described second particle size range is 25-30 micron.
5. the diffusion sheet according to any one of claim 1 to 2, is characterized in that, described first refractive particle and described second refracting particles use commaterial.
6. diffusion sheet as claimed in claim 5, it is characterized in that, described first refractive particle and described second refracting particles all use one of following material: resin, polymetylmethacrylate and polycarbonate.
7. a directly-down liquid crystal module, is characterized in that, comprises the diffusion sheet according to any one of claim 1 to 6.
8. liquid crystal module as claimed in claim 7, it is characterized in that, described liquid crystal module also comprises: prismatic lens.
9. a liquid crystal display, comprises the liquid crystal module according to any one of claim 7 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310661550.3A CN103645524B (en) | 2013-12-06 | 2013-12-06 | A kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display |
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| CN201310661550.3A CN103645524B (en) | 2013-12-06 | 2013-12-06 | A kind of diffusion sheet, directly-down liquid crystal module and liquid crystal display |
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| CN103645524B true CN103645524B (en) | 2015-12-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5054872B2 (en) * | 2001-02-22 | 2012-10-24 | 恵和株式会社 | Light diffusion sheet and backlight unit using the same |
| JP2012068273A (en) * | 2010-09-21 | 2012-04-05 | Nitto Denko Corp | Light diffusion element, polarizer with light diffusion element, liquid crystal display device using the same, and light diffusion element manufacturing method |
| CN102081177B (en) * | 2010-12-03 | 2012-07-04 | 中国乐凯胶片集团公司 | Optical diffusion film and liquid crystal display (LCD) backlight using optical diffusion film |
| CN102508326B (en) * | 2011-11-24 | 2014-07-16 | 合肥乐凯科技产业有限公司 | Optical diffusion barrier with high haze and high brightness and liquid crystal display backlight source using optical diffusion barrier |
| CN203688833U (en) * | 2013-12-06 | 2014-07-02 | 青岛海信电器股份有限公司 | Diffusion sheet, direct type liquid crystal module and liquid crystal display device |
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Effective date of registration: 20160701 Address after: 529000, Guangdong, Jiangmen province advanced manufacturing Sand River Demonstration Park, Hisense Road, No. 8, B District, 1 blocks Patentee after: GUANGDONG HISENSE ELECTRONIC CO., LTD. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: Qingdao Hisense Electric Co., Ltd. |