WO2013044534A1 - 一种复合型光学膜片、背光模组及液晶显示装置 - Google Patents

一种复合型光学膜片、背光模组及液晶显示装置 Download PDF

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Publication number
WO2013044534A1
WO2013044534A1 PCT/CN2011/080816 CN2011080816W WO2013044534A1 WO 2013044534 A1 WO2013044534 A1 WO 2013044534A1 CN 2011080816 W CN2011080816 W CN 2011080816W WO 2013044534 A1 WO2013044534 A1 WO 2013044534A1
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WIPO (PCT)
Prior art keywords
prismatic
prism
sheet
composite optical
lower diffusion
Prior art date
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Ceased
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PCT/CN2011/080816
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English (en)
French (fr)
Inventor
张光耀
贺虎
方林冬
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/379,064 priority Critical patent/US20130083269A1/en
Publication of WO2013044534A1 publication Critical patent/WO2013044534A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a composite optical film, a backlight module, and a liquid crystal display device.
  • diaphragms mainly include diffusers (including upper diffuser (Up Diffuser) and lower diffuser (Diffuser (DF))), prismatic diaphragm BEF [including prism and lenticular] , lens [micro-lens ( ML ) ] , reflective polarizing film (DBEF ), etc., but the use of a single diaphragm to ensure high brightness, high cost angle, and the need for high-power backlight, heat, and heat Focusing on the light-bar, affecting display quality and device life.
  • diffusers including upper diffuser (Up Diffuser) and lower diffuser (Diffuser (DF)
  • DF diffuser
  • prismatic diaphragm BEF including prism and lenticular
  • lens micro-lens ( ML )
  • DBEF reflective polarizing film
  • the diaphragm combination of the reflective polarizer is not used, and the luminance gain is up to (from bottom to top): diamond lens (90°), diamond lens (0°), upper diffusion sheet (penetration rate greater than 95%),
  • the two prismatic diaphragms are placed in a cross-over structure, which causes the viewing angle to be too small, the viewing angle to exceed 40°, and the luminance to drop by more than 80%.
  • this architecture is commonly used in notebooks (personal displays) because of the small viewing angle and the TV backlight design that is not suitable for many people to watch. The relationship between the luminance of this architecture and the viewing angle can be seen in Figure 1.
  • the composite film includes a first group of prism columns 3 and a second group of prism columns 2, the first group of prism columns 3 Arranging with the second group of prism columns 2, the first group of prism columns 3 and the second group of prism columns 2 have a smooth curved top; the first group of prism columns 3 and the second group of prism columns 2 are provided with a composite film
  • the sheet 4 serves as a diffusion sheet, and the light emitted from the backlight 6 passes through the transparent support plate 5, passes through the composite type film 4, and reaches the liquid crystal display panel 1.
  • the addition of the diffusion sheet solves the problem of viewing angles of the two prismatic diaphragms, and also solves the problem of the mura taste of the light guide plate.
  • the diffusion sheet is increased, the overall brightness of the structure of the diffusion sheet + the two sets of intersecting prism groups is increased. But it is obviously reduced, so it is necessary to further study how to solve the perspective Narrow, light guide plate dot problem, can reduce the loss of luminance. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a composite optical film, a backlight module and a liquid crystal display device which have a wide viewing angle and a good display quality and a high luminance of the light guide plate.
  • a composite optical film comprising at least two prismatic membranes arranged to intersect each other, wherein the prismatic membrane is provided with a lower diffusion sheet having a high forward transmittance [Diffuser (DF)];
  • the lower diffusivity of the high diffusivity [Diffuser (DF)] is greater than 85% and less than 95%.
  • the prismatic diaphragm adopts a polyhedral structure brightness enhancement film (BEF).
  • BEF Polygon Mirror Brightness Enhancement Film
  • Cross BEF architecture is less costly with higher luminance gain.
  • the at least two mutually arranged prismatic diaphragms are selected from one or two of a prism and a lenticular.
  • the prismatic diaphragm has a prism angle of 90° ⁇ 5°.
  • the high forward transmittance lower diffuser is disposed below the prismatic diaphragm.
  • the high forward transmittance lower diffuser is disposed above the prismatic diaphragm.
  • a reflective polarizing film is further disposed above the prismatic diaphragm.
  • the composite optical film comprises a lower diffusion sheet, a first prism sheet disposed above the lower diffusion sheet, and a prism disposed above the first prism sheet and the first prism sheet.
  • a second prism sheet of an angle After research and analysis, this optical diaphragm architecture has the best luminance gain.
  • a backlight module includes a backlight and a light guide plate, and the composite optical film is further disposed on the light guide plate.
  • a liquid crystal display device includes a liquid crystal display panel, and the liquid crystal display device further includes the backlight module.
  • the present invention conducts an overall study on the relationship between the forward transmittance of the lower diffusion sheet and the luminance gain of the entire optical film in the structure formed by the lower diffusion sheet and the crossed prism type diaphragm, and determines that the height is high.
  • the forward transmittance of the lower diffuser of the transmittance is greater than 85%, and when it is less than 95%, the optical effect of the lower diffusion sheet itself can be ensured, such as the phenomenon of the dot mura by diffusion, and the composite optical
  • the diaphragm luminance gain is also significantly improved, and the backlight module can also achieve a suitable brightness.
  • FIG. 1 is a block diagram of a prior art composite optical film
  • Figure 2 is a graph of individual luminance gain comparison of various optical films
  • Figure 3 is a luminance gain diagram of the lower diffuser [Diffuser (DF);] introduced into the cross prism film structure;
  • Figure 5 is a plot of luminance gain for a Diffiiser (DF) with different forward transmittances in a crossed prismatic diaphragm architecture.
  • DF Diffiiser
  • Up Diffiiser upper diffuser
  • Diffiiser (DF) lower diffuser
  • lenticular lens
  • prism prism
  • DBEF reflective polarizer
  • BEF multi-mirror structure brightening film
  • LTC_0 (lens sheet is 0. angle placed); LTC-90 (lens sheet is placed at an angle of 90°);
  • PR_0 the prism sheet is placed at an angle of 0°
  • PR_90 the prism sheet is placed at an angle of 90°
  • the liquid crystal display device includes a liquid crystal display panel with a backlight module.
  • the backlight module generally includes a backlight, a light guide plate and a composite optical film.
  • the invention studies various diaphragms in optical films of various structures to obtain a wide viewing angle, and the display quality of the light guide plate is good, and the brightness is high, and the liquid crystal display device can be better.
  • a composite optical film required for luminance is provided.
  • optical films currently available on the market are: lenticular, prism, reflective
  • Fig. 3 shows the luminance gain brought about by the use of various conventional diaphragms alone. However, the luminance gain is affected by many factors. The luminance gain of a composite optical film is different from the luminance gain of each diaphragm when it is used alone.
  • a prismatic diaphragm comprising at least two mutually arranged prismatic diaphragms and a Diffbser (DF) optical diaphragm attached thereto
  • the viewing angle and the display taste of the light guide plate can all meet better requirements, but
  • the use of the diffuser [Diffuser (DF)] causes its luminance to drop.
  • Figure 4 shows the use of two mutually arranged prismatic diaphragms (BEF*2), two prismatic diaphragms arranged one above the other, with upper and lower diffusers (BEF*2+DF) added above, in two A diffuser (BEF+DF+BEF) is added between the prismatic diaphragms which are arranged at the same time, and a lower diffuser (DF+BEF*2) is added under the two prismatic diaphragms which are arranged at the same time.
  • Schematic diagram of the luminance gain of the optical diaphragm architecture the prism type diaphragm may be a prism sheet (PR in the figure) or a lenticular sheet (illustrated as LTC).
  • the prisms with two prisms perpendicular to each other have the best luminance gain, but regardless of the architecture, the composite optical film is added after the lower diffuser is added. The overall luminance gain of the film is significantly reduced.
  • the diffusion type diaphragm is introduced: the lower diffusion sheet [Dif ⁇ ser (DF)], and the forward transmittance of the diffusion film itself affects the gray gain of the overall diaphragm structure.
  • the forward transmittance of the increased lower diffusion sheet and the luminance of the integrated composite optical film are studied: as shown in Fig. 5, now in two mutually intersecting settings (DF+BEF*2) of the lower diffuser of model DI-700A is placed under the prism diaphragm as the embodiment, and the brightness of the composite optical film with DI-700A+LTC-90+LTC-0 structure is adopted.
  • DF+BEF*2 mutually intersecting settings
  • Correction page (Article 91) The change in luminance gain of the entire diaphragm under the rate of penetration. As can be seen from the data in the figure, as the forward transmittance increases, the luminance gain of the optical film increases accordingly.
  • a first prism sheet (PR-0) is disposed on a lower diffusion sheet, and a second prism sheet (PR-90) at an angle of ninety degrees to the prism of the first prism sheet is further disposed on the optical sheet.
  • the luminance gain of the diaphragm architecture is best. As the transmittance of the lower diffuser increases, the visible gain gain increases, and the effect of the mask masking mum is further considered.
  • This architecture avoids the commonly used lower diffuser (transmission rate is 72-80%), and commonly used Diffusion sheet (transmission rate greater than 95%), under the cross-beam structure, using a lower diffuser with a forward transmittance of more than 85% and less than 95%, to achieve brightness, taste, and viewing angle optimization the design of.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

本发明公开一种复合型光学膜片、背光模组及液晶显示装置，复合型光学膜片包括至少两个相互交叉设置的棱镜式膜片，其中棱镜式膜片上还附有高正向穿透率的下扩散片；高正向穿透率的下扩散片的正向穿透率大于85%，小于95%。本发明通过对下扩散片和交叉棱镜式膜片所形成的架构中，下扩散片的正向穿透率与整体光学膜片的辉度增益之间的关系进行整体研究，确定出当高正向穿透率的下扩散片的正向穿透率的合适范围，不仅可以保证下扩散片本身的光学作用，而且复合型光学膜片辉度增益还有明显提高，还能使背光模组达到较合适的辉度。

Description

一种复合型光学膜片、 背 组及液晶显示装置
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种复合型光学膜片、 背光 模组及液晶显示装置。
【背景技术】
背光模组在 LCD显示中的作用十分重要， 而背光模组中的光学膜片的使用 是提升背光亮度及均匀性的关键。 常用的膜片主要有扩散片 （其中包括上扩散 片 （Up Diffuser )和下扩散片 [ Diffuser ( DF ) ] ), 棱镜式膜片 BEF [ 其中包括 棱镜片 （prism )和透镜片 （lenticular ) ] , 透镜片 [ micro-lens ( ML ) ] , 反射 式偏光膜片 （DBEF )等， 但是采用单一膜片要保障高辉度， 成本角高， 而且需 要高功率的背光源， 发热大， 并且热量集中在导光条（light-bar ) 附近， 影响显 示品质和器件的使用寿命。 如何利用适当的膜片组合， 使辉度增益最佳化， 成 为背光设计一大重点。 目前不采用反射式偏光片的膜片组合， 辉度增益最高为 (由下而上）： 菱镜片 （90° )、 菱镜片（0°)、 上扩散片（穿透率大于 95%), 而两张 棱镜式膜片交叉摆放的架构， 会导致显示视角过小， 视角超过 40°, 辉度下降超 过 80%。 但这种架构常见于笔记本（个人显示器）使用， 因为视角小， 不适多 人一起观赏的电视背光设计。 此架构的辉度与视角的关系可参见附图 1。
中国专利申请号 200910127865.3公开了一种复合型光学膜片， 其结构如图 2所示： 该复合型膜片包括第一组棱镜柱 3及第二组棱镜柱 2, 该第一组棱镜柱 3与第二组棱镜柱 2交叉设置，第一组棱镜柱 3与第二组棱镜柱 2具有平滑曲面 的顶部； 该第一组棱镜柱 3与第二组棱镜柱 2的下方设置有复合型膜片 4作为 扩散片， 背光源 6发出的光线经过透明支撑板 5 , 再经过该复合型膜片 4, 抵达 液晶显示面板 1。 增加扩散片虽解决了两张棱镜式膜片交叉摆放的视角问题， 也 解决了导光板网点 mura品味问题， 但扩散片增加后， 扩散片 +两组交叉的棱镜 组的架构的整体辉度却明显降低了， 因此有必要进一步研究如何既能解决视角 窄， 导光板网点问题， 又能减小辉度的损失。 发明内容
本发明所要解决的技术问题是提供一种视角较广， 导光板的显示品味较好、 辉度又较高的复合型光学膜片、 背光模组及液晶显示装置。
本发明的目的是通过以下技术方案来实现的：
一种复合型光学膜片， 包括至少两个相互交叉设置的棱镜式膜片， 其中， 所 述棱镜式膜片上附有高正向穿透率的下扩散片 [ Diffuser ( DF ) ]; 所述高正向穿 透率的下扩散片 [ Diffuser ( DF ) ]的正向穿透率大于 85% , 小于 95%。
优选的， 所述棱镜式膜片采用多菱镜结构增亮膜（ BEF )。 采用 Cross BEF架 构的多菱镜结构增亮膜（BEF )在保障较高辉度增益的情况下， 成本较低。
优选的， 所述至少两个相互交叉设置的棱镜式膜片在棱镜片 （prism )和透镜 片 （lenticular ) 中选用一种或两种。
优选的， 所述的棱镜式膜片的棱镜角度为 90° ± 5° 。
优选的， 所述高正向穿透率的下扩散片设置在棱镜式膜片的下方。
优选的， 所述高正向穿透率的下扩散片或设置在棱镜式膜片的上方。
优选的， 所述的棱镜式膜片的上方还设有反射式偏光膜片（DBEF)。
优选的， 所述的复合型光学膜片包括一张下扩散片、 一张设置在下扩散片上 方的第一棱镜片及一张设置在第一棱镜片上方与第一棱镜片的棱镜呈九十度夹 角的第二棱镜片。 经过研究分析， 这种光学膜片架构的辉度增益最好。
一种背光模组， 包括背光源、 导光板， 所述导光板上面还设有上述复合型光 学膜片。
一种液晶显示装置， 包括液晶显示面板， 所述液晶显示装置还包括上述背光 模组。
本发明通过对下扩散片和交叉棱镜式膜片所形成的架构中， 下扩散片的正向 穿透率与整体光学膜片的辉度增益之间的关系进行整体研究， 确定出当高正向 穿透率的下扩散片的正向穿透率大于 85%, 小于 95%的范围内时， 不仅可以保 证下扩散片本身的光学作用， 如通过扩散来解决网点 mura等现象， 而且复合型 光学膜片辉度增益还有明显提高， 还能使背光模组达到较合适的辉度。
【附图说明】
图 1是现有技术的复合型光学膜片的架构图；
图 2是各种光学膜片的单独的辉度增益对比图；
图 3是在交叉式棱镜膜片架构中引入下扩散片 [ Diffuser ( DF )；]的辉度增益 图；
图 5是不同正向穿透率的下扩散片 [ Diffiiser ( DF ) ]在交叉式棱镜膜片架构 中的辉度增益图。
其中： 1、 液晶显示面板； 2、 第一棱镜（prism )柱； 3、 第二棱镜（prism ) 柱； 4、 复合型光学膜片； 5、 透明支撑板； 6、 背光源；
Up Diffiiser: 上扩散片； Diffiiser(DF): 下扩散片； lenticular: 透镜片； prism: 棱镜； DBEF: 反射式偏光膜； BEF: 多菱镜结构增亮膜；
LTC_0 (透镜片呈 0。角度放置）； LTC— 90 (透镜片呈 90°角度放置）；
PR_0 (棱镜片呈 0° 角度放置）； PR_90 (棱镜片呈 90° 角度放置）。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
液晶显示装置中包括有带有背光模组的液晶显示面板， 背光模组中， 通常包括 有背光源、 导光板及复合型光学膜片。 本发明通过对各种架构的光学膜片中的 各种膜片进行研究， 以获得一种视角较广， 导光板的显示品味较好、 辉度又较 高可以达到液晶显示装置的较好的辉度要求的复合型光学膜片。
目前市面上常见的光学膜片有： 透镜片 （lenticular ), 棱镜片 （prism ), 反射式
3
更正页 （细则第 91条) 偏光膜（DBEF)等， 图 3即示出了各种常用膜片单独使用时所带来的辉度增益。 但辉度增益是受诸多因素影响的， 一组复合型光学膜片所带来的辉度增益与每 个膜片单独使用时所带来的辉度增益是不同的。
对于包括至少两个相互交叉设置的棱镜式膜片及附有下扩散片 [Diffbser (DF) ] 光学膜片来说， 其视角及导光板的显示品味都可以达到较好的要求， 但是由于 下扩散片 [Diffuser (DF) ]的使用， 使得其辉度下降。
图 4即示出了采用两个相互交叉设置的棱镜式膜片 （BEF*2)、 两个相互交叉设 置的棱镜式膜片在上方加设上下扩散片 （BEF*2+DF)、 在两个相互交叉设置的 棱镜式膜片之间加设下扩散片 （BEF+DF+BEF)、 在两个相互交叉设置的棱镜式 膜片下方加设下扩散片 （DF+BEF*2)四种光学膜片架构的辉度增益示意图。 其 中， 棱镜式膜片可选用棱镜片 （prism, 图中示意为 PR)或透镜片 （lenticular, 图中示意为 LTC)。 从图中数据可知， 釆用两个棱镜方向互相垂直的棱镜片 (prism) 的辉度增益最佳， 但不管是哪种架构， 在增加了下扩散片 （Diffiiser) 后， 其复合型光学膜片的整体辉度增益都明显降低。
在包括至少两个相互交叉设置的棱镜式膜片及附有下扩散片 [Diffuser (DF) ]的 CrossBEF架构中， 经过研究， 由于 BEF的上表面是水平或者竖直的棱镜结构， 它会将竖直或者水平方向的光向中心聚光， 经过 BEF汇聚后的光线， 再经过其 它扩散型膜片时， 会受到散射或者反射， 就会让竖直方向的增益衰减， 且膜片 材料也会吸收一部分光线， 因此， 引入扩散型膜片： 下扩散片[Difϊ ser(DF)], 扩散性膜片本身的正向穿透率的高低就对整体膜片架构的灰度增益情况发生影 响。 其中， 所述正向穿透率为膜片出射光强度与入射光强度的比值， 即示为： Tr%= [出射 /1入射。
故在交叉菱镜膜片架构中， 对增加的下扩散片的正向穿透率与整体复合型光学 膜片的辉度进行研究： 如图 5 所示， 现以在两个相互交叉设置的棱镜式膜片下 方加设型号为 DI-700A 的下扩散片 的 （ DF+BEF*2 ) 为实施例， 以 DI-700A+LTC— 90+LTC—0 架构的复合型光学膜片的辉度为基准， 分析各正向穿
4
更正页 （细则第 91条) 透率下膜片整体的辉度增益的变化情况。 从图中数据可知， 随着正向穿透率的 提高， 光学膜片的辉度增益也会相应上升。 其中， 在一张下扩散片上设第一棱 镜片 （PR— 0 ) , 其上再设与第一棱镜片的棱镜呈九十度夹角的第二棱镜片 ( PR— 90 ), 这种光学膜片架构的辉度增益最好。 随着下扩散片穿透率提高， 可 见辉度增益提高， 再综合考虑膜片遮蔽 mum 的效果， 本架构避开常用的下扩散 片（穿透率在 72~80%), 以及常用的上扩散片（穿透率大于 95%), 在交叉菱镜结 构下， 采用正向穿透率在大于 85%, 小于 95%的范围内的下扩散片， 达到辉度、 品味、 视角最佳化的设计。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不能认 定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通技术 人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单推演或替换， 都应当视为属于本发明的保护范围。
5
更正页 （细则第 91条)

Claims

权利要求
1、 一种复合型光学膜片， 包括： 至少两个相互交叉设置的棱镜式膜片， 所 述棱镜式膜片上附有高正向穿透率的下扩散片； 所述下扩散片的正向穿透率大 于 85%, 小于 95%。
2、 如权利要求 1所述的一种复合型光学膜片， 其特征在于， 所述棱镜式膜 片采用多菱镜结构增亮膜。
3、 如权利要求 2所述的一种复合型光学膜片， 其特征在于， 所述至少两个 相互交叉设置的棱镜式膜片在棱镜片和透镜片中选用一种或两种。
4、 如权利要求 1所述的一种复合型光学膜片， 其特征在于， 所述的棱镜式 膜片的棱镜角度为 90。 ± 5。 。
5、 如权利要求 1所述的一种复合型光学膜片， 其特征在于， 所述下扩散片 设置在棱镜式膜片的下方。
6、 如权利要求 1所述的一种复合型光学膜片， 其特征在于， 所述下扩散片 设置在棱镜式膜片的上方。
7、 如权利要求 1所述的一种复合型光学膜片， 其特征在于， 所述的棱镜式 膜片的上方还设有反射式偏光膜片。
8、 如权利要求 4所述的一种复合型光学膜片， 其特征在于， 所述的复合型 光学膜片包括一张下扩散片、 一张设置在下扩散片上方的第一棱镜片及一张设 置在第一棱镜片上方与第一棱镜片的棱镜呈九十度夹角的第二棱镜片。
9、 一种背光模组， 包括背光源、 导光板， 所述导光板上面设有如权利要求 1所述的复合型光学膜片； 所述复合型光学膜片， 包括： 至少两个相互交叉设置 的棱镜式膜片， 所述棱镜式膜片上附有高正向穿透率的下扩散片； 所述下扩散 片的正向穿透率大于 85% , 小于 95%。
10、 如权利要求 9所述的一种背光模组， 其特征在于， 所述棱镜式膜片采 用多菱镜结构增亮膜。
11、 如权利要求 10所述的一种背光模组， 其特征在于， 所述至少两个相互 交叉设置的棱镜式膜片在棱镜片和透镜片中选用一种或两种。
12、 如权利要求 9所述的一种背光模组， 其特征在于， 所述的棱镜式膜片 的棱镜角度为 90。 ± 5。 。
13、 如权利要求 9所述的一种背光模组， 其特征在于， 所述下扩散片设置 在棱镜式膜片的下方。
14、 如权利要求 9所述的一种背光模组， 其特征在于， 所述下扩散片设置 在棱镜式膜片的上方。
15、 如权利要求 9所述的一种背光模组， 其特征在于， 所述的棱镜式膜片 的上方还设有反射式偏光膜片。
16、 如权利要求 12所述的一种背光模组， 其特征在于， 所述的复合型光学 膜片包括一张下扩散片、 一张设置在下扩散片上方的第一棱镜片及一张设置在 第一棱镜片上方与第一棱镜片的棱镜呈九十度夹角的第二棱镜片。
17、 一种液晶显示装置， 包括： 液晶显示面板， 所述液晶显示装置包括如 权利要求 9所述的背光模组， 所述背光模组， 包括： 背光源、 导光板， 所述导 光板上面设有复合型光学膜片； 所述复合型光学膜片包括： 至少两个相互交叉 设置的棱镜式膜片， 所述棱镜式膜片上附有高正向穿透率的下扩散片； 所述下 扩散片的正向穿透率大于 85%, 小于 95%。
18、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述棱镜式膜 片采用多菱镜结构增亮膜。
19、 如权利要求 18所述的一种液晶显示装置， 其特征在于： 所述至少两个 相互交叉设置的棱镜式膜片在棱镜片和透镜片中选用一种或两种。
20、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述的棱镜式 膜片的棱镜角度为 90。 ± 5。 。
21、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述下扩散片 设置在棱镜式膜片的下方。
22、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述下扩散片 设置在棱镜式膜片的上方。
23、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述的棱镜式 膜片的上方还设有反射式偏光膜片。
24、 如权利要求 20所述的一种液晶显示装置， 其特征在于， 所述的复合型 光学膜片包括一张下扩散片、 一张设置在下扩散片上方的第一棱镜片及一张设 置在第一棱镜片上方与第一棱镜片的棱镜呈九十度夹角的第二棱镜片。
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1703651A (zh) * 2002-10-03 2005-11-30 通用电气公司 用于平板显示的体漫射体
US20050275767A1 (en) * 2004-06-11 2005-12-15 Chi-Jen Huang Flat panel display
CN101208557A (zh) * 2005-06-24 2008-06-25 出光兴产株式会社 光扩散板及使用该板的照明装置
CN101285902A (zh) * 2007-04-11 2008-10-15 颖台科技股份有限公司 扩散板组
CN101329417A (zh) * 2007-05-21 2008-12-24 罗门哈斯丹麦金融有限公司 薄膜本体和表面漫射体
CN101852876A (zh) * 2009-04-02 2010-10-06 财团法人工业技术研究院 复合型光学膜片以及面光源模块

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4573946B2 (ja) * 2000-05-16 2010-11-04 株式会社きもと 光拡散性シート
KR100716143B1 (ko) * 2005-09-05 2007-05-10 도레이새한 주식회사 광확산 필름
KR100716144B1 (ko) * 2005-10-21 2007-05-10 도레이새한 주식회사 박막트랜지스터 액정디스플레이용 확산시트
CN101271216A (zh) * 2007-03-19 2008-09-24 瀚宇彩晶股份有限公司 液晶显示器装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1703651A (zh) * 2002-10-03 2005-11-30 通用电气公司 用于平板显示的体漫射体
US20050275767A1 (en) * 2004-06-11 2005-12-15 Chi-Jen Huang Flat panel display
CN101208557A (zh) * 2005-06-24 2008-06-25 出光兴产株式会社 光扩散板及使用该板的照明装置
CN101285902A (zh) * 2007-04-11 2008-10-15 颖台科技股份有限公司 扩散板组
CN101329417A (zh) * 2007-05-21 2008-12-24 罗门哈斯丹麦金融有限公司 薄膜本体和表面漫射体
CN101852876A (zh) * 2009-04-02 2010-10-06 财团法人工业技术研究院 复合型光学膜片以及面光源模块

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