WO2015074338A1 - 用于液晶显示器的光学补偿膜及包括其的液晶显示器 - Google Patents
用于液晶显示器的光学补偿膜及包括其的液晶显示器 Download PDFInfo
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- WO2015074338A1 WO2015074338A1 PCT/CN2014/071010 CN2014071010W WO2015074338A1 WO 2015074338 A1 WO2015074338 A1 WO 2015074338A1 CN 2014071010 W CN2014071010 W CN 2014071010W WO 2015074338 A1 WO2015074338 A1 WO 2015074338A1
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- Prior art keywords
- film
- optical path
- path difference
- degrees
- thickness
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 123
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 68
- 238000010521 absorption reaction Methods 0.000 claims description 30
- 230000010287 polarization Effects 0.000 claims 1
- FBWNMEQMRUMQSO-UHFFFAOYSA-N tergitol NP-9 Chemical compound CCCCCCCCCC1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 FBWNMEQMRUMQSO-UHFFFAOYSA-N 0.000 abstract 4
- 239000010408 film Substances 0.000 description 129
- 230000000694 effects Effects 0.000 description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 description 7
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910052707 ruthenium Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/202—LCD, i.e. liquid crystal displays
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/03—Number of plates being 3
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/06—Two plates on one side of the LC cell
Definitions
- the present invention relates to the field of liquid crystal display technology, and in particular to an optical compensation film for a liquid crystal display and a liquid crystal display including the same. Background technique
- Contrast is the ratio of the brightness of the display to the degree of darkness.
- the dark state is not enough to be the main factor affecting the contrast of the liquid crystal display.
- TFT-LCD thin film transistor liquid crystal display
- the contrast of the picture is continuously reduced, and the sharpness of the picture is correspondingly reduced.
- Compensation with a wide viewing angle compensation film can effectively reduce the light leakage of the dark state picture, and can greatly improve the contrast of the picture within a certain angle of view.
- the compensation principle of the compensation film is to correct the phase difference generated by the liquid crystal at different viewing angles, so that the birefringence property of the liquid crystal molecules is compensated for symmetry.
- the compensation film used is different, and the compensation film used for large-size LCD TVs is mostly for the vertical alignment (VA) display mode.
- VA vertical alignment
- Fig. 2 shows the full view contrast distribution map.
- the liquid crystal optical path difference, the liquid crystal pretilt angle, and the compensation values of the A film (positive hyperbolic uniaxial A plate) and the C film (negative hyperbolic uniaxial C-plate) are shown in Table 1. Shown.
- the present invention proposes an optical compensation film for a liquid crystal display for reducing light leakage and increasing contrast.
- the inventors have found through research that the compensation values of the first C film, the second C film and the A film in the compensation film have an effect on the effect of the compensation film to reduce light leakage, and compensated by the retardation optical path difference of the A film in the compensation film.
- the value (R A m ), the optical path difference compensation value (Rth A ) in the thickness direction, and the optical path difference compensation value in the thickness direction of the C film (Rth c ⁇ take a value within a specific range, and they can be matched with each other to obtain
- the best effect of reducing light leakage is that the A film represents a positive hyperbolic uniaxial A plate , and the C film represents a negative hyperbolic uniaxial C- plate.
- the present invention provides an optical compensation film for a liquid crystal display.
- the compensation film includes: a first c film disposed on one side of the liquid crystal panel, disposed outside the first c film a - - a polarizer, and a second C film disposed on the other side of the liquid crystal panel, disposed outside the second C film
- ⁇ is the optical path difference compensation value Rih A in the thickness direction of the ruthenium film.
- the dark state light leakage phenomenon in the prior art is effectively alleviated without sacrificing the light transmittance of the liquid crystal panel, and the contrast ratio at a large viewing angle (non-horizontal vertical azimuth angle) can be effectively increased. Image clarity.
- the slow axis of the first C film is perpendicular to the absorption axis of the first polarized light i.
- Embodiment 3 modified according to Embodiment 1 or 2, the slow axis of the A film and the second C film is perpendicular to the absorption axis of the second polarizer.
- the first polarizer The absorption axis is 0 degrees
- the slow axis of the first C film is 90 degrees
- the slow axis of the second C film is 0 degrees
- the slow axis of the A film is 0 degrees
- the second polarizer is The absorption axis is 90 degrees.
- Embodiment 5 which is improved according to any one of Embodiments 1 to 3, the absorption axis of the third polarizer is 90 degrees, and the slow axis of the first C film is 0 degree, the second C film The slow axis is 90 degrees, the slow axis of the A film is 90 degrees, and the absorption axis of the second polarizer is 0 degrees.
- the architecture of Embodiments 4 and 5 is equivalent in terms of optical properties. Other structures may be employed for the optical compensation film according to the present invention as long as the object of the present invention can be attained.
- A is controlled by changing the refractive index of the film and / or film thickness A of the inner surface of the optical path difference compensation value Ro Ag ⁇ n glazing thickness direction retardation film A compensation value Rih A 3 ⁇ 43 ⁇ 4, by changing the first
- the refractive index and/or thickness of the C film and the second C film are used to control the retardation value Rthc ⁇ in the thickness direction of the first C film and the second C film, respectively, wherein ⁇ and N y are corresponding films
- the refractive index in the plane direction, the X and y directions are orthogonal to each other, ⁇ is the refractive index of the corresponding film in the thickness direction, d is the thickness of the corresponding film, and Ho and Rth are the in-plane of the corresponding film, respectively.
- the present invention also provides a liquid crystal display comprising the above optical compensation film, wherein: the optical compensation film comprises - a first C film disposed on one side of the liquid crystal panel, and a first polarized light disposed outside the first C film a sheet, and a second C film disposed on the other side of the liquid crystal panel, an A film disposed outside the second C film, and a second polarizer disposed outside the A film, wherein
- the in-plane retardation compensation value of the A film the range of Ro A is: 92 nm ⁇ Ro A « ⁇ 184 nm, and the thickness of the A film is in the range of the optical path difference compensation value Rth A : 46 nm ⁇ Rth A ⁇ 92 nm !
- ⁇ 2 -0.00003945 ⁇ +0.010772 ⁇ 3 -1.1044 ⁇ 2 +50.3833 ⁇ -725.5, where ⁇ is the optical path difference compensation value Rth A si in the thickness direction of the ruthenium film.
- a slow axis of the first C film is perpendicular to an absorption axis of the first partial light film, and a slow axis of the A film and the second C film is opposite to the first The absorption axis of the two polarizers is vertical.
- the range of the liquid crystal optical path difference LCANd of the liquid crystal panel is: 305.8iim ⁇ LCANd ⁇ 324.3nm, and the liquid crystal pretilt angle of the liquid crystal panel ranges from 85° ⁇ pretilt Corner,. .
- Figure 2 shows a full-view contrast distribution map of the A plate and C-piate compensation values as described in the Background section of the prior art
- FIG. 3 is a schematic view showing the structure of an optical compensation film for a liquid crystal display according to the present invention
- FIG. 4 is a view showing a tendency of a maximum dark state light leakage amount with a compensation value at different pretilt angles when the liquid crystal optical path difference is 305.8 nm -
- Fig. 5 shows the tendency of the maximum dark state light leakage amount with the compensation value under different pretilt angles when the liquid crystal optical path difference is 324, 3mn;
- Figure 6 is a view showing a dark state full-view light leakage distribution map in the first embodiment of the present invention.
- Figure 7 shows a full-view contrast distribution map in the first embodiment of the present invention
- Figure 8 is a view showing a dark state full-view light leakage distribution map in a second embodiment of the present invention
- Figure 9 is a view showing a full-view contrast distribution map in the second embodiment of the present invention.
- Figure 10 is a view showing a dark state full-view light leakage distribution map in the first embodiment of the present invention.
- Fig. 1 shows a full-view contrast distribution map in the third embodiment of the present invention.
- an optical compensation film for a liquid crystal display includes a first C film disposed on one side of the liquid crystal panel, a first polarizer (PVA polyvinyl alcohol layer) disposed outside the first C film, and a second C film disposed on the other side of the liquid crystal panel, an A film disposed outside the second C film, and a second polarizer (PVA polyacetal layer) disposed outside the A film.
- a first polarizer PVA polyvinyl alcohol layer
- PVA polyacetal layer PVA polyacetal layer
- the optical compensation film according to the present invention can adopt the following two structures - the optical compensation film according to the present invention can have an absorption axis of 0 degrees for the upper polarizer and 90 degrees for the absorption axis of the lower polarizer (compensation structures 1 and 2).
- the present invention is in the case where the slow axis of the A film and the C film are perpendicular to the absorption axis of the polyethylene glycol (PVA) layer on the same side of the liquid crystal panel (ceU), respectively.
- PVA polyethylene glycol
- the present invention also proposes the following compensation architectures three and four -
- the above angle may be the angle of the axis relative to the set plane.
- the compensation values of A piate and C-piate are:
- the effect of optical compensation film on reducing dark state light leakage It has an effect, so you can simulate the dark state light leakage by matching the compensation values of different A-piate and C-piate, and then find the optimal compensation value range corresponding to the dark state light leakage that can be tolerated.
- the structure of the optical compensation film to be used for the liquid crystal display is as shown in Fig. 3, which is the first C film disposed on one side of the liquid crystal panel. a first polyvinyl alcohol layer outside the first C film, and a second C film disposed on the other side of the liquid crystal panel, an A film disposed outside the second C film, and a portion disposed outside the A film A layer of polyvinyl alcohol.
- the slow axis of the A-piate and the C-plate is perpendicular to the absorption axis of the polyvinyl alcohol layer on the same side of the liquid crystal panel (cdi), respectively.
- the range of the pretilt angle is: 85 ⁇ pretilt angle ⁇ 90° ; four domain (domain) liquid crystal tilt angle 45°; liquid crystal optical path difference LCANd value range is: 305, 8 nm 5; LCAN ⁇ 324.3 rm
- Blue-YAG laser spectrum is excited by blue light; the central brightness is set to 100 nits ("it"; the light source distribution is Lambert's distribution.
- the dark state light leakage is simulated by matching the compensation values of different A-p!ate and C-piate. happening.
- FIG. 4 shows the tendency of the maximum dark state light leakage amount with the compensation value at different pretilt angles when the liquid crystal optical path difference is 305.8 nm
- FIG. 5 shows that the liquid crystal optical path difference is 324.3 ⁇ m.
- the trend of the maximum dark state light leakage at different pretilt angles varies with the compensation value.
- Figures 4 and 5 are simulated with different A-plate and C plaie compensation values for different liquid crystal optical path differences and different pretilt angles. It can be seen that A-plaie and C-plate compensation values are obtained at different pretilt angles. The trend toward the dark state of light leakage is consistent. That is, under different pretilt angles, the corresponding compensation value range is the same when the dark state light leakage is minimum.
- liquid crystal: optical path difference LCANd has a value range of: 305.8 nm ⁇ LCANd ⁇ 324.3 nm
- liquid crystal pretilt angle ranges from: 85° ⁇ pretilt angle ⁇ 90° ⁇ ! (pretilt angle used) Including 89°)
- Table 2 the optimal compensation value range of A-plate and C-piate corresponding to optical compensation film when dark state light leakage is below 0.2 ⁇ is shown in Table 2:
- ⁇ is the optical path difference compensation value Rth AJ3 ⁇ 4 in the thickness direction of the ruthenium film .
- the pretilt angle is: 85 ⁇ pretilt angle ⁇ ⁇
- the range of best compensation values is as described above, as shown in Table 2.
- the appropriate compensation range is found, and the in-plane optical path difference compensation value (Ro) is known.
- the optical path difference compensation value (Rth) and the refractive index N and thickness d in the thickness direction are as follows:
- the compensation value can be changed by the following three methods - Method 1: on the basis of the current A-piate and C-plate refractive index N, the compensation value is changed by changing the thickness d;
- Method 2 On the basis of the current A-plate and C-plate, change the refractive index N to change the compensation value.
- Method 3 On the basis of ensuring the compensation range of A-plate and C plate, the thickness d and the refractive index N are simultaneously changed to change the compensation value.
- the in-plane optical path difference compensation value R 0A Si of the ruthenium film is controlled by changing the refractive index and ⁇ or thickness of the ruthenium film.
- the optical path difference compensation value Rth A in the thickness direction of the A film, and the thicknesses of the first C film and the second C film are controlled correspondingly by changing the refractive index and/or thickness of the first C film and the second C film.
- the upper optical path difference compensation value Rlh C where H ⁇ BN y is the refractive index of the corresponding film in the in-plane direction, X and y square are orthogonal to each other, and ⁇ is the refractive index of the corresponding film in the thickness direction, d is the thickness of the corresponding film, and Roheli Rth is further divided into the in-plane retardation retardation value and the thickness-incremental retardation retardation value of the corresponding film.
- optical compensation film proposed by the present invention the following examples were also proposed, which were compared with the comparative examples in the prior art listed in the dry and comparative documents.
- the compensation values of the A-plate and the C plate in the optical compensation film are changed according to the present invention to compare the dark state light leakage and Full view contrast distribution.
- the in-plane optical path difference compensation value Ro of the three sets of A-plate and C plate and the optical path difference compensation value Rth in the thickness direction are selected :
- Fig. 6 shows a dark state full-view light leakage distribution map in which the first one is performed
- Fig. 7 shows a full-view contrast distribution map of the first embodiment.
- FIG. 8 shows the dark state full-view light leakage distribution map of the second embodiment
- FIG. 9 shows the full-view contrast distribution map of the second embodiment.
- Fig. 10 shows a dark state full-view light leakage distribution map of the third embodiment
- Fig. 1 shows a full-view contrast distribution map of the third embodiment.
- FIG. 6, FIG. 8 and FIG. 10 and FIG. 3 corresponding to the first embodiment, the second embodiment and the third embodiment, respectively, it can be found that the maximum compensation value of the A-piate and the C-plate of the optical compensation film is improved.
- the dark state light leakage is reduced from 2.3 mt to 0.2 nit, which is much lower than the dark state light leakage obtained by the optical compensation film in the prior art.
- the present invention also proposes a liquid crystal display comprising the above optical compensation film.
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Abstract
一种用于液晶显示器的光学补偿膜,属于液晶显示技术领域,包括:设置在液晶面板一侧的第一C膜,置于第一C膜外侧的第一偏光片,以及设置在液晶面板另一侧的第二C膜,置于第二C膜外侧的A膜以及置于A膜外侧的第二偏光片,其中A膜的面内光程差补偿值处于[92,184]nm的范围内,A膜的厚度方向上光程差补偿值处于[46,92]nm的范围内。通过该光学补偿膜,改善了暗态漏光分布和显示器的对比度。还提供了一种包括所述光学补偿膜的液晶显示器。
Description
用于液晶显示器的光学补偿膜及包括其的液晶显示器 技术领域
本发明涉及液晶显示技术领域, 特别是涉及一种用于液晶显示器的光学补 偿膜及包括其的液晶显示器。 背景技术
就液晶显示器的应用而言, 对比度的高低很大程度上影响着其在市场上的 认可程度。 对比度即为显示器亮态程度与暗态程度的比值。 一般而言, 暗态不够 暗是影响液晶显示器对比度的主要因素。随着薄膜晶体管液晶显示器(TFT-LCD) 的观察角度增大, 画面的对比度不断降低, 画面的清晰度也会相应下降。 这是液 晶层中液晶分子的双折射率随观察角度变化而发生改变的结果。 采用宽视角补偿 膜进行补偿, 可以有效降低暗态画面的漏光, 在一定视角内可以大幅度提高画面 的对'比度。 通常, 补偿膜的补偿原理是将液晶在不同视角下产生的相位差进行修 正, 让液晶分子的双折射性质得到对称性的补偿。
针对不同的液晶显示模式, 所采用的补偿膜&不同, 大尺寸液晶电视使用 的补偿膜大多针对垂直对准 (VA) 显示模式。
针对相同的液晶光程差 (LCANd), 补偿膜的补偿值不同, 则大视角的暗态漏
:光状况就不同, 对比度也不同。
例如, 图〗显示了现有技术中在液晶光程差(LCANd) =315«m时所对应的 暗态漏光分布图, 图 2显示了全视角对比度分布图。 在图 1和图 2中, 液晶光程 差、 液晶预倾角, 以及 A膜 (正性双曲折单轴 A plate) 和 C膜 (负性双曲折单 轴 C- plate) 的补偿值如表格 1所示。
表格 1
由此可见,采用现有技术中的 A- plate与 C- plate补偿值,在暗态下采用大视
角观测会有严重漏光现象,
清渐度会受到很大影响。
针对现有技术中的液晶显示器的补偿膜减少漏光效果不理想的问题,本发明 提出了一种用于液晶显示器的光学补偿膜, 用于减少漏光并增大对比度。
发明人通过研究发现, 补偿膜中第一 C膜、 第二 C膜和 A膜的补偿值对于 补偿膜减少漏光的效果有影响,并且通过将补偿膜中的 A膜的面 ή光程差补偿值 (R A m) , 厚度方向上光程差补偿值 (RthA )以及 C膜的厚度方向上光程差补偿值 ( Rthc ^ 取特定范围内的数值, 且使它们相互配合, 可以获得最佳的减少漏光 的效果。 其中 A 膜表示正性双曲折单轴 A plate , C 膜表示负性双曲折单轴 C- plate。
因此, 本发明提出了一种用于液晶显示器的光学补偿膜, 在实施方案 1中, 该补偿膜包括: 设置在液晶面板一侧的第一 c膜, 置于所述第一 c膜外侧的第 - · 偏光片, 以及设置在所述液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的
A膜以及置于所述 A膜夕卜侧的第二偏光片, 其中所述 A膜的面内光程差补偿值 RoA 5i的范围为: 92nm≤RoA fl(≤184mn, 所述 A膜的厚度方向上光程差补偿值 RthA «的范 I为;
所述第一 C膜和第二 C膜的厚度方向上光程差 补偿值 Rthc膜取值范围均为;
而
Y ==-0.0001 325x3-r0,0636x2-6.9467x+302.28 ?
Y2--0.00003945x4+0.010772x3-l .1044χ2+50.3833χ-725.5 , 其中 χ为 Α膜的厚度方 向上光程差补偿值 RihA 。
根据上述实施方案 1, 在不必牺牲液晶面板的透光率的前提下, 有效缓解了 现有技术中的暗态漏光现象, 同时可以有效增加大视角 (非水平垂直的方位角) 下的对比度和图像清晰度。
在根据实施方案 1所改进的实施方案 2中,所述第一 C膜的慢轴与所述第一 偏光 i†的吸收轴垂直。
在根据实施方案 1或 2所改进的实施方案 3中,所述 A膜和所述第二 C膜的 慢轴与所述第二偏光片的吸收轴垂直。
在根据实施方案 1到 3中任一个所改进的实施方案 4中, 所述第一偏光片的
吸收轴呈 0度, 所述第一 C膜的慢轴呈 90度, 所述第二 C膜的慢轴呈 0度, 所 述 A膜的慢轴呈 0度, 所述第二偏光片的吸收轴呈 90度。
在根据实施方案 1到 3中任一个所改进的实施方案 5中, 所述第 ·偏光片 的吸收轴呈 90度, 所述第一 C膜的慢轴呈 0度, 所述第二 C膜的慢轴呈 90度, 所述 A膜的慢轴呈 90度, 所述第二偏光片的吸收轴呈 0度。 实施方案 4和 5的 架构在光学性质方面是等效的。 根据本发明的光学补偿膜也可以采用其它的构 架, 只要能够达到本发明的目的。
在根据实施方案 1到 5中任一个所改进的实施方案 6中, 根据公式
Ro -= ( Nx ~ Ny) * d
Rt - {(Nx + Ny) i 2 ~ Nz] * d '
通过改变所述 A膜的折射率和 /或厚度来控制 A膜的面内光程差补偿值 RoAg^n A 膜的厚度方向上光程差补偿值 RihA ¾¾,通过改变所述第一 C膜和第二 C膜的折射 率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方向上光程差补偿值 Rthc ^ , 其中 Νχ和 Ny为相应的膜在面 ή方向上的折射率, X与 y方向相互正交, ^^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ho和 Rth分别为相 应的膜的面内光程差延迟值和厚度方向光程差延迟值。
本发明还提出了一种包括上述光学补偿膜的液晶显示器, 其中所述:光学 偿膜包括- 设置在液晶面板一侧的第一 C膜, 置于所述第一 C膜外侧的第一偏光片, 以及设置在所述液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的 A膜以 及置于所述 A膜外侧的第二偏光片, 其中
所述 A膜的面内光程差补偿值 :RoA 的范围为: 92nm≤RoA «<184nm , 所述 A膜的厚度方 ^上光程差补偿值 RthA 的范围为: 46nm<RthA <92nm! 所述第一 C膜和第二 C膜的厚度方向上光程差补偿值 RthC ^值范围均为: Yinm<Rthc ^<Y2mii, 而 Yi=- 0,0001325x3+0,0636x2~6.9467x+302.28 ,
Υ2=-0.00003945χ +0.010772χ3-1.1044χ2+50.3833χ-725.5, 其中 χ为 Α膜的厚度方 向上光程差补偿值 RthA si。
在该显示器的一个实施例中, 所述第一 C膜的慢轴与所述第一偏:光片的吸 收轴垂直, 所述 A膜和所述第二 C膜的慢轴与所述第二偏光片的吸收轴垂直。
在该显示器的另一个实施例中, 所述液晶面板的液晶光程差 LCANd的范围 为: 305.8iim≤LCANd≤324.3nm , 所述液晶面板的液晶预倾角的范围为: 85°≤预倾
角,。。
在该显示器的另一个实施例中, 根据公式
?o - (.Vx - AV)* d 通过改变所述 A膜的折射率和 /或厚度来控制 A膜的面内光程差补偿值 RoA ^和 A 膜的厚度方向上光程差补偿值 RthA ^,通过改变所述第一 C膜和第二 C膜的折射 率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方 ^上光程差 偿值 R hc m, 其中 _^和^为相应的膜在面内方向上的折射率, X与 y方向相互正交, ^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro l] Rth分别为相 应的膜的面内光程差延迟值和厚度方^光程差延迟值。
实验可验证 (下面将结合附图详细说明) , 当 A膜和 C膜取本发明技术方 案中的补偿值范围日寸, 漏光分布大幅度减少, 相比现有技术拥有显著优势。 同时 对比度得到了改善, 视角范围大幅度增加。 使得在较大的视角下也可以得到清晰 的图像。
上述技术特征可以各种适合的方式组合或由等效的技术特征来替代,只要能 够达到本发明的目的。
在下文中将基于仅为非限定性的实施例并参考附图来对本发明进行更详细 的描述。 其中 - 图: ί显示了现有技术中如背景技术部分所述的 A plate与 C-piate补偿值下的 暗态漏光分布图;
图 2显示了现有技术中如背景技术部分所述的 A plate与 C-piate补偿值下的 全视角对比度分布图;
图 3显示了根据本发明的用于液晶显示器的光学补偿膜的结构示意图; 图 4显示了液晶光程差为 305.8mn时不同預倾角度下的最大暗态漏光量随 补偿值变化的趋势- 图 5显示了液晶光程差为 324,3mn时不同预倾角度下的最大暗态漏光量随 补偿值变化的趋势;
图 6显示了本发明的第一实施例中的暗态全视角漏光分布图;
图 7显示了本发明的第一实施例中的全视角对比度分布图;
图 8显示了本发明的第二实施例中的暗态全视角漏光分布图;
图 9显示了本发明的第二实施例中的全视角对比度分布图;
图 10显示了本发明的第 实施例中的暗态全视角漏光分布图;
图 1显示了本发明的第三实施倒中的全视角对比度分布图。
在图中, 相同的构件由相同的 图标记标示。 附图并未按照实际的比例绘
具体实施方式
下面将参照附图来详细地介绍本发明。
参照图 3, 根据本发明的甩于液晶显示器的光学补偿膜包括设置在液晶面板 一侧的第一 C膜, 置于第一 C膜外侧的第一偏光片 (PVA聚乙烯醇层) , 以及 设置在所述液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的 A膜以及置 于所述 A膜外侧的第二偏光片 (PVA聚乙爆醇层) 。
根据本发明的光学补偿膜可以采取如下两种架构- 根据本发明的光学补偿膜可以为上偏光片吸收轴呈 0度,下偏光片吸收轴呈 90度 (补偿架构一和二) 。
发明人在模拟时, 发现补偿架构一和二是等效的。 即在相同的补偿值下, 补 偿架构一和二对应的最大暗态漏光是一样的。
然而, 上偏:光片吸收轴呈 90度, 下偏光片吸收轴呈()度时, 在保证 偿架
构的 A膜 (Ai^ate)与 C膜 (C- plate)的慢轴分别与与其位于液晶面板(ceU) 同一侧 的聚乙浠醇 (PVA)层的吸收轴垂直的情况下, 本发明的方案依然适用。 因此, 本 发明还提出了下述补偿架构三和四-
上述角度可以为所述轴线相对于所设定平面的角度。
针对以上补偿架构, 发明人经过研究, 发现 A piate与 C- piate的补偿值(面 内光程差补偿值、 厚度方向上光程差补偿值) 对:光学补偿膜的减少暗态漏光的效 果有影响,因此可以通过搭配不同的 A- piate与 C- piate的补偿值来模拟暗态漏光, 然后找出所能够容忍的暗态漏光所对应的最佳补偿值范围。
在模拟中, 设定如下- 关于光学补偿膜的设定: 拟设的用于液晶显示器的光学补偿膜的结构如图 3 所示, 其为设置在液晶面板一侧的第一 C膜, 置于第一 C膜外侧的第一聚乙烯醇 层, 以及设置在液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的 A膜以 及置于所述 A膜外侧的第二聚乙烯醇层。其中 A- piate与 C- plate的慢轴分别与与 其位于液晶面板 (cdi)同一侧的聚乙烯醇层的吸收轴垂直。
关于液晶的设定: 預倾角的范围为: 85≤预倾角 <90°; 四域 (domain)液晶倾 角 45°; 液晶光程差 LCANd的取值范围为: 305,8nm5;LCAN^324.3rm
关于光源的设定: 使用蓝光激发钇铝石榴石荧光粉 (Blue-YAG)LED 光谱; 中央亮度设定为 100尼特 (《it); 光源分布采甩朗怕分布 (Lambert's distribution)。
在上述设定下,通过搭配不同的 A- p!ate与 C- piate的补偿值来模拟暗态漏光
情况。
分别选取液晶光程差为 305.8nm、 324.3nm? 选取液晶预倾角为 85°、 89°的 情况来进行说明。
如图 4和图 5所示, 图 4显示了液晶光程差为 305.8nm时不同预倾角度下 的最大暗态漏光量随补偿值变化的趋势, 图 5显示了液晶光程差为 324.3iim时不 同预倾角度下的最大暗态漏光量随补偿值变化的趋势。
图 4和图 5在不同的液晶光程差和不同的预倾角下搭配不同的 A-plate与 C plaie补偿值进行模拟, 可以看出在不同预倾角下, A-plaie与 C- plate补偿值对 暗态漏光的影响趋势是一致的。 即在不同预倾角下, 暗态漏光最小时对应的补偿 值范围是一样的。
因 此 获 得 了 , 当 液 晶 :光 程 差 LCANd 的 取 值 范 围 为 : 305.8nm<LCANd<324.3nm, 液晶预倾角的取值范围为: 85°≤预倾角 <90°ί! (所 采用的预倾角包括 89°),暗态漏光位于 0.2τώ以下时光学补偿膜所对应的 A- plate 与 C-piate的最佳补偿值范围如表格 2:
表格 2
其中 Yi=- 0.0001325x3十 0.0636x2 6,9467x十 302.28 ,
其中 Χ为 Α膜的厚度方向上光程差补偿值 RthAJ¾。
即当液晶光程差 LCANd的范围为: 305,8SLCANd≤524.3rsim, 预倾角的范 为: 85^预倾角〈 ^时,针对不同的光学补偿膜结构,可以通过合理搭配 A- plate 与 C- pkte的补偿值来达到理想的暗态漏光效果。最佳补偿值范围如上文所述,如 表 2所示。
找到了合适的 偿值范围, 又知道面内光程差补偿值 (Ro), 厚度方向上光程 差补偿值 (Rth)和折射率 N、 厚度 d关系如下:
Ro^(Nx- ry)*d
Rth ^^Mx+My)/2-M∑]*d
因此可以通过以下三种方法来改变补偿值- 方法一:在现行 A- piate与 C- plate折射率 N不变的基础上,通过改变厚度 d 来改变补偿值;
方法二: 在现行 A-plate与 C- plate的基础上, 改变折射率 N来改变补偿值。 方法三: 在保证 A- plate与 C plate补偿值范围的基础上, 同时改变厚度 d 和折射率 N来改变补偿值。
也就是, 可以根据公式 她 - [{Νχ + Ny) 12― Nz] * d , 通过改变所述 Α膜的折射率和 Ζ或厚度, 来控制 Α膜的面內光程差补偿值 R0A Si和 A膜的厚度方向上光程差补偿值 RthA , 通过改变第一 C膜和第二 C膜 的折射率和 /或厚度来相应地控制第一 C膜和第二 C膜的厚度方^上光程差补偿 值 RlhC , 其中 H^B Ny为相应的膜在面内方向上的折射率, X与 y方^相互正 交, ]^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro禾 li Rth分另 ij 为相应的膜的面内光程差延迟值和厚度方 ^光程差延迟值。
针对本发明所提出的光学补偿膜, 还提出了下述 个实施例, 用干与对比 文件中所列出的现有技术中的对比例进行对比。
为了和图 、图 2中所示的现有技术中的光学补偿膜所带来的效果进行对比, 根据本发明改变光学补偿膜中 A-plate与 C plate的补偿值, 来比较暗态漏光和全 视角对比度分布。
选取了 3组 A-plate与 C plate的面内光程差补偿值 Ro和厚度方向上光程差 补偿值 Rth:
图 6显示了实施倒一的暗态全视角漏光分布图; 图 7显示了实施例一的全 视角对比度分布图。
实施例二-
C-p!ate Rth之 液晶光程差 液晶预倾角 A-piate Ro A- plate Rth
和
333, 5nm 89度 132nm 66nm 206nm 图 8显示了实施例二的暗态全视角漏光分布图: 图 9显示了实施例二的全 视角对比度分布图。
图 10显示了实施例三的暗态全视角漏光分布图; 图 I 显示了实施例三的 全视角对比度分布图。
在图 6-11中:
分别与实施例一、 实施例二和实施例三所对应的图 6、 图 8和图 10与图 】做对比, 可以发现改善光学补偿膜的 A- piate与 C- plate的补偿值后, 最大暗态 漏光由 2.3mt降低到 0.2nit之内, 远低于使 ffl现有技术中光学补偿膜所得到的暗 态漏光。
由分别与实施例一、 实施例二和实施例三所对应的图 7、 图 9和图 11与图 2做对比, -可以发现改善光学补偿膜的 A-plate与 C- plate的补偿值后, 全视角对 比度分布也远胜于使用现有技术中光学补偿膜所得到的全视角对比度分布。
本发明还提出了一种包括上述光学补偿膜的液晶显示器。
虽然己经参考优选实施例对本发明进行了描述, 但在不脱离本发明的范围 的情况下, 可以对其进行各种改进共且可以用等效物替换其中的部件。 本发明并 不局限于文中公开的特定实施倒, 而是包括落入权利要求的范围内的所有技术方
Claims
1. 用于液晶显示器的光学补偿膜, 包括:
设置在液晶面板一侧的第一 C膜, 置于所述第一 C膜外侧的第一偏光片, 以及设置在所述液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的 A膜以 及置于所述 A膜外侧的第二偏光片, 其中
所述 A膜的面内光程差补偿值 RoA膜的范围为: 92m¾i:R_OA ^184nm, 所述 A膜的厚度方^上光程差补偿值 RthAJi的范围为: 46nm<R.thA K<92nni, 所述第一 C膜和第二 C膜的厚度方向上光程差补偿值 Rthc ^的范围均为-
而 Y ::- 0,()001325x3十 0.0636x2 6,9467x+302.28
Y2==-0.00003945x4+0.010772χ3-1.1044χ2+50.3833χ-725.5 , 其中 χ为 Α膜的厚度方 向上光程差补偿值 RtibA g¾。
2. 根据权利要求 1所述的光学补偿膜,其中,所述第一 C膜的慢轴与所述第 一偏光片的吸收轴垂直。
3, 根据权利要求 1所述的光学补偿膜, 其中, 所述 A膜和所述第二 C膜的 慢轴与所述第二偏光片的吸收轴垂直。
4, 根据权利要求 1所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 0 度, 所述第一 C膜的慢轴呈 90度, 所述第二 C膜的慢轴呈 0度, 所述 A膜的慢 轴呈 0度, 所述第二偏光片的吸收轴呈 90度。
5. 根据权利要求 2所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 0 度, 所述第一 C膜的慢轴呈 90度, 所述第二 C膜的慢轴呈 0度, 所述 A膜的慢 轴呈 0度, 所述第二偏光片的吸收轴呈 90度。
6. 根据权利要求 3所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 0 度, 所述第一 C膜的慢轴呈 90度, 所述第二 C膜的慢轴呈 0度, 所述 A膜的慢 轴呈 0度, 所述第二偏光片的吸收轴呈 90度。
7. 根据权利要求 1 所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 90度, 所述第一 C膜的慢轴呈 0度, 所述第二 C膜的慢轴呈 90度, 所述 A膜的 慢轴呈 90度, 所述第二偏光片的吸收轴呈 0度。
8. 根据权利要求 2 所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 90度' 所述第一 C膜的慢轴呈 0度, 所述第二 C膜的慢轴呈 90度, 所述 A膜的 慢轴呈 90度, 所述第二偏光片的吸收轴呈 0度。
9. 根据权利要求 3 所述的光学补偿膜, 其中, 所述第一偏光片的吸收轴呈 90度, 所述第一 C膜的慢轴呈 0度, 所述第二 C膜的慢轴呈 90度, 所述 A膜的 慢轴呈 90度, 所述第二偏光片的吸收轴呈 0度。
10. 根据权利要求 1所述的光学补偿膜, 其中, 根据公式
,
Rth - [(.Λ¾ + Ny) /2~Nz]*d
通过改变所述 A膜的折射率和 /或厚度来控制 A膜的面内光程差补偿值 ROA^和 A 膜的厚度方向上光程差补偿值 RthA 通过改变所述第一 C膜和第二 C膜的折射 率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方^上光程差待偿值 RihC3(, 其中 N!^ Ny为相应的膜在面内方向上的折射率, X与 y方向相互正交, ^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro和 Rth分别为相 应的膜的面内光程差延迟值和厚度方^上光程差延迟值。
11. 根据权利要求 2所述的光学补偿膜, 其中, 根据公式
Ro-=(Nx~Ny)*d
Rth - {(Nx + Ny) i 2~Nz]*d'
通过改变所述 A膜的折射率和 /或厚度来控制 A膜的面内光程差补偿值 RoA 和 A 膜的厚度方向上光程差补偿值 RihA3(,通过改变所述第一 C膜和第二 C膜的折射 率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方^上光程差补偿值
Rthcii, 其中 ^和^为相应的膜在面內方向上的折射率, X与 y方向相互正交,
^^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro和 Rth分别为相 应的膜的面内光程差延迟值和厚度方向上光程差延迟值。
12, 根据权利要求 3所述的光学补偿膜, 其中, 根据公式
Ro-=(Nx~Ny)*d
Rth - {(Nx + Ny) 12-Λ¾]*ί '
通过改变所述 Α膜的折射率和 /或厚度来控制 A膜的面内光程差补偿值 RoA rf; A 膜的厚度方向上光程差补偿值 RthA ,通过改变所述第一 C膜和第二 C膜的折射 率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方向上光程差补偿值 Rthc^, 其中 Nx和 Ny为相应的膜在面 ή方向上的折射率, X与 y方向相互正交,
^^为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro和 Rth分别为相 应的膜的面内光程差延迟值和厚度方^上光程差延迟值。
13. 包括光学补偿膜的液晶显示器, 其中所述光学补偿膜包括;
设置在液晶面板一侧的第一 C膜, 置于所述第一 C膜外侧的第一偏光片, 以及设置在所述液晶面板另一侧的第二 C膜, 置于所述第二 C膜外侧的 A膜以 及置干所述 A膜外侧的第二偏光片, 其中
所述 A膜的面內光程差补偿值 RoA 的范围为: 92iim≤RoA ^184^ 1, 所述 A膜的厚度方向上光程差补偿值 RthA 5i的范围为: 46nm≤RthA «^9211111, 所述第一 C膜和第二 C膜的厚度方^上光程差补偿值 Rthc 的范围均为: Yiiim≤RthC i≤Y2nm, 而 Y〗=- 0,00(U325x3+0.0636x2— 6。9467x+302,28 ,
Y2=-0.00003945x4+0.010772x3-l .1044x2+50.3833x-725.5, 其中 x为 A膜的厚度方向 上光程差补偿值 RthAJ¾。
14. 根据权利要求 13所述的显示器,其中,所述第一C膜的慢轴与所述第一 偏光; t的吸收轴垂直,所述 A膜和所述第二 C膜的慢轴与所述第二偏光片的吸收 轴垂直。
15. 根据权利要求 13 所述的显示器, 其中, 所述液晶面板的液晶光程差 LCANd 的范围为: 305.8nm<LCANd<324.3nm, 所述液晶面板的液晶预倾角的范 围为: 85°≤预倾角≤89°。
16. 根据权利要求 3所述的显示器, 其中, 根据公式
Rth - [(.Λ¾ + Ny) / 2— Λ¾] *
通过改变所述 Α膜的折射率和 /或厚度来控制所述 A膜的面内光程差补偿值 RoA 5^n A膜的厚度方向上光程差补偿值 RthA fl(,通过改变所述第一 C膜和第二 C 膜的折射率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方向上光程 差补偿值 RthC 3i, 其中 Nx和 Ny为相应的膜在面内方向上的折射率, X与 y方向 相互正交, Nz为相应的膜在厚度方向上的折射率, d为相应的膜的厚度, Ro 和 Rth分别为相应的膜的面内光程差延迟值和厚度方^上光程差延迟值。
17. 根据权利要求 14所述的显示器, 其中, 根据公式
Ro = (Nx ~ Ny * d
R h - [(Nx + Ny) 12 - Nz] * d ,
通过改变所述 A膜的折射率和 /或厚度来控制所述 A膜的面内光程差 偿值 R.oA SI和 A膜的厚度方向上光程差补偿值 RihA J¾,通过改变所述第一 C膜和第二 C 膜的折射率和 /或厚度来相应地控制所述第一 C膜和第二 C膜的厚度方向上光程 差补偿值 RthC 3(, 其中 1¾和 Ny为相应的膜在面內方向上的折射率, X与 y方向
相互正交, N2为相应的膜在厚度方向上的折射率, d 为相应的膜的厚度, Ro 和
Rth分别为相应的膜的面内光程差延迟值和厚度方^上光程差延迟值。
18. 根据权利要求】5所述的显示器, 其中, 根据公式
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CN105278151A (zh) * | 2015-11-11 | 2016-01-27 | 深圳市华星光电技术有限公司 | 液晶面板 |
CN105334672A (zh) * | 2015-12-08 | 2016-02-17 | 深圳市华星光电技术有限公司 | 液晶面板补偿架构及其光学补偿方法 |
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