WO2016070450A1 - 液晶面板补偿架构及液晶显示装置 - Google Patents

液晶面板补偿架构及液晶显示装置 Download PDF

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WO2016070450A1
WO2016070450A1 PCT/CN2014/090951 CN2014090951W WO2016070450A1 WO 2016070450 A1 WO2016070450 A1 WO 2016070450A1 CN 2014090951 W CN2014090951 W CN 2014090951W WO 2016070450 A1 WO2016070450 A1 WO 2016070450A1
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liquid crystal
compensation
crystal panel
film
rth1
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PCT/CN2014/090951
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English (en)
French (fr)
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海博
康志聪
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深圳市华星光电技术有限公司
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Priority to US14/426,739 priority Critical patent/US9535287B2/en
Publication of WO2016070450A1 publication Critical patent/WO2016070450A1/zh

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    • 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
    • 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
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
    • 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
    • G02F1/133635—Multifunctional compensators
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • 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
    • G02F2413/02—Number of plates being 2
    • 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
    • G02F2413/05—Single plate on one side of the LC cell
    • 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
    • G02F2413/08—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 with a particular optical axis orientation
    • 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
    • G02F2413/12—Biaxial compensators

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a liquid crystal panel compensation architecture and a liquid crystal display device.
  • LCD Liquid Crystal Display
  • TFT Thin Film Transistor
  • the linear liquid crystal for producing a liquid crystal display panel is a substance having a birefringence ⁇ n.
  • the light When the light passes through the liquid crystal molecules, it can be divided into two directions: ordinary ray and extraordinary ray, if the light is obliquely incident.
  • the liquid crystal molecules produce two refracted rays.
  • the light characteristics of the liquid crystal cell are usually measured by the phase delay ⁇ n ⁇ d, also known as the optical path difference, ⁇ n is the birefringence, d is the thickness of the liquid crystal cell, and the difference in phase retardation at different viewing angles of the liquid crystal cell is the problem of viewing angle. origin.
  • the phase retardation of a good optical compensation film can cancel out the phase retardation of the linear liquid crystal, and the viewing angle of the liquid crystal panel can be widened.
  • the compensation principle of the optical compensation film is generally to correct the phase difference generated by the liquid crystal at different viewing angles, so that the birefringence properties of the liquid crystal molecules are compensated for symmetry. Compensation by optical 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 film can be divided into a phase difference film, a color difference compensation film, and a viewing angle expansion film which are simply changed in phase.
  • the use of an optical compensation film can reduce the amount of light leakage in the dark state of the liquid crystal display, and can greatly improve the contrast, chromaticity and overcome some gray scale inversion problems in a certain viewing angle.
  • the main parameters for measuring the characteristics of the optical compensation film include the in-plane compensation value Ro in the plane direction, the thickness compensation value Rth in the thickness direction, the refractive index N, and the film thickness D, which satisfy the following relationship:
  • Rth [(Nx+Ny)/2-Nz] ⁇ D
  • Nx is the refractive index along the slow axis (the axis with the largest refractive index, that is, the direction of vibration where the light has a slower propagation velocity) in the plane of the film
  • Ny is the fast axis along the plane of the film (with the smallest refractive index)
  • Nz is the refractive index in the plane of the film (perpendicular to Nx and Ny).
  • the optical compensation film used is different for different liquid crystal display modes, that is, different liquid crystal cell types, and the Ro and Rth values are also adjusted to appropriate values. Most of the optical compensation films used in the large-size LCD TVs are for the VA (Vertical Alignment) display mode.
  • the early use of Konica (Konica) N-TAC has been developed to form the OPTES company. Zeonor, Fujitsu's F-TAC series, Nitto Denko's X-plate, etc.
  • FIG. 1 is a dark state full-view brightness contour distribution diagram of the liquid crystal panel compensated by a conventional compensation architecture
  • 2 is a contrast contour distribution map of a full-view angle of the liquid crystal panel compensated by the double-layer dual-axis compensation architecture.
  • the present invention provides a liquid crystal panel compensation architecture.
  • a liquid crystal panel having an optical path difference of 342.8 to 361.4 nm the dark state light leakage problem of the liquid crystal panel can be effectively reduced by setting a compensation value. , increase the contrast and sharpness of large viewing angles.
  • a liquid crystal panel compensation structure comprising two second compensation films respectively disposed on two sides of the liquid crystal panel, wherein a second compensation film is further provided with a first compensation film;
  • the liquid crystal panel is provided with a plurality of a liquid crystal layer of liquid crystal molecules, wherein the refractive index anisotropy of the liquid crystal layer is ⁇ n, the thickness is d, and the pretilt angle of the liquid crystal molecules is ⁇ ;
  • the first compensation film is a biaxial compensation film, and the in-plane compensation value is Ro1
  • the thickness compensation value is Rth1;
  • the second compensation film is a uniaxial compensation film, and the thickness compensation value is Rth2, wherein:
  • the first compensation film is further provided with a first polarizing film and a first protective film in a direction away from the liquid crystal panel; and the other second compensation film is further provided with a second polarizing film and a second Protective film.
  • the materials of the first polarizing film and the second polarizing film are both polyvinyl alcohol.
  • the materials of the first protective film and the second protective film are all cellulose triacetate.
  • the angle between the absorption axis of the first polarizing film and the slow axis of the first compensation film is 90°; the angle between the absorption axis of the second polarizing film and the slow axis of the other second compensation film It is 90°.
  • a first adhesive layer is further disposed between the liquid crystal panel and a second compensation film; and a second adhesive layer is further disposed between the liquid crystal panel and the other second compensation film.
  • the materials of the first adhesive layer and the second adhesive layer are all pressure sensitive adhesives.
  • the liquid crystal panel is a liquid crystal panel in a vertical alignment mode.
  • a liquid crystal display device including a liquid crystal panel and a backlight module, wherein the liquid crystal panel is disposed opposite to the backlight module, and the backlight module provides a display light source to the liquid a crystal panel for causing the liquid crystal panel to display an image, wherein the liquid crystal panel adopts a liquid crystal panel of a compensation structure as described above.
  • a compensation structure including a two-axis compensation film and two single-layer compensation films is provided, and compensation is provided by setting The compensation value of the film can effectively reduce the dark state light leakage problem of the liquid crystal panel, increase the contrast and sharpness of the large viewing angle, and improve the visual range of the large viewing angle.
  • FIG. 1 is a view showing a brightness profile of a dark state full-view angle of a conventional liquid crystal panel.
  • FIG. 2 is a view showing a contour view of a full-view angle of the liquid crystal panel shown in FIG. 1.
  • FIG. 3 is an exemplary illustration of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 4 is an exemplary illustration of a liquid crystal panel provided by an embodiment of the present invention.
  • FIG. 5 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 342.8 nm according to an embodiment of the present invention.
  • FIG. 6 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 352.1 nm according to an embodiment of the present invention.
  • FIG. 7 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 361.4 nm according to an embodiment of the present invention.
  • FIG. 8 is a brightness profile view of a dark state full view angle of a compensated liquid crystal panel in a specific embodiment.
  • Fig. 9 is a view showing a contour distribution of a full viewing angle and the like of the liquid crystal panel shown in Fig. 8.
  • FIG. 10 is a brightness profile view of a dark state full-view angle of the compensated liquid crystal panel in another embodiment.
  • Fig. 11 is a view showing a contour distribution of a full-view angle and the like of the liquid crystal panel shown in Fig. 10.
  • FIG. 12 is a view showing a brightness state distribution of a dark state full-view angle of a liquid crystal panel after compensation in another embodiment.
  • Fig. 13 is a view showing a contour distribution of a full viewing angle and the like of the liquid crystal panel shown in Fig. 12.
  • the liquid crystal display device of the present embodiment includes a liquid crystal panel 100 and a backlight module 200.
  • the liquid crystal panel 100 is disposed opposite to the backlight module 200, and the backlight module 200 provides a display light source.
  • the liquid crystal panel 100 is configured to display an image on the liquid crystal panel 100, wherein the liquid crystal panel 100 is a liquid crystal panel compensated by a compensation structure having one biaxial compensation film and two single layer compensation films.
  • the liquid crystal panel compensation structure is as shown in FIG. 4 , and the liquid crystal panel compensation structure includes two second compensation films 12 a and 12 b respectively disposed on two sides of the liquid crystal panel 10 , and one of the second compensation films 12 a is further A first compensation film 11 is provided. Further, in the direction away from the liquid crystal panel 10, the first compensation film 11 is sequentially provided with a first polarizing film 13 and a first protective film 15, and the other second compensation film 12b is further provided with a second polarizing film 14 in this order. And a second protective film 16. A first adhesive layer 17 is further disposed between the liquid crystal panel 10 and one of the second compensation films 12a; and a second adhesive layer 18 is further disposed between the liquid crystal panel 10 and the other second compensation film 12b.
  • the liquid crystal panel 10 is a Vertical Alignment Cell (VA Cell); the first polarizing film 13 and the second polarizing film 14 are made of polyvinyl alcohol (PVA), and the first polarizing film 13 is used.
  • the angle between the light absorption axis and the slow axis of the first compensation film 11 is set to 90°, and the angle between the light absorption axis of the second polarizing film 14 and the slow axis of the second compensation film 12b is set to 90°; the first protective film 15
  • the material of the second protective film 16 is triacetyl cellulose (TAC), and the TAC protective films 15, 16 are mainly used to protect the PVA polarizing films 13, 14 to lift the PVA polarizing film 13, 14.
  • TAC triacetyl cellulose
  • the liquid crystal panel 10 is provided with a liquid crystal layer including a plurality of liquid crystal molecules having a refractive index anisotropy of ⁇ n, a thickness d, and a liquid crystal molecule having a pretilt angle of ⁇ .
  • the first compensation film 11 is a biaxial compensation film
  • the in-plane compensation value is represented by Ro1
  • the thickness compensation value is represented by Rth1
  • the two second compensation films 12a and 12b are uniaxial compensation films.
  • the thickness compensation value is represented by Rth2.
  • the purpose is to effectively reduce the liquid crystal by appropriately setting the compensation values of the first compensation film 11 and the second compensation films 12a, 12b for the liquid crystal panel having an optical path difference of 342.8 to 361.4 nm.
  • the dark state of the panel leaks light, increasing the contrast and sharpness of the large viewing angle.
  • the pretilt angle ⁇ is 85° ⁇ ⁇ ⁇ 90°;
  • the four quadrant liquid crystal tilt angles are 45°, 135°, 225° and 315°, respectively;
  • the optical path difference ⁇ n ⁇ d is 342.8 nm ⁇ ⁇ n ⁇ d ⁇ 361.4 nm.
  • Light source blue-yttrium aluminum garnet light emitting diode (Blue-YAG LED) spectrum
  • the central brightness of the light source is defined as 100 nits (nit);
  • the light source distribution is Lambert's distribution.
  • FIG. 5 is a graph showing a trend of a dark state light leakage with a compensation value when the liquid crystal optical path difference is 342.8 nm and the pretilt angle ⁇ is 89° in the liquid crystal display device of the embodiment;
  • FIG. The liquid crystal display device has a trend of changing the dark state light leakage with the compensation value when the liquid crystal optical path difference is 352 nm and the pretilt angle ⁇ is 89°;
  • FIG. 7 is a liquid crystal display device of the present embodiment having a liquid crystal optical path difference of 361.4 nm and a pretilt angle.
  • the trend of the dark state light leakage with the compensation value when ⁇ is 89°; wherein, in the embodiment of the invention, the compensation values of the two second compensation films 12a, 12b are the same. Therefore, in the same way, with different pre-tilt angles and different compensation values for simulation, it can be obtained in the range of 342.8nm ⁇ ⁇ n ⁇ d ⁇ 361.4nm, 85 ° ⁇ ⁇ ⁇ 90 °, dark state light leakage is less than 0.2
  • the corresponding compensation values of the first compensation film 11 and the second compensation films 12a, 12b are respectively: 52 nm ⁇ Ro1 ⁇ 78 nm; 196 nm ⁇ Rth1 ⁇ 293 nm; Y1 nm ⁇ Rth2 ⁇ Y2 nm;
  • Rth [(Nx+Ny)/2-Nz] ⁇ D
  • the compensation value can be changed in the following three ways:
  • the thickness D is changed to change the compensation value
  • the refractive index N is changed to change the compensation value
  • the thickness D and the refractive index N are simultaneously changed to change the compensation value.
  • FIG. 8 is a dark state full-view and other brightness contour distribution diagram of the liquid crystal panel after compensation in a specific embodiment
  • FIG. 9 is a full-view equal-contrast contour of the compensated liquid crystal panel in the specific embodiment. Distribution.
  • the maximum dark state light leakage value measured was 0.17 nit. Comparing FIG. 8 with FIG.
  • FIG. 10 is a dark state full-view and other brightness contour distribution diagram of the compensated liquid crystal panel in an embodiment
  • FIG. 11 is a full-view equal-contrast contour of the compensated liquid crystal panel in the embodiment. Distribution.
  • the maximum dark state light leakage value measured was 0.137 nit. Comparing FIG. 10 with FIG.
  • FIG. 12 is a dark state full-view and other brightness contour distribution diagram of the compensated liquid crystal panel in a specific embodiment
  • FIG. 13 is a full-view equal-contrast contour of the compensated liquid crystal panel in the embodiment. Distribution.
  • the maximum dark state light leakage value measured is 0.1 nit. Comparing FIG. 12 with FIG.
  • a compensation structure including a two-axis compensation film and two single-layer compensation films, and setting a compensation value of the corresponding compensation film, Effectively reduce the dark light leakage problem of the liquid crystal panel, increase the contrast and sharpness of the large viewing angle, and improve the visual range of the large viewing angle.

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

Abstract

一种液晶面板（10）补偿架构，包括分别设置于液晶面板（10）两侧的两个第二补偿膜（12a，12b），其中的一个第二补偿膜（12a）上还设置有一第一补偿膜（11）；液晶面板（10）设置有包括多个液晶分子的液晶层，液晶层的折射率各向异性为Δn，厚度为d，液晶分子的预倾角为θ；第一补偿膜（11）为双轴补偿膜，其面内补偿值为Ro1，厚度补偿值为Rth1；第二补偿膜（12a，12b）为单轴补偿膜，其厚度补偿值为Rth2，其中：342.8nm≤Δn×d≤361.4nm；85°≤θ＜90°；52nm≤Ro1≤78nm；196nm≤Rth1≤293nm；Y1nm≤Rth2≤Y2nm；Y1＝-0.50645×Rth1+164.1；Y2＝-0.003085×(Rth1) 2+0.932×Rth1+23.7。还提供了包含该补偿架构的液晶显示装置。

Description

液晶面板补偿架构及液晶显示装置 技术领域
本发明涉及液晶显示技术领域,尤其涉及一种液晶面板补偿架构以及液晶显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)，为平面超薄的显示设备，它由一定数量的彩色或黑白像素组成，放置于光源或者反射面前方。液晶显示器功耗很低，并且具有高画质、体积小、重量轻的特点，因此倍受大家青睐，成为显示器的主流。目前液晶显示器是以薄膜晶体管(Thin Film Transistor，TFT)液晶显示器为主。
随着TFT-LCD的面积越来越大，其观察角度不断增大，画面的对比度不断降低，画面的清晰度下降，这是液晶层中液晶分子的双折射率随观察角度变化发生改变的结果。对于普通的液晶显示屏来说，当从某个角度观看普通的液晶显示屏时，将发现它的亮度急遽的损失(变暗)及变色。传统的液晶显示器通常只有90度的视角，也就是左/右两边各45度。制作液晶显示面板的线状液晶是一种具有双折射率Δn的物质，当光线通过液晶分子后，可分成寻常光线(ordinary ray)与非常光线(extraordinary ray)两道光，如果光线是斜向入射液晶分子，便会产生两道折射光线，光线的双折射率Δn＝ne-no，ne表示液晶分子对寻常光线的折射率，no表示液晶分子对非常光线的折射率。因此当光线经过上下两片玻璃所夹住的液晶后，光线就会产生相位延迟(phase retardation)的现象。液晶盒的光线特性通常用相位延迟Δn×d来衡量，也称为光程差，Δn为双折射率，d为液晶盒的厚度，液晶盒不同视角下相位延迟的不同是其产生视角问题的由来。良好的光学补偿膜的相位延迟可以跟线状液晶的相位延迟互相抵消，就可以增广液晶面板的可视角度。
光学补偿膜的补偿原理一般是将液晶在不同视角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。采用光学补偿膜进行补偿，可以有效降低暗态画面的漏光，在一定视角内能大幅度提高画面的对比度。光学补 偿膜从其功能目的来区分则可分为单纯改变相位的位相差膜、色差补偿膜及视角扩大膜等。使用光学补偿膜能降低液晶显示器暗态时的漏光量，并且在一定视角内能大幅提高影像之对比、色度与克服部分灰阶反转问题。衡量光学补偿膜特性的主要参数包括在平面方向上的面内补偿值Ro，在厚度方向上的厚度补偿值Rth，折射率N，以及膜厚度D，满足如下关系式：
Ro＝(Nx-Ny)×D；
Rth＝[(Nx+Ny)/2-Nz]×D；
其中，Nx是膜平面内沿着慢轴(具有最大折射率的轴，也就是光线具有较慢传播速率的振动方向)的折射率，Ny是膜平面内沿着快轴(具有最小折射率的轴，也就是光波具有较快传播速率的振动方向，垂直于Nx)的折射率，Nz是膜平面方向的折射率(垂直于Nx和Ny)。
针对不同的液晶显示模式，也即不同的液晶盒类型，使用的光学补偿膜也不同，而且Ro和Rth值也需调节为合适的值。现有大尺寸液晶电视使用的光学补偿膜大多是针对VA(垂直配向)显示模式，早期使用的有Konica(柯尼卡)公司的N-TAC，后来不断发展形成OPTES(奥普士)公司的Zeonor，富士通的F-TAC系列，日东电工的X-plate等。
针对不同的液晶光程差的越大，需要设计不同的光学补偿模式。对于光程差为342.8～361.4nm范围内的液晶面板，参阅图1和图2，图1是经现有的一种补偿架构补偿后的液晶面板的暗态全视角等亮度轮廓分布图；图2是前述双层双轴补偿架构补偿后的液晶面板的全视角等对比度轮廓分布图。从图1和2可以看出，采用现行的补偿架构进行补偿，在水平视角phi＝20～40°、phi＝140～160°、phi＝200～220°以及phi＝310～330°的位置漏光严重，暗态漏光严重的视角更接近水平视角，并且这些视角的对比度和清晰度偏低，而一般观众与TV的相对位置决定了接近水平视角的区域更容易被观众看到，所以这些视角的对比度和清晰度对观看效果的影响最大。
发明内容
鉴于现有技术存在的不足，本发明提供了一种液晶面板补偿架构，针对光程差为342.8～361.4nm范围内的液晶面板，通过设置补偿值，能够有效地降低液晶面板的暗态漏光问题，增加大视角的对比度和清晰度。
为了实现上述目的，本发明采用了如下的技术方案：
一种液晶面板补偿架构，其中，包括分别设置于液晶面板两侧的两个第二补偿膜，其中的一个第二补偿膜上还设置有一第一补偿膜；所述液晶面板设置有包括多个液晶分子的液晶层，所述液晶层的折射率各向异性为Δn，厚度为d，液晶分子的预倾角为θ；所述第一补偿膜为双轴补偿膜，其面内补偿值为Ro1，厚度补偿值为Rth1；所述第二补偿膜为单轴补偿膜，其厚度补偿值为Rth2，其中：
342.8nm≤Δn×d≤361.4nm；
85°≤θ＜90°；
52nm≤Ro1≤78nm；
196nm≤Rth1≤293nm；
Y1nm≤Rth2≤Y2nm；
Y1＝-0.50645×Rth1+164.1；
Y2＝-0.003085×(Rth1)2+0.932×Rth1+23.7。
其中，58nm≤Ro1≤68nm，220nm≤Rth1≤257nm，67nm≤Rth2≤103nm。
其中，按照远离所述液晶面板的方向，所述第一补偿膜上还依次设置有第一偏光膜和第一保护膜；另一第二补偿膜上还依次设置有第二偏光膜和第二保护膜。
其中，所述第一偏光膜和第二偏光膜的材料均为聚乙烯醇。
其中，所述第一保护膜和第二保护膜的材料均为三醋酸纤维素。
其中，所述第一偏光膜的吸光轴与所述第一补偿膜的慢轴的夹角为90°；所述第二偏光膜的吸光轴与另一第二补偿膜的慢轴的夹角为90°。
其中，所述液晶面板与一个第二补偿膜之间还设置有第一粘合层；所述液晶面板与另一第二补偿膜之间还设置有第二粘合层。
其中，所述第一粘合层和第二粘合层的材料均为压敏胶粘剂。
其中，所述液晶面板为垂直配向模式的液晶面板。
本发明的另一方面是提供一种液晶显示装置，包括液晶面板及背光模组，所述液晶面板与所述背光模组相对设置，所述背光模组提供显示光源给所述液 晶面板，以使所述液晶面板显示影像，其中，所述液晶面板采用如上所述的补偿架构的液晶面板。
相比于现有技术，本发明中，针对光程差为342.8～361.4nm范围内的液晶面板，提供了一种包括一个双轴补偿膜和两个单层补偿膜的补偿架构，通过设置补偿膜的补偿值，能够有效地降低液晶面板的暗态漏光问题，增加大视角的对比度和清晰度，提升大视角的可视范围度。
附图说明
图1是现有的一种液晶面板的暗态全视角等亮度轮廓分布图。
图2是如图1所示的液晶面板的全视角等对比度轮廓分布图。
图3是本发明实施例提供的液晶显示装置的示例性图示。
图4是本发明实施例提供的液晶面板的示例性图示。
图5是本发明实施例提供的液晶显示装置在液晶光程差为342.8nm时的暗态漏光随补偿值变化趋势图。
图6是本发明实施例提供的液晶显示装置在液晶光程差为352.1nm时的暗态漏光随补偿值变化趋势图。
图7是本发明实施例提供的液晶显示装置在液晶光程差为361.4nm时的暗态漏光随补偿值变化趋势图。
图8是一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图。
图9是如图8所示的液晶面板的全视角等对比度轮廓分布图。
图10是另一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图。
图11是如图10所示的液晶面板的全视角等对比度轮廓分布图。
图12是另一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图。
图13是如图12所示的液晶面板的全视角等对比度轮廓分布图。
具体实施方式
为了使本发明的目的、技术方案以及优点更加清楚明白，下面将结合附图用实施例对本发明做进一步说明。
如图3所示，本实施例提供的液晶显示装置，包括液晶面板100及背光模组200，所述液晶面板100与所述背光模组200相对设置，所述背光模组200提供显示光源给所述液晶面板100，以使所述液晶面板100显示影像，其中，所述液晶面板100为采用了具有一个双轴补偿膜和两个单层补偿膜的补偿架构进行补偿的液晶面板。
具体地，上述的液晶面板补偿架构如图4所示，该液晶面板补偿架构包括分别设置于液晶面板10两侧的两个第二补偿膜12a、12b，其中的一个第二补偿膜12a上还设置有一第一补偿膜11。进一步地，按照远离液晶面板10的方向，第一补偿膜11上还依次设置有第一偏光膜13和第一保护膜15，另一第二补偿膜12b上还依次设置有第二偏光膜14和第二保护膜16。液晶面板10与其中的一个第二补偿膜12a之间还设置有第一粘合层17；液晶面板10与另一第二补偿膜12b之间还设置有第二粘合层18。
其中，液晶面板10为垂直配向模式的液晶盒(Vertical Alignment Cell，VA Cell)；第一偏光膜13和第二偏光膜14的材料为聚乙烯醇(Polyvinyl alcohol，PVA),第一偏光膜13的吸光轴与第一补偿膜11的慢轴的夹角设置为90°，第二偏光膜14的吸光轴与第二补偿膜12b的慢轴的夹角设置为90°；第一保护膜15和第二保护膜16的材料均为三醋酸纤维素(Triacetyl Cellulose，TAC)，TAC保护膜15、16的主要是用于保护PVA偏光膜13、14，以提升PVA偏光膜13、14的机械性能，防止PVA偏光膜13、14回缩，第一粘合层17和第二粘合层18的材料均为压敏胶粘剂(pressure sensitive adhesive，PSA)。
液晶面板10设置有包括多个液晶分子的液晶层，液晶层的折射率各向异性为Δn，厚度为d，液晶分子的预倾角(Pritilt angle)为θ。在以上的补偿架构中，第一补偿膜11为双轴补偿膜，其面内补偿值采用Ro1表示，厚度补偿值采用Rth1表示，两个第二补偿膜12a、12b均为单轴补偿膜，其厚度补偿值采用Rth2表示。
在以上的架构中，其目的是针对光程差为342.8～361.4nm范围内的液晶面板，通过合理的设置第一补偿膜11和第二补偿膜12a、12b的补偿值，达到有效地降低液晶面板的暗态漏光问题，增加大视角的对比度和清晰度的目的。
在模拟的过程中，进行了如下设定：
一、液晶层设定：
1、预倾角θ为85°≤θ＜90°；
2、四个象限液晶倾角分别为45°、135°、225°以及315°；
3、光程差Δn×d为342.8nm≤Δn×d≤361.4nm。
二、背光源设定：
1、光源：蓝光–钇铝石榴石发光二极管(Blue-YAG LED)光谱；
2、光源中央亮度定义为100尼特(nit)；
3、光源分布为朗伯分布(Lambert’s distribution)。
参阅图5-7，图5是本实施例的液晶显示装置在液晶光程差为342.8nm，预倾角θ为89°时的暗态漏光随补偿值变化趋势图；图6是本实施例的液晶显示装置在液晶光程差为352nm，预倾角θ为89°时的暗态漏光随补偿值变化趋势图；图7是本实施例的液晶显示装置在液晶光程差为361.4nm，预倾角θ为89°时的暗态漏光随补偿值变化趋势图；其中，在本发明的实施例中，两个第二补偿膜12a、12b的补偿值取值是一样的。因此，按照相同的方式，在不同的预倾角下搭配不同的补偿值进行模拟，可获得在342.8nm≤Δn×d≤361.4nm，85°≤θ＜90°的范围内，暗态漏光小于0.2nit时，第一补偿膜11和第二补偿膜12a、12b的对应补偿值的范围分别为：52nm≤Ro1≤78nm；196nm≤Rth1≤293nm；Y1nm≤Rth2≤Y2nm；其中：
Y1＝-0.50645×Rth1+164.1；
Y2＝-0.003085×(Rth1)2+0.932×Rth1+23.7。
由于补偿膜的补偿值Ro、Rth，折射率N以及厚度D具有如下关系：
Ro＝(Nx-Ny)×D；
Rth＝[(Nx+Ny)/2-Nz]×D；
对于单轴补偿膜，Nx＝Ny，即Ro＝0。
因此可以通过以下三种方法来改变补偿值：
1、在补偿膜的折射率N不变的基础上，改变厚度D来改变补偿值；
2、在补偿膜的厚度D不变的基础上，改变折射率N来改变补偿值；
3、在保证补偿膜的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。
下面选择一些具体的补偿值并测试相应的补偿结果，进一步具体说明本发明的技术方案所取得的技术效果。
参阅图8和图9，图8是一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图，图9是该具体实施例中补偿后的液晶面板的全视角等对比度轮廓分布图。图8和图9的设定条件为：光程差Δn×d＝342.8nm，预倾角θ＝89°，Ro1＝58nm，Rth1＝220nm，Rth2＝67nm。测量到的最大暗态漏光值为0.17nit。对比图8与图1，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其暗态漏光远远低于现有的液晶面板的暗态漏光。对比图9与图2，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其全视角对比度分布也优于现有液晶面板的全视角对比度分布。
参阅图10和图11，图10是一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图，图11是本具体实施例中补偿后的液晶面板的全视角等对比度轮廓分布图。图10和图11的设定条件为：光程差Δn×d＝352.1nm，预倾角θ＝89°，Ro1＝65nm，Rth1＝244nm，Rth2＝56nm。测量到的最大暗态漏光值为0.137nit。对比图10与图1，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其暗态漏光远远低于现有的液晶面板的暗态漏光。对比图11与图2，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其全视角对比度分布也优于现有的液晶面板的全视角对比度分布。
参阅图12和图13，图12是一具体实施例中补偿后的液晶面板的暗态全视角等亮度轮廓分布图，图13是本具体实施例中补偿后的液晶面板的全视角等对比度轮廓分布图。图12和图13的设定条件为：光程差Δn×d＝361.4nm，预倾角θ＝89°，Ro1＝68nm，Rth1＝257nm，Rth2＝103nm。测量到的最大暗态漏光值为0.1nit。对比图12与图1，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其暗态漏光远远低于现有的液晶面板的暗态漏光。对比图13与图2，可以直接观察到，经本实施例的补偿架构补偿后的液晶面板，其全视角对比度分布也优于现有的液晶面板的全视角对比度分布。
以上的3个具体的实施例中，其中的光程差Δn×d、预倾角θ以、Ro1、Rth1、Ro2以及Rth2的具体取值，仅仅是作为例子进行说明。经过实践证明，当这些参数的取值在以下范围内时，即：52nm≤Ro1≤78nm；196nm≤Rth1≤293nm；Y1nm≤Rth2≤Y2nm；Y1＝-0.50645×Rth1+164.1；Y2＝-0.003085×(Rth1)2+0.932×Rth1+23.7，都可以达到与上述具体例子相同或近似的技术效果。
综上所述，本发明中，针对较低光程差的液晶面板，通过提供一种包括一个双轴补偿膜和两个单层补偿膜的补偿架构，并设置相应补偿膜的补偿值，能够有效地降低液晶面板的暗态漏光问题，增加大视角的对比度和清晰度，提升大视角的可视范围度。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (18)

  1. 一种液晶面板补偿架构，其中，包括分别设置于液晶面板两侧的两个第二补偿膜，其中的一个第二补偿膜上还设置有一第一补偿膜；所述液晶面板设置有包括多个液晶分子的液晶层，所述液晶层的折射率各向异性为Δn，厚度为d，液晶分子的预倾角为θ；所述第一补偿膜为双轴补偿膜，其面内补偿值为Ro1，厚度补偿值为Rth1；所述第二补偿膜为单轴补偿膜，其厚度补偿值为Rth2，其中：
    342.8nm≤Δn×d≤361.4nm；
    85°≤θ＜90°；
    52nm≤Ro1≤78nm；
    196nm≤Rth1≤293nm；
    Y1nm≤Rth2≤Y2nm；
    Y1＝-0.50645×Rth1+164.1；
    Y2＝-0.003085×(Rth1)2+0.932×Rth1+23.7。
  2. 根据权利要求1所述的液晶面板补偿架构，其中，58nm≤Ro1≤68nm，220nm≤Rth1≤257nm，67nm≤Rth2≤103nm。
  3. 根据权利要求1所述的液晶面板补偿架构，其中，按照远离所述液晶面板的方向，所述第一补偿膜上还依次设置有第一偏光膜和第一保护膜；另一第二补偿膜上还依次设置有第二偏光膜和第二保护膜。
  4. 根据权利要求3所述的液晶面板补偿架构，其中，所述第一偏光膜和第二偏光膜的材料均为聚乙烯醇。
  5. 根据权利要求3所述的液晶面板补偿架构，其中，所述第一保护膜和第二保护膜的材料均为三醋酸纤维素。
  6. 根据权利要求3所述的液晶面板补偿架构，其中，所述第一偏光膜的吸光轴与所述第一补偿膜的慢轴的夹角为90°；所述第二偏光膜的吸光轴与另一第二补偿膜的慢轴的夹角为90°。
  7. 根据权利要求1所述的液晶面板补偿架构，其中，所述液晶面板与一个第二补偿膜之间还设置有第一粘合层；所述液晶面板与另一第二补偿膜之间还设置有第二粘合层。
  8. 根据权利要求7所述的液晶面板补偿架构，其中，所述第一粘合层和第二粘合层的材料均为压敏胶粘剂。
  9. 根据权利要求1所述的液晶面板补偿架构，其中，所述液晶面板为垂直配向模式的液晶面板。
  10. 一种液晶显示装置，包括液晶面板及背光模组，所述液晶面板与所述背光模组相对设置，所述背光模组提供显示光源给所述液晶面板，以使所述液晶面板显示影像，其中，所述液晶面板设置有补偿架构，该架构包括分别设置于液晶面板两侧的两个第二补偿膜，其中的一个第二补偿膜上还设置有一第一补偿膜；所述液晶面板设置有包括多个液晶分子的液晶层，所述液晶层的折射率各向异性为Δn，厚度为d，液晶分子的预倾角为θ；所述第一补偿膜为双轴补偿膜，其面内补偿值为Ro1，厚度补偿值为Rth1；所述第二补偿膜为单轴补偿膜，其厚度补偿值为Rth2，其中：
    342.8nm≤Δn×d≤361.4nm；
    85°≤θ＜90°；
    52nm≤Ro1≤78nm；
    196nm≤Rth1≤293nm；
    Y1nm≤Rth2≤Y2nm；
    Y1＝-0.50645×Rth1+164.1；
    Y2＝-0.003085×(Rth1)2+0.932×Rth1+23.7。
  11. 根据权利要求10所述的液晶显示装置，其中，58nm≤Ro1≤68nm，220nm≤Rth1≤257nm，67nm≤Rth2≤103nm。
  12. 根据权利要求10所述的液晶显示装置，其中，按照远离所述液晶面板的方向，所述第一补偿膜上还依次设置有第一偏光膜和第一保护膜；另一第二补偿膜上还依次设置有第二偏光膜和第二保护膜。
  13. 根据权利要求12所述的液晶显示装置，其中，所述第一偏光膜和第二 偏光膜的材料均为聚乙烯醇。
  14. 根据权利要求12所述的液晶显示装置，其中，所述第一保护膜和第二保护膜的材料均为三醋酸纤维素。
  15. 根据权利要求12所述的液晶显示装置，其中，所述第一偏光膜的吸光轴与所述第一补偿膜的慢轴的夹角为90°；所述第二偏光膜的吸光轴与另一第二补偿膜的慢轴的夹角为90°。
  16. 根据权利要求10所述的液晶显示装置，其中，所述液晶面板与一个第二补偿膜之间还设置有第一粘合层；所述液晶面板与另一第二补偿膜之间还设置有第二粘合层。
  17. 根据权利要求16所述的液晶显示装置，其中，所述第一粘合层和第二粘合层的材料均为压敏胶粘剂。
  18. 根据权利要求10所述的液晶显示装置，其中，所述液晶面板为垂直配向模式的液晶面板。
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