WO2015003371A1 - 液晶显示器及其光学补偿方法 - Google Patents

液晶显示器及其光学补偿方法 Download PDF

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Publication number
WO2015003371A1
WO2015003371A1 PCT/CN2013/079240 CN2013079240W WO2015003371A1 WO 2015003371 A1 WO2015003371 A1 WO 2015003371A1 CN 2013079240 W CN2013079240 W CN 2013079240W WO 2015003371 A1 WO2015003371 A1 WO 2015003371A1
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WIPO (PCT)
Prior art keywords
uniaxial
compensation
compensation film
liquid crystal
film
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Ceased
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PCT/CN2013/079240
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English (en)
French (fr)
Inventor
康志聪
海博
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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 JP2016524648A priority Critical patent/JP6266769B2/ja
Priority to KR1020157034422A priority patent/KR101824952B1/ko
Priority to US14/004,419 priority patent/US9188809B2/en
Priority to EA201690186A priority patent/EA030366B9/ru
Priority to GB1519264.4A priority patent/GB2530430B/en
Publication of WO2015003371A1 publication Critical patent/WO2015003371A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363Birefringent elements, e.g. for optical compensation
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363Birefringent elements, e.g. for optical compensation
    • G02F1/133631Birefringent elements, e.g. for optical compensation with a spatial distribution of the retardation value
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1337Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F2413/00Indexing 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
    • G02F2413/02Number of plates being 2
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F2413/00Indexing 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
    • G02F2413/13Positive birefingence
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F2413/00Indexing 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
    • G02F2413/14Negative birefingence

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a liquid crystal display and an optical compensation method thereof.
  • TFT-LCD thin film transistor
  • the compensation principle of the compensation film is generally 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 for large-size LCD TVs is mostly for Vertical Alignment (VA) display mode.
  • VA Vertical Alignment
  • Konica's N-TAC was used in the early days, and it has been developed. It forms the Zeonor of OPOTES, the F-TAC series of Fujitsu, and the X-Plate of Nitto Denko.
  • the compensation value of the compensation film is different, the dark state light leakage of the large viewing angle is different, and the contrast is also different. Referring to FIG. 1 and FIG. 2, FIG.
  • FIG. 1 is a prior art using an unaxial positive birefringence A-Plate and a negative hyperbolic biaxial C-compensation film (unaxial Negative birefringence C).
  • -Plate Schematic diagram of compensating for the brightness distribution of the dark state, such as the Isoluminance contour
  • FIG. 2 is a schematic diagram of the equal contrast ratio contour of the prior art using A-Plate and C-Plate compensation, wherein the above A -Plate and C-Plate compensation values are as follows:
  • the present invention constructs a liquid crystal display, wherein the liquid crystal display has a wavelength of 550 nm, and the liquid crystal display has a liquid crystal optical path difference LCAND range of 324.3 nm LCAND 342.8 nm at 550 nm, and the liquid crystal display includes:
  • liquid crystal layer disposed between the first substrate and the second substrate
  • a first polarizing film disposed on an outer side of the first substrate
  • a second polarizing film disposed on an outer side of the second substrate
  • the positive hyperbolic uniaxial A-compensation film and the negative hyperbolic uniaxial C-compensation film are disposed on the first substrate and the first polarizer Between the films or between the second substrate and the second polarizing film;
  • the in-plane optical path difference compensation value Ro of the positive hyperbolic uniaxial A-compensation film has a value range of 92 nm Ro 184 nm, and the out-of-plane optical path difference compensation value Rth ranges from 46 nm Rth to 92 nm ;
  • the compensation value Rth of the negative hyperbolic uniaxial C-compensation film ranges from Yl Rth Y2; wherein Yl and ⁇ 2 satisfy the following formula:
  • X is the out-of-plane optical path compensation value of the positive hyperbolic uniaxial ⁇ -compensation film
  • the liquid crystal display includes:
  • liquid crystal layer disposed between the first substrate and the second substrate
  • a first polarizing film disposed on an outer side of the first substrate
  • a second polarizing film disposed on an outer side of the second substrate
  • the positive hyperbolic uniaxial A-compensation film and the negative hyperbolic uniaxial C-compensation film are disposed on the first substrate and the first polarizer Between the films or between the second substrate and the second polarizing film;
  • the in-plane optical path difference compensation value Ro of the positive hyperbolic uniaxial A-compensation film has a value range of 92 nm Ro 184 nm, and the out-of-plane optical path difference compensation value Rth ranges from 46 nm Rth to 92 nm;
  • the compensation value Rth of the negative hyperbolic uniaxial C-compensation film ranges from Yl Rth Y2; where Yl and ⁇ 2 satisfy the following formula:
  • ⁇ 2 -0.00006472 ⁇ 4 +0.017705 ⁇ -1.8284 ⁇ 2 +84.4843 ⁇ -1181.17;
  • X is the out-of-plane optical path compensation value of the positive hyperbolic uniaxial ⁇ -compensation film
  • the present invention also constructs an optical compensation method for a liquid crystal display, the method comprising:
  • Rth is in the range of 46 nm Rth 92 nm ;
  • Adjusting the compensation value Rth of the negative hyperbolic uniaxial C-compensation film is in Yl Rth Y2; wherein Yl and ⁇ 2 satisfy the following formula:
  • X is the out-of-plane optical path difference compensation value Rth of the positive hyperbolic uniaxial ⁇ -compensation film; the positive double zigzag uniaxial A-compensation film and the negative hyperbolic uniaxial C-compensation film are disposed in the Between the first substrate of the liquid crystal display and the first polarizing film or between the second substrate and the second polarizing film.
  • the invention reduces the dark state light leakage phenomenon of the large viewing angle by changing the compensation value of the positive hyperbolic uniaxial A-compensation film and the negative hyperbolic uniaxial C-compensation film in the liquid crystal display, and the invention can effectively increase the large viewing angle ( Contrast and sharpness of non-horizontal, large azimuth angles.
  • FIG. 1 is a schematic diagram of brightness distributions in the prior art using compensation values of A-Plate and C-Plate to compensate for dark state light leakage;
  • FIG. 2 is a schematic diagram showing the same contrast distribution of the full viewing angle after compensation using the compensation values of A-Plate and C-Plate in the prior art;
  • FIG. 3 is a schematic structural view of a liquid crystal display according to a second preferred embodiment of the present invention
  • FIG. 4 is a schematic structural view of a liquid crystal display according to a second preferred embodiment of the present invention
  • 5 is a schematic structural view of a liquid crystal display according to a third preferred embodiment of the present invention
  • FIG. 6 is a schematic view showing the structure of a liquid crystal display according to a fourth preferred embodiment of the present invention
  • Figure 8 is a graph showing the variation of the light leakage with the delay value during the simulation of the liquid crystal display.
  • Figure 9 is a schematic diagram of the brightness distribution of the dark state light leakage after the compensation value of the embodiment of the present invention is used for the A-Plate and the C-Plate;
  • FIG. 10 is a schematic diagram showing the same contrast distribution of the full viewing angle after the A-Plate and the C-Plate use the compensation value according to an embodiment of the present invention
  • FIG. 11 is a schematic diagram showing brightness distributions of dark state light leakage after A-Plate and C-Plate use compensation values according to another embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing the same contrast distribution of the full-view angle after the A-Plate and the C-Plate use the compensation value according to another embodiment of the present invention.
  • FIG. 13 is a schematic diagram showing brightness distributions of dark state light leakage after A-Plate and C-Plate use compensation values according to still another embodiment of the present invention.
  • Fig. 14 is a view showing the same contrast distribution of the full-view angles after the A-Plate and the C-Plate use the compensation value according to still another embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a first preferred embodiment of a liquid crystal display according to an embodiment of the present invention.
  • the liquid crystal display of the embodiment of the present invention is preferably a vertical alignment (VA) liquid crystal display, wherein the liquid crystal display has a wavelength range of visible light (380 nm, 760 nm), preferably 550 nm, and the liquid crystal display is at 550 nm.
  • the liquid crystal path difference LCAND range is 324.3 nm LCA ND 342.8, that is, the interval [324.3 nm, 342.8 nm]; and the liquid crystal pretilt angle Pretilt angle is 85° Pretilt angle ⁇ 90°, that is, the interval [85°, 90°).
  • the liquid crystal display includes a first substrate 31, a second substrate 32, a liquid crystal layer 33, a first polarizing film 34, and a second polarizing film 35, and further includes a positive double zigzag The uniaxial A-compensation film 36 and a negative hyperbolic uniaxial C-compensation film 37.
  • the liquid crystal layer 33 is disposed between the first substrate 31 and the second substrate 32.
  • the first polarizing film 34 is disposed outside the first substrate 31, and the second polarizing film 35 is disposed on the The outer side of the second substrate 32.
  • the positive hyperbolic uniaxial A-compensation film 36 and a negative hyperbolic uniaxial C-compensation film 37 may be disposed on different sides of the liquid crystal layer, and disposed in the same
  • the first substrate 31 is interposed between the first polarizing film 34 or the second substrate 31 and the second polarizing film 35.
  • the positive hyperbolic uniaxial A-compensation film 36 is disposed between the first substrate 31 and the first polarizing film 34.
  • the negative hyperbolic uniaxial C-compensation film 37 is disposed between the second substrate 32 and the second polarizing film 35.
  • the positive hyperbolic uniaxial A-compensation film 36 is disposed between the second substrate 32 and the second polarizing film 35, and the negative double The meandering uniaxial C-compensation film 37 is disposed between the first substrate 3 1 and the first polarizing film 34.
  • the positive hyperbolic uniaxial A-compensation film 36 and the negative hyperbolic uniaxial C-compensation film 37 may be disposed on the same side of the liquid crystal layer, and disposed in the same
  • the first substrate 3 1 is interposed between the first polarizing film 34 or the second substrate 3 1 and the second polarizing film 35 .
  • the positive hyperbolic uniaxial A-compensation film 36 and the negative hyperbolic uniaxial C-compensation film 37 are attached and connected to each other. Between the first substrate 3 1 and the first polarizing film 34 .
  • the positive hyperbolic uniaxial A-compensation film 36 and the negative hyperbolic uniaxial C-compensation film 37 are attached and connected to each other. Between the second substrate 32 and the second polarizing film 35.
  • the absorption axis of the first polarizing film 34 is 0 degrees
  • the absorption axis of the second polarizing film 35 is 90 degrees.
  • the first polarizing light When the absorption axis of the film 34 is 90 degrees and the absorption axis of the second polarizing film 35 is 0 degree, it is only required to ensure the positive hyperbolic uniaxial A-compensation film 36 or the negative hyperbolic uniaxial C-compensation.
  • the slow axis of the film 37 may be perpendicular to the absorption axis of the polarizing film (the first polarizing film 34 or the second polarizing film 35) on the same side as the liquid crystal layer 33, and is suitable for use in the present invention.
  • the present invention simulates the dark state light leakage by setting different compensation values of the positive hyperbolic uniaxial A-compensation film 36 and the negative hyperbolic uniaxial C-compensation film 37, and obtains the corresponding dark light leakage according to the simulation result. The range of compensation values.
  • the positive hyperbolic uniaxial A-compensation film 36 and the slow axis of the negative hyperbolic uniaxial C-compensation film 37 and its corresponding polarizing film are first disposed.
  • the angle of the absorption axis is 90 °
  • the liquid crystal pretilt angle of the liquid crystal display is set to [85 ° , 90 ° );
  • the liquid crystal azimuth pretwist in the four quadrants is set to 45 °, and the liquid crystal optical path is set.
  • the difference LCA ND is set in the interval [324.3nm, 342.8nm] ; and the light source used for the simulation is the blue-YAG (Yttrium Aluminum Garnet) LED spectrum, the central brightness is defined as 100nit, and the light source distribution is the Lambert distribution.
  • the light source used for the simulation is the blue-YAG (Yttrium Aluminum Garnet) LED spectrum, the central brightness is defined as 100nit, and the light source distribution is the Lambert distribution.
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3 nm and the pretilt angle is 89 ° and 85 °
  • FIG. 7 shows that when the liquid crystal optical path difference LCA ND is 342.3
  • the A-Plate Ro in Figs. 7 and 8 represents the in-plane retardation Ro of the positive hyperbolic uniaxial A-compensation film 36
  • the A-Plate Rth represents the thickness direction retardation of the positive hyperbolic uniaxial A-compensation film 36.
  • Rth, C-Plate Rth represents the thickness direction of the negative hyperbolic uniaxial C-compensation film 37 Delay Rth.
  • the range of delay values for the axis C-compensation film 37 is as follows:
  • the in-plane optical path difference compensation value Ro of the positive hyperbolic uniaxial A-compensation film 36 at a wavelength of 550 nm is: 92 nm Ro 184 nm, and the out-of-plane optical path difference compensation value Rth ranges from: 46 nm Rth 92 nm ; the compensation value Rth of the negative hyperbolic uniaxial C-compensation film 37 ranges from Yl Rth Y2, where Yl and ⁇ 2 satisfy the following formulas (1) and (2):
  • Nx is the positive hyperbolic uniaxial A-compensation film 36 face
  • Ny is the refractive index in the Y direction orthogonal to the X direction in the plane of the positive hyperbolic uniaxial A-compensation film 36
  • Nz is the positive double
  • dl is the thickness of the positive hyperbolic uniaxial A-compensation film 36
  • Nx > Ny, Ny Nz.
  • the range of the compensation value Rth of the negative hyperbolic uniaxial C-compensation film is obtained by the following formula (5):
  • the thickness d2 of the negative hyperbolic uniaxial C-compensation film 37 is adjusted according to the formula (5).
  • the range of the compensation value Rth of the negative hyperbolic uniaxial C-compensation film 37 is adjusted to Yl Rth Y2.
  • the refractive index Mx My Mz of the negative hyperbolic uniaxial C-compensation film 37 is adjusted, according to the formula (5),
  • the range of the compensation value Rth of the negative hyperbolic uniaxial C-compensation film 37 is adjusted to Y1 Rth Y2.
  • the present invention also provides an optical compensation method using a liquid crystal display, wherein the method is directed to a VA liquid crystal display, and the liquid crystal display has a wavelength range of visible light (380 nm, 760 nm), preferably 550 nm, and the liquid crystal display is at a wavelength
  • the LCAND range of the liquid crystal path difference at 550 nm is [324.3 nm, 342.8 nm], and the liquid crystal pretilt angle range is [85 °, 90°).
  • the liquid crystal display comprises a positive hyperbolic uniaxial A-compensation film 36 and a negative hyperbolic uniaxial C-compensation film 37, the positive hyperbolic uniaxial A-compensation film 36 and a negative hyperbolic
  • the uniaxial C-compensation film 37 is disposed on the opposite sides of the liquid crystal layer 33 and disposed on the first substrate 31 and the first polarizing film 34 or the second substrate 32 and the second polarizing film 35
  • the positive hyperbolic uniaxial A-compensation film 36 and the negative hyperbolic uniaxial C-compensation film 37 may also be disposed on the same side of the liquid crystal layer 33, and
  • the first substrate 31 is disposed between the first polarizing film 34 or the second substrate 33 and the second polarizing film 35, as shown in FIG. 5 and FIG.
  • the range of the in-plane retardation compensation value Ro of the positive hyperbolic uniaxial A-compensation film 36 is adjusted to 92 nm Ro 184 nm.
  • X is the positive buckling single-axis ⁇ -compensation film 36 out-of-plane optical path difference compensation value Rth.
  • the above steps (I), (II) and (III) are not in any order.
  • the in-plane optical path compensation value Ro of the positive hyperbolic uniaxial A-compensation film 36 is adjusted to be in the range of 92 nm Ro 184 nm, and the positive hyperbolic uniaxial A- is adjusted.
  • the value of the out-of-plane retardation compensation value Rth of the compensation film 36 is 46 nm Rth 92 nm, it is adjusted by the following formula:
  • Rth [(Nx+Ny)/2-Nz]*dl ;
  • Nx is the refractive index in the X direction of the maximum refractive index given in the plane of the positive hyperbolic uniaxial A-compensation film 36
  • Ny is the in-plane of the positive hyperbolic uniaxial A-compensation film 36
  • Nz is the refractive index in the thickness direction of the positive hyperbolic uniaxial A-compensation film 36
  • dl is the thickness of the positive hyperbolic uniaxial A-compensation film 36.
  • Nx > Ny, Ny Nz.
  • the compensation value Rth of the negative hyperbolic uniaxial C-compensation film 37 is adjusted in the range of Yl Rth Y2, and is obtained by the following adjustment:
  • Rth [(Mx+My)/2-Mz]*d2 ;
  • Mx is the refractive index in the X direction of the maximum refractive index given in the plane of the negative hyperbolic uniaxial C-compensation film 37
  • My is a negative hyperbolic uniaxial C-compensation film surface 37 orthogonal to the X direction
  • the refractive index in the Y direction, Mz is the refractive index in the thickness direction of the negative hyperbolic uniaxial C-compensation film 37
  • the embodiments of the present invention are mainly directed to two kinds of optical compensation films of the liquid crystal display at a wavelength of 550 nm, a liquid crystal optical path difference LCA ND at [324.3 nm, 342.8 nm], and a liquid crystal pretilt angle range of [85 °, 90 °]:
  • the double-curved uniaxial A-compensation film and the negative hyperbolic uniaxial C-compensation film can reduce the dark state light leakage phenomenon of the large viewing angle by adjusting the compensation values of the above two compensation films, and the invention can effectively increase the large viewing angle ( Contrast and sharpness of non-horizontal, large azimuth angles.

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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)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

一种液晶显示器及其光学补偿方法,可以有效的减弱大视角的暗态漏光现象,增加大视角的对比度和清晰度。具体是改变正性双折射单轴A-补偿膜(36)和负性双曲折单轴C-补偿膜(37)的补偿值,尤其是控制负性双曲折单轴C-补偿膜(37)的补偿值Rth的取值范围,通过调整两种补偿膜的补偿值来减弱暗态漏光现象。

Description

液晶显示器及其光学补偿方法
【技术领域】
本发明涉及液晶显示技术领域,特别是涉及一种液晶显示器 及其光学补偿方法。
【背景技术】
随着液晶显示面板的不断普及,对液晶显示面板显示质量的 要求越来越高。 以薄膜场效应晶体管液晶显示器 ( Thin Film Transistor LCD , TFT-LCD ) 为例, 随着 TFT-LCD的观察角度逐 渐增大, 画面的对比度不断降低, 画面的清晰度也逐渐下降。 这 是由于液晶层中液晶分子的双折射率随着观察角度变化发生改 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, 在一定的视角内能大幅度提高画面的对比度。
其中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。
针对不同的液晶显示模式, 使用的补偿膜也不同, 大尺寸液 晶电视使用的补偿膜大多是针对垂直配向 ( Vertical Alignment, VA ) 显示模式, 早期使用的有 Konica公司的 N-TAC , 后来不断 发展形成 OPOTES公司的 Zeonor , 富士通的 F-TAC系列, 日东 电工的 X-Plate等。 而针对相同的液晶光程差, 如果补偿膜补偿值不同, 则大视 角的暗态漏光就不同, 对比度也不同。 请参阅图 1 和图 2, 图 1 为现有技术中使用正性双曲折单轴 A-补偿膜 (unaxial positive birefringence A-Plate ) 与负性双曲折单轴 C-补偿膜 (unaxial Negative birefringence C-Plate ) 补偿暗态漏光等亮度分布 (Isoluminance contour)示意图, 图 2 为现有技术中使用 A-Plate 与 C-Plate补偿后的全视角相同对比度分布 ( Equal contrast ratio contour ) 示意图, 其中上述 A-Plate与 C-Plate补偿值如下表:
Figure imgf000003_0001
从图 1和图 2不难看出, 采用现有技术的 A-Plate与 C-Plate 补偿值, 在暗态下观看大视角会有严重漏光现象, 大视角的对比 度会变得较差, 视角范围很小。
因此, 需解决上述技术问题。
【发明内容】
本发明的目的在于提供一种液晶显示器及其光学补偿方法, 旨在现有技术中 A-Plate 与 C-Plate 的补偿值在暗态下观看大视 角会有严重漏光现象, 大视角的对比度会变得较差, 视角范围很 小的技术问题。 为解决上述技术问题, 本发明构造了一种液晶显示器, 其中 所述液晶显示器波长为 550nm, 所述液晶显示器在 550nm 处的 液晶光程差 LCAND范围 324.3nm LCAND 342.8nm,所述液 晶显示器包括:
第一基板;
第二基板;
液晶层, 设置于所述第一基板和第二基板之间;
第一偏光膜, 设置于所述第一基板的外侧;
第二偏光膜, 设置于所述第二基板的外侧;
一正性双曲折单轴 A-补偿膜; 以及
一负性双曲折单轴 C-补偿膜, 所述正性双曲折单轴 A-补偿 膜及所述负性双曲折单轴 C-补偿膜设置于所述第一基板与所述 第一偏光膜之间或者第二基板与第二偏光膜之间;
其中, 所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围为 92nm Ro 184nm, 其面外光程差补偿值 Rth 的取值范围为 46nm Rth 92nm; 所述负性双曲折单轴 C-补偿 膜的补偿值 Rth的取值范围为 Yl Rth Y2; 其中 Yl、 Υ2满足 下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5; Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17;
X 为所述正性双曲折单轴 Α-补偿膜的面外光程差补偿值
Rth。
为解决上述技术问题, 本发明还构造了一种液晶显示器, 所 述液晶显示器包括:
第一基板;
第二基板;
液晶层, 设置于所述第一基板和第二基板之间;
第一偏光膜, 设置于所述第一基板的外侧;
第二偏光膜, 设置于所述第二基板的外侧;
一正性双曲折单轴 A-补偿膜; 以及
一负性双曲折单轴 C-补偿膜, 所述正性双曲折单轴 A-补偿 膜及所述负性双曲折单轴 C-补偿膜设置于所述第一基板与所述 第一偏光膜之间或者第二基板与第二偏光膜之间;
所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro的取 值范围为 92nm Ro 184nm, 其面外光程差补偿值 Rth 的取值 范围为 46nm Rth 92nm; 所述负性双曲折单轴 C-补偿膜的补 偿值 Rth的取值范围为 Yl Rth Y2; 其中 Yl、 Υ2满足下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5;
Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17;
X 为所述正性双曲折单轴 Α-补偿膜的面外光程差补偿值
Rth。
为解决上述技术问题, 本发明还构造了一种液晶显示器的光 学补偿方法, 所述方法包括:
调整所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围在 92nm Ro 184nm;
调整所述正性双曲折单轴 A-补偿膜的面外光程差补偿值 Rth的取值范围在 46nm Rth 92nm;
调整所述负性双曲折单轴 C-补偿膜的补偿值 Rth 的取值范 围在 Yl Rth Y2; 其中 Yl、 Υ2满足下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5; Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17;
X 为所述正性双曲折单轴 Α-补偿膜的面外光程差补偿值 Rth; 所述正性双曲折单轴 A-补偿膜以及负性双曲折单轴 C-补偿 膜设置于所述液晶显示器的第一基板与第一偏光膜之间或者第 二基板与第二偏光膜之间。
本发明通过改变液晶显示器中正性双曲折单轴 A-补偿膜和 负性双曲折单轴 C-补偿膜的补偿值来减弱大视角的暗态漏光现 象, 实施本发明可以有效的增加大视角 (非水平, 垂直方位角的 大视角) 的对比度和清晰度。
为让本发明的上述内容能更明显易懂, 下文特举优选实施 例, 并配合所附图式, 作详细说明如下:
【附图说明】
图 1 为现有技术中使用 A-Plate 和 C-Plate 的补偿值补偿暗 态漏光等亮度分布示意图;
图 2 为现有技术中使用 A-Plate 和 C-Plate 的补偿值补偿后 全视角相同对比度分布示意图;
图 3为本发明液晶显示器的第 较佳实施例结构示意图; 图 4为本发明液晶显示器的第二较佳实施例结构示意图; 图 5为本发明液晶显示器的第三较佳实施例结构示意图; 图 6为本发明液晶显示器的第四较佳实施例结构示意图; 图 7 为液晶显示器在模拟过程中漏光量随延迟值的变化曲 图 8 为液晶显示器在模拟过程中漏光 随延迟值的变化曲 图 9 为 A-Plate和 C-Plate使用本发明一实施例补偿值后的 暗态漏光等亮度分布示意图;
图 10为 A-Plate和 C-Plate使用本发明一实施例补偿值后的 全视角相同对比度分布示意图;
图 11为 A-Plate和 C-Plate使用本发明另一实施例补偿值后 的暗态漏光等亮度分布示意图;
图 12为 A-Plate和 C-Plate使用本发明另一实施例补偿值后 的全视角相同对比度分布示意图;
图 13为 A-Plate和 C-Plate使用本发明又一实施例补偿值后 的暗态漏光等亮度分布示意图;
图 14为 A-Plate和 C-Plate使用本发明又一实施例补偿值后 的全视角相同对比度分布示意图。
【具体实施方式】
以下各实施例的说明是参考附加的图式,用以例示本发明可 用以实施的特定实施例。 本发明所提到的方向用语, 例如 「上」、 「下」、 「前」、 「后」、 「左」、 「右」、 「内」、 「外」、 「侧面」 等, 仅 是参考附加图式的方向。 因此, 使用的方向用语是用以说明及理 解本发明, 而非用以限制本发明。 在图中, 结构相似的单元是以 相同标号表示。
请参阅图 3, 图 3为本发明实施例中液晶显示器的第一较佳 实施例结构示意图。
本发明实施例的所述液晶显示器优选为垂直配向 ( Vertical Alignment, VA) 液晶显示器, 所述液晶显示器在波长范围为可 见光 ( 380nm, 760nm) 的区间, 优选为 550nm, 所述液晶显示 器在 550nm处的液晶光程差 LCAND范围 324.3nm LCA ND 342.8證,即区间 [324.3nm,342.8nm];而液晶预倾角 Pretilt angle 的范围 85° Pretilt angle〈90° , 即区间 [85° , 90° )。
在图 3所示的第一实施例中,所述液晶显示器包括第一基板 31、 第二基板 32、 液晶层 33、 第一偏光膜 34和第二偏光膜 35, 还包括一正性双曲折单轴 A-补偿膜 36 以及一负性双曲折单轴 C-补偿膜 37。 所述液晶层 33 设置于所述第一基板 31 和第二基 板 32之间,所述第一偏光膜 34设置于所述第一基板 31 的外侧, 所述第二偏光膜 35设置于所述第二基板 32的外侧。
在具体实施过程中, 所述正性双曲折单轴 A-补偿膜 36 以及 一负性双曲折单轴 C-补偿膜 37可设置于所述液晶层的相异的两 侧, 并设置于所述第一基板 31 与所述第一偏光膜 34或者第二基 板 31 与第二偏光膜 35之间。
譬如在图 3所示的第一较佳实施例中,所述正性双曲折单轴 A-补偿膜 36设置于所述第一基板 31与所述第一偏光膜 34之间, 所述负性双曲折单轴 C-补偿膜 37 设置于所述第二基板 32 与第 二偏光膜 35之间。
而在图 4 所示的第二较佳实施例中, 所述正性双曲折单轴 A-补偿膜 36设置于所述第二基板 32与第二偏光膜 35之间, 所 述负性双曲折单轴 C-补偿膜 37 则设置于所述第一基板 3 1 与所 述第一偏光膜 34之间。
当然, 在一些其它实施例中, 所述正性双曲折单轴 A-补偿 膜 36 以及负性双曲折单轴 C-补偿膜 37 还可设置于所述液晶层 的同侧, 并设置于所述第一基板 3 1 与所述第一偏光膜 34或者第 二基板 3 1 与第二偏光膜 35之间。
譬如在图 5所示的第三较佳实施例中,所述正性双曲折单轴 A-补偿膜 36 和所述负性双曲折单轴 C-补偿膜 37 贴合连接, 且 设置于所述第一基板 3 1 与所述第一偏光膜 34之间。
而在图 6 所示的第四较佳实施例中, 所述正性双曲折单轴 A-补偿膜 36 和所述负性双曲折单轴 C-补偿膜 37 贴合连接, 且 设置于所述第二基板 32与所述第二偏光膜 35之间。
上述液晶显示器的较佳实施例中, 所述第一偏光膜 34 的吸 收轴为 0度, 所述第二偏光膜 35 的吸收轴为 90度; 在一些其它 实施例中, 所述第一偏光膜 34的吸收轴为 90度、 且所述第二偏 光膜 35 的吸收轴为 0度时, 只要保证所述正性双曲折单轴 A-补 偿膜 36 或负性双曲折单轴 C-补偿膜 37 的慢轴分别与其在液晶 层 33 同一侧的偏光膜 (第一偏光膜 34 或第二偏光膜 35 ) 的吸 收轴垂直即可, 均适用于本发明。 其中, 本发明通过设置不同的正性双曲折单轴 A-补偿膜 36 与负性双曲折单轴 C-补偿膜 37的补偿值来模拟暗态漏光, 并根 据模拟结果获取暗态漏光对应的补偿值范围。
为了获得最佳的补偿效果, 在模拟过程中, 首先设置所述正 性双曲折单轴 A-补偿膜 36 以及所述负性双曲折单轴 C-补偿膜 37 的慢轴与其对应的偏光膜吸收轴的夹角为 90 ° , 并将所述液 晶显示器的液晶预倾角设置在范围为 [85 ° , 90 ° ); 将四个象限 内的液晶方位角 pretwist设置为 45 ° ,将液晶光程差 LCA ND设 置在区间 [324.3nm, 342.8nm] ; 并且模拟使用的光源为蓝光 -YAG ( Yttrium Aluminum Garnet ) LED 光谱, 其中央亮度定义为 100nit, 光源分布为朗伯 (Lambert ) 分布。
模拟结果请参阅图 7和 8所示的漏光量随延迟值的变化曲线 示意图, 其中图 7所示为在液晶光程差 LCA ND为 342.3nm, 预 倾角为 89 ° 和 85 ° 时,所述正性双曲折单轴 A-补偿膜 36的面内 延迟 Ro和厚度方向延迟 Rth、 以及负性双曲折单轴 C-补偿膜 37 的厚度方向延迟 Rth取不同值时的漏光量变化曲线示意图; 图 8 所示液晶光程差为 LCA ND 为 342.8nm、 预倾角为 89 ° 和 85 ° 时, 所述正性双曲折单轴 A-补偿膜 36 的面内延迟 Ro和厚度方 向延迟 Rth、 以及负性双曲折单轴 C-补偿膜 37 的厚度方向延迟 Rth 取不同值时的漏光量变化曲线示意图。 在图 7 和图 8 中的 A-Plate Ro 表示正性双曲折单轴 A-补偿膜 36 的面内延迟 Ro, A-Plate Rth 表示正性双曲折单轴 A-补偿膜 36 的厚度方向延迟 Rth , C-Plate Rth表示负性双曲折单轴 C-补偿膜 37 的厚度方向 延迟 Rth。
通过上述模拟, 得出在不同预倾角下, 所述正性双曲折单轴 A-补偿膜 36 与所述负性双曲折单轴 C-补偿膜 37 的补偿值对暗 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, 并根据模拟结果得出液晶光程差 LCAND 在 [324.3nm, 342.8nm]、 预倾角在 [85° , 90° )、 暗态 漏光小于 0.2nit (预倾角 =89° 时模拟出的暗态漏光值,非实测值) 时对应的正性双曲折单轴 A-补偿膜 36和负性双曲折单轴 C-补偿 膜 37 的延迟值范围如下:
所述正性双曲折单轴 A-补偿膜 36在波长 550nm处的面内光 程差补偿值 Ro的取值范围为: 92nm Ro 184nm, 面外光程差 补偿值 Rth的取值范围为: 46nm Rth 92nm; 所述负性双曲折 单轴 C-补偿膜 37的补偿值 Rth的取值范围为 Yl Rth Y2, 其 中 Yl、 Υ2满足下式 ( 1) 和 (2):
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5
( 1);
Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17
(2) 其中上式 ( 1) 和 (2) 中的 X为所述正性双曲折单轴 Α-补 偿膜的面外光程差补偿值 Rth。
上述补偿值范围用表格表示如下: LCA ND A-Plate A-Plate C-Plate
Ro Rth Rth
[324.3nm, 342.8nm] [92nm, 184nm] [46nm, 92nm] [Yl, Y2] 具体的, 所述正性双曲折单轴 A-补偿膜 36 的面内光程差补 偿值 Ro 以及面外光程差补偿值 Rth的范围通过如下公式 (3) 和 (4) 调整获得:
Ro= ( Nx-Ny) *dl; (3) Rth=[(Nx+Ny)/2-Nz]*dl; (4) 其中, Nx 为所述正性双曲折单轴 A-补偿膜 36 面内给出的 最大折射率的 X 方向的折射率, Ny 为所述正性双曲折单轴 A- 补偿膜 36 面内与 X方向正交的 Y方向的折射率, Nz 为所述正 性双曲折单轴 A-补偿膜 36厚度方向的折射率, dl 为所述正性双 曲折单轴 A-补偿膜 36的厚度, 且 Nx > Ny, Ny =Nz。
所述负性双曲折单轴 C-补偿膜的补偿值 Rth 的范围通过如 下公式 (5) 调整获得:
Rth=[(Mx+My)/2-Mz]*d2; (5) 其中 Mx为负性双曲折单轴 C-补偿膜 37面内给出的最大折 射率的 X方向的折射率, My为负性双曲折单轴 C-补偿膜 37面 内与 X 方向正交的 Y 方向的折射率, Mz 为负性双曲折单轴 C- 补偿膜 37 厚度方向的折射率, d2 为负性双曲折单轴 C-补偿膜 37的厚度, 且 Mx=My, My > Mz。
譬如, 以下面三个实施例 A、 B、 C 来进一步阐述如何根据 上述公式 (3)、 (4) 以及 (5) 来对正性双曲折单轴 A-补偿膜 36 和负性双曲折单轴 C-补偿膜 37进行调整。
(A) :当已知所述正性双曲折单轴 A-补偿膜 36的折射率 Nx Ny Nz 的值时, 调整所述正性双曲折单轴 A-补偿膜 36 的厚度 dl, 根据公式 (3) 和 (4), 将所述正性双曲折单轴 A-补偿膜 36 的面内光程差补偿值 Ro的取值范围调整为:92nm Ro 184nm 将其面外光程差补偿值 Rth 的取值范围调整为: 46nm Rth 92nm。
当已知所述负性双曲折单轴 C-补偿膜 37 的折射率 Mx My Mz 的值时, 调整所述负性双曲折单轴 C-补偿膜 37 的厚度 d2 根据公式(5),将所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth 的取值范围调整为 Yl Rth Y2。
(B) : 当已知所述正性双曲折单轴 A-补偿膜 36的厚度 dl 的 值时, 根据公式 (3) 和 (4) 调整所述正性双曲折单轴 A-补偿 膜 36 的折射率 Nx Ny Nz, 将所述正性双曲折单轴 A-补偿膜 36 的面内光程差补偿值 Ro 的取值范围调整为: 92nm Ro 184nm, 将其面外光程差补偿值 Rth的取值范围调整为: 46nm Rth^ 92
当已知所述负性双曲折单轴 C-补偿膜 37的厚度 d2的值时, 调整所述负性双曲折单轴 C-补偿膜 37的折射率 Mx My Mz, 根据公式(5),将所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth 的取值范围调整为 Yl Rth Y2。
(C) : 首先, 同时调整所述正性双曲折单轴 A-补偿膜 36 的 折射率 Nx Ny Nz和厚度 dl, 根据公式 (3) 和 (4), 将所述 正性双曲折单轴 A-补偿膜 36 的面内光程差补偿值 Ro 的取值范 围调整为: 92nm Ro 184nm, 将其面外光程差补偿值 Rth的取 值范围调整为: 46nm Rth 92nm; 然后, 同时调整所述负性双 曲折单轴 C-补偿膜 37 的折射率 Mx、 My、 Mz和厚度 d2, 根据 公式 (5), 将所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth的 取值范围调整为 Yl Rth Y2。
以下以三个具体的实施例 1)、 2) 和 3) 来说明本发明的技 术效果:
1)、 选取液晶光程差 LCAND = 333.5nm, 预倾角 =89° , 所 述正性双曲折单轴 A-补偿膜 36的补偿值 Ro = 144nm,Rth=72nm, 所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth=195nm, 上述补 偿值对应的暗态漏光等亮度分布图如图 9所示,对应的全视角相 同对比度分布图如图 10所示, 其中上述补偿值的表格如下:
Figure imgf000014_0001
2)、 选取液晶光程差 LCAND = 333.5nm, 预倾角 =89° , 所 述正性双曲折单轴 A-补偿膜 36的补偿值 Ro = 144nm,Rth=72nm, 所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth=230nm, 上述补 偿值对应的暗态漏光等亮度分布图如图 Π 所示, 对应的全视角 相同对比度分布图如图 12所示, 其中上述补偿值的表格如下: 液晶预 A-plate A-plate C-plate
液晶光程差
倾角 Ro Rth Rth
333.5nm 89度 144證 72nm 230證
3 )、 选取液晶光程差 LC A ND = 333.5nm, 预倾角 =89 ° , 所 述正性双曲折单轴 A-补偿膜 36的补偿值 Ro = 144nm, Rth=72nm, 所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth=282nm, 上述补 偿值对应的暗态漏光等亮度分布图如图 13 所示, 对应的全视角 相同对比度分布图如图 14所示, 其中上述补偿值的表格如下:
Figure imgf000015_0001
将使用本发明实施例补偿值的暗态漏光等亮度分布效果示 意图 9、 11 、 13与现有技术的效果示意图 1进行对比, 可以得出: 使用本发明实施例的补偿值的正性双曲折单轴 A-补偿膜 36与负 性双曲折单轴 C-补偿膜 37 补偿后的暗态漏光最大值降低到 0.2 之内, 远低于现有技术的 1 .89。 将使用本发明实施例补偿值的全视角相同对比度分布效果 示意图 10、 12、 14与现有技术的效果示意图 2进行对比, 可以 得出: 使用本发明实施例的补偿值的正性双曲折单轴 A-补偿膜 36与负性双曲折单轴 C-补偿膜 37补偿后的全视角对比度分布优 于现有技术的全视角对比度分布。 由此, 本发明改善了现有技术 中使用 A-plate 与 C-plate 补偿值造成的暗态漏光严重现象的问 题, 有效地提高了大视角 (非水平垂直方位角) 的对比度和观看 的清晰度。
本发明还提供一种使用液晶显示器光学补偿方法, 该方法针 对 VA液晶显示器而言, 且所述液晶显示器在波长范围为可见光 ( 380nm, 760nm) 的区间, 优选为 550nm, 所述液晶显示器在 波长为 550nm 处的液晶光程差 LCAND 范围为 [324.3nm, 342.8nm], 其液晶预倾角范围为 [85 ° , 90° )。 其中所述液晶显 示器包括一正性双曲折单轴 A-补偿膜 36以及一负性双曲折单轴 C-补偿膜 37,所述正性双曲折单轴 A-补偿膜 36 以及负性双曲折 单轴 C-补偿膜 37 设置于所述液晶层 33 的相异的两侧, 且设置 于所述第一基板 31 与所述第一偏光膜 34或者第二基板 32与第 二偏光膜 35 之间, 譬如请参阅图 3 和图 4; 所述正性双曲折单 轴 A-补偿膜 36 以及负性双曲折单轴 C-补偿膜 37也可设置于所 述液晶层 33 的同侧, 且设置于所述第一基板 31 与所述第一偏光 膜 34或者第二基板 33 与第二偏光膜 35 之间, 譬如请参阅图 5 和图 6。
而本发明实施例的液晶显示器光学补偿方法包括:
( I )、 将正性双曲折单轴 A-补偿膜 36 的面内光程差补偿 值 Ro的取值范围调整为 92nm Ro 184nm。
( II )、 将正性双曲折单轴 A-补偿膜 36 面外光程差补偿值 Rth的取值范围调整为 46nm Rth 92nm。
(III) , 将负性双曲折单轴 C-补偿膜 37 的补偿值 Rth 的取 值范围调整为 Yl Rth Y2; 其中: Yl=0.0000826x -0.022868x'+2.4074x -114.326X+2251.5; Y2=-0.00006472x4+0.017705x -1.8284x2+84.4843x-l 181.17;
X为正性双曲折单轴 Α-补偿膜 36的面外光程差补偿值 Rth。 需要说明的是, 上述步骤 ( I )、 ( II ) 和 (III) 并不分先后。 在具体实施过程中, 调整所述正性双曲折单轴 A-补偿膜 36 的面内光程差补偿值 Ro的取值范围在 92nm Ro 184nm, 并调 整所述正性双曲折单轴 A-补偿膜 36的面外光程差补偿值 Rth的 取值范围在 46nm Rth 92nm时, 通过下式进行调整获得:
Ro= ( Nx-Ny) *dl;
Rth=[(Nx+Ny)/2-Nz]*dl;
其中, Nx 为所述正性双曲折单轴 A-补偿膜 36 面内给出的 最大折射率的 X 方向的折射率, Ny 为所述正性双曲折单轴 A- 补偿膜 36 面内与 X方向正交的 Y方向的折射率, Nz为所述正 性双曲折单轴 A-补偿膜 36厚度方向的折射率, dl 为所述正性双 曲折单轴 A-补偿膜 36的厚度, 且 Nx > Ny, Ny =Nz。
在具体实施过程中, 调整所述负性双曲折单轴 C-补偿膜 37 的补偿值 Rth 的取值范围在 Yl Rth Y2 时, 通过下式调整获 得:
Rth=[(Mx+My)/2-Mz]*d2;
其中 Mx为负性双曲折单轴 C-补偿膜 37面内给出的最大折 射率的 X方向的折射率, My 为负性双曲折单轴 C-补偿膜面 37 内与 X 方向正交的 Y方向的折射率, Mz 为负性双曲折单轴 C- 补偿膜 37 厚度方向的折射率, d2 为负性双曲折单轴 C-补偿膜 37的厚度, 且 Mx=My, My > Mz。
具体的调整补偿值的过程请参阅上文针对液晶显示器的详 细描述, 此处不再赘述。
本发明实施例主要是针对该液晶显示器在波长 550nm、液晶 光程差 LCA ND 在 [324.3nm, 342.8nm] , 液晶预倾角范围为 [85 ° , 90 ° ) 的两种光学补偿膜: 正性双曲折单轴 A-补偿膜和负性 双曲折单轴 C-补偿膜, 通过调整上述两种补偿膜的补偿值来减 弱大视角的暗态漏光现象, 实施本发明可以有效的增加大视角 (非水平, 垂直方位角的大视角) 的对比度和清晰度。
综上所述, 虽然本发明已以优选实施例揭露如上, 但上述优 选实施例并非用以限制本发明, 本领域的普通技术人员, 在不脱 离本发明的精神和范围内, 均可作各种更动与润饰, 因此本发明 的保护范围以权利要求界定的范围为准。

Claims

权 利 要 求 书
1、 一种液晶显示器, 其中所述液晶显示器波长为 550nm, 所述液晶显示器在 550nm处的液晶光程差 LCAND范围 324.3nm ^LCAND^ 342.8nm, 所述液晶显示器包括:
第一基板;
第二基板;
液晶层, 设置于所述第一基板和第二基板之间;
第一偏光膜, 设置于所述第一基板的外侧;
第二偏光膜, 设置于所述第二基板的外侧;
一正性双曲折单轴 A-补偿膜; 以及
一负性双曲折单轴 C-补偿膜, 所述正性双曲折单轴 A-补偿 膜及所述负性双曲折单轴 C-补偿膜设置于所述第一基板与所述 第一偏光膜之间或者第二基板与第二偏光膜之间;
其中, 所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围为 92nm Ro 184nm, 其面外光程差补偿值 Rth 的取值范围为 46nm Rth 92nm; 所述负性双曲折单轴 C-补偿 膜的补偿值 Rth的取值范围为 Yl Rth Y2; 其中 Yl、 Υ2满足 下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5; Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17;
X 为所述正性双曲折单轴 Α-补偿膜的面外光程差补偿值 Rth。
2、 根据权利要求 1 所述的液晶显示器, 其中所述正性双曲 折单轴 A-补偿膜的面内光程差补偿值 Ro以及面外光程差补偿值 Rth的范围通过如下公式调整获得:
Ro= ( Nx-Ny ) *dl ;
Rth=[(Nx+Ny)/2-Nz] *dl
其中, Nx为所述正性双曲折单轴 A-补偿膜面内给出的最大 折射率的 X方向的折射率, Ny为所述正性双曲折单轴 A-补偿膜 面内与 X方向正交的 Y方向的折射率, Nz为所述正性双曲折单 轴 A-补偿膜厚度方向的折射率, dl 为所述正性双曲折单轴 A-补 偿膜的厚度, 且 Nx > Ny, 且 Ny =Nz。
3、 根据权利要求 1 所述的液晶显示器, 其中所述负性双曲 折单轴 C-补偿膜的补偿值 Rth的范围通过如下公式调整获得:
Rth=[(Mx+My)/2-Mz] *d2 ;
其中 Mx 为负性双曲折单轴 C-补偿膜面内给出的最大折射 率的 X方向的折射率, My为负性双曲折单轴 C-补偿膜面内与 X 方向正交的 Y方向的折射率, Mz为负性双曲折单轴 C-补偿膜厚 度方向的折射率, d2 为所述负性双曲折单轴 C-补偿膜的厚度, Mx = My, 且 My > Mz。
4、 根据权利要求 1 所述的液晶显示器, 其中所述一正性双 曲折单轴 A-补偿膜以及一负性双曲折单轴 C-补偿膜设置于所述 液晶层的相异的两侧, 且设置于所述第一基板与所述第一偏光膜 之间或者第二基板与第二偏光膜之间。
5、 根据权利要求 1 所述的液晶显示器, 其中所述一正性双 曲折单轴 A-补偿膜以及一负性双曲折单轴 C-补偿膜设置于所述 液晶层的同侧, 且设置于所述第一基板与所述第一偏光膜之间或 者第二基板与第二偏光膜之间。
6、 一种液晶显示器, 其中所述液晶显示器包括:
第一基板;
第二基板;
液晶层, 设置于所述第一基板和第二基板之间;
第一偏光膜, 设置于所述第一基板的外侧;
第二偏光膜, 设置于所述第二基板的外侧;
一正性双曲折单轴 A-补偿膜; 以及
一负性双曲折单轴 C-补偿膜, 所述正性双曲折单轴 A-补偿 膜及所述负性双曲折单轴 C-补偿膜设置于所述第一基板与所述 第一偏光膜之间或者第二基板与第二偏光膜之间;
其中, 所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围为 92nm Ro 184nm, 其面外光程差补偿值 Rth 的取值范围为 46nm Rth 92nm; 所述负性双曲折单轴 C-补偿 膜的补偿值 Rth的取值范围为 Yl Rth Y2; 其中 Yl、 Υ2满足 下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5; Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17; X 为所述正性双曲折单轴 A-补偿膜的面外光程差补偿值
Rth。
7、 根据权利要求 6 所述的液晶显示器, 其中所述正性双曲 折单轴 A-补偿膜的面内光程差补偿值 Ro以及面外光程差补偿值 Rth的范围通过如下公式调整获得:
Ro= ( Nx-Ny ) *dl ;
Rth=[(Nx+Ny)/2-Nz] *dl
其中, Nx为所述正性双曲折单轴 A-补偿膜面内给出的最大 折射率的 X方向的折射率, Ny为所述正性双曲折单轴 A-补偿膜 面内与 X方向正交的 Y方向的折射率, Nz为所述正性双曲折单 轴 A-补偿膜厚度方向的折射率, dl 为所述正性双曲折单轴 A-补 偿膜的厚度, 且 Nx > Ny, 且 Ny =Nz。
8、 根据权利要求 6 所述的液晶显示器, 其中所述负性双曲 折单轴 C-补偿膜的补偿值 Rth的范围通过如下公式调整获得:
Rth=[(Mx+My)/2-Mz] *d2 ;
其中 Mx 为负性双曲折单轴 C-补偿膜面内给出的最大折射 率的 X方向的折射率, My为负性双曲折单轴 C-补偿膜面内与 X 方向正交的 Y方向的折射率, Mz为负性双曲折单轴 C-补偿膜厚 度方向的折射率, d2 为所述负性双曲折单轴 C-补偿膜的厚度, Mx = My, 且 My > Mz。
9、 根据权利要求 6 所述的液晶显示器, 其中所述一正性双 曲折单轴 A-补偿膜以及一负性双曲折单轴 C-补偿膜设置于所述 液晶层的相异的两侧, 且设置于所述第一基板与所述第一偏光膜 之间或者第二基板与第二偏光膜之间。
10、 根据权利要求 6所述的液晶显示器, 其中所述一正性双 曲折单轴 A-补偿膜以及一负性双曲折单轴 C-补偿膜设置于所述 液晶层的同侧, 且设置于所述第一基板与所述第一偏光膜之间或 者第二基板与第二偏光膜之间。
11、 一种液晶显示器的光学补偿方法, 其中所述方法包括: 调整所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围在 92nm Ro 184nm;
调整所述正性双曲折单轴 A-补偿膜的面外光程差补偿值 Rth的取值范围在 46nm Rth 92nm; 以及
调整所述负性双曲折单轴 C-补偿膜的补偿值 Rth 的取值范 围在 Yl Rth Y2; 其中 Yl、 Υ2满足下式:
Υ1=0.0000826χ4-0.022868χ +2.4074χ2-114.326χ+2251.5;
Υ2=-0.00006472χ4+0.017705χ -1.8284χ2+84.4843χ-1181.17;
X 为所述正性双曲折单轴 Α-补偿膜的面外光程差补偿值 Rth; 所述正性双曲折单轴 A-补偿膜以及负性双曲折单轴 C-补偿 膜设置于所述液晶显示器的第一基板与第一偏光膜之间或者第 二基板与第二偏光膜之间。
12、 根据权利要求 11 所述的液晶显示器的光学补偿方法, 其中调整所述正性双曲折单轴 A-补偿膜的面内光程差补偿值 Ro 的取值范围在 92nm Ro 184nm, 并调整所述正性双曲折单轴 A-补偿膜的面外光程差补偿值 Rth 的取值范围在 46nm Rth 92nm时, 通过下式进行调整获得:
Ro= ( Nx-Ny ) *dl ;
Rth=[(Nx+Ny)/2-Nz] *dl
其中, Nx为所述正性双曲折单轴 A-补偿膜面内给出的最大 折射率的 X方向的折射率, Ny为所述正性双曲折单轴 A-补偿膜 面内与 X方向正交的 Y方向的折射率, Nz为所述正性双曲折单 轴 A-补偿膜厚度方向的折射率, dl 为所述正性双曲折单轴 A-补 偿膜的厚度, Nx > Ny, 且 Ny =Nz。。
13、 根据权利要求 11 所述的液晶显示器的光学补偿方法, 其中调整所述负性双曲折单轴 C-补偿膜的补偿值 Rth 的取值范 围在 Y l Rth Y2时, 通过下式调整获得:
Rth=[(Mx+My)/2-Mz] *d2 ;
其中 Mx 为负性双曲折单轴 C-补偿膜面内给出的最大折射 率的 X方向的折射率, My为负性双曲折单轴 C-补偿膜面内与 X 方向正交的 Y方向的折射率, Mz为负性双曲折单轴 C-补偿膜厚 度方向的折射率, d2 为所述负性双曲折单轴 C-补偿膜的厚度, Mx = My, 且 My > Mz。
14、 根据权利要求 11 所述的液晶显示器的光学补偿方法, 其中所述一正性双曲折单轴 A-补偿膜以及一个负性双曲折单轴 C-补偿膜设置于所述液晶层的相异的两侧, 且设置于所述第一基 板与所述第一偏光膜之间或者第二基板与第二偏光膜之间。
15、 根据权利要求 11 所述的液晶显示器的光学补偿方法, 其中所述一正性双曲折单轴 A-补偿膜以及一负性双曲折单轴 C- 补偿膜设置于所述液晶层的同侧, 且设置于所述第一基板与所述 第一偏光膜之间或者第二基板与第二偏光膜之间。
PCT/CN2013/079240 2013-07-10 2013-07-11 液晶显示器及其光学补偿方法 Ceased WO2015003371A1 (zh)

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CN103605239B (zh) * 2013-11-22 2016-08-17 深圳市华星光电技术有限公司 一种液晶显示器
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