WO2018032572A1 - 液晶面板及具有该液晶面板的液晶显示器 - Google Patents

液晶面板及具有该液晶面板的液晶显示器 Download PDF

Info

Publication number
WO2018032572A1
WO2018032572A1 PCT/CN2016/099496 CN2016099496W WO2018032572A1 WO 2018032572 A1 WO2018032572 A1 WO 2018032572A1 CN 2016099496 W CN2016099496 W CN 2016099496W WO 2018032572 A1 WO2018032572 A1 WO 2018032572A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
polarizer
axis direction
wave plate
crystal panel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/099496
Other languages
English (en)
French (fr)
Inventor
海博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US15/311,507 priority Critical patent/US10295864B2/en
Publication of WO2018032572A1 publication Critical patent/WO2018032572A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—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
    • G02F1/133528—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
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • 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
    • G02F2413/04—Number of plates greater than or equal to 4
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a liquid crystal panel and a liquid crystal display having the same.
  • LCDs liquid crystal displays
  • the liquid crystal display usually includes a liquid crystal panel and a backlight module.
  • the liquid crystal panel does not emit light. Therefore, the backlight module is required to provide a uniform surface light source to the liquid crystal panel to display an image on the liquid crystal panel.
  • the liquid crystal panel In the liquid crystal panel, if there is no polarizing effect of the polarizer, the liquid crystal panel cannot display the screen normally.
  • the polarizer absorbs light perpendicular to the polarization axis and transmits only light along the polarization axis, thereby converting natural light into linearly polarized light.
  • the vertical alignment mode of the VA (Vertical Alignment) display mode refers to a display mode in which liquid crystal molecules are vertically aligned with the substrate.
  • the VA display mode has the advantages of wide viewing angle, high contrast, and no need for friction alignment, making it a display mode commonly used in large-sized liquid crystal panels.
  • the incident light does not deflect after passing through the liquid crystal panel having the VA display mode, so that the upper and lower polarizers disposed outside the liquid crystal display unit of the liquid crystal panel are vertically offset when no voltage is applied (ie, the upper and lower polarizers are The absorption axis is perpendicular or parallel (ie, the absorption axes of the upper and lower polarizers are parallel) determines the normally black mode or the normally white mode of the liquid crystal panel.
  • the normal white mode is generally used when the upper and lower polarizers are parallel to each other: the normal black mode is when the upper and lower polarizers are vertically offset.
  • the VA display mode uses the normal black mode without applying voltage, that is, the upper and lower polarization
  • the film is vertically offset. In this way, the brightness is very low in the dark state, and high contrast can be achieved, and when the pixel is damaged, it is dark, and it appears as a dark point, which has less influence on the display of the picture.
  • the polarizer web cannot be cut into the same size and absorbs the polarizer perpendicular to the axis. Therefore, the large-size liquid crystal panel exceeding the width of the polarizer cannot normally realize the normally black mode according to the existing architecture.
  • the present invention provides a liquid crystal panel in which upper and lower polarizers are aligned in parallel, and a liquid crystal display having the liquid crystal panel.
  • a liquid crystal panel includes: a first polarizer and a second polarizer disposed opposite to each other; and a liquid crystal cell disposed between the first polarizer and the second polarizer a first quarter wave plate disposed between the first polarizer and the liquid crystal cell; and a second quarter wave disposed between the second polarizer and the liquid crystal cell a sheet; wherein an absorption axis direction of the first polarizer coincides with an absorption axis direction of the second polarizer, and an optical axis direction of the first quarter wave plate and the second quarter The optical axes of the wave plates are in the same direction.
  • an angle between an absorption axis direction of the first polarizer and an optical axis direction of the first quarter wave plate is 45 degrees or 135 degrees.
  • the optical axis direction of the first quarter wave plate is 45 degrees or 135 degrees.
  • the optical axis direction of the first quarter wave plate is 45 degrees or 135 degrees.
  • the liquid crystal panel further includes: a first compensation film disposed between the first quarter wave plate and the liquid crystal cell; and a second quarter wave plate disposed on the second a second compensation film between the liquid crystal cells; wherein a slow axis direction of the first compensation film is consistent with a slow axis direction of the second compensation film, and the first compensation film is slow The axial direction coincides with the optical axis direction of the first quarter wave plate.
  • the liquid crystal panel further includes: disposed on the first quarter wave plate and a first compensation film between the first polarizers; and a second compensation film disposed between the second quarter wave plate and the first polarizer; wherein the first The slow axis direction of the compensation film coincides with the slow axis direction of the second compensation film, and the slow axis direction of the first compensation film coincides with the optical axis direction of the first quarter wave plate.
  • the optical axis direction of the first quarter wave plate and the slow axis direction of the first compensation film are both 45 degrees or 135 degrees.
  • the optical axis direction of the first quarter wave plate and the slow axis direction of the first compensation film are both 45 degrees or 135 degrees.
  • the liquid crystal panel further includes: a first protective film disposed on a surface of the first polarizer facing away from the liquid crystal cell; and disposed opposite to the liquid crystal cell of the second polarizer a second protective film on the surface; a first pressure sensitive adhesive layer disposed between the first compensation film and the liquid crystal cell; and a second compensation film and the liquid crystal cell a second pressure sensitive adhesive layer.
  • the liquid crystal panel further includes: a first protective film disposed on a surface of the first polarizer facing away from the liquid crystal cell; and disposed on the back of the second polarizer facing away from the liquid crystal cell a second protective film on the surface; a first pressure sensitive adhesive layer disposed between the first quarter wave plate and the liquid crystal cell; and a second quarter wave plate disposed on the surface a second pressure sensitive adhesive layer between the liquid crystal cells.
  • the compensation value of the first quarter wavelength, the compensation value of the second quarter wavelength, the compensation value of the first compensation film, and the compensation value of the second compensation film The sum is equal to one quarter of the wavelength of the incident light.
  • a liquid crystal display including a liquid crystal panel and a backlight module disposed oppositely, the backlight module provides a display light source to the liquid crystal panel, and the liquid crystal panel is the liquid crystal panel described above.
  • the invention has the beneficial effects that the liquid crystal panel of the invention can realize the normally black mode when the two polarizers are aligned in parallel and no voltage is applied, and the contrast thereof is effectively improved.
  • FIG. 1a shows an architectural diagram of a normally black mode of a conventional liquid crystal panel
  • FIG. 1b shows an architectural diagram of a normally white mode of a conventional liquid crystal panel
  • FIG. 2a is a block diagram showing a normal black mode of a liquid crystal panel when no voltage is applied, according to an embodiment of the present invention
  • FIG. 2b is a block diagram showing a normal black mode of a liquid crystal panel when no voltage is applied, according to another embodiment of the present invention.
  • FIG. 3 is a graph showing a trend of a luminance of a center point of a liquid crystal panel at a wavelength of 450 nm with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention
  • FIG. 4 is a graph showing a change trend of a center point luminance of a liquid crystal panel at a wavelength of 550 nm with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention
  • FIG. 5 is a graph showing a change trend of a center point luminance of a liquid crystal panel at a wavelength of 650 nm with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention
  • FIG. 6 is a graph showing the relationship between the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm and the wavelength of visible light according to an embodiment of the present invention
  • FIG. 7 shows a schematic diagram of a liquid crystal display according to an embodiment of the present invention.
  • FIG. 2a shows an architectural diagram of a liquid crystal panel implementing a normally black mode when no voltage is applied, in accordance with an embodiment of the present invention.
  • a liquid crystal panel 100 includes a liquid crystal cell 110, a first polarizer 120a and a second polarizer 120b, a first quarter wave plate 130a, and a second quarter wave plate. 130b, a first compensation film 140a and a second compensation film 140b, a first protective film 150a and a second protective film 150b, a first pressure-sensitive adhesive layer 160a and a second pressure-sensitive adhesive layer 160b.
  • the first polarizer 120a and the second polarizer 120b are disposed opposite to each other, and the liquid crystal cell 110 is interposed between the first polarizer 120a and the second polarizer 120b.
  • the liquid crystal cell 110 includes a color filter substrate and an array substrate of the pair of boxes, and a liquid crystal layer interposed between the color filter substrate and the array substrate.
  • the liquid crystal cell 110 has a VA (Vertical Alignment) display mode and contains a plurality of liquid crystal molecules.
  • the first quarter wave plate 130a is disposed between the first polarizer 120a and the liquid crystal cell 110
  • the second quarter wave plate 130b is disposed between the second polarizer 120b and the liquid crystal cell 110.
  • the absorption axis (or absorption axis) direction of the first polarizer 120a coincides with the absorption axis (or absorption axis) direction of the second polarizer 120b
  • the optical axis direction of the first quarter wave plate 130a is
  • the optical axis directions of the second quarter-wave plate 130b are uniform, and the angle between the absorption axis direction of the first polarizer 120a and the optical axis direction of the first quarter-wave plate 130a is 45 degrees or 135 degrees.
  • the absorption axis direction of the first polarizer 120a and the absorption axis direction of the second polarizer 120b may both be 0 degrees, at this time, the optical axis direction of the first quarter wave plate 130a and The second quarter wave plate 130b may have an optical axis direction of 45 degrees or 135 degrees.
  • the absorption axis direction of the first polarizer 120a and the absorption axis direction of the second polarizer 120b may both be 90 degrees, and at this time, the optical axis direction of the first quarter wave plate 130a
  • the optical axis direction of the second quarter wave plate 130b may be 45 degrees or 135 degrees.
  • the first compensation film 140a is disposed between the first quarter wave plate 130a and the liquid crystal cell 110, and the second compensation film is disposed.
  • the 140b is disposed between the second quarter wave plate 130b and the liquid crystal cell 110. That is, the liquid crystal panel 100 of the present invention may not require the provision of the first compensation film 140a and the second compensation film 140b.
  • the first compensation film 140a and the second compensation film 140b can also function to isolate water vapor and support the polarizer.
  • the slow axis direction of the first compensation film 140a coincides with the slow axis direction of the second compensation film 140b, and the slow axis direction of the first compensation film 140a coincides with the optical axis direction of the first quarter wave plate 130a.
  • the absorption axis direction of the first polarizer 120a and the absorption axis direction of the second polarizer 120b may both be 0 degrees.
  • the optical axis direction of the first quarter wave plate 130a, The optical axis direction of the second quarter wave plate 130b, the slow axis direction of the first compensation film 140a, and the slow axis direction of the second compensation film 140b may both be 45 degrees or 135 degrees.
  • the absorption axis direction of the first polarizer 120a and the absorption axis direction of the second polarizer 120b may both be 90 degrees, and at this time, the optical axis direction of the first quarter wave plate 130a
  • the optical axis direction of the second quarter wave plate 130b, the slow axis direction of the first compensation film 140a, and the slow axis direction of the second compensation film 140b may both be 45 degrees or 135 degrees.
  • the first protective film 150a is disposed on a surface of the first polarizer 120a facing away from the liquid crystal cell 110, and the second protective film 150b is disposed on the surface of the first polarizer 120a.
  • the second polarizer 120b faces away from the surface of the liquid crystal cell 110. That is, the liquid crystal panel 100 of the present invention may not require the provision of the first protective film 150a and the second protective film 150b.
  • the first protective film 150a and the second protective film 150b can also function to block moisture and support the polarizer.
  • the first pressure sensitive adhesive layer 160a is disposed between the first compensation film 140a and the liquid crystal cell 110, and the second pressure sensitive adhesive layer 160b is disposed between the second compensation film 140b and the liquid crystal cell 110. It should be noted that when the first compensation film 140a and the second compensation film 140b themselves have a viscous function, the first pressure-sensitive adhesive layer 160a and the second pressure-sensitive adhesive layer 160b may be omitted.
  • FIG. 2b is a block diagram showing a normal black mode of a liquid crystal panel when no voltage is applied, according to another embodiment of the present invention.
  • the first compensation film 140a is disposed between the first quarter wave plate 130a and the first polarizer 120a, and the second compensation is performed.
  • the diaphragm 140b is disposed between the second quarter wave plate 130b and the second polarizer 120b.
  • the first pressure sensitive adhesive layer 160a is disposed between the first quarter wave plate 130a and the liquid crystal cell 110
  • the second pressure sensitive adhesive layer 160b is disposed on the second quarter wave plate 130b and Between the liquid crystal cells 110.
  • the simulation is performed using the LCD Master software.
  • the simulation settings are as follows:
  • Biaxial setting The angle between the slow axis and the absorption axis of the first polarizer 120a is 45 degrees.
  • Light source setting 1. Spectrum of Blue-YAG LED; 2. Central brightness is defined as 100 nit; 3. Light source distribution is Lambert's distribution.
  • the dark state luminance (unit: nit) refers to the brightness of the above-described liquid crystal panel 100 when no voltage (0 V) is applied; the bright state brightness (unit: nit) refers to the liquid crystal panel 100 is added.
  • the brightness at the voltage (7V); the contrast is the ratio of the brightness of the bright state to the brightness of the dark state.
  • Table 1 shows the dark state brightness, bright state brightness, and contrast of the liquid crystal panel shown in Fig. 1a in the normally black mode.
  • Table 2 shows various parameters of the quarter-wave plate (i.e., the first quarter-wave plate 130a and the second quarter-wave plate 130b) of the present embodiment at wavelengths of incident light of 450 nm, 550 nm, and 650 nm, respectively. .
  • Nx is the refractive index of the quarter-wave plate on the x-axis
  • Ny is the refractive index of the quarter-wave plate on the y-axis
  • Ro is the quarter-wave plate at a predetermined wavelength
  • the compensation value of the quarter-wave plate at a predetermined wavelength can be adjusted. size.
  • Table 3 shows simulation results of the liquid crystal panel 100 implementing the normally black mode when no voltage is applied and the normally white mode when voltage is applied, according to an embodiment of the present invention.
  • the slow axis directions of the compensation films ie, the first compensation film 140a and the second compensation film 140b
  • the angle is 90 degrees.
  • the liquid crystal panel 100 when the optical axis direction of the quarter-wave plate is parallel or perpendicular to the absorption axis direction of the polarizer, the liquid crystal panel 100 is in a bright state when no voltage is applied, and exhibits a normally white mode.
  • the angle between the optical axis direction of the quarter-wave plate and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, the liquid crystal panel 100 is in a dark state when no voltage is applied, and exhibits a normally black mode.
  • the dark state brightness of the liquid crystal panel 100 when no voltage is applied causes the contrast of the liquid crystal panel 100 to be low, which is much lower than the 1720 shown in Table 1. Therefore, it is necessary to redesign the parameters of the appropriate quarter wave plate to reduce the dark state brightness.
  • the parameters of the appropriate quarter-wave plate will be simulated with the wavelengths of the incident light of 450 nm, 550 nm and 650 nm as an example, so that the contrast of the liquid crystal panel 100 according to the embodiment of the present invention is equivalent to that in Table 1.
  • the contrast of the liquid crystal panel with the existing architecture is shown. Since the parameter Nx and the parameter Ny of the quarter wave plate at a certain predetermined wavelength are constant values, the size of the compensation value Ro of the quarter wave plate at the preset wavelength can only be redesigned to reduce the present invention.
  • the contrast of the liquid crystal panel of the embodiment changes the size of the thickness d of the quarter wave plate. Two schemes were designed to simulate the size of the appropriate compensation value Ro for the quarter-wave plate.
  • Solution 1 Set the angle between the optical axis direction of the quarter-wave plate and the absorption axis direction of the polarizer to be 45 degrees or 135 degrees, and the angle between the slow axis direction of the compensation diaphragm and the absorption axis direction of the polarizer is At 90 degrees, the compensation values Ro of the first compensation film 140a and the second compensation film 140b are both 28 nm.
  • Option 2 set the angle between the optical axis direction of the quarter-wave plate and the absorption axis direction of the polarizer to be 45 degrees or 135 degrees, and the angle between the slow axis direction of the compensation diaphragm and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, the compensation values Ro of the first compensation film 140a and the second compensation film 140b are both 28 nm.
  • the magnitude of the compensation value Ro of the quarter-wave plate is changed to simulate the change tendency of the center point luminance (unit: nit) of the liquid crystal panel 100 of the embodiment of the present invention.
  • the center point brightness of the liquid crystal panel 100 refers to the brightness at the center of the liquid crystal panel 100 when the liquid crystal panel 100 is viewed.
  • FIG 3 is a graph showing a trend of a luminance of a center point of a liquid crystal panel at a wavelength of 450 nm of incident light with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention.
  • the center point brightness of the liquid crystal panel 100 is four quarters.
  • the compensation value Ro of a wave plate increases from large to small, then from small to large, and when the compensation value Ro of the quarter wave plate is about a quarter of the wavelength of 450 nm (ie, a quarter wave)
  • the compensation value Ro of the sheet is about 117.5 nm
  • the brightness of the center point of the liquid crystal panel 100 is the smallest.
  • the center point brightness of the liquid crystal panel 100 when the angle between the slow axis direction of the compensation film and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, the center point brightness of the liquid crystal panel 100 according to the embodiment of the present invention is one quarter.
  • the sum of the compensation value Ro of the wave plate and the compensation value Ro of the compensation diaphragm increases from large to small, and then from small to large, and when the compensation value Ro of the quarter wave plate and the compensation value of the compensation diaphragm
  • the sum of Ro is about wave
  • the center point brightness is the smallest when a quarter of a length of 450 nm (i.e., the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm is about 117.5 nm).
  • FIG. 4 is a graph showing a trend of a luminance of a center point of a liquid crystal panel at a wavelength of 550 nm of incident light with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention.
  • the center point brightness of the liquid crystal panel 100 is four quarters.
  • the compensation value Ro of a wave plate increases from large to small, then from small to large, and when the compensation value Ro of the quarter wave plate is about a quarter of the wavelength 550 nm (ie, a quarter wave)
  • the compensation value Ro of the sheet is about 137.5 nm
  • the brightness of the center point of the liquid crystal panel 100 is the smallest.
  • the center point brightness of the liquid crystal panel 100 when the angle between the slow axis direction of the compensation film and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, the center point brightness of the liquid crystal panel 100 according to the embodiment of the present invention is one quarter.
  • the sum of the compensation value Ro of the wave plate and the compensation value Ro of the compensation diaphragm increases from large to small, and then from small to large, and when the compensation value Ro of the quarter wave plate and the compensation value of the compensation diaphragm
  • the center point brightness is the smallest.
  • FIG. 5 is a graph showing a trend of a luminance of a center point of a liquid crystal panel at a wavelength of 650 nm of incident light with a compensation value Ro of a quarter-wave plate according to an embodiment of the present invention.
  • the center point brightness of the liquid crystal panel 100 is four quarters.
  • the compensation value Ro of a wave plate increases from large to small, then from small to large, and when the compensation value Ro of the quarter wave plate is about a quarter of the wavelength 650 nm (ie, a quarter wave)
  • the compensation value Ro of the sheet is about 162.5 nm
  • the brightness of the center point of the liquid crystal panel 100 is the smallest.
  • the center point brightness of the liquid crystal panel 100 when the angle between the slow axis direction of the compensation film and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, the center point brightness of the liquid crystal panel 100 according to the embodiment of the present invention is one quarter.
  • the sum of the compensation value Ro of the wave plate and the compensation value Ro of the compensation diaphragm increases from large to small, and then from small to large, and when the compensation value Ro of the quarter wave plate and the compensation value of the compensation diaphragm
  • the center point brightness is the smallest.
  • the compensation value Ro of the quarter-wave plate is the sum of the compensation values Ro of the first quarter-wave plate 130a and the second quarter-wave plate 130b.
  • the compensation value Ro of the compensation diaphragm is the sum of the compensation values Ro of the first compensation diaphragm 140a and the second compensation diaphragm 140b.
  • FIG. 6 is a graph showing the relationship between the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm and the wavelength of visible light according to an embodiment of the present invention.
  • the sum of the ordinates Ro represents the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm
  • the abscissa wavelength represents the wavelength of visible light.
  • the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm is one quarter of the wavelength of the corresponding visible light.
  • Table 4 shows simulation results of dark state brightness, bright state brightness, and contrast of the liquid crystal panel in the normally black mode according to an embodiment of the present invention.
  • the angle between the optical axis of the quarter wave plate and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, which compensates for the slowness of the diaphragm.
  • the angle between the axial direction and the absorption axis direction of the polarizer is 45 degrees or 135 degrees, and the sum of the compensation value Ro of the quarter-wave plate and the compensation value Ro of the compensation diaphragm is one quarter of the wavelength of the corresponding visible light. .
  • the liquid crystal panel 100 according to the embodiment of the present invention effectively reduces the dark state brightness while reducing the brightness of the bright state, and the contrast is effectively improved.
  • the contrast of the liquid crystal panel 100 of the embodiment (the value is 1718) is equivalent to the contrast of the liquid crystal panel having the conventional structure in Table 1 (the value is 1720).
  • FIG. 7 shows a schematic diagram of a liquid crystal display according to an embodiment of the present invention.
  • a liquid crystal display according to an embodiment of the present invention includes a liquid crystal panel 100 and a backlight module 200 disposed oppositely.
  • the backlight module 200 provides a uniform surface light source to the liquid crystal panel 100, wherein the liquid crystal panel 100 is as shown in FIG. 2a or 2b.
  • the LCD panel is shown.
  • the liquid crystal panel according to the embodiment of the present invention can realize the normally black mode when the two polarizers are aligned in parallel and without applying a voltage, and the contrast thereof is effectively improved.

Landscapes

  • 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（100），其包括：相对设置的第一偏光片（120a）和第二偏光片（120b）；设置于所述第一偏光片（120a）和所述第二偏光片（120b）之间的液晶盒（110）；设置于所述第一偏光片（120a）与所述液晶盒（110）之间的第一四分之一波片（130a）；以及设置于所述第二偏光片（120b）与所述液晶盒（110）之间的第二四分之一波片（130b）；其中，所述第一偏光片（120a）的吸收轴方向与所述第二偏光片（120b）的吸收轴方向一致，所述第一四分之一波片（130a）的光轴方向与所述第二四分之一波片（130b）的光轴方向一致。液晶面板（100）在两个偏光片（120a、120b）平行偏贴并且不加电压时也能实现常黑模式，而且其对比度得到有效地提高。

Description

液晶面板及具有该液晶面板的液晶显示器 技术领域
本发明属于液晶显示技术领域，具体地讲，涉及一种液晶面板及具有该液晶面板的液晶显示器。
背景技术
随着光电与半导体技术的演进，也带动了平板显示器(Flat Panel Display)的蓬勃发展，而在诸多平板显示器中，液晶显示器(Liquid Crystal Display，简称LCD)因具有高空间利用效率、低消耗功率、无辐射以及低电磁干扰等诸多优越特性，已被应用于生产生活的各个方面。
液晶显示器通常包括相对设置的液晶面板和背光模块，其中，由于液晶面板无法发光，因此需要背光模块向液晶面板提供均匀的面光源，以使液晶面板显示影像。
在液晶面板中，如果没有偏光片的偏光作用，液晶面板就不能正常地显示画面。偏光片吸收方向与偏光轴垂直的光，只让沿着偏光轴方向的光透过，这样可把自然光转变成线偏振光。
VA(Vertical Alignment)显示模式即垂直取向模式，是指液晶分子与基板垂直取向的显示模式。VA显示模式以其宽视角、高对比度和无须摩擦配向等优势，成为大尺寸的液晶面板常采用的显示模式。
当不加电压时，入射光通过具有VA显示模式的液晶面板后不会发生偏转，所以在不加电压时设置于液晶面板的液晶显示单元外侧的上下偏光片垂直偏贴(即上下偏光片的吸收轴垂直)或者平行偏贴(即上下偏光片的吸收轴平行)决定液晶面板的常黑模式或常白模式。如图1a、图1b所示，通常上下偏光片平行偏贴时为常白模式：上下偏光片垂直偏贴时为常黑模式。
一般来讲，VA显示模式在不加电压的情况下采用常黑模式，即上下偏光 片垂直偏贴。这样在暗态下亮度很低，能够实现高对比度，而且在像素受损时呈暗态，表现为一个暗点，对画面的显示影响较小。
但是在生产大尺寸液晶面板的过程中，当液晶面板超过偏光片卷材的幅宽时，偏光片卷材不能裁切成同样尺寸且吸收轴垂直的偏光片。所以超过偏光片幅宽的大尺寸液晶面板按照现有的架构已经不能正常实现常黑模式。
当然，我们可以采用偏光片拼接的方式来实现上下偏光片垂直偏贴，但是在拼接处会有亮线产生，这在液晶面板生产制造中是不可接受的现象。
发明内容
为了解决上述现有技术的问题，本发明提供了一种上下偏光片平行偏贴的液晶面板及具有该液晶面板的液晶显示器。
根据本发明的一方面，提供了一种液晶面板，其包括：相对设置的第一偏光片和第二偏光片；设置于所述第一偏光片和所述第二偏光片之间的液晶盒；设置于所述第一偏光片与所述液晶盒之间的第一四分之一波片；以及设置于所述第二偏光片与所述液晶盒之间的第二四分之一波片；其中，所述第一偏光片的吸收轴方向与所述第二偏光片的吸收轴方向一致，所述第一四分之一波片的光轴方向与所述第二四分之一波片的光轴方向一致。
进一步地，所述第一偏光片的吸收轴方向与所述第一四分之一波片的光轴方向的夹角为45度或135度。
进一步地，当所述第一偏光片的吸收轴方向为0度时，所述第一四分之一波片的光轴方向为45度或135度。
进一步地，当所述第一偏光片的吸收轴方向为90度时，所述第一四分之一波片的光轴方向为45度或135度。
进一步地，所述液晶面板还包括：设置于所述第一四分之一波片和所述液晶盒之间的第一补偿膜片；以及设置于所述第二四分之一波片和所述液晶盒之间的第二补偿膜片；其中，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。或者，所述液晶面板还包括：设置于所述第一四分之一波片和 所述第一偏光片之间的第一补偿膜片；以及设置于所述第二四分之一波片和所述第一偏光片之间的第二补偿膜片；其中，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。
进一步地，当所述第一偏光片的吸收轴方向为0度时，所述第一四分之一波片的光轴方向和所述第一补偿膜片的慢轴方向均为45度或135度。
进一步地，当所述第一偏光片的吸收轴方向为90度时，所述第一四分之一波片的光轴方向和所述第一补偿膜片的慢轴方向均为45度或135度。
进一步地，所述液晶面板还包括：设置于所述第一偏光片的背向所述液晶盒的表面上的第一保护膜片；设置于所述第二偏光片的背向所述液晶盒的表面上的第二保护膜片；设置于所述第一补偿膜片与所述液晶盒之间的第一压敏胶层；以及设置于所述第二补偿膜片与所述液晶盒之间的第二压敏胶层。或者，所述液晶面板还包括：设置于所述第一偏光片的背向所述液晶盒的表面上的第一保护膜片；设置于所述第二偏光片的背向所述液晶盒的表面上的第二保护膜片；设置于所述第一四分之一波片与所述液晶盒之间的第一压敏胶层；以及设置于所述第二四分之一波片与所述液晶盒之间的第二压敏胶层。
进一步地，所述第一四分之一波长的补偿值、所述第二四分之一波长的补偿值、所述第一补偿膜片的补偿值以及所述第二补偿膜片的补偿值之和等于入射光的波长的四分之一。
根据本发明的另一方面，还提供了一种液晶显示器，包括相对设置的液晶面板和背光模块，所述背光模块提供显示光源给所述液晶面板，所述液晶面板为上述的液晶面板。
本发明的有益效果：本发明的液晶面板在两个偏光片平行偏贴并且不加电压时也能实现常黑模式，而且其对比度得到有效地提高。
附图说明
通过参照附图对示例性实施例进行的详细描述，上述和其他特点及优点将会变得更加明显，附图中：
图1a示出了现有的液晶面板的常黑模式的架构图；
图1b示出了现有的液晶面板的常白模式的架构图；
图2a示出了根据本发明的实施例的液晶面板在不加电压时实现常黑模式的架构图；
图2b示出了根据本发明的另一实施例的液晶面板在不加电压时实现常黑模式的架构图；
图3示出了根据本发明的实施例的液晶面板在波长450nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图；
图4示出了根据本发明的实施例的液晶面板在波长550nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图；
图5示出了根据本发明的实施例的液晶面板在波长650nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图；
图6示出了根据本发明的实施例的四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和与可见光波长的关系图；
图7示出了根据本发明的实施例的液晶显示器的示意图。
具体实施方式
以下，将参照附图来详细地描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的实施例。相反，提供这些实施例使得本发明将会彻底和完整，并可完全地将本发明的范围传达给本领域的技术人员。
在附图中，为了清楚元件，可以夸大元件的形状和尺寸，并且相同的标号将始终被用于表示相同的元件。
图2a示出了根据本发明的实施例的液晶面板在不加电压时实现常黑模式的架构图。
参照图2a，根据本发明的实施例的液晶面板100包括：液晶盒110、第一偏光片120a和第二偏光片120b、第一四分之一波片130a和第二四分之一波片130b、第一补偿膜片140a和第二补偿膜片140b、第一保护膜片150a和第二保护膜片150b、第一压敏胶层160a和第二压敏胶层160b。
具体而言，第一偏光片120a和第二偏光片120b相对设置，液晶盒110夹设于第一偏光片120a和第二偏光片120b之间。这里，液晶盒110包括对盒的彩膜基板和阵列基板，以及夹设于彩膜基板和阵列基板之间的液晶层。液晶盒110具有VA(Vertical Alignment)显示模式，并包含有若干液晶分子。
第一四分之一波片130a设置于第一偏光片120a和液晶盒110之间，而第二四分之一波片130b设置于第二偏光片120b和液晶盒110之间。这里，第一偏光片120a的吸收轴(或称吸光轴)方向和第二偏光片120b的吸收轴(或称吸光轴)方向一致，且第一四分之一波片130a的光轴方向和第二四分之一波片130b的光轴方向一致，且第一偏光片120a的吸收轴方向和第一四分之一波片130a的光轴方向的夹角为45度或135度。
作为本发明的一实施方式，第一偏光片120a的吸收轴方向和第二偏光片120b的吸收轴方向都可以为0度，这时，第一四分之一波片130a的光轴方向和第二四分之一波片130b的光轴方向都可以为45度或135度。
作为本发明的另一实施方式，第一偏光片120a的吸收轴方向和第二偏光片120b的吸收轴方向都可以为90度，这时，第一四分之一波片130a的光轴方向和第二四分之一波片130b的光轴方向都可以为45度或135度。
为了补偿液晶面板100在大视角下的漏光和色偏，进一步地，将第一补偿膜片140a设置于第一四分之一波片130a和液晶盒110之间，且将第二补偿膜片140b设置于第二四分之一波片130b和液晶盒110之间。也就是说，本发明的液晶面板100可以不需要设置第一补偿膜片140a和第二补偿膜片140b。另外，需要说明的是，第一补偿膜片140a和第二补偿膜片140b还能够起到隔绝水汽以及支撑偏光片的作用。
第一补偿膜片140a的慢轴方向和第二补偿膜片140b的慢轴方向一致，且第一补偿膜片140a的慢轴方向和第一四分之一波片130a的光轴方向一致。
作为本发明的一实施方式，第一偏光片120a的吸收轴方向和第二偏光片120b的吸收轴方向都可以为0度，这时，第一四分之一波片130a的光轴方向、第二四分之一波片130b的光轴方向、第一补偿膜片140a的慢轴方向和第二补偿膜片140b的慢轴方向都可以为45度或135度。
作为本发明的另一实施方式，第一偏光片120a的吸收轴方向和第二偏光片120b的吸收轴方向都可以为90度，这时，第一四分之一波片130a的光轴方向、第二四分之一波片130b的光轴方向、第一补偿膜片140a的慢轴方向和第二补偿膜片140b的慢轴方向都可以为45度或135度。
为了对第一偏光片120a和第二偏光片120b进行保护，将第一保护膜片150a设置于第一偏光片120a的背向液晶盒110的表面上，且将第二保护膜片150b设置于第二偏光片120b的背向液晶盒110的表面上。也就是说，本发明的液晶面板100可以不需要设置第一保护膜片150a和第二保护膜片150b。另外，需要说明的是，第一保护膜片150a和第二保护膜片150b还能够起到隔绝水汽以及支撑偏光片的作用。
将第一压敏胶层160a设置于第一补偿膜片140a和液晶盒110之间，且将第二压敏胶层160b设置于第二补偿膜片140b和液晶盒110之间。需要说明的是，当第一补偿膜片140a和第二补偿膜片140b本身具有粘性功能时，可将第一压敏胶层160a和第二压敏胶层160b省去。
图2b示出了根据本发明的另一实施例的液晶面板在不加电压时实现常黑模式的架构图。
参照图2b，与图2a所示的液晶面板的架构不同的是：将第一补偿膜片140a设置于第一四分之一波片130a和第一偏光片120a之间，且将第二补偿膜片140b设置于第二四分之一波片130b和第二偏光片120b之间。对应地，将第一压敏胶层160a设置于第一四分之一波片130a和液晶盒110之间，且将第二压敏胶层160b设置于第二四分之一波片130b和液晶盒110之间。
下面，将对如何获取根据本发明的实施例的液晶面板在不加电压时实现常黑模式进行详细地描述。
在本实施例中，采用LCD Master软件进行模拟。
模拟设定如下：
双轴(Biaxial)设定：慢轴与第一偏光片120a的吸收轴夹角为45度。
液晶设定：1、Pretilt angle＝89度；Pretilt angle为液晶在边界对垂直于液晶面板法向量的倾角；2、液晶面板100的每一像素区分为四畴，四畴(domain)液晶的轴向角分别为45度，135度，225度，315度。
光源设定：1、使用Blue-YAG LED的光谱；2、中央亮度定义为100nit；3、光源分布为朗伯特分布(Lambert`s distribution)。
在接下来的描述中，暗态亮度(单位：nit)指的是上述的液晶面板100在未加电压(0V)时的亮度；亮态亮度(单位：nit)指的是液晶面板100在加上电压(7V)时的亮度；对比度为亮态亮度与暗态亮度的比值。
表1示出了图1a所示的液晶面板在常黑模式时的暗态亮度、亮态亮度和对比度。
[表1]
0V 7V  
暗态亮度 亮态亮度 对比度
0.019966 34.348 1720
表2示出本实施例的四分之一波片(即第一四分之一波片130a和第二四分之一波片130b)分别在入射光波长450nm、550nm、650nm的各种参数。
[表2]
Figure PCTCN2016099496-appb-000001
Figure PCTCN2016099496-appb-000002
在表2中，Nx为四分之一波片在x轴的折射率；Ny为四分之一波片在y轴的折射率；Ro为四分之一波片在某一预设波长的补偿值，其可满足下面的式子(1)。
Ro＝(Nx-Ny)×d            (1)
从式(1)可以看出，通过调节四分之一波片的厚度d的大小或者折射率Nx、Ny的大小，则可以调节四分之一波片在某一预设波长的补偿值的大小。
表3示出根据本发明的实施例的液晶面板100在不加电压时实现常黑模式和在加电压时实现常白模式的模拟结果。其中，设定补偿膜片(即第一补偿膜片140a和第二补偿膜片140b)的慢轴方向分别与偏光片(即第一偏光片120a和第二偏光片120b)的吸收轴方向的夹角为90度。
[表3]
Figure PCTCN2016099496-appb-000003
从表3中可知，当四分之一波片的光轴方向与偏光片的吸收轴方向平行或垂直时，液晶面板100在不加电压时为亮态，呈现常白模式。当四分之一波片的光轴方向与偏光片的吸收轴方向的夹角为45度或135度时，液晶面板100在不加电压时为暗态，呈现常黑模式。然而，液晶面板100在不加电压时暗态亮度偏高，导致液晶面板100的对比度很低，其远低于表1中所示的1720。因此，需要重新设计合适的四分之一波片的参数来降低暗态亮度。
在下文中，将以入射光的波长450nm、550nm和650nm为例来对合适的四分之一波片的参数进行模拟，以使根据本发明的实施例的液晶面板100的对比度相当于表1中示出的具有现有架构的液晶面板的对比度。由于四分之一波片在某一预设波长的参数Nx及参数Ny为定值，因此，只能重新设计四分之一波片在该预设波长的补偿值Ro的大小来降低本发明的实施例的液晶面板的对比度，即改变四分之一波片的厚度d的大小。设计两种方案来对四分之一波片合适的补偿值Ro的大小进行模拟。
方案一：设定四分之一波片的光轴方向与偏光片的吸收轴方向的夹角为45度或135度，补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为90度，第一补偿膜片140a和第二补偿膜片140b的补偿值Ro均为28nm。
方案二：设定四分之一波片的光轴方向与偏光片的吸收轴方向的夹角为45度或135度，补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为45度或135度，第一补偿膜片140a和第二补偿膜片140b的补偿值Ro均为28nm。
在方案一和方案二中，改变四分之一波片的补偿值Ro的大小来模拟出本发明的实施例的液晶面板100的中心点亮度(单位：nit)的变化趋势。其中，液晶面板100的中心点亮度指的是正视该液晶面板100时的液晶面板100的中心处的亮度。
图3示出了根据本发明的实施例的液晶面板在入射光的波长450nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图。
参照图3，针对方案一：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为90度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro约为波长450nm的四分之一(即四分之一波片的补偿值Ro约为117.5nm)时，液晶面板100中心点亮度最小。
针对方案二：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为45度或135度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为波 长450nm的四分之一(即四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为117.5nm)时，中心点亮度最小。
图4示出了根据本发明的实施例的液晶面板在入射光的波长550nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图。
参照图4，针对方案一：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为90度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro约为波长550nm的四分之一(即四分之一波片的补偿值Ro约为137.5nm)时，液晶面板100中心点亮度最小。
针对方案二：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为45度或135度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为波长550nm的四分之一(即四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为137.5nm)时，中心点亮度最小。
图5示出了根据本发明的实施例的液晶面板在入射光的波长650nm的中心点亮度随四分之一波片的补偿值Ro的变化趋势图。
参照图5，针对方案一：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为90度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro约为波长650nm的四分之一(即四分之一波片的补偿值Ro约为162.5nm)时，液晶面板100中心点亮度最小。
针对方案二：当补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为45度或135度时，根据本发明的实施例的液晶面板100的中心点亮度随着四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和的增大而由大变小，再由小变大，并且当四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为波长650nm的四分之一(即四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和约为162.5nm)时，中心点亮度最小。
应当说明的是，在上述方案一和方案二中，四分之一波片的补偿值Ro为第一四分之一波片130a和第二四分之一波片130b的补偿值Ro之和，补偿膜片的补偿值Ro为第一补偿膜片140a和第二补偿膜片140b的补偿值Ro之和。
由上述的模拟结果可知，关于入射光的波长450nm、550nm和650nm的方案一、方案二的结论可拓展到整个可见光波段(即波长为380nm～780nm的光)。
作为一种优选，我们给出了四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和与可见光波长的关系。
图6示出了根据本发明的实施例的四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和与可见光波长的关系图。
参照图6，纵坐标Ro之和表示四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和，横坐标波长表示可见光的波长。由图6可知，四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和为对应的可见光的波长的四分之一。
表4示出了根据本发明的实施例的液晶面板在常黑模式时的暗态亮度、亮态亮度和对比度的模拟结果。优选地，表4中的根据本发明的实施例的液晶面板100，其四分之一波片光轴方向与偏光片的吸收轴方向的夹角为45度或135度，补偿膜片的慢轴方向与偏光片的吸收轴方向的夹角为45度或135度，四分之一波片的补偿值Ro与补偿膜片的补偿值Ro之和为对应的可见光的波长的四分之一。
[表4]
0V LV 7V LV  
暗态亮度 亮态亮度 对比度
0.02002 34.404 1718
从表4中可知，根据本发明的实施例的液晶面板100在不会降低亮态亮度的同时，有效地降低了暗态亮度，并且对比度得到有效地提高。根据本发明的 实施例的液晶面板100的对比度(其值为1718)与表1中的具有现有架构的液晶面板的对比度(其值为1720)相当。
图7示出了根据本发明的实施例的液晶显示器的示意图。
参照图7，根据本发明的实施例的液晶显示器包括相对设置的液晶面板100和背光模块200，背光模块200提供均匀的面光源给液晶面板100，其中，液晶面板100为图2a或图2b所示的液晶面板。
综上所述，根据本发明的实施例的液晶面板在两个偏光片平行偏贴并且不加电压时也能实现常黑模式，而且其对比度得到有效地提高。
虽然已经参照本发明的示例性实施例具体示出并描述了本发明，但是本领域普通技术人员将理解，在不脱离由权利要求限定的本发明的精神和范围的情况下，可以在这里做出形式和细节上的各种修改。

Claims (13)

  1. 一种液晶面板，其中，包括：
    相对设置的第一偏光片和第二偏光片；
    设置于所述第一偏光片和所述第二偏光片之间的液晶盒；
    设置于所述第一偏光片与所述液晶盒之间的第一四分之一波片；以及
    设置于所述第二偏光片与所述液晶盒之间的第二四分之一波片；
    其中，所述第一偏光片的吸收轴方向与所述第二偏光片的吸收轴方向一致，所述第一四分之一波片的光轴方向与所述第二四分之一波片的光轴方向一致。
  2. 根据权利要求1所述的液晶面板，其中，所述第一偏光片的吸收轴方向与所述第一四分之一波片的光轴方向的夹角为45度或135度。
  3. 根据权利要求2所述的液晶面板，其中，所述第一偏光片的吸收轴方向为0度或90度，所述第一四分之一波片的光轴方向为45度或135度。
  4. 根据权利要求2所述的液晶面板，其中，所述液晶面板还包括：
    设置于所述第一四分之一波片和所述液晶盒之间的第一补偿膜片；以及
    设置于所述第二四分之一波片和所述液晶盒之间的第二补偿膜片；
    其中，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。
  5. 根据权利要求2所述的液晶面板，其中，所述液晶面板还包括：
    设置于所述第一四分之一波片和所述第一偏光片之间的第一补偿膜片；以及设置于所述第二四分之一波片和所述第一偏光片之间的第二补偿膜片；
    其中，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。
  6. 根据权利要求4所述的液晶面板，其中，当所述第一偏光片的吸收轴方向为0度或90度时，所述第一四分之一波片的光轴方向和所述第一补偿膜片的慢轴方向均为45度或135度。
  7. 根据权利要求5所述的液晶面板，其中，当所述第一偏光片的吸收轴方向为0度或90度时，所述第一四分之一波片的光轴方向和所述第一补偿膜片的慢轴方向均为45度或135度。
  8. 根据权利要求6所述的液晶面板，其中，所述第一四分之一波长的补偿值、所述第二四分之一波长的补偿值、所述第一补偿膜片的补偿值以及所述第二补偿膜片的补偿值之和等于入射光的波长的四分之一。
  9. 根据权利要求7所述的液晶面板，其中，所述第一四分之一波长的补偿值、所述第二四分之一波长的补偿值、所述第一补偿膜片的补偿值以及所述第二补偿膜片的补偿值之和等于入射光的波长的四分之一。
  10. 根据权利要求4所述的液晶面板，其中，所述液晶面板还包括：
    设置于所述第一偏光片的背向所述液晶盒的表面上的第一保护膜片；
    设置于所述第二偏光片的背向所述液晶盒的表面上的第二保护膜片；
    设置于所述第一补偿膜片与所述液晶盒之间的第一压敏胶层；以及
    设置于所述第二补偿膜片与所述液晶盒之间的第二压敏胶层。
  11. 根据权利要求5所述的液晶面板，其中，所述液晶面板还包括：
    设置于所述第一偏光片的背向所述液晶盒的表面上的第一保护膜片；
    设置于所述第二偏光片的背向所述液晶盒的表面上的第二保护膜片；
    设置于所述第一四分之一波片与所述液晶盒之间的第一压敏胶层；以及
    设置于所述第二四分之一波片与所述液晶盒之间的第二压敏胶层。
  12. 一种液晶显示器，包括相对设置的液晶面板和背光模块，所述背光模块提供显示光源给所述液晶面板，其中，所述液晶面板包括：
    相对设置的第一偏光片和第二偏光片；
    设置于所述第一偏光片和所述第二偏光片之间的液晶盒；
    设置于所述第一偏光片与所述液晶盒之间的第一四分之一波片；
    设置于所述第二偏光片与所述液晶盒之间的第二四分之一波片；
    设置于所述第一四分之一波片和所述液晶盒之间的第一补偿膜片；以及
    设置于所述第二四分之一波片和所述液晶盒之间的第二补偿膜片；
    其中，所述第一偏光片的吸收轴方向与所述第二偏光片的吸收轴方向一致，所述第一四分之一波片的光轴方向与所述第二四分之一波片的光轴方向一致，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。
  13. 一种液晶显示器，包括相对设置的液晶面板和背光模块，所述背光模块提供显示光源给所述液晶面板，其中，所述液晶面板包括：
    相对设置的第一偏光片和第二偏光片；
    设置于所述第一偏光片和所述第二偏光片之间的液晶盒；
    设置于所述第一偏光片与所述液晶盒之间的第一四分之一波片；
    设置于所述第二偏光片与所述液晶盒之间的第二四分之一波片；
    设置于所述第一四分之一波片和所述第一偏光片之间的第一补偿膜片；以及
    设置于所述第二四分之一波片和所述第一偏光片之间的第二补偿膜片；
    其中，所述第一偏光片的吸收轴方向与所述第二偏光片的吸收轴方向一 致，所述第一四分之一波片的光轴方向与所述第二四分之一波片的光轴方向一致，所述第一补偿膜片的慢轴方向和所述第二补偿膜片的慢轴方向一致，且所述第一补偿膜片的慢轴方向和所述第一四分之一波片的光轴方向一致。
PCT/CN2016/099496 2016-08-19 2016-09-20 液晶面板及具有该液晶面板的液晶显示器 Ceased WO2018032572A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/311,507 US10295864B2 (en) 2016-08-19 2016-09-20 Liquid crystal panel and liquid crystal display with the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610695871.9 2016-08-19
CN201610695871.9A CN106094348B (zh) 2016-08-19 2016-08-19 液晶面板及具有该液晶面板的液晶显示器

Publications (1)

Publication Number Publication Date
WO2018032572A1 true WO2018032572A1 (zh) 2018-02-22

Family

ID=58069893

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/099496 Ceased WO2018032572A1 (zh) 2016-08-19 2016-09-20 液晶面板及具有该液晶面板的液晶显示器

Country Status (3)

Country Link
US (1) US10295864B2 (zh)
CN (1) CN106094348B (zh)
WO (1) WO2018032572A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108508646A (zh) * 2018-03-23 2018-09-07 惠州市华星光电技术有限公司 一种液晶显示装置
CN110609411B (zh) * 2019-09-26 2022-05-24 京东方科技集团股份有限公司 液晶显示面板和显示装置
CN111367102A (zh) * 2020-05-08 2020-07-03 康惠（惠州）半导体有限公司 一种垂直取向液晶光阀镜片组件
CN111722422B (zh) * 2020-06-10 2023-05-02 深圳市华星光电半导体显示技术有限公司 一种液晶面板的检测方法和液晶面板
CN111812881A (zh) * 2020-07-02 2020-10-23 惠州市华星光电技术有限公司 一种偏光片、显示面板及电子设备
JP7651958B2 (ja) * 2021-05-31 2025-03-27 セイコーエプソン株式会社 電気光学装置、電子機器、およびプロジェクター

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1629701A (zh) * 2003-11-26 2005-06-22 E.I.内穆尔杜邦公司 用于显示器的防窥视屏幕
CN101086586A (zh) * 2006-06-07 2007-12-12 统宝光电股份有限公司 影像显示系统
CN101256300A (zh) * 2007-02-26 2008-09-03 统宝光电股份有限公司 影像显示系统
CN101273292A (zh) * 2005-09-14 2008-09-24 日东电工株式会社 附有光学补偿层的偏光板、使用附有光学补偿层的偏光板的液晶面板、和图像显示装置
US20080273151A1 (en) * 2007-05-04 2008-11-06 Industrial Technology Research Institute Low color shift optical film and liquid crystal display containing the same
CN102830540A (zh) * 2012-09-07 2012-12-19 京东方科技集团股份有限公司 蓝相液晶显示面板及应用其的液晶显示器
CN105259708A (zh) * 2015-11-20 2016-01-20 武汉华星光电技术有限公司 透明显示器
CN105320314A (zh) * 2014-06-04 2016-02-10 宸盛光电有限公司 触控显示装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2259131B1 (en) * 2008-04-07 2012-06-20 Sharp Kabushiki Kaisha Liquid crystal display
KR20160092150A (ko) * 2015-01-26 2016-08-04 삼성디스플레이 주식회사 표시 장치 및 표시장치의 구동 방법

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1629701A (zh) * 2003-11-26 2005-06-22 E.I.内穆尔杜邦公司 用于显示器的防窥视屏幕
CN101273292A (zh) * 2005-09-14 2008-09-24 日东电工株式会社 附有光学补偿层的偏光板、使用附有光学补偿层的偏光板的液晶面板、和图像显示装置
CN101086586A (zh) * 2006-06-07 2007-12-12 统宝光电股份有限公司 影像显示系统
CN101256300A (zh) * 2007-02-26 2008-09-03 统宝光电股份有限公司 影像显示系统
US20080273151A1 (en) * 2007-05-04 2008-11-06 Industrial Technology Research Institute Low color shift optical film and liquid crystal display containing the same
CN102830540A (zh) * 2012-09-07 2012-12-19 京东方科技集团股份有限公司 蓝相液晶显示面板及应用其的液晶显示器
CN105320314A (zh) * 2014-06-04 2016-02-10 宸盛光电有限公司 触控显示装置
CN105259708A (zh) * 2015-11-20 2016-01-20 武汉华星光电技术有限公司 透明显示器

Also Published As

Publication number Publication date
CN106094348A (zh) 2016-11-09
CN106094348B (zh) 2019-05-03
US20180180919A1 (en) 2018-06-28
US10295864B2 (en) 2019-05-21

Similar Documents

Publication Publication Date Title
WO2018032572A1 (zh) 液晶面板及具有该液晶面板的液晶显示器
US10126477B2 (en) Optical compensation film and method for manufacturing the same, polarizer, liquid crystal display panel and display device
US9632360B2 (en) Liquid crystal panel and liquid crystal display
JP6266769B2 (ja) 液晶ディスプレイの光学補償方法
CN111201483B (zh) 液晶显示装置
CN109445193A (zh) 一种水平电场型的显示面板、其制作方法及显示装置
CN102854661A (zh) Va显示模式补偿架构及va显示模式液晶显示装置
WO2015149377A1 (zh) 用于液晶面板的双层双轴补偿架构及液晶显示装置
US20160334662A1 (en) Liquid crystal panel compensation structure and liquid crystal display apparatus
WO2016101338A1 (zh) 液晶显示器
WO2016101339A1 (zh) 液晶显示器
WO2022000694A1 (zh) 显示装置及电子设备
CN104317104A (zh) 液晶面板补偿架构及液晶显示装置
CN103869534B (zh) 用于液晶面板的单层双轴补偿架构及液晶显示装置
US20200073176A1 (en) Liquid crystal display device
US9977295B2 (en) Display substrate and manufacturing method thereof, display device
CN103076695A (zh) 一种液晶显示装置及其偏光片设置方法
CN103033986A (zh) 用于液晶面板的补偿系统及液晶显示装置
US20160246096A1 (en) Liquid crystal panel compensation structure and liquid crystal display apparatus
CN108508646A (zh) 一种液晶显示装置
US20150286099A1 (en) Compensation Architecture of Liquid Crystal Panel and Liquid Crystal Display Device
CN105334670A (zh) 液晶面板补偿架构及其光学补偿方法
JP5316270B2 (ja) 液晶表示装置
CN103869538A (zh) 液晶面板的补偿架构及液晶显示装置
CN101738786A (zh) 液晶面板

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 15311507

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16913327

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16913327

Country of ref document: EP

Kind code of ref document: A1