WO2016172857A1 - 一种多畴垂直取向液晶屏及其制造方法 - Google Patents

一种多畴垂直取向液晶屏及其制造方法 Download PDF

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Publication number
WO2016172857A1
WO2016172857A1 PCT/CN2015/077703 CN2015077703W WO2016172857A1 WO 2016172857 A1 WO2016172857 A1 WO 2016172857A1 CN 2015077703 W CN2015077703 W CN 2015077703W WO 2016172857 A1 WO2016172857 A1 WO 2016172857A1
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Prior art keywords
panel
liquid crystal
protrusion
groove
slope
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PCT/CN2015/077703
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English (en)
French (fr)
Inventor
梁艳峰
谢亮
刘晨
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15890237.9A priority Critical patent/EP3282313A4/en
Priority to CN201580073586.7A priority patent/CN107209430A/zh
Priority to PCT/CN2015/077703 priority patent/WO2016172857A1/zh
Priority to US15/570,105 priority patent/US20180136506A1/en
Publication of WO2016172857A1 publication Critical patent/WO2016172857A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • 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
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • 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 
    • G02F1/03—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0305—Constructional arrangements
    • G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • 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
    • G02F1/1343—Electrodes
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133761—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different pretilt angles

Definitions

  • the present invention relates to the field of electronic technology, and in particular to a multi-domain vertical alignment liquid crystal panel and a method of fabricating the same.
  • a multi-domain vertical alignment (MVA) mode liquid crystal screen In a multi-domain vertical alignment (MVA) mode liquid crystal screen, the long axis of the liquid crystal molecules is not parallel to the screen as in the TN mode when unpowered, but perpendicular to the screen, and each primitive is It consists of a plurality of such vertically oriented liquid crystal molecular domains.
  • VMA multi-domain vertical alignment
  • this is a typical MVA liquid crystal screen in which the liquid crystal molecules are arranged.
  • the long axis of the liquid crystal molecules is perpendicular to the liquid crystal screen.
  • the panel once energized, the liquid crystal molecules under the action of an electric field, the long axis will become perpendicular to the triangular prism.
  • the upper and lower panels of the liquid crystal panel are two polarizing plates whose transmission axes are perpendicular to each other.
  • the liquid crystal molecules of the MVA liquid crystal panel are perpendicular to the panel, and the light emitted by the backlight cannot pass through the two panels, thus the screen In the dark state; once energized, the long axis of the liquid crystal molecules is at an angle to the panel, and the optical rotation of the liquid crystal causes the linear polarization plane of the lower panel to rotate, so that the screen can be bright through the upper panel.
  • FIG. 1 shows a typical dual domain structure. If the projection shape of the triangular prism on the panel is designed to be a fold line shape, as shown in FIG. 2, it becomes a four-domain structure, and as shown by the arrow in the figure, the liquid crystal molecules are divided into four different orientations by the fold-shaped protrusions. . Of course, more domains can be designed.
  • the inventors have found that in the conventional MVA liquid crystal panel, due to the sharpness of the aforementioned protrusions, the orientation of the liquid crystal molecules at the sharp points is disordered, and even if there is no current, the light of the backlight may pass, so-called so-called The phenomenon of "light leakage".
  • a multi-domain vertical alignment liquid crystal screen comprising:
  • first panel and a second panel a first panel and a second panel, the first panel is parallel to the second panel, and the first panel and the second panel are filled with liquid crystal, and the first panel and the second panel are both Transparent;
  • the outer sides of the first panel and the second panel respectively cover the first polarizing plate and the second polarizing plate, and the transmission axes of the first polarizing plate and the second polarizing plate are perpendicular to each other;
  • the second panel is provided with at least one first groove, and the slope of the first groove is smoothly connected with other portions of the second panel and the bottom of the first groove.
  • At least one pixel area is segmented on the second panel, and the first trench is parallel to a boundary of the pixel area in the pixel area.
  • At least one pixel area is segmented on the second panel, and in the pixel area +, the first trench is in a zigzag shape.
  • the corners of the polygonal line are in a smooth connection.
  • At least one second trench is disposed on the first panel, and a slope of the second trench is smoothly connected with other portions of the first panel and a bottom of the first trench.
  • first trench and the second trench are offset from each other and are parallel to each other.
  • the first panel is provided with at least one protrusion, the top of the protrusion is in a smooth shape, and the top of the protrusion is smoothly connected with the slope of the protrusion, the slope of the protrusion and the first panel The other parts of the sleek connection.
  • the first groove and the protrusion are dislocated and disposed parallel to each other.
  • a multi-domain vertical alignment liquid crystal panel comprising:
  • first panel and a second panel a first panel and a second panel, the first panel is parallel to the second panel, and the first panel and the second panel are filled with liquid crystal, and the first panel and the second panel are both Transparent;
  • the outer sides of the first panel and the second panel respectively cover the first polarizing plate and the second polarizing plate, and the transmission axes of the first polarizing plate and the second polarizing plate are perpendicular to each other;
  • the second panel is provided with at least one first protrusion, and the top of the first protrusion is light a sliding shape, a top of the first protrusion is smoothly connected to a slope of the first protrusion, and a slope of the first protrusion is smoothly connected with other portions of the first panel.
  • At least one pixel area is segmented on the second panel, and the first protrusion is parallel to a boundary of the pixel area in the pixel area.
  • At least one pixel area is segmented on the second panel, and in the pixel area, the first protrusion is a fold line shape.
  • the corners of the polygonal line are in a smooth connection.
  • At least one second protrusion is disposed on the first panel, a top of the second protrusion is a smooth shape, and a top of the second protrusion is smoothly connected with a slope of the second protrusion, the first The two raised slopes are smoothly connected to the other portions of the first panel.
  • first protrusion and the second protrusion are dislocated and are parallel to each other.
  • At least one trench is disposed on the first panel, and a slope of the trench is smoothly connected to other portions of the first panel and a bottom of the trench.
  • the first protrusions are offset from the grooves and are parallel to each other.
  • a method of manufacturing a liquid crystal panel comprising:
  • the mask is provided with stripes of light transmittance gradient
  • the mask is exposed.
  • the slope of the groove or the protrusion is smoothly connected with other portions of the panel, there is no sharp portion, and the long axis of the liquid crystal molecules is not disordered when the liquid crystal molecules are not energized, thereby effectively reducing light leakage. phenomenon.
  • FIG. 1 is a schematic structural view of a multi-domain vertical alignment liquid crystal panel in the prior art
  • FIG. 2 is a schematic view showing a fold line protrusion of a multi-domain vertical alignment liquid crystal panel in the prior art
  • FIG. 3 is a cross-sectional view of a multi-domain vertical alignment liquid crystal panel according to an embodiment of the present invention.
  • 4A is a schematic view showing a planar shape of a groove on a panel in an embodiment of the present invention.
  • 4B is a schematic view showing a planar shape of a groove on a panel in another embodiment of the present invention.
  • Figure 5 is a cross-sectional view of a multi-domain vertical alignment liquid crystal panel provided by an alternative embodiment of the present invention.
  • Figure 6A is a schematic view showing the planar shape of a protrusion on a panel in one embodiment of the present invention.
  • 6B is a schematic view showing a planar shape of a protrusion on a panel in another embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of a multi-domain vertical alignment liquid crystal panel according to still another embodiment of the present invention.
  • Figure 8 is a flow chart showing an embodiment of a method of manufacturing a liquid crystal panel of the present invention.
  • an embodiment of the present invention provides a multi-domain vertical alignment liquid crystal panel including a first panel 301, a second panel 302, and a liquid crystal 303.
  • the first panel 301 is parallel to the second panel 302, and the liquid crystal 303 is filled.
  • the liquid crystal 303 may be a liquid crystal material having a negative dielectric anisotropy and anisotropy.
  • the first panel 301 and the second panel 302 are made of a transparent material such as glass, plastic, or the like.
  • the outer sides of the first panel 301 and the second panel 302 respectively cover the first polarizing plate 3011 and the second polarizing plate 3021, and the transmission axes of the first polarizing plate 3011 and the second polarizing plate 3021 are perpendicular to each other.
  • a vertical alignment type alignment film may be attached on the inner side of the first panel and the second panel for guiding liquid crystal molecules to be aligned in a direction perpendicular to the first panel and the second panel without an applied electric field.
  • the second panel 302 may be provided with a black matrix 308 that prevents light from entering the non-pixel area, and the black matrix 308 divides at least one pixel area on the second panel 302.
  • the first panel 301 and the second panel 302 are respectively provided with a common electrode 304 and a pixel electrode 305, and at least one scan line 310 and a signal line 311 are disposed on the second panel.
  • a thin film transistor is disposed at the intersection of the data signal line 310 and the scanning signal line 311.
  • the thin film transistor is composed of a gate electrode 312, a source electrode 313 and a drain electrode 314, and the drain electrode 314 is electrically connected to the pixel electrode 305 through the contact hole 315.
  • the common electrode 304 is made of a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO) or the like.
  • the second panel 302 is provided with at least one groove 306, and the slope of the groove 306 is smoothly connected with other portions of the second panel 302 and the bottom of the groove 306.
  • smooth connection means that the connection of the slope to the other portions of the second panel 302 and the bottom of the trench 306 is differentiable.
  • the liquid crystal molecules have a long axis perpendicular to the first panel and the second panel when the electrodes 304, 305 are not energized. Of course, as is known to those skilled in the art, the liquid crystal molecules located at the groove position are affected by the groove friction, and the long axis thereof is inclined toward the groove slope.
  • the protrusion since the protrusion has a sharp portion, the orientation of the long axis of the liquid crystal molecules at the sharp point is disordered, resulting in light leakage when not energized.
  • the slope of the trench 306 is smoothly connected with other portions of the second panel 302 and the bottom of the trench 306, there is no sharp portion, and the long axis of the liquid crystal molecules does not point when not energized. Disorder, which effectively reduces light leakage.
  • the planar shape of the trench 306 on the second panel 302 can be various.
  • the groove 306 in one pixel region 401, is disposed in a line parallel to the boundary of the pixel region 401, so that a structure of a double domain can be formed.
  • the grooves 306 in one pixel region 401, are arranged in a zigzag shape, so that a four-domain structure can be formed.
  • the corners of the fold lines can be made smooth, that is, the corners of the fold line are microscopic, without sharp portions, thus further reducing the sharp portions.
  • the trenches 306 can also be arranged in other shapes, such as an "eight" shape that is symmetric about the centerline of the pixel region 401.
  • the groove 307 may be a conventional structure having a sharp corner, or may be a structure in which the slope of the groove is smoothly connected to the other portions of the first panel and the bottom of the groove as in the foregoing embodiment.
  • the grooves 306 are offset from the grooves 307, i.e., the position of the grooves 306 on the second panel 302 is offset from the position of the grooves 307 on the first panel 301.
  • the planar shape of the trench 307 on the first panel 301 may also be the same as the planar shape of the trench 306 in the corresponding pixel region, and arranged in parallel.
  • At least one protrusion 506 may also be disposed on the second panel 302.
  • the top of the protrusion 506 has a smooth shape, that is, no sharp point, such as an arc. Shape, platform shape, etc.
  • the top of the protrusion 506 is smoothly connected to the slope of the protrusion 506 while the slope of the protrusion 506 is also smoothly connected to other portions of the second panel 302.
  • smooth connection herein is meant that the slope of the protrusion 506 is connectable to the other portions of the second panel 302 and the top of the protrusion 506.
  • Other parts of the second panel 302 may be the same as the foregoing embodiments, and details are not described herein again.
  • the protrusion 506 may have a plurality of planar shapes on the second panel 302.
  • the protrusions 506 are disposed in a line parallel to the boundary of the pixel region 401, so that a structure of a double domain can be formed.
  • the protrusions 506 are arranged in a zigzag shape so that a four-domain structure can be formed.
  • the corners of the fold line can be made into a smooth connection. That is, the corner of the line is microscopic, without sharp portions, which further reduces the sharp portion.
  • the protrusions 506 can also be arranged in other shapes, for example, in an "eight" shape that is symmetrical about the centerline of the pixel region 401.
  • the protrusion 507 in addition to providing the protrusion 506 on the second panel 302, at least one protrusion 507 is also disposed on the first panel, and the structure of the protrusion 507 may be the same as or different from the protrusion 506. That is, the protrusion 507 may be a conventional structure having a sharp corner, or may be a structure in which the slope of the protrusion as in the foregoing embodiment is smoothly connected to the other portions of the first panel 301 and the top of the protrusion.
  • the protrusions 506 are offset from the protrusions 507, i.e., the position of the protrusions 506 on the second panel 302 is offset from the position of the protrusions 507 on the first panel 301.
  • the planar shape of the protrusions 507 on the first panel 301 may also be the same as the planar shape of the protrusions 506 in the corresponding pixel regions, and arranged in parallel.
  • a groove may be provided on one panel and a protrusion may be provided on the other panel, and the protrusion and the groove may be misaligned. Settings.
  • the slope of the trench 306 is continuously and smoothly connected with other portions of the second panel 302 and the bottom of the trench 306, there is no sharp portion, and the long axis of the liquid crystal molecules does not point when not energized. Disorder, which effectively reduces light leakage.
  • an embodiment of a method for manufacturing a liquid crystal panel provided by the present invention includes:
  • the panel is coated with a photosensitive layer
  • the panels herein may be made of a transparent material such as glass, plastic, etc.; the photosensitive layer may be of various materials that are sensitive to ultraviolet light or other wavelengths, such as acrylic or epoxy acrylic photopolymers. In one embodiment, the photosensitive layer has a thickness of 100 microns.
  • the above numerical values are all examples, and other values may be selected as needed, which is not limited by the embodiment of the present invention.
  • the shape of the stripe is the same as the planar shape of the groove 306 in the previous embodiment.
  • the light transmittance gradation means that the light transmittance at the stripe is continuously changed without jumping.
  • the light transmittance is highest at the stripes corresponding to the bottom of the trench, and the light transmittance corresponding to the grooveless region is the lowest, and the light transmittance continuously changes therebetween.
  • the light used to expose the mask is a wavelength band sensitive to the photosensitive layer.
  • the photosensitive layer is sensitive to ultraviolet light and is exposed to ultraviolet light.
  • the photosensitive layer on the panel is etched out of the trench by the light. Since the stripe transmittance on the mask is gradual, the slope of the trench will smoothly transition, and will not A sharp portion is formed to form a structure as described in the foregoing liquid crystal panel embodiment.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Liquid Crystal (AREA)

Abstract

一种多畴垂直取向液晶屏及其制造方法，包括：第一面板(301)和第二面板(302)，所述第一面板(301)平行于所述第二面板(302)，所述第一面板(301)和所述第二面板(302)之间填充有液晶(303)，所述第一面板(301)和所述第二面板(302)均透明；所述第一面板(301)和所述第二面板(302)的外侧分别覆盖第一偏振片(3011)和第二偏振片(3021)，所述第一偏振片(3011)和所述第二偏振片(3021)的透光轴互相垂直；所述第二面板(302)上设置有至少一个第一沟槽(306)，所述第一沟槽(306)的坡与所述第二面板(302)其他部分以及所述第一沟槽(306)的底部光滑连接。

Description

一种多畴垂直取向液晶屏及其制造方法 技术领域
本发明涉及电子技术领域，特别是涉及一种多畴垂直取向液晶屏及其制造方法。
背景技术
多畴垂直取向(Multi-domain Vertical Alignment，MVA)模式的液晶屏，其液晶分子长轴在未加电时不像TN模式那样平行於屏幕，而是垂直於屏幕，并且每个图元都是由多个这种垂直取向的液晶分子畴组成。当电压加到液晶上时，液晶分子便倒向不同的方向。这样从不同的角度观察萤幕都可以获得相应方向的补偿，也就改善了可视角度。
如图1所示，这是一个典型的MVA液晶屏中液晶分子排布，在液晶屏的上下面板上，有若干三角棱状的突起，在未通电时，液晶分子的长轴垂直于液晶屏面板，一旦通电，液晶分子在电场作用下，其长轴会变为垂直于三角棱状突起。众所周知，液晶屏的上下两块面板是透光轴互相垂直的两块偏振片，在不通电时，MVA液晶屏的液晶分子垂直于面板，背光源发出的光无法透过两块面板，因而屏幕呈暗态；而一旦通电，液晶分子的长轴与面板成一定角度，液晶的旋光作用使得通过下面板的线偏光偏振面发生旋转，从而可以通过上面板，屏幕因此而呈亮态。为了提高屏幕的可视角度和对比度，在上面板和下面板上都设有三角棱状的突起，两个突起之间的液晶分子倾斜方向相同，称为一个“畴”，不同畴的分子在通电后向不同方向倾斜，可以实现对不同方向的补偿。图1所示就是一种典型的双畴结构。如果把三角棱状突起在面板上的投影形状设计为折线形，如图2所示，就成为四畴结构，如图中箭头所示，液晶分子被折线形的突起分割成四种不同的取向。当然，也可以设计出更多的畴。
发明人在实现本发明的过程中发现，在现有的MVA液晶屏中，由于前述的突起部尖锐，导致尖锐处的液晶分子取向紊乱，即使没有通电也有可能使背光源的光通过，出现所谓的“漏光”现象。
发明内容
本发明的目的在于提供一种多畴垂直取向液晶屏及其制造方法，以减少屏幕漏光。
根据本发明的第一方面，一种多畴垂直取向液晶屏，包括：
第一面板和第二面板，所述第一面板平行于所述第二面板，所述第一面板和所述第二面板之间填充有液晶，所述第一面板和所述第二面板均透明；
所述第一面板和所述第二面板的外侧分别覆盖第一偏振片和第二偏振片，所述第一偏振片和所述第二偏振片的透光轴互相垂直；
所述第二面板上设置有至少一个第一沟槽，所述第一沟槽的坡与所述第二面板其他部分以及所述第一沟槽的底部光滑连接。
可选的，所述第二面板上分割出至少一个像素区域，在所述像素区域中所述第一沟槽平行于所述像素区域的边界。
可选的，所述第二面板上分割出至少一个像素区域，在所述像素区域+中，所述第一沟槽为折线形。
可选的，所述折线形的拐角处呈光滑连接。
可选的，在所述第一面板上设置至少一条第二沟槽，所述第二沟槽的坡与所述第一面板其他部分以及所述第一沟槽的底部光滑连接。
可选的，所述第一沟槽与所述第二沟槽错位设置，且互相平行。
可选的，所述第一面板上设置有至少一个突起，所述突起的顶部为光滑形状，所述突起的顶部与所述突起的坡光滑连接，所述突起的坡与所述第一面板的其他部分光滑连接。
可选的，所述第一沟槽与所述突起错位设置，且互相平行。
根据本发明的第二方面，一种多畴垂直取向液晶屏，包括：
第一面板和第二面板，所述第一面板平行于所述第二面板，所述第一面板和所述第二面板之间填充有液晶，所述第一面板和所述第二面板均透明；
所述第一面板和所述第二面板的外侧分别覆盖第一偏振片和第二偏振片，所述第一偏振片和所述第二偏振片的透光轴互相垂直；
所述第二面板上设置有至少一个第一突起，所述第一突起的顶部为光 滑形状，所述第一突起的顶部与所述第一突起的坡光滑连接，所述第一突起的坡与所述第一面板的其他部分光滑连接。
可选的，所述第二面板上分割出至少一个像素区域，在所述像素区域中所述第一突起平行于所述像素区域的边界。
可选的，所述第二面板上分割出至少一个像素区域，在所述像素区域中，所述第一突起为折线形。
可选的，所述折线形的拐角处呈光滑连接。
可选的，在所述第一面板上设置至少一条第二突起，所述第二突起的顶部为光滑形状，所述第二突起的顶部与所述第二突起的坡光滑连接，所述第二突起的坡与所述第一面板的其他部分光滑连接。
可选的，所述第一突起与所述第二突起错位设置，且互相平行。
可选的，所述第一面板上设置至少一条沟槽，所述沟槽的坡与所述第一面板其他部分以及所述沟槽的底部光滑连接。
可选的，所述第一突起与所述沟槽错位设置，且互相平行。
根据本发明的第三方面，一种液晶屏制造方法，包括：
准备一面板，所述面板上涂覆有光敏层；
在所述面板上放置掩模，所述掩模上设有透光率渐变的条纹；
对所述掩模曝光。
采用上述本发明各方面提供的技术方案，由于沟槽或突起的坡与面板其他部分光滑连接，不再有尖锐的部分，液晶分子在未通电时长轴指向不会紊乱，从而有效的减少了漏光现象。
附图说明
图1是现有技术中多畴垂直取向液晶屏的结构示意图；
图2是现有技术中一种多畴垂直取向液晶屏的折线形突起的示意图；
图3是本发明一个实施例提供的多畴垂直取向液晶屏的剖面图；
图4A是本发明一个实施例中沟槽在面板上的平面形状的示意图；
图4B是本发明另一个实施例中沟槽在面板上的平面形状的示意图；
图5是本发明一个替代实施例提供的多畴垂直取向液晶屏的剖面图；
图6A是本发明一个实施例中突起在面板上的平面形状的示意图；
图6B是本发明另一个实施例中突起在面板上的平面形状的示意图；
图7是本发明又一实施例提供的多畴垂直取向液晶屏的剖面图；
图8是本发明一个液晶屏制造方法实施例的流程图。
具体实施方式
如图3所示，本发明的一个实施例提供一种多畴垂直取向液晶屏，包括第一面板301、第二面板302、液晶303，第一面板301平行于第二面板302，液晶303填充于第一面板301和第二面板302之间。如本领域技术人员所知，液晶303可以为介电常数为负且各向异性的液晶材料。第一面板301和第二面板302为透明材质，如玻璃、塑料等。第一面板301和第二面板302的外侧分别覆盖第一偏振片3011和第二偏振片3021，第一偏振片3011和第二偏振片3021的透光轴互相垂直。在所述第一面板和第二面板的内侧，还可以附有垂直取向型配向膜，用于引导液晶分子在无外加电场的情况下沿垂直所述第一面板和第二面板的方向排列。第二面板302上可以设置有防止光线进入非像素区域的黑矩阵(Black Matrix)308，所述黑矩阵308在所述第二面板302上分割出至少一个像素区域。在一个实施例中，所述第一面板301和第二面板302上分别设置有公共电极304、像素电极305，在所述第二面板上设置有至少一条扫描线310和信号线311。数据信号线310和扫描信号线311的交叉处设置有薄膜晶体管，薄膜晶体管由栅电极312，源电极313和漏电极314组成，漏电极314通过接触孔315与像素电极305电气连接，像素电极305、公共电极304均采用透明导电材料制成，如氧化铟锡(ITO)、氧化铟锌(IZO)等。所述第二面板302上设置有至少一个沟槽306，所述沟槽306的坡与第二面板302其他部分以及沟槽306的底部光滑连接。这里所说的“光滑连接”，意指该坡与第二面板302的其他部分以及沟槽306的底部的连接部是可微的。液晶分子在电极304、305未通电时长轴垂直于第一面板和第二面板。当然，如本领域技术人员所知，在未通电状态下，位于沟槽位置的液晶分子，受沟槽摩擦力影响，其长轴会向沟槽斜坡倾斜。在现有技术中，由于突起上有尖锐的部分，因此液晶分子在该尖锐处长轴的指向紊乱，导致未通电时漏光。而采用上述本发明实施例的技术方案，由于沟槽306的坡与第二面板302其他部分以及沟槽306的底部光滑连接，不再有尖锐的部分，液晶分子在未通电时长轴指向不会 紊乱，从而有效的减少了漏光现象。
如图4A和图4B所示，所述的沟槽306在第二面板302上的平面形状可以有多种。在图4A所示的实施例中，在一个像素区域401中，所述沟槽306被设置为与像素区域401的边界平行的直线，这样能够形成双畴的结构。在图4B所示的实施例中，在一个像素区域401中，所述沟槽306被设置为折线形，这样能形成四畴的结构。为了更好的减少漏光，可以把所述折线的拐角处做成光滑连接，也即所述折线形的拐角处是可微的，没有尖锐的部分，这样进一步减少了尖锐的部分。当然，如本领域技术人员所知，沟槽306也能被设置成其他形状，例如呈关于像素区域401中心线对称的“八”字形。
如图3所示，在一个实施例中，除了在第二面板302上设置沟槽306之外，在第一面板上也设置至少一条沟槽307，沟槽307的结构与沟槽306可以相同也可以不同，也就是说，沟槽307可以是传统的有尖锐转角的结构，也可以是如前述实施例中沟槽的坡与第一面板其他部分及沟槽底部光滑连接的结构。在一个实施例中，沟槽306与沟槽307错位设置，即沟槽306在第二面板302上的位置与沟槽307在第一面板301上的位置错开。如图4A和图4B所示，沟槽307在第一面板301上的平面形状也可以是与相应像素区域内沟槽306的平面形状相同，且平行设置。
作为一个替代实施例，如图5所示，也可以在第二面板302上设置至少一个突起506，所述突起506的顶部为光滑形状，也即没有不可微的尖锐点，例如可以是圆弧形、平台形等等。突起506的顶部与突起506的坡光滑连接，同时突起506的坡与第二面板302的其他部分也光滑连接。这里“光滑连接”，意指该突起506的坡与第二面板302的其他部分以及突起506的顶部的连接部是可微的。所述第二面板302的其他部分可以与前述的实施例相同，此处不再赘述。
如图6A和图6B所示，所述的突起506在第二面板302上的平面形状可以有多种。在图4A所示的实施例中，在一个像素区域401中，所述突起506被设置为与像素区域401的边界平行的直线，这样能够形成双畴的结构。在图4B所示的实施例中，所述突起506被设置为折线形，这样能形成四畴的结构。为了更好的减少漏光，可以把所述折线的拐角处做成光滑连接， 也即所述折线形的拐角处是可微的，没有尖锐的部分，这样进一步减少了尖锐的部分。当然，如本领域技术人员所知，突起506也能被设置成其他形状当然，例如呈关于像素区域401中心线对称的“八”字形。
如图5所示，在一个实施例中，除了在第二面板302上设置突起506之外，在第一面板上也设置至少一条突起507，突起507的结构与突起506可以相同也可以不同，也就是说，突起507可以是传统的有尖锐转角的结构，也可以是如前述实施例中突起的坡与第一面板301其他部分及突起顶部光滑连接的结构。在一个实施例中，突起506与突起507错位设置，即突起506在第二面板302上的位置与突起507在第一面板301上的位置错开。如图4A和图4B所示，突起507在第一面板301上的平面形状也可以是与相应像素区域内突起506的平面形状相同，且平行设置。
上述设置沟槽的实施例和设置突起的实施例还可以互相结合，如图7所示，可以在一个面板上设置沟槽，而在另一个面板上设置突起，所述突起和沟槽可以错位设置。
采用上述本发明实施例的技术方案，由于沟槽306的坡与第二面板302其他部分以及沟槽306的底部连续光滑连接，不再有尖锐的部分，液晶分子在未通电时长轴指向不会紊乱，从而有效的减少了漏光现象。
如图8所示，本发明提供的一种液晶屏制造方法实施例，包括：
810、准备一面板，所述面板上涂覆有光敏层；
这里的面板可以使用透明材质，例如玻璃、塑料等；所述光敏层可以为各种对紫外线或其他波段光线敏感的材料，例如丙烯酸或环氧丙烯酸光聚合材料。在一个实施例中，所述光敏层的厚度为100微米。当然，本领域技术人员可以理解，上述数值均为示例，可以根据需要选用其他数值，本发明实施例对此不作限定。
820、在所述面板上放置掩模，所述掩模上设有透光率渐变的条纹；
所述条纹的形状与前述实施例中沟槽306的平面形状相同。这里，透光率渐变是指所述条纹处透光率是连续变化的，没有跳变。如本领域技术人员所知，在对应于沟槽的底部的条纹处透光率最高，而对应于无沟槽区域的透光率最低，在两者之间透光率连续变化。
830、对所述掩模曝光。
对所述掩膜曝光所用的光线是所述光敏层敏感的波段，例如光敏层对紫外线敏感，就使用紫外线曝光。在对所述掩膜曝光之后，面板上的光敏层在光的作用下被蚀刻出沟槽，由于掩膜上的条纹透光率是渐变的，因此沟槽的坡会平缓的过渡，不会出现尖锐部分，形成如前述液晶屏实施例所述的结构。
另外，以上实施例中分别说明的各技术、***、装置、方法以及各实施例中分别说明的技术特征可以进行组合，从而形成不脱离本发明的精神和原则之内的其他的模块，方法，装置，***及技术，这些根据本发明实施例的记载组合而成的模块，方法，装置，***及技术均在本发明的保护范围之内。
以上只是本发明的较佳实施例，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等，均包含在本发明的保护范围内。

Claims (17)

  1. 一种多畴垂直取向液晶屏，包括：
    第一面板和第二面板，所述第一面板平行于所述第二面板，所述第一面板和所述第二面板之间填充有液晶，所述第一面板和所述第二面板均透明；
    所述第一面板和所述第二面板的外侧分别覆盖第一偏振片和第二偏振片，所述第一偏振片和所述第二偏振片的透光轴互相垂直；
    所述第二面板上设置有至少一个第一沟槽，所述第一沟槽的坡与所述第二面板其他部分以及所述第一沟槽的底部光滑连接。
  2. 如权利要求1所述的液晶屏，其特征在于：
    所述第二面板上分割出至少一个像素区域，在所述像素区域中所述第一沟槽平行于所述像素区域的边界。
  3. 如权利要求1所述的液晶屏，其特征在于：
    所述第二面板上分割出至少一个像素区域，在所述像素区域中，所述第一沟槽为折线形。
  4. 如权利要求3所述的液晶屏，其特征在于：
    所述折线形的拐角处呈光滑连接。
  5. 如权利要求1-4任一项所述的液晶屏，其特征在于：
    在所述第一面板上设置至少一条第二沟槽，所述第二沟槽的坡与所述第一面板其他部分以及所述第一沟槽的底部光滑连接。
  6. 如权利要求5所述的液晶屏，其特征在于：
    所述第一沟槽与所述第二沟槽错位设置，且互相平行。
  7. 如权利要求1-6任一项所述的液晶屏，其特征在于：
    所述第一面板上设置有至少一个突起，所述突起的顶部为光滑形状，所述突起的顶部与所述突起的坡光滑连接，所述突起的坡与所述第一面板的其他部分光滑连接。
  8. 如权利要求7任一项所述的液晶屏，其特征在于：
    所述第一沟槽与所述突起错位设置，且互相平行。
  9. 一种多畴垂直取向液晶屏，包括：
    第一面板和第二面板，所述第一面板平行于所述第二面板，所述第一面板和所述第二面板之间填充有液晶，所述第一面板和所述第二面板均透明；
    所述第一面板和所述第二面板的外侧分别覆盖第一偏振片和第二偏振片，所述第一偏振片和所述第二偏振片的透光轴互相垂直；
    所述第二面板上设置有至少一个第一突起，所述第一突起的顶部为光滑形状，所述第一突起的顶部与所述第一突起的坡光滑连接，所述第一突起的坡与所述第一面板的其他部分光滑连接。
  10. 如权利要求9所述的液晶屏，其特征在于：
    所述第二面板上分割出至少一个像素区域，在所述像素区域中所述第一突起平行于所述像素区域的边界。
  11. 如权利要求9所述的液晶屏，其特征在于：
    所述第二面板上分割出至少一个像素区域，在所述像素区域中，所述第一突起为折线形。
  12. 如权利要求11所述的液晶屏，其特征在于：
    所述折线形的拐角处呈光滑连接。
  13. 如权利要求9-12任一项所述的液晶屏，其特征在于：
    在所述第一面板上设置至少一条第二突起，所述第二突起的顶部为光滑形状，所述第二突起的顶部与所述第二突起的坡光滑连接，所述第二突起的坡与所述第一面板的其他部分光滑连接。
  14. 如权利要求13所述的液晶屏，其特征在于：
    所述第一突起与所述第二突起错位设置，且互相平行。
  15. 如权利要求9-14任一项所述的液晶屏，其特征在于：
    所述第一面板上设置至少一条沟槽，所述沟槽的坡与所述第一面板其他部分以及所述沟槽的底部光滑连接。
  16. 如权利要求15任一项所述的液晶屏，其特征在于：
    所述第一突起与所述沟槽错位设置，且互相平行。
  17. 一种液晶屏制造方法，包括：
    准备一面板，所述面板上涂覆有光敏层；
    在所述面板上放置掩模，所述掩模上设有透光率渐变的条纹；
    对所述掩模曝光。
PCT/CN2015/077703 2015-04-28 2015-04-28 一种多畴垂直取向液晶屏及其制造方法 WO2016172857A1 (zh)

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