WO2017067017A1 - 一种液晶显示面板 - Google Patents

一种液晶显示面板 Download PDF

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Publication number
WO2017067017A1
WO2017067017A1 PCT/CN2015/093198 CN2015093198W WO2017067017A1 WO 2017067017 A1 WO2017067017 A1 WO 2017067017A1 CN 2015093198 W CN2015093198 W CN 2015093198W WO 2017067017 A1 WO2017067017 A1 WO 2017067017A1
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WIPO (PCT)
Prior art keywords
liquid crystal
metal
display panel
crystal display
wire grid
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PCT/CN2015/093198
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English (en)
French (fr)
Inventor
崔宏青
Original Assignee
深圳市华星光电技术有限公司
武汉华星光电技术有限公司
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Priority to US14/897,735 priority Critical patent/US20170336686A1/en
Publication of WO2017067017A1 publication Critical patent/WO2017067017A1/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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
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    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136204—Arrangements to prevent high voltage or static electricity failures
    • G—PHYSICS
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133334—Electromagnetic shields
    • 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
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133548—Wire-grid 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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
    • G—PHYSICS
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    • 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
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    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a liquid crystal display panel.
  • a general treatment method is to additionally provide an electrical shielding layer on the surface of the upper glass substrate (color film substrate) for electrical shielding treatment.
  • the material of the electrical shielding layer may be a conductive oxide such as indium tin oxide (ITO), antimony oxide, tin oxide, zinc oxide and other metals.
  • ITO indium tin oxide
  • a material of the electrical shielding layer may also be a nano conductive material such as carbon nanotubes
  • the electrical shielding layer may also be a polymer conductive film, a conductive ink, conductive particles or a conductive rod or the like.
  • the layer to which these materials are positioned may be located on the upper or lower surface of the color filter substrate, or in a layer structure of the polarizer, or in a glue layer in which the upper polarizer and the cover glass are bonded.
  • the electrical shielding layer can avoid the influence of the coupled electric field of the data driving electrode on the external touch signal.
  • an electrical shielding layer is also indispensable, which can effectively shield the influence of an electrostatic cumulative electric field caused by external charge accumulation on a touch signal. The latter will cause a decrease in signal to noise ratio.
  • the requirements for the electrical shielding layer are the same as in the first case: since the capacitive screen is separated from the display screen, the finger can touch the capacitive screen smoothly, and the scanning and detecting signals of the capacitive screen can be smoothly operated. It will be shielded by the electrical shielding layer located in the lower layer, in this way to avoid interference with the distortion of the liquid crystal molecules in the display screen, and the data signal of the display screen will also be coupled due to the presence of the electrical shielding layer located in the upper layer.
  • the impedance requirement for the electrical shielding layer is different from the first case and the second case: since the touch function layer is embedded in the display screen, if the impedance of the electrical shielding layer is excessive Low, it will block the touch sensing of the finger, so that the touch sensitivity is greatly reduced, and even the touch function is lost; but if the impedance of the electrical shielding layer is too high, the noise can not be effectively isolated, and the signal-to-noise ratio is seriously degraded.
  • FIG. 1 shows a liquid crystal display panel 100 of the prior art.
  • the liquid crystal display panel 100 includes a lower polarizer 101, an array substrate 102 (including a thin film transistor array, a touch sensor, and a common electrode or a ground electrode 107), a liquid crystal interlayer (not shown), and a color film in this order from bottom to top.
  • the electrical shielding layer 105 is electrically connected to the common electrode or the ground electrode 107 through the silver paddle 106.
  • the electrical shield layer 105 is first formed on the surface of the upper polarizer 104, and then the polarizer 104 is attached, and the silver paddle 106 is clicked. It can be seen that the liquid crystal display panel 100 shown in FIG. 1 has a complicated process, a large thickness, and a high cost, and at the same time, many steps are likely to cause errors.
  • FIG. 2 is a partial enlarged view of the junction of the electrical shielding layer 105 of the liquid crystal display panel 100 of FIG. 1 and the triacetate layer 104.1 of the upper polarizer 104.
  • the conductive shielding layer 105 includes a plurality of conductive polymers 105.1, and the entire electrical shielding layer 105 is disposed on the triacetate layer 104.1 of the upper polarizer 104.
  • Figure 2 clearly shows the junction of the two.
  • FIG. 3 shows another liquid crystal display panel 200 in the prior art.
  • the liquid crystal display panel 200 includes a lower polarizer 201, an array substrate 202 (including a thin film transistor array, a touch sensor, and a common electrode or a ground electrode 207), a liquid crystal interlayer (not shown), a color filter substrate 203, and electricity in order from bottom to top.
  • the electrical shielding layer 205 is electrically connected to the common electrode or the ground electrode 207 through the silver paddle 206.
  • an electrical shielding layer 205 is formed on the upper surface of the color filter substrate 203 (for example, by vapor deposition or sputtering of an indium tin oxide (ITO) electrical shielding layer), and then silver is spotted.
  • the paddle 206 is then attached with a polarizer 204. It can be seen that the liquid crystal display panel 200 shown in FIG. 3 has the same complicated steps, large thickness, and high cost, and at the same time, many steps are likely to cause errors.
  • a layer of conductive polymer is additionally added.
  • Layer 105 or metal oxide 205 Since the conductive polymer layer 105 or the conductive metal oxide 205 is added, a certain loss of transmittance is caused, so that the transmittance of the panel is lowered.
  • the present invention proposes an improved liquid crystal display panel.
  • a liquid crystal display panel includes an array substrate, a color filter substrate, and a liquid crystal interlayer therebetween, wherein on a surface of the color filter substrate facing the liquid crystal interlayer or in the A photo-electric functional layer is disposed on a surface of the color filter substrate remote from the liquid crystal interlayer, and the photoelectric functional layer can affect the polarization state of the light wave and can generate an electrical shielding effect.
  • the photoelectric functional layer can be used as a polarizing plate or an electrical shielding layer, and combines two functions in one body, so that the process of the entire liquid crystal display panel is simpler.
  • the optoelectronic functional layer is disposed as a metal wire grid structure at a position corresponding to the display region.
  • the impedance of the metal wire grid structure layer in the active area (AA) can be controlled by the thickness of the metal layer.
  • the thickness of the metal in the metal wire grid structure layer can be relatively thick. It is also possible to adjust the width of the metal layer, for example to increase the width of the metal layer.
  • the thickness of the metal wire grid structure layer can be reduced, or the width of the metal wire grid layer can be reduced, thereby adjusting the impedance of the metal wire grid to a Moderate level.
  • the optoelectronic functional layer includes a metal bezel in communication with the metal wire grid structure at a position corresponding to an edge of the display panel, the metal wire grid structure and the metal frame being simultaneously in the same layer Form a pattern.
  • the metal communication layer (metal frame) outside the AA area can bring the advantage that the net charge accumulated on the surface of the display can be quickly derived from various points around the circumference, compared with the electrical shielding layer of the prior art. Conductive media have a faster rate of conduction.
  • the metal bezel is electrically connected to a common electrode or a ground electrode.
  • the metal frame is bridged to the bonding pad at the bonding circuit of the array substrate by a point silver pad, the bonding pad being connected to the external common electrode signal or ground signal through the flexible circuit board.
  • the metal wire grid structure is composed of a metal of Al, Mo, Au, Cr, or an alloy material thereof.
  • the conductive properties of metal materials are different from those of general inorganic or organic materials.
  • the conductive impedance is relatively small, and the thickness of the metal layer can be reasonably controlled to obtain a moderately sized impedance value.
  • the metal wire grid structure is a single layer metal wire grid structure or a double layer metal wire grid structure.
  • the single-layer metal wire grid structure at least two metal strips extending in parallel in the same direction are disposed on a surface of the color filter substrate, and adjacent metal strips are separated by a wire grid.
  • the gaps have the same height in a direction perpendicular to the surface of the color filter substrate.
  • the double-layer metal wire grid structure at least two metal strips and dielectric strips extending in parallel in the same direction are disposed on a surface of the color filter substrate, and the metal strip and the strip The dielectric strips are staggered without gaps, and are covered with metal strips on the surface of the dielectric strip remote from the color filter substrate.
  • the metal strips have the same size in a direction perpendicular to the surface of the color filter substrate, the height of the dielectric strip being greater than the size of the metal strip.
  • the polarization direction of the incident light mainly includes two cases parallel to the metal strip and perpendicular to the metal strip; the polarization direction of the reflected light mainly includes the case of being parallel to the metal strip; the polarization direction of the transmitted light mainly includes perpendicular to The case of metal strips.
  • Figure 1 shows a liquid crystal display panel in the prior art
  • FIG. 2 is a partial enlarged view showing a joint portion of an electrical shielding layer and an upper polarizer of the liquid crystal display panel of FIG. 1;
  • FIG. 3 shows another liquid crystal display panel in the prior art
  • FIG. 4 is a schematic structural view of a liquid crystal display panel according to the present invention.
  • Figure 5 shows an electrical shielding layer of a first embodiment of a liquid crystal display panel according to the present invention
  • Fig. 6 shows an electrical shielding layer of a second embodiment of a liquid crystal display panel according to the present invention.
  • Fig. 4 is a view showing the structure of a liquid crystal display panel according to the present invention.
  • a liquid crystal display panel 300 includes an array substrate 302, a color filter substrate 303, and a liquid crystal interlayer (not shown) therebetween.
  • a photoelectric functional layer is provided, which can affect the polarization state of the light wave while being capable of generating an electrical shielding effect.
  • the photoelectric functional layer is disposed as a metal wire grid structure 304 at a position corresponding to the display region. There is a wire grid gap 305 between the metal wire grids 304.
  • the optoelectronic functional layer includes a metal bezel 312 in communication with the metal wire grid structure 304 at a location corresponding to the edge of the display panel. Structurally, the metal wire grid structure 304 and the metal frame 312 can be simultaneously patterned in the same layer.
  • the electric field vector of the transmitted light of the wire grid structure is perpendicular to the wire grid, which we call P light (or TM wave), and the electric field vector of the reflected light of the wire grid structure is parallel to the wire grid.
  • P light or TM wave
  • S light or TE
  • Light Taking metal aluminum as the metal material of the metal wire grid structure as an example: the real and imaginary parts of the equivalent refractive index of the TE wave grating aluminum layer are relatively large, the aluminum layer is equivalent to the metal film, and most of the TE waves are reflected and absorbed; The equivalent refractive index of the TM wave aluminum layer is larger and the imaginary part is smaller. The aluminum layer is equivalent to the dielectric layer with weak absorption properties, and most of the TM waves penetrate.
  • the periodic pitch of the metal wire grid is generally smaller than the wavelength of visible light, that is, it is a sub-wavelength metal wire grid.
  • the metal bezel 312 can be electrically connected to a common electrode or a ground electrode. Specifically, the metal bezel 312 can be bridged to the bonding pad 307 at the bonding circuit of the array substrate 302 by the point silver paddle 306. The bonding pad 307 can be connected to the external common electrode signal or ground signal through the flexible circuit board. As is clear from FIG. 4, the bonding pad 307 can be located in the vicinity of the data driving circuit 311.
  • the metal wire grid structure 304 may be composed of a metal of Al, Mo, Au, Cr, or an alloy material thereof.
  • the conductive properties of metal materials are different from those of general inorganic or organic materials.
  • the conductive impedance is relatively small, and the thickness of the metal layer can be reasonably controlled to obtain a moderately sized impedance value.
  • the metal wire grid structure 304 may be a single layer metal wire grid structure or a double layer metal wire grid structure.
  • Fig. 5 shows an electrical shielding layer of a first embodiment of a liquid crystal display panel according to the present invention.
  • the metal wire grid structure 304 is a single layer metal wire grid structure.
  • At least two metal strips 304.3 extending in parallel in the same direction are disposed on the surface of the color filter substrate 303, and the adjacent metal strips 304.3 are separated by a wire grid gap 305.
  • the metal strips 304.3 have the same height in a direction perpendicular to the surface of the color filter substrate 303. As can be clearly seen in FIG.
  • the polarization direction of the incident light 310 mainly includes two cases parallel to the metal strip 304.3 and perpendicular to the metal strip 304.3; the polarization direction of the reflected light 308 mainly includes the case parallel to the metal strip 304.3; The direction of polarization of light 309 primarily includes the case perpendicular to metal strip 304.3.
  • Fig. 6 shows an electrical shielding layer of a second embodiment of a liquid crystal display panel according to the present invention.
  • the metal wire grid structure 304 is a two-layer metal wire grid structure.
  • the double-layer metal wire grid structure at least two metal strips 304.2 and three dielectric strips 304.1 extending in parallel in the same direction are disposed on the surface of the color filter substrate 303, and the metal strips 304.2 and the dielectric strips 304.1 are staggered without gaps.
  • a metal strip 304.2 is again covered.
  • the dielectric strip 304.1 is light transmissive.
  • the polarization direction of the incident light 310 mainly includes two cases parallel to the metal strip 304.2 and perpendicular to the metal strip 304.2; the polarization direction of the reflected light 308 mainly includes the case parallel to the metal strip 304.2; The polarization direction of the transmitted light 309 mainly includes the case of being perpendicular to the metal strip 304.2.
  • the present invention provides a polarizing plate of a nano metal wire grid structure, which may be a single layer metal wire grid structure or a double metal wire grid structure.
  • the metal wire grid structure is located on the upper glass substrate of the liquid crystal cell, that is, the color filter film substrate.
  • the metal wire grid structure may be located on the upper surface of the color filter film substrate or on the lower surface of the color filter film substrate.
  • the region connected to the metal wire grid structure retains a planar metal layer (ie, a metal frame), and the planar metal layer region can be used to dot silver
  • the paddle is then connected to the bonding pad of the lower glass substrate on the bonding IC region.
  • the bonding pad can be connected to the external motherboard circuit through a flexible circuit board, and the bonding pad can be connected to the common circuit board through the flexible circuit board.
  • the electrode signal can also be connected to a ground signal.
  • the metal wire grid structure for polarization is located only in the window area of the display (ie, the AA area, Active area), and the metal substrate of the upper substrate corresponding to the area other than the AA area is provided with a metal layer that communicates with each other ( That is, a metal frame), which can be formed together when the metal wire grid pattern is formed in the AA region.
  • the peripheral metal layer may be connected to the common electrode or the ground electrode of the lower substrate through the conductive silver paste.
  • the metal wire grid structure layer can be used as a polarizing plate or an electrical shielding layer, and combines two functions in one body, so that the process of the entire liquid crystal display panel is simpler.
  • the impedance of the metal wire grid structure layer in the active area (AA) can be controlled by the thickness of the metal layer.
  • the thickness of the metal in the metal wire grid structure layer can be relatively thick. It is also possible to adjust the width of the metal layer, for example to increase the width of the metal layer.
  • the thickness of the metal wire grid structure layer can be reduced, or the width of the metal wire grid layer can be reduced, thereby adjusting the impedance of the metal wire grid to a Moderate level.
  • the metal communication layer (metal frame) outside the AA area can bring the advantage that the net charge accumulated on the surface of the display can be quickly derived from various points around the circumference, compared with the electrical shielding layer in the prior art.
  • the conductive medium used has a faster conduction rate.

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Abstract

一种液晶显示面板（300），其包括阵列基板（302）、彩膜基板（303）和位于二者之间的液晶夹层，其中，在彩膜基板（303）的朝向液晶夹层的表面上或在彩膜基板（303）的远离液晶夹层的表面上设有光电功能层，光电功能层能够影响光波的偏振状态，同时能够产生电性屏蔽效应。从而，光电功能层既可以作为偏振片，也可以作为电性屏蔽层，集两种功能于一身，使得整个液晶显示面板（300）的制程更加简单。

Description

一种液晶显示面板
相关申请的交叉引用
本申请要求享有于2015年10月23日提交的名称为“一种液晶显示面板”的中国专利申请CN201510694979.1的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，尤其涉及一种液晶显示面板。
背景技术
关于显示器的电性屏蔽技术，现有技术中大致存在以下三种情况。
第一种情况：对于目前被广泛应用的边缘场切换式液晶显示装置(Fringe field switching-Liquid Crystal Display,FFS-LCD)而言，其像素电极和公共电极都位于液晶盒的下玻璃基板(阵列基板)，上玻璃基板(彩膜基板)上没有任何电极层。因此，当液晶盒的外表面上有静电荷的累积时，很容易产生附加的电场，影响液晶分子的排列，从而导致显示画面异常，即产生画异。对此，一般的处理方法是，额外在上玻璃基板(彩膜基板)的表面设置电性屏蔽层以做电性屏蔽处理。该电性屏蔽层的材料可以采用导电的氧化物，例如铟锡氧化物(ITO)、锑氧化物(antimony oxide)、锡氧化物(tin oxide)、鋅氧化物(zinc oxide)以及其他的金属氧化物或者合金氧化物等；电性屏蔽层的材料也可以采用纳米导电材料，例如碳纳米管；电性屏蔽层还可以采用聚合物导电膜、导电墨水、导电颗粒或导电棒等等。这些材料所定位的层可以位于彩膜基板的上表面或者下表面，也可以位于偏光片的某层结构中，或者位于上偏光片与玻璃盖板相粘结的胶层中。
第二种情况：对于采用外挂式触控结构的液晶显示装置而言，电性屏蔽层可以避免数据驱动电极的耦合电场对外挂触控的信号造成影响。
第三种情况：对于采用内嵌式触控结构的液晶显示装置而言，电性屏蔽层也是必不可少的，它可以有效地屏蔽由外界电荷累积造成的静电累积电场对于触摸信号的影响，后者会引起信噪比下降。
在第一种情况中，电性屏蔽层的阻抗值越小越好：阻抗小，意味着屏幕表面累积的静电荷可以快速导出，以此来避免静电电场的干扰影响。在第二种情况中，对于电性屏蔽层的要求，与第一种情况一样：由于电容屏与显示屏幕是分离的，手指触控电容屏时，可以顺畅操作，电容屏的扫描和检测信号会被位于其下层的电性屏蔽层屏蔽，以此方式避免干扰到显示屏幕中液晶分子的畸变，同时显示屏幕的数据信号也会由于位于其上层的电性屏蔽层的存在，而不会耦合影响到触屏的信号。在上述第三种情况中，对于电性屏蔽层的阻抗要求则与第一种情况和第二种情况不尽相同：由于触摸功能层内嵌于显示屏幕内，如果电性屏蔽层的阻抗过低，会屏蔽手指的触摸感应，使触摸灵敏度大大降低，甚至丧失触摸功能；但是如果电性屏蔽层的阻抗过高，又不能有效隔绝噪音，使信噪比下降严重。
图1显示了现有技术中的一种液晶显示面板100。参照图1，液晶显示面板100从下至上依次包括下偏光片101、阵列基板102(包括薄膜晶体管阵列、触摸传感器以及公共电极或接地电极107)、液晶夹层(图中未示出)、彩膜基板103、上偏光片104以及电性屏蔽层105。其中电性屏蔽层105通过银桨106电连接到公共电极或接地电极107。这种情况中，在制造工序上，首先在上偏光片104的表面制作电性屏蔽层105，然后贴附上偏光片104，再点银桨106。可见，图1所示的液晶显示面板100工序繁杂、厚度较大、成本偏高，同时，其中容易造成误差的步骤较多。
图2显示了图1中液晶显示面板100的电性屏蔽层105与上偏光片104的三醋酸纤维层104.1的接合处的局部放大图。从图2可清楚地看出，在液晶显示面板100中，电性屏蔽层105中包括多个导电高分子105.1，而整个电性屏蔽层105设置在上偏光片104的三醋酸纤维层104.1上，图2清楚地显示了二者的接合处。
图3显示了现有技术中的另一种液晶显示面板200。液晶显示面板200从下至上依次包括下偏光片201、阵列基板202(包括薄膜晶体管阵列、触摸传感器以及公共电极或接地电极207)、液晶夹层(图中未示出)、彩膜基板203、电性屏蔽层205以及上偏光片204。其中电性屏蔽层205通过银桨206电连接到公共电极或接地电极207。这种情况中，在制造工序上，首先在彩膜基板203的上表面制作电性屏蔽层205(例如通过蒸镀或溅射氧化铟锡(ITO)电性屏蔽层来完成)，再点银桨206，然后贴附上偏光片204。可见，图3所示的液晶显示面板200同样工序繁杂、厚度较大、成本偏高，同时，其中容易造成误差的步骤较多。
综上所述，在上述图1和图3所示的两种现有技术中的液晶显示面板中，由于除了上偏光片104、204的固有结构之外，还分别附加了一层导电高分子层105或者金属氧化物205。由于附加了导电高分子层105或者导电金属氧化物205，会造成一定的穿透率的损失，所以面板的穿透率会随之降低。
发明内容
针对上述现有技术中的问题，即现有技术中的液晶显示面板阻抗难以控制且降低光线穿透率，本发明提出了一种改进的液晶显示面板。
在一个实施方式中，根据发明的液晶显示面板包括阵列基板、彩膜基板和位于二者之间的液晶夹层，其中，在所述彩膜基板的朝向所述液晶夹层的表面上或在所述彩膜基板的远离所述液晶夹层的表面上设有光电功能层，所述光电功能层能够影响光波的偏振状态，同时能够产生电性屏蔽效应。以此方式，所述光电功能层既可以作为偏振片，也可以作为电性屏蔽层，集两种功能于一身，使得整个液晶显示面板的制程更加简单。
在一个实施方式中，所述光电功能层在与显示区域相对应的位置处设置为金属线栅结构。显示区(Active Area,AA)内的金属线栅结构层的阻抗可以通过金属层的厚度控制。如此一来，对于背景技术部分所介绍的第一种情况和第二种情况而言(要求阻抗低)，金属线栅结构层内的金属厚度可以比较厚。也可以调整金属层的宽度，例如增加金属层的宽度。对于背景技术部分所介绍的第三种情况而言(要求阻抗比较高)，可以将金属线栅结构层的厚度降低，或者减小金属线栅层的宽度，从而调节金属线栅的阻抗到一个适中的水准。
在一个实施方式中，所述光电功能层在与显示面板边缘所对应的位置处包括与所述金属线栅结构连通的金属边框，所述金属线栅结构和所述金属边框在同一层中同时形成图案。AA区以外的金属连通层(金属边框)可以带来如下优势，即显示器表面累积的净电荷可以从四周各个位置点快速导出，相比较现有技术中的电性屏蔽层而言，所使用的导电介质具有更快的导电速率。
在一个实施方式中，所述金属边框电连接到公共电极或接地电极。
在一个实施方式中，通过点银桨使得所述金属边框跨接到位于阵列基板的粘接电路处的粘接垫上，所述粘接垫通过柔性电路板与外界的公共电极信号或接地信号相连。
在一个实施方式中，所述金属线栅结构由Al、Mo、Au、Cr的金属或者它们的合金材料构成。金属材料的导电特性不同于一般的无机或者有机材料，其导电阻抗比较小，合理地控制金属层的厚度，就可以得到大小适中的阻抗值。
在一个实施方式中，所述金属线栅结构为单层金属线栅结构或双层金属线栅结构。
在一个实施方式中，在所述单层金属线栅结构中，在所述彩膜基板的表面上设置有至少两条沿同一方向平行延伸的金属条，相邻的金属条之间相隔有线栅间隙，在垂直于所述彩膜基板的表面的方向上，所述金属条具有相同的高度。
在一个实施方式中，在所述双层金属线栅结构中，在所述彩膜基板的表面上设置有沿同一方向平行延伸的金属条和介质条各至少两条，所述金属条和所述介质条无间隙地交错排列，在所述介质条的远离所述彩膜基板的表面上再度覆盖有金属条。
在一个实施方式中，在垂直于所述彩膜基板的表面的方向上，所述金属条具有相同的尺寸，所述介质条的高度大于所述金属条的尺寸。
在这两种情况中，入射光的偏振方向主要包括平行于金属条和垂直于金属条两种情况；反射光的偏振方向主要包括平行于金属条的情况；透射光的偏振方向主要包括垂直于金属条的情况。
上述技术特征可以各种适合的方式组合或由等效的技术特征来替代，只要能够达到本发明的目的。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中：
图1显示了现有技术中的一种液晶显示面板；
图2显示了图1中液晶显示面板的电性屏蔽层与上偏光片的接合处的局部放大图；
图3显示了现有技术中的另一种液晶显示面板；
图4显示了根据本发明的液晶显示面板的结构示意图；
图5显示了根据本发明的液晶显示面板的第一实施例的电性屏蔽层；以及
图6显示了根据本发明的液晶显示面板的第二实施例的电性屏蔽层。
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例。
具体实施方式
下面将结合附图对本发明作进一步说明。
图4显示了根据本发明的液晶显示面板的结构示意图。
参照图4，在一个实施例中，根据本发明的液晶显示面板300包括阵列基板302、彩膜基板303和位于二者之间的液晶夹层(图中未示出)。在彩膜基板303的朝向液晶夹层的表面上或在彩膜基板303的远离液晶夹层的表面上设有光电功能层，该光电功能层能够影响光波的偏振状态，同时能够产生电性屏蔽效应。
进一步地，该光电功能层在与显示区域相对应的位置处设置为金属线栅结构304。金属线栅304之间具有线栅间隙305。该光电功能层在与显示面板边缘所对应的位置处包括与金属线栅结构304连通的金属边框312。结构上，可以使得金属线栅结构304和金属边框312在同一层中同时形成图案。
线栅结构的透射光的电场矢量垂直于线栅，我们称之为P光(或者TM波)，而线栅结构的反射光的电场矢量平行于线栅，我们称之为S光(或者TE光)。以金属铝作为金属线栅结构的金属材料为例：TE波光栅铝层等效折射率实部和虚部都比较大，铝层等效于金属膜，大部分的TE波被反射和吸收；而TM波铝层的等效折射率实部较大，虚部较小，铝层等效于具有微弱吸收性质的介质层，大部分的TM波穿透。金属线栅的周期节距一般小于可见光的波长，即其为亚波长金属线栅。
金属边框312可电连接到公共电极或接地电极。具体地，可以通过点银桨306使得金属边框312跨接到位于阵列基板302的粘接电路处的粘接垫307上。粘接垫307可通过柔性电路板与外界的公共电极信号或接地信号相连。从图4中可清楚看出，粘接垫307可位于数据驱动电路311的附近。
在材料构成方面，金属线栅结构304可由Al、Mo、Au、Cr的金属或者它们的合金材料构成。金属材料的导电特性不同于一般的无机或者有机材料，其导电阻抗比较小，合理地控制金属层的厚度，就可以得到大小适中的阻抗值。
在不同的情况中，金属线栅结构304可以为单层金属线栅结构或双层金属线栅结构。
图5显示了根据本发明的液晶显示面板的第一实施例的电性屏蔽层。在第一实施例中，金属线栅结构304为单层金属线栅结构。在单层金属线栅结构304中， 在彩膜基板303的表面上设置有至少两条沿同一方向平行延伸的金属条304.3，相邻的金属条304.3之间相隔有线栅间隙305。在垂直于彩膜基板303的表面的方向上，金属条304.3具有相同的高度。在图5中可清楚地看到，入射光310的偏振方向主要包括平行于金属条304.3和垂直于金属条304.3两种情况；反射光308的偏振方向主要包括平行于金属条304.3的情况；透射光309的偏振方向主要包括垂直于金属条304.3的情况。
图6显示了根据本发明的液晶显示面板的第二实施例的电性屏蔽层。在第二实施例中，金属线栅结构304为双层金属线栅结构。在双层金属线栅结构中，在彩膜基板303的表面上设置有沿同一方向平行延伸的金属条304.2和介质条304.1各至少两条，金属条304.2和介质条304.1无间隙地交错排列，在介质条304.1的远离彩膜基板303的表面上再度覆盖有金属条304.2。介质条304.1为透光的。在第一层的金属条304.2两两之间相隔有间隙，该间隙由介质条304.1填充；在第二层的金属条304.2之间相隔有间隙313。观察图6，可清楚地看出，在垂直于彩膜基板303的表面的方向上，金属条304.2具有相同的尺寸，而介质条304.1的高度大于金属条304.2的尺寸。
在图6中还可清楚地看到，入射光310的偏振方向主要包括平行于金属条304.2和垂直于金属条304.2两种情况；反射光308的偏振方向主要包括平行于金属条304.2的情况；透射光309的偏振方向主要包括垂直于金属条304.2的情况。
将上述两种情况对比：在单层金属线栅结构中，在同一透明基板表面，只存在一个高度的金属线栅层；在双层金属线栅结构中，在同一透明基板表面，存在两种不同高度的金属线栅层交错排列。单就制程工艺而言，双层金属线栅结构的制程工艺更加简单。
综上所述，本发明提出了一种纳米金属线栅结构的偏振片，该偏振片可以是单层金属线栅结构，也可以是双层金属线栅结构。该金属线栅结构位于液晶盒的上玻璃基板、即彩色滤光膜基板。该金属线栅结构可以位于彩色滤光膜基板的上表面，也可以位于彩色滤光膜基板的下表面。在彩色滤光膜基板对应显示边缘区域(非显示开窗区域)的位置处，与金属线栅结构相连接的区域保留平面的金属层(即金属边框)，平面金属层区域可以用来点银桨，从而跨接到下玻璃基板的位于粘接电路(bonding IC)区域的粘接垫上。该粘接垫(bonding pad)可通过柔性电路板与外界主板电路相连，该粘接垫(bonding pad)可以通过柔性电路板连接到共 电极信号，也可以连接到接地信号。
起到偏振作用的金属线栅结构只位于显示的开窗区(即显示的AA区，Active area)，而上基板的对应于AA区以外的区域的位置处，设置有相互连通的金属层(即金属边框)，其可以在AA区形成金属线栅图案时一同形成。外围的金属层可以通过导电银浆与下基板的公共电极或者接地电极相连。
根据本发明的液晶显示面板带来了诸多好处：
(1)金属线栅结构层既可以作为偏振片，也可以作为电性屏蔽层，集两种功能于一身，使得整个液晶显示面板的制程更加简单。
(2)显示区(Active Area,AA)内的金属线栅结构层的阻抗可以通过金属层的厚度控制。如此一来，对于背景技术部分所介绍的第一种情况和第二种情况而言(要求阻抗低)，金属线栅结构层内的金属厚度可以比较厚。也可以调整金属层的宽度，例如增加金属层的宽度。对于背景技术部分所介绍的第三种情况而言(要求阻抗比较高)，可以将金属线栅结构层的厚度降低，或者减小金属线栅层的宽度，从而调节金属线栅的阻抗到一个适中的水准。
(3)AA区以外的金属连通层(金属边框)可以带来如下优势，即显示器表面累积的净电荷可以从四周各个位置点快速导出，相比较现有技术中的电性屏蔽层而言，所使用的导电介质具有更快的导电速率。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。

Claims (10)

  1. 一种液晶显示面板，其中，包括阵列基板、彩膜基板和位于二者之间的液晶夹层，
    其中，在所述彩膜基板的朝向所述液晶夹层的表面上或在所述彩膜基板的远离所述液晶夹层的表面上设有光电功能层，所述光电功能层能够影响光波的偏振状态，同时能够产生电性屏蔽效应。
  2. 根据权利要求1所述的液晶显示面板，其中，所述光电功能层在与显示区域相对应的位置处设置为金属线栅结构。
  3. 根据权利要求2所述的液晶显示面板，其中，所述光电功能层在与显示面板边缘所对应的位置处包括与所述金属线栅结构连通的金属边框，所述金属线栅结构和所述金属边框在同一层中同时形成图案。
  4. 根据权利要求3所述的液晶显示面板，其中，所述金属边框电连接到公共电极或接地电极。
  5. 根据权利要求4所述的液晶显示面板，其中，通过点银桨使得所述金属边框跨接到位于阵列基板的粘接电路处的粘接垫上，所述粘接垫通过柔性电路板与外界的公共电极信号或接地信号相连。
  6. 根据权利要求3所述的液晶显示面板，其中，所述金属线栅结构由Al、Mo、Au、Cr的金属或者它们的合金材料构成。
  7. 根据权利要求2所述的液晶显示面板，其中，所述金属线栅结构为单层金属线栅结构或双层金属线栅结构。
  8. 根据权利要求7所述的液晶显示面板，其中，在所述单层金属线栅结构中，在所述彩膜基板的表面上设置有至少两条沿同一方向平行延伸的金属条，相邻的金属条之间相隔有线栅间隙，
    在垂直于所述彩膜基板的表面的方向上，所述金属条具有相同的高度。
  9. 根据权利要求7所述的液晶显示面板，其中，在所述双层金属线栅结构中，在所述彩膜基板的表面上设置有沿同一方向平行延伸的金属条和介质条各至少两条，所述金属条和所述介质条无间隙地交错排列，在所述介质条的远离所述彩膜基板的表面上再度覆盖有金属条。
  10. 根据权利要求9所述的液晶显示面板，其中，在垂直于所述彩膜基板的 表面的方向上，所述金属条具有相同的尺寸，所述介质条的高度大于所述金属条的尺寸。
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