WO2016186062A1 - 液晶表示パネル - Google Patents
液晶表示パネル Download PDFInfo
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- WO2016186062A1 WO2016186062A1 PCT/JP2016/064408 JP2016064408W WO2016186062A1 WO 2016186062 A1 WO2016186062 A1 WO 2016186062A1 JP 2016064408 W JP2016064408 W JP 2016064408W WO 2016186062 A1 WO2016186062 A1 WO 2016186062A1
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- liquid crystal
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- display panel
- crystal display
- conductive
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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
- G02F1/1345—Conductors connecting electrodes to cell terminals
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
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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
- G02F1/13338—Input devices, e.g. touch panels
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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
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- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13458—Terminal pads
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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
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13396—Spacers having different sizes
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13398—Spacer materials; Spacer properties
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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
- G02F2202/00—Materials and properties
- G02F2202/16—Materials and properties conductive
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- 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
- G02F2202/22—Antistatic materials or arrangements
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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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a liquid crystal display panel. More specifically, the present invention relates to a liquid crystal display panel having a specific structure suitable for a horizontal electric field mode liquid crystal display device such as an IPS (In-Plane Switching) mode or an FFS (Fringe Field Switching) mode.
- IPS In-Plane Switching
- FFS Frringe Field Switching
- a liquid crystal display panel is configured by sandwiching a liquid crystal layer as a display medium between a pair of glass substrates and the like, and is utilized for car navigation, electronic books, photo frames, industrial equipment, televisions, taking advantage of its thin, lightweight, and low power consumption.
- Personal computers, smartphones, tablet terminals, etc. are indispensable for daily life and business.
- liquid crystal display panels of various modes related to electrode arrangement and substrate design for changing the optical characteristics of the liquid crystal layer have been studied.
- a vertical electric field method and a horizontal electric field method are known.
- a pixel electrode formed on one substrate a substrate on which a thin film transistor (TFT) element that supplies a display signal to the pixel electrode [TFT substrate]
- TFT substrate a substrate on which a thin film transistor (TFT) element that supplies a display signal to the pixel electrode [TFT substrate]
- TFT substrate an electric field in a generally vertical direction (normal direction of the substrate surface) is applied to the liquid crystal layer using the common electrode formed on the (opposite substrate).
- a TN (Twisted Nematic) mode, a VA (Vertical Alignment) mode using a liquid crystal having negative dielectric anisotropy and a vertical alignment film are known.
- a horizontal electric field liquid crystal display panel a common electrode is formed on a TFT substrate together with a pixel electrode, and an electric field in a substantially horizontal direction (a direction parallel to the substrate surface) is applied to the liquid crystal layer using the pixel electrode and the common electrode.
- in-plane switching As a lateral electric field type liquid crystal panel, in-plane switching (IPS: In-Plane) in which liquid crystal molecules having positive or negative dielectric anisotropy are horizontally aligned with respect to a substrate surface and a lateral electric field is applied to the liquid crystal layer.
- IPS in-plane switching
- Examples include a switching mode and a fringe field switching (FFS) mode.
- IZO indium zinc oxide
- CF substrate horizontal electric field type counter substrate
- connection with a terminal of a TFT substrate is performed.
- the structure which uses electrically conductive paste as a member is disclosed (for example, refer patent document 1).
- a horizontal electric field type liquid crystal display device having a similar connecting member is disclosed (for example, see Patent Documents 2 to 4).
- an electrode for driving liquid crystal is usually not disposed on the surface (back surface) of the color filter substrate (CF substrate) on the liquid crystal layer side. Therefore, when the surface (surface) opposite to the liquid crystal layer side of the CF substrate is charged, an electric field in the vertical direction (normal direction of the substrate surface) is generated, and the lateral direction (substrate) applied to the liquid crystal layer Affects the electric field in the direction parallel to the surface). As a result, there is a problem of deterioration in display quality, such as liquid crystal molecules are oriented in an unfavorable direction and unevenness occurs.
- a configuration in which a transparent conductive film is formed on the surface of a CF substrate and static electricity is removed via a terminal portion such as a charge removal terminal portion of the TFT substrate on which a TFT element is formed is conventionally known.
- Examples of the member that electrically connects the transparent conductive film and the terminal portion include a conductive paste.
- the electrical resistance increases in environmental tests (also called reliability tests, especially high-temperature and high-humidity tests). Or eventually ceased to conduct.
- the conductive paste a mixture of a flaky conductive filler or a spherical conductive filler in an epoxy resin or a thermoplastic resin is mainly used.
- ITO indium tin oxide
- the surface has a dense concavo-convex shape, so the anchor effect is strong and the conductive paste is difficult to peel off. Therefore, the conductivity is relatively stable.
- Patent Document 1 uses IZO as a shield electrode on the surface of a lateral electric field type counter substrate (CF substrate), and uses a conductive paste (silver paste) as a connection member with a terminal of the TFT substrate.
- CF substrate lateral electric field type counter substrate
- conductive paste silver paste
- FIG. 1 of Patent Document 1 The configuration is disclosed (FIG. 1 of Patent Document 1).
- Patent Documents 2 to 4 do not disclose the above-mentioned problem and the above-mentioned improvement measures, and there is room for improvement.
- the present invention has been made in view of the above-mentioned present situation, and it is possible to stably remove static electricity while maintaining the electrical connection between the transparent conductive film of one substrate of the liquid crystal display panel and the terminal portion of the other substrate.
- An object of the present invention is to provide a liquid crystal display panel that can be used.
- the present inventors stably remove static electricity.
- a conductive paste a flaky conductive filler and a conductive material different from the flaky conductive filler (for example, a conductive material, material, size, etc. having a different shape from a flaky conductive filler such as a spherical conductive filler) A material mixed with different conductive materials) is used.
- a conductive paste in which only a flaky conductive filler is mixed with a binder, only a conductive material different from the flaky conductive filler is used.
- the conductive paste mixed in the binder, the flaky conductive filler and the conductive paste mixed with the conductive material different from the flaky conductive filler were each tested, and the results were examined.
- the electrical resistance value between ITO and the conductive paste was low and stable, and no particular problem was found in the high temperature and high humidity test.
- the present inventors when automatically applying to the panel surface with a device filled with a conductive paste into a syringe, the thixo ratio becomes high when only the flaky conductive filler is blended, and the conductive paste is difficult to be ejected from the syringe. Since it may decrease, a material with a combination of a flaky conductive filler and a conductive material different from the flaky conductive filler will give an appropriate leveling property and workability (fluidity of the conductive paste itself) I found it better.
- a conductive member that electrically connects the transparent conductive film and the terminal portion and the conductive member includes a flake-shaped conductive filler and a liquid crystal containing a conductive material different from the flake-shaped conductive filler It may be a display panel.
- the present invention is described in detail below.
- the conductive material different from the flaky conductive filler is preferably a spherical conductive filler.
- the second substrate is preferably a TFT substrate.
- the first substrate is preferably a counter substrate facing the TFT substrate.
- at least one of the transparent conductive film of the first substrate and the terminal portion of the second substrate preferably has a surface roughness Ra of 3 nm or less, preferably 2 nm or less. More preferably, it is 1 nm or less.
- the surface roughness Ra can be measured by a method defined in JIS B 0601: 2001.
- At least one of the transparent conductive film of the first substrate and the surface of the terminal portion of the second substrate is made of indium zinc oxide.
- the size of the conductive material different from the flaky conductive filler is preferably 1 ⁇ 2 or less of the size of the flaky conductive filler.
- the volume-based content ratio between the flaky conductive filler and the conductive material different from the flaky conductive filler is preferably 10/90 to 90/10.
- the transparent conductive film of the first substrate is preferably a touch panel sensor electrode.
- the conductive member is a sealing material that adheres the first substrate and the second substrate and seals the liquid crystal layer.
- the transparent conductive film is provided on the surface opposite to the liquid crystal layer side of the first substrate.
- the transparent conductive film is provided on the surface of the first substrate on the liquid crystal layer side.
- the second substrate includes a plurality of thin film transistor elements, a plurality of pixel electrodes respectively connected to the plurality of thin film transistor elements, and a common electrode.
- a lateral electric field type liquid crystal panel that controls the alignment direction of liquid crystal molecules by an electric field in a direction parallel to the second substrate surface generated between the electrode and the common electrode. That is, the second substrate in the liquid crystal display panel of the present invention includes a plurality of thin film transistor elements, a plurality of pixel electrodes respectively connected to the plurality of thin film transistor elements, and a common electrode, and is parallel to the second substrate surface.
- the liquid crystal panel be a horizontal electric field type in which a potential difference is generated between the plurality of pixel electrodes and the common electrode when display is performed by controlling the alignment direction of the liquid crystal molecules by an electric field in the direction.
- the electric field in the parallel direction may be what is called a horizontal electric field in the technical field of a horizontal electric field type liquid crystal panel, and may be an electric field in a substantially parallel direction.
- the pixel electrode and the common electrode are provided in different layers with an insulating film interposed therebetween, and the surface of the terminal portion is formed of the pixel electrode and the common electrode. It is preferable that the electrode is formed of the same material as the electrode on the side close to the liquid crystal layer.
- the liquid crystal display panel of the present invention can stably remove static electricity while maintaining the electrical connection between the transparent conductive film of one substrate of the liquid crystal display panel and the discharge terminal portion of the other substrate. is there.
- FIG. 2 is a schematic cross-sectional view of the liquid crystal display panel of Embodiment 1.
- FIG. It is the elements on larger scale of FIG. 1, and shows the mode before and after a high temperature / humidity test. It is a graph of resistance value (ohm) with respect to time (h) at the time of performing a high temperature, high humidity test with respect to the liquid crystal display panel of Embodiment 1.
- FIG. It is a cross-sectional schematic diagram before the high-temperature, high-humidity test of the liquid crystal display panel of the comparative example 1. It is a cross-sectional schematic diagram after the high-temperature, high-humidity test of the liquid crystal display panel of Comparative Example 1.
- FIG. 6 is a schematic cross-sectional view of a liquid crystal display panel of Embodiment 3.
- FIG. It is the elements on larger scale of FIG. It is a cross-sectional schematic diagram of a liquid crystal display panel in which a transparent conductive film is disposed on a CF substrate and static electricity is removed via a charge removal terminal on the TFT substrate.
- a conductive paste (also referred to as a conductive adhesive) is cured after electrically connecting a transparent conductive film on one substrate of a liquid crystal display panel and a static elimination terminal portion on the other substrate.
- the flaky conductive filler has an aspect ratio of 2 or more and 200 or less.
- the conductive member includes a flaky conductive filler and a conductive material different from the flaky conductive filler.
- the conductive filler having an aspect ratio of 2 or more and 200 or less, and the conductive filler are materials and sizes. And at least one of the shapes includes different conductive materials.
- the aspect ratio of the flaky conductive filler is preferably 3 or more.
- the aspect ratio is preferably 150 or less, more preferably 100 or less, and still more preferably 50 or less.
- the conductive material different from the flaky conductive filler may be a conductive material that is different from the flaky conductive filler in at least one of material, size, and shape, and the flaky conductive filler has a size and / or shape. Different conductive materials are preferred.
- the flaky conductive filler and the flaky conductive filler contain a different conductive material.
- the conductive material different from the flaky conductive filler has a size of 1 ⁇ 2 or less of the size of the flaky conductive filler and / or a spherical conductive filler.
- the size means an average volume per one conductive material or filler.
- the spherical conductive filler means that the aspect ratio is 1 or more and less than 2.
- the aspect ratio is more preferably 1.5 or less.
- the aspect ratio of the conductive filler is a value obtained by dividing the major axis (dimension of the longest part) by the minor axis (dimension of the shortest part).
- the major axis and minor axis are major axes of 100 or more fillers using an electron microscope. And measuring the minor axis.
- peaks are observed at two locations of a range of 1 or more and less than 2, and a range of 2 or more and 200 or less, it can be said that spherical conductive fillers and flaky conductive fillers are included. .
- it is preferable that peaks are observed only in two places, a range of 1 or more and less than 2, and a range of 2 or more and 200 or less.
- the transparent conductive film on the CF substrate side of the liquid crystal display panel of each embodiment is disposed on the entire front or back surface of the CF substrate, and this is a preferable form from the viewpoint of sufficiently removing static electricity from the CF substrate.
- the film may be disposed only on a part of the front surface or the back surface of the CF substrate (for example, a portion corresponding to the display area).
- the neutralization terminal portion on the TFT substrate side of the liquid crystal display panel of each embodiment is disposed on the back surface (observation surface side main surface) of the TFT substrate.
- the location is not particularly limited, and for example, it may be disposed on the surface of the TFT substrate (backlight side main surface), or may be disposed on the side surface of the TFT substrate.
- FIG. 1 is a schematic cross-sectional view of the liquid crystal display panel of the first embodiment.
- the liquid crystal display panel shown in FIG. 1 is a horizontal electric field type liquid crystal display panel, and does not have electrodes for driving liquid crystal on the CF substrate 21.
- a transparent conductive film 23 (for example, ITO) formed on the surface of the CF substrate 21 and the static elimination terminal portion 13 of the TFT substrate 11 are connected by a conductive paste 40.
- the static elimination terminal portion 13 includes a gate metal 13a, a gate insulating film 13c, a source metal 13e, a first inorganic insulating film 13g, an organic insulating film 13i, a second inorganic insulating film 13k, and a transparent conductive film 13m having high surface smoothness (for example, IZO). Etc.) are laminated in this order, and the surface connected to the conductive paste 40 is made of a transparent conductive film 13m (for example, IZO) having high surface smoothness.
- a transparent conductive film 13m for example, IZO
- the gate metal 13a is a wiring material formed in the same layer as the gate electrode of the TFT on the TFT substrate 11, for example, Cu (copper), Mo (molybdenum), Al (aluminum), Ti (titanium). TiN (titanium nitride), an alloy thereof, or a laminated film of these metals.
- the source metal 13e is a wiring material formed in the same layer as the source / drain electrodes of the TFT, and is formed of, for example, Cu, Mo, Al, Ti, TiN, an alloy thereof, or a laminated film of these metals. .
- the organic insulating film 13i is an insulating layer formed in the same layer as the organic insulating layer disposed between the TFT and the common electrode
- the second inorganic insulating film 13k is an insulating film between the common electrode and the pixel electrode. It is an insulating layer formed in the same layer.
- the transparent conductive film 13m having high surface smoothness is an electrode material formed in the same layer as the pixel electrode, and is formed of a transparent conductive film such as IZO, for example.
- fine (for example, about 2 to 4 ⁇ m) slits may be formed in a pixel electrode at a narrow pitch (for example, about 2 to 4 ⁇ m).
- the pixel electrode including the slit and the transparent conductive film 13m having high surface smoothness of the static elimination terminal portion 13 are formed by forming the IZO film by sputtering, and then performing the same process using a known photolithography method and wet etching. Can be used for patterning.
- an opaque metal electrode such as Mo or Ti can be used, but using a transparent conductive film such as IZO has a higher transmittance of the liquid crystal panel.
- the configuration in which the pixel electrode, the second inorganic insulating film 13k, and the common electrode are formed in this order from the side close to the liquid crystal layer side is shown.
- the positions of the pixel electrode and the common electrode can be reversed. It is.
- the fine slit is formed in the common electrode
- the transparent conductive film 13m having high surface smoothness is an electrode material formed in the same layer as the common electrode.
- FIG. 1 there are conductive paths in the order of a transparent conductive film 23, a conductive paste 40, a transparent conductive film 13m with high surface smoothness, a source metal 13e, and a gate metal 13a.
- the gate metal 13a is, for example, an end of the TFT substrate 11 It is grounded via an FPC (Flexible Printed Circuit) connected to.
- FPC Flexible Printed Circuit
- the transparent conductive film 23 may be made of IZO and have high surface smoothness
- the transparent conductive film 13m may be made of ITO and have low surface smoothness, and the effects of the present invention can be exhibited similarly.
- the transparent conductive film 23 and the transparent conductive film 13m may each be comprised from IZO, and the effect of this invention will become more remarkable by this.
- the transparent conductive film 23 and the transparent conductive film 13m may each be made of ITO.
- High surface smoothness means that the surface roughness Ra is preferably 3 nm or less, more preferably 2 nm or less, and even more preferably 1 nm or less. Thereby, the effect of this invention can be exhibited notably.
- the surface roughness Ra refers to the arithmetic average roughness measured based on the standard of JIS B 0601: 2001.
- SiN x silicon nitride
- the gate insulating film 13c the first inorganic insulating film 13g, and the second inorganic insulating film 13k.
- an acrylic photosensitive resin can be suitably used as the organic insulating film 13i.
- FIG. 2 is a partially enlarged view of FIG. 1 and shows a state before and after the high temperature and high humidity test.
- FIG. 2 shows a part of each of the transparent conductive film 13m with high surface smoothness and the conductive paste 40 shown in FIG.
- the conductive paste 40 is composed of a conductive material different from the flaky conductive filler such as the flaky conductive filler 40f and the spherical conductive filler 40s, and a binder 40r (resin).
- the surface of the static elimination terminal portion 13 is composed of a conductive film having high surface smoothness (for example, IZO or the like), which is a preferred form, but it may be composed of other conductive materials. good.
- the conductive paste 40 applied to the conductive film by using a material obtained by mixing a flaky conductive filler 40f and a conductive material different from the flaky conductive filler such as the spherical conductive filler 40s in the binder 40r, The effect of sustaining a stable and stable electric resistance value can be exhibited.
- the conductive film is a conductive film having high surface smoothness such as IZO, the electrical resistance value sustainability can be greatly improved.
- the conductive paste is a mixture of a flaky conductive filler and a conductive material different from the flaky conductive filler, such as a spherical conductive filler, in a binder.
- a flaky conductive filler and a spherical conductive filler are mixed in a binder.
- the conductive paste include a paste composed of a flaky conductive filler having a large surface area and a spherical conductive filler having a small surface area.
- the size of the conductive material different from the flaky conductive filler is preferably 1/2 or less, more preferably 1/3 or less of the size of the flaky conductive filler.
- the size means an average volume per one conductive material or filler.
- the conductive filler material examples include silver, gold, iron, and carbon.
- Suitable materials for the flaky conductive filler 40f include silver, gold, and the like.
- carbon is preferable.
- the volume-based content ratio between the flaky conductive filler and the conductive material different from the flaky conductive filler is preferably 10/90 to 90/10, and preferably 20/80 to 80/20. More preferably, it is more preferably 30/70 to 70/30, and particularly preferably 40/60 to 60/40.
- the binder used for the conductive paste conventionally known various resins can be used.
- an epoxy resin, a phenol resin, and a silicon resin are preferable.
- the liquid crystal panel of Embodiment 1 has, as a basic configuration, a TFT substrate 11, a liquid crystal layer 30 containing liquid crystal molecules having positive dielectric anisotropy or negative dielectric anisotropy, and a CF substrate 21.
- the TFT substrate 11 and the CF substrate 21 are bonded together with a sealing material 35 interposed therebetween.
- Polarizing plates are respectively provided on the outer surface sides of the TFT substrate 11 and the CF substrate 21.
- An alignment film may be provided on the liquid crystal layer side of each of the TFT substrate 11 and the CF substrate 21. Description of the polarizing plate and the alignment film is omitted in FIG.
- the CF substrate is provided with a CF (color filter), the CF substrate does not have to be provided as long as it is a counter substrate of the TFT substrate, and the TFT substrate is provided with CF. It does not matter.
- FIG. 3 is a graph of resistance value ( ⁇ ) with respect to time (h) when the high-temperature and high-humidity test is performed on the liquid crystal display panel of Embodiment 1.
- the horizontal electric field type liquid crystal display panel of FIG. 1 was put into an environmental test of high temperature and high humidity (conditions: 60 ° C., 95% RH [relative humidity]), and the transparent conductive film 23 (ITO) of FIG. 1 was used. ) To the gate metal 13a (between the arrows), the electrical resistance value was measured.
- FIG. 1 The horizontal electric field type liquid crystal display panel of FIG. 1 was put into an environmental test of high temperature and high humidity (conditions: 60 ° C., 95% RH [relative humidity]), and the transparent conductive film 23 (ITO) of FIG. 1 was used.
- ITO transparent conductive film 23
- FIG. 3 is a graph in the case of using a conductive paste in which a flaky conductive filler (flaky silver particles are used) and a spherical conductive filler (carbon particles are used) are mixed with a binder.
- a flaky conductive filler flaky silver particles are used
- a spherical conductive filler carbon particles are used
- FIG. 3 shows the respective results. The same applies to FIG. 6 (Comparative Example 1) and FIG. 9 (Comparative Example 2) described later.
- the liquid crystal display panel of Comparative Example 1 is the same as the liquid crystal display panel of Embodiment 1 except that a conductive paste in which only a spherical conductive filler (spherical silver particles) is mixed in a binder is used as the conductive filler.
- FIG. 4 is a schematic cross-sectional view of the liquid crystal display panel of Comparative Example 1 before the high-temperature and high-humidity test.
- FIG. 5 is a schematic cross-sectional view of the liquid crystal display panel of Comparative Example 1 after a high-temperature and high-humidity test. In the liquid crystal display panel of Comparative Example 1, as shown in FIGS.
- the spherical conductive fillers 140s that are only in point contact with each other move with the deformation of the binder 140r as time passes, Therefore, it is considered that the point contact between the spherical conductive fillers 140s is deviated and conduction is impaired.
- FIG. 6 is a graph of resistance value ( ⁇ ) with respect to time (h) when the high-temperature and high-humidity test is performed on the liquid crystal display panel of Comparative Example 1.
- the liquid crystal display panel of Comparative Example 1 was put into an environmental test of high temperature and high humidity (conditions: 60 ° C., 95% RH [relative humidity]), and the electrical resistance value between the transparent conductive film on the CF substrate and the gate metal was measured. It was measured.
- FIG. 6 shows that the electrical resistance value increases with time.
- the liquid crystal display panel of Comparative Example 2 is the same as the liquid crystal display panel of Embodiment 1 except that a conductive paste in which only a flaky conductive filler (flaky silver particles) is mixed in a binder is used as the conductive filler.
- FIG. 7 is a schematic cross-sectional view of the liquid crystal display panel of Comparative Example 2 before the high-temperature and high-humidity test.
- FIG. 8 is a schematic cross-sectional view of the liquid crystal display panel of Comparative Example 2 after a high-temperature and high-humidity test. In the liquid crystal display panel of Comparative Example 2, as shown in FIGS.
- the flaky conductive fillers 240 f that are in surface contact with each other move with the deformation of the binder 240 r as time passes, and the conductive paste 240. It is considered that the surface contact between the flaky conductive fillers 240f is deviated and the conduction is impaired.
- FIG. 9 is a graph of resistance value ( ⁇ ) with respect to time (h) when the high-temperature and high-humidity test is performed on the liquid crystal display panel of Comparative Example 2.
- the liquid crystal display panel of Comparative Example 2 was put into an environmental test of high temperature and high humidity (conditions: 60 ° C., 95% RH [relative humidity]), and the electrical resistance value between the transparent conductive film on the CF substrate and the gate metal was measured. It was measured.
- FIG. 9 shows that the electrical resistance value increases with time.
- FIG. 10 is a schematic cross-sectional view of the liquid crystal display panel of the second embodiment.
- FIG. 10 shows an embodiment of a horizontal electric field mode liquid crystal display panel of an in-cell touch panel in which a part of electrodes for a touch panel is mounted on a CF substrate.
- the liquid crystal display panel of Embodiment 2 includes a TFT substrate 311; a TFT substrate side sensor electrode 315; a liquid crystal layer 330; a layer composed of a red color filter R, a green color filter G, a blue color filter B, and a black mask BM; 321; CF substrate side sensor electrode 325 (transparent conductive film) is laminated in this order.
- the CF substrate side sensor electrode 325 is formed on the surface (surface) of the CF substrate 321 opposite to the liquid crystal layer side.
- a static elimination terminal portion 313 is disposed on the TFT substrate 311, and the conductive paste 340 is electrically connected between the static elimination terminal portion 313 and the CF substrate side sensor electrode 325.
- a sealant 335 is disposed between the pair of substrates.
- the TFT substrate side sensor electrode 315 for example, a common electrode for aligning (driving) liquid crystal molecules can be used.
- the CF substrate side sensor electrode 325 is for a touch panel, and the static elimination terminal portion 313 is provided between the TFT substrate side sensor electrode 315 and the CF substrate side sensor electrode 325 via, for example, an FPC connected to the end of the TFT substrate 311. Is connected to a circuit for detecting the touch position.
- the touch position is detected using the capacitance of the portion between the TFT substrate side sensor electrode 315 and the CF substrate side sensor electrode 325.
- the sensor electrode is formed on the TFT substrate 311.
- the sensor electrode may be formed on the surface (back surface) of the CF substrate 321 on the liquid crystal layer side.
- the touch position is detected by using the capacitance between the sensor electrodes formed on the front surface and the back surface, respectively.
- FIG. 11 is a partially enlarged view (two places) of FIG.
- a conductive paste 340 in which a flaky conductive filler 340f similar to the conductive paste of the first embodiment and a conductive material different from the flaky conductive filler such as a spherical conductive filler 340s are mixed in a binder 340r is used.
- a good electrical connection can be obtained.
- a transparent conductive film with high surface smoothness such as IZO is used for the conductive film 313m and / or the CF substrate side sensor electrode 325 on the surface of the static elimination terminal portion, the electrical connection can be greatly improved. .
- liquid crystal display panel of the second embodiment a stable electrical resistance value of 5 k ⁇ or less can be achieved as in the case shown in FIG. 3, and good contact performance can be obtained.
- Other configurations of the liquid crystal display panel of the second embodiment are the same as those of the liquid crystal display panel of the first embodiment described above.
- FIG. 12 is a schematic cross-sectional view of the liquid crystal display panel of the third embodiment.
- FIG. 12 shows a transparent liquid crystal display panel in an IPS mode or FFS mode in which a transparent conductive film 422 (ITO, IZO, etc.) is provided on the back surface of the CF substrate 421, and a conductive paste 440 is used as a part of the sealing material.
- a transparent conductive film 422 ITO, IZO, etc.
- a conductive paste 440 is used as a part of the sealing material.
- Embodiment which electrically connects the conductive layer 422 and the static elimination terminal part 413 is shown.
- the transparent conductive film is provided on the surface of the CF substrate to remove static electricity.
- the third embodiment is transparent on the back surface (surface on the liquid crystal layer side) of the CF substrate.
- a conductive film 422 is provided to remove static electricity. Note that since the transparent conductive film 422 is not an electrode for driving the liquid crystal connected to the TFT, the transparent conductive film 422 and the charge removal terminal portion 413 are electrically connected using the conductive paste 440 in order to prevent charging. Will be connected.
- a conductive filler (as a material, silver particles, gold particles, carbon particles, etc.) is mixed into a part of a sealing material that bonds a pair of substrates and seals the liquid crystal layer 430, so that CF
- the transparent conductive film 422 of the substrate 421 and the static elimination terminal portion 413 of the TFT substrate 411 are electrically connected.
- the flaky conductive filler 440f and the spherical conductive filler 440s that are the same as the conductive paste of the first embodiment are used.
- a conductive paste 440 in which a conductive material different from the flaky conductive filler is mixed in a binder 440r is used. Note that spacers 431b and 431s are arranged between the pair of substrates.
- the liquid crystal display panel of Embodiment 3 includes a TFT substrate 411, a liquid crystal layer 430, a red color filter R, a green color filter G, a blue color filter B, and a colored layer including a black mask BM, a transparent conductive film 422, and a CF substrate 421.
- a neutralization terminal portion 413 is disposed on the TFT substrate 411, and the conductive paste 440 is electrically connected between the neutralization terminal portion 413 and the transparent conductive film 422.
- the conductive paste 440 also has a function as a sealing material. Further, a seal member 435 having no electrical conductivity is disposed at a location where the static elimination terminal portion 413 is not disposed.
- FIG. 13 is a partially enlarged view of FIG. Also in Embodiment 3, it is possible to exert the effect of the present invention by applying the conductive paste according to the present invention.
- a material having high surface smoothness such as IZO is used on the surface of the transparent conductive film 422 on the CF substrate 421 side or the static elimination terminal portion 413 (transparent conductive film)
- the effect of the present invention is remarkably exhibited. it can.
- a stable electrical resistance value of 5 k ⁇ or less can be achieved as in the case shown in FIG. 3, and good contact performance can be obtained.
- Other configurations of the liquid crystal display panel of the third embodiment are the same as those of the liquid crystal display panel of the first embodiment described above.
- the third embodiment can also be applied to the configuration shown in the second embodiment in which the sensor electrode for the in-cell touch panel is formed on the liquid crystal layer side surface (back surface) of the CF substrate.
- the transparent conductive film 422 corresponds to a sensor electrode
- the conductive paste 440 is electrically connected between the static elimination terminal portion 313 and the sensor electrode.
- the static elimination terminal part 313 is connected with the circuit which detects a touch position, for example via FPC connected to the TFT substrate 411 edge part.
- the conductive paste 440 may be arranged at a position different from the sealing material.
- the binder of the conductive paste may be a material different from the sealing material.
- the liquid crystal display panel of the present invention is suitably used for in-vehicle devices such as car navigation, electronic books, photo frames, industrial equipment, televisions, personal computers, smartphones, tablet terminals and the like. Further, the present invention is suitable for a horizontal electric field type liquid crystal display panel in which an electrode for controlling the alignment of liquid crystal is provided only on the second substrate and is not provided on the first substrate. Thereby, it is possible to stably remove the charge on the first substrate, which is likely to occur in a liquid crystal display panel in which the liquid crystal alignment control electrode is not provided on the first substrate.
- the present invention is preferably applied to an IPS mode liquid crystal display panel and an FFS mode liquid crystal display panel.
- the second substrate includes a plurality of thin film transistor elements, a plurality of pixel electrodes respectively connected to the plurality of thin film transistor elements, and a common electrode. It is preferable to control the alignment direction of the liquid crystal molecules by an electric field generated between the electrode and the common electrode in a direction parallel to the second substrate surface.
- the surface of the static elimination terminal portion is formed of the same material as the electrode closer to the liquid crystal layer among the pixel electrode and the common electrode.
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Abstract
Description
横電界方式の液晶表示パネルでは、共通電極は画素電極と共にTFT基板に形成され、画素電極と共通電極とを用いて液晶層に概ね横方向(基板面に平行方向)の電界が印加される。横電界方式の液晶パネルとしては、正又は負の誘電率異方性を有する液晶分子を基板面に対して水平配向させて液晶層に対し横電界を印加する面内スイッチング(IPS:In-Plane Switching)モード、フリンジ電界スイッチング(FFS:Fringe Field Switching)モード等が挙げられる。
以下に、本発明を詳述する。
本発明の液晶表示パネルにおいて、上記第1基板の透明導電膜、及び、上記第2基板の端子部の少なくとも一方は、表面粗さRaが3nm以下であることが好ましく、2nm以下であることがより好ましく、1nm以下であることが更に好ましい。
表面粗さRaは、JIS B 0601:2001に規定される方法により測定することができる。
すなわち、本発明の液晶表示パネルにおける上記第2基板は、複数の薄膜トランジスタ素子と、該複数の薄膜トランジスタ素子にそれぞれ接続された複数の画素電極と、共通電極を備え、第2基板面に対して平行方向の電界によって液晶分子の配列方向を制御して表示を行うときに、該複数の画素電極と該共通電極との間に電位差を生じさせる横電界方式の液晶パネルであることが好ましい。
上記平行方向の電界は、横電界方式の液晶パネルの技術分野において横電界と呼ばれるものであればよく、概ね平行方向の電界であればよい。
本明細書中、導電ペースト(導電性接着剤とも言う)は、液晶表示パネルの一方の基板の透明導電膜と他方の基板の除電端子部との間を電気的に接続した後に硬化されたものも含む。
本明細書中、フレーク状導電フィラーは、アスペクト比が2以上、200以下であることを言う。なお、導電性部材がフレーク状導電フィラー及び該フレーク状導電フィラーとは異なる導電性材料を含むとは、アスペクト比が2以上、200以下である導電フィラーと、該導電フィラーとは材料、大きさ、形状の少なくとも1つが異なる導電性材料とを含むことを言う。
フレーク状導電フィラーのアスペクト比は、3以上であることが好ましい。また、該アスペクト比は、150以下であることが好ましく、100以下であることがより好ましく、50以下であることが更に好ましい。
フレーク状導電フィラーとは異なる導電性材料は、フレーク状導電フィラーとは材料、大きさ、形状の少なくとも1つが異なる導電性材料であればよく、フレーク状導電フィラーとは大きさ及び/又は形状が異なる導電性材料であることが好ましい。
「フレーク状導電フィラーとは大きさ及び/又は形状が異なる」に関し、大きさを示す指標(例えば、平均体積)や形状を示す指標(例えば、アスペクト比)の分布図において、フレーク状導電フィラーに対応するピークと、該ピークとは異なるピークとの2種類のピークが観測されれば、フレーク状導電フィラーとフレーク状導電フィラーとは異なる導電性材料とを含んでいると言える。
例えば、フレーク状導電フィラーとは異なる導電性材料は、その大きさがフレーク状導電フィラーの大きさの1/2以下であるか、及び/又は、球状導電フィラーであることがより好ましい。ここで、大きさとは、導電性材料又はフィラー1個当たりの平均体積を意味する。
球状導電フィラーは、アスペクト比が1以上、2未満であることを言う。該アスペクト比は、1.5以下であることがより好ましい。
導電フィラーのアスペクト比は、長径(最も長い部分の寸法)を短径(最も短い部分の寸法)で割った値であり、長径及び短径は、電子顕微鏡を用いて100個以上のフィラーの長径と短径を測定することで求められる。
アスペクト比の分布図において、1以上、2未満の範囲と、2以上、200以下の範囲との2箇所にピークが観測されれば、球状導電フィラーとフレーク状導電フィラーとを含んでいると言える。アスペクト比の分布図において、1以上、2未満の範囲と、2以上、200以下の範囲との2箇所だけにピークが観測されることが好ましい。
各実施形態の液晶表示パネルのTFT基板側の除電端子部は、TFT基板の裏面(観察面側主面)に配置されているが、接地されることにより除電する機能を発揮出来る限り、その配置箇所は特に限定されず、例えば、TFT基板の表面(バックライト側主面)に配置されるものであってもよく、TFT基板の側面に配置されるものであっても構わない。
図1は、実施形態1の液晶表示パネルの断面模式図である。図1で示す液晶表示パネルは、横電界方式の液晶表示パネルであり、CF基板21に液晶を駆動するための電極を有さない。
CF基板21の表面に形成された透明導電膜23(例えばITO等)と、TFT基板11の除電端子部13とが導電ペースト40で接続されている。除電端子部13は、ゲートメタル13a、ゲート絶縁膜13c、ソースメタル13e、第1無機絶縁膜13g、有機絶縁膜13i、第2無機絶縁膜13k、表面平滑性の高い透明導電膜13m(例えばIZO等)がこの順で積層されて構成され、導電ペースト40と接続される表面は表面平滑性の高い透明導電膜13m(例えばIZO等)から構成されている。ここで、ゲートメタル13aとはTFT基板11上のTFTのゲート電極と同じ層に形成される配線材料であり、例えば、Cu(銅)、Mo(モリブデン)、Al(アルミニウム)、Ti(チタン)、TiN(窒化チタン)、これらの合金、あるいは、これら金属の積層膜で形成される。ソースメタル13eとはTFTのソース・ドレイン電極と同じ層に形成される配線材料であり、例えば、Cu、Mo、Al、Ti、TiN、これらの合金、あるいは、これら金属の積層膜で形成される。有機絶縁膜13iは、TFTと共通電極の間に配置される有機絶縁層と同じ層に形成される絶縁層であり、第2無機絶縁膜13kは、共通電極と画素電極の間の絶縁膜と同じ層に形成される絶縁層である。
また、表面平滑性の高い透明導電膜13mは、画素電極と同じ層に形成される電極材料であり、例えばIZOなどの透明導電膜で形成される。横電界方式の液晶パネルでは、画素電極に微細な(例えば2~4μm程度)のスリットを、狭いピッチ(例えば2~4μm程度)で形成する場合がある。このスリットを含む画素電極と、除電端子部13の表面平滑性の高い透明導電膜13mは、スパッタリング法によってIZO膜を製膜した後、公知のフォトリソグラフィ法とウエットエッチングを用いて、同じ工程を用いてパターニングすることができる。なお、横電界方式の液晶パネルの画素電極としては、MoやTiなどの不透明な金属電極を用いることもできるが、IZOのような透明導電膜を用いたほうが、液晶パネルの透過率が高いというメリットがある。
このように、除電端子部13を、TFTや画素電極と同じ層、同じ工程で形成すると、除電端子部13を形成するための追加の工程が不要である。
本実施形態1では、液晶層側に近い側から、画素電極、第2無機絶縁膜13k、共通電極の順に形成される構成を示したが、画素電極と共通電極の位置は逆の構成も可能である。この場合、微細なスリットは共通電極に形成され、表面平滑性の高い透明導電膜13mは、共通電極と同じ層に形成される電極材料となる。
図1中、透明導電膜23、導電ペースト40、表面平滑性の高い透明導電膜13m、ソースメタル13e、ゲートメタル13aの順で導電経路があり、ゲートメタル13aは、例えば、TFT基板11端部に接続されたFPC(Flexible Printed Circuit)を介して接地されている。
表面粗さRaとは、JIS B 0601:2001の規格に基づいて測定された算術平均粗さをいう。
導電ペースト40は、フレーク状導電フィラー40f、球状導電フィラー40s等のフレーク状導電フィラーとは異なる導電性材料、及び、バインダー40r(樹脂)から構成されている。実施形態1では、除電端子部13の表面は、表面平滑性の高い導電膜(例えば、IZO等)で構成されており、これが好ましい形態であるが、その他の導電性材料で構成されていても良い。
本発明では、導電膜に塗布する導電ペースト40として、フレーク状導電フィラー40fと、球状導電フィラー40s等のフレーク状導電フィラーとは異なる導電性材料とをバインダー40rに混合した材料を用いることにより、耐環境性に強く安定した電気抵抗値を持続する効果を発揮できる。特に、導電膜がIZO等の表面平滑性の高い導電膜である場合に、電気抵抗値の持続性能を大きく改善することができる。
またフレーク状導電フィラーとは異なる導電性材料の大きさは、フレーク状導電フィラーの大きさの1/2以下であることが好ましく、1/3以下であることがより好ましい。
ここで、大きさとは、導電性材料又はフィラー1個当たりの平均体積を意味する。
これにより、フレーク状導電フィラー40fの間を球状導電フィラー40s等のフレーク状導電フィラーとは異なる導電性材料でより好適に埋めることができるので、環境試験においてバインダー40r(樹脂)が変形した場合でも、フレーク状導電フィラー40f、球状導電フィラー40s等のフレーク状導電フィラーとは異なる導電性材料が動き難くなる。そのため、導電ペースト内でフレーク状導電フィラー40f、球状導電フィラー40s等のフレーク状導電フィラーとは異なる導電性材料間の導通が保持される。また、特にIZO等の表面平滑性の高い材料から構成される導電膜上において、導電ペースト40の、表面平滑性の高い導電膜13mからの剥離が抑制され、導電ペースト40と表面平滑性の高い導電膜13mとの導通が保持される。
上記フレーク状導電フィラーと上記フレーク状導電フィラーとは異なる導電性材料との体積基準の含有比は、10/90~90/10であることが好ましく、20/80~80/20であることがより好ましく、30/70~70/30であることが更に好ましく、40/60~60/40であることが特に好ましい。
図1の横電界方式の液晶表示パネルを、高温高湿(条件:60℃、95%RH〔相対湿度〕)の環境試験に投入して、図1の透明導電膜23(ITOを使用した。)からゲートメタル13aまでの間(両矢印で示した間)の電気抵抗値を測定した。
図3は、フレーク状導電フィラー(フレーク状銀粒子を使用した。)と、球状の導電フィラー(カーボン粒子を使用した。)とをバインダーと混合した導電ペーストを用いた場合のグラフである。後述する比較例1、比較例2とは異なり、時間が経過しても、電気抵抗値の上昇は見られなかった(高温高湿試験を通じて5kΩ以下の電気抵抗値が維持された。)。このように電気抵抗値が2MΩ以下であれば、良好なコンタクト性能(電気的接続性能)が得られる。
なお、環境試験は同一の高温高湿条件で複数回行い、図3ではそれぞれの結果を示している。後述する図6(比較例1)、図9(比較例2)においても同様である。
比較例1の液晶表示パネルは、導電フィラーとして球状導電フィラー(球状銀粒子)のみをバインダーに混入した導電ペーストを使用した以外は実施形態1の液晶表示パネルと同様である。
図4は、比較例1の液晶表示パネルの高温高湿試験前の断面模式図である。図5は、比較例1の液晶表示パネルの高温高湿試験後の断面模式図である。比較例1の液晶表示パネルでは、図4及び図5に示されるように、時間経過につれ、バインダー140rの変形に伴って、互いに点接触のみしている球状導電フィラー140sが動き、導電ペースト140内で球状導電フィラー140s間の点接触が乖離して導通が損なわれると考えられる。
比較例2の液晶表示パネルは、導電フィラーとしてフレーク状導電フィラー(フレーク状銀粒子)のみをバインダーに混入した導電ペーストを使用した以外は実施形態1の液晶表示パネルと同様である。
図7は、比較例2の液晶表示パネルの高温高湿試験前の断面模式図である。図8は、比較例2の液晶表示パネルの高温高湿試験後の断面模式図である。比較例2の液晶表示パネルでは、図7及び図8に示されるように、時間経過につれ、バインダー240rの変形に伴って、互いに面接触のみしているフレーク状導電フィラー240fが動き、導電ペースト240内でフレーク状導電フィラー240f間の面接触が乖離して導通が損なわれると考えられる。
図10は、実施形態2の液晶表示パネルの断面模式図である。図10は、タッチパネル用の電極の一部を、CF基板に搭載したインセルタッチパネルの横電界方式液晶表示パネルの実施形態を示す。
実施形態2の液晶表示パネルは、TFT基板311;TFT基板側センサー電極315;液晶層330;赤色カラーフィルタR、緑色カラーフィルタG、青色カラーフィルタB、及び、ブラックマスクBMからなる層;CF基板321;CF基板側センサー電極325(透明導電膜)がこの順で積層されて構成されている。すなわちCF基板側センサー電極325は、CF基板321の液晶層側と反対側の面(表面)に形成されている。TFT基板311上には除電端子部313が配置されており、除電端子部313とCF基板側センサー電極325との間を導電ペースト340が電気的に接続している。一対の基板間にシール材335が配置されている。TFT基板側センサー電極315としては、例えば、液晶分子を配向(駆動)するための共通電極を使用することができる。なお、CF基板側センサー電極325は、タッチパネル用であり、除電端子部313は、例えばTFT基板311端部に接続されたFPCを介して、TFT基板側センサー電極315-CF基板側センサー電極325間のタッチ位置を検出する回路と接続される。TFT基板側センサー電極315とCF基板側センサー電極325との間の部分の容量を利用してタッチ位置を検出する。
なお、本実施形態2では、センサー電極をTFT基板311に形成する構成を示したが、センサー電極をCF基板321の液晶層側の面(裏面)に形成してもよく、この場合、CF基板の表面と裏面とにそれぞれ形成されたセンサー電極の間の容量を利用してタッチ位置を検出する。
実施形態2の液晶表示パネルでは、図3で示したのと同様に、5kΩ以下の安定した電気抵抗値を達成でき、良好なコンタクト性能が得られる。
実施形態2の液晶表示パネルのその他の構成は、上述した実施形態1の液晶表示パネルの構成と同様である。
図12は、実施形態3の液晶表示パネルの断面模式図である。図12は、IPSモード又はFFSモードの液晶表示パネルにおいてCF基板421の裏面に透明導電膜422(ITO、IZO等)を設け、シール材の一部に導電ペースト440を使用し、CF基板の透明導電層422と除電端子部413とを電気的に接続する実施形態を示す。上述した実施形態1、実施形態2は、CF基板の表面に透明導電膜を設けて静電気を除去する構成であったが、実施形態3は、CF基板の裏面(液晶層側の面)に透明導電膜422を設けて静電気を除去する構成である。なお、透明導電膜422は、TFTと接続された液晶を駆動するための電極ではないことから、帯電を防止するためには透明導電膜422と除電端子部413とを導電ペースト440を用いて電気的に接続することとなる。この構成においては、一対の基板を接着し、かつ液晶層430を封止するシール材の一部に導電フィラー(材質としては、銀粒子、金粒子、カーボン粒子等)を混入することで、CF基板421の透明導電膜422とTFT基板411の除電端子部413とを電気的に接続する。実施形態3では、透明導電膜422と除電端子部413とを電気的に接続する部分(導電ペースト440)において、実施形態1の導電ペーストと同様のフレーク状導電フィラー440fと球状導電フィラー440s等のフレーク状導電フィラーとは異なる導電性材料とをバインダー440rに混合した導電ペースト440を使用する。なお、一対の基板間には、スペーサー431b、431sが配置されている。
実施形態3の液晶表示パネルでは、図3に示したのと同様に、5kΩ以下の安定した電気抵抗値を達成でき、良好なコンタクト性能が得られる。
実施形態3の液晶表示パネルのその他の構成は、上述した実施形態1の液晶表示パネルの構成と同様である。
なお、本実施形態3は、本実施形態2で示した、インセルタッチパネル用のセンサー電極をCF基板の液晶層側の面(裏面)に形成する構成に対しても適用可能である。この場合、透明導電膜422はセンサー電極に相当し、除電端子部313とセンサー電極との間を導電ペースト440が電気的に接続している。除電端子部313は、例えばTFT基板411端部に接続されたFPCを介して、タッチ位置を検出する回路と接続される。
また、本実施形態3では、シール材の一部に導電ペースト440を使用する例を示したが、シール材とは異なる位置に、導電ペースト440を配置しても良い。この場合、導電性ペーストのバインダーは、シール材とは異なる材料であっても良い。
また本発明は、液晶の配向制御用の電極が第2基板のみに設けられ、第1基板に設けられない形態の横電界方式の液晶表示パネルに好適である。これにより、液晶の配向制御用の電極が第1基板に設けられていない液晶表示パネルにおいて発生しやすい第1基板における帯電を安定的に除去することができる。例えば、本発明は、IPSモードの液晶表示パネル、FFSモードの液晶表示パネルに適用されることが好ましい。例えば、本発明の液晶表示パネルにおいて、第2基板には、複数の薄膜トランジスタ素子と、該複数の薄膜トランジスタ素子にそれぞれ接続された複数の画素電極と、共通電極が備えられており、該複数の画素電極と該共通電極との間に生じる、第2基板面に対して平行方向の電界によって、液晶分子の配列方向を制御することが好ましい。
また、本発明の液晶表示パネルにおいて、除電端子部の表面が、画素電極、及び、共通電極のうちで液晶層に近い側の電極と同じ材料で形成されていることがより好ましい。
13、313、413:除電端子部
13a:ゲートメタル
13c:ゲート絶縁膜
13e:ソースメタル
13g:第1無機絶縁膜
13i:有機絶縁膜
13k:第2無機絶縁膜
13m、113m、213m、313m:表面平滑性の高い透明導電膜
21、321、421:CF基板
23、422:透明導電膜
30、330、430:液晶層
35、335、435:シール材
40、140、240、340、440:導電ペースト
40f、240f、340f、440f:フレーク状導電フィラー
40r、140r、240r、340r:バインダー
40s、140s、340s、440s:球状導電フィラー
315:TFT基板側センサー電極
325:CF基板側センサー電極
431b、431s:スペーサー
R:赤色カラーフィルタ
G:緑色カラーフィルタ
B:青色カラーフィルタ
BM:ブラックマスク
Claims (12)
- 透明導電膜を有する第1基板と、
表面が導電性である端子部を有する第2基板と、
該第1基板及び該第2基板に挟持された液晶層と、
該透明導電膜と該端子部とを電気的に接続する導電性部材とを有し、
該導電性部材は、フレーク状導電フィラー及び該フレーク状導電フィラーとは異なる導電性材料を含むことを特徴とする液晶表示パネル。 - 前記フレーク状導電フィラーとは異なる導電性材料は、球状導電フィラーである
ことを特徴とする請求項1に記載の液晶表示パネル。 - 前記第1基板の透明導電膜、及び、前記第2基板の端子部の少なくとも一方は、表面粗さRaが3nm以下である
ことを特徴とする請求項1又は2に記載の液晶表示パネル。 - 前記第1基板の透明導電膜、及び、前記第2基板の端子部の表面の少なくとも一方は、酸化インジウム亜鉛から構成されている
ことを特徴とする請求項1~3のいずれかに記載の液晶表示パネル。 - 前記フレーク状導電フィラーとは異なる導電性材料の大きさは、前記フレーク状導電フィラーの大きさの1/2以下である
ことを特徴とする請求項1~4のいずれかに記載の液晶表示パネル。 - 前記フレーク状導電フィラーと前記フレーク状導電フィラーとは異なる導電性材料との体積基準の含有比は、10/90~90/10である
ことを特徴とする請求項1~5のいずれかに記載の液晶表示パネル。 - 前記第1基板の透明導電膜は、タッチパネル用センサー電極である
ことを特徴とする請求項1~6のいずれかに記載の液晶表示パネル。 - 前記導電性部材は、前記第1基板と前記第2基板とを接着し、かつ前記液晶層を封止するシール材である
ことを特徴とする請求項1~7のいずれかに記載の液晶表示パネル。 - 前記透明導電膜は、前記第1基板の液晶層側と反対側の面に設けられている
ことを特徴とする請求項1~8のいずれかに記載の液晶表示パネル。 - 前記透明導電膜は、前記第1基板の液晶層側の面に設けられている
ことを特徴とする請求項1~8のいずれかに記載の液晶表示パネル。 - 前記第2基板には、
複数の薄膜トランジスタ素子と、
該複数の薄膜トランジスタ素子にそれぞれ接続された複数の画素電極と、
共通電極が備えられており、
該複数の画素電極と該共通電極との間に生じる、第2基板面に対して平行方向の電界によって、液晶分子の配列方向を制御する横電界方式の液晶パネルである
ことを特徴とする請求項1~10のいずれかに記載の液晶表示パネル。 - 前記画素電極、及び、前記共通電極は、絶縁膜を介して異なる層に設けられており、
前記端子部の表面は、前記画素電極、及び、前記共通電極のうちで液晶層に近い側の電極と同じ材料で形成されている
ことを特徴とする請求項11に記載の液晶表示パネル。
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- 2016-05-16 US US15/575,966 patent/US20180149896A1/en not_active Abandoned
- 2016-05-16 CN CN201680028330.9A patent/CN107615153A/zh active Pending
- 2016-05-16 WO PCT/JP2016/064408 patent/WO2016186062A1/ja active Application Filing
- 2016-05-16 JP JP2017519200A patent/JPWO2016186062A1/ja active Pending
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JP2014102499A (ja) * | 2012-10-26 | 2014-06-05 | Japan Display Inc | 表示装置及び電子機器 |
US20150124186A1 (en) * | 2013-11-06 | 2015-05-07 | Lg Display Co., Ltd. | Liquid crystal display device and method of manufacturing the same |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019168659A (ja) * | 2018-03-26 | 2019-10-03 | 株式会社ジャパンディスプレイ | 表示装置 |
WO2019187566A1 (ja) * | 2018-03-26 | 2019-10-03 | 株式会社ジャパンディスプレイ | 表示装置 |
JP2020148818A (ja) * | 2019-03-11 | 2020-09-17 | 株式会社ジャパンディスプレイ | 表示装置 |
JP7237665B2 (ja) | 2019-03-11 | 2023-03-13 | 株式会社ジャパンディスプレイ | 表示装置 |
Also Published As
Publication number | Publication date |
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JPWO2016186062A1 (ja) | 2018-03-01 |
CN107615153A (zh) | 2018-01-19 |
US20180149896A1 (en) | 2018-05-31 |
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