WO2017033496A1 - Liquid crystal display device with touch panel - Google Patents

Liquid crystal display device with touch panel Download PDF

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Publication number
WO2017033496A1
WO2017033496A1 PCT/JP2016/062896 JP2016062896W WO2017033496A1 WO 2017033496 A1 WO2017033496 A1 WO 2017033496A1 JP 2016062896 W JP2016062896 W JP 2016062896W WO 2017033496 A1 WO2017033496 A1 WO 2017033496A1
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Prior art keywords
touch panel
liquid crystal
polarizing plate
layer
crystal display
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PCT/JP2016/062896
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French (fr)
Japanese (ja)
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裕司 高橋
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Ｊｘエネルギー株式会社
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Priority to CN201680049150.9A priority Critical patent/CN107924087A/en
Priority to KR1020187004587A priority patent/KR101994052B1/en
Publication of WO2017033496A1 publication Critical patent/WO2017033496A1/en

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    • 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
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to a liquid crystal display device including a touch panel.
  • an out-cell type in which a touch panel is disposed on the liquid crystal display device is widely used (for example, Japanese Patent Application Laid-Open No. 2012-230491 (Patent Document 1)).
  • the out-cell type liquid crystal display device with a touch panel has a so-called bone appearance problem that the touch panel sensor pattern is visible as well as the thickness because the touch panel is stacked on the liquid crystal display device. .
  • an inner cell type liquid crystal display device with a touch panel in which a touch panel is arranged between the front polarizing plate and the liquid crystal layer of the liquid crystal display device has been proposed (for example, JP-A-8-161116 (Patent Document 2)).
  • the touch panel is required to have optical isotropy because the touch panel is disposed on the inner side (liquid crystal layer side) than the front side polarizing plate. Therefore, the polyethylene terephthalate substrate used in the out-cell type liquid crystal display device with a touch panel cannot be used for the inner cell type liquid crystal display device with a touch panel because of its large birefringence (low optical isotropy). It was.
  • a substrate made of a resin having low birefringence such as a cycloolefin polymer substrate as a touch panel substrate.
  • the cycloolefin polymer has low heat resistance
  • the heat treatment cannot be performed at a high temperature, and the conductivity of the transparent electrode is lowered. was there.
  • the cycloolefin polymer substrate is unsuitable as a substrate for a touch panel in a liquid crystal display device with a large-screen inner cell type touch panel.
  • the present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an inner cell type liquid crystal display device with a touch panel, which includes a touch panel having a transparent electrode with excellent conductivity. To do.
  • the present inventors have paid attention to the excellent heat resistance of polyimide, and by using a transparent polyimide substrate as a substrate for touch panel, at a high temperature when forming a transparent electrode. It was found that a touch panel provided with a transparent electrode having excellent conductivity can be obtained.
  • the transparent polyimide substrate has negative C birefringence, there is a problem that display is disturbed if it is used as it is as a substrate for a touch panel of an inner cell type liquid crystal display device with a touch panel.
  • the present inventors combine such a negative C transparent polyimide substrate with a layer having a homeotropic orientation (positive C layer), whereby the negative C property of the transparent polyimide substrate becomes the positive C layer. As a result, the present invention has been completed.
  • the liquid crystal display device with a touch panel of the present invention is A back side polarizing plate; A front-side polarizing plate arranged to face the back-side polarizing plate; A liquid crystal layer disposed between the front polarizing plate and the rear polarizing plate; A touch panel having a negative C transparent polyimide substrate, disposed between the liquid crystal layer and the front-side polarizing plate; A positive C layer arranged next to the touch panel; Is provided.
  • the positive C layer may be disposed between the front-side polarizing plate and the touch panel, or between the liquid crystal layer and the touch panel.
  • the touch panel preferably includes an ITO transparent electrode on the negative C transparent polyimide substrate.
  • an inner cell type liquid crystal display device with a touch panel, which includes a touch panel having a transparent electrode with excellent conductivity.
  • the liquid crystal display device with a touch panel of the present invention is A back side polarizing plate; A front-side polarizing plate arranged to face the back-side polarizing plate; A liquid crystal layer disposed between the front polarizing plate and the rear polarizing plate; A touch panel having a negative C transparent polyimide substrate, disposed between the liquid crystal layer and the front-side polarizing plate; A positive C layer arranged next to the touch panel; An inner cell type liquid crystal display device with a touch panel.
  • the liquid crystal display device with a touch panel of the present invention includes a backlight 1, a back side polarizing plate 2, a liquid crystal layer (liquid crystal display element) 3, and a touch panel 4 having a negative C transparent polyimide substrate. , Positive C layer 5, front side polarizing plate 6, and cover glass 7.
  • the backlight 1 and the cover glass 7 are disposed so as to face each other, and the back side polarizing plate 2 and the front side polarizing plate 6 face each other therebetween.
  • the liquid crystal layer 3 is disposed between the back side polarizing plate 2 and the front side polarizing plate 6, and the touch panel 4 and the positive C layer 5 are positioned next to each other, and the liquid crystal layer 3 and the front side polarizing plate are disposed. 6 is arranged.
  • the positive C layer is disposed between the touch panel 4 and the front polarizing plate 6, that is, next to the front side of the touch panel 4 as shown in FIG. 1.
  • it may be disposed between the liquid crystal layer 3 and the touch panel 4, that is, adjacent to the liquid crystal layer side of the touch panel 4.
  • the touch panel 4 may be a single layer of transparent polyimide substrate (FIGS. 1 and 2) or a double layer (no drawing).
  • the transparent polyimide substrate has two layers, if one transparent polyimide substrate is disposed between the liquid crystal layer 3 and the front-side polarizing plate 6 together with the positive C layer, the other transparent polyimide substrate is combined with the positive C layer. Even if it is arrange
  • the touch panel 4 is not particularly limited as long as it has a negative C transparent polyimide substrate, but usually a transparent electrode is disposed on the surface of the transparent polyimide substrate (the transparent electrode is not shown). ).
  • the transparent electrode is not particularly limited, but an ITO transparent electrode is preferable from the viewpoint of sufficiently utilizing the advantage of using a negative C transparent polyimide substrate as a touch panel substrate.
  • the temperature is high (preferably 180 ° C. or higher). Thus, it becomes possible to form a transparent electrode having excellent conductivity.
  • the negative C transparent polyimide substrate has the following formula: nz ⁇ ny ⁇ nx (Where nx is the maximum main refractive index in the plane of the negative C transparent polyimide substrate for light having a wavelength of 550 nm, and ny is the maximum main refractive index in the plane of the negative C transparent polyimide substrate for light having a wavelength of 550 nm. (The main refractive index in the direction perpendicular to the direction in which it is present, and nz is the main refractive index in the thickness direction of the negative C transparent polyimide substrate for light having a wavelength of 550 nm. It satisfies the refractive index characteristic represented by
  • the retardation Rth (PI) in the thickness direction of the negative C transparent polyimide substrate constituting the touch panel 4 and the retardation Rth (pC) in the thickness direction of the positive C layer 5 with respect to light having a wavelength of 550 nm Is the following formula: ⁇ 10 nm ⁇ Rth (PI) + Rth (pC) ⁇ + 10 nm It is preferable that the condition represented by As a result, the negative C property of the transparent polyimide substrate is sufficiently optically compensated by the positive C layer 5, and display disturbance is further improved.
  • the positive C layer has the following formula: ny ⁇ nx ⁇ nz (Where nx is the maximum principal refractive index in the plane of the positive C layer for light having a wavelength of 550 nm, and ny is the principal in the direction orthogonal to the direction having the maximum principal refractive index in the plane of the positive C layer for light having a wavelength of 550 nm. (Refractive index, nz is the main refractive index in the thickness direction of the positive C layer for light having a wavelength of 550 nm.) It satisfies the refractive index characteristic represented by
  • the in-plane retardation Re and the thickness direction retardation Rth with respect to light having a wavelength of 550 nm have the following formula: 0nm ⁇ Re ⁇ 20nm ⁇ 500 nm ⁇ Rth ⁇ ⁇ 30 nm It is preferable that the condition represented by As a result, the negative C property of the transparent polyimide substrate is sufficiently optically compensated by the positive C layer 5 and the display disturbance tends to be further improved.
  • the transparent polyimide substrate used in the present invention is not particularly limited as long as it has a negative C property.
  • a substrate made of a soluble polyimide described in JP-A-2006-137881, JP-A-2014-156484 examples thereof include a substrate made of polyimide described in the publication, a polyimide film described in JP-A-2014-173071, and the like.
  • the positive C layer used in the present invention is not particularly limited as long as it has a positive C property.
  • a homeotropic alignment liquid crystal film (positive C type position) described in JP-A-2006-337575 is used.
  • a layer formed using a phase difference film is used.
  • the backlight 1, the back side polarizing plate 2, the liquid crystal layer 3, the front side polarizing plate 6, and the cover glass 7 used in the present invention are not particularly limited, and may be a known inner cell type liquid crystal display device with a touch panel. What is used can be appropriately selected and used.
  • the touch panel 4 and the positive C layer 5 are directly adjacent to each other (not through other layers), but through a layer having a known optical isotropy. It may be close.
  • the liquid crystal display device with a touch panel of this invention between the backlight 1 and the back side polarizing plate 2, between the back side polarizing plate 2 and the liquid crystal layer 3, and between the liquid crystal layer 3 and the touch panel 4, it is positive.
  • Another layer may be disposed between the C layer 5 and the front side polarizing plate 6 and between the front side polarizing plate 6 and the cover glass 7.
  • the other layer is not particularly limited as long as it is a layer used for a known inner cell type liquid crystal display device with a touch panel.
  • Such a liquid crystal display device with a touch panel according to the present invention can be manufactured, for example, by the following method.
  • the back side polarizing plate 2 is pasted on the back side of the liquid crystal layer (liquid crystal display element) 3 and the touch panel 4 (previously transparent on the surface).
  • a negative C transparent polyimide substrate on which an electrode is formed is attached.
  • the positive C layer 5 and the front side polarizing plate 6 are disposed on the front side of the touch panel 4.
  • the positive C layer 5 to which the front-side polarizing plate 6 is previously attached may be attached to the front side of the touch panel 4 so that the positive C layer 5 and the touch panel 4 are positioned next to each other.
  • the front side polarizing plate 6 may be attached to the front surface side of the positive C layer 5.
  • a cover glass 7 is pasted on the front side of the front side polarizing plate 6, and the backlight 1 is mounted on the back side of the back side polarizing plate 2.
  • the back side polarizing plate 2 is attached to the back side of the liquid crystal layer (liquid crystal display element) 3 and the positive C layer 5 is provided to the front side.
  • the touch panel 4 negative C-type transparent polyimide substrate having a transparent electrode formed on the surface in advance
  • the front side polarizing plate 6 is pasted on the front side of the touch panel 4.
  • a cover glass 7 is pasted on the front side of the front side polarizing plate 6, and the backlight 1 is mounted on the back side of the back side polarizing plate 2.
  • an inner cell type liquid crystal display device with a touch panel that includes a touch panel having a transparent electrode with excellent conductivity.
  • the liquid crystal display device with a touch panel of the present invention is excellent in the conductivity of the transparent electrode constituting the touch panel, it can be applied to a liquid crystal display device with a large screen touch panel.
  • Backlight 2 Back side polarizing plate 3: Liquid crystal layer (liquid crystal display element) 4: Touch panel having a negative C-type transparent polyimide substrate 5: Positive C layer 6: Front side polarizing plate 7: Cover glass

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

A liquid crystal display device with a touch panel, which is provided with: a back surface-side polarizing plate; a front surface-side polarizing plate that is arranged on the opposite side of the back surface-side polarizing plate; a liquid crystal layer that is arranged between the front surface-side polarizing plate and the back surface-side polarizing plate; a touch panel that is arranged between the liquid crystal layer and the front surface-side polarizing plate, and comprises a negative C transparent polyimide substrate; and a positive C layer that is arranged adjacent to the touch panel.

Description

タッチパネル付き液晶表示装置LCD with touch panel
　本発明は、タッチパネルを備える液晶表示装置に関する。 The present invention relates to a liquid crystal display device including a touch panel.
　従来のタッチパネル付き液晶表示装置としては、液晶表示装置の上にタッチパネルが配置されているアウトセルタイプのものが広く用いられている（例えば、特開２０１２－２３０４９１号公報（特許文献１））。このアウトセルタイプのタッチパネル付き液晶表示装置は、液晶表示装置の上にタッチパネルが重ねられているため、厚みがあるだけでなく、タッチパネルのセンサーパターンが見えるという、いわゆる、骨見えの問題があった。 As a conventional liquid crystal display device with a touch panel, an out-cell type in which a touch panel is disposed on the liquid crystal display device is widely used (for example, Japanese Patent Application Laid-Open No. 2012-230491 (Patent Document 1)). The out-cell type liquid crystal display device with a touch panel has a so-called bone appearance problem that the touch panel sensor pattern is visible as well as the thickness because the touch panel is stacked on the liquid crystal display device. .
　そこで、このような骨見えを防止するために、液晶表示装置の前面側偏光板と液晶層との間にタッチパネルが配置されている、インナーセルタイプのタッチパネル付き液晶表示装置が提案されている（例えば、特開平８－１６１１１６号公報（特許文献２））。このようなインナーセルタイプのタッチパネル付き液晶表示装置においては、前面側偏光板よりも内側（液晶層側）にタッチパネルが配置されているため、タッチパネル用基板には光等方性が要求される。したがって、アウトセルタイプのタッチパネル付き液晶表示装置に用いられているポリエチレンテレフタレート基板は、複屈折が大きい（光等方性が低い）ため、インナーセルタイプのタッチパネル付き液晶表示装置に用いることはできなかった。このため、インナーセルタイプのタッチパネル付き液晶表示装置においては、タッチパネル用基板として、シクロオレフィン系ポリマー基板等の複屈折が小さい（光等方性を有する）樹脂からなる基板を用いる必要があった。 Therefore, in order to prevent such a bone appearance, an inner cell type liquid crystal display device with a touch panel in which a touch panel is arranged between the front polarizing plate and the liquid crystal layer of the liquid crystal display device has been proposed ( For example, JP-A-8-161116 (Patent Document 2)). In such an inner cell type liquid crystal display device with a touch panel, the touch panel is required to have optical isotropy because the touch panel is disposed on the inner side (liquid crystal layer side) than the front side polarizing plate. Therefore, the polyethylene terephthalate substrate used in the out-cell type liquid crystal display device with a touch panel cannot be used for the inner cell type liquid crystal display device with a touch panel because of its large birefringence (low optical isotropy). It was. For this reason, in the inner cell type liquid crystal display device with a touch panel, it is necessary to use a substrate made of a resin having low birefringence (having optical isotropy) such as a cycloolefin polymer substrate as a touch panel substrate.
　しかしながら、シクロオレフィン系ポリマーは耐熱性が低いため、シクロオレフィン系ポリマー基板の表面に透明電極を形成する際に、高温で加熱処理を行うことができず、透明電極の導電性が低くなるという問題があった。このため、シクロオレフィン系ポリマー基板は、大画面のインナーセルタイプのタッチパネル付き液晶表示装置におけるタッチパネル用基板としては不向きであった。 However, since the cycloolefin polymer has low heat resistance, when the transparent electrode is formed on the surface of the cycloolefin polymer substrate, the heat treatment cannot be performed at a high temperature, and the conductivity of the transparent electrode is lowered. was there. For this reason, the cycloolefin polymer substrate is unsuitable as a substrate for a touch panel in a liquid crystal display device with a large-screen inner cell type touch panel.
特開２０１２－２３０４９１号公報JP 2012-230491 A 特開平８－１６１１１６号公報JP-A-8-161116
　本発明は、上記従来技術の有する課題に鑑みてなされたものであり、導電性に優れた透明電極を有するタッチパネルを備えている、インナーセルタイプのタッチパネル付き液晶表示装置を提供することを目的とする。 The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an inner cell type liquid crystal display device with a touch panel, which includes a touch panel having a transparent electrode with excellent conductivity. To do.
　本発明者らは、上記目的を達成すべく鋭意研究を重ねた結果、ポリイミドの優れた耐熱性に着目し、タッチパネル用基板として透明ポリイミド基板を用いることによって、透明電極を形成する際に高温での加熱処理が可能となり、導電性に優れた透明電極を備えているタッチパネルが得られることを見出した。 As a result of intensive studies to achieve the above object, the present inventors have paid attention to the excellent heat resistance of polyimide, and by using a transparent polyimide substrate as a substrate for touch panel, at a high temperature when forming a transparent electrode. It was found that a touch panel provided with a transparent electrode having excellent conductivity can be obtained.
　しかしながら、透明ポリイミド基板は、ネガティブＣ性の複屈折を有するものであるため、インナーセルタイプのタッチパネル付き液晶表示装置のタッチパネル用基板としてそのまま使用すると、表示が乱れるという問題があった。 However, since the transparent polyimide substrate has negative C birefringence, there is a problem that display is disturbed if it is used as it is as a substrate for a touch panel of an inner cell type liquid crystal display device with a touch panel.
　そこで、本発明者らは、このようなネガティブＣ性の透明ポリイミド基板とホメオトロピック配向性を有する層（ポジティブＣ層）とを組み合わせることによって、前記透明ポリイミド基板のネガティブＣ性が前記ポジティブＣ層により光学補償され、表示の乱れが改善されることを見出し、本発明を完成するに至った。 Therefore, the present inventors combine such a negative C transparent polyimide substrate with a layer having a homeotropic orientation (positive C layer), whereby the negative C property of the transparent polyimide substrate becomes the positive C layer. As a result, the present invention has been completed.
　すなわち、本発明のタッチパネル付き液晶表示装置は、
背面側偏光板と、
該背面側偏光板に対向するように配置されている前面側偏光板と、
該前面側偏光板と前記背面側偏光板との間に配置されている液晶層と、
該液晶層と前記前面側偏光板との間に配置されている、ネガティブＣ性の透明ポリイミド基板を有するタッチパネルと、
該タッチパネルの隣に配置されているポジティブＣ層と、
を備えるものである。 That is, the liquid crystal display device with a touch panel of the present invention is
A back side polarizing plate;
A front-side polarizing plate arranged to face the back-side polarizing plate;
A liquid crystal layer disposed between the front polarizing plate and the rear polarizing plate;
A touch panel having a negative C transparent polyimide substrate, disposed between the liquid crystal layer and the front-side polarizing plate;
A positive C layer arranged next to the touch panel;
Is provided.
　このような本発明のタッチパネル付き液晶表示装置において、前記ポジティブＣ層は、前記前面側偏光板と前記タッチパネルとの間、或いは、前記液晶層と前記タッチパネルとの間のいずれに配置されていてもよい。また、前記タッチパネルは、前記ネガティブＣ性の透明ポリイミド基板上にＩＴＯ透明電極を備えるものであることが好ましい。 In such a liquid crystal display device with a touch panel according to the present invention, the positive C layer may be disposed between the front-side polarizing plate and the touch panel, or between the liquid crystal layer and the touch panel. Good. The touch panel preferably includes an ITO transparent electrode on the negative C transparent polyimide substrate.
　本発明によれば、導電性に優れた透明電極を有するタッチパネルを備えている、インナーセルタイプのタッチパネル付き液晶表示装置を得ることが可能となる。 According to the present invention, it is possible to obtain an inner cell type liquid crystal display device with a touch panel, which includes a touch panel having a transparent electrode with excellent conductivity.
本発明のタッチパネル付き液晶表示装置の実施形態の一例を示す模式図である。It is a schematic diagram which shows an example of embodiment of the liquid crystal display device with a touchscreen of this invention. 本発明のタッチパネル付き液晶表示装置の他の実施形態の一例を示す模式図である。It is a schematic diagram which shows an example of other embodiment of the liquid crystal display device with a touchscreen of this invention.
　本発明のタッチパネル付き液晶表示装置は、
背面側偏光板と、
該背面側偏光板に対向するように配置されている前面側偏光板と、
該前面側偏光板と前記背面側偏光板との間に配置されている液晶層と、
該液晶層と前記前面側偏光板との間に配置されている、ネガティブＣ性の透明ポリイミド基板を有するタッチパネルと、
該タッチパネルの隣に配置されているポジティブＣ層と、
を備えているインナーセルタイプのタッチパネル付き液晶表示装置である。 The liquid crystal display device with a touch panel of the present invention is
A back side polarizing plate;
A front-side polarizing plate arranged to face the back-side polarizing plate;
A liquid crystal layer disposed between the front polarizing plate and the rear polarizing plate;
A touch panel having a negative C transparent polyimide substrate, disposed between the liquid crystal layer and the front-side polarizing plate;
A positive C layer arranged next to the touch panel;
An inner cell type liquid crystal display device with a touch panel.
　以下、図面を参照しながら本発明の好適な実施形態について詳細に説明するが、本発明は前記図面に限定されるものではない。なお、以下の説明及び図面中、同一又は相当する要素には同一の符号を付し、重複する説明は省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the drawings. In the following description and drawings, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.
　図１及び図２に示すように、本発明のタッチパネル付き液晶表示装置は、バックライト１、背面側偏光板２、液晶層（液晶表示素子）３、ネガティブＣ性の透明ポリイミド基板を有するタッチパネル４、ポジティブＣ層５、前面側偏光板６、及びカバーガラス７を備えるものである。 As shown in FIGS. 1 and 2, the liquid crystal display device with a touch panel of the present invention includes a backlight 1, a back side polarizing plate 2, a liquid crystal layer (liquid crystal display element) 3, and a touch panel 4 having a negative C transparent polyimide substrate. , Positive C layer 5, front side polarizing plate 6, and cover glass 7.
　本発明のタッチパネル付き液晶表示装置において、バックライト１とカバーガラス７とは、互いに対向するように配置されており、これらの間に、背面側偏光板２と前面側偏光板６とが互いに対向するように配置されている。液晶層３は、背面側偏光板２と前面側偏光板６との間に配置されており、タッチパネル４及びポジティブＣ層５は、互いに隣に位置した状態で、液晶層３と前面側偏光板６との間に配置されている。このように、本発明のタッチパネル付き液晶表示装置においては、タッチパネル４とポジティブＣ層５とが互いに隣に位置した状態で配置されているため、タッチパネル４を構成する透明ポリイミド基板のネガティブＣ性がポジティブＣ層５によって光学補償され、表示の乱れが改善される。 In the liquid crystal display device with a touch panel of the present invention, the backlight 1 and the cover glass 7 are disposed so as to face each other, and the back side polarizing plate 2 and the front side polarizing plate 6 face each other therebetween. Are arranged to be. The liquid crystal layer 3 is disposed between the back side polarizing plate 2 and the front side polarizing plate 6, and the touch panel 4 and the positive C layer 5 are positioned next to each other, and the liquid crystal layer 3 and the front side polarizing plate are disposed. 6 is arranged. Thus, in the liquid crystal display device with a touch panel of the present invention, since the touch panel 4 and the positive C layer 5 are arranged adjacent to each other, the negative C property of the transparent polyimide substrate constituting the touch panel 4 is low. Optical compensation is performed by the positive C layer 5 and display disturbance is improved.
　また、本発明のタッチパネル付き液晶表示装置において、ポジティブＣ層は、図１に示すように、タッチパネル４と前面側偏光板６との間に、すなわち、タッチパネル４の前面側の隣に配置されていてもよいし、図２に示すように、液晶層３とタッチパネル４との間に、すなわち、タッチパネル４の液晶層側の隣に配置されていてもよい。 Further, in the liquid crystal display device with a touch panel of the present invention, the positive C layer is disposed between the touch panel 4 and the front polarizing plate 6, that is, next to the front side of the touch panel 4 as shown in FIG. 1. Alternatively, as shown in FIG. 2, it may be disposed between the liquid crystal layer 3 and the touch panel 4, that is, adjacent to the liquid crystal layer side of the touch panel 4.
　さらに、本発明のタッチパネル付き液晶表示装置において、タッチパネル４は、透明ポリイミド基板が１層のもの（図１及び図２）であっても、２層のもの（図面なし）であってもよい。透明ポリイミド基板が２層の場合、一方の透明ポリイミド基板が、ポジティブＣ層とともに液晶層３と前面側偏光板６との間に配置されていれば、他方の透明ポリイミド基板は、ポジティブＣ層とともに液晶層３と前面側偏光板６との間に配置されていても、前面側偏光板６とカバーガラス７との間に配置されていてもよい（後者の場合、ポジティブＣ層は任意）。 Furthermore, in the liquid crystal display device with a touch panel of the present invention, the touch panel 4 may be a single layer of transparent polyimide substrate (FIGS. 1 and 2) or a double layer (no drawing). When the transparent polyimide substrate has two layers, if one transparent polyimide substrate is disposed between the liquid crystal layer 3 and the front-side polarizing plate 6 together with the positive C layer, the other transparent polyimide substrate is combined with the positive C layer. Even if it is arrange | positioned between the liquid crystal layer 3 and the front side polarizing plate 6, you may arrange | position between the front side polarizing plate 6 and the cover glass 7 (in the latter case, a positive C layer is arbitrary).
　本発明において、タッチパネル４は、ネガティブＣ性の透明ポリイミド基板を有するものであれば特に制限はないが、通常、透明ポリイミド基板の表面に透明電極が配置されたものである（透明電極は図示せず。）。前記透明電極としては特に制限はないが、タッチパネル用基板としてネガティブＣ性の透明ポリイミド基板を用いる利点を十分に生かすという観点から、ＩＴＯ透明電極が好ましい。上述したように、本発明においては、耐熱性に優れた透明ポリイミド基板をタッチパネル用基板として用いているため、透明ポリイミド基板の表面に透明電極を形成する際に、高温（好ましくは１８０℃以上）での加熱処理が可能となり、導電性に優れた透明電極を形成することが可能となる。なお、前記ネガティブＣ性の透明ポリイミド基板は、下記式：
ｎｚ＜ｎｙ≦ｎｘ
（式中、ｎｘは波長５５０ｎｍの光に対するネガティブＣ性の透明ポリイミド基板の面内の最大主屈折率、ｎｙは波長５５０ｎｍの光に対するネガティブＣ性の透明ポリイミド基板の面内の最大主屈折率を有する方向に直交する方向の主屈折率、ｎｚは波長５５０ｎｍの光に対するネガティブＣ性の透明ポリイミド基板の厚さ方向の主屈折率である。）
で表わされる屈折率特性を満たすものである。 In the present invention, the touch panel 4 is not particularly limited as long as it has a negative C transparent polyimide substrate, but usually a transparent electrode is disposed on the surface of the transparent polyimide substrate (the transparent electrode is not shown). ). The transparent electrode is not particularly limited, but an ITO transparent electrode is preferable from the viewpoint of sufficiently utilizing the advantage of using a negative C transparent polyimide substrate as a touch panel substrate. As described above, in the present invention, since a transparent polyimide substrate having excellent heat resistance is used as a touch panel substrate, when a transparent electrode is formed on the surface of the transparent polyimide substrate, the temperature is high (preferably 180 ° C. or higher). Thus, it becomes possible to form a transparent electrode having excellent conductivity. The negative C transparent polyimide substrate has the following formula:
nz <ny ≦ nx
(Where nx is the maximum main refractive index in the plane of the negative C transparent polyimide substrate for light having a wavelength of 550 nm, and ny is the maximum main refractive index in the plane of the negative C transparent polyimide substrate for light having a wavelength of 550 nm. (The main refractive index in the direction perpendicular to the direction in which it is present, and nz is the main refractive index in the thickness direction of the negative C transparent polyimide substrate for light having a wavelength of 550 nm.
It satisfies the refractive index characteristic represented by
　また、本発明において、波長５５０ｎｍの光に対する、タッチパネル４を構成するネガティブＣ性の透明ポリイミド基板の厚さ方向のリターデーションＲｔｈ（ＰＩ）及びポジティブＣ層５の厚さ方向のレタデーションＲｔｈ（ｐＣ）は、下記式：
－１０ｎｍ＜Ｒｔｈ（ＰＩ）＋Ｒｔｈ（ｐＣ）＜＋１０ｎｍ
で表される条件を満たすことが好ましい。これにより、透明ポリイミド基板のネガティブＣ性がポジティブＣ層５によって十分に光学補償され、表示の乱れがより改善される。 Further, in the present invention, the retardation Rth (PI) in the thickness direction of the negative C transparent polyimide substrate constituting the touch panel 4 and the retardation Rth (pC) in the thickness direction of the positive C layer 5 with respect to light having a wavelength of 550 nm. Is the following formula:
−10 nm <Rth (PI) + Rth (pC) <+ 10 nm
It is preferable that the condition represented by As a result, the negative C property of the transparent polyimide substrate is sufficiently optically compensated by the positive C layer 5, and display disturbance is further improved.
　さらに、本発明において、ポジティブＣ層は、下記式：
ｎｙ≦ｎｘ＜ｎｚ
（式中、ｎｘは波長５５０ｎｍの光に対するポジティブＣ層の面内の最大主屈折率、ｎｙは波長５５０ｎｍの光に対するポジティブＣ層の面内の最大主屈折率を有する方向に直交する方向の主屈折率、ｎｚは波長５５０ｎｍの光に対するポジティブＣ層の厚さ方向の主屈折率である。）
で表わされる屈折率特性を満たすものである。 Furthermore, in the present invention, the positive C layer has the following formula:
ny ≦ nx <nz
(Where nx is the maximum principal refractive index in the plane of the positive C layer for light having a wavelength of 550 nm, and ny is the principal in the direction orthogonal to the direction having the maximum principal refractive index in the plane of the positive C layer for light having a wavelength of 550 nm. (Refractive index, nz is the main refractive index in the thickness direction of the positive C layer for light having a wavelength of 550 nm.)
It satisfies the refractive index characteristic represented by
　また、ポジティブＣ層は、波長５５０ｎｍの光に対する、面内リターデーションＲｅ及び厚さ方向のリターデーションＲｔｈが、下記式：
０ｎｍ≦Ｒｅ≦２０ｎｍ
－５００ｎｍ≦Ｒｔｈ≦－３０ｎｍ
で表される条件を満たすことが好ましい。これにより、透明ポリイミド基板のネガティブＣ性がポジティブＣ層５によって十分に光学補償され、表示の乱れが更に改善される傾向にある。 Further, in the positive C layer, the in-plane retardation Re and the thickness direction retardation Rth with respect to light having a wavelength of 550 nm have the following formula:
0nm ≦ Re ≦ 20nm
−500 nm ≦ Rth ≦ −30 nm
It is preferable that the condition represented by As a result, the negative C property of the transparent polyimide substrate is sufficiently optically compensated by the positive C layer 5 and the display disturbance tends to be further improved.
　本発明に用いられる透明ポリイミド基板としては、ネガティブＣ性を有するものであれば特に制限はないが、例えば、特開２００６－１３７８８１号公報に記載の可溶性ポリイミドからなる基板、特開２０１４－１５６５８４号公報に記載のポリイミドからなる基板、特開２０１４－１７３０７１号公報に記載のポリイミドフィルム等が挙げられる。 The transparent polyimide substrate used in the present invention is not particularly limited as long as it has a negative C property. For example, a substrate made of a soluble polyimide described in JP-A-2006-137881, JP-A-2014-156484 Examples thereof include a substrate made of polyimide described in the publication, a polyimide film described in JP-A-2014-173071, and the like.
　また、本発明に用いられるポジティブＣ層としては、ポジティブＣ性を有する層であれば特に制限はないが、例えば、特開２００６－３３７５７５号公報に記載のホメオトロピック配向液晶フィルム（ポジティブＣ型位相差フィルム）を用いて形成された層等が挙げられる。 Further, the positive C layer used in the present invention is not particularly limited as long as it has a positive C property. For example, a homeotropic alignment liquid crystal film (positive C type position) described in JP-A-2006-337575 is used. And a layer formed using a phase difference film).
　本発明に用いられる、バックライト１、背面側偏光板２、液晶層３、前面側偏光板６、及びカバーガラス７としては、特に制限はなく、公知のインナーセルタイプのタッチパネル付き液晶表示装置に用いられるものを適宜選択して用いることができる。 The backlight 1, the back side polarizing plate 2, the liquid crystal layer 3, the front side polarizing plate 6, and the cover glass 7 used in the present invention are not particularly limited, and may be a known inner cell type liquid crystal display device with a touch panel. What is used can be appropriately selected and used.
　本発明のタッチパネル付き液晶表示装置において、タッチパネル４とポジティブＣ層５は、直接（他の層を介さずに）隣接していることが好ましいが、公知の光等方性を有する層を介して近接していてもよい。 In the liquid crystal display device with a touch panel of the present invention, it is preferable that the touch panel 4 and the positive C layer 5 are directly adjacent to each other (not through other layers), but through a layer having a known optical isotropy. It may be close.
　また、本発明のタッチパネル付き液晶表示装置においては、バックライト１と背面側偏光板２との間、背面側偏光板２と液晶層３との間、液晶層３とタッチパネル４との間、ポジティブＣ層５と前面側偏光板６との間、前面側偏光板６とカバーガラス７との間に他の層が配置されていてもよい。このような他の層としては、公知のインナーセルタイプのタッチパネル付き液晶表示装置に用いられる層であれば特に制限はない。 Moreover, in the liquid crystal display device with a touch panel of this invention, between the backlight 1 and the back side polarizing plate 2, between the back side polarizing plate 2 and the liquid crystal layer 3, and between the liquid crystal layer 3 and the touch panel 4, it is positive. Another layer may be disposed between the C layer 5 and the front side polarizing plate 6 and between the front side polarizing plate 6 and the cover glass 7. The other layer is not particularly limited as long as it is a layer used for a known inner cell type liquid crystal display device with a touch panel.
　このような本発明のタッチパネル付き液晶表示装置は、例えば、以下の方法により製造することができる。図１に示す本発明のタッチパネル付き液晶表示装置の場合には、先ず、液晶層（液晶表示素子）３の背面側に背面側偏光板２を貼り付け、前面側にタッチパネル４（予め表面に透明電極を形成したネガティブＣ性の透明ポリイミド基板）を貼り付ける。次に、タッチパネル４の前面側にポジティブＣ層５及び前面側偏光板６を配置する。このとき、予め前面側偏光板６を貼り付けたポジティブＣ層５をタッチパネル４の前面側に、ポジティブＣ層５とタッチパネル４とが互いに隣に位置するように、貼り付けてもよいし、タッチパネル４の前面側にポジティブＣ層５を形成した後、ポジティブＣ層５の前面側に前面側偏光板６を貼り付けてもよい。その後、前面側偏光板６の前面にカバーガラス７を貼り付け、背面側偏光板２の背面にバックライト１を装着する。 Such a liquid crystal display device with a touch panel according to the present invention can be manufactured, for example, by the following method. In the case of the liquid crystal display device with a touch panel of the present invention shown in FIG. 1, first, the back side polarizing plate 2 is pasted on the back side of the liquid crystal layer (liquid crystal display element) 3 and the touch panel 4 (previously transparent on the surface). A negative C transparent polyimide substrate on which an electrode is formed is attached. Next, the positive C layer 5 and the front side polarizing plate 6 are disposed on the front side of the touch panel 4. At this time, the positive C layer 5 to which the front-side polarizing plate 6 is previously attached may be attached to the front side of the touch panel 4 so that the positive C layer 5 and the touch panel 4 are positioned next to each other. After the positive C layer 5 is formed on the front surface side of 4, the front side polarizing plate 6 may be attached to the front surface side of the positive C layer 5. Thereafter, a cover glass 7 is pasted on the front side of the front side polarizing plate 6, and the backlight 1 is mounted on the back side of the back side polarizing plate 2.
　また、図２に示す本発明のタッチパネル付き液晶表示装置の場合には、先ず、液晶層（液晶表示素子）３の背面側に背面側偏光板２を貼り付け、前面側にポジティブＣ層５を形成する。次に、ポジティブＣ層５の前面側にタッチパネル４（予め表面に透明電極を形成したネガティブＣ性の透明ポリイミド基板）を貼り付けた後、タッチパネル４の前面側に前面側偏光板６を貼り付ける。その後、前面側偏光板６の前面にカバーガラス７を貼り付け、背面側偏光板２の背面にバックライト１を装着する。 In the case of the liquid crystal display device with a touch panel according to the present invention shown in FIG. 2, first, the back side polarizing plate 2 is attached to the back side of the liquid crystal layer (liquid crystal display element) 3 and the positive C layer 5 is provided to the front side. Form. Next, after the touch panel 4 (negative C-type transparent polyimide substrate having a transparent electrode formed on the surface in advance) is pasted on the front side of the positive C layer 5, the front side polarizing plate 6 is pasted on the front side of the touch panel 4. . Thereafter, a cover glass 7 is pasted on the front side of the front side polarizing plate 6, and the backlight 1 is mounted on the back side of the back side polarizing plate 2.
　以上説明したように、本発明によれば、導電性に優れた透明電極を有するタッチパネルを備えている、インナーセルタイプのタッチパネル付き液晶表示装置を得ることが可能となる。 As described above, according to the present invention, it is possible to obtain an inner cell type liquid crystal display device with a touch panel that includes a touch panel having a transparent electrode with excellent conductivity.
　したがって、本発明のタッチパネル付き液晶表示装置は、タッチパネルを構成する透明電極の導電性に優れているため、大画面のタッチパネル付き液晶表示装置等に適用することができる。 Therefore, since the liquid crystal display device with a touch panel of the present invention is excellent in the conductivity of the transparent electrode constituting the touch panel, it can be applied to a liquid crystal display device with a large screen touch panel.
　１：バックライト
　２：背面側偏光板
　３：液晶層（液晶表示素子）
　４：ネガティブＣ性の透明ポリイミド基板を有するタッチパネル
　５：ポジティブＣ層
　６：前面側偏光板
　７：カバーガラス 1: Backlight 2: Back side polarizing plate 3: Liquid crystal layer (liquid crystal display element)
4: Touch panel having a negative C-type transparent polyimide substrate 5: Positive C layer 6: Front side polarizing plate 7: Cover glass

Claims (4)

  1. 　背面側偏光板と、
    　該背面側偏光板に対向するように配置されている前面側偏光板と、
    　該前面側偏光板と前記背面側偏光板との間に配置されている液晶層と、
    　該液晶層と前記前面側偏光板との間に配置されている、ネガティブＣ性の透明ポリイミド基板を有するタッチパネルと、
    　該タッチパネルの隣に配置されているポジティブＣ層と、
    を備えているタッチパネル付き液晶表示装置。     A back side polarizing plate;
    A front-side polarizing plate arranged to face the back-side polarizing plate;
    A liquid crystal layer disposed between the front polarizing plate and the rear polarizing plate;
    A touch panel having a negative C transparent polyimide substrate, disposed between the liquid crystal layer and the front-side polarizing plate;
    A positive C layer arranged next to the touch panel;
    A liquid crystal display device with a touch panel.
  2. 　前記ポジティブＣ層が前記前面側偏光板と前記タッチパネルとの間に配置されている、請求項１に記載のタッチパネル付き液晶表示装置。 The liquid crystal display device with a touch panel according to claim 1, wherein the positive C layer is disposed between the front polarizing plate and the touch panel.
  3. 　前記ポジティブＣ層が前記液晶層と前記タッチパネルとの間に配置されている、請求項１に記載のタッチパネル付き液晶表示装置。 The liquid crystal display device with a touch panel according to claim 1, wherein the positive C layer is disposed between the liquid crystal layer and the touch panel.
  4. 　前記タッチパネルが、前記ネガティブＣ性の透明ポリイミド基板上にＩＴＯ透明電極を備えるものである、請求項１～３のいずれか一項に記載のタッチパネル付き液晶表示装置。 The liquid crystal display device with a touch panel according to any one of claims 1 to 3, wherein the touch panel includes an ITO transparent electrode on the negative C transparent polyimide substrate.
PCT/JP2016/062896 2015-08-25 2016-04-25 Liquid crystal display device with touch panel WO2017033496A1 (en)

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