Liquid crystal display device with touch sensing function and plurality of transparent electrode patterns

Patent metadata

Field	Value
Publication number	US-10055058-B2
Application number	US-201615246948-A
Country	US
Kind code	B2
Filing date	Aug 25, 2016
Priority date	Feb 28, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A liquid crystal display device with a surface of a first transparent substrate, the surface of the substrate facing a liquid crystal layer, a plurality of light absorptive resin layer patterns, a plurality of metal layer patterns, a transparent resin layer, and a plurality of transparent electrode patterns are laminated in this order; the plurality of light absorptive resin layer patterns and the plurality of metal layer patterns have openings formed therein and formed into the same shape when viewed in a laminating direction; the plurality of metal layer patterns are arrayed in a first direction, being insulated from each other; the plurality of transparent electrode patterns are arrayed in a second direction perpendicular to the first direction, being insulated from each other; each metal layer pattern has at least one of an alloy layer mainly containing copper, and a copper layer.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a display unit that has a display substrate, a liquid crystal layer, and an array substrate laminated therein in this order, and performs display in a normally-black mode; and
a control unit that controls the display unit and a touch sensing function, wherein
the display substrate has a first transparent substrate, and has a plurality of laminated light absorptive resin layer patterns having openings formed therein, a plurality of metal layer patterns having openings formed therein, a transparent resin layer, and a plurality of transparent electrode patterns that are electrically isolated, laminated in this order on a surface of the first transparent substrate, the surface of the first transparent substrate facing the liquid crystal layer,
the plurality of light absorptive resin layer patterns and the plurality of metal layer patterns have an equal line width and are formed into the same shape and are in alignment, when viewed in a laminating direction along which the display substrate, the liquid crystal layer, and the array substrate are laminated,
a main light absorbing material contained in the light absorptive resin layer patterns is carbon,
an optical density of the light absorptive resin layer patterns per 1 μm thickness is in a range of 0.4 to 1.8, inclusive,
a thickness of the light absorptive resin layer patterns is in a range of 0.1 μm to 0.8 μm, inclusive,
a reflectance of light reflected from an interface between the first transparent substrate and the plurality of light absorptive resin layer patterns changes from 0.2% to 1.8%, respectively,
the plurality of metal layer patterns are arrayed in a first direction perpendicular to the laminating direction, being insulated from each other,
the plurality of transparent electrode patterns are arrayed in a second direction perpendicular to the laminating direction and the first direction, being insulated from each other,
each metal layer pattern has at least one of an alloy layer mainly containing copper, and a copper layer,
the liquid crystal layer contains liquid crystal molecules exhibiting negative dielectric anisotropy and having vertical alignment as an initial alignment, and the display unit performs display in the normally-black mode,
the array substrate has a second transparent substrate, and has a pixel electrode, a thin film transistor, a metal wiring, and an insulating layer laminated on a surface of the second transparent substrate, the surface of the second transparent substrate facing the liquid crystal layer,
the thin film transistor includes a channel layer that contains two or more metal oxides among gallium, indium, zinc, tin, germanium, and aluminum oxides,
the control unit sets the plurality of transparent electrode patterns to a constant electrical potential, applies a touch driving voltage to the plurality of metal layer patterns, and detects a change in electrostatic capacitance across the metal layer patterns and the transparent electrode patterns,
the control unit sets the plurality of transparent electrode patterns to a constant electrical potential, applies a liquid crystal driving voltage for displaying to the pixel electrode to drive the liquid crystal layer,
a frequency of the touch driving voltage and a frequency of the liquid crystal driving voltage are different from each other, and
the control unit sets the frequency of the touch driving voltage and the frequency of the liquid crystal driving voltage such that the frequency of the touch driving voltage does not interfere with the frequency of the liquid crystal driving voltage, wherein
each metal layer pattern is configured of a plurality of layers, and
among the plurality of layers, the layer nearest to the second transparent substrate is a copper-indium alloy layer.

2. The liquid crystal display device of claim 1 , wherein auxiliary conductors having resistivity smaller than resistivity of the plurality of transparent electrode patterns are provided on the transparent electrode patterns.

3. A liquid crystal display device comprising:
a display unit that has a display substrate, a liquid crystal layer, and an array substrate laminated therein in this order, and performs display in a normally-black mode; and
a control unit that controls the display unit and a touch sensing function, wherein
the display substrate has a first transparent substrate, and has a plurality of light absorptive resin layer patterns having openings formed therein, a plurality of metal layer patterns having openings formed therein, a transparent resin layer, and a plurality of transparent electrode patterns that are electrically isolated, laminated in this order on a surface of the first transparent substrate, the surface of the first transparent substrate facing the liquid crystal layer,
the plurality of light absorptive resin layer patterns and the plurality of metal layer patterns have an equal line width and are formed into the same shape and are in alignment, when viewed in a laminating direction along which the display substrate, the liquid crystal layer, and the array substrate are laminated,
the plurality of metal layer patterns are arrayed in a first direction perpendicular to the laminating direction, being insulated from each other,
the plurality of transparent electrode patterns are arrayed in a second direction perpendicular to the laminating direction and the first direction, being insulated from each other,
each metal layer pattern has at least one of an alloy layer mainly containing copper, and a copper layer,
the liquid crystal layer contains liquid crystal molecules exhibiting negative dielectric anisotropy and having vertical alignment as an initial alignment, and the display unit performs display in the normally-black mode,
the array substrate has a second transparent substrate, and has a pixel electrode, a thin film transistor, a metal wiring, and an insulating layer laminated on a surface of the second transparent substrate, the surface of the second transparent substrate facing the liquid crystal layer,
the control unit sets the plurality of transparent electrode patterns to a constant electrical potential, applies a touch driving voltage to the plurality of metal layer patterns, and detects a change in electrostatic capacitance across the metal layer patterns and the transparent electrode patterns,
the control unit sets the plurality of transparent electrode patterns to a constant electrical potential, applies a liquid crystal driving voltage for displaying to the pixel electrode to drive the liquid crystal layer, and
a frequency of the touch driving voltage and a frequency of the liquid crystal driving voltage are different from each other,
each metal layer pattern is configured of a plurality of layers, and
among the plurality of layers, the layer nearest to the second transparent substrate is a copper-indium alloy layer.

Assignees

• Toppan Printing Co Ltd

Inventors

• Kimura Yukihiro
• Fukuyoshi Kenzo

Classifications

• G02F2001/13712

  Physics · mapped topic

• G02F1/133512 Primary

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/1337

  Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G02F2201/123

  pixel · CPC title