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

• US 10,055,058 B2
• Filed: 08/25/2016
• Issued: 08/21/2018
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Kimura, Yukihiro, Fukuyoshi, Kenzo
• Primary Examiner(s): Dicke, Chad
• Application Number:
  US15/246,948
• Publication Number:
  US 20160364082A1
• Time in Patent Office: 726 Days
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133742 for homeotropic alignment
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13712 the liquid crystal having negative dielectric anisotropy
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 : Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04182 : Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/0445 : using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

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.

Claims

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 μ

m 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 μ

m to 0.8 μ

m, 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.