Liquid crystal display device

• US 10,126,585 B2
• Filed: 08/26/2016
• Issued: 11/13/2018
• 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): Davison, Angela
• Application Number:
  US15/248,585
• Publication Number:
  US 20160363797A1
• Time in Patent Office: 809 Days
• 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 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

In a liquid crystal display device, a plurality of first light absorptive resin layer patterns, a plurality of metal layer patterns, a plurality of second light absorptive resin layer patterns, a transparent resin layer, and a plurality of transparent electrode patterns are laminated in this order on a surface of a first transparent substrate facing a liquid crystal layer; the plurality of the first light absorptive resin layer patterns, the plurality of the metal layer patterns, and the plurality of the second light absorptive resin layer patterns have openings formed therein, and are formed into the same shape when viewed in a laminating direction; the plurality of the metal layer patterns are arrayed in a first direction, being insulated from each other, the plurality of the transparent electrode patterns are arrayed in a second direction perpendicular to the first direction, being insulated from each other.

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

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 first light absorptive resin layer patterns having openings formed therein, a plurality of metal layer patterns having openings formed therein, a plurality of second light absorptive resin 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 first light absorptive resin layer patterns, the plurality of metal layer patterns, and the plurality of second light absorptive resin layer patterns are formed into the same shape and with the same image line width 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 array substrate has a second transparent substrate, and has a pixel electrode, a thin film transistor, a metal wiring, and a plurality of insulating layers provided on a surface of the second transparent substrate, the surface of the second transparent substrate facing the liquid crystal layer,

the liquid crystal layer is driven by a longitudinal electrical field between a transparent electrode having the transparent electrode patterns and the pixel electrode,

wherein the thin film transistor includes a channel layer that contains two or more metal oxides among gallium, indium, zinc, tin, and germanium,

in the touch sensing function, a transparent electrode is a detection electrode with a constant potential, being grounded through a high resistance, the plurality of metal layer patterns being touch detecting electrodes, wherein a touch driving voltage is applied across the plurality of transparent electrode patterns and the plurality of metal layer patterns, a change in electrostatic capacitance across the metal layer patterns and the transparent electrode patterns being detected, the thin film transistor being configured to hold the touch driving voltage, and

wherein the plurality of metal layer patterns have a terminal part over the display substrate, the second light absorptive resin layer pattern is removed in the terminal part, and a terminal cover made of an electrically conductive film of the transparent electrode pattern is laminated over the metal layer pattern, and wherein a frequency of a liquid crystal driving voltage applied between the transparent electrode at a constant electrical potential and the pixel electrode is different from that of the touch driving voltage.

2. The liquid crystal display device of claim 1,

wherein the array substrate includes the pixel electrode, and an auxiliary capacitance electrode disposed on an opposite side to the liquid crystal layer,

wherein each auxiliary capacitance electrode forms, in plan view, an overlap with the pixel electrode and an extension of the auxiliary capacitance electrode, wherein in plan view, the extension extends past a distal end of the pixel electrode,

wherein the overlaps as well as the extensions are line-symmetrically disposed with respect to a center line dividing the opening of the first light absorptive resin layer patterns, the metal layer patterns and the second light absorptive resin layer patterns into two, and

wherein a voltage different from the liquid crystal driving voltage is applied to each auxiliary capacitance electrode.

3. The liquid crystal display device of claim 1,

wherein each metal layer pattern is configured of a plurality of layers, and

wherein at least one of the plurality of layers is the alloy layer.

4. The liquid crystal display device of claim 1,

wherein each metal layer pattern has the alloy layer, and

wherein an alloy element contained in the alloy layer is one or more elements selected from magnesium, calcium, titanium, molybdenum, indium, tin, zinc, aluminum, beryllium, and nickel.

5. The liquid crystal display device of claim 1,

wherein each metal layer pattern is configured of a plurality of layers, and

wherein among the plurality of layers, the layer nearest to the second transparent substrate is a copper-indium alloy layer.

6. 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.

7. The liquid crystal display device according to claim 1,

wherein the openings of the first light absorptive resin layer patterns, the openings of the metal layer patterns, and the openings of the second light absorptive resin layer patterns are each provided with any of a red pixel formed of a red layer, a green pixel formed of a green layer, and a blue pixel formed of a blue layer, and

wherein the red pixel, the green pixel, and the blue pixel are inserted between the plurality of metal layer patterns and the transparent resin layer in the laminating direction, and are arranged adjacently to each other when viewed in the laminating direction.

8. The liquid crystal display device of claim 1,

wherein liquid crystal molecules contained in the liquid crystal layer exhibit negative dielectric anisotropy and are initially aligned in a vertical direction.

9. 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

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 first light absorptive resin layer patterns having openings formed therein, a plurality of metal layer patterns having openings formed therein, a plurality of second light absorptive resin 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 first light absorptive resin layer patterns, the plurality of metal layer patterns, and the plurality of second light absorptive resin layer patterns 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 array substrate has a second transparent substrate, and has a pixel electrode, a thin film transistor, a metal wiring, and a plurality of insulating layers provided on a surface of the second transparent substrate, the surface of the second transparent substrate facing the liquid crystal layer,

the touch sensing function at least includes setting the plurality of transparent electrode patterns to a constant electrical potential, applying a touch driving voltage across the plurality of transparent electrode patterns and the plurality of metal layer patterns, and detecting a change in electrostatic capacitance across the metal layer patterns and the transparent electrode patterns,

when the liquid crystal layer is driven, the plurality of transparent electrode patterns are set to a constant electrical potential, a liquid crystal driving voltage is applied across the plurality of transparent electrode patterns and the pixel electrode to drive the liquid crystal layer, and a frequency of the touch driving voltage is different from that of the liquid crystal driving voltage, and

wherein each metal layer pattern is configured of a plurality of layers, and wherein among the plurality of layers, the layer nearest to the second transparent substrate is a copper-indium alloy layer.

10. The liquid crystal display device of claim 9,

wherein the thin film transistor includes a channel layer that contains two or more metal oxides among gallium, indium, zinc, tin, and germanium.

11. The liquid crystal display device of claim 9,

wherein auxiliary conductors having resistivity smaller than resistivity of the plurality of transparent electrode patterns are provided on the transparent electrode patterns.

12. The liquid crystal display device according to claim 9,

wherein the openings of the first light absorptive resin layer patterns, the openings of the metal layer patterns, and the openings of the second light absorptive resin layer patterns are each provided with any of a red pixel formed of a red layer, a green pixel formed of a green layer, and a blue pixel formed of a blue layer, and

wherein the red pixel, the green pixel, and the blue pixel are inserted between the plurality of metal layer patterns and the transparent resin layer in the laminating direction, and are arranged adjacently to each other when viewed in the laminating direction.

13. 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

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 first light absorptive resin layer patterns having openings formed therein, a plurality of metal layer patterns having openings formed therein, a plurality of second light absorptive resin 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 first light absorptive resin layer patterns, the plurality of metal layer patterns, and the plurality of second light absorptive resin layer patterns 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 array substrate has a second transparent substrate, and has a pixel electrode, a thin film transistor, a metal wiring, and a plurality of insulating layers provided on a surface of the second transparent substrate, the surface of the second transparent substrate facing the liquid crystal layer,

the touch sensing function at least includes setting the plurality of the transparent electrode patterns to a constant electrical potential, applying a touch driving voltage across the plurality of transparent electrode patterns and the plurality of metal layer patterns, and detecting a change in electrostatic capacitance across the metal layer patterns and the transparent electrode patterns,

when the liquid crystal layer is driven, the plurality of transparent electrode patterns are set to a constant electrical potential, a liquid crystal driving voltage is applied across the plurality of transparent electrode patterns and the pixel electrode to drive the liquid crystal layer, and a frequency of the touch driving voltage is different from that of the liquid crystal driving voltage, and

wherein the openings of the first light absorptive resin layer patterns, the openings of the metal layer patterns, and the openings of the second light absorptive resin layer patterns are each provided with any of a red pixel formed of a red layer, a green pixel formed of a green layer, and a blue pixel formed of a blue layer, and

wherein the red pixel, the green pixel, and the blue pixel are inserted between the plurality of metal layer patterns and the transparent resin layer in the laminating direction, and are arranged adjacently to each other when viewed in the laminating direction.

14. The liquid crystal display device of claim 13,

wherein the thin film transistor includes a channel layer that contains two or more metal oxides among gallium, indium, zinc, tin, and germanium.

15. The liquid crystal display device of claim 13,

wherein each metal layer pattern is configured of a plurality of layers, and

wherein at least one of the plurality of layers is the alloy layer.

16. The liquid crystal display device of claim 13,

wherein each metal layer pattern has the alloy layer, and

wherein an alloy element contained in the alloy layer is one or more elements selected from magnesium, calcium, titanium, molybdenum, indium, tin, zinc, aluminum, beryllium, and nickel.

17. The liquid crystal display device of claim 13,

wherein auxiliary conductors having resistivity smaller than resistivity of the plurality of transparent electrode patterns are provided on the transparent electrode patterns.