LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC APPARATUS

• US 20140293176A1
• Filed: 03/26/2014
• Published: 10/02/2014
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Tamaki, Masaya, Matsushima, Toshiharu
• Granted Patent: US 9,529,238 B2
• Time in Patent Office: Days
• US Class Current: 349/33
• 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 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133738 for homogeneous alignment
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• 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 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/124 interdigital

Abstract

According to an aspect, a liquid crystal display device includes: a first substrate and a second substrate that face each other; a liquid crystal layer provided between the first substrate and the second substrate; and a first electrode and a second electrode provided between the first substrate and the liquid crystal layer. The first electrode includes: at least an electrode base portion that extends in a first direction; and a plurality of comb-shaped portions that protrude from the electrode base portion at a fixed distance away from each other, and extend in a second direction different from the first direction. Each comb-shaped portion has a coupling portion layered on or under the electrode base portion.

Claims

1. A liquid crystal display device comprising:

a first substrate and a second substrate that face each other;

a liquid crystal layer provided between the first substrate and the second substrate; and

a first electrode and a second electrode provided between the first substrate and the liquid crystal layer, wherein

the first electrode includes;

at least an electrode base portion that extends in a first direction; and

a plurality of comb-shaped portions that protrude from the electrode base portion at a fixed distance away from each other, and extend in a second direction different from the first direction, and

each comb-shaped portion has a coupling portion layered on or under the electrode base portion.

2. The liquid crystal display device according to claim 1, wherein the first electrode and the second electrode are arranged in a position where a horizontal electric field for driving the liquid crystal layer is generated.

3. The liquid crystal display device according to claim 2, wherein the first electrode is layered over the second electrode via an insulating layer.

4. The liquid crystal display device according to claim 1, wherein

when a voltage is applied between the first electrode and the second electrode,

in the liquid crystal layer, liquid crystal molecules in an area near one of long sides of the comb-shaped portions that face each other in a width direction of a slit between adjacent comb-shaped portions and liquid crystal molecules in an area near the other one of the long sides of the comb-shaped portions that face each other rotate in opposite directions to each other.

5. The liquid crystal display device according to claim 1, further comprising:

a first orientation film provided between the first electrode and the liquid crystal layer; and

a second orientation film provided between the second substrate and the liquid crystal layer, wherein

the first orientation film is subjected to an orientation process in a first orientation direction that is a parallel direction to the second direction,

the second orientation film is subjected to an orientation process in a second orientation direction that is antiparallel to the first orientation direction, and

when a voltage is not applied between the first electrode and the second electrode,

long axes of liquid crystal molecules are aligned and oriented in the first orientation direction.

6. The liquid crystal display device according to claim 5, wherein

when a voltage is applied between the first electrode and the second electrode,

long-axis directions of the liquid crystal molecules are oriented so that the liquid crystal molecules rise toward a direction perpendicular to the first substrate while rotating clockwise in an area near one of long sides of the comb-shaped portions that face each other in a width direction of a slit and rotating counterclockwise in an area near the other one in an in-plane direction of the first substrate.

7. The liquid crystal display device according to claim 1, wherein the electrode base portion is formed of a translucent conductive material.

8. The liquid crystal display device according to claim 1, wherein the electrode base portion is formed of a metal material.

11. An electronic apparatus comprising:

a liquid crystal display device according to claim 1; and

a control device that supplies an input signal to the liquid crystal display device.

9. The liquid crystal display device according to claim wherein the comb-shaped portions are formed of a translucent conductive material.

10. The liquid crystal display device according to claim wherein the electrode base portion is provided under the coupling portion.