Liquid crystal display device

• US 10,025,146 B2
• Filed: 12/14/2016
• Issued: 07/17/2018
• Est. Priority Date: 12/17/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Akiyoshi, Muneharu
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US15/378,457
• Publication Number:
  US 20170176823A1
• Time in Patent Office: 580 Days
• Field of Search: None
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes 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 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/13685 Top gates
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: G02F 2201/123 pixel

Abstract

According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes an organic insulating film, a first electrode formed on the organic insulating film, an inorganic insulating film formed on the first electrode, a second electrode formed on the inorganic insulating film, and an alignment film. The alignment film is in contact with the organic insulating film and the second electrode.

Claims

1. A liquid crystal display device comprising a first substrate, a second substrate located opposite to the first substrate, and a liquid crystal layer held between the first substrate and the second substrate,

the first substrate including:

an organic insulating film;

a first electrode formed on the organic insulating film;

an inorganic insulating film formed on the first electrode;

a second electrode formed on the inorganic insulating film;

an alignment film formed above the organic insulating film, the first electrode, the inorganic insulating film and the second electrode, the alignment film being in contact with the organic insulating film and the second electrode;

a switching element formed below the organic insulating film;

a conductive layer formed on the organic insulating film and spaced from the first electrode;

a first contact hole formed in the organic insulating film to expose the switching element;

a second contact hole spaced from a region as seen in plan view, the region being located opposite to the first contact hole, the second contact hole being formed in the inorganic insulating layer to expose the conductive layer,

wherein the conductive layer is connected to the switching element through the first contact hole, and the second electrode is connected to the conductive layer through the second contact hole.

2. The liquid crystal display device of claim 1, wherein the organic insulating film is a color filter.

3. The liquid crystal display device of claim 1, wherein the first electrode includes an opening which is located in a region where the alignment film is in contact with the organic insulating film.

4. The liquid crystal display device of claim 1, wherein the first electrode includes a first divided portion and a second divided portion which are located in a region that is located opposite to a region where the alignment film is in contact with the organic insulating film, with a gap interposed between the first and second divided portions.

5. The liquid crystal display device of claim 1, wherein as seen in plan view, the inorganic insulating film has the same area and shape as the second electrode, and the second electrode is completely stacked on the inorganic insulating layer.

6. The liquid crystal display device of claim 1, wherein the first substrate further includes a signal line formed below the organic insulating film, and a region where the alignment film is in contact with the organic insulating film extends along the signal line.

7. A liquid crystal display device comprising a first substrate, a second substrate located opposite to the first substrate, and a liquid crystal layer held between the first substrate and the second substrate,

the first substrate including:

an organic insulating film;

a first electrode formed on the organic insulating film;

an inorganic insulating film formed on the first electrode;

a second electrode formed on the inorganic insulating film; and

an alignment film formed above the organic insulating film, the first electrode, the inorganic insulating film and the second electrode, the alignment film being in contact with the organic insulating film and the second electrode,

wherein the first substrate further includes a conductive layer formed on the organic insulating film and spaced from the first electrode, and

in a cross section of the first substrate, the conductive layer includes a first bent portion, and the second electrode includes a second bent portion spaced from a region located opposite to the first bent portion.