LIQUID CRYSTAL DISPLAY DEVICE

• US 20160077389A1
• Filed: 08/14/2015
• Published: 03/17/2016
• Est. Priority Date: 09/12/2014
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Morimoto, Hirokazu, Hinata, Shoji, Takeda, Arihiro
• Application Number:
  US14/826,327
• Publication Number:
  US 20160077389A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 1/133334 Electromagnetic shields
• 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 1/136218 Shield electrodes

Abstract

According to one embodiment, a liquid crystal display device includes a first substrate including a first insulative substrate, a gate line, a source line, a switching element, a pixel electrode, and a common electrode a second substrate including a second insulative substrate, a light shield layer disposed on that side of the second insulative substrate, which is opposed to the first substrate, and partitioning the pixels, and a shield electrode stacked on that side of the light shield layer, which is opposed to the first substrate, and formed of a metallic material, and a liquid crystal layer held between the first substrate and the second substrate.

Claims

1. A liquid crystal display device comprising:

a first substrate including a first insulative substrate, a gate line extending in a first direction, a source line extending in a second direction crossing the first direction, a switching element electrically connected to the gate line and the source line, a pixel electrode disposed in each of pixels and electrically connected to the switching element, and a common electrode disposed over a plurality of pixels;

a second substrate including a second insulative substrate, a light shield layer disposed on that side of the second insulative substrate, which is opposed to the first substrate, and partitioning the pixels, and a shield electrode stacked on that side of the light shield layer, which is opposed to the first substrate, and formed of a metallic material; and

a liquid crystal layer held between the first substrate and the second substrate.

2. The liquid crystal display device of claim 1, wherein the first substrate further includes a pad of a ground potential, and an electrically conductive member configured to electrically connect the pad and the shield electrode.

3. The liquid crystal display device of claim 1, wherein the common electrode includes a first common electrode located on the first insulative substrate side of the source line, and a second common electrode including a second main common electrode located on the liquid crystal layer side of the source line and opposed to the source line.

4. The liquid crystal display device of claim 3, wherein the first common electrode is opposed to the source line, extends in the first direction, is opposed to the gate line, and extends in the second direction.

5. The liquid crystal display device of claim 3, wherein the first common electrode is opposed to the pixel electrode.

6. The liquid crystal display device of claim 3, wherein the second common electrode is formed in a grid shape surrounding the pixel electrode.

7. The liquid crystal display device of claim 1, wherein the shield electrode is formed in a grid shape surrounding the pixel electrode, in a plane defined by the first direction and the second direction.

8. The liquid crystal display device of claim 1, wherein the second substrate further includes a third common electrode disposed on that side of the shield electrode, which is opposed to the first substrate.

9. The liquid crystal display device of claim 8, further comprising a signal source configured to apply to the shield electrode a noise cancel signal having a phase opposite to a phase of driving noise.

10. The liquid crystal display device of claim 1, further comprising, on an outer surface side of the second substrate, a detection electrode configured to detect contact or approach of an object.

11. The liquid crystal display device of claim 1, wherein the light shield layer is formed of a resin material which is colored in black.

12. The liquid crystal display device of claim 1, wherein the light shield layer is disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, and

the second substrate further includes a color filter disposed on the inner surface of the second insulative substrate, the color filter including a portion overlapping the shield electrode.

13. The liquid crystal display device of claim 1, wherein the second substrate further includes a color filter disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, and an overcoat layer covering the color filter, and

the light shield layer is disposed on an inner surface of the color filter, which is opposed to the first substrate, and the light shield layer and the shield electrode are covered with the overcoat layer.

14. The liquid crystal display device of claim 1, wherein the second substrate further includes a color filter disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, an overcoat layer covering the color filter, and an alignment film covering the overcoat layer, and

the light shield layer is disposed on an inner surface of the overcoat layer, which is opposed to the first substrate, and the light shield layer and the shield electrode are covered with the alignment film.

15. A liquid crystal display device comprising:

a first substrate including a first insulative substrate, a semiconductor layer, a first insulation film covering the semiconductor layer, a gate line extending in a first direction above the first insulation film, a second insulation film covering the gate line, a first common electrode formed above the second insulation film, a third insulation film covering the first common electrode, a source line extending in a second direction above the third insulation film, a fourth insulation film covering the source line, a pixel electrode including a main pixel electrode extending in the second direction above the fourth insulation film, and a second common electrode extending in the second direction above the fourth insulation film, including a second main common electrode opposed to the source line, and having the same potential as the first common electrode;

a second substrate including a second insulative substrate, a light shield layer disposed on that side of the second insulative substrate, which is opposed to the first substrate, and partitioning the pixels, and a shield electrode stacked on that side of the light shield layer, which is opposed to the first substrate, and formed of a metallic material; and

a liquid crystal layer held between the first substrate and the second substrate.

16. The liquid crystal display device of claim 15, wherein the first to third insulation films are formed of an inorganic material, and the fourth insulation film is formed of an organic material.

17. The liquid crystal display device of claim 15, wherein the first common electrode is opposed to the source line, extends in the first direction, is opposed to the gate line, and extends in the second direction.

18. The liquid crystal display device of claim 15, wherein the first common electrode is opposed to the pixel electrode.

19. The liquid crystal display device of claim 15, wherein the second common electrode is formed in a grid shape surrounding the pixel electrode.

20. The liquid crystal display device of claim 15, wherein the shield electrode is formed in a grid shape surrounding the pixel electrode, in a plane defined by the first direction and the second direction.

21. The liquid crystal display device of claim 15, wherein the light shield layer is disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, and

the second substrate further includes a color filter disposed on the inner surface of the second insulative substrate, the color filter including a portion overlapping the shield electrode.

22. The liquid crystal display device of claim 15, wherein the second substrate further includes a color filter disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, and an overcoat layer covering the color filter, and

the light shield layer is disposed on an inner surface of the color filter, which is opposed to the first substrate, and the light shield layer and the shield electrode are covered with the overcoat layer.

23. The liquid crystal display device of claim 15, wherein the second substrate further includes a color filter disposed on an inner surface of the second insulative substrate, which is opposed to the first substrate, an overcoat layer covering the color filter, and an alignment film covering the overcoat layer, and

the light shield layer is disposed on an inner surface of the overcoat layer, which is opposed to the first substrate, and the light shield layer and the shield electrode are covered with the alignment film.