LIQUID CRYSTAL DISPLAY DEVICE

• US 20100134710A1
• Filed: 11/30/2009
• Published: 06/03/2010
• Est. Priority Date: 12/03/2008
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: ISHITANI, Tetsuji, KUBOTA, Daisuke
• Granted Patent: US 8,395,716 B2
• Time in Patent Office: Days
• US Class Current: 349/46
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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 1/1345 Conductors connecting electrodes to cell terminals
• 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 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

A liquid crystal display device is provided, which includes a thin film transistor including an oxide semiconductor layer, a first electrode layer, a second electrode layer having an opening, a light-transmitting chromatic-color resin layer between the thin film transistor and the second electrode layer, and a liquid crystal layer. One of the first electrode layer and the second electrode layer is a pixel electrode layer which is electrically connected to the thin film transistor, and the other of the first electrode layer and the second electrode layer is a common electrode layer. The light-transmitting chromatic-color resin layer is overlapped with the pixel electrode layer and the oxide semiconductor layer of the thin film transistor.

Claims

1. A liquid crystal display device comprising:

a thin film transistor including an oxide semiconductor layer;

a first electrode layer;

a second electrode layer having an opening;

a light-transmitting chromatic-color resin layer between the thin film transistor and the second electrode layer; and

a liquid crystal layer;

wherein one of the first electrode layer and the second electrode layer is a pixel electrode layer which is electrically connected to the thin film transistor, and the other of the first electrode layer and the second electrode layer is a common electrode layer, and

wherein the light-transmitting chromatic-color resin layer is overlapped with the pixel electrode layer and the oxide semiconductor layer of the thin film transistor.

2. The liquid crystal display device according to claim 1, wherein the oxide semiconductor layer is a channel formation region of the thin film transistor and is overlapped with a gate electrode layer of the thin film transistor.

3. The liquid crystal display device according to claim 1, wherein the oxide semiconductor layer contains at least one selected from the group consisting of indium, gallium, and zinc.

4. The liquid crystal display device according to claim 1, wherein the first electrode layer and the second electrode layer are stacked with the light-transmitting chromatic-color resin layer interposed between the first electrode layer and the second electrode layer.

5. The liquid crystal display device according to claim 1, wherein the first electrode layer is in a flat-plate shape.

6. The liquid crystal display device according to claim 1, wherein the second electrode layer has a comb-like shape.

7. The liquid crystal display device according to claim 1, wherein the light-transmitting chromatic-color resin layer has light transmittance lower than the oxide semiconductor layer.

8. The liquid crystal display device according to claim 1, wherein the light-transmitting chromatic-color resin layer is one of a coloring layer of red, a coloring layer of green, and a coloring layer of blue.

9. The liquid crystal display device according to claim 1, wherein the liquid crystal layer includes a liquid crystal material exhibiting a blue phase.

10. The liquid crystal display device according to claim 1, wherein the liquid crystal layer includes a chiral agent.

11. The liquid crystal display device according to claim 1, wherein the liquid crystal layer includes a photocurable resin and a photopolymerization initiator.

12. A liquid crystal display device comprising:

a thin film transistor including an oxide semiconductor layer;

a first electrode layer;

a second electrode layer having an opening;

a light-transmitting chromatic-color resin layer between the thin film transistor and the second electrode layer;

a liquid crystal layer; and

a light-blocking layer;

wherein one of the first electrode layer and the second electrode layer is a pixel electrode layer which is electrically connected to the thin film transistor, and the other of the first electrode layer and the second electrode layer is a common electrode layer,

wherein the light-transmitting chromatic-color resin layer is overlapped with the pixel electrode layer, and

wherein the light-blocking layer is overlapped with the oxide semiconductor layer of the thin film transistor.

13. The liquid crystal display device according to claim 12, wherein the oxide semiconductor layer is a channel formation region of the thin film transistor and is overlapped with a gate electrode layer of the thin film transistor.

14. The liquid crystal display device according to claim 12, wherein the oxide semiconductor layer contains at least one selected from the group consisting of indium, gallium, and zinc.

15. The liquid crystal display device according to claim 12, wherein the first electrode layer and the second electrode layer are stacked with the light-transmitting chromatic-color resin layer interposed between the first electrode layer and the second electrode layer.

16. The liquid crystal display device according to claim 12, wherein the first electrode layer is in a flat-plate shape.

17. The liquid crystal display device according to claim 12, wherein the second electrode layer has a comb-like shape.

18. The liquid crystal display device according to claim 12, wherein the light-transmitting chromatic-color resin layer has light transmittance lower than the oxide semiconductor layer.

19. The liquid crystal display device according to claim 12, wherein the light-transmitting chromatic-color resin layer is one of a coloring layer of red, a coloring layer of green, and a coloring layer of blue.

20. The liquid crystal display device according to claim 12, wherein the liquid crystal layer includes a liquid crystal material exhibiting a blue phase.

21. The liquid crystal display device according to claim 12, wherein the liquid crystal layer includes a chiral agent.

22. The liquid crystal display device according to claim 12, wherein the liquid crystal layer includes a photocurable resin and a photopolymerization initiator.

23. The liquid crystal display device according to claim 12, wherein the light-blocking layer includes a black resin.

24. The liquid crystal display device according to claim 12, wherein the light-blocking layer is provided in an upper portion of the thin film transistor with the liquid crystal layer interposed between the thin film transistor and the light-blocking layer.