Liquid crystal display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9645451-B2
Application number	US-201414182470-A
Country	US
Kind code	B2
Filing date	Feb 18, 2014
Priority date	May 29, 2009
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A liquid crystal display device using a liquid crystal exhibiting a blue phase and having a novel structure, and a method for manufacturing the liquid crystal display device. A plurality of structure bodies (also referred to as ribs, protrusions, or projecting portions) are formed over the same substrate, and a pixel electrode and an electrode (a common electrode at a fixed potential) corresponding to the pixel electrode are formed thereover. An electric field is applied to the liquid crystal layer exhibiting a blue phase by using the pixel electrode that has an inclination and the electrode corresponding to the pixel electrode, which also has an inclination. A shorter distance between the adjacent structure bodies allows a strong electric field to be applied to the liquid crystal layer, which results in a reduction in power consumption for driving the liquid crystal.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a transistor over the first substrate;
first to third structure bodies arranged in this order over the first substrate, the first to third structure bodies each protruding from the first substrate;
a first electrode layer over and in contact with the first to third structure bodies;
an insulating layer over the first electrode layer, the insulating layer having an uneven surface due to the first to third structure bodies;
a second electrode layer over the insulating layer;
a liquid crystal layer over the second electrode layer; and
a second substrate over the liquid crystal layer,
wherein the first electrode layer is electrically connected to one of source and drain electrodes of the transistor,
wherein the first to third structure bodies do not overlap with the transistor, and
wherein the second electrode layer covers top surfaces and side surfaces of the first and third structure bodies, and does not cover the second structure body.

2. The liquid crystal display device according to claim 1 , wherein the liquid crystal layer is capable of exhibiting a blue phase.

3. The liquid crystal display device according to claim 1 , wherein the first to third structure bodies comprise an organic resin material.

4. The liquid crystal display device according to claim 1 , further comprising a third electrode layer between the liquid crystal layer and the second substrate.

5. The liquid crystal display device according to claim 4 , wherein the third electrode layer does not overlap the second electrode layer.

6. The liquid crystal display device according to claim 1 , wherein the second electrode layer includes an opening which overlaps the second structure body.

7. The liquid crystal display device according to claim 1 , wherein the insulating layer is in direct contact with the first electrode layer and the second electrode layer.

8. A liquid crystal display device comprising:
a first substrate;
a transistor over the first substrate;
first to third structure bodies arranged in this order over the first substrate, the first to third structure bodies each protruding from the first substrate;
a first electrode layer over and in contact with the first to third structure bodies;
an insulating layer over the first electrode layer, the insulating layer having an uneven surface due to the first to third structure bodies;
a second electrode layer over the insulating layer;
a liquid crystal layer over the second electrode layer; and
a second substrate over the liquid crystal layer,
wherein the first electrode layer is electrically connected to one of source and drain electrodes of the transistor,
wherein the first to third structure bodies each protrude within the liquid crystal layer, and
wherein the second electrode layer covers top surfaces and side surfaces of the first and third structure bodies, and does not cover the second structure body.

9. The liquid crystal display device according to claim 8 , wherein the liquid crystal layer is capable of exhibiting a blue phase.

10. The liquid crystal display device according to claim 8 , wherein the first to third structure bodies comprise an organic resin material.

11. The liquid crystal display device according to claim 8 , further comprising a third electrode layer between the liquid crystal layer and the second substrate.

12. The liquid crystal display device according to claim 11 , wherein the third electrode layer does not overlap the second electrode layer.

13. The liquid crystal display device according to claim 8 , wherein the second electrode layer includes an opening which overlaps the second structure body.

14. The liquid crystal display device according to claim 8 , wherein the insulating layer is in direct contact with the first electrode layer and the second electrode layer.

15. A liquid crystal display device comprising:
a first substrate;
a transistor over the first substrate;
first to third structure bodies arranged in this order over the first substrate, the first to third structure bodies each protruding from the first substrate;
a first electrode layer over and in contact with the first to third structure bodies;
an insulating layer over the first electrode layer, the insulating layer having an uneven surface due to the first to third structure bodies;
a second electrode layer over the insulating layer;
a liquid crystal layer over the second electrode layer; and
a second substrate over the liquid crystal layer,
wherein the first electrode layer is electrically connected to one of source and drain electrodes of the transistor,
wherein the first to third structure bodies are in the same plane with the transistor, and
wherein the second electrode layer covers top surfaces and side surfaces of the first and third structure bodies, and does not cover the second structure body.

16. The liquid crystal display device according to claim 15 , wherein the liquid crystal layer is capable of exhibiting a blue phase.

17. The liquid crystal display device according to claim 15 , wherein the first to third structure bodies comprise an organic resin material.

18. The liquid crystal display device according to claim 15 , further comprising a third electrode layer between the liquid crystal layer and the second substrate.

19. The liquid crystal display device according to claim 18 , wherein the third electrode layer does not overlap the second electrode layer.

20. The liquid crystal display device according to claim 15 , wherein the second electrode layer includes an opening which overlaps the second structure body.

21. The liquid crystal display device according to claim 15 , wherein the insulating layer is in direct contact with the first electrode layer and the second electrode layer.

Assignees

• Semiconductor Energy Lab

Inventors

• Kubota Daisuke
• Yamashita Akio
• Ishitani Tetsuji
• Tamura Tomohiro

Classifications

• H10D30/674

  characterised by the active materials · CPC title

• H10D30/6757

  characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile (TFTs having channel structures for preventing kink or snapback effects H10D30/6708; TFTs having lightly-doped source or drain extensions H10D30/6715) · CPC title

• G02F1/1345

  Conductors connecting electrodes to cell terminals · CPC title

• G02F2202/103

  a-Si · CPC title

• G02F1/134363 Primary

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title