Thin film transistor liquid crystal display

• US 9,052,550 B2
• Filed: 11/29/2007
• Issued: 06/09/2015
• Est. Priority Date: 11/29/2006
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Long, Chunping, Cui, Jianing
• Primary Examiner(s): Robinson, Mark
• Assistant Examiner(s): Chiem, Erin
• Application Number:
  US11/947,115
• Publication Number:
  US 20080123007A1
• Time in Patent Office: 2,749 Days
• Field of Search: 349/155
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13392 spacers dispersed on the cell substrate, e.g. spherical particles, microfibres
• 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 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence

Abstract

A thin film transistor liquid crystal display (TFT LCD), including a TFT array substrate, a color filter substrate and a post spacer disposed between the TFT array substrate and the color filter substrate. The TFT array substrate includes a gate line, a data line, and a TFT disposed in a pixel area defined by the gate line and the data line crossing with each other, and the TFT comprises a source/drain electrode. The post spacer is located in a region at least partially surrounded by the source/drain electrode, the data line and the gate line.

Claims

1. A thin film transistor liquid crystal device (TFT LCD), comprising:

a TFT array substrate, comprising

a gate line extending in a first direction,

a data line extending in a second direction perpendicular to the first direction, and

a TFT disposed in a pixel area defined by the gate line and the data line crossing with each other and comprising a source/drain electrode extending in the second direction;

a color filter substrate; and

a post spacer disposed between the TFT substrate and the color filter substrate and located in a region at least partially surrounded by a surrounding region defined by the source/drain electrode, the data line, and the gate line, wherein the region has a step difference down from the surrounding region defined by the source/drain electrode, data line and gate line that limits movement of the post spacer.

2. The TFT LCD according to claim 1, further comprising a light blocking bar in the pixel area,

wherein the light blocking bar comprises a bending end extending towards the source/drain electrode, and the post spacer is located in the region at least partially surrounded by the bending end of the light blocking bar, the source/drain electrode, the data line, and the gate line.

3. The TFT LCD according to claim 2, wherein the bending end of the light blocking bar is about 1-60 μ

m in length and separated from the source/drain electrode.

4. The TFT LCD according to claim 2, wherein a distance between the bending end of the light blocking bar and the gate line is about 1-60 μ

m.

5. The TFT LCD according to claim 2, wherein the longitudinal sectional shape of the post spacers is a trapezoid, while the cross-sectional shape of the post spacer is selected from the group consisting of a circle and a polygon.

6. The TFT LCD according to claim 2, wherein one end of the post spacer on the TFT array substrate has a width of about 1-40 μ

m while another end of the post spacer on the color filter substrate has a width of about 1-80 μ

m.

7. The TFT LCD according to claim 2, wherein an opening is formed in the at least partially surrounded region of the TFT array substrate, and one end of the post spacer is located in the opening.

8. The TFT LCD according to claim 7, wherein the opening exposes an underlying substrate of the TFT array substrate.

9. The TFT LCD according to claim 1, wherein a part of the data line adjacent to the position where the data line and gate line cross with each other and a corresponding active layer under the part of the data line have a bending shape so as to form a closed region with the source/drain electrode and the gate line, and the post spacer is located in the closed region.

10. The TFT LCD according to claim 9, wherein the length of bending portion of the data line is about 1-60 μ

m.

11. The TFT LCD according to claim 9, wherein the shape of the closed region is selected from the group consisting of a circle and a polygon.

12. The TFT LCD according to claim 9, wherein the longitudinal sectional shape of the post spacer is a trapezoid while the cross-sectional shape of the post spacer is selected from the group consisting of a circle and a polygon.

13. The TFT LCD according to claim 9, wherein one end of the post spacer on the TFT array substrate has a width of about 1-40 μ

m while another end of the post spacer on the color filter substrate has a width of about 1-80 μ

m.

14. The TFT LCD according to claim 9, wherein an opening is formed in the closed region of the TFT array substrate, and one end of the post spacer is located in the opening.

15. The TFT LCD according to claim 14, wherein the opening exposes an underlying substrate of the TFT array substrate.

16. The TFT LCD according to claim 9, wherein the bending shape is a V-shape.

17. The TFT LCD according to claim 1, wherein the surrounding region defined by the source/drain electrode, the data line, and the gate line is a raised surrounding region.

18. The TFT LCD according to claim 1, wherein the step difference limits movement of the post spacer laterally.