Liquid crystal display and fabricating method thereof

• US 20050140892A1
• Filed: 12/23/2004
• Published: 06/30/2005
• Est. Priority Date: 12/30/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Kim, Woong-Kwon, Park, Seung-Ryul
• Granted Patent: US 7,633,595 B2
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• 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 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence

Abstract

A liquid crystal display includes a gate line disposed on a substrate; a data line disposed on the substrate, a pixel area being defined by an intersection of the gate line and the data line; a thin film transistor locating at the intersection of the gate line and the data line; a color filter disposed at each pixel area on the substrate; a spacer formed on a first base surface of the thin film transistor area; a rib formed on a second base surface of the pixel area; and a dummy pattern disposed at the thin film transistor area to form a stepped difference of the first base surface and the second base surface.

Claims

1. A liquid crystal display, comprising:

a gate line disposed on a substrate;

a data line disposed on the substrate, a pixel area being defined by an intersection of the gate line and the data line;

a thin film transistor located at the intersection of the gate line and the data line;

a color filter disposed at each pixel area on the substrate;

a spacer formed on a first base surface of the thin film transistor area;

a rib formed on a second base surface of the pixel area; and

a dummy pattern disposed at the thin film transistor area to form a stepped difference of the first base surface and the second base surface.

2. The liquid crystal display according to claim 1, further comprising a light shielding layer disposed on the thin film transistor separating a color filter from an adjacent pixel area.

3. The liquid crystal display according to claim 2, wherein the dummy pattern is disposed to overlap the light shielding layer, and the dummy pattern is formed of a material identical to that of the color filter of the adjacent pixel area.

4. The liquid crystal display according to claim 1, wherein the dummy pattern is formed of a material identical to that of the color filter of the pixel area having the instant thin film transistor.

5. The liquid crystal display according to claim 1, wherein the dummy pattern includes the color filter material having a color different from a material of the color filter of the adjacent pixel area.

6. The liquid crystal display according to claim 4, wherein the spacer is formed on the dummy pattern, and the rib is formed on the color filter.

7. The liquid crystal display according to claim 1, further comprising an organic protective film disposed underneath the spacer and the rib defines the first and second base surfaces.

8. The liquid crystal display according to claim 1, wherein a first stepped difference of the second base surface and the first base surface is higher than or equal to a second stepped difference of an upper surface of the rib and an upper surface of the spacer.

9. The liquid crystal display according to claim 8, wherein the first stepped difference and the second stepped difference includes a size proportional to each other.

10. A fabricating method of a liquid crystal display, comprising the steps of:

forming a thin film transistor on a substrate;

disposing a first protective film to protect the thin film transistor;

forming a light shielding layer on the first protective film, wherein the light shielding layer overlaps the thin film transistor;

forming a color filter on the first protective film where the light shielding layer is formed, and forming a dummy pattern on the light shielding layer;

forming a pixel electrode connected to the thin film transistor; and

forming a spacer on the dummy pattern and a rib on the color filter simultaneously, wherein the rib controls the arrangement direction of a liquid crystal material.

11. The fabricating method according to claim 10, further comprising the step of disposing a second protective film to cover the dummy pattern and the color filter.

12. The fabricating method according to claim 10, wherein the dummy pattern includes a color filter material of any one of red, green and blue color.

13. The fabricating method according to claim 10, wherein the dummy pattern includes the color filter material having a color different from a material of the color filter of the adjacent pixel area.

14. A fabricating method of a liquid crystal display, comprising the steps of:

forming a thin film transistor on a substrate;

disposing a first protective film to protect the thin film transistor;

forming a color filter on the first protective film;

forming a dummy pattern to overlap the thin film transistor on the color filter;

forming a pixel electrode connected to the thin film transistor; and

forming a spacer on the dummy pattern and a rib on the color filter simultaneously, wherein the rib controls the arrangement direction of a liquid crystal material.

15. The fabricating method according to claim 14, wherein the dummy pattern includes a color filter material of any one of red, green and blue color.

16. The fabricating method according to claim 14, wherein the dummy pattern includes the color filter material having a color different from a material of the color filter of the adjacent pixel area.