Liquid crystal display device and defect repairing method for the same

• US 20020131010A1
• Filed: 09/19/2001
• Published: 09/19/2002
• Est. Priority Date: 03/14/2001
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Fujitsu Limited
• Inventors: Kamada, Tsuyoshi, Tsukao, Kouji, Ozaki, Kiyoshi
• Granted Patent: US 6,940,579 B2
• Time in Patent Office: Days
• US Class Current: 349/192
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/136259 Repairing; Defects
• CPC Class Codes: G02F 1/136263 Line defects

Abstract

The present invention relates to a liquid crystal display device and a defect repairing method for the same, and has an object to provide a liquid crystal display device in which a disconnection defect occurring in a storage capacitor bus line can be repaired without producing a new point defect, and a defect repairing method for the same. In the defect repairing method for the liquid crystal display device in which the disconnection defect of the storage capacitor bus line formed on a substrate is repaired, the method includes a step of forming disconnection repairing contact holes for exposing the storage capacitor bus line at both end portions of a disconnection of the storage capacitor bus line and in regions where a pixel electrode is not formed, and a step of forming a disconnection repairing conductive film for electrically connecting both the end portions of the disconnection through the disconnection repairing contact holes without short-circuiting the pixel electrode, and is constructed such that the disconnection defect is repaired by a disconnection repair path constituted by the disconnection repairing conductive film.

Claims

1. A defect repairing method for repairing a disconnection defect of a storage capacitor bus line formed on a substrate of a liquid crystal display device, the method comprising the steps of:

a first step of forming disconnection repairing contact holes for exposing the storage capacitor bus line at both portions of a disconnection of the storage capacitor bus line and in regions where a pixel electrode is not formed; and

a second step of forming a disconnection repairing conductive film for electrically connecting both the portions of the disconnection through the disconnection repairing contact holes without short-circuiting the pixel electrode.

2. A defect repairing method according to claim 1, wherein the disconnection repairing conductive film is formed to detour around the pixel electrode.

3. A defect repairing method according to claim 1, wherein a part of the pixel electrode is electrically separated to form an isolation region, and the isolation region is used as a part of the disconnection repairing conductive film.

4. A defect repairing method according to claim 1, wherein the disconnection repairing conductive film is formed around the pixel electrode in advance.

5. A defect repairing method according to claim 1, further comprising:

a step of forming a separation region by separating the pixel electrode above a storage capacitor electrode formed to be opposite to the storage capacitor bus line through an insulating film and dividing the pixel electrode in two at both sides of the separation region,

wherein in the second step, the disconnection repairing conductive film is formed on the separation region.

6. A defect repairing method according to claim 5, further comprising:

a step of forming a pixel electrode connection conductive film for electrically connecting the two divided pixel electrodes without short-circuiting the disconnection repairing conductive film.

7. A defect repairing method according to claim 6, wherein the pixel electrode connection conductive film is formed by a laser CVD method.

8. A defect repairing method according to claim 1, further comprising:

a step of forming a disconnection repairing insulating film on the pixel electrode before the second step,

wherein in the second step, the disconnection repairing conductive film is formed on the disconnection repairing insulating film.

9. A defect repairing method according to claim 8, wherein the disconnection repairing insulating film is formed by a laser CVD method.

10. A defect repairing method according to claim 1, wherein the disconnection repairing conductive film is formed by a laser CVD method.

11. A liquid crystal display device comprising:

an insulating substrate;

pixel regions arranged in a matrix form on the substrate;

storage capacitor bus lines formed to cross the pixel regions;

storage capacitor electrodes formed to be opposite to the storage capacitor bus lines through an insulating film; and

two divided pixel electrodes formed in each of the pixel regions above the storage capacitor electrode at both sides of an electrically separated separation region, each of the divided pixel electrodes being electrically connected to the storage capacitor electrode.

12. A liquid crystal display device according to claim 11, wherein the separation region has a sufficient width to form a disconnection repairing conductive film of the storage capacitor bus line.

13. A liquid crystal display device according to claim 11, wherein each of the storage capacitor electrodes includes two protruding regions, and is electrically connected to the two pixel electrodes through contact holes formed in the two protruding regions.

15. A liquid crystal display device according to claim 14, wherein the disconnection repairing conductive film is made of a formation material of the pixel electrode and is formed at the same time as the pixel electrode.

16. A liquid crystal display device according to claim 14, wherein the disconnection repairing conductive film is formed so that both wiring ends are positioned above a storage capacitor bus line.

14. A liquid crystal display device comprising:

an insulating substrate;

a pixel electrode formed in each pixel region on the substrate; and

a disconnection repairing conductive film electrically separated from the pixel electrode and formed around the pixel electrode.