Liquid crystal display device for preventing light leakage and method of fabricating the same

• US 20050007534A1
• Filed: 06/17/2004
• Published: 01/13/2005
• Est. Priority Date: 06/20/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Kim, Kwang Min
• Granted Patent: US 7,038,753 B2
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio

Abstract

An LCD device and a method of fabricating the same are to prevent a light leakage phenomenon of the edge of a pixel and thereby to improve a picture quality. The liquid crystal display device includes a plurality of gate lines and data lines defining a plurality of pixel regions, a switching device formed at a crossing region between each gate line and data line, a pixel electrode formed in the pixel region, a gate dummy line at one side of the pixel electrode along the data line and partially overlapping the pixel electrode, and a data dummy line at one side of the pixel electrode above the gate dummy line and partially overlapping with the pixel electrode.

Claims

1. A liquid crystal display (LCD) device comprising:

a plurality of gate lines and data lines defining a plurality of pixel regions;

a switching device formed at a crossing region between each gate line and data line;

a pixel electrode formed in the pixel region;

a gate dummy line at one side of the pixel electrode along the data line and partially overlapping the pixel electrode; and

a data dummy line at one side of the pixel electrode above the gate dummy line and partially overlapping with the pixel electrode.

2. The LCD device of claim 1, wherein the switching device is a thin film transistor.

3. The LCD device of claim 2, wherein the thin film transistor includes:

a gate electrode formed on a substrate and connected to a gate line;

a first insulating layer formed on the entire substrate where the gate electrode is formed;

a semiconductor layer formed on the first insulating layer;

a source and drain electrode formed on the semiconductor layer and respectively connected to a data line and a pixel electrode; and

a second insulating layer formed on the entire substrate where the source and drain electrode are formed.

4. The LCD device of claim 3, wherein the data dummy line is electrically connected to the pixel electrode through a first contact hole in the second insulating layer.

5. The LCD device of claim 1, wherein the gate dummy line is formed of the same material as the gate line.

6. The LCD device of claim 1, wherein the data dummy line is formed of the same material as the data line.

7. The LCD device of claim 1 further comprising a storage electrode arranged along an adjacent gate line of an adjacent pixel thus forming a storage capacitor with the gate line.

8. The LCD device of claim 7, wherein the data dummy line is connected to the storage electrode.

9. The LCD device of claim 1 further comprising a pair of electrodes arranged in the pixel region and forming a storage capacitor.

10. A liquid crystal display (LCD) device comprising:

a plurality of gate lines and data lines defining a plurality of pixel regions;

a switching device formed at a crossing region between each gate line and data line;

a pixel electrode formed in the pixel region;

a gate dummy line along the data line forming a storage capacitor with the pixel electrode; and

a data dummy line excluding a horizontal electric field formed between the gate dummy line and the pixel electrode.

11. The LCD device of claim 10, wherein the data dummy line is above the gate dummy line and partially overlaps the pixel electrode.

12. A method of fabricating an LCD device, comprising:

preparing a substrate;

forming a gate line and a gate dummy line on the substrate;

forming a first insulating layer on the substrate;

forming a data line, a data dummy line, and a storage electrode on the first insulating layer;

forming a second insulating layer on the substrate, the second insulating layer having a first contact hole that partially exposes the data dummy line and a second contact hole that partially exposes the storage electrode; and

forming a pixel electrode connected to the data dummy line through the first contact hole and connected to the storage electrode through the second contact hole.

13. The method of claim 12, wherein the gate dummy line partially overlaps the edge of the pixel electrode.

14. The method of claim 12, wherein the data dummy line is formed above the gate dummy line to partially overlap the gate dummy line.