In-plane switching mode liquid crystal display device

• US 7,295,275 B2
• Filed: 10/15/2004
• Issued: 11/13/2007
• Est. Priority Date: 12/26/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Ko, Doo Hyun
• Primary Examiner(s): TON, MINH TOAN T
• Application Number:
  US10/964,772
• Publication Number:
  US 20050140899A1
• Time in Patent Office: 1,124 Days
• Field of Search: 349/141, 349/38
• US Class Current: 349/141
• CPC Class Codes: G02F 1/13373 Disclination line; Reverse tilt
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode

Abstract

An IPS mode LCD device includes a gate line on a substrate along one direction; a common electrode having a bent portion; a first disclination prevention pattern portion extended from the bent portion of the common electrode toward one side of the common electrode; a data line substantially perpendicular to the gate line; a thin film transistor at a crossing portion of the gate and data lines; a pixel electrode connected to a drain electrode of the thin film transistor, the pixel electrode having a bent portion and being formed substantially parallel to the common electrode; and a second disclination prevention pattern portion extended from a bent portion of the pixel electrode toward one side of the pixel electrode.

Claims

1. An IPS mode LCD device comprising:

a gate line on a substrate along one direction;

a common electrode having a bent portion;

a first disclination prevention pattern portion extended from the bent portion of the common electrode toward one side of the common electrode;

a data line substantially perpendicular to the gate line;

a thin film transistor at a crossing portion of the gate and data lines;

a pixel electrode connected to a drain electrode of the thin film transistor, the pixel electrode having a bent portion and being formed substantially parallel to the common electrode;

a storage electrode extended from the pixel electrode and overlapping a common line;

a second disclination prevention pattern portion extended from a bent portion of the pixel electrode toward one side of the pixel electrode;

a first supplementary capacitor electrode extended from the bent portion of the common electrode toward the one side of the common electrode,

wherein the first supplementary capacitor electrode is a different size than the first disclination prevention pattern portion.

2. The IPS mode LCD device of claim 1, wherein the second disclination prevention pattern portion overlaps the first supplementary capacitor electrode.

3. The IPS mode LCD device of claim 1, further comprising a second supplementary capacitor electrode extended from the one side of the pixel electrode.

4. The IPS mode LCD device of claim 3, wherein the first disclination prevention pattern portion overlaps the second supplementary capacitor electrode.

5. The IPS mode LCD device of claim 3, wherein a second supplementary capacitor is formed of the second supplementary capacitor electrode, the first disclination prevention pattern portion, and an insulating layer interposed between the second supplementary capacitor electrode and the first disclination prevention pattern portion.

6. The IPS mode LCD device of claim 3, wherein the second supplementary capacitor electrode is smaller than the first disclination prevention pattern portion.

7. The IPS mode LCD device of claim 1, wherein the gate line has a bent portion.

8. The IPS mode LCD device of claim 7, wherein the bent portions of the common electrode and pixel electrode bend towards the data line.

9. The IPS mode LCD device of claim 1, wherein the gate line has a bent portion.

10. The IPS mode LCD device of claim 9, wherein the bent portions of the common electrode and the pixel electrode bend towards the gate line.

11. The IPS mode LCD device of claim 1, wherein the gate line and the data line have bent portions.

12. The IPS mode LCD device of claim 11, wherein the bent portions of the common electrode and pixel electrode bend towards one of the gate line and data line.

13. The IPS mode LCD device of claim 1, wherein a common line and the common electrode are formed on a same layer as the gate line.

14. The IPS mode LCD device of claim 1, wherein the pixel electrode is formed integrally on the common line, to form a storage capacitor.

15. The IPS mode LCD device of claim 1, wherein a first supplementary capacitor is formed of the first supplementary capacitor electrode, the second disclination prevention pattern portion, and an insulating layer interposed between the first supplementary capacitor electrode and the second disclination prevention pattern portion.

16. The IPS mode LCD device of claim 1, wherein the first supplementary capacitor electrode is smaller than the second disclination prevention pattern portion.

17. The IPS mode LCD device of claim 1, further comprising a gate insulating layer on an entire surface of the substrate including the gate line, and a passivation layer on an entire surface of the substrate including the data line.

18. The IPS mode LCD device of claim 1, wherein the first supplementary capacitor electrode is a smaller size than the first disclination prevention pattern portion.