In-plane switching liquid crystal display and driving method thereof

• US 20050264744A1
• Filed: 05/23/2005
• Published: 12/01/2005
• Est. Priority Date: 05/31/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Do Sung, Kang, Byung Koo
• Granted Patent: US 7,502,087 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• 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 1/136286 Wiring, e.g. gate line, drain line

Abstract

An in-plane switching LCD including a plurality of gate and data lines crossing each other to define a plurality of pixel areas; a thin film transistor formed at a crossing of the data and gate lines; a pair of common lines facing each other and substantially parallel to the data lines in the pixel areas; a common electrode integrally formed with the common lines, the common electrode being inclined by a predetermined angle; a pair of pixel electrode lines overlapping the common lines; and a pixel electrode integrally formed with the pixel electrode lines, the pixel electrode being inclined substantially parallel to the common electrode, the pixel electrode being arranged in an alternating pattern with the common electrode, wherein the gate lines are formed substantially parallel to the common electrode and the pixel electrode.

Claims

1. An in-plane switching liquid crystal display comprising:

a plurality of gate lines and a plurality of data lines crossing each other to define a plurality of pixel areas;

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

a pair of common lines facing each other and substantially parallel to the data lines in the pixel areas;

a common electrode integrally formed with the common lines, the common electrode being inclined by a predetermined angle;

a pair of pixel electrode lines overlapping the common lines; and

a pixel electrode integrally formed with the pixel electrode lines, the pixel electrode being inclined substantially parallel to the common electrode, the pixel electrode being arranged in an alternating pattern with the common electrode,

wherein the gate lines are formed substantially parallel to the common electrode and the pixel electrode.

2. The display according to claim 1, wherein the gate lines are inclined substantially parallel to the common electrode and the pixel electrode, wherein an aperture ratio is increased at the crossing of the data and gate lines.

3. The display according to claim 1, wherein the common electrode inclines upward or downward in accordance with a predetermined angle with respect to a horizontal center line of the pixel areas.

4. The display according to claim 1, wherein the pixel electrode inclines upward or downward in accordance with a predetermined angle with respect to a horizontal center line of the pixel areas.

5. The display according to claim 1, wherein a storage capacitance is formed in a region where the common lines and the pixel electrode lines overlap with each other.

6. The display according to claim 1, wherein the gate lines, the common electrode, and the pixel electrode are arranged to incline by a same angle and to be substantially parallel to one another in the pixel areas.

7. The display according to claim 1, wherein the gate lines, the common electrode, and the pixel electrode are arranged to incline by an angle of below about 45°

with respect to a horizontal direction.

8. The display according to claim 1, wherein the common lines are formed to have a width of about 8 μ

m or below.

9. The display according to claim 1, wherein the gate lines and a front gate line are formed to extend from each other so as to widen an opening area of each pixel area.

10. The display according to claim 1, wherein the thin film transistor is disposed at a left or right side of the pixel area according to pixel columns.

11. The display according to claim 1, wherein pixel electrodes are spaced apart from each other by a predetermined interval in the pixel areas.

12. The display according to claim 11, wherein the pixel electrodes are spaced apart from each other by a predetermined interval of about 10 μ

m in the pixel areas.

13. A method for driving an in-plane switching liquid crystal display, comprising:

sequentially applying a data signal to data lines; and

sequentially applying a scan signal to gate lines, wherein voltages of a different polarity are alternately applied to pixel areas of a liquid crystal panel.

14. The method according to claim 13, wherein the data signal is sequentially applied to the data lines using a column inversion method.

15. The method according to claim 13, wherein the voltages of different polarity are alternately applied to the pixel areas using a dot inversion method.

16. The method according to claim 13, wherein the voltages of different polarity are alternately applied to the pixel areas in a vertical direction.

17. The method according to claim 13, wherein the voltages of different polarity are alternately applied to the pixel areas in a horizontal direction.