Liquid Crystal Display Device

• US 20120086654A1
• Filed: 09/26/2011
• Published: 04/12/2012
• Est. Priority Date: 10/08/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Song, InHyuk
• Granted Patent: US 8,982,064 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A liquid crystal display device is disclosed, which comprises gate and data lines arranged to cross each other on a substrate to define a pixel region; a pixel electrode formed in the pixel region; a common electrode forming an electric field together with the pixel electrode and sensing a touch of a user; and a sensing line electrically connected with the common electrode, wherein the common electrode includes a plurality of first common electrodes for sensing any one of a touch position of X axis and a touch position of Y axis and a plurality of second common electrodes for sensing the other one of the touch positions of X axis and Y axis, and the sensing line is not electrically connected with the plurality of second common electrodes but electrically connected with the plurality of first common electrodes.

Claims

1. A liquid crystal display device comprising:

gate and data lines arranged to cross each other on a substrate to define a pixel region;

a pixel electrode formed in the pixel region;

a common electrode forming an electric field together with the pixel electrode and sensing a touch of a user; and

a sensing line electrically connected with the common electrode,

wherein the common electrode includes a plurality of first common electrodes for sensing any one of a touch position of X axis and a touch position of Y axis and a plurality of second common electrodes for sensing the other one of the touch positions of X axis and Y axis, and the sensing line is not electrically connected with the plurality of second common electrodes but electrically connected with the plurality of first common electrodes.

2. The liquid crystal display device of claim 1, wherein the pixel electrode is formed below a first passivation film, and the common electrode is formed over the first passivation film and includes one or more slits in the pixel region.

3. The liquid crystal display device of claim 1, wherein the sensing line and the common electrode are spaced apart from each other by interposing a second passivation film therebetween, and the sensing line is electrically connected with the first common electrodes through a first contact hole provided in the second passivation film.

4. The liquid crystal display device of claim 1, wherein the sensing line is formed in a region corresponding to the gate line or the data line.

5. The liquid crystal display device of claim 1, wherein each of the second common electrodes is longitudinally extended in X axis direction or Y axis direction, and the respective first common electrodes are spaced apart from each other by interposing the second common electrodes therebetween.

6. The liquid crystal display device of claim 5, wherein the sensing line is extended in a direction crossing the extended direction of the second common electrodes.

7. The liquid crystal display device of claim 1, further comprising a conductive line electrically connected with the second common electrodes to reduce resistance of the second common electrodes.

8. The liquid crystal display device of claim 7, wherein the conductive line is spaced apart from the common electrode by interposing the second passivation film therebetween, and is electrically connected with the second common electrode through a second contact hole provided in the second passivation film.

9. The liquid crystal display device of claim 7, wherein the conductive line is formed in a region corresponding to the gate line or the data line.

10. The liquid crystal display device of claim 7, wherein the conductive line is not electrically connected with the sensing line.