Liquid crystal display device provided with a sensing electrode for sensing a touch of a user

• US 8,878,814 B2
• Filed: 09/26/2011
• Issued: 11/04/2014
• Est. Priority Date: 10/08/2010
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Song, InHyuk
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): MARTINEZ QUILES, IVELISSE
• Application Number:
  US13/244,988
• Publication Number:
  US 20120086665A1
• Time in Patent Office: 1,135 Days
• Field of Search: 345/174, 345/104
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• 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: 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 first and second substrates; gate and data lines arranged to cross each other on the first 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; a light shielding layer formed on the second substrate to shield light leakage to a region other than the pixel region; column spacers formed on the light shielding layer to maintain a cell gap; and a sensing line formed on the column spacers and electrically connected with the common electrode.

Claims

1. A liquid crystal display device comprising:

first and second substrates;

gate and data lines arranged to cross each other on the first 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;

a light shielding layer formed on the second substrate to shield light leakage to a region other than the pixel region;

column spacers formed on the light shielding layer to maintain a cell gap; and

a sensing line formed on the column spacers and electrically connected with the common electrode,

wherein the common electrode includes a plurality of first common electrodes for sensing only 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,

wherein the plurality of second common electrodes are extended from one end portion of the substrate to the other portion of the substrate continuously,

wherein the common electrode is formed on the first substrate and the sensing line is formed on the second substrate.

2. The liquid crystal display device of claim 1, wherein the pixel electrode is formed below a passivation film, and the common electrode is formed over the 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 is formed in a straight line, and the column spacers are formed in a region corresponding to the first common electrodes on the sensing line but are not formed in a region corresponding to the second common electrodes.

4. The liquid crystal display device of claim 1, wherein the column spacers are arranged in the region corresponding to the first common electrodes and the region corresponding to the second common electrodes, and the sensing line is not formed in a straight line but extended around the column spacers formed in the region corresponding to the second common electrodes.

5. The liquid crystal display device of claim 4, wherein a layer for a cell gap is additionally formed on the column spacers formed in the region corresponding to the second common electrodes.

6. 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, and 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, wherein the sensing line is formed in a region corresponding to the light shielding layer.

8. 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.

9. The liquid crystal display device of claim 8, wherein the conductive line is formed in a region corresponding to the gate line or the data line.