Liquid Crystal Display Device

• US 20120133858A1
• Filed: 08/31/2011
• Published: 05/31/2012
• Est. Priority Date: 11/25/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: SHIN, Hee Sun, Oh, Kum Mi, Lee, Han Seok
• Granted Patent: US 8,792,061 B2
• Time in Patent Office: Days
• US Class Current: 349/59
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/13685 Top gates
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• 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
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

A liquid crystal display device includes a substrate; gate and data lines disposed on the substrate crossing each other to define a plurality of pixel regions; a plurality of pixel electrodes disposed in the pixel regions; a common electrode which is patterned to have common electrode pattern portions, each common electrode pattern portion corresponding to a respective pixel region; a plurality of sensing lines disposed on the common electrode and electrically connected with the common electrode; and at least one an electric field shield layer disposed over a region between adjacent common electrode pattern portions.

Claims

1. An LCD device, comprising:

a substrate;

gate and data lines disposed on the substrate crossing each other to define a plurality of pixel regions;

a plurality of pixel electrodes disposed in the pixel regions;

a common electrode which is patterned to have common electrode pattern portions, each common electrode pattern portion corresponding to a respective pixel region;

a plurality of sensing lines disposed on the common electrode and electrically connected with the common electrode; and

at least one an electric field shield layer disposed over a region between adjacent common electrode pattern portions.

2. The LCD device according to claim 1, wherein the electric field shield layer is disposed above the data line over at least a region where the common electrode is absent.

3. The LCD device according to claim 1, wherein the electric field shield layer is disposed on the same layer as the pixel electrode, and is formed of the same material as the pixel electrode.

4. The LCD device according to claim 1, wherein the electric field shield layer is electrically connected with a respective common electrode pattern portion.

5. The LCD device according to claim 4, wherein the electric field shield layer includes a contact portion protruding toward the respective common electrode pattern portion, and wherein the contact portion is connected with the common electrode pattern portion via a contact hole.

6. The LCD device according to claim 5, wherein the contact portion is formed in a non-transmission region to prevent the decrease of aperture ratio.

7. The LCD device according to claim 6, wherein the non-transmission region correspond to a black matrix region or thin film transistor region.

8. The LCD device according to claim 1, wherein the electric field shield layer is overlapped with the gate line.

9. The LCD device according to claim 8, wherein the electric field shield layer is continuous between at least two pixel region.

10. The LCD device according to claim 1, wherein the electric field shield layer includes a contact portion protruding toward a respective sensing line, and the contact portion is connected with the sensing line via a contact hole.

11. The LCD device according to claim 1, wherein the pixel electrode is formed over the common electrode with an insulating interlayer disposed between the pixel electrode and the common electrode.

12. The LCD device of claim 1, wherein the common electrode pattern portions each have a bent shape, and wherein the first sensing line is disposed at the bent portion of the common electrode pattern portions to prevent disclination.

13. The LCD device of claim 1, wherein the common electrode forms an electric filed together with the pixel electrode.

14. The LCD device of claim 1, wherein the sensing lines sense a position of a user'"'"'s touch.