In-cell touch type liquid crystal display device

• US 9,429,785 B2
• Filed: 03/31/2016
• Issued: 08/30/2016
• Est. Priority Date: 08/26/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chae, Ji-Eun, Lee, Tae-Keun
• Primary Examiner(s): RALEIGH, DONALD L
• Application Number:
  US15/088,023
• Publication Number:
  US 20160216544A1
• Time in Patent Office: 152 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

An in-cell touch type liquid crystal display device includes a touch line and a dummy touch line along a direction between neighboring pixel electrodes on a first passivation layer; a second passivation layer on the touch line and the dummy touch line; and common electrodes separated from one another in respective touch blocks, and each including first openings corresponding to each pixel region and a second opening corresponding to the touch line, wherein a connection pattern extending over a gate line from a side of the touch line at an inner region of the touch block is connected to a common electrode through a touch contact hole, and wherein an open portion is between the touch line and the dummy touch line.

Claims

1. A display device, comprising:

a plurality of common electrodes that include a first common electrode corresponding to a first touch block and a second common electrode corresponding to a second touch block;

a touch line oriented in a first direction and connected to the first common electrode, the touch line not overlapping with the second common electrode; and

a dummy touch line overlapping with the second common electrode and oriented in the first direction, the dummy touch line aligned with the touch line in the first direction but being disconnected from the touch line.

2. The display device of claim 1, wherein the first common electrode corresponds to a first plurality of pixel regions and the second common electrode correspond to a second plurality of pixel regions.

3. The display device of claim 1, wherein the dummy touch line and the touch line are disconnected in a region between the first common electrode and the second common electrode.

4. The display device of claim 1, wherein the dummy touch line and the touch line are disconnected in a region that corresponds to the first common electrode.

5. The display device of claim 1, wherein the dummy touch line and the touch line are in a same layer.

6. The display device of claim 5, wherein the dummy touch line and the touch line are both in the same layer and on a passivation layer.

7. The display device of claim 5, wherein the dummy touch line and the touch line are in a different layer than the plurality of common electrodes.

8. The display device of claim 1, wherein the dummy touch line and the touch line are both comprised of a same metal material.

9. The display device of claim 1, wherein the touch line overlaps with a first opening in the first common electrode, and the dummy touch line overlaps with a second opening in the second common electrode.

10. The display device of claim 1, wherein the dummy touch line has a dummy compensation pattern extending from a side of the dummy touch line, the dummy compensation pattern extending over a gate line.

11. The display device of claim 10, wherein the dummy compensation pattern extends over the gate line in a region between the first common electrode and the second common electrode.

12. The display device of claim 10, wherein the touch line has a connection pattern extending from a side of the touch line over another gate line, the connection pattern connected to the first common electrode through a contact hole, and the compensation pattern has a substantially same shape as the connection pattern.

13. The display device of claim 1, wherein the common electrodes are supplied with a common voltage during a display period for image display, and the common electrodes function as touch electrodes during a non-display period.