IN-CELL TOUCH TYPE DISPLAY DEVICE

• US 20170090635A1
• Filed: 09/28/2016
• Published: 03/30/2017
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: KIM, Kyoung-Wook, SHIN, Ki-Taeg, LIM, Dong-Geun, KANG, Ji-Won
• Granted Patent: US 10,852,865 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An in-cell touch type display device includes a touch electrode that is in a display panel and arranged at each touch block, a sensing line that is connected to the touch electrode, and transfers a common voltage during a display period, and at least one dummy line that is connected to the touch electrode, and has a resistance less than that of the touch electrode.

Claims

1. An in-cell touch type display device having a display panel, comprising:

a touch electrode arranged at each touch block of the display panel;

a sensing line connected to the touch electrode, and transferring a common voltage during a display period; and

at least one dummy line connected to the touch electrode, and having a resistance less than that of the touch electrode.

2. The device of claim 1, wherein the at least one dummy line includes a plurality of dummy lines that are arranged at both sides of the sensing line.

3. The device of claim 1, further comprising an insulating layer having a first contact hole to connect the sensing line and the touch electrode, and a second contact hole to connect the at least one dummy line and the touch electrode, wherein the number of the second contact hole is greater than that of the first contact hole.

4. The device of claim 1, further comprising an insulating layer having a first contact hole to connect the sensing line and the touch electrode, and a second contact hole to connect the at least one dummy line and the touch electrode, wherein the second contact hole has an area greater than that of the first contact hole.

5. The device of claim 1, wherein the display panel includes an array substrate having the touch electrode, wherein the at least one dummy line and the sensing line are located at the same layer and made of the same material.

6. The device of claim 5, wherein the array substrate includes a pixel electrode at a pixel region of the array substrate and corresponding to the touch electrode.

7. The device of claim 1, wherein the at least one dummy line and the touch electrode are electrically in a parallel connection.

8. The device of claim 1, wherein the touch electrode functions as a common electrode.

9. The device of claim 7, wherein a combined resistance between the touch electrode and the at least on dummy line is lower than a resistance of the touch electrode alone.

10. The device of claim 9, wherein a voltage drop is reduced from a connection portion with the sensing line to an edge portion of the touch electrode.

11. The device of claim 2, wherein the number of the dummy lines on the both sides of the sensing line is the same.

12. The device of claim 2, wherein the dummy lines are symmetrically disposed on both side of the sensing line.

13. An in-cell touch type display device having a display panel, comprising:

a touch electrode arranged at each touch block in the display panel;

a sensing line connected to the touch electrode, and transferring a common voltage during a display period; and

at least one dummy line that is connected to the touch electrode, and having a resistance less than that of the touch electrode, wherein the at least one dummy line and the touch electrode are electrically in a parallel connection, so that a combined resistance between the touch electrode and the at least on dummy line is lower than a resistance of the touch electrode alone.

14. The device of claim 13, wherein the number of the dummy lines on both sides of the sensing line is the same.

15. The device of claim 13, wherein the dummy lines are symmetrically disposed on both side of the sensing line.