Touch sensor integrated display device

• US 10,180,750 B2
• Filed: 05/17/2016
• Issued: 01/15/2019
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Cheolse, Lee, Buyeol, Lee, Sunjung, Hwang, Sangsoo, Woo, Yoonhwan, Han, Manhyeop
• Primary Examiner(s): Mummalaneni, Nalini
• Application Number:
  US15/157,305
• Publication Number:
  US 20160283032A1
• Time in Patent Office: 973 Days
• 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 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A touch sensor integrated display device is provided comprising gate lines and data lines formed on a substrate to be intersected with each other, a plurality of pixel electrodes formed at intersections between the gate lines and the data lines, and a common electrode formed to overlap the plurality of pixel electrodes through an insulating film disposed between the common electrode and the plurality of pixel electrodes, wherein the common electrode includes at least two touch electrodes, each of which is connected to at least one of signal lines arranged in one of a first direction and a second direction crossing the first direction.

Claims

1. A touch sensitive display device, comprising:

a gate line;

a data line;

a plurality of touch electrodes including a touch electrode; and

a signal line electrically connected to the touch electrode,

wherein, during a touch driving mode, a touch drive signal is applied to the touch electrode through the signal line and a touch spot of the touch electrode is measured through the signal line,

wherein, during a display driving mode, a display drive signal is applied to the touch electrode through the signal line,

wherein the signal line overlaps with one corresponding row or column of touch electrodes, the corresponding row or column including the touch electrode, and

wherein the signal line is electrically connected to the touch electrode without being connected to any of the other touch electrodes in the one corresponding row or column of touch electrodes.

2. The touch sensitive display device of claim 1, further comprising a pixel area at a crossing of the gate line and the data line.

3. The touch sensitive display device of claim 1, further comprising:

a first substrate;

a second substrate;

a liquid crystal layer between the first substrate and the second substrate; and

a thin film transistor on the first substrate.

4. The touch sensitive display device of claim 3, further comprising a color filter on the second substrate.

5. The touch sensitive display device of claim 3, wherein the touch electrode is on the first substrate.

6. The touch sensitive display device of claim 3, further comprising a pixel electrode, both the touch electrode and the pixel electrode on the first substrate.

7. The touch sensitive display device of claim 6, wherein the touch sensitive display device operates in an in-plane switching (IPS) mode or a fringe-field switching (FFS) mode.

8. The touch sensitive display device of claim 1, wherein the display drive signal is a common voltage.

9. The touch sensitive display device of claim 1, wherein display signals are applied to the gate line and the data line.

10. The touch sensitive display device of claim 1, further comprising a common electrode, the common electrode including the touch electrode and at least another of the touch electrodes.

11. The touch sensitive display device of claim 1, wherein the signal line is electrically insulated from the other touch electrodes.

12. The touch sensitive display device of claim 1, wherein the touch electrode overlaps with a part of the signal line.

13. The touch sensitive display device of claim 1,

wherein the signal line extends along the corresponding row or column including the touch electrode.

14. The touch sensitive display device of claim 1, further comprising other signal lines, wherein the signal line and the other signal lines extend in a same direction.

15. The touch sensitive display device of claim 1, further comprising other gate lines and other data lines, and pixel electrodes at crossings of the gate line and the other gate lines with the data line and the other data lines, the touch electrode having a size corresponding to two or more of the pixel electrodes.

16. The touch sensitive display device of claim 1, further comprising an insulating layer between the touch electrode and the signal line.

17. The touch sensitive display device of claim 1, further comprising a touch recognition processor, wherein the signal line is further electrically connected to the touch recognition processor.

18. The touch sensitive display device of claim 1, further comprising a touch recognition processor determining the touch spot of the touch electrode.

19. The touch sensitive display device of claim 1, wherein the touch spot of the touch electrode is determined based on an initial capacitance of the touch electrode and a measured capacitance of the touch electrode.

20. The touch sensitive display device of claim 1, wherein the touch spot of the touch electrode is determined based on a difference between a first capacitance of the touch electrode and a second capacitance of the touch electrode.

21. The touch sensitive display device of claim 1, wherein a touch sense signal is received from the touch electrode through the signal line.

22. The touch sensitive display device of claim 1, further comprising other signal lines, wherein the touch drive signal is applied to all of the touch electrodes through the signal line and the other signal lines during one or more touch driving modes.

23. The touch sensitive display device of claim 1, further comprising other signal lines, wherein the display drive signal is applied to all of the touch electrodes through the signal line and the other signal lines during one or more display driving modes, and wherein the display drive signal is a common voltage.

24. A touch sensitive display device, comprising:

a plurality of gate lines;

a plurality of data lines;

a plurality of touch electrodes including at least a first touch electrode and a second touch electrode; and

a plurality of signal lines including at least a first signal line and a second signal line,

wherein the first signal line is electrically connected to the first touch electrode, and the second signal line is electrically connected to the second touch electrode,

wherein the first signal line overlaps with the first touch electrode and the second touch electrode without overlapping with the second signal line,

wherein the second signal line overlaps with the second touch electrode without overlapping with the first signal line.

25. The touch sensitive display device of claim 24, wherein the first touch electrode and the second touch electrode are configured to receive a touch drive signal respectively through the first signal line and the second signal line, and to provide a touch sense signal respectively through the first signal line and the second signal line during a touch driving mode for sensing a touch spot.

26. The touch sensitive display device of claim 25, wherein the first touch electrode and the second touch electrode are configured to receive a display drive signal respectively through the first signal line and the second signal line during a display driving mode for displaying an image on the touch sensitive display device.

27. The touch sensitive display device of claim 24,

wherein the first signal line and the second signal line overlap with one corresponding row or column of touch electrodes among the touch electrodes, the corresponding row or column including the first touch electrode and the second touch electrode, and

wherein the first signal line overlaps with the second touch electrode without being connected to the second touch electrode.

28. The touch sensitive display device of claim 27, wherein the second signal line overlaps with the first touch electrode without being connected to the first touch electrode.