Display device with integrated touch screen and method for driving the same

• US 10,416,817 B2
• Filed: 04/07/2016
• Issued: 09/17/2019
• Est. Priority Date: 05/30/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Junghan, Kim, Sungchul
• Primary Examiner(s): Crawley, Keith L
• Application Number:
  US15/093,672
• Publication Number:
  US 20160224186A1
• Time in Patent Office: 1,258 Days
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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: G09G 2310/0272 Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current
• CPC Class Codes: G09G 2310/0278 Details of driving circuits arranged to drive both scan and data electrodes
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device with an integrated touch screen including a display panel including electrodes divided into a plurality of block type groups and a plurality of data lines; a display driver IC configured to apply a common voltage to the electrodes when a driving mode of the panel is a display driving mode, sequentially apply a touch scan signal to each block type group when the driving mode of the panel is a touch driving mode, and apply a data signal to the data lines associated with a corresponding block type group when the touch scan signal is applied to the corresponding block type group; and a touch IC configured to generate the touch scan signal and apply the touch scan signal to the display driver IC.

Claims

1. A driver integrated circuit (IC) for driving a display device integrated with a touch screen, the display device comprising a display panel including a plurality of data lines, a plurality of gate lines, a plurality of connection lines, and a plurality of touch electrodes, a plurality of pixels of the display device defined at intersections of the plurality of the data lines and the plurality of gate lines, the driver IC comprising:

a touch driver configured to;

apply a common voltage to at least one of the touch electrodes via at least one of the connection lines to display an image on the display device during one or more display driving periods; and

apply a touch scan signal to said at least one of the touch electrodes via said at least one of the connection lines during one or more touch periods; and

a display driver different from the touch driver and configured to;

apply voltages to the data lines to drive a logic in the pixels to display the image on the display device during the one or more display driving periods; and

apply a signal having a same phase as the touch scan signal to at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied during the one or more touch periods.

2. The driver IC of claim 1, wherein the signal having the same phase as the touch scan signal is a DC voltage signal having the same phase as the touch scan signal.

3. The driver IC of claim 1, wherein the signal having the same phase as the touch scan signal is a data signal having the same phase as the touch scan signal.

4. The driver IC of claim 1, wherein the signal having the same phase as the touch scan signal is the touch scan signal itself, and the display driver circuitry is configured to apply the touch scan signal to said at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied.

5. The driver IC of claim 1, wherein said at least one of the data lines corresponding to said at least one of the touch electrodes is disposed under and extends in a same direction as said at least one of the touch electrodes to which the touch scan signal is applied.

6. The driver IC of claim 5, wherein the display driver is configured to apply the signal having the same phase as the touch scan signal to only said at least one of the data lines disposed under said at least one of the touch electrodes to which the touch scan signal is applied and not apply the signal having the same phase as the touch scan signal to other ones of the data lines.

7. The driver IC of claim 1, wherein:

the touch electrodes include a plurality of block type groups of touch electrodes;

the touch driver is configured to sequentially apply the touch scan signal to each of the block type groups of touch electrodes; and

the display driver is configured to apply the signal having the same phase as the touch scan signal to one or more of the data lines corresponding to said each of the block type groups of touch electrodes to which the touch scan signal is applied.

8. The driver IC of claim 7, wherein said one or more of the data lines corresponding to said each of the block type groups of touch electrodes are disposed under said each of the block type groups of touch electrodes to which the touch scan signal is applied.

9. The driver IC of claim 8, wherein the display driver is configured to apply the signal having the same phase as the touch scan signal to only said one or more of the data lines disposed under the block type group of touch electrodes to which the touch scan signal is being applied and not apply the signal having the same phase as the touch scan signal to other ones of the data lines.

26. The driver IC of claim 1, wherein the signal having a same phase as the touch scan signal is applied to all of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied.

27. The driver IC of claim 1, wherein the signal having a same phase as the touch scan signal is applied to said at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied and from which a touch sense signal, responsive to the touch scan signal, is received.

28. The driver IC of claim 1, wherein the touch scan signal is applied to each of the touch electrodes and all of the touch electrodes adjacent to said each of the touch electrodes.

29. The driver IC of claim 1, wherein the at least one of the connection lines overlaps the at least one of the data lines between the at least one of the data lines and the at least one of the touch electrodes corresponding to the at least one of the data lines.

10. A display device with an integrated touch screen, the display device comprising:

a display panel including a plurality of data lines, a plurality of gate lines, a plurality of connection lines, and a plurality of touch electrodes, a plurality of pixels of the display device being defined at intersections of the plurality of the data lines and the plurality of gate lines; and

a driver integrated circuit (IC) including a touch driver and a display driver different from the touch driver,

wherein the touch driver is configured to;

apply a common voltage to at least one of the touch electrodes via at least one of the connection lines to display an image on the display device during one or more display driving periods; and

apply a touch scan signal to said at least one of the touch electrodes via said at least one of the connection lines during one or more touch periods; and

wherein the display driver is configured to;

apply voltages to the data lines to drive a logic in the pixels to display the image on the display device during the one or more display driving periods; and

apply a signal having a same phase as the touch scan signal to at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied during the one or more touch periods.

11. The display device of claim 10, wherein the signal having the same phase as the touch scan signal is a DC voltage signal having the same phase as the touch scan signal.

12. The display device of claim 10, wherein the signal having the same phase as the touch scan signal is a data signal having the same phase as the touch scan signal.

13. The display device of claim 10, wherein the signal having the same phase as the touch scan signal is the touch scan signal itself, and the display driver is configured to apply the touch scan signal to said at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied.

14. The display device of claim 10, wherein said at least one of the data lines corresponding to said at least one of the touch electrodes is disposed under and is parallel with said at least one of the touch electrodes to which the touch scan signal is applied.

15. The display device of claim 14, wherein the display driver is configured to apply the signal having the same phase as the touch scan signal to only said at least one of the data lines disposed under said at least one of the touch electrodes to which the touch scan signal is applied and not apply the signal having the same phase as the touch scan signal to other ones of the data lines.

16. The display device of claim 10, wherein:

the touch electrodes include a plurality of block type groups of touch electrodes;

the touch driver is configured to sequentially apply the touch scan signal to each of the block type groups of touch electrodes; and

the display driver is configured to apply the signal having the same phase as the touch scan signal to one or more of the data lines corresponding to said each of the block type groups of touch electrodes to which the touch scan signal is applied.

17. The display device of claim 16, wherein said one or more of the data lines corresponding to said each of the block type groups of touch electrodes are disposed under said each of the block type groups of touch electrodes to which the touch scan signal is applied.

18. The display device of claim 17, wherein the display driver is configured to apply the signal having the same phase as the touch scan signal to only said one or more of the data lines disposed under the block type group of touch electrodes to which the touch scan signal is being applied and not apply the signal having the same phase as the touch scan signal to other ones of the data lines.

30. The display device of claim 10, wherein the at least one of the connection lines overlaps the at least one of the data lines between the at least one of the data lines and the at least one of the touch electrodes corresponding to the at least one of the data lines.

19. A method for driving a display device integrated with a touch screen, the display device comprising a display panel including a plurality of data lines, a plurality of gate lines, a plurality of connection lines, and a plurality of touch electrodes, a plurality of pixels of the display device defined at intersections of the plurality of the data lines and the plurality of gate lines, and a driver integrated circuit (IC) including a touch driver and a display driver different from the touch driver, the method comprising:

applying a common voltage from the touch driver to at least one of the touch electrodes via at least one of the connection lines to display an image on the display device during one or more display driving periods;

applying voltages from the display driver to the data lines to drive a logic in the pixels to display the image on the display device during the one or more display driving periods;

applying a touch scan signal from the touch driver to said at least one of the touch electrodes via said at least one of the connection lines during one or more touch periods; and

applying a signal having a same phase as the touch scan signal from the display driver to at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied during the one or more touch periods.

20. The method of claim 19, wherein the signal having the same phase as the touch scan signal is the touch scan signal itself, and the touch scan signal is applied to said at least one of the data lines corresponding to said at least one of the touch electrodes to which the touch scan signal is applied.

21. The method of claim 19, wherein said at least one of the data lines corresponding to said at least one of the touch electrodes is disposed under and extends in a same direction as said at least one of the touch electrodes to which the touch scan signal is applied.

22. The method of claim 19, wherein the signal having the same phase as the touch scan signal is applied to only said at least one of the data lines disposed under said at least one of the touch electrodes to which the touch scan signal is applied, and the signal having the same phase as the touch scan signal is not applied to other ones of the data lines.

23. The method of claim 19, wherein:

the touch electrodes include a plurality of block type groups of touch electrodes; and

the touch scan signal is sequentially applied to each of the block type groups of touch electrodes and the signal having the same phase as the touch scan signal is applied to one or more of the data lines corresponding to said each of the block type groups of touch electrodes to which the touch scan signal is applied.

24. The method of claim 23, wherein said one or more of the data lines corresponding to said each of the block type groups of touch electrodes are disposed under said each of the block type groups of touch electrodes to which the touch scan signal is applied.

25. The method of claim 24, wherein the signal having the same phase as the touch scan signal is applied to only said one or more of the data lines disposed under the block type group of touch electrodes to which the touch scan signal is being applied and the signal having the same phase as the touch scan signal is not applied to other ones of the data lines.