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

• US 9,229,599 B2
• Filed: 05/28/2015
• Issued: 01/05/2016
• 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): Ghebretinsae, Temesgh
• Assistant Examiner(s): CRAWLEY, KEITH L
• Application Number:
  US14/724,728
• Publication Number:
  US 20150261361A1
• Time in Patent Office: 222 Days
• US Class Current: 1/1
• 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 circuit 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, and a plurality of 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 circuit comprising:

a touch circuit to generate a touch scan signal;

a display driver circuit configured to;

apply a common voltage to the electrodes, in a display driving mode; and

apply the touch scan signal to one or more of the electrodes sequentially such that all of the electrodes of the display panel are driven by the touch scan signal over touch periods and apply a signal having a same phase as the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied such that the signal having the same phase as the touch scan signal is applied to all of the data lines of the display panel over the touch periods, in a touch driving mode,

wherein change in self-capacitance of the one or more of the electrodes to which the touch scan signal is applied is sensed to determine touch.

2. The driver circuit 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 circuit 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 circuit 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 circuit is configured to apply the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied, in the touch driving mode.

5. The driver circuit of claim 1, wherein said one or more of the data lines corresponding to said one or more of the electrodes are disposed under said one or more of the electrodes to which the touch scan signal is applied.

6. The driver circuit of claim 1, wherein the display driver circuit applies the touch scan signal generated by the touch circuit to said one or more of the electrodes.

7. The driver circuit of claim 1, wherein:

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

the display driver circuit is configured to sequentially apply the touch scan signal to each of the block type groups of electrodes and 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 electrodes to which the touch scan signal is applied, in the touch driving mode.

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

9. 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, and a plurality of 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 display driver circuit configured to;

apply a common voltage to the electrodes, in a display driving mode; and

apply a touch scan signal to one or more of the electrodes sequentially such that all of the electrodes of the display panel are driven by the touch scan signal over touch periods and apply a signal having a same phase as the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied such that the signal having the same phase as the touch scan signal is applied to all of the data lines of the display panel over the touch periods, in a touch driving mode,

wherein change in self-capacitance of the one or more of the electrodes to which the touch scan signal is applied is sensed to determine touch.

10. The display device of claim 9, 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.

11. The display device of claim 9, 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.

12. The display device of claim 9, wherein the signal having the same phase as the touch scan signal is the touch scan signal itself and the display driver circuit is configured to apply the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied, in the touch driving mode.

13. The display device of claim 9, wherein said one or more of the data lines corresponding to said one or more of the electrodes are disposed under said one or more of the electrodes to which the touch scan signal is applied.

14. The display device of claim 9, wherein:

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

the display driver circuit is configured to sequentially apply the touch scan signal to each of the block type groups of electrodes and 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 electrodes to which the touch scan signal is applied, in the touch driving mode.

15. The display device of claim 14, wherein said one or more of the data lines corresponding to said each of the block type groups of electrodes are disposed under said each of the block type groups of electrodes to which the touch scan signal is applied.

16. A driver circuit 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, and a plurality of 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 circuit comprising:

a touch circuit to generate a touch scan signal; and

a display driver circuit configured to;

apply a common voltage to the electrodes, in a display driving mode; and

apply the touch scan signal to one or more of the electrodes sequentially such that all of the electrodes of the display panel are driven by the touch scan signal over touch periods, and apply the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied such that the touch scan signal is applied to all of the data lines of the display panel over the touch periods, in a touch driving mode,

wherein change in self-capacitance of the one or more of the electrodes to which the touch scan signal is applied is sensed to determine touch.

17. The driver circuit of claim 16, wherein said one or more of the data lines corresponding to said one or more of the electrodes are disposed under said one or more of the electrodes to which the touch scan signal is applied.

18. The driver circuit of claim 16, wherein the display driver circuit applies the touch scan signal generated by the touch circuit to said one or more of the electrodes.

19. The driver circuit of claim 16, wherein:

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

the display driver circuit is configured to sequentially apply the touch scan signal to each of the block type groups of electrodes and apply the touch scan signal to one or more of the data lines corresponding to said each of the block type groups of electrodes to which the touch scan signal is applied, in the touch driving mode.

20. The driver circuit of claim 19, wherein said one or more of the data lines corresponding to said each of the block type groups of electrodes are disposed under said each of the block type groups of electrodes to which the touch scan signal is applied, in the touch driving mode.

21. 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, and a plurality of 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 display driver circuit configured to;

apply a common voltage to the electrodes, in a display driving mode; and

apply a touch scan signal to one or more of the electrodes sequentially such that all of the electrodes of the display panel are driven by the touch scan signal over touch periods, and apply the touch scan signal to one or more of the data lines corresponding to said one or more of the electrodes to which the touch scan signal is applied such that the touch scan signal is applied to all of the data lines of the display panel over the touch periods, in a touch driving mode,

wherein change in self-capacitance of the one or more of the electrodes to which the touch scan signal is applied is sensed to determine touch.

22. The display device of claim 21, wherein said one or more of the data lines corresponding to said one or more of the electrodes are disposed under said one or more of the electrodes to which the touch scan signal is applied.

23. The display device of claim 21, wherein:

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

the display driver circuit is configured to sequentially apply the touch scan signal to each of the block type groups of electrodes and apply the touch scan signal to one or more of the data lines corresponding to said each of the block type groups of electrodes to which the touch scan signal is applied, in the touch driving mode.

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