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

• US 9,229,589 B2
• Filed: 12/13/2012
• 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): CRAWLEY, KEITH L
• Application Number:
  US13/714,083
• Publication Number:
  US 20130321296A1
• Time in Patent Office: 1,118 Days
• Field of Search: 345103-104, 345173-178, 349/54, 349/143, 349/147, 178 1801- 1803, 178/18.06, 178/20.01, 178/20.04
• 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 display device with an integrated touch screen, comprising:

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 such that all of the block type groups of electrodes of the display panel are driven by the touch scan signal over touch periods, and

apply a data signal to data lines located under a specific block type group when the touch scan signal is applied to the specific block type group such that the data signal is applied to all the data lines of the display panel over the touch periods; and

a touch IC configured to generate the touch scan signal and apply the touch scan signal to the display driver IC, change in self-capacitance of one or more of the electrodes of the specific block type group to which the touch scan signal is applied being sensed to determine touch.

2. The display device of claim 1, wherein the display driver IC comprises:

a touch driver configured to apply the common voltage or the touch scan signal to the block type groups; and

a display driver configured to apply the data signal to the data lines.

3. The display device of claim 1, wherein the data signal is generated in the display driver IC or applied from outside the display driver IC.

4. The display device of claim 1, wherein the data signal applied to the data lines is a DC voltage.

5. The display device of claim 1, wherein the data signal has a same phase as the touch scan signal.

6. The display device of claim 1, wherein an interval between respective block type groups of electrodes is larger than an interval between respective electrodes included in the block type groups of electrodes.

7. The display device of claim 6, wherein a data line is disposed in the interval between respective block type groups.

8. The display device of claim 1, wherein the block type groups include a same number of electrodes in each group.

9. The display device of claim 1, wherein the block type groups include at least two groups of electrodes.

10. A method of controlling a display device with an integrated touch screen, a display panel of the display device including electrodes divided into a plurality of block type groups and a plurality of data lines, the method comprising:

applying, via a display driver IC of the display device, a common voltage to the electrodes when a driving mode of the display panel is a display driving mode;

sequentially applying, via the display driver IC, a touch scan signal to each block type group when the driving mode of the panel is a touch driving mode such that all of the block type groups of electrodes of the display panel are driven by the touch scan signal over touch periods, and applying a data signal to data lines located under a specific block type group when the touch scan signal is applied to the specific block type group such that the data signal is applied to all the data lines of the display panel over the touch periods; and

generating, via a touch IC of the display device, the touch scan signal and apply the touch scan signal to the display driver IC, change in self-capacitance of one or more of the electrodes of the specific block type group to which the touch scan signal is applied being sensed to determine touch.

11. The method of claim 10, wherein the display driver IC comprises:

a touch driver configured to apply the common voltage or the touch scan signal to the block type groups; and

a display driver configured to apply the data signal to the data lines.

12. The method of claim 10, wherein the data signal is generated in the display driver IC or applied from outside the display driver IC.

13. The method of claim 10, wherein the data signal applied to the data lines is a DC voltage.

14. The method of claim 10, wherein the data signal has a same phase as the touch scan signal.

15. The method of claim 10, wherein an interval between respective block type groups of electrodes is larger than an interval between respective electrodes included in the block type groups of electrodes.

16. The method of claim 15, wherein a data line is disposed in the interval between respective block type groups.

17. The method of claim 10, wherein the block type groups include a same number of electrodes in each group.

18. The method of claim 10, wherein the block type groups include at least two groups of electrodes.