DISPLAY DEVICE WITH AN INTEGRATED TOUCH SCREEN AND METHOD FOR DRIVING THE SAME

• US 20130342479A1
• Filed: 12/13/2012
• Published: 12/26/2013
• Est. Priority Date: 06/20/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: PYO, SeungEun, KIM, HongChul
• Granted Patent: US 9,075,463 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/04166 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 3/04184 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

Abstract

A display device with an integrated touch screen including a panel including electrodes divided into n number of groups, where n is an integer more than or equal to two; a display driver IC configured to apply a common voltage to the n divided groups when a driving mode of the panel is a display driving mode, and to selectively apply a touch scan signal or the common voltage to the n divided groups when the driving mode of the panel is a touch driving mode; and a touch IC configured to generate the touch scan signal to apply the touch scan signal to the display driver IC.

Claims

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

a panel including electrodes divided into n number of groups, where n is an integer more than or equal to two;

a display driver IC configured to apply a common voltage to the n divided groups when a driving mode of the panel is a display driving mode, and to selectively apply a touch scan signal or the common voltage to the n divided groups when the driving mode of the panel is a touch driving mode; and

a touch IC configured to generate the touch scan signal to apply the touch scan signal to the display driver IC.

2. The display device of claim 1, wherein when the driving mode is the touch driving mode, the display driver IC sequentially applies the touch scan signal to the n divided groups, and applies the common voltage to a group to which the touch scan signal is not applied.

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

a common voltage generation unit configured to generate the common voltage;

a switching unit; and

a control unit configured to generate a sync signal that indicates the driving mode of the panel, and a control signal configured to control the switching unit to connect the n groups with the common voltage generation unit or connect the touch IC with one of the n groups, and to connect the common voltage generation unit with other groups of the n groups not connected to the touch IC according to the control signal.

4. The display device of claim 3, wherein the control unit comprises:

a sync controller configured to generate the sync signal; and

a switching controller configured to generate the control signal.

5. The display device of claim 4, wherein the switching controller is configured to generate the control signal according to the sync signal.

6. The display device of claim 1, wherein the common voltage applied during the display driving mode and the touch driving mode is not a ground voltage.

7. The display device of claim 1, wherein the touch scan signal includes a voltage signal.

8. The display device of claim 7, wherein the common voltage is less than the voltage signal.

9. A method of controlling a display device with an integrated touch screen, the method comprising:

dividing a panel of the display device including electrodes into n number of groups, where n is an integer more than or equal to two;

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

selectively applying, via the display driver IC, a touch scan signal or the common voltage to the n divided groups when the driving mode of the panel is a touch driving mode; and

generating, via a touch IC of the display device, the touch scan signal to apply the touch scan signal to the display driver IC.

10. The method of claim 9, wherein when the driving mode is the touch driving mode, the selectively applying step sequentially applies the touch scan signal to the n divided groups, and applies the common voltage to a group to which the touch scan signal is not applied.

11. The method of claim 9, wherein the display driver IC comprises:

a common voltage generation unit configured to generate the common voltage;

a switching unit; and

a control unit configured to generate a sync signal that indicates the driving mode of the panel, and a control signal configured to control the switching unit to connect the n groups with the common voltage generation unit or connect the touch IC with one of the n groups, and to connect the common voltage generation unit with other groups of the n groups not connected to the touch IC according to the control signal.

12. The method of claim 11, wherein the control unit comprises:

a sync controller configured to generate the sync signal; and

a switching controller configured to generate the control signal.

13. The method of claim 12, wherein the switching controller generates the control signal according to the sync signal.

14. The method of claim 9, wherein the common voltage applied during the display driving mode and the touch driving mode is not a ground voltage.

15. The method of claim 9, wherein the touch scan signal includes a voltage signal.

16. The method of claim 15, wherein the common voltage is less than the voltage signal.