Touch sensible display device, and driving apparatus and method thereof

• US 20060201931A1
• Filed: 04/12/2006
• Published: 09/14/2006
• Est. Priority Date: 04/13/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Joo-Hyung, Uh, Kee-Han, Choi, Young-Jun
• Application Number:
  US11/404,254
• Publication Number:
  US 20060201931A1
• Time in Patent Office: Days
• US Class Current: 219/497
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

A display device according to an embodiment of the present invention includes: a display panel including a plurality of image scanning lines and a plurality of sensor scanning lines; a plurality of display circuits connected to the image scanning lines; a plurality of sensing circuits connected to the sensor scanning lines and outputting sensor output signals according to an external touch; an image scanning driver applying image scanning signals to the image scanning lines; a sensor scanning driver applying sensor scanning signals to the sensor scanning lines; and a signal controller controlling the image scanning driver and the sensor scanning driver to operate at different time periods.

Claims

1. A display device comprising:

a display panel including a plurality of image scanning lines and a plurality of sensor scanning lines;

a plurality of display circuits connected to the image scanning lines;

a plurality of sensing circuits connected to the sensor scanning lines and outputting sensor output signals according to an external touch;

an image scanning driver applying image scanning signals to the image scanning lines;

a sensor scanning driver applying sensor scanning signals to the sensor scanning lines; and

a signal controller controlling the image scanning driver and the sensor scanning driver to operate at different time periods.

2. The display device of claim 1, wherein the image scanning driver applies the image scanning signals in a display time period, and the sensor scanning driver applies the sensor scanning signals in a sensing time period.

3. The display device of claim 2, wherein the display circuits are supplied with a common voltage swinging between a high level and a low level.

4. The display device of claim 3, wherein the common voltage has a first period in the display time period and a second period in the sensing time period.

5. The display device of claim 4, wherein the first period and the second period of the common voltage are different from each other.

6. The display device of claim 4, wherein the first period of the common voltage is shorter than the second period of the common voltage.

7. The display device of claim 4, wherein the common voltage has a first duty ratio in the display time period and a second duty ratio different from the first duty ratio in the sensing period.

8. The display device of claim 7, wherein the first duty ratio of the common voltage is substantially equal to 50%.

9. The display device of claim 3, wherein the sensor scanning signals are supplied when the common voltage is kept constant.

10. The display device of claim 3, further comprising a sensing signal processor reading the sensor output signals when the common voltage is kept constant.

11. The display device of claim 3, further comprising a sensing signal processor reading the sensor output signals when the common voltage is in the longer one of the high level and the low level.

12. The display device of claim 2, wherein the display circuits are supplied with a common voltage, and the common voltage swings between a high level and a low level in the display time period and is kept constant in the sensing time period.

13. A display device comprising:

a display panel including a plurality of image scanning lines and a plurality of sensor scanning lines;

a plurality of display circuits connected to the image scanning lines;

a plurality of sensing circuits connected to the sensor scanning lines and outputting sensor output signals according to an external touch;

an image scanning driver applying image scanning signals to the image scanning lines;

a sensor scanning driver applying sensor scanning signals to the sensor scanning lines;

a common voltage generator generating a common voltage and applying the common voltage to the display panel, the common voltage having a first period and a second period different from the first period within a frame time; and

a signal controller controlling the image scanning driver, the sensor scanning driver, and the common voltage generator.

14. The display device of claim 13, wherein the image scanning driver applies the image scanning signals when the common voltage has the first period, and the sensor scanning driver applies the sensor scanning signals when the common voltage has the second period.

15. The display device of claim 14, wherein the first period of the common voltage is shorter than the second period of the common voltage.

16. The display device of claim 14, wherein the common voltage in the second period has a high level and a low level and durations of the high level and the low level are different from each other.

17. The display device of claim 16, wherein the sensor output signals are read during the duration of the longer one of the high level and the low level of the common voltage.

18. A method of driving a display device including image scanning lines, sensor scanning lines, display circuits coupled to the image scanning lines, and sensing circuits coupled to the sensor scanning lines and outputting sensor output signals according to an external touch, the method comprising:

dividing a frame into a display time period and a sensing time period;

applying image scanning signals in the display time period; and

applying sensor scanning signals in the sensing time period.

19. The method of claim 18, further comprising:

applying a common voltage having a first period in the display time period and a second period in the sensing time period, the second period being different from the first period.

20. The method of claim 19, wherein the common voltage in the second period has a high level and a low level having a different duration from the high level.

21. The method of claim 20, further comprising:

reading the sensor output signals when the common voltage has the longer one of the high level and the low level.