Display device having multi-touch recognizing function and driving method thereof

• US 20080143682A1
• Filed: 05/10/2007
• Published: 06/19/2008
• Est. Priority Date: 12/13/2006
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Shim, Yeon Shim, Bae, Sang Hyuck, Jang, Hyung Uk
• Granted Patent: US 9,552,105 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0428 by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual sensing beam interruptions in a planar beam grid of an optical touch-screen G06F3/0421

Abstract

A display device having a multi-touch recognition function includes an integration module having a plurality of cameras integrated at an edge of a display panel; and a processor that detects a touch area using at least first and second images captured by the plurality of cameras, respectively.

Claims

1. A display device having a multi-touch recognition function, comprising:

an integration module having a plurality of cameras integrated at an edge of a display panel; and

a processor that detects a touch area using at least first and second images captured by the plurality of cameras, respectively.

2. The display device of claim 1, further comprising a controller synchronized with the processor to control the displaying of a background image on the display panel and the capture of the first and second images by the processor.

3. The display device of claim 1, wherein a viewing angle of each of the first and second cameras is in a range of about 80 to about 90 degrees.

4. The display device of claim 1, further comprising at least one non-reflective member in such a spatial relationship with a corresponding one of the first and second cameras as to prevent an optical interference from an incident light.

5. The display device of claim 4, wherein the at least one non-reflective device is substantially in front of the corresponding one of the first and second cameras at a height above the surface of the display panel inversely proportional to a size of the display panel.

6. The display device of claim 4, wherein the height of the at least one non-reflective device above the surface of the display panel is proportional to a distance between the surface of the display panel and the corresponding one of the cameras.

7. The display device according to claim 4, wherein the at least one non-reflective member includes first and second polarizing filters, the optical absorption axes of which cross each other.

8. The display device according to claim 4, wherein the at least one non-reflective member includes one of a black layer and a anti-reflector.

9. The display device of claim 1, wherein the plurality of cameras include first and second cameras capturing the first and second images of the display panel, respectively, and the processor comparing each of the first and second captured images with a displayed image to detect the touch area.

10. The display device of claim 9, wherein controller synchronized the first and second cameras to capture the first and second images substantially simultaneously.

11. The display device of claim 9, wherein the plurality of cameras further includes third and fourth cameras capturing third and fourth images of the display panel, respectively, and the processor verifies the touch area detected by the first and second cameras with the touch area detected by the third and fourth cameras.

18. The display device of claim 7, further comprising third and fourth capture devices assembled with the display panel, each of the third and fourth capture devices capturing third and fourth captured images of the display panel.

19. The display device of claim 18, wherein the processor compares the display data with each of the third and fourth captured images to detect the touch area on the display panel.

20. The display device of claim 19, wherein the processor verifies the touch area detected by the first and second capture devices with the touch area detected by the third and fourth capture devices.

12. A display device, comprising:

a display panel for displaying display data representative of a display image;

first and second capture devices assembled with the display panel, each of the first and second capture devices capturing first and second captured images of the display panel; and

a processor that compares the display data with each of the first and second captured images to detect a touch area on the display panel.

13. The display device of claim 12, further comprising a least one non-reflective member in such a spatial relationship with a corresponding one of the first and second capture devices as to prevent an optical interference from an incident light.

14. The display device of claim 13, wherein the at least one non-reflective device is substantially in front of the corresponding one of the first and second capture devices at a height above the surface of the display panel inversely proportional to a size of the display panel.

15. The display device of claim 14, wherein the height of the at least one non-reflective device above the surface of the display panel is proportional to a distance between the surface of the display panel and the corresponding one of the capture devices.

16. The display device of claim 12, wherein a viewing angle of each of the first and second capture devices is small enough to prevent a capture of an unwanted portion of the display panel but large enough to reduce a shade area excluded from the first captured image.

17. The display device of claim 16, wherein the viewing angle of each of the first and second capture devices is in a range of about 80 to about 90 degrees.

21. A method of detecting a touch area on a display device including a display panel for displaying display data representative of a display image and a plurality of synchronized capture devices assembled with the display panel, the method comprising:

substantially simultaneously capturing first, second, third and fourth captured images of the touched display panel using corresponding ones of the synchronized captured devices; and

comparing the display data with each of the first and second captured images to detect a touch area on the display panel.