OPTICAL TOUCH DEVICE

• US 20130106784A1
• Filed: 09/05/2012
• Published: 05/02/2013
• Est. Priority Date: 10/28/2011
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Wistron Corporation
• Inventors: Chou, Chia-Te
• Granted Patent: US 8,922,528 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

An optical touch device includes a display panel whereon a coordinate detecting area is formed, at least one optical transceiver disposed on a corner of the display panel for transceiving a plurality of beams travelling along an edge of the coordinate detecting area so as to form an optical virtual frame, at least one image capturing module disposed on a corner of the display panel for capturing surroundings of an object, and a control module coupled to the at least one image capturing module for determining whether to calculate a coordinate value of the object according to whether the object blocks the optical virtual frame by the captured surroundings of the object.

Claims

1. An optical touch device comprising:

a display panel whereon a coordinate detecting area is formed;

at least one optical transceiver disposed on a corner of the display panel for transceiving a plurality of beams travelling along an edge of the coordinate detecting area so as to form an optical virtual frame;

at least one image capturing module disposed on a corner of the display panel for capturing surroundings of an object; and

a control module coupled to the at least one image capturing module for determining whether to calculate a coordinate value of the object according to whether the object blocks the optical virtual frame by the captured surroundings of the object.

2. The optical touch device of claim 1, wherein the at least one optical transceiver is a laser transceiver or an infrared transceiver for transceiving straight light beams.

3. The optical touch device of claim 2, further comprising at least one optical filter unit disposed on a position corresponding to the at least one image capturing module for filtering beams traveling into the at least one image capturing module so that the at least one image capturing module captures the beams with the same wavelength as a wavelength of the beams emitted from the at least one optical transceiver.

4. The optical touch device of claim 3, wherein the control module calculates the coordinate value of the object when the control module determines that the object blocks the optical virtual frame.

5. The optical touch device of claim 3, further comprising at least one reflective optical unit disposed on an optical path of the optical virtual frame for reflecting the beams emitted from the at least one optical transceiver back to the at least one optical transceiver.

6. The optical touch device of claim 5, wherein the optical touch device comprises two optical transceivers disposed on the corner of the display panel for transceiving the plurality of beams travelling in parallel and in opposite directions, and the optical touch device comprises three reflective optical units disposed on the other three corners of the display panel for reflecting the plurality of beams travelling in parallel and in the opposite directions.

7. The optical touch device of claim 3, wherein the optical touch device comprises a plurality of optical transceivers for transceiving the plurality of beams travelling in parallel and in opposite directions.

8. The optical touch device of claim 3, wherein the optical touch device comprises two image capturing modules respectively installed on two corners of the same side of the display panel.

9. The optical touch device of claim. 3, wherein each image capturing module is an image sensor.

10. The optical touch device of claim 1, wherein the control module calculates the coordinate value of the object when the control module determines that the object blocks the optical virtual frame.

11. The optical touch device of claim 1, further comprising at least one reflective optical unit disposed on an optical path of the optical virtual frame for reflecting the beams emitted from the at least one optical transceiver back to the at least one optical transceiver.

12. The optical touch device of claim 11, wherein the optical touch device comprises two optical transceivers disposed on the corner of the display panel for transceiving the plurality of beams travelling in parallel and in opposite directions, and the optical touch device comprises three reflective optical units disposed on the other three corners of the display panel for reflecting the plurality of beams travelling in parallel and in the opposite directions.

13. The optical touch device of claim 1, wherein the optical touch device comprises a plurality of optical transceivers for transceiving the plurality of beams travelling in parallel and in opposite directions.

14. The optical touch device of claim 1, wherein the optical touch device comprises two image capturing modules respectively installed on two corners of the same side of the display panel.

15. The optical touch device of claim 1, wherein each image capturing module is an image sensor.

16. The optical touch device of claim 1, wherein the control module does not calculate the coordinate value of the object when the control module determines that the object does not block the optical virtual frame.

17. The optical touch device of claim. 16, further comprising at least one reflective optical unit disposed on an optical path of the optical virtual frame for reflecting the beams emitted from the at least one optical transceiver back to the at least one optical transceiver.

18. The optical touch device of claim 16, wherein the optical touch device comprises two optical transceivers disposed on the corner of the display panel for transceiving the plurality of beams travelling in parallel and in opposite directions, and the optical touch device comprises three reflective optical units disposed on the other three corners of the display panel for reflecting the plurality of beams travelling in parallel and in the opposite directions.

19. The optical touch device of claim 16, wherein the optical touch device comprises a plurality of optical transceivers for transceiving the plurality of beams travelling in parallel and in opposite directions.

20. The optical touch device of claim 16, wherein the optical touch device comprises two image capturing modules respectively installed on two corners of the same side of the display panel.