PLASMA DISPLAY DEVICE

• US 20100134445A1
• Filed: 11/20/2009
• Published: 06/03/2010
• Est. Priority Date: 12/01/2008
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Choo, Seong-Gi, Cho, Yu-Jeong
• Granted Patent: US 8,558,816 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• 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 plasma display device that enables a reduction of costs in implementing a touch panel function using infrared rays generated when displaying an image, which are emitted in a substantially uniform dispersion from a display area. One embodiment includes a plasma display panel (PDP) for displaying the image and a pair of infrared sensor cameras at two corners of the PDP. The infrared sensor cameras are either on the front or rear side of the PDP, and are utilized to detect changes in the amount of infrared rays emitted from the PDP. A controller determines a position where the amount of infrared rays is changed, which corresponds to a touch position, and transmits a detection signal indicating the location of the change in the amount of infrared rays. The infrared sensor camera has a lens with a view angle in the range of 90° to 180°.

Claims

1. A plasma display device, comprising:

a plasma display panel (PDP) for displaying an image;

an infrared sensor camera on a front side or a rear side of the plasma display device for detecting a change in an amount of infrared rays emitted from the PDP; and

a controller for determining a touch position corresponding to a position of the change in the amount of infrared rays,

wherein the infrared sensor camera comprises a lens having a view angle in a range of about 90°

to 180°

.

2. The plasma display device of claim 1, wherein the view angle of the infrared sensor camera is in a range of about 94°

to 110°

.

3. The plasma display device of claim 2, wherein a focal distance of the infrared sensor camera is in a range of about 16 mm to 20 mm.

4. The plasma display device of claim 1, wherein the infrared sensor camera has a focal distance in a range of about 15 mm to 20 mm.

5. The plasma display device of claim 4, wherein the infrared sensor camera is on the front side of the PDP.

6. The plasma display device of claim 5, wherein the PDP comprises:

a display area where the image is displayed; and

a non-display area where the image is not displayed, the non-display area at a periphery of the display area,

wherein the infrared sensor camera comprises a first front side infrared sensor camera and a second front side infrared sensor camera on the non-display area corresponding to two corners of the display area.

7. The plasma display device of claim 6, wherein the PDP has a rectangular shape having a pair of long sides, opposed to each other, and a pair of short sides, opposed to each other orthogonally to the long sides,

wherein the first front side infrared sensor camera and the second front side infrared sensor camera are at opposing ends of one of the long sides.

8. The plasma display device of claim 7, further comprising a chassis base attached to the rear side of the PDP for supporting the PDP.

9. The plasma display device of claim 4, further comprising a chassis base attached to the rear side of the PDP for supporting the PDP, wherein the infrared sensor is at the rear side of the PDP.

10. The plasma display device of claim 9, wherein the PDP comprises:

a display area for displaying the image; and

a non-display area where the image is not displayed, the non-display area at a periphery of the display area,

wherein the infrared sensor camera comprises a first rear side infrared sensor camera and a second rear side infrared sensor camera on the non-display area corresponding to two corners of the display area.

11. The plasma display device of claim 10, wherein the PDP has a rectangular shape having a pair of long sides, opposed to each other, and a pair of short sides, opposed to each other orthogonally to the long sides,

wherein the first rear side infrared sensor camera and the second rear side infrared sensor camera are at opposing ends of one of the short sides.

12. The plasma display device of claim 11, wherein the chassis base comprises:

a first horizontal member attached to the PDP;

a second horizontal member for attaching an electronic circuit board;

a vertical member between the first horizontal member and a second horizontal member, for providing a space between the first horizontal member and the second horizontal member,

wherein the infrared sensor camera is in the space.

13. The plasma display device of claim 12, wherein the vertical member comprises an air vent hole for venting heat from the space.

14. The plasma display device of claim 4, wherein the PDP comprises:

a display area for displaying the image; and

a non-display area where the image is not displayed, the non-display area at a periphery of the display area,

wherein the infrared sensor camera comprises a third infrared sensor camera and a fourth infrared sensor camera on the non-display area corresponding to diagonally opposed corners of the PDP.

15. A plasma display device comprising:

a plasma display panel (PDP) for displaying an image; and

a pair of infrared sensor cameras at respective corners of the PDP, the infrared sensor cameras having view angles of at least 90′

; and

a controller for determining a touch position where an object touches the PDP,

wherein the touch position corresponds to an intersection of lines representing respective detection directions corresponding to the respective infrared cameras.

16. The plasma display device of claim 15, wherein the controller is configured to compare data from the infrared sensor cameras corresponding to the intersection of the lines to predetermined data to determine the touch position.

17. The plasma display device of claim 15, wherein the pair of infrared sensor cameras are at a front side of the PDP, and are configured to detect a change in an amount of infrared rays at a front surface of the PDP corresponding to the touch position of the object.

18. The plasma display device of claim 15, wherein the pair of infrared sensor cameras are at a rear side of the PDP, and are configured to detect a change in an amount of infrared rays passing from a front surface of the PDP through the PDP and emitted from a rear surface of the PDP, at a location corresponding to the touch position of the object.