Optical touch liquid crystal display device

• US 20100214268A1
• Filed: 05/06/2009
• Published: 08/26/2010
• Est. Priority Date: 02/23/2009
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Fu, Mei-Chi, Lee, Chien-Pang, Huang, Ming-Wei, Chiang, Cheng-Sheng
• Application Number:
  US12/436,752
• Publication Number:
  US 20100214268A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

The present invention relates to an optical touch liquid crystal display device comprising a liquid crystal display panel for displaying an image, a backlight unit disposed beneath the liquid crystal display panel for providing a backlight for the liquid crystal display panel, a bezel, at least a light emitting element, and at least an optical sensor. The bezel comprises an inside surface having a horizontal surface and a vertical surface. The bezel surrounds and fixes the liquid crystal display panel and the backlight unit. The light emitting unit is disposed on the inside surface of the bezel for providing light to form an optical matrix at the image display side of the liquid crystal display panel. The optical sensor is disposed on the inside surface of the bezel for detecting a touch on the liquid crystal display panel.

Claims

1. An optical touch liquid crystal display device, comprising:

a liquid crystal display panel for displaying an image;

a backlight unit disposed beneath the liquid crystal display panel for providing a backlight for the liquid crystal display panel;

a bezel comprising an inside surface having a horizontal surface and a vertical surface, the bezel surrounding and fixing the liquid crystal display panel and the backlight unit;

at least a light emitting element disposed on the inside surface of the bezel for providing light to form an optical matrix at an image display side of the liquid crystal display panel; and

at least an optical sensor disposed on the inside surface of the bezel for detecting a touch on the liquid crystal display panel.

2. The optical touch liquid crystal display device of claim 1, wherein the light comprises invisible light.

3. The optical touch liquid crystal display device of claim 1, wherein the light comprises infrared light (IR) or far-infrared light.

4. The optical touch liquid crystal display device of claim 1, wherein the at least a light emitting element is disposed on the horizontal surface of the inside surface of the bezel.

5. The optical touch liquid crystal display device of claim 1, wherein the at least a light emitting element is disposed on the vertical surface of the inside surface of the bezel.

6. The optical touch liquid crystal display device of claim 1, wherein the optical touch liquid crystal display device comprises two optical sensors disposed on the inside surface at two adjacent corners of the bezel respectively for detecting a touch on the liquid crystal display panel.

7. The optical touch liquid crystal display device of claim 1, wherein, the optical touch liquid crystal display device comprises four optical sensors disposed on the inside surface at four corners of the bezel respectively, the two adjacent ones of the four optical sensors are for detecting a touch, and the other two adjacent ones are for detecting an erroneous action.

8. The optical touch liquid crystal display device of claim 1, further comprising a light guide plate or a diffusing plate disposed on the inside surface of the bezel and at a light-emitting side of the at least a light emitting element, wherein the light passes the light guide plate or the diffusing plate and forms the optical matrix on the image display side of the liquid crystal display panel.

9. The optical touch liquid crystal display device of claim 1, further comprising a light-reflecting device disposed on the inside surface of the bezel at a position opposite the at least a light emitting element for reflecting the light.

10. The optical touch liquid crystal display device of claim 1, wherein the bezel and the backlight unit are buckled up each other.

11. The optical touch liquid crystal display device of claim 1, wherein the at least an optical sensor is disposed on the inside surface of the bezel.

12. The optical touch liquid crystal display device of claim 1, wherein the at least an optical sensor is rotatable.