OPTICAL TOUCH MODULE

• US 20100214269A1
• Filed: 07/30/2009
• Published: 08/26/2010
• Est. Priority Date: 02/25/2009
• Status: Abandoned Application

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Wang, Wei Chung, Chen, Hui Hsuan
• Application Number:
  US12/512,630
• Publication Number:
  US 20100214269A1
• 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

An optical touch module is adapted to provide a touch area. At least one sensor is disposed at a corner of the touch area. The optical touch module includes at least one light emitting element and at least one waveguide element. The waveguide element is disposed on at least one side of the touch area, for guiding and emitting light rays provided by the light emitting element to the touch area. Each waveguide element includes a light incident surface and a light emitting surface. The light incident surface faces the light emitting element. The light emitting surface faces the touch area. Thereby, the light rays emitted from the light emitting element are distributed on the touch area through the waveguide element, so as to lower the luminance of the light emitting element and reduce the current consumption.

Claims

1. An optical touch module, adapted to provide a touch area, wherein at least one sensor is disposed at a corner of the touch area, the module comprising:

at least one light emitting element, for providing a light ray; and

at least one waveguide element, disposed on at least one side of the touch area, for guiding and emitting the light ray to the touch area, and each comprising;

a light incident surface, facing the at least one light emitting element; and

a light emitting surface, facing the touch area.

2. The optical touch module according to claim 1, wherein a shape of the light incident surface is corresponding to that of the at least one light emitting element.

3. The optical touch module according to claim 1, wherein the at least one light emitting element is located at a corner of the touch area opposite to the at least one sensor.

4. The optical touch module according to claim 1, further comprising:

a substrate, located below the touch area.

5. The optical touch module according to claim 4, wherein the at least one light emitting element is located on a surface of the substrate facing the touch area.

6. The optical touch module according to claim 4, wherein the substrate is an indium tin oxide (ITO) glass, and the at least one light emitting element is located on a surface of the substrate facing the touch area.

7. The optical touch module according to claim 1, wherein the light emitting surface has a diffusion structure.

8. The optical touch module according to claim 1, wherein the touch area is a polygon, and the at least one waveguide element is disposed at one side of the polygonal touch area.