OPTICAL TOUCH DEVICE AND TOUCH DISPLAY DEVICE HAVING THE SAME

• US 20170139498A1
• Filed: 12/28/2015
• Published: 05/18/2017
• Est. Priority Date: 05/12/2015
• Status: Abandoned Application

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhang, Chunfang, Wu, Zhongbao, Zou, Xiangxiang, Yang, Zezhou
• Application Number:
  US15/107,088
• Publication Number:
  US 20170139498A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• 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

The present application discloses an optical touch device comprising a light transmission layer comprising a first total internal reflection (TIR) surface and a second TIR surface facing the first TIR surface, a first side surface for connecting the first TIR surface and the second TIR surface on a first side, and a second side surface for connecting the first TIR surface and the second TIR surface on a second side opposite to the first side; a light source on a side of the first TIR surface distal to the second TIR surface for emitting a light beam, the light source is proximal to the first side; and a detector on the side of the first TIR surface distal to the second TIR surface, for detecting the light beam passed through the light transmission layer and transmitted into the detector, the detector is proximal to the second side. A first side angle between the first side surface and the first TIR surface is an acute angle. A second side angle between the second side surface and the first TIR surface is an acute angle.

Claims

1. An optical touch device, comprising:

a light transmission layer comprising a first total internal reflection (TIR) surface and a second TIR surface facing the first TIR surface, a first side surface for connecting the first TIR surface and the second TIR surface on a first side, and a second side surface for connecting the first TIR surface and the second TIR surface on a second side opposite to the first side;

a light source on a side of the first TIR surface distal to the second TIR surface for emitting a light beam, the light source is proximal to the first side; and

a detector on the side of the first TIR surface distal to the second TIR surface, for detecting the light beam passed through the light transmission layer and transmitted into the detector, the detector is proximal to the second side;

wherein a first side angle between the first side surface and the first TIR surface, and a second side angle between the second side surface and the first TIR surface, each is an acute angle.

2. The optical touch device of claim 1, wherein each of the first side angle and the second side angle is in the range of about 30°

to about 50°

.

3. The optical touch device of claim 1, wherein the first side angle and the second side angle are both approximately 38°

.

4. The optical touch device of claim 1, further comprising a first TIR layer on the first side and a second TIR layer on the second side.

5. The optical touch device of claim 1, wherein the light source is fully laminated onto the first TIR surface by a transparent optical adhesive.

6. The optical touch device of claim 1, wherein the detector is fully laminated onto the first TIR surface by a transparent optical adhesive.

7. The optical touch device of claim 1, wherein the light source is fully laminated onto the first TIR surface by a transparent optical adhesive, and the detector is fully laminated onto the first TIR surface by a transparent optical adhesive.

8. The optical touch device of claim 7, wherein the refractive index of the transparent optical adhesive is between around 1.3 and around 1.7.

9. The optical touch device of claim 8, wherein the refractive index of the transparent optical adhesive is 1.3.

10. The optical touch device of claim 1, wherein the optical touch device comprises a plurality of the light sources and a plurality of the detectors, the light transmission layer further comprises a third side surface for connecting the first TIR surface and the second TIR surface on a third side, and a fourth side surface for connecting the first TIR surface and the second TIR surface on a fourth side opposite to the third side;

the plurality of the light sources and the plurality of the detectors are arranged alternately and spaced apart, the plurality of the light sources and the plurality of the detectors are proximal to the first side, the second side, the third side, or the fourth side.

11. The optical touch device of claim 1, wherein the light source comprises a first printed circuit board and a light transmission terminal connected to the first printed circuit board, the light transmission terminal is on a side of the first printed circuit board proximal to the light transmission layer.

12. The optical touch device of claim 1, wherein the detector comprises a second printed circuit board and a light receiving terminal connected to the second first printed circuit board, the light receiving terminal is on a side of the second printed circuit board proximal to the light transmission layer.

13. The optical touch device of claim 1, wherein the light transmission layer is made of glass.

14. The optical touch device of claim 1, wherein the light utilization efficiency of the optical touch device from the light source to the detector is higher than 10%.

15. The optical touch device of claim 1, wherein the light utilization efficiency of the optical touch device from the light source to the detector is higher than 20%.

16. A touch display device comprising an optical touch device of claim 1.