TOUCH DISPLAY PANEL AND OPTICAL TOUCH PANEL THEREOF

• US 20140055418A1
• Filed: 08/20/2013
• Published: 02/27/2014
• Est. Priority Date: 08/21/2012
• Status: Abandoned Application

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Hsieh, Tsung-Yen, Fang, Chong-Yang, Lin, Tsung-Hsien
• Application Number:
  US13/970,626
• Publication Number:
  US 20140055418A1
• Time in Patent Office: Days
• US Class Current: 345/175
• 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

Abstract

An optical touch panel includes a transparent light guide plate, at least one light emitting device, a bottom reflective sheet and at least one light sensing device. The transparent light guide plate has a top surface, a bottom surface and at least one light incident surface. The top surface of the transparent light guide plate is for touch input. The light emitting device faces the light incident surface for emitting a light beam toward the light incident surface. The bottom reflective sheet faces the bottom surface of the transparent light guide plate. A light reflection space is formed between the bottom surface of the transparent light guide plate and the reflective sheet. The light sensing device is disposed on at least one side of the light reflection space for sensing the light beam reflected from the light reflection space.

Claims

1. An optical touch panel, comprising:

a transparent light guide plate having a top surface, a bottom surface and at least one light incident surface, wherein the top surface is for touch inputting;

at least one light emitting device facing the light incident surface of the transparent light guide plate for emitting a light beam toward the light incident surface;

a bottom reflective sheet facing the bottom surface of the transparent light guide plate, wherein a light reflection space exists between the bottom surface of the transparent light guide plate and the bottom reflective sheet; and

at least one light sensing device disposed on at least one side of the light reflection space for sensing the light beam reflected by the light reflection space.

2. The optical touch panel of claim 1, wherein the at least one light emitting device comprises two light emitting devices, respectively disposed at two adjacent corners of the transparent light guide plate.

3. The optical touch panel of claim 1, wherein the at least one light emitting device comprises two light emitting devices, respectively disposed on two adjacent light incident surfaces of the transparent light guide plate.

4. The optical touch panel of claim 1, wherein the at least one light emitting device comprises four light emitting devices, respectively disposed on four adjacent light incident surfaces of the transparent light guide plate.

5. The optical touch panel of claim 1, wherein the at least one light sensing device comprises two or more light sensing devices, respectively disposed at two adjacent corners of the light reflection space.

6. The optical touch panel of claim 1, wherein the light incident surface of the transparent light guide plate has a plurality of micro structures for diffusing the light beam entering the transparent light guide plate.

7. The optical touch panel of claim 1, wherein the light beam emitted by the light emitting device comprises a visible light beam or an invisible light beam.

8. The optical touch panel of claim 1, further comprising a side reflective sheet, wherein the transparent light guide plate has at least one side surface, and the side reflective sheet is disposed on the side surface of the transparent light guide plate for reflecting the light beam.

9. A touch display panel, comprising:

a display panel having a display surface; and

the optical touch panel of claim 1, wherein the bottom surface of the transparent light guide plate faces the display surface of the display panel.

10. A touch display panel, comprising:

a display panel having a display surface; and

an optical touch panel, comprising;

a transparent light guide plate having a top surface, a bottom surface and at least one light incident surface, wherein the top surface is for touch inputting, the bottom surface faces the display surface of the display panel, and an light reflection space exists between the bottom surface and the display surface of the display panel;

at least one light emitting device facing the light incident surface of the transparent light guide plate for emitting a light beam toward the light incident surface; and

at least one light sensing device disposed on at least one side of the light reflection space for sensing the light beam reflected by the light reflection space.

11. An optical touch panel, comprising:

a transparent light guide plate having a top surface, a bottom surface and a plurality of side surfaces connected to the top surface and the bottom surface, wherein the top surface is for touch inputting;

a light emitting array for emitting a light beam toward the transparent light guide plate, wherein the light emitting array comprises a plurality of light emitting devices;

a light sensing array for sensing the light beam coming out of the transparent light guide plate, wherein the light sensing array comprises a plurality of light sensing devices; and

a first light coupling layer disposed between the transparent light guide plate and the light sensing array for coupling the light beam inside the transparent light guide plate to the light sensing array.

12. The optical touch panel of claim 11, wherein the light emitting array faces at least one of the side surfaces of the transparent light guide plate, and the light sensing array faces at least one of the side surfaces of the transparent light guide plate or the bottom surface of the transparent light guide plate.

13. The optical touch panel of claim 11, wherein the light emitting array faces the bottom surface of the transparent light guide plate, and the light sensing array faces at least one of the side surfaces of the transparent light guide plate or the bottom surface of the transparent light guide plate.

14. The optical touch panel of claim 13, further comprising a light scattering layer disposed on the top surface of the transparent light guide plate and corresponding to the light emitting array for scattering the light beam inside the transparent light guide plate.

15. The optical touch panel of claim 11, wherein the first light coupling layer comprises an optical clear adhesive or a micro scattering structure layer.

16. The optical touch panel of claim 15, wherein the optical clear adhesive comprises scattering particles.

17. The optical touch panel of claim 11, further comprising a second light coupling layer disposed between the transparent light guide plate and the light emitting array for coupling the light beam emitted by the light emitting array to the transparent light guide plate.

18. The optical touch panel of claim 17, wherein the second light coupling layer comprises an optical clear adhesive or a micro scattering structure layer.

19. The optical touch panel of claim 18, wherein the optical clear adhesive comprises scattering particles.

20. The optical touch panel of claim 11, wherein the side surfaces of the transparent light guide plate comprise a first side surface, a second side surface, a third side surface and a fourth side surface, the first side surface is opposite to the third side surface, the second side surface is opposite to the fourth side surface, the bottom surface of the transparent light guide plate comprises a first peripheral region, a second peripheral region, a third peripheral region and a fourth peripheral region disposed adjacent to the first side surface, the second side surface, the third side surface and the fourth side surface, respectively.

21. The optical touch panel of claim 20, wherein the light emitting devices of the light emitting array face the first side surface and the second side surface of the transparent light guide plate, the light sensing devices of the light sensing array face the third side surface and the fourth side surface of the transparent light guide plate, and the light emitting devices are corresponding to the light sensing devices, respectively.

22. The optical touch panel of claim 20, wherein the light emitting devices of the light emitting array face the first side surface and the second side surface of the transparent light guide plate, the light sensing devices of the light sensing array face the third peripheral region and the fourth peripheral region of the bottom surface of the transparent light guide plate, and the light emitting devices are corresponding to the light sensing devices, respectively.

23. The optical touch panel of claim 20, wherein the light emitting devices of the light emitting array face the first peripheral region and the second peripheral region of the bottom surface of the transparent light guide plate, the light sensing devices of the light sensing array face the third peripheral region and the fourth peripheral region of the bottom surface of the transparent light guide plate, and the light emitting devices are corresponding to the light sensing devices, respectively.

24. The optical touch panel of claim 20, wherein the light emitting devices of the light emitting array face the first peripheral region and the second peripheral region of the bottom surface of the transparent light guide plate, the light sensing devices of the light sensing array face the third side surface and the fourth side surface of the transparent light guide plate, and the light emitting devices are corresponding to the light sensing devices, respectively.

25. The optical touch panel of claim 20, wherein the light emitting devices of the light emitting array face the first peripheral region, the second peripheral region, the third peripheral region and the fourth peripheral region of the bottom surface of the transparent light guide plate, the light sensing devices of the light sensing array face the first peripheral region, the second peripheral region, the third peripheral region and the fourth peripheral region of the bottom surface of the transparent light guide plate, and the light emitting devices are corresponding to the light sensing devices, respectively.

26. The optical touch panel of claim 20, further comprising a reflective sheet, wherein the light emitting devices of the light emitting array face the first peripheral region and the second peripheral region of the bottom surface of the transparent light guide plate, the light sensing devices of the light sensing array face the first peripheral region and the second peripheral region of the bottom surface of the transparent light guide plate, and the reflective sheet is disposed on the third side surface and the fourth side surface of the transparent light guide plate for reflecting the light beam emitted by the light emitting devices to the light sensing devices.

27. A touch display panel, comprising:

a display panel having a display surface; and

the optical touch panel of claim 11, wherein the bottom surface of the transparent light guide plate faces the display surface of the display panel.

28. The touch display panel of claim 27, further comprising a medium layer disposed between the display surface of the display panel and the bottom surface of the transparent light guide plate, wherein a refractive index of the medium layer is lower than that of the transparent light guide plate.