Touch panel

Patent metadata

Field	Value
Publication number	US-9830020-B2
Application number	US-201414555919-A
Country	US
Kind code	B2
Filing date	Nov 28, 2014
Priority date	Oct 27, 2014
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The present disclosure relates to a touch panel. The touch panel includes a substrate; one or more infrared light-emitting devices; an infrared total reflection coverplate that is deformable in response to a touch of a touching object; an infrared sensing layer including at least one sensing wire in a first direction and at least one sensing wire in a second direction. The sensing wires in the first direction and the sensing wires in the second direction are insulated from each other and are made of photoconductive material sensitive to the infrared light emitted from the infrared light-emitting device.

First claim

The invention claimed is:

1. A touch panel, comprising:
a substrate;
one or more infrared light-emitting devices;
an infrared total reflection coverplate that is deformable in response to a touch of a touching object; and
an infrared sensing layer comprising at least one sensing wire in a first direction and at least one sensing wire in a second direction, wherein the at least one sensing wire in the first direction and the at least one sensing wire in the second direction are insulated from each other and are made of photoconductive material sensitive to the infrared light emitted from the infrared light-emitting devices; and
wherein the infrared total reflection coverplate comprises
a transparent substrate;
a gradient-refractive-index ITO layer arranged on an outer side of the transparent substrate along a direction of emergent light from the infrared light-emitting devices and comprising n layers of ITOs, the n layers of ITOs being stackedly arranged in sequence along the direction of the emergent light and having respective refractive indices to the infrared light that increase progressively along the direction of the emergent light, the refractive indices of the gradient-refractive-index ITO layer to the infrared light being larger than that of the transparent substrate; and
an optically less dense transparent substrate or coat having a refractive index to the infrared light that is less than that of the nth layer of ITO in the gradient-refractive-index ITO layer.

2. The touch panel according to claim 1 , wherein the touch panel further comprises an OLED device.

3. The touch panel according to claim 2 , wherein the one or more infrared light-emitting devices are arranged between the substrate and the infrared total reflection coverplate, and wherein the infrared sensing layer is arranged on an outer side of the infrared total reflection coverplate along the direction of the emergent light from the infrared light-emitting devices.

4. The touch panel according to claim 2 , wherein the one or more infrared light-emitting devices are arranged between the substrate and the infrared sensing layer, and wherein the infrared total reflection coverplate is arranged on an outer side of the infrared sensing layer along the direction of the emergent light from the infrared light-emitting devices.

5. The touch panel according to claim 2 , wherein the transparent substrate has a refractive index of 1.5-1.7 to the infrared light, and wherein the gradient-refractive-index ITO layer has a refractive index of 1.7-1.8 to the infrared light.

6. The touch panel according to claim 5 , wherein the photoconductive material is ITO doped with polyvinyl carbazole.

7. The touch panel according to claim 6 , wherein the infrared light emitted from the infrared light-emitting devices have a wavelength of 800-1000 nm.

8. The touch panel according to claim 5 , wherein the at least one sensing wire in the first direction is perpendicular to the at least one sensing wire in the second direction.

9. The touch panel according to claim 1 , wherein the one or more infrared light-emitting devices are arranged between the substrate and the infrared total reflection coverplate, and wherein the infrared sensing layer is arranged on an outer side of the infrared total reflection coverplate along the direction of the emergent light from the infrared light-emitting devices.

10. The touch panel according to claim 1 , wherein the one or more infrared light-emitting devices are arranged between the substrate and the infrared sensing layer, and wherein the infrared total reflection coverplate is arranged on an outer side of the infrared sensing layer along the direction of the emergent light from the infrared light-emitting devices.

11. The touch panel according to claim 1 , wherein the transparent substrate has a refractive index of 1.5-1.7 to the infrared light, and wherein the gradient-refractive-index ITO layer has a refractive index of 1.7-1.8 to the infrared light.

12. The touch panel according to claim 1 , wherein the photoconductive material is ITO doped with polyvinyl carbazole.

13. The touch panel according to claim 12 , wherein the infrared light emitted from the infrared light-emitting devices have a wavelength of 800-1000 nm.

14. The touch panel according to claim 1 , wherein the at least one sensing wire in the first direction is perpendicular to the at least one sensing wire in the second direction.

Assignees

• Boe Technology Group Co Ltd
• Ordos Yuansheng Optoelectronics Co Ltd

Inventors

• Xiao Ang

Classifications

• G06F2203/04109

  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 title

• G06F3/0421 Primary

  by interrupting or reflecting a light beam, e.g. optical touch-screen · CPC title