TOUCH-SENSING DISPLAY DEVICE

• US 20120162126A1
• Filed: 11/22/2011
• Published: 06/28/2012
• Est. Priority Date: 12/22/2010
• Status: Abandoned Application

• Current Assignee: Integrated Digital Technologies, Inc. (InterDigital, Inc.)
• Original Assignee: Integrated Digital Technologies, Inc. (InterDigital, Inc.)
• Inventors: Yuan, Chih-Ming, Liaw, Shen-Tai, Hwang, Nae-Jye
• Application Number:
  US13/301,803
• Publication Number:
  US 20120162126A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A touch-sensing display device including a touch-sensing panel and a touch-sensing light source therearound is provided. The touch-sensing panel has a display surface and includes a pixel array including pixel structures and a display medium disposed on the pixel array. One pixel structure includes a scan line, a data line intersected with the scan line, an active element electrically connected to the scan line and the data line, a pixel electrode electrically connected to the active element, a capacitor electrode line electrically coupled with the pixel electrode, a readout line parallel to the data line, and a sensing element electrically connected to the scan line and the readout line and having a sensing surface facing the display surface. The touch-sensing light source provides a touch-sensing light to form a uniformed light field at the display surface. And at least one filter layer is provided above the sensing element.

Claims

1. A touch-sensing display device comprising:

a touch-sensing panel having a display surface and comprising a pixel array and a display medium disposed on the pixel array, wherein the pixel array comprises a plurality of pixel structures, and at least one of the pixel structures comprises;

a scan line and a data line, intersected with each other;

an active element, electrically connected to the scan line and the data line;

a pixel electrode, electrically connected to the active element;

a capacitor electrode line, electrically coupling with the pixel electrode;

a readout line, disposed parallel to the data line;

a sensing element, electrically connected to the scan line and the readout line, wherein the sensing element is connected to the capacitor electrode line and a sensing surface of the sensing element faces to the display surface; and

at least one touch-sensing light source disposed around the touch-sensing panel and providing a touch-sensing light to form a uniformed light field at the display surface.

2. The touch-sensing display device according to claim 1, further comprising a backlight unit disposed at a back surface of the touch-sensing panel opposite to the display surface and the backlight unit emitting a display light toward the display surface.

3. The touch-sensing display device according to claim 2, wherein the touch-sensing light source is disposed in the backlight unit for emitting the touch-sensing light toward the display surface.

4. The touch-sensing display device according to claim 1, wherein a wavelength of the display light is different from a wavelength of the touch-sensing light.

5. The touch-sensing display device according to claim 1, wherein the touch-sensing light is an invisible light.

6. The touch-sensing display device according to claim 1, wherein the touch-sensing light source is disposed in front of the display surface and emits the touch-sensing light toward the display surface to form the uniformed light field at the display surface.

7. The touch-sensing display device according to claim 6, wherein the touch-sensing light source comprises at least two light emitting diodes surrounding the touch-sensing panel.

8. The touch-sensing display device according to claim 6, wherein the touch-sensing light source comprises a laser light source and a lens in front of the laser light source and the touch-sensing light source is capable of providing the touch-sensing light with a shape of a curtain substantially parallel to the display surface.

9. The touch-sensing display device according to claim 1, wherein the touch-sensing light source comprises a light emitting source and a light guide, the light emitting source is located beside the light guide and emits the touch-sensing light, and the touch-sensing light is substantially transmitted inside the light guide by a total inner reflection effect of the light guide to form the uniform light field.

10. The touch-sensing display device according to claim 1, wherein the touch-sensing light source comprises a light emitting source and a light diffuser, the light emitting source is located beside the light diffuser and emits the touch-sensing light toward the light diffuser, and the touch-sensing light is substantially scattered outward from the light diffuser to form the uniform light field.

11. The touch-sensing display device according to claim 10, wherein the light diffuser has a plurality of diffusing particles distributed therein.

12. The touch-sensing display device according to claim 1, wherein the touch-sensing light source is disposed beside the display medium and emits the touch-sensing light toward the display medium to form the uniformed light field.

13. The touch-sensing display device according to claim 1, wherein the touch-sensing panel further comprises a filter layer and the display medium is disposed between the filter layer and the pixel array.

14. The touch-sensing display device according to claim 13, wherein the filter layer comprises a red filter, a green filter, and a blue filter alternatively arranged above the pixel array.

15. The touch-sensing display device according to claim 14, wherein at least one of the red filter, the green filter, and the blue filter is further located above the sensing element.

16. The touch-sensing display device according to claim 13, wherein the filter layer comprises a filter capable of blocking the visible light located above the sensing surface of the sensing element.

17. The touch-sensing display device according to claim 1, wherein the touch-sensing panel further comprises a black matrix located above the sensing surface of the sensing element.

18. The touch-sensing display device according to claim 17, wherein the black matrix is capable of allowing only near infra-red to pass through.