OPTICAL TOUCH DISPLAY PANEL AND TOUCH SENSING METHOD THEREOF

• US 20130063398A1
• Filed: 12/19/2011
• Published: 03/14/2013
• Est. Priority Date: 09/08/2011
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Wu, Chao-Hui, Ko, Chien-Chuan
• Application Number:
  US13/329,344
• Publication Number:
  US 20130063398A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

An optical touch display panel and a touch sensing method thereof are provided. The optical touch display panel includes a scan line, a readout line, and a photosensing unit. The photosensing unit is activated in response to a scan signal received by the scan line, and reacts a photosensing current on the readout line according to the scan signal and a reference level.

Claims

1. An optical touch display panel, comprising:

a first scan line;

a readout line; and

a photosensing unit, coupled to the first scan line and the readout line, activated in response to a first scan signal received by the first scan line, and reacting a photo sensing current on the readout line according to the first scan signal and a reference level.

2. The optical touch display panel according to claim 1, wherein the photosensing unit comprises:

a switching transistor, having a gate coupled to the first scan line and a first source/drain coupled to the readout line; and

a photosensing transistor, having a gate coupled to the first scan line, a first source/drain coupled to a second source/drain of the switching transistor and a second source/drain for receiving the reference level.

3. The optical touch display panel according to claim 2, further comprising:

a pixel unit, corresponding to the photosensing unit, wherein the photosensing unit is embedded in the pixel unit.

4. The optical touch display panel according to claim 3, wherein the reference level is a common voltage applied to the pixel unit.

5. The optical touch display panel according to claim 4, further comprising:

a black matrix, located on the photosensing transistor, wherein the black matrix located on the photosensing transistor has no holes.

6. The optical touch display panel according to claim 3, further comprising:

a second scan line, coupled to the second source/drain of the photosensing transistor, wherein the reference level is a disable level of a second scan signal received by the second scan line.

7. The optical touch display panel according to claim 6, further comprising:

a black matrix, located on the photosensing transistor, wherein the black matrix located on the photosensing transistor has a corresponding hole.

8. A touch sensing method of an optical touch display panel, comprising:

providing a photosensing unit embedded in a pixel unit of the optical touch display panel, wherein the photosensing unit is coupled to a first scan line and a readout line of the optical touch display panel;

activating the photosensing unit in response to a first scan signal received by the first scan line and reacting a photosensing current on the readout line according to the first scan signal and a reference level; and

interpreting the photosensing current to acquire if a touch event occurs.

9. The touch sensing method of the optical touch display panel according to claim 8, wherein the reference level is a common voltage applied to the pixel unit.

10. The touch sensing method of the optical touch display panel according to claim 8, wherein the photosensing unit is further coupled to a second scan line of the optical touch display panel, and the reference level is a disable level of a second scan signal received by the second scan line.