Touch-sensing display panel, touch panel, touch-sensing device and touch-sensing circuit

• US 8,723,835 B2
• Filed: 11/30/2010
• Issued: 05/13/2014
• Est. Priority Date: 11/30/2010
• Status: Active Grant

• Current Assignee: AUO Corp.
• Original Assignee: AU Optronics Corporation
• Inventors: Chiu, Hao-Lin, Huang, Chun-Yao, Kao, Yih-Chyun, Tai, Ya-Hsiang, Chou, Lu-Sheng, Lin, Kuan-Da
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Cohen, Yaron
• Application Number:
  US12/955,919
• Publication Number:
  US 20120133607A1
• Time in Patent Office: 1,260 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The present application provides a touch-sensing display panel comprising a display panel and a touch-sensing device disposed above the display panel. The touch-sensing device comprises a plurality of select lines, a plurality of readout lines and a plurality of capacitive touch-sensing units arranged in array. Each of the capacitive touch-sensing units comprises a transistor and a touch-sensing pad, each of the transistors comprises a gate electrode electrically connected to one of the select lines, a source electrode electrically connected to a reference voltage, a drain electrode electrically connected to one of the readout lines, and a channel layer electrically coupled to the touch-sensing pad.

Claims

1. A touch-sensing display panel, comprising:

a display panel; and

a touch-sensing device disposed above the display panel, the touch-sensing device comprising;

a plurality of select lines;

a plurality of readout lines; and

a plurality of capacitive touch-sensing units arranged in array, each of the capacitive touch-sensing units comprising a transistor and a touch-sensing pad, each of the transistors comprising a gate electrode, a source electrode, a drain electrode, a gate dielectric layer and a channel layer, the gate electrode being electrically connected to one of the select lines correspondingly, the source electrode being electrically connected to a reference voltage, the drain electrode being electrically connected to one of the readout lines correspondingly, and the channel layer being electrically connected between the source electrode and the drain electrode, the gate dielectric layer being located between the gate electrode and the channel layer, the touch-sensing pad made of a conductive material being electrically coupled and directly connected to the channel layer, and the touch-sensing pad being not directly contacted the source electrode and the drain electrode and spaced apart from the source electrode and the drain electrode with a gap.

2. The touch-sensing display panel according to claim 1, wherein the display panel comprises a liquid crystal display panel, a plasma display panel, an organic electroluminescent display panel, an electrophoretic display panel or an electro-wetting display panel.

3. The touch-sensing display panel according to claim 1, further comprising an auxiliary substrate, wherein the touch-sensing device is disposed on a surface of the auxiliary substrate.

4. The touch-sensing display panel according to claim 1, further comprising a cover substrate, wherein the touch-sensing device is disposed between the cover substrate and the display panel.

5. The touch-sensing display panel according to claim 4, wherein the touch-sensing device is disposed on an inner surface of the cover substrate.

6. The touch-sensing display panel according to claim 1, wherein the touch-sensing device is disposed on a top surface of the display panel.

7. The touch-sensing display panel according to claim 1, wherein each of the source electrodes is electrically connected to one of the select lines correspondingly.

8. The touch-sensing display panel according to claim 1, wherein the display panel has a display region, the touch-sensing device has a touch-sensing region corresponding the display region, and in the touch-sensing region, the select lines, the readout lines and the transistors are transparent.

9. The touch-sensing display panel according to claim 1, wherein a material of the channel layer comprises indium gallium zinc oxide.

10. The touch-sensing display panel according to claim 1, wherein the touch-sensing pad extends over and is in contact with an upper surface of the channel layer, and the channel layer is above the gate electrode.

11. The touch-sensing display panel according to claim 1, wherein further comprising a plurality of resistors and a plurality of reference lines, wherein each of the resistor is electrically connected between one of the touch-sensing pads and one of the reference line correspondingly.

28. The touch-sensing device according to claim 1, wherein touch-sensing pad is not directly electrically connected to the source electrode and the drain electrode.

12. A touch panel, comprising:

a substrate;

a plurality of select lines disposed on the substrate;

a plurality of readout lines disposed on the substrate; and

a plurality of capacitive touch-sensing units disposed on the substrate and arranged in array, each of the capacitive touch-sensing units comprising a transistor and a touch-sensing pad, each of the transistors comprising a gate electrode, a source electrode, a drain electrode, a gate dielectric layer and a channel layer, the gate electrode being electrically connected to one of the select lines correspondingly, the source electrode being electrically connected to a reference voltage, the drain electrode being electrically connected to one of the readout lines correspondingly, and the channel layer being electrically connected between the source electrode and the drain electrode, the gate dielectric layer being located between the gate electrode and the channel layer, the touch-sensing pad made of a conductive material being electrically coupled and directly connected to the channel layer and the touch-sensing pad being not directly contacted the source electrode and the drain electrode and spaced apart from the source electrode and the drain electrode with a gap.

13. The touch panel according to claim 12, wherein the source electrode in one of the capacitive touch-sensing units is electrically connected to one of the select lines.

14. The touch panel according to claim 12, wherein the select lines, the readout lines and the transistors are transparent.

15. The touch panel according to claim 12, wherein a material of the channel layer comprises indium gallium zinc oxide.

16. The touch panel according to claim 12, wherein the touch-sensing pad extends over and is in contact with an upper surface of the channel layer, and the channel layer is above the gate electrode.

17. The touch panel according to claim 12, wherein further comprising a plurality of resistors and a plurality of reference lines, wherein each of the resistor is electrically connected between one of the touch-sensing pads and one of the reference line correspondingly.

30. The touch panel according to claim 12, wherein touch-sensing pad is not directly electrically connected to the source electrode and the drain electrode.

18. A touch-sensing device, comprising:

a select line;

a readout line;

a transistor, comprising a gate electrode, a source electrode, a drain electrode, a gate dielectric layer and a channel layer, the gate electrode being electrically connected to the select line, the source electrode being electrically connected to a reference voltage, the drain electrode being electrically connected to the readout line, the channel layer being electrically connected between the source electrode and the drain electrode, the gate dielectric layer being located between the gate electrode and the channel layer; and

a touch-sensing pad, made of a conductive material and being electrically coupled and directly connected to the channel layer, and the touch-sensing pad being not directly contacted the source electrode and the drain electrode and spaced apart from the source electrode and the drain electrode with a gap.

19. The touch-sensing device according to claim 18, wherein the source electrode is electrically connected to the select line.

20. The touch-sensing device according to claim 18, wherein the select line, the readout line and the transistor are transparent.

21. The touch-sensing device according to claim 18, wherein a material of the channel layer comprises amorphous silicon or oxide semiconductor.

22. The touch-sensing device according to claim 18, wherein a material of the channel layer comprises indium gallium zinc oxide.

23. The touch-sensing device according to claim 18, wherein the touch-sensing pad extends over and is in contact with an upper surface of the channel layer, and the channel layer is above the gate electrode.

24. The touch-sensing device according to claim 18, further comprising a resistor and a reference line, wherein the resistor is electrically connected between the touch-sensing pad and the reference line.

29. The touch-sensing device according to claim 18, wherein touch-sensing pad is not directly electrically connected to the source electrode and the drain electrode.

25. A touch-sensing circuit, comprising:

a select line;

a readout line;

a transistor, comprising a gate electrode, a source electrode, a drain electrode and a channel, the gate electrode being electrically connected to the select line, the source electrode being electrically connected to a reference voltage, the drain electrode being electrically connected to the readout line, the channel electrically connected between the source electrode and the drain electrode; and

a touch-sensing electrode, being electrically coupled and directly connected to the channel, and touch-sensing electrode being not directly electrically connected to the source electrode and the drain electrode and spaced apart from the source electrode and the drain electrode with a gap.

26. The touch-sensing circuit according to claim 25, wherein the source electrode is electrically connected to the select line.

27. The touch-sensing circuit according to claim 25, further comprising a resistor and a reference line, wherein the resistor is electrically connected between the touch-sensing electrode and the reference line.