Free form touch device

• US 10,732,781 B2
• Filed: 01/07/2019
• Issued: 08/04/2020
• Est. Priority Date: 08/17/2018
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lee, Chia-Chi, Chen, Zeng-De
• Primary Examiner(s): Chang, Kent W
• Assistant Examiner(s): Bibbee, Chayce R
• Application Number:
  US16/240,794
• Publication Number:
  US 20200057516A1
• Time in Patent Office: 575 Days
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A free form touch device includes a substrate, a first switching device, a first touch electrode, a second switching device, and a second touch electrode. The first switching device includes a first channel layer, a first gate, a first source, and a first drain. An overlapping width of the first gate and the first channel layer is W1, and an overlapping length of the first gate and the first channel layer is L1. The first touch electrode is electrically connected with the first switching device. An area of the first touch electrode is A1. The second switching device includes a second channel layer, a second gate, a second source, and a second drain. An overlapping width of the second gate and the second channel layer is W2, and an overlapping length of the second gate and the second channel layer is L2, W1/L1>W2/L2. The second touch electrode is electrically connected with the second switching device. An area of the second touch electrode is A2, and A1>A2.

Claims

1. A free form touch device, comprising:

a substrate;

a first switching device, comprising a first channel layer, a first gate, a first source and a first drain, wherein an overlapping width of the first gate and the first channel layer is W1, and an overlapping length of the first gate and the first channel layer is L1;

a first touch electrode, located on the substrate, and electrically connected with the first switching device, wherein an area of the first touch electrode is A1;

a second switching device, comprising a second channel layer, a second gate, a second source and a second drain, wherein an overlapping width of the second gate and the second channel layer is W2, and an overlapping length of the second gate and the second channel layer is L2, wherein W1/L1>

W2/L2; and

a second touch electrode, located on the substrate, and electrically connected with the second switching device, wherein an area of the second touch electrode is A2, and A1>

A2.

2. The free form touch device according to claim 1, further comprising:

a third switching device, having a third channel layer, a third gate, a third source and a third drain, wherein an overlapping width of the third gate and the third channel layer is W3, and an overlapping length of the third gate and the third channel layer is L3, wherein W2/L2>

W3/L3; and

a third touch electrode, located on the substrate, and electrically connected with the third switching device, wherein an area of the third touch electrode is A3, and A2>

A3.

3. The free form touch device according to claim 1, further comprising:

a first capacitor, electrically connected between the first switching device and the first touch electrode; and

a second capacitor, electrically connected between the second switching device and the second touch electrode, wherein a capacitance of the first capacitor is less than a capacitance of the second capacitor.

4. The free form touch device according to claim 3, wherein the first capacitor comprises a first main-electrode and a first sub-electrode, and the second capacitor comprises a second main-electrode and a second sub-electrode, wherein the first sub-electrode is electrically connected with the second sub-electrode.

5. The free form touch device according to claim 4, further comprising:

a plurality of active devices, located on the substrate; and

a plurality of pixel electrodes, located on the substrate, and electrically connected with the active devices, respectively, wherein at least one pixel electrode of a first group of the pixel electrodes overlaps with the first touch electrode, at least one pixel electrode of a second group of the pixel electrodes overlaps with the second touch electrode, wherein the first touch electrode, the second touch electrode, the first sub-electrode and the second sub-electrode are formed by patterning one same film layer, and the pixel electrodes, the first main-electrode and the second main-electrode are formed by patterning another same film layer.

6. The free form touch device according to claim 5, wherein the first group of the pixel electrodes overlap with the first touch electrode, the second group of the pixel electrodes overlap with the second touch electrode, and any one of the first group of the pixel electrodes does not belong to the second group of the pixel electrodes.

7. The free form touch device according to claim 4, further comprising:

a plurality of active devices, located on the substrate; and

a plurality of organic light-emitting diodes, electrically connected with the active devices, respectively, wherein at least one organic light-emitting diode of a first group of the organic light-emitting diodes is electrically connected with the first touch electrode, and at least one organic light-emitting diode of a second group of the organic light-emitting diodes is electrically connected with the second touch electrode.

8. The free form touch device according to claim 7, wherein the first group of the organic light-emitting diodes are electrically connected with the first touch electrode, the second group of the organic light-emitting diodes are electrically connected with the second touch electrode, and any one of the first group of the organic light-emitting diodes does not belong to the second group of the organic light-emitting diodes.

9. The free form touch device according to claim 4, further comprising:

a carrier;

a plurality of active devices, located on the carrier; and

a plurality of pixel electrodes, located on the carrier, and electrically connected with the active devices, respectively, wherein at least one pixel electrode of a first group of the pixel electrodes overlaps with the first touch electrode, and at least one pixel electrode of a second group of the pixel electrodes overlaps with the second touch electrode; and

a liquid crystal layer, located between the substrate and the carrier.

10. The free form touch device according to claim 9, wherein the first group of the pixel electrodes overlap with the first touch electrode, the second group of the pixel electrodes overlap with the second touch electrode, and any one of the first group of the pixel electrodes does not belong to the second group of the pixel electrodes.

11. A free form touch device, comprising:

a substrate;

a first switching device;

a first touch electrode, located on the substrate, and electrically connected with the first switching device, wherein an area of the first touch electrode is A1;

a first capacitor, electrically connected between the first switching device and the first touch electrode;

a second switching device;

a second touch electrode, located on the substrate, and electrically connected with the second switching device, wherein an area of the second touch electrode is A2, and A1>

A2; and

a second capacitor, electrically connected between the second switching device and the second touch electrode, wherein a capacitance of the first capacitor is less than a capacitance of the second capacitor.

12. The free form touch device according to claim 11, wherein the first capacitor comprises a first main-electrode and a first sub-electrode, and the second capacitor comprises a second main-electrode and a second sub-electrode, wherein the first sub-electrode is electrically connected with the second sub-electrode.

13. The free form touch device according to claim 12, further comprising:

a third switching device;

a third touch electrode, located on the substrate, and electrically connected with the third switching device, wherein an area of the third touch electrode is A3, and A2>

A3; and

a third capacitor, electrically connected between the third switching device and the third touch electrode, wherein a capacitance of the second capacitor is less than a capacitance of the third capacitor.

14. The free form touch device according to claim 12, further comprising:

a plurality of active devices, located on the substrate; and

a plurality of pixel electrodes, located on the substrate, and electrically connected with the active devices, respectively, wherein at least one pixel electrode of a first group of the pixel electrodes overlaps with the first touch electrode, at least one pixel electrode of a second group of the pixel electrodes overlaps with the second touch electrode, and any one of the first group of the pixel electrodes does not belong to the second group of the pixel electrodes, wherein the first touch electrode, the second touch electrode, the first main-electrode and the second main-electrode are formed by patterning one same film layer, and the pixel electrodes, the first sub-electrode and the second sub-electrode are formed by patterning another same film layer.

15. The free form touch device according to claim 12, further comprising:

a plurality of active devices, located on the substrate; and

a plurality of organic light-emitting diodes, electrically connected with the active devices, respectively, wherein at least one organic light-emitting diode of a first group of the organic light-emitting diodes is electrically connected with the first touch electrode, at least one organic light-emitting diode of a second group of the organic light-emitting diodes is electrically connected with the second touch electrode, and any one of the first group of the organic light-emitting diodes does not belong to the second group of the organic light-emitting diodes.

16. The free form touch device according to claim 12, further comprising:

a carrier;

a plurality of active devices, located on the carrier; and

a plurality of pixel electrodes, located on the carrier, and electrically connected with the active devices, respectively, wherein at least one pixel electrode of a first group of the pixel electrodes overlaps with the first touch electrode, at least one pixel electrode of a second group of the pixel electrodes overlaps with the second touch electrode, and any one of the first group of the pixel electrodes does not belong to the second group of the pixel electrodes; and

a liquid crystal layer, located between the substrate and the carrier.

17. The free form touch device according to claim 12, wherein the substrate is a free form substrate.