Dual-mode capacitive touch display panel

• US 10,712,864 B2
• Filed: 07/30/2019
• Issued: 07/14/2020
• Est. Priority Date: 04/28/2016
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lai, Shih-Lun, Hsieh, Yi-San, Huang, I-Hsiung
• Primary Examiner(s): Jansen, II, Michael J
• Application Number:
  US16/526,590
• Publication Number:
  US 20190354228A1
• Time in Patent Office: 350 Days
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A dual-mode capacitive touch display panel includes first and second substrates, a display layer disposed between the first and second substrates, at least two first touch electrodes, at least two second touch electrodes, plural pressure sensing electrodes, and a shielding conductive layer. The first and second touch electrodes are disposed on the first substrate and overlap sub-pixels thereon. The first and second touch electrodes are respectively separated. The pressure sensing electrodes are disposed on the second substrate, and overlap the corresponding first or second touch electrodes in a vertical projection direction. The shielding conductive layer is disposed on the second substrate and includes plural openings, the pressure sensing electrodes overlap the corresponding openings, and the pressure sensing electrodes have a lower surface resistance than the shielding conductive layer does.

Claims

1. A dual-mode capacitive touch display panel, comprising:

a plurality of touch electrodes on a first substrate;

a plurality of pressure sensing electrodes on a second substrate;

a control circuit, controlling electric potential on said plurality of pressure sensing electrodes;

a shielding conductive layer, including a plurality of first openings, wherein each of said plurality of first openings corresponds and aligns to one of said plurality of pressure sensing electrodes;

wherein both said plurality of pressure sensing electrodes and said shielding conductive layer are floating under a touch mode operation, and both said plurality of pressure sensing electrodes and said shielding conductive layer have a first potential under a force sensing mode operation.

2. The dual-mode capacitive touch display panel according to claim 1, further comprising:

an insulating layer for separating said control circuit and said shielding conductive layer.

3. The dual-mode capacitive touch display panel according to claim 2, wherein said insulating layer includes a plurality of second openings, and each of said plurality of second openings corresponds and aligns to one of said plurality of first openings.

4. The dual-mode capacitive touch display panel according to claim 3, wherein said each of said plurality of pressure sensing electrodes positions within one of said plurality of first openings, and said control circuit connects to said plurality of force sensing electrodes via said plurality of second openings.

5. The dual-mode capacitive touch display panel according to claim 2, wherein both said control circuit and said plurality of force sensing electrodes are positioned on said first separating layer.

6. The dual-mode capacitive touch display panel according to claim 2, wherein said each of said plurality of pressure sensing electrodes positions within one of said plurality of first openings.

7. The dual-mode capacitive touch display panel according to claim 2, where said insulating layer is selected from one of a first insulating layer and a substrate.

8. The dual-mode capacitive touch display panel according to claim 7, further comprising:

a second insulation layer;

wherein said control circuit is positioned on said first separating layer, said plurality of force sensing electrodes are positioned on said second insulation layer, and said control circuit is sandwiched between said shielding conductive layer and said plurality of force sensing electrodes.

9. The dual-mode capacitive touch display panel according to claim 1, wherein each of said plurality of force sensing electrodes aligns to one of the said plurality of touch electrodes.

10. The dual-mode capacitive touch display panel according to claim 1, wherein each of said plurality of force sensing electrodes aligns to a center space between two adjacent touch electrodes.

11. The dual-mode capacitive touch display panel according to claim 1, wherein each of said plurality of force sensing electrodes aligns to a center space among four adjacent touch electrodes.