Sensing apparatus for touch and force sensing

• US 10,289,241 B2
• Filed: 06/01/2017
• Issued: 05/14/2019
• Est. Priority Date: 06/17/2016
• Status: Active Grant

• Current Assignee: Superc-Touch Corporation
• Original Assignee: Superc-Touch Corporation
• Inventors: Lee, Hsiang-Yu, Chin, Shang, Lin, Ping-Tsun
• Primary Examiner(s): Shen, Yuzhen
• Application Number:
  US15/611,778
• Publication Number:
  US 20170364199A1
• Time in Patent Office: 712 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 2203/04112 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 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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

Abstract

A sensing apparatus for touch and force sensing includes from, top to bottom, a protection layer, a touch electrode layer, a force electrode layer, and a resilient dielectric layer, and further includes a capacitance sensing module. In touch sensing operation, the capacitance sensing module sequentially or randomly applies a touch driving signal to selected ones of the second touch electrodes, and sequentially or randomly receives a touch sensing signal from selected ones of the first touch electrodes. In force sensing operation, the capacitance sensing module sequentially or randomly applies a force capacitance-exciting signal to the at least one force sensing electrode and obtains a force sensing signal from the force sensing electrode.

Claims

1. A touch and force sensing apparatus comprising:

a touch electrode layer comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along second direction, wherein the first direction is substantially perpendicular to the second direction;

a protection layer arranged on a side of the touch electrode layer;

a force electrode layer arranged on a side of the touch electrode layer, the side being opposite to the protection layer, the force electrode layer comprising at least one force sensing electrode;

a resilient dielectric layer, arranged on a side of the force electrode layer, the side being opposite to the touch electrode layer; and

a capacitance sensing module sequentially or randomly applying a touch driving signal to selected ones of the second touch electrodes, and sequentially or randomly receiving a touch sensing signal from selected ones of the first touch electrodes in a touch sensing operation;

the capacitance sensing module sequentially or randomly applying a force capacitance-exciting signal to the at least one force sensing electrode, and receiving a force sensing signal from the force sensing electrode in a force sensing operation;

wherein the touch driving signal is applied to the selected ones of the second touch electrodes at a first time, the touch sensing signal is received from selected ones of the first touch electrodes at the first time, the force capacitance-exciting signal is applied to the at least one force sensing electrode at the second time, the first time is different with the second time; and

wherein the capacitance sensing module applies an interlayer capacitance eliminating signal, with phase same as that of the force capacitance-exciting signal, to the first touch electrodes and the second touch electrodes in force sensing operation, wherein the interlayer capacitance eliminating signal is different with the touch driving signal and the force capacitance-exciting signal.

2. The touch and force sensing apparatus of claim 1, wherein the protection layer is a glass substrate, a polymer thin film substrate, or a cured coating layer.

3. The touch and force sensing apparatus of claim 1, wherein the capacitance sensing module applies a reference voltage to the at least one force sensing electrode in the touch sensing operation.

4. The touch and force sensing apparatus of claim 1, wherein the capacitance sensing module comprises a mutual-capacitance sensing circuit and a self-capacitance sensing circuit, the capacitance sensing module senses a position of a touch point with the mutual-capacitance sensing circuit in the touch sensing operation, and senses a self-capacitance change of the force sensing electrode with the self-capacitance sensing circuit in the force sensing operation.

5. The touch and force sensing apparatus of claim 1, wherein the resilient dielectric layer includes a resilient gelatinous material, the resilient gelatinous material is compressively deformed under pressure, and restores to original shape and volume if pressure is not present.

6. The touch and force sensing apparatus of claim 1, wherein the force capacitance-exciting signal is an alternating signal or a current source.

7. The touch and force sensing apparatus of claim 1, further comprising a reference force electrode layer arranged on a side of the resilient dielectric layer, the side being opposite to the force electrode layer, the reference force electrode layer comprising at least one reference force electrode.

8. The touch and force sensing apparatus of claim 7, wherein the capacitance sensing module further applies a counter-exciting signal to the reference force electrode layer in the force sensing operation.

9. The touch and force sensing apparatus of claim 8, wherein the counter-exciting signal is an alternating signal with phase opposite to that of the force capacitance-exciting signal.

10. The touch and force sensing apparatus of claim 7, wherein the capacitance sensing module further applies a reference voltage to the reference force electrode layer in the force sensing operation.

11. The touch and force sensing apparatus of claim 10, wherein the reference voltage is a zero voltage signal.

12. The touch and force sensing apparatus of claim 7, wherein the reference force electrode layer is a static shielding protection layer of a display panel.

13. The touch and force sensing apparatus of claim 7, wherein the reference force electrode layer is a polarizer layer of a display panel, the polarizer layer is made of conductive material.

14. A touch and force sensing apparatus comprising:

a touch electrode layer comprising a plurality of touch sensing electrodes;

a protection layer arranged on a side of the touch electrode layer;

a force electrode layer arranged on a side of the touch electrode layer, the side being opposite to the protection layer, the force electrode layer comprising at least one force sensing electrode;

a resilient dielectric layer, arranged on a side of the force electrode layer, the side being opposite to the touch electrode layer; and

a capacitance sensing module sequentially or randomly applying a touch capacitance-exciting signal to the at least one touch sensing electrode, and sequentially or randomly receiving a touch sensing signal from the touch sensing electrode for touch sensing;

the capacitance sensing module applying a force capacitance-exciting signal to the at least one force sensing electrode, and receiving a force sensing signal from the force sensing electrode for force sensing;

wherein the capacitance sensing module applies an interlayer capacitance eliminating signal, with phase same as that of the force capacitance-exciting signal, to the touch sensing electrodes in force sensing operation, wherein the interlayer capacitance eliminating signal is different with the touch driving signal and the force capacitance-exciting signal.

15. The touch and force sensing apparatus of claim 14, wherein the protection layer is a glass substrate, a polymer thin film substrate, or a cured coating layer.

16. The touch and force sensing apparatus of claim 14, wherein the interlayer capacitance eliminating signal is a signal with same phase and same voltage as that of the force capacitance-exciting signal.

17. The touch and force sensing apparatus of claim 14, wherein the capacitance sensing module applies an auxiliary signal with phase same as that of the touch capacitance-exciting signal to the at least one force sensing electrode in the touch sensing operation.

18. The touch and force sensing apparatus of claim 14, wherein the capacitance sensing module comprises at least one self-capacitance sensing circuit.

19. The touch and force sensing apparatus of claim 14, wherein the touch capacitance-exciting signal and the force capacitance-exciting signal are respectively an alternating signal or a current source.

20. The touch and force sensing apparatus of claim 14, further comprising a reference force electrode layer arranged on a side of the resilient dielectric layer, the side being opposite to the force electrode layer, and the reference force electrode layer comprising at least one reference force electrode.

21. The touch and force sensing apparatus of claim 20, wherein the capacitance sensing module further applies a reference voltage or a counter-exciting signal with phase opposite to that of the force capacitance-exciting signal to the reference force electrode layer in the force sensing operation.

22. The touch and force sensing apparatus of claim 20, wherein the reference force electrode layer is a static shielding protection layer of a display panel.

23. The touch and force sensing apparatus of claim 20, wherein the reference force electrode layer is a polarizer layer of a display panel, the polarizer layer is made of conductive material.