PRESSURE SENSING INPUT EQUIPMENT

• US 20170010703A1
• Filed: 07/10/2016
• Published: 01/12/2017
• Est. Priority Date: 06/10/2015
• Status: Active Grant

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: He, Jiayou, Chen, Feng, Ye, Kunxiong
• Granted Patent: US 10,401,990 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• 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 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H05K 1/0296 Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295 H05K1/11 takes precedence; lay-out adapted to mounted component configuration H05K1/18

Abstract

A pressure sensing input equipment includes a substrate, a first surface and a second surface, an electrode layer, and a pressure sensing chip. The first surface and the second surface are disposed oppositely. The first surface includes a pressure sensing region and a non-pressure sensing region, in which the area of the non-pressure sensing region is complementary to the area of the pressure sensing region. The electrode layer includes a plurality of pressure sensing electrodes disposed in the pressure sensing region to detect pressure magnitude. The pressure sensing electrodes include a first end part and a second end part The pressure sensing chip is electrically connected to the pressure sensing electrodes, and the pressure sensing chip determines pressure magnitude by detecting the resistance variation after the pressure sensing electrode was pressured. Such design can achieve double functions that detect touch position and pressure magnitude of the pressure sensing input equipment.

Claims

1. A pressure sensing input equipment, comprising:

a substrate, comprising a first surface and a second surface, wherein the first surface and the second surface are disposed oppositely, the first surface comprises a pressure sensing region and

a non-pressure sensing region, and an area of the first surface is complementary to another area of the second surface;

an electrode layer, comprising a plurality of pressure sensing electrodes disposed in the pressure sensing region to detect pressure magnitude, wherein the pressure sensing electrodes comprise a first end part and a second end part opposite to the first end part; and

a pressure sensing chip, electrically connected to the pressure sensing electrodes, wherein after the pressure sensing input equipment receives pressure, the pressure sensing chip detects the induced resistance variation of the pressure sensing electrodes to achieve pressure magnitude detection.

2. The pressure sensing input equipment of claim 1, further comprising:

a plurality of first wires, connected to the first end part of the pressure sensing electrodes;

a plurality of second wires, connected to the second end part of the pressure sensing electrodes; and

a flexible printed circuit, connected to the first wires and the second wires, wherein the pressure sensing chip is connected to the pressure sensing electrodes through the flexible printed circuit.

3. The pressure sensing input equipment of claim 1, wherein the pressure sensing electrodes are arranged in radial shape or tortuous path in the pressure sensing region.

4. The pressure sensing input equipment of claim 1, wherein an area of the pressure sensing region is smaller than that of the non-pressure sensing region

5. The pressure sensing input equipment of claim 1, wherein the pressure sensing chip comprises a Wheatstone bridge circuit, after the pressure sensing input, equipment receives pressure, the Wheatstone bridge circuit detects the induced resistance variation of the pressure sensing electrodes.

6. The pressure sensing input equipment of claim 1, wherein the substrate is a cover board, and the second surface of the substrate is an operation surface.

7. The pressure sensing input equipment of claim 1, further comprising a cover board, wherein the cover board comprises a first surface and an element installation surface opposite to the first surface, the first surface is an operation surface, and the element installation surface is present over the substrate.

8. The pressure sensing input equipment of claim 1, wherein a plurality of first touch sensing electrodes and a plurality of second touch sensing electrodes are disposed in the non-pressure sensing region for detecting the multipoint touch positions, wherein the first touch sensing electrodes and the second touch sensing electrodes are interleaved but non-cross.

9. The pressure sensing input equipment of claim 8, wherein the pressure sensing electrodes are disposed in a gap between the first touch sensing electrodes and the second touch sensing electrodes, wherein the first touch sensing electrodes, the second touch sensing electrodes, and the pressure sensing electrodes are electrically insulated from each other.

10. The pressure sensing input equipment of claim 9, wherein a wire width of the pressure sensing electrodes is 0.5 to 0.8 times a wire width of the corresponding first touch sensing electrodes and a wire width of the corresponding second touch sensing electrodes, and the wire width of the pressure sensing electrodes ranges from 5 μ

m to 300 μ

m.

11. The pressure sensing input equipment of claim 8, wherein the first touch sensing electrodes are triangle and comprise a first touch sensing electrodes hypotenuse part, the second touch sensing electrodes are triangle and comprise a second touch sensing electrodes hypotenuse part, the first touch sensing electrodes and the second touch sensing electrodes are disposed in interleaved, and the pressure sensing electrodes are tortuous path and are disposed in a space of the interleaved structure formed by the first touch sensing electrodes and the second touch sensing electrodes.

12. The pressure sensing input equipment of claim 8, wherein the first touch sensing electrodes are radially disposed in a radial interspace of the second touch sensing electrodes, and the first touch sensing electrodes comprise a plurality of first touch sensing electrode projection parts and a plurality of first touch sensing electrode spheres in the middle.

13. The pressure sensing input equipment of claim 12, wherein the first touch sensing electrode spheres are set as a center, and the first touch sensing electrode projection parts are radially arranged and uniformly spaced from each other with respect to the center.

14. The pressure sensing input equipment of claim 12, wherein a plurality of second sensing electrode recesses are formed in the second sensing electrodes, the pressure sensing electrodes are arranged in radial shape, and the pressure sensing electrodes are disposed in an interspace of an interleaved structure formed by the first touch sensing electrode projection parts and the second sensing electrodes recesses.