Tactile feedback module, method for making same, and touch device

• US 10,642,363 B1
• Filed: 03/29/2019
• Issued: 05/05/2020
• Est. Priority Date: 01/11/2019
• Status: Active Grant

• Current Assignee: Interface Optoelectronics (ShenZhen) Co., Ltd. (Cloud Software Group), General Interface Solution Limited (General Interface Solution (GIS) Holding Ltd.), Interface Technology (Chengdu) Co., Ltd.
• Original Assignee: Interface Technology (Chengdu) Co., Ltd.
• Inventors: Tu, Yu-Chieh, Wu, Yi-Ting
• Primary Examiner(s): Patel, Premal R
• Application Number:
  US16/369,065
• Time in Patent Office: 403 Days
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: H10N 30/00 Piezoelectric or electrostrictive devices integrated devices or assemblies of multiple devices H10N39/00
• CPC Class Codes: H10N 30/072 by laminating or bonding of piezoelectric or electrostrictive bodies
• CPC Class Codes: H10N 30/87 Electrodes or interconnections, e.g. leads or terminals
• CPC Class Codes: H10N 30/877 Conductive materials

Abstract

A tactile feedback module not subject to a failure in function because of high-voltage arcing includes a circuit board and a piezoelectric unit. The circuit board includes spaced first connecting pad and second connecting pad. The piezoelectric unit includes a piezoelectric layer, a first electrode, and a second electrode. The piezoelectric layer is adjacent to the circuit board, and the first electrode and the second electrode are insulated from each other. A first voltage is applied to the first electrode and a second voltage different from the first voltage is applied to the second electrode, the piezoelectric layer generates a tactile feedback based on a voltage difference between the voltages. The disclosure also provides a method for making the tactile feedback module and a touch device.

Claims

1. A tactile feedback module, comprising:

a circuit board, the circuit board comprising a first connecting pad and a second connecting pad spaced from the first connecting pad;

a first isotropic conductive adhesive layer on the first connecting pad;

a second isotropic conductive adhesive layer on the second connecting pad; and

a piezoelectric unit, the piezoelectric unit comprising;

a piezoelectric layer having a first surface being adjacent to the circuit board, a second surface opposite to the first surface and a side surface connecting the first surface and the second surface;

a first electrode extending from the second surface of the piezoelectric layer along the side surface of the piezoelectric layer to the first surface of the piezoelectric layer, and electrically connected to the first connecting pad by the first isotropic conductive adhesive layer; and

a second electrode, at least on the first surface of the piezoelectric layer and insulated and spaced apart from the first electrode, and the second electrode electrically connected to the second connecting pad by the second isotropic conductive adhesive layer;

wherein a first voltage is applied to the first electrode by the circuit board and a second voltage different from the first voltage is applied to the second electrode by the circuit board, and the piezoelectric layer generates a tactile feedback based on a voltage difference between the first voltage and the second voltage.

2. The tactile feedback module according to claim 1, further comprising an insulating adhesive layer, wherein the insulating adhesive layer completely fills an gap between the first connecting pad and the second connecting pad, an gap between the first isotropic conductive paste layer and the second isotropic conductive paste layer and an gap between the first electrode and the second electrode.

3. The tactile feedback module according to claim 2, wherein both the first isotropic conductive adhesive layer and the second isotropic conductive adhesive layer comprise rod-type first conductive particles.

4. The tactile feedback module according to claim 3, wherein both the first isotropic conductive adhesive layer and the second isotropic conductive adhesive layer further comprise sphere-type second conductive particles.

5. The tactile feedback module according to claim 1, wherein the first electrode extends on the first surface of the piezoelectric layer and beyond the first isotropic conductive adhesive layer.

6. The tactile feedback module according to claim 1, wherein the second electrode extends from the first surface of the piezoelectric layer along the side surface of the piezoelectric layer to the second surface of the piezoelectric layer.

7. A touch device, comprising:

a cover defining a touch surface for inputting touch operations, and a plurality of tactile feedback modules on a side of the cover away from the touch surface, and each of the plurality of tactile feedback modules comprising;

a circuit board, the circuit board comprising a first connecting pad and a second connecting pad spaced from the first connecting pad;

a first isotropic conductive adhesive layer on the first connecting pad;

a second isotropic conductive adhesive layer on the second connecting pad; and

a piezoelectric unit, the piezoelectric unit comprising;

a piezoelectric layer having a first surface being adjacent to the circuit board, a second surface opposite to the first surface and a side surface connecting the first surface and the second surface;

a first electrode extending from the second surface of the piezoelectric layer along the side surface of the piezoelectric layer to the first surface of the piezoelectric layer, and electrically connected to the first connecting pad by the first isotropic conductive adhesive layer; and

a second electrode, at least on the first surface of the piezoelectric layer, and insulated and spaced apart from the first electrode, and the second electrode electrically connected to the second connecting pad by the second isotropic conductive adhesive layer;

wherein a first voltage is applied to the first electrode by the circuit board and a second voltage different from the first voltage is applied to the second electrode by the circuit board, and the piezoelectric layer generates a tactile feedback based on a voltage difference between the first voltage and the second voltage.

8. The touch device according to claim 7, further comprising an insulating adhesive layer, wherein the insulating adhesive layer completely fills an gap between the first connecting pad and the second connecting pad, an gap between the first isotropic conductive paste layer and the second isotropic conductive paste layer and an gap between the first electrode and the second electrode.

9. The touch device according to claim 8, wherein both the first isotropic conductive adhesive layer and the second isotropic conductive adhesive layer comprise rod-type first conductive particles.

10. The touch device according to claim 9, wherein both the first isotropic conductive adhesive layer and the second isotropic conductive adhesive layer further comprise sphere-type second conductive particles.

11. The touch device according to claim 7, wherein the first electrode extends on the first surface of the piezoelectric layer and beyond the first isotropic conductive adhesive layer.

12. The touch device according to claim 7, wherein the second electrode extends from the first surface of the piezoelectric layer along the side surface of the piezoelectric layer to the second surface of the piezoelectric layer.

13. A method for making a tactile feedback module, comprising:

Block S1;

providing a circuit board, wherein the circuit board comprises a first connecting pad and a second connecting pad spaced apart from the first connecting pad, and an uncured film-type isotropic conductive adhesive is formed on the first connecting pad and the second connecting pad;

Block S2;

providing a piezoelectric unit and laminating the piezoelectric unit to the circuit board, wherein the piezoelectric unit comprises a piezoelectric layer, a first electrode and a second electrode, the piezoelectric layer has a first surface, a second surface opposite to the first surface and a side surface connecting the first surface and the second surface, the first electrode extends from the second surface of the piezoelectric layer along the side surface of the piezoelectric layer to the first surface of the piezoelectric layer, and the second electrode is at least on the first surface of the piezoelectric layer and spaced apart from the first electrode;

Block S3;

curing the film-type isotropic conductive adhesive to form a first isotropic conductive adhesive layer and a second isotropic conductive adhesive layer, wherein the first electrode is electrically connected to the first connecting pad by the first isotropic conductive adhesive layer, and the second electrode is electrically connected to the second connecting pad by the second isotropic conductive adhesive layer.

14. The method according to claim 13, before the uncured film-type isotropic conductive adhesive is formed on the first connecting pad and the second connecting pad, wherein in the Block S1, an uncured film-type non-conductive adhesive is formed between the first connecting pad and the second connecting pad.

15. The method according to claim 14, wherein in the Block S3, when the film-type isotropic conductive adhesive is cured, the film-type non-conductive adhesive is cured at the same time.