FORCE TOUCH STRUCTURE AND DISPLAY DEVICE

• US 20190064988A1
• Filed: 05/17/2018
• Published: 02/28/2019
• Est. Priority Date: 08/28/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: ZHENG, Meizhu
• Granted Patent: US 10,795,484 B2
• Time in Patent Office: 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 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 3/044 by capacitive means
• CPC Class Codes: H01L 33/64 Heat extraction or cooling elements
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence

Abstract

The present disclosure provides a force touch structure and a display device. The force touch structure includes a force sensor and a reference layer. A capacitor is formed between the force sensor and the reference layer, the force sensor includes a first pattern layer and a second pattern layer, and the second pattern layer includes a heat dissipation structure.

Claims

1. A force touch structure, comprising a force sensor and a reference layer, wherein a capacitor is formed between the force sensor and the reference layer, the force sensor comprises a first pattern layer and a second pattern layer, and the second pattern layer comprises a heat dissipation structure.

2. The force touch structure according to claim 1, wherein the force sensor further comprises a base film, the first pattern layer is arranged at one side of the base film, and the second pattern layer is arranged at the other side of the base film.

3. The force touch structure according to claim 1, further comprising a spacer layer arranged between the force sensor and the reference layer, wherein the second pattern layer is arranged at a side of the spacer layer away from the reference layer.

4. The force touch structure according to claim 1, wherein the second pattern layer further comprises a pattern structure, the force touch structure overlaps with a whole display panel, the display panel comprises a display region and a peripheral region surrounding the display region, the heat dissipation structure of the second pattern layer overlaps with the display region, and the pattern structure of the second pattern layer overlaps with the peripheral region.

5. The force touch structure according to claim 1, wherein the heat dissipation structure is of a plane-like structure.

6. The force touch structure according to claim 1, wherein each of the heat dissipation structure and the second pattern layer is made of copper.

7. The force touch structure according to claim 1, wherein the reference layer is grounded.

8. The force touch structure according to claim 7, wherein the heat dissipation structure has a thickness ranging from 12 μ

m to 15 μ

m.

9. The force touch structure according to claim 1, wherein the force sensor further comprises a first protection layer arranged at a side of the first pattern layer away from the second pattern layer.

10. The force touch structure according to claim 9, wherein the first protection layer is a halogen-free polyimide membrane.

11. The force touch structure according to claim 4, wherein the force sensor is a flexible printed circuit, the first pattern layer comprises a circuit structure, the pattern structure of the second pattern layer is a circuit structure comprising a force touch line at a position corresponding to the peripheral region of the display panel.

12. The force touch structure according to claim 1, wherein the force sensor further comprises a protection structure arranged at a side of the second pattern layer away from the first pattern layer and merely covering the pattern structure of the second pattern layer rather than the heat dissipation structure.

13. A display device, comprising a display panel and a force touch structure, wherein the force touch structure is arranged at a back surface of the display panel, and the back surface is arranged opposite to a light-emitting surface of the display panel, wherein the force touch structure comprises a force sensor and a reference layer, a capacitor is formed between the force sensor and the reference layer, the force sensor comprises a first pattern layer and a second pattern layer, and the second pattern layer comprises a heat dissipation structure.

14. The display device according to claim 13, wherein the force sensor further comprises a base film, the first pattern layer is arranged at one side of the base film, and the second pattern layer is arranged at the other side of the base film, wherein the force touch structure further comprises a spacer layer arranged between the force sensor and the reference layer, and wherein the second pattern layer is arranged at a side of the spacer layer away from the reference layer.

15. The display device according to claim 13, wherein the second pattern layer further comprises a pattern structure, the force touch structure overlaps with a whole display panel, the display panel comprises a display region and a peripheral region surrounding the display region, the heat dissipation structure of the second pattern layer overlaps with the display region, and the pattern structure of the second pattern layer overlaps with the peripheral region.

16. The display device according to claim 13, wherein each of the heat dissipation structure and the second pattern layer is made of copper.

17. The display device according to claim 15, wherein the force sensor is a flexible printed circuit, the first pattern layer comprises a circuit structure, the pattern structure of the second pattern layer is a circuit structure comprising a force touch line at a position corresponding to the peripheral region of the display panel.

18. The display device according to claim 13, wherein the second pattern layer is arranged at a side of the first pattern layer away from the display panel.

19. The display device according to claim 13, further comprising a membrane made of silicon nitride and arranged between the display panel and the force sensor.

20. The display device according to claim 13, further comprising a second protection layer arranged at a side of a touch structure away from the display panel.