Touch panel

Patent metadata

Field	Value
Publication number	US-12307041-B2
Application number	US-202218246611-A
Country	US
Kind code	B2
Filing date	Apr 27, 2022
Priority date	Apr 27, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A touch panel, the touch panel includes a control substrate, a touch layer and a piezoelectric layer that are stacked; the control substrate includes a first substrate and a control circuit layer arranged on the first substrate, and the touch layer and the piezoelectric layer are located on the control substrate, the control circuit layer comprises a control circuit, and the control circuit is electrically connected with the touch layer and the piezo electric layer respectively, and is configured to apply electrical signals to the touch layer and the piezoelectric layer and/or receive electrical signals from the touch layer and the piezoelectric layer respectively. The touch panel can realize the global tactile feedback function, and has a simple structure and has the advantages of thinner, lighter, lower driving voltage, and lower power consumption.

First claim

What is claimed is:

1. A touch panel, comprising a control substrate, a touch layer and a piezoelectric layer that are stacked,
wherein the control substrate comprises a first substrate and a control circuit layer arranged on the first substrate, and the touch layer and the piezoelectric layer are located on the control substrate,
the control circuit layer comprises a control circuit, and the control circuit is electrically connected with the touch layer and the piezoelectric layer respectively, and is configured to apply electrical signals to the touch layer and the piezoelectric layer and/or receive electrical signals from the touch layer and the piezoelectric layer respectively,
wherein the touch panel further comprises a second substrate, wherein the touch layer and the piezoelectric layer are arranged on the second substrate, and
the second substrate, the touch layer and the piezoelectric layer are arranged as a whole on a side of the control circuit layer away from the first substrate,
wherein the touch layer and the piezoelectric layer are respectively arranged on a same side of the second substrate, and
the touch panel further comprises an electromagnetic shielding layer arranged between the touch layer and the piezoelectric layer,
wherein the touch layer is arranged on a side of the piezoelectric layer away from the control substrate,
the touch panel further comprises a cover plate on a surface of the touch layer away from the control substrate, and a surface of the cover plate away from the control substrate becomes a touch surface of the touch panel,
wherein the electromagnetic shielding layer is grounded or be applied with a fixed low-level voltage, and the touch panel further includes an interval insulating layer arranged between the electromagnetic shielding layer and the piezoelectric layer.

2. The touch panel according to claim 1 , further comprising at least one spacer arranged between the second substrate and the control substrate, to space the second substrate and the control substrate.

3. The touch panel according to claim 2 , wherein the at least one spacer comprises a plurality of spacers, and the plurality of spacers are arranged at intervals on edges of the second substrate and the control substrate,
wherein a planar shape of the second substrate and a plane shape of the control substrate are rectangles, and
each of the plurality of spacers is shaped in a straight line and the plurality of spacers are disposed along at least two sides of the rectangle respectively.

4. The touch panel according to claim 3 , wherein the plurality of spacers comprise four spacers, each of the four spacers has a shape of a straight line, and the four spacers are disposed at middle positions of four sides of the rectangle respectively.

5. The touch panel according to claim 3 , wherein the plurality of spacers comprise four spacers, and the rectangle comprises two opposite long sides and two opposite short sides, and
each of the four spacers has a shape of a straight line, and the four spacers are arranged along the two long sides of the rectangle, and two spacers are correspondingly arranged on each of the two long sides.

6. The touch panel according to claim 5 , wherein a length of each of the long sides is L, and each of the long sides has a first end point and a second end point, and
a distance between the first end point and a central axis of one of the two spacers close to the first end point perpendicular to each of the long sides is from ¼L to ⅓L, and a distance between the second end point and a central axis of one of the two spacers close to the second end point perpendicular to each of the long sides is from ¼L to ⅓L,
wherein a length of the long side of the rectangle is L, and a length of the short side is W,
a length of each spacer in the plurality of spacers is from 0.1 L to 0.5 L, and a width of each spacer in the plurality of spacers is from 0.01 W to 0.10 W.

7. The touch panel according to claim 3 , wherein planar shapes of the second substrate and the control substrate are rectangles, and
the plurality of spacers comprise four spacers, and each of the four spacers is shaped in an L shape and are disposed along four corners of the rectangle.

8. The touch panel according to claim 2 , wherein in a direction perpendicular to the second substrate, a height of the at least one spacer is from 0.5 mm to 10 mm,
wherein Young's modulus of material of the at least one spacer is from 0.1 MPa to 2.0 MPa.

9. The touch panel according to claim 2 , further comprising at least one pressure sensor sensitive element arranged between the second substrate and the control substrate, wherein the at least one pressure sensor sensitive element is electrically connected with the control circuit, and
in a direction perpendicular to the second substrate, a height of the at least one pressure sensor sensitive element is lower than a height of the at least one spacer,
wherein the at least one pressure sensor sensitive element and the at least one spacer are both arranged on the control substrate, and
the at least one pressure sensor sensitive element is separated from the second substrate.

10. The touch panel according to claim 1 , wherein the piezoelectric layer comprises a first control electrode layer, a second control electrode layer, and a piezoelectric material layer between the first control electrode layer and the second control electrode layer,
wherein the first control electrode layer comprises a plurality of first pressure sensing electrodes arranged at intervals, at least one of the plurality of first pressure sensing electrodes is configured to transmit a pressure sensing signal to the control circuit in a case that the piezoelectric material layer is under pressure,
wherein the first control electrode layer further comprises a plurality of first vibration feedback electrodes arranged at intervals,
the control circuit is configured to apply an electrical signal to at least one of the plurality of first vibratory feedback electrodes in a case that the pressure sensing signal is greater than a threshold, to drive the piezoelectric material layer to vibrate.

11. The touch panel according to claim 10 , wherein the plurality of first pressure sensing electrodes and the plurality of first vibration feedback electrodes are strip-shaped electrodes, and the strip-shaped electrodes extend along a first direction and are arranged at intervals in a second direction which is perpendicular to the first direction,
wherein a width of each of the plurality of first vibration feedback electrodes in the second direction is greater than a width of each of the plurality of first pressure sensing electrodes in the second direction.

12. The touch panel according to claim 11 , wherein the plurality of first pressure sensing electrodes and the plurality of first vibration feedback electrodes are arranged alternately in the second direction.

13. The touch panel according to claim 11 , wherein each of the plurality of first pressure sensing electrodes comprises a plurality of sub-strip electrodes spaced along the first direction; and
each of the plurality of first vibration feedback electrodes comprises a plurality of sub-strip electrodes spaced along the first direction.

14. The touch panel according to claim 10 , wherein the plurality of first pressure sensing electrodes and the plurality of first vibration feedback electrodes are block-shaped electrodes,
the plurality of first pressure sensing electrodes are spaced along the first direction and are arranged in a column, the plurality of first vibration feedback electrodes are sp

Assignees

• Beijing Boe Technology Dev Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Hua Hui
• Chen Yuju
• Wang Yingzi

Classifications

• G06F3/016

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• G06F3/04146

  using pressure sensitive conductive elements delivering a boolean signal and located between crossing sensing lines, e.g. located between X and Y sensing line layers · CPC title

• G06F3/0448

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title