Tactile feedback device, display apparatus, and tactile feedback method

Patent metadata

Field	Value
Publication number	US-12411550-B2
Application number	US-202117787404-A
Country	US
Kind code	B2
Filing date	Aug 30, 2021
Priority date	Aug 30, 2021
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The present disclosure provides a tactile feedback device having a sensing area and a feedback area surrounding the sensing area; wherein the tactile feedback device includes: a base substrate, a touch element in the sensing area, a piezoelectric element in the feedback area, and a tactile feedback driving component, on the base substrate; and wherein the tactile feedback driving component is configured to: determine a touch position in response to a touch data acquired by the touch element; determine a corresponding driving signal according to at least a touch area where the touch position is located; and input the driving signal to the piezoelectric element to drive the piezoelectric element to generate a tactile feedback. The present disclosure also provides a display apparatus and a tactile feedback method.

First claim

What is claimed is:

1. A tactile feedback device, having a sensing area and a feedback area surrounding the sensing area, comprising: a base substrate, and a touch element, a piezoelectric element and a tactile feedback driving component on the base substrate, the touch element being in the sensing area, and the piezoelectric element being in the feedback area, wherein
the tactile feedback driving component is configured to:
determine a touch position in response to a touch data acquired by the touch element;
determine a corresponding driving signal according to at least a touch area where the touch position is located; and
input the driving signal to the piezoelectric element to drive the piezoelectric element to generate a tactile feedback, wherein

the piezoelectric element comprises: a first electrode, a piezoelectric film, and a second electrode sequentially stacked along a direction away from the base substrate,
the touch element comprises a plurality of touch electrodes, a plurality of sensing electrodes and an interlayer insulating layer between a layer in which the plurality of touch electrodes are located and a layer in which the plurality of sensing electrodes are located; orthographic projections of the plurality of touch electrodes and the plurality of sensing electrodes on the base substrate intersect with each other; and
a lower surface of the plurality of touch electrodes and an upper surface of the first electrode are at a first vertical level relative to the base substrate, and a lower surface of the plurality of sensing electrodes and an upper surface of the second electrode are at a second vertical level relative to the base substrate, and the first vertical level is different from the second vertical level.

2. The tactile feedback device of claim 1 , wherein
the tactile feedback driving component comprises: a data analysis element, a signal determination element and a signal generation element;
the data analysis element is configured to determine, in response to the touch data acquired by the touch element, a touch action type and the touch position;
the signal determination element is configured to determine the driving signal according to the touch area where the touch position is located and the touch action type; and
the signal generation element is configured to generate and output the driving signal.

3. The tactile feedback device of claim 2 , wherein
the signal determination element is configured to determine that the driving signal is a first high-frequency continuous wave signal in response to the touch area where the touch position is located being an edge area of an object and the touch action type being a slide type.

4. The tactile feedback device of claim 3 , wherein
the signal determination element is configured to determine that the driving signal is a second high-frequency continuous wave signal in response to the touch area where the touch position is located being a stripe area and the touch action type being the slide type, and
the first high-frequency continuous wave signal and the second high-frequency continuous wave signal have different frequencies.

5. The tactile feedback device of claim 4 , wherein
the first high-frequency continuous wave signal and the second high-frequency continuous wave signal are high-frequency continuous wave signals modulated by a sinc function.

6. The tactile feedback device of claim 2 , wherein
the signal determination element is configured to determine that the driving signal is a low-frequency square wave pulse signal in response to the touch area where the touch position is located being an internal area of an object and the touch action type being a press type.

7. The tactile feedback device of claim 2 , wherein
the signal determination element is configured to determine that the driving signal is a second high-frequency continuous wave signal in response to the touch area where the touch position is located being a stripe area and the touch action type being a slide type.

8. The tactile feedback device of claim 1 , wherein
the tactile feedback driving component is configured to load the driving signal between the first electrode and the second electrode of the piezoelectric element to drive the piezoelectric element to generate the tactile feedback.

9. The tactile feedback device of claim 1 , wherein
a distance between the piezoelectric element and the sensing area is greater than or equal to 100 micrometers.

10. The tactile feedback device of claim 1 , wherein
the piezoelectric element comprises a plurality of piezoelectric elements at least on two opposite sides of the sensing area.

11. The tactile feedback device of claim 10 , wherein
the plurality of piezoelectric elements are uniformly distributed around the sensing area.

12. A display apparatus, comprising:
a display substrate and a tactile feedback device on a display side of the display substrate,
wherein the tactile feedback device is the tactile feedback device of claim 1 .

13. The tactile feedback device of claim 1 , wherein
the plurality of touch electrodes extend in a first direction, the plurality of sensing electrodes extend in a second direction intersecting with the first direction, and the piezoelectric element extends in the first direction.

14. The tactile feedback device of claim 1 , wherein
the plurality of touch electrodes extend in a first direction, the plurality of sensing electrodes extend in a second direction intersecting with the first direction, and an extension direction of the piezoelectric element forms an acute angle with both the first direction and the second direction.

15. The tactile feedback device of claim 1 , further comprising a connection layer between the plurality of touch electrodes and the base substrate, and is configured to adhere the touch element with the base substrate.

16. A tactile feedback method applied to a tactile feedback device, wherein the tactile feedback device has a sensing area and a feedback area surrounding the sensing area, wherein the tactile feedback device comprises: a base substrate, and a touch element, a piezoelectric element and a tactile feedback driving component on the base substrate, the touch element being in the sensing area, and the piezoelectric element being in the feedback area; and
wherein the method comprises:
determining a touch position in response to a touch data acquired by the touch element;
determining a corresponding driving signal according to at least a touch area where the touch position is located; and
inputting the driving signal to the piezoelectric element to drive the piezoelectric element to generate a tactile feedback, wherein
the piezoelectric element comprises: a first electrode, a piezoelectric film, and a second electrode sequentially stacked along a direction away from the base substrate,
the touch element comprises a plurality of touch electrodes, a plurality of sensing electrodes and an interlayer insulating layer between a layer in which the plurality of touch electrodes are located and a layer in which the plurality of sensing electrodes are located; orthographic projections of the plurality of touch electrodes and the plurality of sensing electrodes on the base substrate intersect with each other; and
a lower surface of the plurality of touch electrodes and an upper surface of the first electrode are at a first vertical level relative to the base substrate, and a lower surface of the plurality of sensing electrodes and an upper surface of the second electrode are at a second vertical level relative to the base su

Assignees

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

Inventors

• Tao Yongchun
• Chen Yuju
• Wang Yingzi

Classifications

• B06B1/0622

  on one surface · CPC title

• B06B1/0253

  taken directly from the generator circuit · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0446

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

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title