Display devices and pixel for a display device

Patent metadata

Field	Value
Publication number	US-11061477-B2
Application number	US-201816631477-A
Country	US
Kind code	B2
Filing date	Jun 12, 2018
Priority date	Jul 17, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A display device is disclosed. The display device comprises an optical structure with a plurality of pixels configured to generate an optical image on a front side of the optical structure. The display device further includes a plurality of acoustic transducers configured to generate an acoustic field for stimulating the tactile sense of a human person based on a plurality of control signals in a space in front of the front side of the optical structure. The plurality of acoustic transducers are located on a back side of the optical structure. The display device further includes a control circuit configured to generate at least one of the plurality of control signals based on at least one acoustic property of the optical structure.

First claim

The invention claimed is:

1. A display device, comprising:
an optical structure with a plurality of pixels configured to generate an optical image on a front side of the optical structure;
a plurality of acoustic transducers configured to generate an acoustic field for stimulating the tactile sense of a human person in a space in front of the front side of the optical structure based on a plurality of control signals, wherein the plurality of acoustic transducers are arranged on a back side of the optical structure; and
a control circuit configured to pre-distort at least one of the plurality of control signals based on at least one acoustic property of the optical structure, wherein the control signals compensate for an acoustic distortion of the acoustic field.

2. The display device according to claim 1 , wherein the control circuit is configured to pre-distort all of the plurality of control signals based on the at least one acoustic property of the optical structure.

3. The display device according to claim 1 wherein the acoustic field is associated with an object in the optical image.

4. The display device according to claim 3 , wherein the control circuit is configured to generate the plurality of control signals based on a state of the object in the optical image.

5. The display device according to claim 1 , wherein the control circuit is configured to generate the plurality of control signals such that a focus point of the acoustic field has a vertical distance of at least 2 cm to the front side of the optical structure.

6. The display device according to claim 1 , wherein the acoustic property of the optical structure is the acoustic transparency of the optical structure.

7. The display device according to claim 1 , wherein at least one of the plurality of acoustic transducers is configured to radiate acoustic waves having a frequency of at least 25 kHz.

8. The display device according to claim 1 , wherein the plurality of acoustic transducers are arranged on the back side of the optical structure in the form of a matrix.

9. The display device according to claim 1 , wherein at least one of the plurality of acoustic transducers is configured as a MEMS acoustic transducer.

10. The display device according to claim 1 , wherein at least one of the plurality of acoustic transducers is further configured to provide an output signal based on received acoustic waves.

11. A display device, comprising:
an optical structure with a plurality of pixels configured to generate an optical image on a front side of the optical structure;
a plurality of acoustic transducers configured to generate an acoustic field for stimulating the tactile sense of a human person in a space in front of the front side of the optical structure, wherein the plurality of acoustic transducers are arranged on the front side of the optical structure, and wherein the plurality of acoustic transducers are optically transparent for light having a wavelength in the range 380 nm to 750 nm.

12. The display device according to claim 11 , wherein at least one of the plurality of acoustic transducers is configured as a MEMS acoustic transducer.

13. The display device according to claim 11 , wherein at least one of the plurality of acoustic transducers is configured to radiate acoustic waves having a frequency of at least 25 kHz.

14. The display device according to claim 11 , wherein the acoustic transducers are controlled by control signals, the device further comprising:
a protective substrate covering the plurality of acoustic transducers; and
a control circuit configured to pre-distort at least one of the plurality of control signals based on at least one acoustic property of the protective substrate, wherein the control signals compensate for an acoustic distortion of the acoustic field.

15. A display device, comprising:
an optical structure with a plurality of pixels configured to generate an optical image on a front side of the optical structure, wherein the plurality of pixels are arranged on a carrier substrate of the optical structure;
a plurality of electromechanical transducers, configured to mechanically deform at least the carrier substrate based on a plurality of control signals such that an acoustic field for stimulating the tactile sense of a human person is formed in a space in front of the front side of the optical structure by the mechanical deformation of the carrier substrate; and
a control circuit configured to generate at least one of the plurality of control signals based on at least one mechanical property of the optical structure, wherein the control signals compensate for a deformation of the carrier substrate and/or the optical structure.

16. The display device according to claim 15 , wherein at least one of the plurality of electromechanical transducers is a piezoelectric actuator or a capacitive actuator.

17. The display device according to claim 15 , wherein the acoustic field is associated with an object in the optical image and the control circuit is further configured to generate the plurality of control signals based on a state of the object in the optical image.

Assignees

• Fraunhofer Ges Zur Foerderung Der Angewan
• Fraunhofer Ges Forschung

Inventors

• Tretbar Steffen
• Schmitt Daniel

Classifications

• G03H2001/0061

  in haptic applications when the observer interacts with the holobject · CPC title

• H04R2499/15

  Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops · CPC title

• H04R2400/03

  Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones · CPC title

• H04R2201/401

  2D or 3D arrays of transducers · CPC title

• H04R1/403

  loud-speakers · CPC title