Stereoscopic surface display device and operation method of the same

Patent metadata

Field	Value
Publication number	US-11921929-B2
Application number	US-202318106650-A
Country	US
Kind code	B2
Filing date	Feb 7, 2023
Priority date	Feb 24, 2022
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

Provided is a stereoscopic surface display device including a stereoscopic display unit having a cell area, wherein the stereoscopic display unit includes a first flexible layer, a first optical waveguide and a first optical output unit in the first flexible layer, wherein the first optical output unit are disposed in the cell area, a first light source disposed on a side of the stereoscopic display unit, wherein the first optical waveguide connects the first light source and the first optical output unit, a first photothermal response layer on the first flexible layer, wherein the first photothermal response layer is configured to receive output light emitted from the first optical output unit and emit thermal energy, and a shape deformation layer on the first photothermal response layer, wherein the shape deformation layer is configured to generate bending deformation by receiving the thermal energy from the first photothermal response layer.

First claim

What is claimed is:

1. A stereoscopic surface display device comprising a stereoscopic display unit having a cell area,
wherein the stereoscopic display unit comprises:
a first flexible layer;
a first optical waveguide and a first optical output unit that are in the first flexible layer, the first optical output unit being disposed in the cell area;
a first light source disposed on a side of the stereoscopic display unit, the first optical waveguide connecting the first light source and the first optical output unit;
a first photothermal response layer on the first flexible layer, the first photothermal response layer being configured to receive output light emitted from the first optical output unit and emit thermal energy; and
a shape deformation layer on the first photothermal response layer,
wherein the shape deformation layer is configured to generate bending deformation by receiving the thermal energy from the first photothermal response layer.

2. The stereoscopic surface display device of claim 1 , further comprising a control unit for controlling the first light source.

3. The stereoscopic surface display device of claim 2 , wherein the control unit is disposed outside the stereoscopic display unit.

4. The stereoscopic surface display device of claim 1 , wherein the shape deformation layer is configured to receive the thermal energy and change a coefficient of thermal expansion,
wherein a magnitude and a direction of the bending deformation are controlled according to an amount of change in the coefficient of thermal expansion.

5. The stereoscopic surface display device of claim 1 , wherein the stereoscopic display unit further comprises:
a second photothermal response layer on the shape deformation layer;
a second flexible layer on the second photothermal response layer; and
a second optical output unit in the second flexible layer,
wherein the second optical output unit is disposed within the cell area and vertically overlaps the first optical output unit,
wherein the shape deformation layer is sandwiched between the first photothermal response layer and the second photothermal response layer.

6. The stereoscopic surface display device of claim 5 , wherein the first optical output unit and the second optical output unit are each independently controlled from each other.

7. The stereoscopic surface display device of claim 1 , wherein the stereoscopic display unit further comprises a heat diffusion layer between the first flexible layer and the first photothermal response layer.

8. The stereoscopic surface display device of claim 7 , wherein the heat diffusion layer has an opening exposing the first optical output unit.

9. The stereoscopic surface display device of claim 1 , wherein the stereoscopic display unit is configured to be attachable to skin.

10. The stereoscopic surface display device of claim 1 , wherein the first photothermal response layer is a polymer film including a photo-thermal material.

11. The stereoscopic surface display device of claim 1 , wherein the shape deformation layer comprises a shape memory polymer.

12. A stereoscopic surface display device comprising a stereoscopic display unit having a plurality of cell areas,
wherein the stereoscopic display unit comprises;
a first flexible layer;
a plurality of lower optical output units in the first flexible layer, the plurality of lower optical output units being disposed in the plurality of cell areas, respectively;
a first photothermal response layer on the first flexible layer, wherein the first photothermal response layer is configured to receive lower light emitted from the plurality of lower optical output units and emit first thermal energy;
a shape deformation layer on the first photothermal response layer;
a second photothermal response layer on the shape deformation layer;
a second flexible layer on the second photothermal response layer; and
a plurality of upper optical output units in the second flexible layer,
wherein the second photothermal response layer is configured to receive upper light emitted from the plurality of upper optical output units and emit second thermal energy.

13. The stereoscopic surface display device of claim 12 , wherein bending deformation occurs through the first thermal energy or the second thermal energy in each of the plurality of cell areas.

14. The stereoscopic surface display device of claim 12 , further comprising:
a plurality of light sources disposed on a side of the stereoscopic display unit; and
a controller for controlling the plurality of light sources.

15. An operating method of a stereoscopic surface display device including a stereoscopic display unit having a cell area,
wherein the stereoscopic display unit comprises:
a flexible layer;
an optical waveguide and an optical output unit that are in the flexible layer, the optical output unit being disposed in the cell area;
a light source disposed on a side of the stereoscopic display unit, the optical waveguide connecting the light source and the optical output unit;
a photothermal response layer on the flexible layer; and
a shape deformation layer on the photothermal response layer,
wherein the operating method comprises:
irradiating incident light from the light source to the optical waveguide, the optical waveguide guiding the incident light to the optical output unit;
emitting output light from the optical output unit to the photothermal response layer, the photothermal response layer receiving the output light and generating thermal energy;
heating the shape deformation layer using the thermal energy, the shape deformation layer being heated so that a modulus of elasticity in the shape deformation layer decreases and a coefficient of thermal expansion in the shape deformation layer increases; and
generating bending deformation in the shape deformation layer through a difference between the increased coefficient of thermal expansion of the shape deformation layer and a coefficient of thermal expansion of the photothermal response layer.

16. The operating method of claim 15 , wherein the stereoscopic surface display device further comprises a control unit for controlling the light source.

17. The operating method of claim 15 , wherein the stereoscopic display unit further comprises a sensor unit,
wherein the operating method further comprises recognizing a user's touch applied to the cell area whose shape has changed by using the sensor unit.

18. The operating method of claim 15 , wherein a portion of the shape deformation layer that is outside the cell area does not change a shape of the portion.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Yun Sung Ryul
• Park Seung Koo
• Hwang Inwook
• Mun Seongcheol
• Choi Mi Jeong

Classifications

• G06F3/016 Primary

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

• F03G7/016

  Photosensitive actuators, e.g. using the principle of Crookes radiometer · CPC title

• G05D5/02

  of thickness, e.g. of rolled material (of specific materials B21B, B29C, B32B, C03B, D21F) · CPC title

• H04N13/393

  the volume being generated by a moving, e.g. vibrating or rotating, surface · CPC title

• G06F1/163

  Wearable computers, e.g. on a belt · CPC title