Holographic display device and control method thereof, computer non-transient readable storage medium and computer program product

• US 10,642,223 B2
• Filed: 02/27/2018
• Issued: 05/05/2020
• Est. Priority Date: 02/28/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Chen, Hao
• Primary Examiner(s): Carruth, Jennifer D.
• Application Number:
  US15/906,780
• Publication Number:
  US 20180246468A1
• Time in Patent Office: 798 Days
• Field of Search: None
• CPC Class Codes: G02B 27/0938 Using specific optical elements
• CPC Class Codes: G02B 5/32 Holograms used as optical elements
• CPC Class Codes: G02B 7/02 for lenses supports for magnifying lenses G02B25/002
• CPC Class Codes: G02F 1/292 by controlled diffraction or phased-array beam steering controlled diffraction for optical switching G02F1/31
• CPC Class Codes: G03H 1/2205 using downstream optical component
• CPC Class Codes: G03H 1/2294 Addressing the hologram to an active spatial light modulator
• CPC Class Codes: G03H 2001/0212 Light sources or light beam properties G03H1/06, G03H1/24 take precedence; corresponding details, see subgroups of G03H2222/00
• CPC Class Codes: G03H 2001/0224 Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
• CPC Class Codes: G03H 2001/2239 Enlarging the viewing window
• CPC Class Codes: G03H 2001/2292 Using scanning means
• CPC Class Codes: G03H 2225/10 Shape or geometry
• CPC Class Codes: G03H 2225/12 2D SLM
• CPC Class Codes: G03H 2225/25 Optically addressed SLM [OA-SLM]
• CPC Class Codes: G03H 2226/05 Means for tracking the observer

Abstract

Embodiments of the present disclosure provide a holographic display device. The holographic display device includes a spatial light modulator and a light source unit. The light source unit is provided on the light entry side of the spatial light modulator and configured to providing read-out light to the spatial light modulator. The spatial light modulator includes at least one loading portion for receiving a write-in signal, which comprises a plurality of pixel units arranged in a matrix form, and the light exit surface of at least a part of which is a first cambered surface protruding in a direction away from the light source unit.

Claims

1. A holographic display device, comprising a spatial light modulator and a light source unit provided on a light entry side of the spatial light modulator and configured to provide read-out light to the spatial light modulator, wherein,

the spatial light modulator comprises at least one loading portion configured to receive a write-in signal, which comprises a plurality of pixel units arranged in a matrix form, and a light exit surface of at least a part of which is a first cambered surface protruding in a direction away from the light source unit;

the holographic display device further comprises a collector configured to acquire an observation position, and a deflecting device, which is connected to the collector, and

the deflecting device is provided on a light exit side of the spatial light modulator, covers at least a part of the at least one loading portion, and is configured to deflect the output light of the part of the at least one loading portion covered by the deflecting device to the observation position.

2. The holographic display device according to claim 1, wherein, the deflecting device comprises at least one light deflecting element, and there is one-to-one correspondence between the at least one light deflecting element and the at least one loading portion.

3. The holographic display device according to claim 2, wherein, the at least one light deflecting element comprises a liquid crystal grating.

4. The holographic display device according to claim 2, wherein, the deflecting device further comprises a bracket, and the light deflecting element comprises a convex lens, at least one deflection direction of which is adjustable, and which is movably mounted on the bracket.

5. The holographic display device according to claim 1, wherein, the at least one loading portion comprises at least two loading portions, the light exit surface of a part of the at least two loading portions is a second cambered surface protruding in a direction close to the light source unit, and

the first cambered surface and the second cambered surface are located at different loading portions of the at least two loading portions.

6. The holographic display device according to claim 1, wherein, light exit surfaces of all of at least one loading portions of the spatial light modulator are the first cambered surface, and all of the at least one loading portion are connected end to end successively to form a ring.

7. The holographic display device according to claim 6, wherein, the light source unit is located within the ring in the spatial light modulator.

8. The holographic display device according to claim 1, wherein, the light source unit comprises a laser and a collimating beam expander disposed in turn on the light entry side of the spatial light modulator, the collimating beam expander being configured to convert the light emitted from the laser into a surface light source.

9. The holographic display device according to claim 1, wherein, the light source unit comprises at least one LED light source.

10. The holographic display device according to claim 1, wherein, the holographic display device further comprises:

a controller connected to the spatial light modulator and configured to load holographic data of one frame of a hologram to the spatial light modulator, and wherein,

the light source unit comprises at least one light source, and there is one-to-one correspondence between the at least one light source and the at least one loading portion, and each of the at least one light source is connected to the controller which is configured to;

in a situation that one or more loading portions of the at least one loading portion are addressed, open the light sources corresponding to positions of the one or more loading portions to be addressed in the light source unit, and close the remaining light sources in the light source unit.

11. A control method of controlling the holographic display device according to claim 10, wherein, the control method comprises:

acquiring user information which includes a current viewing position of a user;

generating a deflection command based on the collected user information, the deflection command being configured to control a deflection angle of the deflection device in order to deflect output light so as to deflect a formed holographic image to the current observation position of the user.

12. The control method according to claim 11, wherein, the step of generating a deflection command based on the collected user information includes:

determining a user based on the user information, and generating the deflection command in a situation that the user meets a default condition.

13. The control method according to claim 12, wherein, the user information comprises a facial feature of the user, and the default condition comprises at least one of a predetermined location and the user'"'"'s age range.

14. The control method according to claim 12, wherein, the method further comprises:

determining one or more of the at least one loading portion of the spatial light modulator as current loading portions according to the current observation position of the user;

opening only the light source corresponding to the current loading portions in the light source unit, so as to provide the read-out light for the current loading portions;

making only the current loading portions in the spatial light modulator to receive a write-in signal.

15. A computer non-transient readable storage medium storing computer instructions configured to, when executed by a processor, cause the processor to perform the control method of claim 11.

16. A computer program product comprising instructions that, when running on a computer, cause the computer to execute the control method of claim 11.