Holographic display apparatus and holographic display method for providing enhanced image quality

Patent metadata

Field	Value
Publication number	US-11327439-B2
Application number	US-201916596933-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	May 1, 2015
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Provided is a holographic display apparatus including a light source configured to emit light; a spatial light modulator configured to sequentially generate hologram patterns for modulating the light and to sequentially reproduce frames of hologram images based on the hologram patterns; and a controller configured to provide hologram data signals to the spatial light modulator, the hologram data signals being used to sequentially generate the hologram patterns. The controller is configured to further provide, to the spatial light modulator, diffraction pattern data signals for forming periodic diffraction patterns for adjusting locations of the hologram images to be reproduced on a hologram image plane, the diffraction pattern data signals being configured to move the periodic diffraction patterns on the spatial light modulator along a predetermined direction for each of the frames.

First claim

What is claimed is:

1. A controller for a holographic display apparatus comprising a spatial light modulator, the controller comprising a processor configured to:
generate a first frame hologram data signal comprising information of a first frame hologram pattern for reproducing a first frame hologram image for a first frame and a first frame diffraction pattern data signal comprising information of a first frame periodic diffraction pattern for adjusting a location of the first frame hologram image to be reproduced;
generate a first final signal comprising the first frame hologram data signal and the first frame diffraction pattern data signal;
provide the first final signal to the spatial light modulator;
generate a second frame hologram data signal comprising information of a second frame hologram pattern for reproducing a second frame hologram image for a second frame and a second frame diffraction pattern data signal comprising information of a second frame periodic diffraction pattern for adjusting a location of the second frame hologram image to be reproduced;
generate a second final signal comprising the second frame hologram data signal and the second frame diffraction pattern data signal; and
provide the second final signal to the spatial light modulator,
wherein the processor is further configured to generate the first frame diffraction pattern data signal and the second frame diffraction pattern data signal such that a location of the second frame periodic diffraction pattern formed on the spatial light modulator in the second frame is moved along a predetermined direction compared to a location of the first frame periodic diffraction pattern formed on the spatial light modulator in the first frame,
wherein each of the first frame hologram image and the second frame hologram image comprises a first color image, a second color image, and a third color image, the first color image, the second color image and the third color image having different colors from each other,
wherein each of the first frame periodic diffraction pattern and the second frame periodic diffraction pattern comprises a first periodic diffraction pattern for adjusting a location of the first color image, a second periodic diffraction pattern for adjusting a location of the second color image, and a third periodic diffraction pattern for adjusting a location of the third color image, the first periodic diffraction pattern, the second periodic diffraction pattern, and the third periodic diffraction pattern having different periods from each other, and
wherein the processor is further configured to move the first frame periodic diffraction pattern and the second frame periodic diffraction pattern along the predetermined direction by respective distances that are less than a lowest common multiple of a period of the first periodic diffraction pattern, a period of the second periodic diffraction pattern, and a period of the third periodic diffraction pattern.

2. The controller of claim 1 , wherein the processor is further configured to set the period of the first periodic diffraction pattern, the period of the second periodic diffraction pattern, and the period of the third periodic diffraction pattern to be proportional to a wavelength of light of a first color, a wavelength of light of a second color, and a wavelength of light of a third color, respectively.

3. The controller of claim 1 , wherein the processor is further configured to:
generate an Nth frame hologram data signal comprising information of an Nth frame hologram pattern for reproducing an Nth frame hologram image for an Nth frame and an Nth frame diffraction pattern data signal comprising information of an Nth frame periodic diffraction pattern for adjusting a location of the Nth frame hologram image to be reproduced, N being an integer;
generate an Nth final signal comprising the Nth frame hologram data signal and the Nth frame diffraction pattern data signal; and
provide the Nth final signal to the spatial light modulator,
wherein the processor is further configured to generate the Nth frame diffraction pattern data signal such that a location of the Nth frame periodic diffraction pattern formed on the spatial light modulator in the Nth frame is moved along the predetermined direction compared to the location of the second frame periodic diffraction pattern formed on the spatial light modulator in the second frame.

4. The controller of claim 3 , wherein the processor is configured to move the first through Nth frame periodic diffraction patterns along the predetermined direction by respective distances that are selected as multiples of a value obtained by dividing the lowest common multiple of the period of the first periodic diffraction pattern, the period of the second periodic diffraction pattern, and the period of the third periodic diffraction pattern into N equal parts.

5. The controller of claim 3 , wherein the processor is configured to:
determine the location of the first frame periodic diffraction pattern formed on the spatial light modulator in the first frame based on a first phase of a prism grating function for generating the first frame diffraction pattern data signal;
determine the location of the second frame periodic diffraction pattern formed on the spatial light modulator in the second frame based on a second phase of the prism grating function for generating the second frame diffraction pattern data signal; and
determine the location of the Nth frame periodic diffraction pattern formed on the spatial light modulator in the Nth frame based on an Nth phase of the prism grating function for generating the Nth frame diffraction pattern data signal.

6. The controller of claim 5 , wherein the first phase of the prism grating function for generating the first frame diffraction pattern data signal, the second phase of the prism grating function for generating the second frame diffraction pattern data signal, and the Nth phase of the prism grating function for generating the Nth frame diffraction pattern data signal are different from each other.

7. The controller of claim 6 , wherein the processor is further configured to sequentially change the first through Nth phases of the prism grating functions while sequentially reproducing the first through Nth frame hologram images.

8. The controller of claim 6 , wherein the processor is further configured to irregularly change the first through Nth phases of the prism grating functions while sequentially reproducing the first through Nth frame hologram images.

9. The controller of claim 1 , wherein the processor is further configured to generate the first final signal by multiplying the first frame hologram data signal by the first frame diffraction pattern data signal and generate the second final signal by multiplying the second frame hologram data signal by the second frame diffraction pattern data signal.

10. A method of generating a data signal for a holographic display apparatus comprising:
generating a first frame hologram data signal comprising information of a first frame hologram pattern for reproducing a first frame hologram image for a first frame and a first frame diffraction pattern data signal comprising information of a first frame periodic diffraction pattern for adjusting a location of the first frame hologram image to be reproduced;
generating a first final signal comprising the first frame hologram data signal and the first frame diffraction pattern data signal;
generating a second frame hologram data signal comprising information of a second frame hologram pattern for reproducing a second frame hologram image for a second frame and a second frame diffraction pattern data signal comprising i

Assignees

• Samsung Electronics Co Ltd

Inventors

• Seo Wontaek
• Lee Hongseok
• Seo Juwon
• Song Hoon
• An Jungkwuen

Classifications

• G03H1/28 Primary

  superimposed holograms only · CPC title

• G03H2001/0825

  Numerical processing in hologram space, e.g. combination of the CGH [computer generated hologram] with a numerical optical element · CPC title

• G03H1/0486 Primary

  Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations · CPC title

• G03H2001/266

  Wavelength multiplexing · CPC title

• G03H2210/454

  into planes · CPC title