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

Patent metadata

Field	Value
Publication number	US-10969744-B2
Application number	US-201816114273-A
Country	US
Kind code	B2
Filing date	Aug 28, 2018
Priority date	May 1, 2015
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A holographic display apparatus includes: 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 holographic display apparatus comprising:
a light source configured to emit light;
a spatial light modulator configured to reproduce a hologram image by modulating an amplitude of the light based on an amplitude modulation value; and
a controller configured to extract the amplitude modulation value from hologram data of the hologram image to be reproduced and to provide the amplitude modulation value to the spatial light modulator,
wherein the hologram data is expressed as a complex number,
the controller is further configured to select one of a positive amplitude part and a negative amplitude part in a real part of the hologram data expressed as the complex number, provide an absolute value of the selected one of the positive amplitude part and the negative amplitude part to the spatial light modulator as the amplitude modulation value, and process a remaining portion of the real part of the hologram data that is not selected as 0.

2. The holographic display apparatus of claim 1 , wherein the controller is further configured to select the positive amplitude part and process the negative amplitude part as 0 while reproducing a hologram image of a first frame, and to select the negative amplitude part and process the positive amplitude part as 0 while reproducing a hologram image of a second frame subsequent to the first frame.

3. The holographic display apparatus of claim 1 , wherein the controller is further configured to remove a high spatial frequency component of the extracted amplitude modulation value via a low pass filter before providing the extracted amplitude modulation value to the spatial light modulator.

4. A holographic display apparatus comprising:
a light source configured to emit light;
a spatial light modulator configured to reproduce a hologram image by modulating an amplitude of the light based on an amplitude modulation value; and
a controller configured to extract the amplitude modulation value from hologram data of the hologram image to be reproduced and provide the amplitude modulation value to the spatial light modulator,
wherein the hologram data is expressed as a complex number, and
the controller is configured to calculate the amplitude modulation value by adding at least one of a value of a real part of the hologram data and a value of an imaginary part of the hologram data to an absolute value of the hologram data expressed as the complex number.

5. The holographic display apparatus of claim 4 , wherein the amplitude modulation value is a sum of the absolute value of the hologram data expressed as the complex number and the value of the real part of the hologram data.

6. The holographic display apparatus of claim 4 , wherein the amplitude modulation value is a sum of the absolute value of the hologram data expressed as the complex number and the value of the imaginary part of the hologram data.

7. The holographic display apparatus of claim 4 , wherein the controller is configured to calculate the amplitude modulation value by adding a value obtained by multiplying the value of the real part of the hologram data expressed as the complex number and a first coefficient, a value obtained by multiplying the value of the imaginary part of the hologram data and a second coefficient, and a value obtained by multiplying the absolute value of the hologram data and a third coefficient.

8. The holographic display apparatus of claim 7 , wherein the third coefficient has a value other than 0 and values of the first and second coefficients are selected such that the amplitude modulation value is greater than 0 at all coordinates.

Assignees

• Samsung Electronics Co Ltd

Inventors

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

Classifications

• G03H2001/0445

  Off-axis recording arrangement (G03H2001/0456 takes precedence) · 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

• G03H2001/303

  Interleaved sub-holograms, e.g. three RGB sub-holograms having interleaved pixels for reconstructing coloured holobject · CPC title