Holographic display apparatus and method for providing expanded viewing window

Patent metadata

Field	Value
Publication number	US-11454928-B2
Application number	US-201916596914-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	Nov 6, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

Provided is a holographic display apparatus including a light source configured to emit light, a spatial light modulator configured to form a hologram pattern to modulate the light incident thereon and reproduce a hologram image, the spatial light modulator including a plurality of display pixels that are arranged two-dimensionally, and an optical element provided opposite a light incidence surface of the spatial light modulator or a light exit surface of the spatial light modulator, the optical element including an array of a plurality of light transmission patterns that are arranged irregularly.

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 form a hologram pattern to modulate the light incident thereon and reproduce a hologram image, the spatial light modulator comprising a plurality of display pixels that are arranged two-dimensionally;
an optical element provided opposite a light incidence surface of the spatial light modulator or a light exit surface of the spatial light modulator, the optical element comprising an array of a plurality of light transmission patterns, the plurality of light transmission patterns being arranged irregularly;
an image processor configured to:
generate hologram data based on the hologram image to be reproduced at a resolution corresponding to a resolution of the array of the plurality of light transmission patterns,
extract hologram data that correspond to positions of the plurality of light transmission patterns among the generated hologram data, and
provide the extracted hologram data to the spatial light modulator.

2. The holographic display apparatus of claim 1 , wherein the resolution of the array of the plurality of light transmission patterns is greater than a resolution of the spatial light modulator.

3. The holographic display apparatus of claim 1 , wherein the plurality of display pixels of the spatial light modulator correspond to the plurality of light transmission patterns, respectively, and
wherein each of the plurality of display pixels is configured to display the hologram pattern based on the position of each of the plurality of light transmission patterns corresponding thereto.

4. The holographic display apparatus of claim 1 , wherein the plurality of light transmission patterns of the optical element comprise a plurality of openings that are irregularly arranged on an opaque substrate.

5. The holographic display apparatus of claim 4 , wherein a size of each of the plurality of openings is less than a size of each of the plurality of display pixels of the spatial light modulator.

6. The holographic display apparatus of claim 5 , wherein one or more openings of the plurality of openings correspond to each of the plurality of display pixels of the spatial light modulator.

7. The holographic display apparatus of claim 6 , wherein each of the plurality of openings corresponds to each of the display pixels of the spatial light modulator.

8. The holographic display apparatus of claim 5 , wherein at least one of the plurality of display pixels of the spatial light modulator do not correspond to an opening among the plurality of openings.

9. The holographic display apparatus of claim 5 , wherein relative positions between the plurality of display pixels of the spatial light modulator and the plurality of openings of the optical element respectively corresponding thereto are irregular.

10. The holographic display apparatus of claim 9 , wherein a relative position between a first display pixel of the spatial light modulator and a first opening of the optical element corresponding thereto is different from a relative position between a second display pixel of the spatial light modulator and a second opening of the optical element corresponding thereto.

11. The holographic display apparatus of claim 4 , wherein a number of the plurality of openings of the optical element is equal to or greater than a number of the plurality of display pixels of the spatial light modulator.

12. The holographic display apparatus of claim 11 , wherein the number of the plurality of openings of the optical element is equal to the number of the plurality of display pixels of the spatial light modulator.

13. The holographic display apparatus of claim 1 , wherein the plurality of light transmission patterns of the optical element comprise a plurality of micro lenses arranged irregularly and two-dimensionally.

14. The holographic display apparatus of claim 13 , wherein a number of the plurality of micro lenses of the optical element is equal to or greater than a number of the plurality of display pixels of the spatial light modulator.

15. The holographic display apparatus of claim 14 , wherein the number of the plurality of micro lenses of the optical element is equal to the number of the plurality of display pixels of the spatial light modulator.

16. The holographic display apparatus of claim 13 , wherein one or more micro lenses among the plurality of micro lenses correspond to each of the plurality of display pixels of the spatial light modulator.

17. The holographic display apparatus of claim 16 , wherein each of the one or more micro lens corresponds to each of the plurality of display pixels of the spatial light modulator.

18. The holographic display apparatus of claim 13 , wherein at least one of the plurality of display pixels of the spatial light modulator do not correspond to a micro lens among the plurality of micro lenses.

19. The holographic display apparatus of claim 13 , wherein relative positions between the plurality of display pixels of the spatial light modulator and centers of the plurality of micro lenses of the optical element respectively corresponding thereto are irregular.

20. The holographic display apparatus of claim 19 , wherein a relative position between a first display pixel of the spatial light modulator and a center of a first micro lens of the optical element corresponding thereto is different from a relative position between a second display pixel of the spatial light modulator and a center of a second micro lens of the optical element corresponding thereto.

21. The holographic display apparatus of claim 1 , wherein the spatial light modulator further comprises a color filter array that comprises:
a plurality of first color filters configured to transmit only light of a first wavelength;
a plurality of second color filters configured to transmit only light of a second wavelength that is different from the first wavelength; and
a plurality of third color filters configured to transmit only light of a third wavelength that is different from the first wavelength and the second wavelength.

22. The holographic display apparatus of claim 21 , wherein the plurality of first color filters, the plurality of second color filters, and the plurality of third color filters are irregularly provided in the color filter array.

23. The holographic display apparatus of claim 22 , wherein relative positions between the plurality of first color filters of the spatial light modulator and the plurality of light transmission patterns of the optical element respectively corresponding thereto are irregular,
wherein relative positions between the plurality of second color filters of the spatial light modulator and the plurality of light transmission patterns of the optical element respectively corresponding thereto are irregular, and
wherein relative positions between the plurality of third color filters of the spatial light modulator and the plurality of light transmission patterns of the optical element respectively corresponding thereto are irregular.

24. The holographic display apparatus of claim 1 , wherein the optical element further comprises:
a first optical element comprising a plurality of openings arranged irregularly in an opaque substrate; and
a second optical element comprising a plurality of micro lenses arranged irregularly and two-dimensionally.

25. The holog

Assignees

• Samsung Electronics Co Ltd

Inventors

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

Classifications

• G03H1/2286

  Particular reconstruction light (G03H1/24 takes precedence); Beam properties · CPC title

• G03H1/2294 Primary

  Addressing the hologram to an active spatial light modulator · CPC title

• G03H2223/15

  Colour filter, e.g. interferential colour filter · CPC title

• G03H1/2205

  using downstream optical component · CPC title

• G03H1/0005 Primary

  Adaptation of holography to specific applications (holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042) · CPC title