Holographic display apparatus for providing expanded viewing window

Patent metadata

Field	Value
Publication number	US-2018129166-A1
Application number	US-201715676336-A
Country	US
Kind code	A1
Filing date	Aug 14, 2017
Priority date	Nov 10, 2016
Publication date	May 10, 2018
Grant date	—

Abstract

A holographic display apparatus for providing an expanded viewing window is provided. The holographic display apparatus includes a spatial filter configured to allow a plurality of holographic images generated by 0th order or higher diffraction in a spatial light modulator to pass therethrough, and an image path conversion element configured to adjust a light path of the plurality of holographic images so that the plurality of holographic images are spaced apart from each other on a focal plane of an optical system.

First claim

What is claimed is:

1 . A holographic display apparatus comprising:
a light source configured to provide light; a spatial light modulator configured to form a hologram pattern, modulate the light from the light source in accordance with the hologram pattern and generate a plurality of holographic images by 0th order or higher diffraction; and an optical system comprising:
a spatial filter configured to allow the plurality of holographic images generated by the 0th order or higher diffraction in the spatial light modulator to pass through; and
an image path conversion element configured to adjust a light path of at least one of the plurality of holographic images so that the plurality of holographic images are spaced apart from each other on a focal plane of the optical system.

2 . The holographic display apparatus of claim 1 , wherein the optical system further comprises:
a first lens arranged between the spatial light modulator and the spatial filter; and a second lens arranged between the spatial filter and the focal plane of the optical system.

3 . The holographic display apparatus of claim 2 , wherein the image path conversion element is arranged between the first lens and the second lens.

4 . The holographic display apparatus of claim 1 , wherein the spatial filter comprises:
a first aperture configured to allow a 0th order holographic image generated by the 0th order diffraction to pass through; and a plurality of second apertures configured to respectively allow a plurality of higher order holographic images generated by ±1st order or the higher diffraction to pass through.

5 . The holographic display apparatus of claim 4 , wherein the image path conversion element comprises a plurality of refractive elements respectively arranged in light paths of the plurality of higher order holographic images.

6 . The holographic display apparatus of claim 5 , wherein the plurality of refraction elements are arranged such that a refraction angle of a holographic image increases as an order of the higher order holographic images increases.

7 . The holographic display apparatus of claim 5 , wherein the plurality of refractive elements are arranged in the plurality of second apertures, respectively.

8 . The holographic display apparatus of claim 1 , wherein the image path conversion element is configured such that a center interval between the plurality of holographic images is equal to spot sizes of the plurality of holographic images focused on the focal plane of the optical system.

9 . The holographic display apparatus of claim 2 , wherein the second lens focuses a first holographic image, among the plurality of holographic images, at a first location on the focal plane, and focuses a second holographic image, among the plurality of holographic images, at a second location on the focal plane, the second location being different from the first location.

10 . A holographic display apparatus comprising:
a light source configured to provide light; a spatial light modulator configured to form a hologram pattern; and modulate the light from the light source in accordance with the hologram pattern and generate a holographic image; and an optical system comprising:
a spatial filter configured to pass the holographic image; and
an image dividing element configured to divide the holographic image into a plurality of sub-holographic images so that the plurality of sub-holographic images are spaced apart from each other on a focal plane of the optical system.

11 . The holographic display apparatus of claim 10 , wherein the optical system further comprises:
a first lens arranged between the spatial light modulator and the spatial filter; and a second lens arranged between the spatial filter and the focal plane of the optical system.

12 . The holographic display apparatus of claim 11 , wherein the image dividing element comprises at least one of a diffraction grating for dividing a holographic image by a diffraction phenomenon and a beam displacer for dividing a holographic image by a birefringence phenomenon.

13 . The holographic display apparatus of claim 11 , wherein the image dividing element is arranged between the spatial filter and the second lens or arranged between the second lens and the focal plane of the optical system.

14 . The holographic display apparatus of claim 11 , wherein the image dividing element is on a surface of the second lens and integrally formed with the second lens.

15 . The holographic display apparatus of claim 11 , wherein the spatial filter comprises an aperture through which the holographic image passes, and the first lens is configured to focus the holographic image on the aperture.

16 . The holographic display apparatus of claim 10 , wherein the optical system further comprises a first lens arranged between the spatial light modulator and the spatial filter, and
wherein the image dividing element is a lens array comprising a plurality of second lenses arranged between the spatial filter and the focal plane of the optical system.

17 . The holographic display apparatus of claim 10 , wherein the image dividing element is configured such that a center interval between the plurality of sub-holographic images is equal to spot sizes of the plurality of sub-holographic images focused on the focal plane of the optical system.

18 . The holographic display apparatus of claim 10 , wherein the holographic image is a 0th order holographic image generated by 0th order diffraction in the spatial light modulation.

19 . A holographic display apparatus comprising:
a light source configured to provide light; a spatial light modulator configured to form a hologram pattern; and modulate the light from the light source in accordance with the hologram pattern and generate a holographic image; and an optical system comprising:
an image dividing element configured to divide the holographic image into a plurality of sub-holographic images so that the plurality of sub-holographic images are spaced apart from each other on a focal plane of the optical system; and
a spatial filter configured to allow the plurality of sub-holographic images to pass through.

20 . The holographic display apparatus of claim 19 , wherein the image dividing element comprises at least one of a diffraction grating for dividing a holographic image by a diffraction phenomenon, a beam displacer for dividing a holographic image by a birefringence phenomenon, and a lens array comprising a plurality of lens elements.

21 . The holographic display apparatus of claim 19 , wherein the optical system further comprises a lens arranged between the spatial light modulator and the spatial filter.

22 . The holographic display apparatus of claim 21 , wherein the image dividing element is arranged between the spatial light modulator and the lens or between the lens and the spatial filter.

23 . The holographic display apparatus of claim 19 , wherein the spatial filter is on the focal plane of the optical system.

24 . The holographic display apparatus of claim 19 , wherein the spatial filter comprises a plurality of apertures arranged to allow only a 0th order sub-holographic image, among the plurality of sub-holographic images, to pass through.

25 . The holographic display apparatus of claim 19 , wherein the image dividing element is configured such that a center interval between the plurality of

Assignees

• Samsung Electronics Co Ltd

Inventors

• Seo Wontaek
• Seo Juwon
• Sung Geeyoung
• Kim Yuntae

Classifications

• G03H1/2205 Primary

  using downstream optical component · CPC title

• G03H1/2294

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

• G02B27/0103 Primary

  comprising holographic elements · CPC title

• G03H2223/17

  Element having optical power · CPC title

• G03H2001/2239

  Enlarging the viewing window · CPC title