Diffraction sheet and method for manufacturing the same, three-dimensional display device, light beam reproduction device, three-dimensional spatial display system, light beam reproduction method, and program

Patent metadata

Field	Value
Publication number	US-2023204832-A1
Application number	US-202318171576-A
Country	US
Kind code	A1
Filing date	Feb 20, 2023
Priority date	Aug 20, 2020
Publication date	Jun 29, 2023
Grant date	—

Abstract

A three-dimensional display device including a diffraction sheet including a transparent substrate, and a diffraction layer having a first diffraction pattern formed in a first array pattern and a second diffraction pattern formed in a second array pattern on the transparent substrate, the diffraction sheet measuring 10 inches or more in diagonal; one of a liquid crystal device having a plurality of pixels and a color filter having a plurality of types of color filters; and a light source. The first diffraction pattern and the second diffraction pattern are overlapped with the pixels or the color filters in a direction normal to the diffraction sheet with an amount of displacement being 1/10 or less of a pitch of the pixels or the color filters.

First claim

What is claimed is:

1 . A three-dimensional display device, comprising:
a diffraction sheet including a transparent substrate, and a diffraction layer having a first diffraction pattern formed in a first array pattern and a second diffraction pattern formed in a second array pattern on the transparent substrate, the diffraction sheet measuring 10 inches or more in diagonal; one of a liquid crystal device having a plurality of pixels and a color filter having a plurality of types of color filters; and a light source, wherein the first diffraction pattern and the second diffraction pattern are overlapped with the pixels or the color filters in a direction normal to the diffraction sheet with an amount of displacement being 1/10 or less of a pitch of the pixels or the color filters.

2 . The three-dimensional display device according to claim 1 , wherein the diffraction sheet is positioned between the light source and the liquid crystal device or the color filter.

3 . The three-dimensional display device according to claim 1 , wherein the liquid crystal device or the color filter is positioned between the light source and the diffraction sheet.

4 . The three-dimensional display device according to claim 1 , wherein the diffraction layer is bonded to the liquid crystal device or the color filter with a transparent pressure-sensitive adhesive material.

5 . The three-dimensional display device according to claim 1 , further comprising:
a gas layer or a vacuum layer formed adjacent to the diffraction layer.

6 . A method for manufacturing a diffraction sheet, comprising:
forming a first uncured resin layer on a transparent substrate measuring 10 inches or more in diagonal; bringing a first diffraction pattern formed on a first surface of a first plate into contact with the first uncured resin layer, the first diffraction pattern being formed in a rectangular area measuring 10 inches or more in diagonal; placing a first mask having a plurality of first apertures formed based on a first array pattern on the first plate; irradiating the first mask with light to cure a portion of the first uncured resin layer that overlaps the first apertures; forming a second uncured resin layer on a surface of the substrate on which the first uncured resin layer is formed; bringing a second diffraction pattern, which is different from the first diffraction pattern, formed on a first surface of a second plate into contact with the second uncured resin layer, the second diffraction pattern being formed in a rectangular area measuring 10 inches or more in diagonal; placing a second mask having a plurality of second apertures formed based on a second array pattern different from the first array pattern on the second plate; and irradiating the second mask with light to cure a portion of the second uncured resin layer that overlaps the second apertures.

7 . The method according to claim 6 , wherein the first uncured resin layer has a cured hardness of 0.5 MPa to 100 GPa at room temperature.

8 . The method according to claim 6 , wherein the forming of the second uncured resin layer produces the second uncured resin layer thicker than the first uncured resin layer.

9 . The method according to claim 8 , wherein the second uncured resin layer and the first uncured resin layer have a difference in thickness which is larger than or equal to a height of the second diffraction pattern.

10 . The method according to claim 6 , wherein at least one of the first plate and the second plate has a release layer on the first surface.

11 . The method according to claim 10 , wherein the release layer includes, as a main component, at least one of a thermosetting resin, silicone, a fluorine-based resin, and a polymer having an alkyl group.

12 . A diffraction sheet, comprising:
a transparent substrate; and a diffraction layer having a first diffraction pattern formed in a first array pattern on the substrate and a second array pattern formed in a second diffraction pattern different from the first array pattern on a same side of the substrate as the first diffraction pattern, wherein the second diffraction pattern is thicker than the first diffraction pattern.

13 . The diffraction sheet according to claim 12 , wherein the second diffraction pattern and the first diffraction pattern have a difference in thickness which is larger than or equal to a height difference between surface concavities and convexities of the second diffraction pattern.

14 . The diffraction sheet according to claim 12 , wherein the second diffraction pattern and the first diffraction pattern have a difference in thickness of 100 nm-10 μm.

15 . The diffraction sheet according to claim 12 , further comprising:
a color filter including a plurality of color filters and positioned between the first and second diffraction patterns and the substrate, wherein the first and second diffraction patterns have displacement relative to the color filters in a plan view in an amount of 1/10 or less of a pitch of the color filters.

16 . The diffraction sheet according to claim 12 , wherein the first diffraction pattern and the second diffraction pattern include a color material, and
the diffraction layer functions as a color filter.

17 . The diffraction sheet according to claim 12 , wherein the first diffraction pattern and the second diffraction pattern have a gap of 1 μm-100 μm.

18 . The diffraction sheet according to claim 12 , wherein the diffraction sheet has a rectangular shape in a plan view measuring 10 inches or more in diagonal.

19 . A light beam reproduction device configured to reproduce light beams virtually emitted from a stereoscopic image when displaying the stereoscopic image in a reproduction space, the light beam reproduction device comprising:
a stereoscopic image display unit that displays the stereoscopic image as at least one of a virtual image and a real image by light beams emitted from element cells included in an element cell set which includes the element cells formed two-dimensionally corresponding to a reproduction screen where the light beams emitted from a surface of the stereoscopic image reach, wherein the stereoscopic image display unit displays the stereoscopic image in a region at a depth distance corresponding to a social distance in the reproduction space, and a size of each of the element cells in the element cell set and a pitch of the element cells formed two-dimensionally are determined according to a degree to which the stereoscopic image displayed in the reproduction space is observed by an observer.

20 . The light beam reproduction device according to claim 19 , further comprising:
a signal processing unit that divides a set of the light beams emitted from a surface of the stereoscopic image according to positions on the reproduction screen, associates each of divided light beams to each of the element cells of the element cell set, and calculates components of one or more light beams to be reproduced for each of the element cells of the element cell set.

21 . The light beam reproduction device according to claim 19 , wherein, when displaying the stereoscopic image in a region at a depth distance corresponding to a social distance in the reproduction space, the size of the element cells is determined according to a size of blur generated in the displayed stereoscopic image.

22 . The light beam reproduction device according to claim 19 , wherein, when displaying t

Assignees

• Toppan Inc

Inventors

• Suzuki Tsubasa
• Takahashi Susumu
• Honma Hideaki

Classifications

• G02B30/10 Primary

  using integral imaging methods · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• G02B5/32

  Holograms used as optical elements · CPC title

• G02B5/18 Primary

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• G03B35/08

  by simultaneous recording · CPC title