Spatial light modulation module, spatial light modulation element, light shielding plate, and projection type display device

Patent metadata

Field	Value
Publication number	US-2022078381-A1
Application number	US-201917309947-A
Country	US
Kind code	A1
Filing date	Dec 7, 2019
Priority date	Jan 17, 2019
Publication date	Mar 10, 2022
Grant date	—

Abstract

An object of the present technology is to provide a technology for processing light that reaches a light shielding plate that defines a reachable range of light to a panel unit. The present technology provides a spatial light modulation module including: a panel unit that forms image display light; and a light shielding plate that defines an illumination light reachable range of the panel unit, in which at least a part of an illumination light reachable surface of the light shielding plate is inclined with respect to a reflection surface of the panel unit. It is preferable that at least a part of the illumination light reachable surface reflects the illumination light. Furthermore, the present technology also provides a spatial light modulation element and a light shielding plate included in the module. Furthermore, the present technology also provides a projection type display device including the module.

First claim

1 . A spatial light modulation module comprising:
a panel unit that forms image display light; and a light shielding plate that defines an illumination light reachable range of the panel unit, wherein at least a part of an illumination light reachable surface of the light shielding plate is inclined with respect to a reflection surface of the panel unit.

2 . The spatial light modulation module according to claim 1 , wherein the at least a part of the illumination light reachable surface reflects illumination light.

3 . The spatial light modulation module according to claim 1 , wherein the panel unit is a reflective liquid crystal panel.

4 . The spatial light modulation module according to claim 1 , wherein illumination light reflected by the illumination light reachable surface is not captured by a projection lens through which the image display light passes.

5 . The spatial light modulation module according to claim 1 ,
wherein an angle θ formed by the at least a part of the illumination light reachable surface and the reflection surface of the panel unit satisfies Equation (1) below,
θ>sin −1 (1/2F#)  (1)

and
in Equation (1), F# is an F value on a panel unit side of a projection lens through which the image display light passes.

6 . The spatial light modulation module according to claim 1 , wherein, in the light shielding plate, an edge region that defines a window that defines the illumination light reachable range of the panel unit is inclined with respect to the reflection surface of the panel unit.

7 . The spatial light modulation module according to claim 6 , wherein the edge region is inclined with respect to the reflection surface of the panel unit over an entire circumference of the window.

8 . The spatial light modulation module according to claim 1 , wherein a retardation plate is stacked on the light shielding plate.

9 . The spatial light modulation module according to claim 8 , wherein a phase of illumination light is adjusted so that the retardation plate imparts, to the illumination light reflected by the light shielding plate, a phase difference equal to a phase difference imparted to an image display light by a pre-tilt of the panel unit.

10 . The spatial light modulation module according to claim 1 , wherein the light shielding plate is connected to a heat receiving medium that receives heat of the light shielding plate.

11 . The spatial light modulation module according to claim 10 , wherein the light shielding plate and/or the heat receiving medium is formed including a metal material.

12 . The spatial light modulation module according to claim 1 , wherein the light shielding plate is a photoelectric conversion element.

13 . The spatial light modulation module according to claim 1 , further comprising a damper that prevents illumination light reflected by the light shielding plate from reaching a projection lens or a projection lens housing.

14 . The spatial light modulation module according to claim 1 , wherein an end portion of an edge region that defines a window that defines the illumination light reachable range of the panel unit does not reflect illumination light.

15 . The spatial light modulation module according to claim 1 , wherein a surface of the light shielding plate opposite to the illumination light reachable surface absorbs light.

16 . The spatial light modulation module according to claim 1 , wherein the panel unit includes a DMD array.

17 . A spatial light modulation module comprising:
a panel unit that forms image display light; and a light shielding plate that defines an illumination light reachable range of the panel unit, wherein a retardation plate is stacked on the light shielding plate.

18 . A spatial light modulation element used in combination with a light shielding plate that defines an illumination light reachable range of a panel unit that forms image display light in the spatial light modulation element, at least a part of an illumination light reachable surface of the light shielding plate being inclined to a reflection surface of the panel unit.

19 . A light shielding plate used for defining an illumination light reachable range of a panel unit that forms image display light in a spatial light modulation element, at least a part of an illumination light reachable surface being inclined to a reflection surface of the panel unit.

20 . A projection type display device comprising a spatial light modulation module including: a panel unit that forms image display light; and a light shielding plate that defines an illumination light reachable range of the panel unit, wherein at least a part of an illumination light reachable surface of the light shielding plate is inclined with respect to a reflection surface of the panel unit.

Assignees

• Sony Group Corp

Inventors

• Yonezawa Gen
• Ohmi Motosuke

Classifications

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G03B21/28

  Reflectors in projection beam {(in illumination beam G03B21/2066)} · CPC title

• G03B21/005

  Projectors using an electronic spatial light modulator but not peculiar thereto · CPC title

• G03B21/16

  Cooling; Preventing overheating · CPC title