TRANSPARENT SCREEN AND IMAGE DISPLAY SYSTEM

• US 20190079380A1
• Filed: 11/01/2018
• Published: 03/14/2019
• Est. Priority Date: 05/02/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: YANAI, Yujiro, NAGAI, Michio, YAMAMOTO, Akira
• Granted Patent: US 10,642,145 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/0977 Reflective elements
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G03B 21/604 Polarised screens
• CPC Class Codes: G03B 21/62 Translucent screens

Abstract

Provided are a transparent screen having high transparency in which a hot spot caused by transmitted light can be reduced; and an image display system in which visibility of a screen is excellent and a hot spot is reduced by using the transparent screen. The transparent screen includes, in this order: a first λ/4 plate; a reflecting layer that has a structure obtained by immobilizing a cholesteric liquid crystalline phase and reflects a part of incidence light; and a polarizing film that has an absorption axis in a thickness direction.

Claims

1. A transparent screen comprising, in this order:

a first λ

/4 plate;

a reflecting layer that has a structure obtained by immobilizing a cholesteric liquid crystalline phase and reflects a part of incidence light; and

a polarizing film that has an absorption axis in a thickness direction.

2. The transparent screen according to claim 1, further comprising:

a second λ

/4 plate that is provided between the reflecting layer and the polarizing film.

3. The transparent screen according to claim 2,

wherein a slow axis of the first λ

/4 plate and a slow axis of the second λ

/4 plate are perpendicular to each other.

4. The transparent screen according to claim 1,

wherein the reflecting layer has a structure in which reflecting dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged, and

the reflecting dots are convex on the first λ

/4 plate side.

5. The transparent screen according to claim 3,

wherein the reflecting layer has a structure in which reflecting dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged, and

the reflecting dots are convex on the first λ

/4 plate side.

6. The transparent screen according to claim 1,

wherein the polarizing film has a structure in which a dichromatic colorant is homeotropically aligned.

7. The transparent screen according to claim 5,

wherein the polarizing film has a structure in which a dichromatic colorant is homeotropically aligned.

8. An image display system comprising:

the transparent screen according to claim 1; and

a short focal length projector that projects light from the first λ

/4 plate side to the transparent screen,

wherein light emitted from the short focal length projector is linearly polarized light.

9. An image display system comprising:

the transparent screen according to claim 7; and

a short focal length projector that projects light from the first λ

/4 plate side to the transparent screen,

wherein light emitted from the short focal length projector is linearly polarized light.