TRANSPARENT SCREEN AND IMAGE DISPLAY SYSTEM

• US 20190064411A1
• Filed: 10/24/2018
• Published: 02/28/2019
• Est. Priority Date: 04/25/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: YANAI, Yujiro, YAMAMOTO, Akira, NAGAI, Michio
• Granted Patent: US 10,663,827 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• 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: G02F 1/13 based on liquid crystals, e.g. single liquid crystal display cells
• CPC Class Codes: G02F 1/133543 Cholesteric polarisers
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G02F 1/13756 the liquid crystal selectively assuming a light-scattering state G02F1/1334, G02F1/13718 take precedence
• CPC Class Codes: G02F 2201/343 cholesteric liquid crystal reflector
• CPC Class Codes: G02F 2203/05 wavelength dependent
• CPC Class Codes: G03B 21/604 Polarised screens
• CPC Class Codes: G03B 21/62 Translucent screens
• CPC Class Codes: G09G 2300/0486 Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04N 9/31 Projection devices for colour picture display , e.g. using electronic spatial light modulators [ESLM]

Abstract

An object is to provide: 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 object is achieved by the transparent screen including: a dot array in which dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged; and a layer that is obtained by immobilizing a cholesteric liquid crystalline phase.

Claims

1. A transparent screen comprising:

a dot array in which dots obtained by immobilizing a cholesteric liquid crystalline phase are two-dimensionally arranged; and

a layer that is obtained by immobilizing a cholesteric liquid crystalline phase.

2. The transparent screen according to claim 1,

wherein a selective reflection wavelength of the dots is equal to a selective reflection wavelength of the layer.

3. The transparent screen according to claim 1,

wherein a rotation direction of circularly polarized light reflected from the dots is the same as a rotation direction of circularly polarized light reflected from the layer.

4. The transparent screen according to claim 1,

wherein a plurality of the dot arrays are provided,

selective reflection wavelengths of the dot arrays are different from each other,

a plurality of the layers are provided, and

selective reflection wavelengths of the layers are different from each other.

5. The transparent screen according to claim 4,

wherein the dot arrays include a dot array that reflects red light, a dot array that reflects green light, and a dot array that reflects blue light, and

the layers include a layer that reflects red light, a layer that reflects green light, and a layer that reflects blue light.

6. The transparent screen according to claim 1,

wherein the dot arrays include a dot array that reflects right circularly polarized light and a dot array that reflects left circularly polarized light, and

the layers include a layer that reflects right circularly polarized light and a layer that reflects left circularly polarized light.

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

a λ

/4 plate.

8. An image display system comprising:

the transparent screen according to claim 1; and

a projector of which outgoing light is unpolarized light.

9. An image display system comprising:

the transparent screen according to claim 7; and

a projector of which outgoing light is linearly polarized light.

10. The image display system according to claim 8,

wherein the dot array is positioned between the layer and the projector, and in the dot array, convex portions of the dots face the projector.