Reflection member, projection screen, combiner, and heat shield member

Patent metadata

Field	Value
Publication number	US-2016377776-A1
Application number	US-201615260938-A
Country	US
Kind code	A1
Filing date	Sep 9, 2016
Priority date	Mar 20, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

Due to the present invention, a reflection member including two or more layers of fixed cholesteric liquid crystal phases, in which the two or more layers of fixed cholesteric liquid crystal phases exhibit central wavelengths of mutually different selective reflection, and the two or more layers of fixed cholesteric liquid crystal phases include a layer formed of a composition including a disc-like liquid crystal compound and a layer formed of a composition including a rod-like liquid crystal compound and a projected image display member and a heat shield member which include the reflection member are provided. The reflection member of the present invention has favorable selective reflection characteristics with respect to oblique incidence rays.

First claim

What is claimed is:

1 . A reflection member comprising:
two or more layers of fixed cholesteric liquid crystal phases, wherein the two or more layers of fixed cholesteric liquid crystal phases exhibit central wavelengths of mutually different selective reflection, and the two or more layers of fixed cholesteric liquid crystal phases include a layer formed of a composition including a disc-like liquid crystal compound and a layer formed of a composition including a rod-like liquid crystal compound.

2 . The reflection member according to claim 1 ,
wherein a difference in an absolute value of Rth at a wavelength of 550 nm between the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound is 100 nm or smaller.

3 . The reflection member according to claim 1 ,
wherein, out of the two or more layers of fixed cholesteric liquid crystal phases, two layers closest to any one surface side of the reflection member consist of the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound.

4 . The reflection member according to claim 1 which is a film for forming projected images using reflected light.

5 . The reflection member according to claim 3 which is a film for forming projected images using reflected light on the above-described surface side.

6 . The reflection member according to claim 1 , comprising:
a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a red wavelength range; a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a green wavelength range; and a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a blue wavelength range.

7 . The reflection member according to claim 5 , comprising:
a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a red wavelength range; a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a green wavelength range; and a layer of fixed cholesteric liquid crystal phase which has a central wavelength of selective reflection in a blue wavelength range.

8 . The reflection member according to claim 6 ,
wherein the red wavelength range is 600 nm to 650 nm, the green wavelength range is 500 nm to 600 nm, and the blue wavelength range is 430 nm to 480 nm.

9 . The reflection member according to claim 1 ,
wherein a haze value measured from any one surface is 2.0% or higher.

10 . A projection screen comprising:
the reflection member according to claim 9 .

11 . The projection screen according to claim 10 ,
wherein out of the two or more layers of fixed cholesteric liquid crystal phases, two layers closest to a surface on the projected image display side consist of the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound.

12 . A combiner for head up displays comprising:
the reflection member according to claim 1 .

13 . The combiner for head up displays according to claim 12 ,
wherein, out of the two or more layers of fixed cholesteric liquid crystal phases, two layers closest to a surface on the projected image display side consist of the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound.

14 . The combiner for head up displays according to claim 12 , comprising:
the two or more layers of fixed cholesteric liquid crystal phases and a base material in this order, and an antireflection layer(s) on any one or both surface(s).

15 . The combiner for head up displays according to claim 12 , comprising:
the base material; the two or more layers of fixed cholesteric liquid crystal phases; and an antireflection layer in this order, wherein an in-plane retardation in the base material at a wavelength of 550 nm is 50 nm or less.

16 . The combiner for head up displays according to claim 15 ,
wherein, out of the two or more layers of fixed cholesteric liquid crystal phases, two layers closest to a surface on the projected image display side consist of the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound.

17 . The combiner for head up displays according to claim 12 , comprising:
the two or more layers of fixed cholesteric liquid crystal phases; the base material; and an antireflection layer in this order.

18 . The combiner for head up displays according to claim 17 ,
wherein out of the two or more layers of fixed cholesteric liquid crystal phases, two layers closest to a surface on the projected image display side consist of the layer formed of a composition including a disc-like liquid crystal compound and the layer formed of a composition including a rod-like liquid crystal compound.

19 . A heat shield member comprising:
the reflection member according to claim 1 .

20 . The heat shield member according to claim 19 , comprising:
a ¼ wavelength phase difference plate.

Assignees

• Fujifilm Corp

Inventors

• Ichihashi Mitsuyoshi

Classifications

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02B2027/0112

  comprising device for genereting colour display · CPC title

• G02B2027/0194

  with combiner of laminated type, for optical or mechanical aspects · CPC title

• G02B5/3083

  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 title