Patent ID: 11892627
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 11:
12. A projection image display member comprising, in the following order:
at least one phase difference layer;
two or more of selective reflection layers; and
at least one polarization conversion layer,
wherein the polarization conversion layer is a layer in which a helical alignment structure of a liquid crystal compound is fixed,
the number of pitches x of the helical alignment structure and a film thickness y (unit of μm) of the polarization conversion layer satisfy all of the following Relational Expressions,

0.3≤x≤7.0,  (i)

0.5≤y≤6.0,  (ii)

y≤0.7x+3.2,  (iii)

and

y≥0.7x−1.4,  (iv)

the number of pitches x of the helical alignment structure and the film thickness y (unit of μm) of the polarization conversion layer satisfy all of the following Relational Expressions,

0.3≤x≤1.2,  (v)

1.0≤y≤3.0,  (vi)

and

y≥1.875x,  (vii)

the polarization conversion layer exhibits optical turning properties and birefringence with respect to visible light, and
the two or more of the selective reflection layers have selective reflection center wavelengths different from each other.