Polarizing plate, liquid crystal panel using same, and photofabrication apparatus
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsYoshitaka Takeichi, Masaharu Hashizume, Komei Narita, Kouichi Tanaka
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Abstract
Provided is a polarizing plate that is for use in a liquid crystal shutter of a photofabrication apparatus, said polarizing plate including an absorption-type polarizer in which a dichroic dye is oriented, the absorption-type polarizer having a maximum absorption wavelength in the wavelength range of 370-470 nm, and the polarizing plate having a weighted parallel transmittance Xp380-440 of not less than 20% and a weighted orthogonal transmittance Xc380-440 of 0.0001-0.1%.
Claims16
A polarizing plate for use in a liquid crystal shutter of a photofabrication apparatus,
- wherein the polarizing plate comprises an absorption-type polarizer in which a dichroic colorant is oriented,
- the absorption-type polarizer has a maximum absorption wavelength in a wavelength range of 370 to 470 nm, and
- the polarizing plate has an Xp380-440 of 20% or more as determined by Expression (1), and an Xc380-440 of 0.0001 to 0.1% as determined by Expression (2):
- [
- Expression
-
- 1
- ]
-
- X
- P
-
- 380
- -
- 440
- =
- ∫
- 380
- 440
- Tp
-
- (
- λ
- )
-
- S
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 380
- 440
- S
-
- (
- λ
- )
-
- d
-
- λ
- ×
- 100
- (
- 1
- )
- [
- Expression
-
- 2
- ]
-
- X
- C
-
- 380
- -
- 440
- =
- ∫
- 380
- 440
- Tc
-
- (
- λ
- )
-
- S
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 380
- 440
- S
-
- (
- λ
- )
-
- d
-
- λ
- ×
- 100
- (
- 2
- )
- wherein Xp380-440 is the weighted parallel transmittance calculated in a wavelength range of 380 nm to 440 nm;
- Xc380-440 is a weighted cross transmittance calculated in a wavelength range of 380 nm to 440 nm;
- Tp(λ) is a parallel transmittance of the polarizing plate at each wavelength;
- Tc(λ) is a cross transmittance of the polarizing plate at each wavelength;
- and S(λ) is a light source illuminance normalized at the maximum illuminance.
A polarizing plate for use in an optical path between a liquid crystal panel of a photofabrication apparatus and a light source,
- wherein the polarizing plate comprises an absorption-type polarizer in which a dichroic colorant is oriented,
- the absorption-type polarizer has a maximum absorption wavelength in a wavelength range of 370 to 470 nm;
- and
- the polarizing plate has an Xp380-440 of 30 to 70% as determined by Expression (1), and an Xc380-440 of 0.1 to 65% as determined by Expression (2):
- [
- Expression
-
- 3
- ]
-
- X
- P
-
- 380
- -
- 440
- =
- ∫
- 380
- 440
- Tp
-
- (
- λ
- )
-
- S
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 380
- 440
- S
-
- (
- λ
- )
-
- d
-
- λ
- ×
- 100
- (
- 1
- )
- [
- Expression
-
- 4
- ]
-
- X
- C
-
- 380
- -
- 440
- =
- ∫
- 380
- 440
- Tc
-
- (
- λ
- )
-
- S
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 380
- 440
- S
-
- (
- λ
- )
-
- d
-
- λ
- ×
- 100
- (
- 2
- )
- wherein Xp380-440 is a weighted parallel transmittance calculated in a wavelength range of 380 nm to 440 nm;
- Xc380-440 is a weighted cross transmittance calculated in a wavelength range of 380 nm to 440 nm;
- Tp(λ) is a parallel transmittance of the polarizing plate at each wavelength;
- Tc(λ) is a cross transmittance of the polarizing plate at each wavelength;
- and S(λ) is a light source illuminance normalized at the maximum illuminance.
Dependencies are inferred from the claim text.