Polarizer, method for manufacturing the same, optical film and image display
AssigneeNitto Denko Corporation
InventorsMariko Hirai, Takashi Kamijo, Minoru Miyatake
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Abstract
A polarizer of the present invention is composed of a film comprising a structure in which fine metallic particles is dispersed in a polymer matrix is characterized in that a polymer forming the polymer matrix is a translucent polymer having a transmittance of 88% or more when measured thereof with a thickness of 1 mm and the film is uniaxially stretched. The polarizer is good in heat resistance and transmittivity.
Claims22
A polarizer composed of a film comprising a structure in which fine metallic particles is dispersed in a polymer matrix,
- wherein a polymer forming the polymer matrix is a translucent polymer having a light transmittance of 88% or more when measured thereof with a thickness of 1 mm and the film is uniaxially stretched,
- a domain formed with fine metallic particles has an average particle diameter of 100 nm or less and an aspect ratio (a ratio of a maximum length/a minimum length) of less than 1.5,
- wherein the fine metallic particles are gold fine particles or silver fine particles and the translucent polymer has uniaxial birefringence due to uniaxial stretching;
- and
- the polarizer has an absorption spectrum with an absorption peak at a given wavelength, measured when polarized light incidences thereon,
- wherein if an azimuth of an incident polarization plane is altered relative to the polarizer, the absorption peak wavelength shifts in accordance with an alteration in the azimuth, in a case where an azimuth of the incident polarization plane relative to the polarizer is altered, if an azimuth of the incident polarization plane is 0 degree when an absorption peak wavelength of an absorption spectrum that is measured is the longest wavelength, which is referred to as λ1, by definition,
- if an azimuth of the polarization plane is gradually increased from 0 degree, a value of the absorption peak wavelength shifts to the short wavelength side in accordance with the increase,
- when an azimuth of the incident polarization plane is 90 degrees, a value of the absorption peak wavelength is the shortest wavelength, which is referred to as λ2, by definition, and satisfying a relation of(λ1−λ2)=10 to 50 nm.
A polarizer in which fine metallic particles is dispersed in a matrix formed with a liquid crystalline material, wherein a domain formed with fine metallic particles has an average particle diameter of 100 nm or less and an aspect ratio (a ratio of a maximum length/a minimum length) of or less than 1.5, wherein the fine metallic particles are gold fine particles or silver fine particles;
- and
- the polarizer has an absorption spectrum with an absorption peak at a given wavelength, measured when polarized light incidences thereon,
- wherein if an azimuth of an incident polarization plane is altered relative to the polarizer, the absorption peak wavelength shifts in accordance with an alteration in the azimuth, in a case where an azimuth of the incident polarization plane relative to the polarizer is altered, if an azimuth of the incident polarization plane is 0 degree when an absorption peak wavelength of an absorption spectrum that is measured is the longest wavelength, which is referred to as λ1, by definition,
- if an azimuth of the polarization plane is gradually increased from 0 degree, a value of the absorption peak wavelength shifts to the short wavelength side in accordance with the increase,
- when an azimuth of the incident polarization plane is 90 degrees, a value of the absorption peak wavelength is the shortest wavelength, which is referred to as λ2, by definition, and satisfying a relation of(λ1−λ2)=10 to 50 nm.
A polarizer composed of a film in which fine metallic particles is dispersed in a translucent polymer having a birefringence in the film plane,
- wherein a domain formed with fine metallic particles has an average particle diameter of 100 nm or less and an aspect ratio (a ratio of a maximum length/a minimum length) of less than 1.5,
- the polarizer has an absorption spectrum with an absorption peak at a given wavelength, measured when polarized light incidences thereon,
- wherein if an azimuth of an incident polarization plane is altered relative to the polarizer, the absorption peak wavelength shifts in accordance with an alteration in the azimuth, and
- wherein the fine metallic particles are gold fine particles or silver fine particles and the translucent polymer has uniaxial birefringence due to uniaxial stretching
- in a case where an azimuth of the incident polarization plane relative to the polarizer is altered, if an azimuth of the incident polarization plane is 0 degree when an absorption peak wavelength of an absorption spectrum that is measured is the longest wavelength, which is referred to as λ1, by definition,
- if an azimuth of the polarization plane is gradually increased from 0 degree, a value of the absorption peak wavelength shifts to the short wavelength side in accordance with the increase
- when an azimuth of the incident polarization plane is 90 degrees, a value of the absorption peak wavelength is the shortest wavelength, which is referred to as λ2, by definition, and satisfying a relation of(λ1−λ2)=10 to 50 nm.
Dependencies are inferred from the claim text.