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US 10,295,714 B2Granted
Elongated circularly polarizing plate, elongated broadband lambda/4 plate, organic electroluminescent display device, and liquid crystal display device
AssigneeZeon Corporation
InventorKazuhiro Oosato
Life of this patent
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Abstract
A long-length circularly polarizing plate including: a polarizing film; a λ/2 plate having a slow axis in a direction forming an angle of 22.5°±10° relative to an absorption axis of the polarizing film; and a plate having a slow axis in a direction forming an angle of 90°±20° relative to an absorption axis of the polarizing film, in this order, wherein the λ/2 plate and the λ/4 plate have different wavelength dispersions, and an NZ factor of the λ/4 plate NZq satisfies NZq≤0.0.
Claims13
A long-length circularly polarizing plate comprising:
- a polarizing film;
- a λ/2 plate having a slow axis in a direction forming an angle of 22.5°±10° relative to an absorption axis of the polarizing film;
- and a λ/4 plate having a slow axis in a direction forming an angle of 90°±20° relative to an absorption axis of the polarizing film, in this order, wherein
- the λ/2 plate and the λ/4 plate have different wavelength dispersions, and
- an NZ factor of the λ/4 plate represented by NZq satisfies NZq≤0.0, wherein
- the NZ factor is a value represented by (nx−nz)/(nx−ny), where nx represents a refractive index in a direction in which the maximum refractive index is given among directions perpendicular to the thickness direction (in-plane directions), ny represents a refractive index in one of the in-plane directions that is orthogonal to the nx direction, and nz represents a refractive index in a thickness direction.
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A long-length broadband λ/4 plate comprising:
- a λ/2 plate having a slow axis in a direction forming an angle of 22.5°±10° relative to a lengthwise direction of the broadband λ/4 plate;
- and
- a λ/4 plate having a slow axis in a direction forming an angle of 90°±20° relative to the lengthwise direction of the broadband λ/4 plate, wherein
- the λ/2 plate and the λ/4 plate have different wavelength dispersions, and
- an NZ factor of the λ/4 plate represented by NZq satisfies NZq≤0.0, wherein
- the NZ factor is a value represented by (nx−nz)/(nx−ny), where nx represents a refractive index in a direction in which the maximum refractive index is given among directions perpendicular to the thickness direction (in-plane directions), ny represents a refractive index in one of the in-plane directions that is orthogonal to the nx direction, and nz represents a refractive index in a thickness direction.
3 more elements
Dependencies are inferred from the claim text.