CIRCULARLY POLARIZING PLATE
First Claim
1. A circularly polarizing plate comprising a base film, a phase difference layer on the base film, and a polarizer on the phase difference layer,wherein the base film comprises an acrylic resin and a styrene-based resin,the base film has a planar phase difference value of 5 nm or less in Equation 1 below and a thickness direction phase difference value of more than 0 nm in Equation 2 below, andthe phase difference layer has ultraviolet absorptivity such that transmittance for light having a wavelength of 385 nm is 3% or less:
-
Rin=d×
(nx−
ny),
[Equation 1]
Rth=d×
(nz−
ny),
[Equation 2]wherein, Rin is the planar phase difference, Rth is the thickness direction phase difference, nx, ny and nz are the refractive indexes of the base film in the slow axis direction, in the fast axis direction and in the thickness direction, respectively, and d is the thickness of the base film.
1 Assignment
0 Petitions
Accused Products
Abstract
The present application relates to a circularly polarizing plate and a use thereof. The present application can provide a circularly polarizing plate, which can be applied to a display device such as an organic light emitting display device to minimize blocking of light in the visible light region affecting image quality while blocking harmful ultraviolet rays appropriately and also has excellent durability. In addition, the present application can provide a circularly polarizing plate having excellent compensation characteristics at a viewing angle while ensuring process simplification and cost competitiveness.
-
Citations
20 Claims
-
1. A circularly polarizing plate comprising a base film, a phase difference layer on the base film, and a polarizer on the phase difference layer,
wherein the base film comprises an acrylic resin and a styrene-based resin, the base film has a planar phase difference value of 5 nm or less in Equation 1 below and a thickness direction phase difference value of more than 0 nm in Equation 2 below, and the phase difference layer has ultraviolet absorptivity such that transmittance for light having a wavelength of 385 nm is 3% or less: -
Rin=d×
(nx−
ny),
[Equation 1]
Rth=d×
(nz−
ny),
[Equation 2]wherein, Rin is the planar phase difference, Rth is the thickness direction phase difference, nx, ny and nz are the refractive indexes of the base film in the slow axis direction, in the fast axis direction and in the thickness direction, respectively, and d is the thickness of the base film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification