Circular polarizing plate and bendable display device
There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus.
1. A circularly polarizing plate to be used in a bendable display apparatus, comprising:
a polarizer; and
a retardation film arranged on one side of the polarizer, the retardation film being formed of a single resin film,
wherein in-plane retardations at 450 nm, 550 nm, and 650 nm of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650),
wherein a ratio of Re(450) to Re(550) is 0.8 or more and less than 1.0,
wherein a ratio of Re(550) to Re(650) is 0.8 or more and less than 1.0,
wherein a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus,
wherein the retardation film is a stretched film, and
wherein the display apparatus is an organic electroluminescence display apparatus.
2. The circularly polarizing plate according to claim 1 , wherein at least part of the display apparatus is bent with a radius of curvature of 10 mm or less.
3. The circularly polarizing plate according to claim 1 , wherein an absolute value of a photoelastic coefficient of the retardation film is 2×10 −12 (m 2 /N) or more.
4. The circularly polarizing plate according to claim 1 , further comprising another retardation film arranged on another side of the polarizer.
5. A bendable display apparatus, comprising the circularly polarizing plate of claim 1 .
6. The circularly polarizing plate according to claim 1 , wherein the single resin film is composed of at least one resin selected from the group consisting of a polycarbonate resin, a polyvinyl acetal resin, a cycloolefin-based resin, an acrylic resin, and a cellulose ester-based resin.
7. The circularly polarizing plate according to claim 1 , wherein the retardation film has a thickness of from 20 μm to 100 μm.