| 摘要 |
PROBLEM TO BE SOLVED: To obtain a circularly polarizing plate with a pair of rightward and leftward polarizing plates which can produce a preferable black state by superposing rightward and leftward circularly polarized light, and to obtain a liquid crystal display device having high contrast. SOLUTION: The circularly polarizing plate consists of a pair of leftward and rightward circularly polarizing plates each having an equal number of birefringent layers. Each circularly polarizing plate has one or more layers of half-wave layers between a polarizing plate and a quarter-wave layer with the optical axes of the half-wave layers crossing the axis of the quarter-wave layer. The birefringent layers in total generate quarter wavelength phase difference in the whole or a part of a 200 to 1000 nm wavelength region. When the pair of circularly polarizing plates are disposed with the polarizing plates outside, the first, second to n-th layers of the birefringent layers from the nearest side to the polarizing plate are arranged in such a manner that the fast phase axes of the first layers, second layers, and n-th layers, and the transmission axes of the polarizing plates tape 80 to 100 deg. cross angles. The liquid crystal display device is obtained by separately disposing the pair of circularly polarizing plates in the above state on both sides of a liquid crystal cell. |
