| 摘要 |
PURPOSE: 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. CONSTITUTION: 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° 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. |
