Birefringent film, process for producing the same, retardation film, elliptically polarizing plate, and liquid crystal display

Abstract

Abstract A birefringent film in which molecules oriented in a direction parallel to the film plane and molecules oriented in the direction of the thickness of the film are present in a mixed state; a process for producing the birefringent film, which comprises laminating a resin film on one or both sides thereof with a shrinkable film, thereby preparing a laminate, and then heat stretching the laminate, thereby performing stretching treatment of the resin film while imparting to the resin film the ability to shrink in the direction crossing the stretching direction; a retardation film which uses at least one birefringent film and has refractive indexes, n x and n y , in two directions parallel to the plate plane and crossing each other at right angles and a refractive index, n z , in the direction of the thickness of the plate, said refractive indexes n x , n y , and n z satisfying the following equation: 0 < (n x -n z )/(n x -n y ) < 1 provided that n x >n y ; an elliptically polarizing plate comprising a laminate of the retardation film with a polarizing plate; and a liquid crystal display comprising a liquid crystal cell and a polarizing plate disposed at least on one side of said liquid crystal cell through the retardation film.

Inventors

• 👤 Hiroyuki c/o NITTON DENKO CORPORATION Yoshimi
• 👤 Tatsuki c/o NITTON DENKO CORPORATION Nagatsuka
• 👤 Yasuo c/o NITTON DENKO CORPORATION Fujimura
• 👤 Tatsuya c/o NITTON DENKO CORPORATION Osuga

Bibliographic Details