| 摘要 |
PURPOSE:To prevent coloring phenomenon by using a specified polymer for a transparent film having the polymer oriented in a specified direction and exhibiting birefringence, and forming this film between a linearly polarizing plate on one side and a TN crystal layer. CONSTITUTION:A TN liquid crystal layer 4 is sandwiched with two linearly polarizing plates 6, 7 each having a polarizing axis crossing each other at right angles, and a transparent film 7 having a polymer oriented in a specified direction and exhibiting optical birefringence and erasing coloring display phenomenon is inserted between one of the plates 6, 7 and the layer 4. Polycarbonate, a copolymer of tetrafluoroethylene and hexafluoroethylene, or polyfluoroethylene propylene ether is used for the material of this film 7. The rotation angle of this film 7 is controlled so as to maximize the erasion effect of said phenomenon. As a result, the coloring phenomenon remarkably occurring especially in a large- sized cell can be easily erased, an off-grade rate in manufacture can be lowered, further, occurrence of elliptic polarization can be reduced, and contrast can be enhanced. |
