Abstract
Liquid-crystal display (LCD) is a device utilizing the electrooptic property of aligned liquid-crystal (LC), and LC molecules are aligned homogeneously by the alignment film. The most of alignment film now in use industrially is polyimide (PI) thin film which should be rubbed. The required properties for alignment film vary with the types of LCD, however the most important is to give LC molecules planer alignment and suitable pretilt angle. The planer alignment property is supported to be related with the strain of thin film surface by rubbing, and pretilt angle is supported to be related with the physical and chemical properties of thin film surface. The control of surface tension and moleculer structure of thin film surface can be achieved by several moleculer designs of PI, and, by use of these PI for alignment film, the control of pretilt angle can be achieved. This method is very important for the commercial production of STN-mode LCD.
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