Configuration and Operation Principles of Twisted Nematic Displays

1 Configuration and Operation Principles of Twisted Nematic Displays [Pg.200]

The configuration and the operation principle of a twisted nematic (TN) cell are shown in Fig. 1. [Pg.200]

The cell consists of two transparent glass plates coated with thin layers of indium-tin-oxide (ITO) and polyimide on their inner surfaces. The polyimide layer is unidi-rectionally rubbed to achieve a macroscopic orientation of the liquid crystal director. The two glass plates are held apart at a distance 6-10 p,m by spacers with the rubbing directions of the polyimide layers perpendicular to each other. Owing to the boundary conditions a nematic liquid crystal will become orientated parallel to the rubbing direction of each glass plate and consequently the director will undergo a twist of 90° [Pg.200]

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