Abstract
The effects of pretilt angle on electro-optical properties of optically compensated bend liquid crystal cells with a mixed polyimide alignment layer are investigated. By adjusting the mixed polyimide concentration, several kinds of alignment layers are produced, and a wide range of pretilt angles (2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> -66 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> ) are achieved. Differing from the conventional addresses, the maximum-light-transmittance voltage, obtained from the transmittance-voltage curve of the cell undergoing the reverse measurement, is employed, making a ~ 14% enhancement in the output transmittance. Compared to the 0-wt% cell, the 0.6-wt% cell with 16 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> pretilt angle achieves ~ 38% and ~ 50% improvement in the rising-time and falling-time response, respectively.
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