Determination of the switching response in reflective twisted nematic liquid crystal displays

In general, deducing the switching time of twisted nematic liquid crystal displays by only using the optical response curves is difficult unless the cell's parameters are optimized. The difficulty is increased in the case of reflective displays which are asymmetric and then exhibit fluctuations in their optical response when driven with an AC voltage. A new method is proposed to determine the dynamic response optically, independent of the shape of the reflectance-time curve. The experimentally found values for different cell gaps and driving voltages are in good agreement with theoretical expectations.