We studied the electro-optical response of a bistable cholesteric texture (BCT) display to ac voltage pulses. The material can be driven into states where planar and focal conic textures coexist at zero field and gray scale memory is achieved. According to the properties of the BCT display we designed two drive schemes; one for binary operation and the other for gray scale operation. We made a 320×320 pixel reflective display with a resolution of 80 lines/in. on a passive matrix. Measurement in an integration chamber showed that the display has higher contrast and better viewing angle than a reflective super twisted nematic display.

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A method for the colorimetric characterization of colour matrix CCD sensors has been developed. This method is based on measuring the spectral responses of the sensor with on-chip colour filters and then simulating the processes that take place in a camera. Optimizing the simulated processes enables each sensor to be characterized by providing colorimetric fidelity parameters.

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