Supertwist LCD technology

The supertwist technology dominates the dot matrix liquid crystal display´s (LCD) market, replacing the more common twisted nematic technology. In order to optimise the performance of a supertwist display for a particular application, computer modelling is used to predict the transmission spectra of the display in the `on´ and `off´ states. This information can then be used to determine the chromaticity coordinates, contrast ratio and luminescence of the display. The development of supertwist LCDs has been extremely rapid. This fast pace is likely to be maintained with the introduction of coloured (RGB) supertwist displays and the use of very thin cells with spacings in the range of 2-3 μm. The use of supertwist displays is limited to alphagraphic displays because of their somewhat long response times and their limited greyscale capability