COLOUR LIQUID CRYSTAL DISPLAY DEVICE WITH ELECTRICALLY SWITCHABLE COLOUR FILTERS

摘要

A colour liquid crystal display device has an array of display pixels (10) for modulating input light and an array of associated colour filter elements (40) which comprise electro-optic filtering elements switchable electrically between a colour filtering state in which a required colour output is produced and a state in which they are substantially transparent to the input light. Such switching can be used beneficially, for example to reduce power consumption by sacrificing full colour output and allowing the brightness level of a back light to be decreased in view of the increased optical efficiency of the pixels when the filter elements are in their transparent state, or to improve viewability in the case of a reflective display used in poor ambient lighting.