Liquid crystal on silicon (LCoS or LCOS) is a "micro-projection" or "micro-display" technology typically applied in projection televisions. It is a reflective technology similar to DLP projectors; however, it uses liquid crystals instead of individual mirrors. By way of comparison, LCD projectors use transmissive LCD chips, allowing light to pass through the liquid crystal. In LCoS, liquid crystals are applied directly to the surface of a silicon chip coated with an aluminized layer, with some type of passivation layer, which is highly reflective.
LCoS technology can typically produce higher resolution and higher contrast images than standard liquid crystal display and plasma display technologies, which makes it less expensive to implement in such devices as televisions.
Read more about Liquid Crystal On Silicon: History and Implementations, Display System Architectures
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