A color sequential projection system has some distinct advantages over conventional systems which make it uniquely suitable for consumer TV as well as high performance professional applications such as computer monitors and electronic cinema. A fast responding light-valve is, clearly, essential for a good performing system. Response speed of transmissive LC lightvalves has been marginal thus far for good color rendition. Recently, Sevchenko Institute has made some very fast reflective LC cells which were evaluated at Philips Labs. These devices showed sub millisecond-large signal-response times, even at room temperature, and produced good color in a projector emulation testbed. In our presentation we describe our highly efficient color sequential projector and demonstrate its operation on video tape. Next we discuss light-valve requirements and reflective light-valve test results.
A brief introduction to Philips' color sequential projection display is given. Picture quality in a conventional three light valve display is only slightly degraded by the electrical anisotropy of the liquid crystal (LC) material as only the changing parts of the image are affected. This is not true for a color sequential display where the static parts are also affected since the LC material is in a continuous state of change. We show how a feedforward correction scheme works, why it converges and how the convergence is linked to the LC's physical properties.
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