Light control systems with a circular polarizer and a twisted nematic liquid crystal having a minimum path difference of .lambda./2
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United States of America Patent
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Jun 7, 1994
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N/A
app pub date -
Jun 20, 1991
filing date -
Nov 1, 1989
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Abstract
A new mode of operation is proposed for light control systems consisting of a combination of liquid crystal cells and polarizers. The direct operation of liquid crystal cells with circularly-polarized light is advantageous in many respects. The circularly-polarized light is produced either with conventional circular polarizers or with monomeric or polymeric cholesteric liquid crystals. The new mode of operation is possible under certain conditions for all liquid crystal cells which hitherto had to be operated with linearly-polarized light.
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