Switchable holographic apparatus
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Jan 20, 1995
filing date -
Jan 21, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switchable holographic device which includes a first polarizer having a spatially varying direction of polarization. The device also includes a liquid crystal device arranged to act as a controllable phase plate, the liquid crystal device having a predetermined phase shift in one state and substantially no birefringent activity in another state. The liquid crystal device is thus controllable to selectively alter the polarization of at least some of the radiation passing therethrough or to have substantially no optical activity. An output polarizer receives the radiation from the liquid crystal device so that, depending on the state of the liquid crystal device, the hologram is replayed or not replayed.
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