Folded variable birefringerence zeroth order hybrid aligned liquid crystal apparatus
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Jan 25, 1994
filing date -
Jan 25, 1994
priority date (Note) -
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Abstract
A reflective variable birefringence liquid crystal cell has an active matrix substrate, a birefringent material, a pair of surfaces containing the birefringent material therebetween, the birefringent material in proximity to the active matrix substrate having homeotropic alignment to eliminate the affect of varying cell thickness due to peaks and valleys in the surface of the active matrix substrate, the birefringent material in proximity to the other surface being switchable to provide relatively minimal optical phase retardation and increased optical phase retardation, the liquid crystal material may be preconditioned to assume a particular alignment to provide for a prescribed amount of retardation in one operational state of the cell.
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