Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-12-07
1994-03-22
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359102, G02F 1133, G02F 1135
Patent
active
052969550
ABSTRACT:
A liquid crystal display apparatus has a lamination structure in which an upper polarizer, a phase difference plate, a supertwisted nematic liquid crystal cell sandwiched between upper and lower substrates, a lower polarizer, and a reflection plate are stacked in this sequence. In order to obtain an achromatic display which is stable against the temperature change, the retardation Re of the phase difference plate is set to 555 to 580 nm, the product d.multidot..DELTA.n of the liquid crystal cell thickness and the refractive anisotropy of the liquid crystal display element is set to 0.76.+-.0.02, the angle .alpha. formed by the liquid crystal molecular orientation axis of the upper substrate and the upper polarizer is set to 55 to 65 deg., the angle .beta. formed by the liquid crystal molecular orientation axis of the lower substrate and the lower polarizer is set to 40 to 50 deg., the angle .theta. formed by the liquid crystal molecular orientation axis of the upper substrate and the optical axis of the phase difference plate is set to 120 to 130 deg., and the twisting angle of the liquid crystal molecule is set to 240 deg.
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Yamamoto et al "Optimization of a Single-Cell Black & White ST LCD Using a Retardation Film" Japan Display '89-1989-pp. 332-334.
Duong Tai V.
Sharp Kabushiki Kaisha
Sikes William L.
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