1980-12-03
1984-01-03
Punter, William H.
350338, G02F 113
Patent
active
044239289
ABSTRACT:
The display device comprises a cell having two levels, between two polarizers 1 and 7, the directions of polarization of which are at an angle of 120.degree. to each other. The two-level cell comprises two liquid crystal layers 5 and 6, each of which, in the rest condition, causes rotation of the plane of polarization of the light through 60.degree.. The orientation of the molecules of the input surface of the first layer 5 is parallel to the direction of polarization P1 of the first polarizer 1. The orientation of the molecules of the input surface of the second layer 6 is parallel to the orientation of the molecules on the output face of the first layer 5. The orientation of the molecules of the output surface of the second layer 6 is parallel to the direction of polarization P2 of the second polarizer 7.
This construction provides a two-level cell which is clear if the two liquid crystal layers are both in the rest condition, and which is dark in all other situations, whether one or the other or both layers 5, 6 are energized.
REFERENCES:
patent: 3903519 (1975-09-01), Zega
patent: 4054368 (1977-10-01), Krueger et al.
patent: 4099855 (1978-07-01), Wisbey et al.
patent: 4231639 (1980-11-01), Banda
patent: 4240709 (1980-12-01), Ho/ rnell
Scheffer et al., "Optimum Polarizer Combinations for Twisted Nematic Displays" Conf. Paper, pp. 53-60.
Goscianski, M., "Optical Characteristics of Twisted Nematic Liquid Crystals Application to the Improvement of the Scanning Capability in Matrix Displays", Jr. of App. Physics, 4-1977, pp. 1426-1431.
Dir, G. A. "Varible Neutral Density Device", Xerox Disc. Jr. 6-1976, pp. 79-80.
Ebauches S.A.
Punter William H.
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