1979-03-20
1981-07-07
Anderson, Bruce C.
350340, G02F 113
Patent
active
042771447
ABSTRACT:
Electro-optic passive display cell constituted by a layer of a mixture of a nematic liquid crystal having a positive dielectric anisotropy, an optically active compound and dichroic molecules. The inner faces of the plates of the cell are covered with alignment layers such that, in the area situated outside the display zones or segments, the layer of the mixture has a homeotropic structure in its whole thickness. Opposite the segments the cell is arranged in such a way that the layer of the mixture has a helicoidal structure so that incident light is absorbed in these zones when the segments are not activated and that the layer of the mixture is orientated according to a homeotropic structure under the action of an electric field. Thus, when the cell is at rest, all its segments are visible. The display is effected by "cancelling" or "effacing" the segments which must not appear, so that only the non activated segments remaining visible in dark on a clear or transparent background.
REFERENCES:
patent: 3833287 (1974-09-01), Taylor et al.
patent: 3865469 (1975-02-01), Asai et al.
patent: 4112157 (1978-09-01), Krueger et al.
Gharadjedaghi Fereydoun
Laesser Claude
Ruedin Yves
Saurer Eric
Viennet Rene
Anderson Bruce C.
Ebauches S.A.
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