Patent
1978-02-13
1980-12-23
Bauer, Edward S.
350349, 350339D, G02F 1133
Patent
active
042407117
ABSTRACT:
A display device having a liquid crystal cell containing a medium, which can be switched zone-wise between at least two different optical states to form a light valve, a light trap in the form of a plate-shaped body disposed behind the liquid crystal cell when taken in a direction of observation of the device, the plate-shaped body having a material with an index of refraction greater than 1, containing fluorescent particles, and possessing a light emergent or outlet window at the rear of each switchable zone of the liquid crystal cell characterized by the light emergent or outlet windows comprising a groove in the plate and a light scattering surface disposed between the groove and the medium of the liquid crystal cell. Preferably, the grooves of each of the windows is disposed in a rear surface or side of the fluorescent plate and the scattering surface is arranged on a front surface of the plate and can either be formed by a pigment layer which has been silk screened on the front surface or a rough surface zone which has been embossed on the front surface.
REFERENCES:
patent: 3551026 (1970-12-01), Heilmeier
patent: 4017155 (1977-04-01), Yagi et al.
patent: 4043636 (1977-08-01), Eberhardt et al.
patent: 4088992 (1978-05-01), Kmetz et al.
patent: 4142781 (1979-03-01), Baur et al.
Baur Gunter
Greubel Waldemar
Kruger Hans
Schauer Alois
Bauer Edward S.
Siemens Aktiengesellschaft
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