Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-01-16
1992-02-18
Zazworsky, John
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
340784, 359 86, G02F 113
Patent
active
050888064
ABSTRACT:
In a liquid crystal display, the optical transmission of the liquid crystal medium as a function of applied electric field varies with temperature. In order to ensure that the temperature of the liquid crystal medium can provide a practical response time, a heating element, along with a sensor element and a thermostat, establishes the temperature of the liquid crystal display in an appropriate range. The output signal of the sensor element is digitized and is used as a first portion of a memory unit address. A second portion of the memory unit address is provided by digitized command signals either from an operator or from the processing apparatus controlling the image of liquid crystal display. The logic signals stored at the location determined by the first and second address portions identify an electric field (applied voltage) that provides compensation for temperature and compensation for non-linear characteristics of the liquid crystal medium. The logic signals from the memory unit are converted into a voltage to be applied to the liquid crystal display.
REFERENCES:
patent: 4509043 (1985-04-01), Mossaides
patent: 4634225 (1987-01-01), Haim et al.
patent: 4890097 (1989-12-01), Yamashita et al.
patent: 4923285 (1990-05-01), Ogino et al.
patent: 4952032 (1990-08-01), Inoue et al.
McCartney Richard I.
Rupp John A.
Honeywell Inc.
Jepsen Dale E.
Lenkszus D. J.
Medved A.
Trice Ron
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