Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1971-05-03
1978-09-26
Bauer, Edward S.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340324M, G02F 113
Patent
active
041165438
ABSTRACT:
A system of selectively controlling the light scattering areas or sites of nematic liquid crystal display devices of the type including a thin layer of the liquid crystal with conductors on opposite sides thereof, preferably transparent conductors, is described. The device is subjected to a frequency substantially above the critical frequency to maintain it in a non-light scattering state even in the presence of a voltage tending to render it light scattering. The particular sites to be rendered light scattering are selected by removing the high frequency voltage at those sites coincidentally with the application of a turn-on voltage to the same site. The circuit provides for a display of data which is utilized to control either the application of the turn-on voltage or the removal of the high frequency or hold-off voltage. The application of the other voltage to different cells or different conductors of the same cell is controlled sequentially and repetitively at a rate greater than that corresponding to the refresh time of the liquid crystal material.
REFERENCES:
patent: 3322485 (1967-05-01), Williams
patent: 3499112 (1970-03-01), Heilmeier et al.
patent: 3575492 (1971-04-01), Nester et al.
patent: 3653745 (1972-04-01), Mao
patent: 3654606 (1972-04-01), Marlowe et al.
R. A. Soref, Solid Facts About Liquid Crystals, Laser Focus, Sep. 1970, vol. 6, #9, pp. 45-49.
Bauer Edward S.
Cohen Joseph T.
General Electric Company
Krauss Geoffrey H.
Snyder Marvin
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