Liquid crystal focusing screen having different groups of electr

Details Liquid crystal focusing screen having different groups of electr Liquid crystal focusing screen having different groups of electr

1987-07-27

1989-01-03

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350336, 340793, G02F 1133, G09G 300

Patent

active

047952385

ABSTRACT:
A focusing screen for observing an image formed by an objective lens is constructed of a liquid crystal layer, having a dynamic scattering effect, sandwiched between a pair of parallel transparent electrodes. At least one of the transparent electrodes is divided into a plurality of discrete parts. The discrete electrode parts are connected as independent groups through a switch mechanism to a driving circuit. The switch mechanism permits one or more of the groups to act as different elements in response to an applied voltage, depending on the F value of the lens. Accordingly, the scattering degree of the focusing screen varies as a function of the F value and not the applied voltage.

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Kowel et al., I "A Liquid Crystal Adaptive Lens" in Proceedings, NASA Conference on Optical Information Proceeding for Aerospace Applications, VA, (1981).
Kowel et al., II "Focusing by Electrical Modulation in a Liquid Crystal Cell" Applied Optics Jan. 15, 1984.
Soref "Field Effects in Nematic Liquid Crystals Obtained with Interdigital Electrodes" Journal of Applied Physics, vol. 45, No. 12, Dec. 1974.
Stucki "Optimal Digital Halftone Pattern Generation Method" IBM Tech. Disc., vol. 17, No. 9, Feb. 1975, pp. 2779-2780.

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