Optics: image projectors – Miscellaneous
Patent
1990-12-10
1993-02-16
Haroian, Harry N.
Optics: image projectors
Miscellaneous
353 27, 353DIG3, 353 20, 353 69, G03B 2100
Patent
active
051875101
ABSTRACT:
Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector. When operating in conjunction with an overhead projector, a preferred embodiment of the present invention is powered by light energy from the overhead projector and in a further preferred embodiment is controlled through the use of infrared or other non-visible electromagnetic communication.
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Vogeley Arthur W.
Vogeley James H.
Haroian Harry N.
n-View Corporation
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