Patent
1988-03-09
1991-06-04
Miller, Stanley D.
350337, 40427, G02F 113, B44F 100
Patent
active
050208829
ABSTRACT:
In this invention, animation effects have been obtained in a device containing a light source illuminating a linear polarizer producing plane polarized light which is rotated in an electro-optical cell/cells such as a Liquid Crystal or PLZT cell. The angle of the plane is changed at the required speed by a voltage applied to the electrodes of the cell; this voltage being generated in an electronic circuit or obtained from the output of a transducer or manually. The rotated plane polarized light is shining through a stationary set of at least two linear polarizers oriented at different angles and then through a screen containing the art work. The emerging lighted image is perceived by the viewer as a change or as an animated movement of the art work. Color effects can also be obtained when a chromatic polarizer or a chromatic retardation plate is used. In the prior art, the change of the angle of the plane polarized light was achieved by mounting the linear polarizer on a mechanically rotated wheel. The introduction of electro-optical voltage controlled cells has many advantages such as speed of response, illumination of moving parts, feasibility of new effects, and flexibility of design. The applications of this invention are in advertising and exhibition displays, animated signage, animated printed material, instrument readout indicators and monitors, works of art, and in the field of toys and games.
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Schadt et al.-"Voltage Dependant Optical Activity of A TN Liquid Crystal" Applied Physics Letters-vol. 18-No. 4-Feb. 1971-pp. 127-128.
Duong Tai V.
Miller Stanley D.
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