Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1991-12-31
1993-10-19
Arnold, Bruce Y.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359263, 359315, 359318, G02F 103, G02F 129
Patent
active
052551180
ABSTRACT:
A technique for reducing interpixel crosstalk in an electrooptic total internal reflection light modulator image bar. A particular electrode length is selected to tailor a portion of the spatial frequency response of the image bar. The pixel size and quality resulting from a voltage difference between electrodes are determined primarily by the overall image bar spatial frequency response, and a set of preferred physical parameters can be determined by selecting parameter values to provide the desired spatial frequency response. It has been found that a desirable frequency response is one that approximates sin(.pi.Pf) for absolute values of f less than about 1/P, where f is the spatial frequency and P is the minimum pixel pitch. Further, it has been found that a particular electrode length provides the desired response for small absolute values of f. The particular electrode length is approximately E.sup.1/2 P/.gamma. where E is the ratio of the normal to tangential dielectric tensor components, P is the minimum pixel pitch, and .gamma. is the grazing angle. The desired cutoff in the frequency response for absolute values of f above about 1/P can be achieved by selecting appropriate values for other physical parameters.
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Arnold Bruce Y.
Lester Evelyn A.
Xerox Corporation
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