Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-02-16
1986-01-21
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358209, 358213, 358236, 350362, H04N 1300
Patent
active
045660310
ABSTRACT:
A spatial light modulator with application to holography utilizes two planar transparent supports between which is positioned an electro-optical dipolar medium which is normally opaque but light transmissive in the presence of an applied electric field. Orthogonally disposed arrays of transparent electrodes are supported from the transparent supports and are arranged to be sequentially scanned in sampling fashion to define a sequence of uniform electric fields forming apertures of predetermined diameter. For holographic applications, one of the surfaces of the supports receives the interference pattern generated by the reference and object illumination emanating from a coherent source and the opposite support is operatively associated with a photodetecting arrangement. Through the generation of scanning synchronization signals and data signals from the photodetectors, an electronic representation of holographic data is achieved. To avoid "cross-talk" phenomena and segmented aperture definition, the assemblage includes metallic layers adjacent each of the electrode arrays having openings therein at matrix locations where the oppositely disposed electrodes cross. The metallic layers are mutually electrically coupled and serve to dissipate otherwise laterally extending field flux regions. To reconstruct these data, the same form of support and normally opaque dipolar medium is employed in conjunction with a control scanning arrangement wherein electrical fields corresponding with interference pattern intensity are provided. This arrangement may be utilized in conjunction with a reference beam of coherent light to derive a virtual image corresponding with the initially constructed holographic data. To achieve an adequate dwell interval for the reconstructed hologram for each displaced field, a latching transparent electrode layer is provided adjacent each array which is energized to produce a field therebetween having a strength below that required to initially induce a transparent condition but sufficient to maintain such condition for any pre-existing aperture. Frame rates are enhanced through register application of data signals to one entire array of electrodes while providing application to a single electrode of the oppositely disposed array.
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Britton Howard W.
Kostak Victor R.
The Holotronics Corporation
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