Electrostatic video display drive circuitry and displays incorporating same
AssigneeDisplay Science, Inc.
InventorCharles G. Kalt
Life of this patent
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Abstract
Disclosed are cross-talk resistant drive circuitry for electrostatic video displays and flexible, foldable and shaped embodiments of such displays including books, fanfolds and scrolls employing flexible polymer film construction. Transitorless drive circuitry uses row and column dumping capacitors to charge electrostatic pixels in a traveling group to avoid simultaneously charging row-adjacent pixels. Also, individual pixels can be shielded each with their own Faraday cage to control charge leakage from the pixel. The pixels' have spiral rollout shutters whose time parameters can be controlled by the use of suitable bleed resistors. Low-cost film technology manufacturing methods are also described.
Claims16
An electrostatic video display comprising a raster of rows of capacitively driven light-modulating pixels having distinct logical pixel addresses, and drive circuitry to provide charging pulses to specified pixels according to an intended display image, the drive circuitry providing an image refresh cycle and generating a traveling scan in which a pixel-charging activation pulse is applied to all specified ones of a horizontally contiguous pixel group, wherein the pixel group moves progressively from row to row across the raster to visit every pixel address during each refresh cycle, the number of pixels in the group being less than the number of pixels in a row so that specified row-adjacent pixels receive charging pulses at different times whereby cross-talk is inhibited.
Dependencies are inferred from the claim text.