Field sensitive optical displays, generation of fields therefor and scanning thereof
AssigneeControl Interface Company Limited
InventorsWilliam Bohmer, Walter J. Betancourt, Louis S. Hoffman
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Abstract
Disclosed are field sensitive optical displays, and arrangements and methods for inducing fields in the displays and for scanning the displays. In the disclosed embodiments, liquid crystal, optoceramic and electroluminescent materials are utilized. Methods and arrangements for improving the response time of twisted nematic liquid crystal material and for generating color displays are also disclosed. Methods and arrangements are also disclosed for superimposing varying and a dc fields in field sensitive material. Various display patterns such as a movable dot, intersecting lines and a pivoting line can be obtained.
Claims25
A field sensitive display device for forming a display when subjected to visible light comprising a field sensitive material, spaced electrodes for inducing a field, means for containing the field sensitive material with the spaced electrodes and the field sensitive material being relatively disposed so that a field induced by the spaced electrodes is capable of affecting the field sensitive material, a first of the spaced electrodes including an impedance portion and a plurality of conductive, substantially low impedance portions connected to different electrical locations of the impedance portion and extending therefrom, first terminal means connected to the impedance portion for applying an electrical signal thereto, a first capacitance electrically coupled with each of the conductive substantially low impedance portions, a second of the spaced electrodes including a conductive substantially low impedance portion, second terminal means connected to the second electrode for applying an electrical signal thereto, a second capacitance electrically coupled with the conductive substantially low impedance portion of the second electrode, and additional terminal means connected to the first and second capacitances for applying at least one electrical signal thereto.
A device according to claim 15, wherein the second electrode comprises a linearly-extending resistive portion and a plurality of conductive, substantially non-resistive strips electrically connected to different resistive locations of the resistive portion and extending transversely from the resistive portion, the first and second electrodes being disposed substantially coplanar, the resistive portions of the first and second electrode being spaced and the conductive strips being interleaved with the conductive strips of the first electrode extending towards the resistive portion of the second electrode and the conductive strips of the second electrode extending towards the resistive portion of the first electrode.
Dependencies are inferred from the claim text.