Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-05-05
1988-08-23
Miller, Stanley D.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350332, 350336, 358 65, 358223, 358236, G02F 113
Patent
active
047657170
ABSTRACT:
An electron beam addressed liquid crystal light modulator or "valve" includes a liquid crystal cell having a target surface which a writing electron beam and an erasing electron beam address to provide a display image. The writing electron beam and the erasing electron beam sequentially strike preselected locations on the target surface to cause an emission of secondary electrons and, thereby, develop an electrostatic potential at such preselected locations. A secondary electron collector electrode positioned over and above the target surface collects in a uniform manner the secondary electrons emitted by all regions of the target surface. A collector electrode controller circuit sequentially applies first and second potential differences between the target surface and the collector electrode in synchronism with the striking of the preselected locations by the respective writing and erasing beams. The first potential difference causes the collector electrode to collect a sufficient number of the secondary electrons to maintain the electrostatic potential at the preselected locations on the target surface. This causes the liquid crystal cell to transmit light in a first polarization sense. The second potential difference causes the collector electrode to collect a relatively small number of the secondary electrons.
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Buzak Thomas S.
Vatne Rolf S.
Angello Paul S.
Gallivan Richard
Miller Stanley D.
Tektronix Inc.
Winkelman John D.
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