Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-12-08
1980-11-11
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358240, 358230, 358241, 313220, H04N 930
Patent
active
042336236
ABSTRACT:
A television display system is described in which a full resolution, interlaced scanned display of real-time images is provided on a gas discharge display panel. Real time scanning of the display panel in synchronism with the received television video signal is achieved by separating the panel into N (where N is an integer greater than one) distinct sections, each of which is driven by a different maintain signal waveform. The maintain signal waveforms for each Nth section is synchronized with the received television video signal corresponding to that section so that the received video information can be displayed at its correct relative position in the image to be displayed without receiving extensive electronic memory buffering or storing of video information. The maintain voltage has a magnitude less than the lower limit of the bistable region in which gas discharge panels are normally operated. Thus, the application of trigger voltage pulses can initiate a sequence of discharges which continue for a substantial number of cycles before diminishing to zero. The number of cycles for which the discharge persists depends on the magnitude and duration of the addressing trigger voltage pulse. When the panel is operated in the refresh mode (viz., addressing pulses are applied to the panel once each time a new television picture frame is displayed in repetitive fashion), the average brightness of the light emitted by each element of the image is controlled by varying the magnitude of the trigger pulse. Light emitting elements of a gas discharge display panel are grouped in triads which have red, blue, and green phosphor elements to provide for the display of color television images. The gas discharge device is an A.C. plasma panel dependent upon a capacitive memory of the types disclosed in Bitzer et al. U.S. Pat. No. 3,559,190 and Mayer U.S. Pat. No. 3,860,846.
REFERENCES:
patent: 3942060 (1976-03-01), Harvey
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