Stroke during retrace color switch

Details Stroke during retrace color switch Stroke during retrace color switch

1981-05-01

1984-08-28

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

315375, H04N 927, H01J 2980

Patent

active

044686919

ABSTRACT:
A high voltage color switch for a beam penetration CRT is well suited to generating a color write in one or more random colors during the retrace interval of a TV raster scan, or the like. The scanning period of the TV raster is in the baseline color for maximum resolution and brightness. A driver connected to the high voltage transformer includes a low voltage power supply which has one portion controlled by a switch. During the color write period the switch is closed so that the driver can provide a suitable waveform to the transformer to obtain the required swing. During the raster scan, the switch is open so that the magnetizing current in the transformer can be reset over the entire TV raster scan interval causing only a slight offset in the baseline color.

REFERENCES:
patent: 3492416 (1970-01-01), Weber
patent: 3619647 (1971-11-01), Barkow
patent: 3863097 (1975-01-01), Labudda
patent: 3887838 (1975-06-01), Thurston
patent: 3914617 (1975-10-01), Corbel
patent: 4092566 (1978-05-01), Chambers
patent: 4104564 (1978-08-01), Cohen
patent: 4151444 (1979-04-01), Jenness
patent: 4160996 (1979-07-01), Nigra
patent: 4281272 (1981-07-01), Spilsbury

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