Constant current bias color switch for a beam penetration CRT

Details Constant current bias color switch for a beam penetration CRT Constant current bias color switch for a beam penetration CRT

1981-05-01

1984-10-09

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

315375, H04N 927, H01J 2580

Patent

active

044764855

ABSTRACT:
A high voltage color switch for a beam penetration CRT includes a constant current driver which provides a bias current to the high voltage transformer in the first color write period when the baseline color is being displayed. One or more secondary colors can be displayed during a second color write period during which a switch connects the transformer to a conventional voltage driver that provides the needed voltage swing. At the end of a secondary color write period the constant current driver is again connected to reset the flux level in the transformer to one end of its dynamic range. During a core reset interval only a small voltage offset appears on the anode of the CRT so that color information written in the baseline color appears without any perceivable change to a viewer. At the end of the core reset period the constant current source continues to supply a constant bias current to the primary winding of the transformer to maintain the flux level at one end of its dynamic range.

REFERENCES:
patent: 3339016 (1967-08-01), Merryman
patent: 3492416 (1970-01-01), Weber
patent: 3619647 (1971-11-01), Barkow
patent: 3697880 (1972-10-01), Melchior
patent: 3863097 (1975-01-01), Labudda
patent: 3887838 (1975-06-01), Thurston
patent: 4092566 (1978-05-01), Chambers
patent: 4104564 (1978-08-01), Cohen
patent: 4151444 (1979-04-01), Jenness
patent: 4203055 (1980-05-01), Chambers
patent: 4281272 (1981-07-01), Spilsbury

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