Cathode ray tube display systems

Details Cathode ray tube display systems Cathode ray tube display systems

1987-09-16

1988-07-26

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315366, 315370, H01J 2970, H01J 2972, H01J 2956

Patent

active

047603135

ABSTRACT:
A CRT display system providing a raster pattern, possibly for a flat screen CRT, has an oscillator driving a Line counter. The Line counter drives a Field counter and a Line DAC. The Field counter drives a Field DAC. In response, there are generated signals, representing functions, to be applied to the CRT deflection plates, and whereby there is represented the inverse of any function representing distortion of the raster pattern required to be corrected. At least one further DAC may be provided, comprising one of a pair of interacting DAC's, with one DAC driven by the Line counter, and one DAC driven by the Field counter, the output of said further DAC causing a combined function to be represented by the output of said other DAC. Said other DAC may comprise either the Line DAC, or the Field DAC; or said further DAC of another pair of interacting DAC's.

REFERENCES:
patent: 3437874 (1969-04-01), Cressey et al.
patent: 4441057 (1984-04-01), Wrona
patent: 4523225 (1985-06-01), Masuda et al.

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