Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-09-30
1989-01-17
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315367, H01J 2956
Patent
active
047990007
ABSTRACT:
Horizontal and vertical deflection windings in a deflection yoke coil assembly of a CRT (cathode ray tube) having stroke written or raster scan displays are driven by x and y analog deflection signals, respectively. Each of the x and y analog deflection signals are converted to x and y digital signals, respectively, sampled to provide x, y sample sets which are coupled to a digital x correction signal memory and a digital y correction signal memory, respectively. Geometric corrections are stored in the memories for each of a predetermined number of x, y signal set values which correspond, respectively, to a number of point locations over the CRT screen. The x and y corrections that are addressed from the memories are supplied to MDACs (multiplying digital to analog converters) and then to analog delay line filters which supply the x, y analog correction signals for summing with the x, y analog deflection signals, respectively. The x and y digital signals are also coupled to separate astigmatism, dynamic focus, shading and convergence memories which are coupled to DACs (digital to analog converters) and then to respective CRT controls or associated circuitry.
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Blum Theodore M.
Briody T. A.
Magnavox Government and Industrial Electronics Company
Seeger R. T.
Streeter W. J.
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