Differential error convergence correction

Details Differential error convergence correction Differential error convergence correction

1994-05-11

1996-04-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348746, 31536818, H01J 2956

Patent

active

055085938

ABSTRACT:
A convergence correction circuit, for a cathode ray tube projecting images having keystone, differential sine and differential left edge curl distortions, comprises generators for horizontal rate sine, horizontal rate sawtooth and horizontal rate pulse waveforms. A summer combines the horizontal rate waveforms into a horizontal rate composite waveform. A multiplier and an amplifier generate as an output signal a product of the horizontal rate composite waveform and a vertical rate sawtooth waveform. A convergence correction coil is coupled for receiving the output signal and generating a dynamic magnetic field correcting the keystone, differential sine and differential left edge curl distortions.

REFERENCES:
patent: 2880358 (1959-03-01), Parker
patent: 4395662 (1983-07-01), Sexton, Jr.
patent: 4563618 (1986-01-01), Haferl
patent: 4766354 (1988-08-01), Oliver
patent: 4810939 (1989-03-01), Watanabe et al.
John B. George, Convergence Correction, U.S. application file wrapper continuation, 08/493,595, filed Jun. 22, 1995.

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