Right-edge differential error convergence correction

Details Right-edge differential error convergence correction Right-edge differential error convergence correction

1996-01-19

1998-12-08

Lee, Michael

Television

Video display

Projection device

348747, 315371, 315370, H04N 3233, G09G 104

Patent

active

058477772

ABSTRACT:
A convergence correction circuit, for a cathode ray tube projecting images having keystone, differential sinusoidal and differential right-edge curl distortions, comprises generators for horizontal-rate, generally sinusoidal, 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 sinusoidal and differential right-edge curl distortions.

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John Barrett George, U.S. application serial No. 08/241,023, entitled Differential Error Convergence Correction, examined by T. Blum in Group 2202, allowed on Oct. 31, 1995 in issue batch No.Q65.

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