Television – Video display – Projection device
Patent
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.
Laks Joseph J.
Lee Michael
Metelski Marion P.
Tripoli Joseph S.
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