Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1997-05-15
1998-05-05
Issing, George C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315370, 348746, G09G 128, H01J 2951, H04N 323
Patent
active
057479488
ABSTRACT:
A correction circuit for a cathode ray tube displaying images subject to distortions comprises: a multiplier for a first horizontal sine waveform and a vertical parabola waveform to define a correction signal, the vertical parabola having a zero value during vertical retrace; a summer for combining a second horizontal sine waveform with the correction waveform to define a composite correction signal, one of the second horizontal sine waveform and the correction signal being first inverted; and, a correction coil for the cathode ray tube receiving the composite correction signal and generating a dynamic magnetic field responsive to the composite correction signal for correcting a residual inner pincushion distortion and for correcting a horizontal linearity distortion imparted by the correction of the residual inner pincushion distortion. When the first and second horizontal rate sine waves are generated by the same waveform generator, the composite correction signal further corrects any distortion due to asymmetry of the horizontal rate sine waveform as generated.
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patent: 5576774 (1996-11-01), Hosoi et al.
Davenport Francis A.
Issing George C.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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