Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-12-08
1996-06-18
Pascal, Robert J.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, 348746, 348521, G09G 104
Patent
active
055281125
ABSTRACT:
A deflection waveform correction signal generator comprises a multiplying circuit for generating a pincushion correction signal. A horizontal frequency ramp is generated by a clipped retrace pulse. The ramp generator has an output coupled to an integrating circuit for generating a parabolic shaped signal. The ramp generator and ramp integrator are reset at a horizontal rate by reset pulses of differing duration. The different duration of reset pulses results in the parabolic signal having regions of non-parabolic shape. The parabolic shaped signal is coupled to an input of the multiplying circuit. A control circuit is coupled to the parabolic shaped signal for maintaining a peak amplitude thereof by controllable coupling to the ramp generator. A control loop is coupled to the integrator for controlling an integrator input bias current to generate the parabolic shaped signal at a predetermined time interval.
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Application Serial No. 08/287,695, filed 8/9/94, Art Group 2602, Projection Television Apparatus,Examiner: N. West.
Fernsler Ronald E.
George John B.
Truskalo Walter
Davenport Francis A.
Laks Joseph J.
Pascal Robert J.
Philogene Haissa
Thomson Consumer Electronics Inc.
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