Deflection correction signal timing

Details Deflection correction signal timing Deflection correction signal timing

1995-04-21

1997-07-15

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315398, G09G 104

Patent

active

056487037

ABSTRACT:
A deflection waveform correction signal generator comprises a parabolic shaped signal generator and first and second sawtooth shaped waveform generators. The first horizontal frequency sawtooth shaped waveform is generated by a clipped retrace pulse. The first sawtooth generator has an output coupled to an integrating circuit for generating a parabolic shaped signal. The sawtooth generator and sawtooth waveform 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. A control loop is coupled to the integrator and measures and maintains a pulse duration generated responsive to the parabolic signal. A control current is generated responsive to the pulse duration and is coupled to the integrator input to cause the parabolic shaped signal to be generated at a predetermined time interval. The pulse is also coupled to the second sawtooth generator which generates a horizontal rate signal for skew and trapezium correction. A multiplying circuit generates a trapezoidal correction signal by multiplication of the second sawtooth signal and a vertical rate sawtooth signal.

REFERENCES:
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patent: 5282033 (1994-01-01), Gleim et al.
Application Ser. No. 08/287,695, filed Aug. 9, 1994, Projection Television Apparatus.
EPO Search Report for Application 95 10 3533.

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