Convergence correction circuit

Details Convergence correction circuit Convergence correction circuit

1988-05-16

1990-12-25

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, G09G 104, H01J 2970

Patent

active

049806149

ABSTRACT:
A convergence correction circuit according to the present invention has a phased locked loop including a programmable counter. The programmable counter has programmable count start and end points. The output of the programmable counter is supplied to a memory storing convergence distortion correcting data therein. As the horizontal screen size is increased, a value closer to the lower limit 0 of the start point as compared with that taken when the horizontal size is small is set as the count start point of the programmable counter, and a value closer to the upper limit (2.sup.7 -1) of the end point as compared with that taken when the horizontal size is small is set as the count end point. In accordance with the horizontal screen size, the count start and end points of the programmable counter are changed. Correct convergence correction is performed even if the horizontal screen size is changed.

REFERENCES:
patent: 4422019 (1983-12-01), Meyer
patent: 4623825 (1986-11-01), Wahlquist
patent: 4672275 (1987-06-01), Ando
patent: 4849652 (1989-07-01), Hulshof

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