Convergence correction circuit and three tube type projector hav

Details Convergence correction circuit and three tube type projector hav Convergence correction circuit and three tube type projector hav

1996-07-03

1999-11-09

Miller, John W.

Television

Video display

Projection device

313428, 31536819, 31536826, 348807, H04N 322, H04N 928, H01J 2970, G09G 128

Patent

active

059824581

ABSTRACT:
A convergence correction circuit for use in a projection CRT of the electrostatic focusing type, including a neck portion provided with a sub-deflection yoke for convergence correction. A coupling correction filter and an eddy current correction filter are interposed between a path of a convergence correction signal. The coupling correction filter corrects a change in correction frequency characteristic due to an influence of coupling of a sub-deflection yoke and a deflection yoke, and the eddy current correction filter corrects a change in correction frequency characteristic due to an influence of an eddy current caused in an electrostatic convergence electrode by a magnetic field generated in the sub-deflection yoke. When a coil of the sub-deflection yoke is supplied with a current proportional to an output of the correction filter, convergence correction is performed. There is obtained correction frequency characteristic which is flat, so that a motion of an image on a fluorescent screen of the cathode-ray tube coincides with a wave form of a correction signal. Therefore, high-precision convergence correction can be obtained.

REFERENCES:
patent: 3894267 (1975-07-01), Matsumoto et al.
patent: 4833370 (1989-05-01), Sakurai et al.
patent: 4961030 (1990-10-01), Ogino
patent: 5070280 (1991-12-01), Okuyama et al.

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