Dynamic convergence control apparatus for shadow mask CRT displa

Details Dynamic convergence control apparatus for shadow mask CRT displa Dynamic convergence control apparatus for shadow mask CRT displa

1980-12-24

1983-05-24

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2951

Patent

active

043852599

ABSTRACT:
An apparatus for providing precise convergence compensation in a shadow mask type color CRT display. Coarse compensation is provided by the coefficients of primary terms x.sup.2, y.sup.2 of the beam's longitudinal and vertical position polynomial in an analog format, and fine compensation is provided by digital programmable read-only-memories. The fine compensation is representative of the precise values of the coefficients of the remaining terms in these polynomials, and a digital-to-analog converter converts the fine compensation to an analog format. The coarse and fine data are summed together and applied to the convergence correction coils of the CRT.

REFERENCES:
patent: 3517252 (1970-06-01), Williams, Jr.
patent: 3825796 (1974-07-01), Bello
patent: 3943279 (1976-03-01), Austefjord
patent: 3961223 (1976-06-01), Ray et al.
patent: 3996611 (1976-12-01), Toone
patent: 4095137 (1978-06-01), Oswald
patent: 4203051 (1980-05-01), Hallett et al.
patent: 4203054 (1980-05-01), Sowter
patent: 4331906 (1982-05-01), Fujino et al.

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