Equipment to correct aberrations of a cathode ray beam

Details Equipment to correct aberrations of a cathode ray beam Equipment to correct aberrations of a cathode ray beam

1980-12-08

1982-10-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, H01J 2970, H01J 2976

Patent

active

043541437

ABSTRACT:
Aberrations of an electron beam are corrected as the beam is scanned across the screen of a cathode ray tube by deriving correction signals from stored digital values by means of the calculus of finite differences. The digital values, which are the initial differences of polynomial correction functions, are held in store 10 and summed in adder 20, the results being converted by digital-to-analog converter 50 to analog signals and supplied to the cathode ray tube. Provision is made for the reduction of error in the calculations by shifting higher order differences relative to lower order differences before addition. The circuitry may be implemented on a single chip. Preferably, the invention is applied to the correction of misconvergence in a shadow mask tube.

REFERENCES:
patent: 4203051 (1980-05-01), Hallett et al.
patent: 4203054 (1980-05-01), Sowter

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