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

H - Electricity

04

N

355/9

H04N 3/22 (2006.01) H01J 29/56 (2006.01) H04N 9/28 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1160352

EQUIPMENT TO CORRECT ABERRATIONS OF A CATHODE-RAY BEAM 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-analogue converter 50 to analogue 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 invent- tion is applied to the correction of misconvergence in a shadow mask tube. UK9-79-004

364796

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