Patent ID: 6473139
Filing Date: 2002-10-29
Classification: H04N

Abstract:
A video display deflection apparatus, comprising:means for generating a deflection field in a cathode ray tube to vary a beam landing location of an electron beam of said cathode ray tube; a first memory space containing beam landing error correction data that are read out of said first memory space, during a given deflection cycle, and applied to said deflection field generating means for varying said deflection field by a variable amount that varies in accordance with said varying beam landing location; a second memory space containing beam landing error correction data that are read out from said second memory space and stored in said first memory space, during a mode set up procedure; a third memory space containing beam landing error correction data; a bit error detector for detecting data bit error in the data stored in one of said first and second memory spaces; and a controller for reading out said beam landing error correction data of said third memory space and for storing said read out data of said third memory space in one of said first and second memory spaces to replace said data bit error containing data, after said data bit error has been detected.