Patent ID: 6111371
Filing Date: 2000-08-29
Classification: H04N

Abstract:
A video display apparatus, comprising:a synchronization signal having a frequency selected from a range of deflection frequencies;a deflection circuit responsive to said synchronization signal for generating a deflection current in a deflection winding and for generating a correction signal to correct a beam landing error of an electron beam in a cathode ray tube;a source of a data signal having a value that is indicative of said selected deflection frequency;a digital-to-analog converter responsive to said data signal for generating at a terminal an output signal having at least three selectable levels, where at a first level, a first deflection frequency is selected, where at a second level, a second deflection frequency is selected and where at a third level, a third deflection frequency is selected; anda plurality of switches, each being responsive to a given digital-to-analog output signal level, for selectively coupling corresponding impedances to said deflection circuit to establish said beam landing error correction signal, in accordance with a selected combination of states of said switches, such that first, second and third combination of states is selected in accordance with said first, second and third levels, respectively, of said digital-to-analog converter output signal.