Patent ID: 6686929
Filing Date: 2004-02-03
Classification: G09G,H04N

Abstract:
A broadband switching drive compensating circuit for a video display device, comprising:a horizontal size detecting circuit connected to a B+2 driving current, said horizontal size detecting circuit detecting a horizontal size of a displayed video image; a horizontal frequency detecting circuit detecting a horizontal frequency in response to an externally applied horizontal synchronization signal; a first DC (direct current) voltage generating circuit generating a first DC voltage according to the detected horizontal size; a second DC voltage generating circuit connected to a B+3 driving current, said second DC voltage generating circuit generating a second DC voltage according to the detected horizontal frequency; a driving current compensating unit for altering a B+1 driving current in response to the generated first and second DC voltages; and a horizontal deflection unit having a horizontal output transistor supplying a sawtooth current to a horizontal deflection coil, characterized in that a driving condition of said horizontal output transistor is compensated for according to the altered B+1 driving current.