Patent ID: 6337545
Filing Date: 2002-01-08
Classification: G09G,H04N

Abstract:
An apparatus for generating a cathode ray tube (CRT) driving voltage for driving a deflection yoke for generating a horizontal deflection current in a CRT, the apparatus comprising:a first comparator for comparing a reference value with the peak value of a fly back pulse; a stability controller for shifting the level of the result of the comparison using a current mirroring technique and outputting a compared signal having a shifted level; a second comparator for comparing the compared signal with a sensing signal to obtain a reset signal; a pulse width modulated signal generator for outputting a pulse width modulated signal having a level which is determined in response to the logic level of the reset signal and the logic level of a clock signal locked to a horizontal synchronous signal; a driving voltage generator for generating the CRT driving voltage in response to the pulse width modulated signal; a voltage sensor for sensing the level of the CRT driving voltage to generate the sensing signal; and a horizontal output unit for generating the fly back pulse having an amplitude which is determined in response to the frequency of a horizontal output signal when the horizontal output signal is locked to the horizontal synchronous signal and the level of the CRT driving voltage.