Patent ID: 7170565

Claim:
An automatic brightness stabilization (ABS) apparatus that minimizes color shifts caused by degradation in an electron gun of a cathode ray tube (CRT), the ABS apparatus comprising: an image signal processing portion, which inserts a predetermined signal into a vertical flyback period of an image signal to generate a resulting signal, and applies the resulting signal to the electron gun as an applied resulting signal; an ABS signal detecting portion, which detects a component of the applied resulting signal affected by the electron gun; a velocity modulating portion, which generates a velocity modulation signal for emphasizing luminance components of the image signal and applies the velocity modulation signal to a velocity modulation coil of the CRT; and a retrace cancelling portion, which generates a cancel signal for cancelling the velocity modulation signal generated by the velocity modulating portion, during the vertical flyback period, wherein the image signal processing portion compares an amplitude of the component detected by the ABS signal detecting portion with a predetermined amplitude and controls an amplification degree of the image signal according to a comparison result.