Automatic brightness stabilization apparatus and method of image display device

A signal processing apparatus for minimizing effects of at least one of a velocity modulation signal and a dynamic focus signal on an image signal of a cathode ray tube (CRT) of an image device wherein an automatic brightness stabilization (ABS) signal detecting portion detects a component of an applied first signal applied to an electron gun, a velocity modulating portion generates the 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, the signal processing apparatus comprising:

• an image signal processing portion, which inserts a predetermined signal into a vertical flyback period of the image signal to generate a first signal, and applies the first signal to the electron gun as the applied first signal,
• 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.

A method for minimizing effects of at least one of a velocity modulation signal and a dynamic focus signal on an automatic brightness stabilization (ABS) signal of a cathode ray tube (CRT) device, the method comprising:

• canceling the velocity modulation signal during a vertical flyback period.