Patent ID: 6108045
Filing Date: 2000-08-22
Classification: H04N

Abstract:
A display apparatus having a horizontal deflection circuit for supplying a deflection current to a horizontal deflection coil and deflecting an electron beam emitted from an electron gun in a cathode ray tube, and being capable of underscanning to control a deflection size by said deflection current smaller than a size of a faceplate of said cathode ray tube, said display apparatus comprising:a luminance detecting circuit which detects a luminance of said cathode ray tube;a deflection size control quantity adjusting circuit coupled to said luminance detecting circuit, which produces an adjustment voltage for adjusting said deflection size in accordance with the detected luminance; andsaid adjustment voltage being varied in accordance with changing of luminance, at different rates as between a detected first luminance range and a detected second luminance range different from said first luminance range.