Patent ID: 6084560
Filing Date: 2000-07-04
Classification: G09G

Abstract:
An image display apparatus for dither halftoning a video signal that enters from an external unit and displaying the resulting video signal on a display unit, comprising:a dither halftoning circuit converting the video signal to a dither output signal by using dither threshold values; andan XY address control circuit generating X-direction and Y-direction address signals for specifying dither threshold values used in said dither halftoning circuit, said control circuit including:a Y-direction counter generating the Y-direction address signal by counting a horizontal synchronizing signal which is reset by a vertical synchronizing signal;a multiplier doubling the generated Y-direction address signal;an adder adding 1 to the doubled Y-direction address signal; anda selector selecting, when the inputted video signal is an interlaced signal, the Y-direction address signal outputted from said multiplier or said adder on the basis of whether an odd- or even-numbered field signal is received by said selector.