Patent ID: 7423661

Claim:
An image display apparatus comprising; display elements, the display elements performing brightness gradation display by being applied with a modulated signal; a modulation circuit for generating a modulated signal modulated based on incoming drive data; and a clock supplying circuit for supplying a reference clock whereof the frequency changes at a predetermined cycle for controlling a pulse width of the modulated signal or at least one of the pulse width and a crest value transition to the modulation circuit, wherein the modulation circuit generates such modulated signal that the difference in display brightness generated when making the display elements display by two modulated signals obtained based on the drive data having one gradation difference in a first range of gradations, which is part of an entire range of gradations of the incoming drive data, becomes smaller than the difference in display brightness in a second range of gradations, which is different from the first range of gradations, wherein the modulation circuit enumerates the reference clock and controls the pulse width of the modulated signal or at least one of the pulse width and the crest value transition based on the enumerated value and the drive data, and wherein a drive data converting unit for converting incoming data and outputting output signals as the drive data is provided in a previous stage of the modulation circuit, and the total number of gradations of the signals outputted from the drive data converting unit is smaller than the total number of gradations in data to be supplied into the drive data converting unit.