Patent ID: 7375711

Claim:
An electro-optical device comprising: a plurality of scanning lines; a plurality of data lines; pixel circuits having electro-optical elements respectively provided corresponding to intersections of the plurality of scanning lines and the plurality of data lines; and a brightness control circuit for controlling the brightness of the electro-optical element of each pixel circuit, based on grayscale data, to control peak brightness, the brightness control circuit comprising: a brightness state judging circuit for, whenever grayscale data for one line or plural lines defining a partial frame is inputted, calculating a brightness state for one frame-length including the one line or plural lines defining a partial frame and judging the brightness state based on the calculation result, wherein the brightness state judging circuit comprises: a first adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding grayscale data for the one line or plural lines; a shift circuit for holding the addition result of the first adding circuit for one frame-length; a second adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the shift circuit corresponding to the number of lines for the one frame-length including the one line or plural lines; a judging circuit for, whenever grayscale data for one line or plural lines is inputted, judging the brightness state for the one frame-length including the one line or plural lines based on the addition result of the second adding circuit; and a brightness mode selecting circuit for selecting one mode from a plurality of brightness modes based on the judgment result of the judging circuit; and a brightness control circuit for, whenever grayscale data for the one line or plural lines is inputted, controlling the brightness of electro-optical elements of pixel circuits for one line or plural lines based on the judgment result of the brightness state judging circuit.