Patent ID: 8054305
Filing Date: 2011-11-08
Classification: G09G

Abstract:
1. An image display apparatus for driving a plurality of display devices through a plurality of row wirings and a plurality of column wirings in matrix, comprising: a modulation circuit that outputs a pulse width modulation signal for driving the display device to the column wiring based on modulation data; and a correction circuit that outputs the modulation data to be applied to the modulation circuit, based on luminance data designating luminance of the display device, wherein the correction circuit includes: a timing control circuit that divides a drive period assigned for drive of the display devices into a plurality of calculation slots; a luminance calculation circuit that calculates luminance including an effect of a voltage drop in the row wiring for each calculation slot; an accumulation circuit that temporally accumulates the luminance for each calculation slot; a corrected data determination circuit that outputs, as a corrected data, a value determined in accordance with the calculation slot at a time point when an accumulated luminance value obtained by the temporal accumulation reaches a target luminance value; and a conversion circuit that converts the corrected data into the modulation data; wherein a width of the calculation slot is shorter than a width of a slot for pulse width modulation by the modulation circuit in at least a part of the drive period; and wherein the conversion circuit reduces a bit width of the corrected data by pseudo-gradation processing.