Patent ID: 8289349

Claim:
A correction method employed by a correction circuit in an image display apparatus having a plurality of display elements disposed in a matrix shape, a plurality of scanning wirings, a plurality of modulation wirings, a scanning circuit that applies a scanning signal to the display elements via the scanning wirings, a plurality of modulation circuits provided respectively for the modulation wirings to apply a modulation signal to the display elements via the modulation wirings, and the correction circuit, which corrects luminance unevenness caused by characteristic differences among the modulation circuits, the correction method comprising the steps of: correcting input luminance data using a correction value; and generating the modulation signal on the basis of the corrected luminance data, wherein the correction value is determined using a correction value determination method comprising: a first step of measuring a luminance value of each of the display elements by displaying a first image including luminance unevenness caused by characteristic differences among the display elements and the luminance unevenness caused by characteristic differences among the modulation circuits, and calculating a first luminance value serving as a representative luminance value of the display elements for each of the modulation circuits from a result of the measurement; a second step of measuring the luminance value of each of the display elements by displaying a second image in which the luminance unevenness caused by characteristic differences among the modulation circuits is smaller than that of the first image displayed in the first step, and calculating a second luminance value serving as a representative luminance value of the display elements for each of the modulation circuits from a result of the measurement of the luminance value of each of the display elements by displaying the second image; and a third step of calculating the correction value corresponding to each of the modulation circuits using a value obtained by dividing the first luminance value by the second luminance value.