IMAGE DISPLAY APPARATUS

In an image display apparatus which projects and displays an image by scanning emitted light from light sources by a reflective mirror, a correction unit calculates a threshold value and a slope efficiency of a light amount vs. current characteristic of each of the plurality of light sources, from a first light amount value obtained by measuring a light amount when an input image signal agrees with a first reference signal level and a second light amount value obtained by measuring a light amount when the input image signal agrees with a second reference signal level; and corrects, when a calculation result of the threshold value and the slope efficiency varied after a predetermined time, a threshold current and also make a correction so that a light amount ratio of the light sources becomes the same as an initial value of a slope efficiency ratio.