Patent ID: 8125471

Claim:
An image output apparatus comprising: a display device having a light modulation section which is divided into a plurality of channels and drives the divided channels; a plurality of level adjusting units that are provided for each channel, adjust the levels of video input signals for each channel, and output adjusted output signals to the display device; an input switching unit that switches a signal input to each of the level adjusting units from the video input signal to a first reference signal; an adjustment amount correcting unit that performs a basic correction process of comparing an output signal from each of the level adjusting units when the first reference signal is input with a second reference signal and increasing or decreasing an adjustment amount of the corresponding level adjusting unit by a predetermined correction amount such that a difference between the signals is reduced; a continuous correction control unit that controls the input switching unit to perform switching to the first reference signal during a first predetermined period included in a preparation period after a power supply is turned on or a preparation period before display starts, and controls the adjustment amount correcting unit to repeatedly perform the basic correction process a plurality of times; and an intermittent correction control unit that controls the input switching unit to perform switching to the first reference signal during a second predetermined period that is periodically generated other than the preparation period and controls the adjustment amount correcting unit to perform the basic correction process a predetermined number of times that is less than the number of times the basic correction process is repeatedly performed under the control of the continuous correction control unit.