Patent ID: 8648793

Claim:
An image display apparatus comprising: a display unit configured to display an image; an image quality adjustment unit configured to adjust an image quality of the display unit; an illuminance change detector configured to obtain a detected illuminance value from each of a plurality of illuminance detectors that detect illuminance values outside the display unit, and to determine whether the illuminance value detected by said each illuminance detector changed from one illuminance range to another illuminance range; and an image quality control unit configured to set, upon determining by the illuminance change detector that the illuminance values detected by one or more of the plurality of illuminance detectors changed from the one illuminance range to said another illuminance range, different timing to change an image quality adjustment value set in the image quality adjustment unit from an image quality adjustment value corresponding to the one illuminance range to an image quality adjustment value corresponding to said another illuminance range, depending on how many of the illuminance values detected by the plurality of illuminance detectors changed from the one illuminance range to said another illuminance range.