Patent ID: 8454172

Claim:
A projector device, comprising: an image generation unit that generates an image; an irradiation unit that irradiates light for projecting the image generated by the image generation unit upon a projection surface; a change unit that changes luminance of the light irradiated from the irradiation unit to a first luminance and a second luminance, a light amount of the second luminance being greater than a light amount of the first luminance and a heat generation amount of the irradiation unit with the second luminance being greater than a heat generation amount of the irradiation unit with the first luminance; and a temperature information determination unit that determines temperature information in a neighborhood of the irradiation unit; an image type decision unit that decides as to a type of the image generated by the image generation unit, wherein: the change unit firstly changes the luminance of the light irradiated from the irradiation unit to the first luminance and then changes the luminance of the light irradiated from the irradiation unit to the second luminance when the temperature information determination unit has determined that the temperature information in the neighborhood of the irradiation unit designates a temperature higher than a predetermined value, in case the image type decision unit decides that the type of the image generated by the image generation unit is a still image; and the change unit changes the luminance of the light irradiated from the irradiation unit to the second luminance from the beginning irrespective of the temperature information determined by the temperature information determination unit, in case the image type decision unit decides that the type of the image generated by the image generation unit is a moving image.