Patent ID: 8866976

Claim:
A projector comprising: an image projection device adapted to modulate light emitted from a light source in accordance with image information based on an image signal input from an image input terminal, and then project the light modulated on a projection surface; an angle detector adapted to detect an installation angle of the projector; a keystone distortion correction device adapted to perform a keystone distortion correction of a projection image projected on the projection surface based on the installation angle detected by the angle detector; a storage device adapted to store information; and a controller adapted to record a variation in the installation angle as installation angle variation information on the storage device in a case in which the angle detector detects the variation when the projector is in operation, wherein the controller checks whether or not the installation angle variation information is recorded on the storage device in a power-OFF sequence of the projector, and then announces occurrence of the variation in the installation angle in a case in which at least one piece of the installation angle variation information is recorded on the storage device.