Patent ID: 8670038

Claim:
A projection display device adapted to display a projection image based on external image data input externally, comprising: a projection section adapted to project image light representing the projection image on a projection surface; an image data storage section adapted to store projection image data including the external image data; an image control section adapted to execute an image data obtaining process for obtaining the external image data and storing the external image data in the image data storage section, and making the projection section project the projection image; an image capturing section adapted to capture a projection area including the projection surface and a measuring image projected on the projection surface to generate a captured image; and a correction amount determination section adapted to execute a correction amount determination process for determining a correction amount for correcting the projection image using the captured image, wherein the image control section halts the image data obtaining process during a period in which the correction amount determination section is executing the correction amount determination process, and after the correction amount determination process is terminated, makes the projection section display a temporary projection image obtained by correcting an image data previously stored in the image data storage section, using the correction amount determined, and resumes the image data obtaining process.