Patent ID: 8659508

Claim:
A projector which displays an image by projecting a projection image onto a projection surface, comprising: a fixed pixel display device that displays the projection image in a predetermined vertical period corresponding to one image frame period; and an image processing device that generates the projection image in the vertical period, and includes: (i) a resolution converter which, by converting a resolution of an input image in the vertical period, generates and transmits a display image having a desired resolution; (ii) a projection distortion corrector which receives the display image, and generates the projection image by executing a correction process that includes correcting the display image in the vertical period in such a way as to correct a projection distortion occurring due to a projection angle with respect to the projection surface when projecting the projection image; and (iii) a display image input/output controller which receives the display image from the resolution converter and outputs the display image to the projection distortion corrector, the display image input/output controller being provided between the resolution converter and the projection distortion corrector, the display image input/output controller including a data input/output arbitrator that outputs a first instruction to control reception of the display image and outputs a second instruction to control transmission of the display image, and a data adjustment buffer memory that writes the display image in a storage area of a line memory corresponding to a write memory address transmitted by a memory address controller, the first instruction from the data input/output arbitrator directing the data adjustment buffer memory to write the display image in the line memory, and the second instruction from the data input/output arbitrator directing the data adjustment buffer memory to transmit the display image to the projection distortion corrector; and in the vertical period, the display image input/output controller holding the display image while receiving it from the resolution converter, during a time period from a predetermined timing prior to a start time of the correction process to a finish time of the correction process, and transmitting the display image to the projection distortion corrector, during a time period from the start time to the finish time of the correction process.