Projection display apparatus which enables a selected image inverting process to be performed to facilitate registration adjustment

A projection display apparatus comprising:

• a light source;
• a spatial light modulation device modulating, on the basis of a video signal, each of primary color lights for color display emitted from the light source;
• projecting section projecting, onto a screen, each of the primary color lights modulated by the spatial light modulation device;
• image inverting selecting device which enables a user to select an image inverting process to be performed in any one of (i) a horizontal only direction, (ii) a vertical only direction, and (iii) the horizontal direction and the vertical direction;
• signal processing section performing the image inverting process on the video signals so that an image projected on the screen is inverted in the selected one of the horizontal only direction, the vertical only direction, or the horizontal direction and the vertical direction on the screen;
• and
• correcting section correcting, based on a correction value entered by an operation on the screen, the video signal for each of the primary color lights so as to reduce misregistration between the primary color lights projected on the screen, and supplying the corrected video signal to the spatial light modulation device,
• wherein when the image projected on the screen is inverted, the correction value with a sign is entered by an operation on the screen, the sign being different from that of misregistration direction under a coordinate system where the image is not inverted.