Abstract: A projection display apparatus for projecting and displaying image light onto a projection plane includes an image light generator that generates the image light, a projection optical system including a projection lens that projects the image light onto the projection plane, a focus controller that controls focusing of the projection lens, and a temperature sensor that detects a temperature of the projection display apparatus. The focus controller operates to, calculate a plurality of focus deviation amounts which correspond respectively to a plurality of component groups based on first information obtained from the image light generator and second information obtained from the temperature sensor, the plurality of component groups being classified depending on kinds of components constructing the projection optical system, calculate a focus correction amount according to the plurality of focus deviation amounts calculated, and control the focusing based on the focus correction amount calculated.

Abstract: A projection display apparatus for projecting and displaying image light onto a projection plane includes an image light generator that generates the image light, a projection optical system including a projection lens that projects the image light onto the projection plane, a focus controller that controls focusing of the projection lens, and a temperature sensor that detects a temperature of the projection display apparatus. The focus controller operates to, calculate a plurality of focus deviation amounts which correspond respectively to a plurality of component groups based on first information obtained from the image light generator and second information obtained from the temperature sensor, the plurality of component groups being classified depending on kinds of components constructing the projection optical system, calculate a focus correction amount according to the plurality of focus deviation amounts calculated, and control the focusing based on the focus correction amount calculated.

Abstract: A projector has a single-screen display mode in which an image based on a single image signal is displayed and a dual-screen display mode in which images based on two respective image signals are displayed. When an image signal is input only to one input terminal and an image signal is not input to the other input terminal, the projector is set to the single-screen display mode and an image based on an image signal from a PC is displayed in a main screen. When input of an image signal to the other input terminal is confirmed during execution of the single-screen display mode, the projector switches from the single-screen display mode to the dual-screen display mode, so that an image based on an image signal from a PC1 and an image based on an image signal from a PC2 are simultaneously displayed in one screen.