Abstract: A video projector includes a display device which receives an image signal and generates image light projected onto a projection surface. A scaling processor scales the input image signal. An OSD processor generates and corrects an adjustment pattern image in accordance with a correction instruction on the projection surface. An image signal synthesizer combines the image signal processed by the scaling processor with an OSD image signal generated and corrected by the OSD processor to generate a combined image signal. A trapezoidal distortion corrector performs trapezoidal distortion correction on the combined image signal from the image signal synthesizer based on the correction of the adjustment pattern image on the projection surface. The adjustment pattern image generated by the OSD processor includes a reference quadrangle pattern and downsized quadrangle patterns, which are reduced in size from the reference quadrangle pattern.

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.

Abstract: When a history image display mode is performed, a display region of a display unit of a projector is divided into a plurality of windows. In a main window, an image based on a currently selected image signal is displayed. In a plurality of sub windows, history images as images based on image signals selected in the past are displayed in accordance with chronological order. When a user desires to switch an input image, the user uses a remote controller or a manipulation unit to perform a manipulation to select a desired history image on a screen of the display unit. When the manipulation to select a history image is performed, the projector selects an input terminal corresponding to the selected history image, and causes an image based on an image signal from the input terminal to be displayed in the main window.

Abstract: A projector including an input unit which includes 1 (1 is a natural number) input ports and receives n (n is a natural number not more than 1) image signals supplied from n image-signal supplying devices, respectively via n input ports, a display unit which selects two image signals from the n image signals received by the input unit and displays images based on these two image signals respectively on a main window and a subwindow, and a notification unit which displays a notification image which gives notification about information regarding the two image signals, on a blank area of a image display area of the display unit.

Abstract: A video projector includes a display device which receives an image signal and generates image light projected onto a projection surface. A scaling processor scales the input image signal. An OSD processor generates and corrects an adjustment pattern image in accordance with a correction instruction on the projection surface. An image signal synthesizer combines the image signal processed by the scaling processor with an OSD image signal generated and corrected by the OSD processor to generate a combined image signal. A trapezoidal distortion corrector performs trapezoidal distortion correction on the combined image signal from the image signal synthesizer based on the correction of the adjustment pattern image on the projection surface. The adjustment pattern image generated by the OSD processor includes a reference quadrangle pattern and downsized quadrangle patterns, which are reduced in size from the reference quadrangle pattern.

Abstract: A projection-type picture display device for displaying an entire OSD image in a state superimposed on a picture without any part of the OSD image overhanging from the picture. An aspect ratio changing unit adjusts the size of the picture by changing an aspect ratio of the picture. An image generation unit generates the OSD image including characters superimposed on the picture. An image synthesizing unit synthesizes the OSD image with the picture of which the aspect ratio has been changed to superimpose the OSD image on the picture. A trapezoidal distortion correction unit performs trapezoidal distortion correction on the picture that has been synthesized with the OSD image in the image synthesizing unit. The image generation unit adjusts the size of the characters in the OSD image in accordance with the size of the picture of which the aspect ratio has been changed.