Abstract: A projection display apparatus is provided which forms an optical image corresponding to image information by optically processing a light beam emitted from a light source lamp and projects this optical image with a projection lens unit on a projection screen under magnification. The projection display apparatus may include a lighting count detector that detects a lighting count of the light source lamp, and a replacement warning unit that outputs a warning signal, which urges a user to replace the light source lamp, in case where the lighting count detected by the lighting count detector reaches a predetermined value, making it possible to more accurately determine the lifetime of the light source lamp by detecting the lighting count which affects the lifetime of the light source lamp.

Abstract: A liquid crystal projector which can surely reproduce pictures by automatically setting the optimum sampling parameter based on inputted analog video signals. The projector stores data for discrimination formed by weighting and grouping different display modes by using the horizontal and vertical scanning data of the analog video signals and polarity data of synchronizing signals in a ROM (52), detects the horizontal and vertical scanning data of the analog video signals and polarity data of synchronizing signals by means of a discriminating condition detecting section (60), and discriminates the display mode of the inputted analog video signals based on the detected results of the detecting section (60) and the grouped data for automatic binding.

Abstract: A technique to adjust each projector of a multi-projector system by simple operations when an identical image is projected on a screen by a plurality of projectors. A communication control unit controls serial communications with an external device through a serial communication port P1 or P2. When receiving a stack definition packet through the serial communication port P1, a control unit stores ID information into a memory based on number information that represents a number of working projectors included in the input stack definition packet, increments the number information in the stack definition packet, and transmits the updated stack definition packet through the serial communication port P2. In response to a command input through the serial communication port P1, the control unit determines whether or not an address of the input command designates itself as the projector of interest, based on address information included in the command and the ID information stored in the memory.

Abstract: The presentation support system comprises a projector that displays presentation images utilized in a presentation, a presentation support device that produces support information for supporting the presentation according to the progress status of the presentation, and a support information display device that displays the support information. The projector is equipped with a support controller that supplies the support information display device with the support information supplied from the presentation support device.