Projector Video Connector Guide
Table of contents
Video connectors are used to transmit and receive video signals, which are then converted into images displayed through the Projector. Here are the most common:
Composite video is an older, but still very frequently used analog connector on the projector. When carrying video signals, the composite video connector combines the luminance (Y) and chrominance (C) signals in a single channel, thus the video quality isn't quite up to the level of the S-Video or component connector. The composite video connector is yellow, and is usually marked as "Video" on the projector connector panel.
S-Video can provide cleaner video quality than composite video, as it separates the luminance (Y) and chrominance (C) signals in order to avoid possible interference between the two to enhance signal quality. The S-Video connector is a small, round input jack with four pins on it, and is usually marked "S-Video" on the projector connector panel. On the DVD player, game console, digital TV set-top box, and satellite receiver, the S-Video port is almost a must have connector, which is why most projectors will provide this connector no questions asked.
The component video connectors are three jacks colored green, blue and red, and often marked as Y, Pb, and Pr respectively on projector connector panel. The component video signal is split and compressed into separate luminance ("Y") and (two) color values including red minus luminance (R-Y) and blue minus luminance (B-Y). Depending on that, component video can offer image quality exceeding S-Video. As a result, component video provides an interface to link the projector with high definition devices such as DVD players.
The D-Sub connector is a standard 15-pin computer monitor connector that carries an analog RGB (Red, Green, Blue) signal. This connector is easily recognized and is marked "PC", "RGB", "VGA", or "D-Sub". With the D-Sub connector, a projector can be connected with not only the computer, but some game consoles, and digital TV set-top receivers.
The DVI (Digital Visual Interface) connector on the projector is usually of the DVI-D variety, meaning it carries a 100% digital video signal. The image quality it can offer is certainly higher than D-Sub and component, as there is no need to convert the digital video signals to analog between the projector and the digital source.