rearprojektion

Rear projection is a display technology where an image is projected onto the back of a translucent screen, allowing viewers to see the image from the front. This contrasts with front projection, where the projector is positioned in front of the screen. Rear projection systems are often found in televisions, monitors, and large display systems.

The core components of a rear projection system include a projector, a specialized screen, and an optical path between them. The projector generates the image, which is then directed through a system of mirrors or lenses to reach the back of the screen. The screen is designed to diffuse the projected light evenly across its surface, creating a visible image for the audience. This diffusion process is crucial for achieving good viewing angles and brightness uniformity.

Advantages of rear projection include a more compact design compared to some front projection setups, as the projector is hidden from view. It also generally avoids the issue of shadows cast by people walking in front of the screen, a common problem with front projection. However, rear projection systems can be bulky due to the screen and the required projection distance. They can also be sensitive to ambient light, which can wash out the image. Historically, rear projection televisions were a popular alternative to CRT televisions before the advent of flat-panel displays like LCD and plasma.