Build Your Own XGA Projector!
`In principle, both store-bought and do-it-yourself projectors consist of a liquid crystal display backlit by a light source. An old or used flatscreen LCD is ideal for the display; these can be picked up for prices starting at around $100. [..]
Once you’ve settled on a screen, you can turn your attention to getting hold of an overhead projector. Used devices can be had for as little as $50.’
