ABSTRACT
All the slide or movie projectors work with the same basic optical principles. However, the classic slide projectors and the home movie projectors have now lost much of their popularity owing to the new computer and home theater liquid crystal display (LCD) projectors. A description of most of the main types of projectors can be found in some books. A few important facts have to be remembered when designing these lenses, for example: In another method commonly used in portable television projectors, the color image is formed in a transparent LCD. They were invented by Gene Dolgof when he was trying to develop a new kind of projector that could produce brighter images than the cathode ray tube television projectors. When designing the projecting lens for these projectors, it is desirable to make it telecentric of the object side.
