http://en.wikipedia.org/wiki/Projector
http://en.wikipedia.org/wiki/Backlight
http://en.wikipedia.org/wiki/Light_source#Light_sources
http://en.wikipedia.org/wiki/Light_beam
Optical projection apparatus
Phosphor/fluorescent gel/LED
Illumination system
http://en.wikipedia.org/wiki/Heat_sink
Electric screen
Projection device
Image projecting apparatus
Rear-projection display apparatus
Plane light source apparatus
Lens cap device
