Bulb brightness
Supporting rack
http://en.wikipedia.org/wiki/Backlight
Illumination system
Heat dissipation
Elevating mechanism
Light source device
Backlight button assembly
http://en.wikipedia.org/wiki/Projector
Elevating structure for projector
Adjusting displayed colors of a projector
http://en.wikipedia.org/wiki/Color_wheel
Zoomable projection device
Housing of projection device
Device for processing image data
DC driving device
Determination system
