Dark line reduction
http://en.wikipedia.org/wiki/Color_wheel_(optics)
http://en.wikipedia.org/wiki/Projector
Reflection element
http://en.wikipedia.org/wiki/Gas-discharge_lamp
Bulb brightness
Supporting rack
http://en.wikipedia.org/wiki/Backlight
Illumination system
Heat dissipation
Elevating mechanism
Light source device
Backlight button assembly
Elevating structure for projector
Adjusting displayed colors of a projector
http://en.wikipedia.org/wiki/Color_wheel
Zoomable projection device
