Light-collimating film
http://en.wikipedia.org/wiki/Memory_card
Waveform management
http://en.wikipedia.org/wiki/Micromirror_device
Light source module
Angle of a display controlling
Switch valve for a fuel cell
http://en.wikipedia.org/wiki/Backlight
http://en.wikipedia.org/wiki/Projector
Mounting device
Optical engine
http://en.wikipedia.org/wiki/Detector_(radio)
Eyeball locating
Photographing management
Projection lens
http://en.wikipedia.org/wiki/Lamp_(electrical_component)
Lamp door in projector
Projection optical system
en.wikipedia.org/wiki/Projector
Display device/power control circuit
