Projection system
Optical touch device
Light convergence/optical component regulation
http://en.wikipedia.org/wiki/Polarized_3D_system#Linearly_polarized_glasses
http://en.wikipedia.org/wiki/Stereo_display
Optical touch control device
Lens collar
Power control in projector
Position prompt device/lens regulation
http://en.wikipedia.org/wiki/Zoom_lens
Projection display system
Light source unit
Adjusting device for projector
Power supply switching device
Backlight lamp bar fixing
http://en.wikipedia.org/wiki/Backlight
Light-emitting device
