Optical engine
http://en.wikipedia.org/wiki/Projection_screen
http://en.wikipedia.org/wiki/Lens_(optics)
Radiating device
http://en.wikipedia.org/wiki/Thermal_management_of_electronic_devices_and_systems
Illuminating device
http://en.wikipedia.org/wiki/Digital_billboard
Light source brightness control
http://en.wikipedia.org/wiki/Backlight
Light guide unit
Reflective sheet
Light guide plate
http://en.wikipedia.org/wiki/Touchpad
Light-emitting device
Light source module
Projector casing
Fixation of a projection screen
Projection displaying system
