http://en.wikipedia.org/wiki/Backlight
http://en.wikipedia.org/wiki/Touchscreen
Optical touch device
Light guide device
Light source module
http://en.wikipedia.org/wiki/Color_wheel_(optics)
Optical device for controlling projectors
Projection screen frame
Optical device for controlling a projector
Brightness enhancement film
Light guide plate
Light guide element
Light guiding unit
Backlight brightness adjusting system
