Brightness enhancement film
http://en.wikipedia.org/wiki/Backlight
http://en.wikipedia.org/wiki/Traffic_light
Lighting condensing film
Light guide film
Optical touch device
Projection screen mechanism
Cooling method for projector
Lighting device
Optical projection system
http://en.wikipedia.org/wiki/Illumination_(lighting)
http://en.wikipedia.org/wiki/Optical_membrane
http://en.wikipedia.org/wiki/Liquid-crystal_display
Light guide plate
