Television, colloquially known as TV, (from French télévision; from Ancient Greek τῆλε (tèle), meaning "far", and Latin visio, meaning "sight") is a telecommunication medium that is used for transm...
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.
Projection
Projection device
Button protecting
Adjusting device
Electronic apparatus
Optical assembly
Fixture device
Adjusting apparatus
Light cut
Cooling apparatus
http://en.wikipedia.org/wiki/Polarizer
http://en.wikipedia.org/wiki/Backlight
