LCD

LCD television

Some flat panel televisions employ Liquid Crystal Displays to produce images. LCD displays are made of layers of polarized glass containing liquid crystals in-between. Electric current applied to those crystals control their position and consequently the amount of light flowing from a source of light to the front of the screen to form images. LCD crystals do not emit light, they only act as shutters in front of  a source of light, such as LED or CCFL.