6 March 2013 by Permi Krishna
The LCD screens uses the light modulating properties of liquid crystals but these don't emit light directly. So, a light source is necessary for proper viewing. Important factors to consider when choosing a LCD display include resolution, response, viewing angle, brightness and contrast ratio. A popular variant is TFT LCD . TFT LCD use thin-film transistor (TFT) technology to improve image quality i.e. addressability, contrast etc.