In a TFT LCD (thin-film-transistor liquid-crystal display), each pixel has three sub-pixels: a red, green and blue. Each of these sub-pixels has its own transistor which allows the individual pixel to be turned on or off. These pixels and transistors are contained within a layer of insulating liquid between other transparent layers. Pixel size defects on the display can result from malfunctioning transistors or uneven distribution of this insulating liquid inside the display. Writer Bio
