Through the careful control and variation of the voltage applied, the intensity of each subpixel can range over 256 shades. Color displays take an enormous number of transistors. For example, a typical laptop computer supports resolutions up to 1,024 by 768. Most active matrix displays have a few bad pixels scattered across the screen. LCD technology is constantly evolving.
Display size is limited by the quality control problems faced by manufacturers.
Simply put, to increase display size, manufacturers must add more pixels and transistors. As they increase the number of pixels and transistors, they also increase the chance of including a bad transistor in a display. Manufacturers of existing large LCDs often reject about 40 percent of the panels that come off the assembly line. The level of rejection directly affects LCD price since the sales of the good LCDs must cover the cost of manufacturing both the good and bad ones. Only advances in manufacturing can lead to affordable displays in bigger sizes.