Flat-panel TVs create images by using a perfectly flat, fixed grid of square or rectangular pixels (short for "picture elements")
. You may hear plasma and LCD TVs referred to as "fixed-pixel" displays. Flat-panel TVs only have a single resolution, which is called the "native resolution" of the panel. This number is a pixel count: generally given as the number of horizontal pixels by the number of vertical pixels, such as 640 x 480 or 1024 x 768. The various video signals we watch (480i, 480p, 720p, 1080i) are converted to match the panel's native resolution by a "scaler" that's either built in or a separate component.