In digital imaging
, a pixel
, or picture element
is a physical point in a raster image
, or the smallest addressable element in an all points addressable display device
; so it is the smallest controllable element of a picture represented on the screen. The address of a pixel corresponds to its physical coordinates. LCD
pixels are manufactured in a two-dimensional grid, and are often represented using dots or squares, but CRT
pixels correspond to their timing mechanisms and sweep rates.