The "cell board" in LED electronic display screen is the main part of the display screen, that is, the whole display screen consists of a cell board, which is a PCB circuit board welded with ic, LED lamp beads and other components. Various types of cell boards have different sizes, such as: P4 cell board size: 128* 128, P5 cell board size: 160* 160, P 16 cell board size: 256*256.

The unit board of LED display screen, also known as LED display screen module or unit board for short, is the main unit of LED display screen, which consists of LED, driving circuit, driving IC and plastic kit.

In the LED display industry, LED unit boards are now divided into two categories. Indoor unit boards are generally called face stickers (three-in-one face stickers) in the industry; Outdoor and semi-outdoor are generally called modules.