LED glossary

Cabinet. The framed tile that holds modules, power, and usually a receive card. Cabinets lock into a wall. See LED cabinets.

COB. Chip-on-board packaging: bare LED dies under a resin skin. Common at fine pitch for close viewing. See COB LED.

Contrast ratio. Difference between the brightest white and the darkest black the wall can show. See Contrast ratio.

DIP / SMD. Older through-hole lamps (DIP) versus surface-mount packages (SMD). Most indoor gym and sign product is SMD. See DIP, SMD, and COB.

DV-LED / direct-view LED. A wall of LEDs you look at directly, not an LCD with an LED backlight. See What a direct-view LED display is.

Hub board / Hub75. Distribution board or ribbon-style module interface inside many cabinets. See Hub boards and Hub75 modules.

IP rating. Dust and water ingress code. Outdoor walls commonly target IP65-class sealing when installed correctly. See IP rating and outdoor LED.

Mask. The face piece around the lamps that improves contrast and can take the first hit in a gym. See LED masks.

Module. The PCB tile of pixels that mounts into a cabinet. See LED modules.

Nits. Brightness in candelas per square metre. See Brightness.

Pixel pitch. Centre-to-centre distance between pixels in millimetres. Smaller pitch means finer image at close range. See Pixel pitch.

Receive card. The board in the cabinet that takes processed video data and drives the modules. See Receiving cards.

Refresh rate. How often the wall redraws, in hertz. Critical for cameras. See Refresh rate and Filming and livestreaming LED walls.

Sending card / LED processor. The box that accepts HDMI or other video and sends mapped data to the wall.