An LED Display, or light emitting diode display, is a flat panel display that uses light emitting diodes as the video display. An LED display panel can be either a small display or part of a larger display. An LED panel consists of several LEDs, whereas an LED display consists of several LED panels. LED displays are used in billboards and store signs, and in recent years have also become commonly used in destination signs on public transport vehicles or even as part of transparent glass area.

There are two main types LED displays: conventional led displays, which use discrete LEDs, also named DIP. And surface-mounted device (SMD) displays. Most outdoor displays and some indoor displays are built around discrete LEDs, Also known as individually mounted LEDs. A cluster of red, green, and blue diodes is driven together to form a full-color pixel, usually square in shape. These pixels are spaced evenly apart and are measured from center to center for absolute pixel resolution.

Most indoor screens on the market are built using SMD technology, a trend that is now extending to the outdoor market. (Outdoor SMD screen right now is not mature enough yet). An SMD pixel consists of red, green, and blue diodes mounted in a single package, which is then mounted on the driver PC board. The individual diodes are smaller than a pinhead and are set very close together. The difference is that the maximum viewing distance is reduced by 25% from the discrete diode screen with the same resolution.

Indoor use generally requires a screen that is based on SMD technology and has a minimum brightness of 600 candelas per square meter. This will usually be more than sufficient for corporate and retail applications, but under high ambient-brightness conditions, higher brightness may be required for visibility. Fashion and auto shows are two examples of high-brightness stage lighting that may require higher LED brightness. Conversely, when a screen may appear in a shot on a television studio set, the requirement will often be for lower brightness levels with lower color temperatures. Common displays have a white point of 6500-9000K, which is much bluer than the common lighting on a television production set.

For outdoor use, at least 2000cd/sqm is required for most situations, whereas higher-brightness types of up to 5000cd/sqm cope even better with direct sunlight on the screen.

Suitable locatioins for lage display panels are identified by factors such as line of sight, local authority palnning requirements ( if the installation is to become semi-permanent), vehicular access (trucks carrying the screen, truck-mounted screens, or cranes), cable runs for power and video (according for both distance and health and safety requirements), power, suitability of the ground for the location of the screen (if there are no pipes, shallow drains, caves, or tunnels that may not be able to support heavy loads), and overhead obstructions.