LED [light-emitting diodes] display is a video display. LED panel is a small display, or a component of a larger display. LEDs are typically used for outdoors in store signs and billboards and also as form of lighting, for the purpose of general illumination, task lighting, or even stage lighting rather than display.
LED panels are of two types: conventional, (using discrete LEDs), and surface-mounted device(SMD) panels.
Individually Mounted LEDs are built around discrete LEDs which are used for most outdoor screens and some indoor screens. A full-color pixel is formed with a cluster of red, green, and blue diodes which is usually square in shape.
For absolute pixel resolution, these pixels are spaced evenly apart and are measured from center to center. In this world the largest LED display is located in Las Vegas, Nevada covering the Fremont Street Experience which is over 1,500 foot (457.2 m) long.
The indoor screens on SMD technology is now extending to the outdoor market. The driver PC board is mounted with a chipset which is mounted with the combination of red, green, and blue diodes. The difference is that the maximum viewing distance is reduced by 25% from the discrete diode screen with the same resolution. For SMD technology ,a minimum brightness of 600 candelas per square meter (cd/m², sometimes informally called nits) is required for Indoor screen which is more than sufficient for corporate and retail applications but for high ambient brightness conditions, higher brightness required for visibility.

Two examples of high-brightness stage lighting fashion and auto shows which require higher LED brightness.

For a shot television studio set the screen requires lower brightness levels with lower color temperatures (common displays have a white point of 6500 to 9000 K, which is much bluer than the common lighting on a television production set).

For outdoor use, At least 2,000 cd/m² is required for outdoor use, whereas 5,000 cd/m² cope is better for higher-brightness types of direct sunlight on the screen.The factors such as line of sight, local authority planning 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 (accounting 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 are essential for suitable locations for large display panels.

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