Wednesday, May 13, 2009

What is a pixel on a LED display?

A light emitting diode (LED) is a semiconductor device that emits visible light when current passes through it. A pixel on a LED display can be composed of one or more LEDs. A pixel is the smallest individual component of an image. For example 16mm, 20mm, 25mm LED displays can utilize 1 LED per pixel for monochrome signs and 3 LED per pixel for full color LED displays (1-red, 1-green, 1-blue). Whereas a 32 mm LED signs can have have 4 LEDs per pixel for monochrome LED signs, and 5 LEDs per pixel for full color (2-red, 1-green, 1-blue). When determining the quality of the display, the number of LEDs per pixel is not as important as the overall brightness of the LEDs. High grade LEDs exceed 5000 NITs. Some LED display manufacturers try to overcome inferior LEDs by adding more LEDs of the same color to each pixel. This makes the pixel larger, which increases the viewing distance, but it also increases energy consumption.