Discrete and SMD models
There are also multiple types of EMCs on the market today, including discrete and surface-mounted diode (SMD) variations. It is relatively easy to identify a discrete display because, as mentioned earlier, it is a matrix made up of individual LEDs. In an SMD display, on the other hand, each set of RGB LEDs is contained within a package called a ‘chip.’

For the majority of EMCs on the market, discrete LEDs have been the dominant technology, at least until very recently. SMD displays have been available for indoor use for quite some time, but only now are being commonly adopted for outdoor installations, as well.

The choice between these two options will depend on the prioritization of the factors mentioned earlier. SMD displays offer a much wider viewing angle and comparatively lower cost, for example, but are not as bright as discrete displays. The lower light power output of SMD displays is due to the smaller size of the overall chip. That said, great strides have been made in increasing the brightness of these displays in the past few years, which is helping drive their use in outdoor applications.

J.D. Iles is a sales manager for Optec Displays, which engineers and manufactures light-emitting diode (LED) displays. For more information, visit www.optec.com.