Digital Light Processing is another 3D Printing process very similar to stereolithography.
DLP technology was created in 1987 by Larry Hornbeck of Texas Instruments. It uses digital micro mirrors laid out on a semiconductor chip. This technology is applicable for movie projectors, cell phones and 3D printing.
Like SLA, DLP also works with photopolymers however it works with a different source of light. For DLP, 3D amateurs generally use more conventional sources of lights such as arc lamps.
The material used for printing is liquid plastic resin that is placed in the transparent resin container. The resin hardens quickly when affected by a large amount of light. Printing speed is pretty impressive. The layer of hardened material can be created in a few seconds.
The results of such printing are robust and have an excellent resolution. The biggest advantage of DLP over SLA is that it requires much less materials to be used for detail production, that results in lower cost and it creates less waste.