Texas Instruments produces the DLP pico projector which supports HVGA resolution. In 2004 Canon introduced the XEED SX50 LCD projector. Both involve a camera and a projector. One wonders whether the projector blew a light bulb. Digital movies are projected using a digital video projector instead of a film projector. The mechanism became a key to the development of the movie camera and projector. This darkening can be compensated by increasing the brightness of the projector light source. The planetarium was upgraded to a full-dome digital projector in 2014. A mathematical model is used for describing the imaging properties of projector and cameras. The first 4K home theater projector was released by Sony in 2012. Photos depict the affair as rather drab with a cheap curtain and one projector light. It is a modern equivalent of the slide projector or overhead projector. The main precursor to the movie projector was the magic lantern. Armaments included sonic generators, pulse bolts, a minigun, and a retractable unibeam projector. Slides are developed and shown to an audience using a slide projector.