SXRD (Silicon X-tal Reflective Display) is Sony's LCOS video projection technology. LCOS, or Liquid Crystal on Silicon is like a hybrid of DLP and LCD technologies. A layer of liquid crystal sits on top of a reflective surface. The light created by the lamp reflects off this surface, or not if the liquid crystal twists to block it.
SXRD is is similar in its design to JVC's D-ILA technology. SXRD is solely found in Sony front projectors but was once used extensively in their rear-projection TVs.
SXRD projectors offer much higher contrast ratios than LCD, DLP or even plasma displays. All current SXRD projectors are of a 3-chip design that uses a single LCOS chip for each of the primary colors (red, green and blue).