Before continuing to the three laser-based technologies recently found in pico projectors, we would like to introduce the “speckle” problem which is a problem shared by all laser-based displays, including projectors. “Speckle is a random intensity pattern produced by the mutual interference of a set of wavefronts” [7]. It basically means that there are shiny dots visible all over the image (as shown in Figure 7) and makes that image looks a bit metallic. Speckle is said to be less visible in videos than in static images.