SPECKLE REDUCTION IN A PROJECTION SYSTEM

摘要

A projection system (1) comprising at least one coherent light source (2), a modulator (4) for modulating light from said light source, and a lens (8) for projecting modulated light from the modulator onto a screen (9). The system further has a fast switching liquid crystal (LC) element (6) positioned in the optical path between said at least one coherent light source and said lens (8), and adapted to scatter light passing said LC element; and a driver for varying the scattering of said LC element. By controlling the scattering of the LC element to be continuously changing whenever light is projected onto the screen, the coherency of the light is removed which reduces the speckle in the displayed image.