Laser Based Projection System for Displays, Signage and Illumination

A laser based projection system is described and demonstrated for display, illumination, and signage applications. The approach achieves high coupling efficiency of multiple laser beams at each of the three primary colors red, green, and blue with the use of tapered fiber bundles that couple light from multiple multimode fibers to the inner cladding of a double clad fiber. The fiber delivers the signals to an optical projection head for spatial modulation and projection. The method allows for scalable, pay-as-you-grow systems with fault tolerant flexibility for potential source failures. We show that the use of multiple lasers for each primary wavelength and the propagation of the signal through multimode fibers also allows for reduced speckle in the system.