Characteristics and application research of partially coherent array beams in laser display systems

A partially coherent rectangular symmetric array beam for the light source of the laser display system is proposed. The speckle of the laser display system is simulated theoretically by using the angular spectrum method combined with the random phase screen, and the experimental results are given. It is found that unlike traditional lasers, with the increase of the brightness of the laser display system, the speckle contrast does not increase significantly, i.e., the image quality does not decline. The purpose of increasing the brightness of the laser display system without affecting the image quality is achieved by either increasing the number of arrays or increasing the output of laser. The array offset does not affect speckle contrast. Similar to the traditional partially coherent beam, the speckle of the laser display system can be effectively suppressed by reducing the spatial coherence of the partially coherent array beam while keeping the number of arrays unchanged. As a light source, partially coherent array beams provide a novel means to resolve the contradiction between the increase in brightness leading to an increase in speckle contrast and affecting imaging quality, which is different from the traditional methods, and will have a good application prospect in large-size laser display systems or outdoor laser display systems.