Optimization and Design of LCD Diffuser Plate with Micro-Semisphere Structure

Abstract The diffuser plate is the key component of the direct type LED backlight module. The optimization and design of the micro-structures on the surface of the diffuser plate are the critical factors in manufacturing diffuser plate of good optical properties. A mathematical model of direct type LED backlight is built. The size and arrangement of microsemispheres are simulated using Lighttools7.0 software based on a Monte Carlo ray tracing. The influence of the magnitude and arrangement of micro-semispheres on the optical properties of the diffuser plate is analyzed by this method. And when the sphere's radius is fixed, the center distance is optimized for the best one. Simulation results show that: the uniformity of luminance increases with the increase of the radius value, while the uniformity of luminance decreases with the increase of the center distance value.