LCD backlighting systems with a high luminance and a good uniformity

We performed a 3-dimensional Monte Carlo simulation based on the Mie light scattering theory to investigate the photometric properties of a scattering polymer type light guide, that is known to give a very good brightness. Th e results reveal that the uniformity of the light guide with polymer scatte rers abruptly decreases as the length of tile light guide becomes larger th an 20 cm. To improve the uniformity of the light guide, we employed a wedge -shaped light guide with dot patterns along with polymer scatterers. As a r esult, we were able to obtain a backlighting system satisfying a good unifo rmity and a high luminance at the same time.