Study on projection screen and speckle contrast in laser display technology

摘要

We have promoted and demonstrated a relationship between speckle contrast and the fluctuation of the screen surface in Laser Display Technology (LDT). Based on the speckle theory, we analyzed the speckle characteristics of diffuse scattering screen, and obtained the relationship between speckle contrast C and the standard deviation of surface fluctuation height σ_h. Meanwhile, we used the precision probe surface profilometer to measure the height and morphology of 12 kinds of screens. Finally, we built a speckle testing platform to simulate human eye, and measured the speckle contrast of 12 kinds of screens. By analyzing the gain and speckle contrast parameters of glass bead screen and metal screen, we could conclude that glass bead screen was more suitable for LDT.