Research On Dynamic Measurement Method Of Speckle In Laser Display

In recent years,laser displays have replaced traditional displays in the market,but the existence of laser speckle will greatly affect the image display quality,so the measurement of speckle is also particularly important.Aiming at the measurement and evaluation of speckle in laser projection display system,a new speckle dynamic measurement method is proposed based on the standardized speckle measurement method and the dynamic measurement of speckle is fully realized with the designed hardware.The research content of this article is as follows:(1)The research analyzed the causes and optical statistical characteristics of laser speckle,and reproduced the current standardized speckle measurement experimental methods.According to the analysis results,it is concluded that the current measurement methods can not solve the problems of uneven screen brightness,laser grid and screen surface micro structure.(2)In order to solve the above problems,the research improved the standardized speckle measurement method,present a dynamic measurement method of laser speckle,described the principle of this method,and introduced the significance of dynamic speckle contrast,which provides a theoretical basis for subsequent dynamic measurement of speckle.(3)Based on the principle of dynamic speckle measurement,the research designed two feasible experimental methods.They are the small displacement experimental device method and the rotating glass plate changing light path method.The research used the designed speckle dynamic measurement device to conduct a large number of comparative experiments and obtain experimental data.(4)In order to prove that this speckle dynamic measurement method can well eliminate the background noise that interferes with speckle measurement,the research compared and analyzed the experimental data obtained by the dynamic speckle measurement method and the standardized speckle measurement method under the same measurement conditions.Finally,the feasibility and novelty of this research method are verified by comparing the experimental data.