Tolerance Analysis Study Of Flat View Display System

In-vehicle head-up display,also known as a flat-screen display system,is a visual aid driving system based on enhanced road safety.Due to the differences in vehicle architecture and the processing standards of structural component manufacturers such as mirrors,the imaging effect of in-vehicle head-up display is unstable,which in turn leads to the complexity of tolerance analysis.In this paper,we conduct a tolerance analysis study on two typical in-vehicle head-up displays,summarize the complete tolerance analysis process,analyze the correlation between the tolerances of the secondary mirror,primary mirror,PGU and the whole machine of the in-vehicle head-up display and the system imaging,and output the sensitivity of each structural component.With the analysis of key tolerance influencing factors,the system design difficulty can be reduced,the speed of optical path optimization can be improved,and the image quality can be improved to better meet the industry requirements.In this paper,we analyze and study the tolerances of flat-screen display system,and the main work is as follows:First,for the industry environment,two typical systems of single-curve vehicle head-up display and double-curve vehicle head-up display are built to explain the system architecture and working principle of vehicle head-up display,and to clarify the image quality evaluation criteria and calculation method of system imaging.The optimized design results of the two heads-up display systems can meet the tolerance analysis of the flat vision display system.Second,in the reverse optical path,Monte Carlo analysis in multiple modes was performed to obtain the results of ZEMAX tolerance analysis of the system architecture.At the same time,ARtrix HUD Tools was used to convert the optical path to obtain the results of multi-mode Monte Carlo tolerance analysis in the forward optical path,and the applicability of the Monte Carlo tolerance analysis method to the two in-vehicle head-up display systems was analyzed by comparing and summarizing the tolerance analysis of the forward and reverse optical paths.The results show that the macroscopic Monte Carlo analysis is less applicable to the tolerance analysis of the system.Thirdly,the key part of this research,that is,combined with the image quality evaluation standard of the system imaging,the control variable method is applied to continuously change the offset and tilt tolerance amount of each optical part and the whole machine degrees of freedom of the system within a certain tolerance range,and the sensitivity degree of the output is obtained by analyzing the imaging effect of the system before and after the change,especially the influence on the dynamic aberration,and the influence relationship between the tolerance change of each degree of freedom and the image quality.Then,the consistency between theory and practice is verified by building an experimental platform.Combining the theoretical and experimental results,it is shown that the tolerance analysis study through system imaging is more comprehensive for the tolerance analysis of the flat-view display system and meets the requirements for the analysis of the tolerance of the vehicle head-up display.