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摘要:
智慧汽车的发展对具备投影功能的智能车灯系统提出了更高的要求。Micro LED投影显示技术因其良好的自发光特性使之与传统技术相比系统结构更为简单，光利用率更高，更有利于小型化、节能化和集成化。本文提出了一种基于Micro LED阵列的车灯投影方案，设计了以像素尺寸为80 μm×80 μm的200×150白光Micro LED阵列作为显示光源，视场角为16°×34°物像倾斜的车灯投影光学系统，对物面倾斜角度和光学系统结构进行了优化。此外，分别采用反向畸变处理方法和像素灰度调制方法解决车灯投影图像的梯形畸变和照度均匀性问题，并搭建了投影实验平台，对图像校正方法进行了验证。实验结果表明：校正后x、y方向的图像梯形畸变系数分别从0.0932和0.3680下降至0.0835和0.0373，像面照度均匀性从83.2%提高到93.2%。本文通过基于Micro LED的倾斜投影车灯光学系统优化设计及其图像校正方法，实现了高光效、低畸变的车灯投影。
Abstract:The development of smart cars puts forward higher requirements for intelligent light systems with projection functions. Compared with the vehicle light system using traditional technology, the vehicle light system using Micro LED projection display technology can make the system structure simpler and the light utilization rate higher, which is more conducive to miniaturization, energy saving and integration because of its good self-luminous characteristics. In this paper, we propose a light projection scheme based on Micro LED array, design a 200×150 white Micro LED array with a pixel size of 80 μm×80 μm as the display light source and the field of view angle is 16°×34° object image tilt, and optimize the tilt angle and optical system structure of the object surface. In addition, the reverse distortion processing method and the pixel grayscale modulation method are used to solve the problems of keystone distortion and illumination uniformity of the projected image of the vehicle light, and a projection experimental platform is built to verify the image correction method. The experimental results show that the keystone distortion coefficients of the corrected images in the x and y directions decrease from 0.0932 and 0.3680 to 0.0835 and 0.0373, respectively, and the uniformity of the illumination of the image surface increases from 83.2% to 93.2%. In this paper, the optimization design of the oblique projection vehicle lighting system based on Micro LED and its image correction method are used to realize the projection of the vehicle light with high luminous efficiency and low distortion.
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图 1Micro LED车灯投影系统结构示意图
Figure 1.Structural schematic of Micro LED headlight projection system
图 5光学系统成像质量评价分析图
Figure 5.Analytical diagram for the evaluation of the imaging quality of the optical system
图 6优化后的车灯投影光学系统光路图
Figure 6.Optimized optical path diagram of the headlight projection optical system
图 8不同温度下系统各视场的MTF图
Figure 8.MTF diagram for each field of view of the system at different temperatures
图 17校正输出图像的照度分布
Figure 17.Correction of the illumination distribution of the output image
表 1车灯投影系统Micro LED阵列参数
Table 1.Parameters for Micro LED arrays for the vehicle light projection systems
指标 参数 像素尺寸/μm 80×80 像素数量 200×150 阵列尺寸/mm 16×12 总光通量/lm 2000 
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表 2投影物镜关键参数及设计指标
Table 2.Key parameters and design specifications for projection objectives
指标 参数 工作波段 400−700 nm F数 2 视场 16°(V)×34°(H) 焦距 40 mm MTF ≥0.5@0.0125 lp/mm（−20 °C~80 °C） 下载:
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表 3系统公差表
Table 3.Table of system tolerance parameters
参数 值 曲率半径/N 3 表面不规则度ΔN 0.3 厚度/mm 0.02 表面偏心/mm 0.01 表面倾斜/° 0.02 折射率公差 0.001 阿贝数公差 1% 装调偏心/mm 0.03 装调倾斜/° 0.05 下载:
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表 4光学系统公差分析结果
Table 4.Optical system tolerance analysis results
参数 值 名义值 0.720 最佳值 0.725 最差值 0.456 平均值 0.680 标准差 0.060 下载:
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表 5校正前后图像梯形畸变对比
Table 5.Comparison of image trapezoidal distortion before and after correction
梯形畸变系数 校正前 校正后 p1 0.0932 0.0835 P2 −0.3680 −0.0373 下载:
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