High-resolution light distributions are lately in demand for vehicle headlamp systems as an innovative lighting approach. This lighting approach can realize functionalities, such as precise glare avoidance and on-road projection, which are useful for improving traffic comfort and safety. For achieving the required high-resolution light distribution, area-based projection technologies, such as DMD, LCD, and LCoS, are considered to be integrated into such headlamps. These projection devices demand rectangular illumination areas with specific light distributions to fulfill the requirements for illumination efficiency and performance in headlamp systems. Lenslet arrays, based on the principle of Köhler illumination, can effectively homogenize the light and shape it into rectangular shapes simultaneously. Such components are widely used in projection applications. However, they also show functional potentialities to be applied in high-resolution headlamps. This paper explains the design principles and methods of lenslet arrays for beam pre-shaping in headlamp systems. It validates the homogenization using a self-designed and manufactured lenslet array in a demonstrator in the first place. Afterward, this paper introduces two new methods for the centralized beam shaping required by some headlamps. These methods are validated by optical simulations.

中文翻译：

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基于小透镜阵列的光束预成形方法用于基于区域的高分辨率汽车前照灯系统

最近，作为一种创新的照明方法，汽车前照灯系统需要高分辨率的配光。这种照明方法可以实现一些功能，例如避免眩光和道路投影，这对于改善交通舒适性和安全性很有用。为了实现所需的高分辨率光分布，可以将基于区域的投影技术（例如DMD，LCD和LCoS）集成到此类前照灯中。这些投影设备需要具有特定光分布的矩形照明区域，以满足前照灯系统中照明效率和性能的要求。基于科勒照明原理的小透镜阵列可以有效地使光均匀化，并同时将其整形为矩形。此类组件广泛用于投影应用中。但是，它们也显示出可应用于高分辨率前照灯的功能潜力。本文介绍了用于前照灯系统中光束预整形的小透镜阵列的设计原理和方法。首先，它通过在演示器中使用自行设计和制造的小透镜阵列来验证均质化。随后，本文介绍了两种新的方法来实现某些前照灯所需的集中光束整形。这些方法已通过光学仿真验证。首先，它通过在演示器中使用自行设计和制造的小透镜阵列来验证均质化。随后，本文介绍了两种新的方法来实现某些前照灯所需的集中光束整形。这些方法已通过光学仿真验证。首先，它通过在演示器中使用自行设计和制造的小透镜阵列来验证均质化。随后，本文介绍了一些用于前照灯所需的集中光束整形的新方法。这些方法已通过光学仿真验证。