23 September 2015 Matrix light and pixel light: optical system architecture and requirements to the light source
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Abstract
Modern Automotive headlamps enable improved functionality for more driving comfort and safety. Matrix or Pixel light headlamps are not restricted to either pure low beam functionality or pure high beam. Light in direction of oncoming traffic is selectively switched of, potential hazard can be marked via an isolated beam and the illumination on the road can even follow a bend. The optical architectures that enable these advanced functionalities are diverse. Electromechanical shutters and lens units moved by electric motors were the first ways to realize these systems. Switching multiple LED light sources is a more elegant and mechanically robust solution. While many basic functionalities can already be realized with a limited number of LEDs, an increasing number of pixels will lead to more driving comfort and better visibility. The required optical system needs not only to generate a desired beam distribution with a high angular dynamic, but also needs to guarantee minimal stray light and cross talk between the different pixels. The direct projection of the LED array via a lens is a simple but not very efficient optical system. We discuss different optical elements for pre-collimating the light with minimal cross talk and improved contrast between neighboring pixels. Depending on the selected optical system, we derive the basic light source requirements: luminance, surface area, contrast, flux and color homogeneity.
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Benno Spinger, Benno Spinger, Andreas L. Timinger, Andreas L. Timinger, } "Matrix light and pixel light: optical system architecture and requirements to the light source", Proc. SPIE 9629, Optical Systems Design 2015: Illumination Optics IV, 96290G (23 September 2015); doi: 10.1117/12.2192374; https://doi.org/10.1117/12.2192374
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