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Design of new collection systems for multi LED light engines

机译：用于多LED光引擎的新收集系统的设计

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LED based projectors have numerous advantages compared to traditional projectors: they are more compact, exhibit a larger color gamut and a longer lifetime, the supply voltage is lower, the absence of ultra violet, infrared radiation and mercury vapour, etc. Furthermore LED's can switch on and off very rapidly (possibility to pulse them) and they have a high dimming ratio that can be used to improve the contrast. However, there is also an important disadvantage: the optical power per unit of etendue (luminance) of an LED is significantly lower than that of e.g. an UHP-lamp. Because of this and the etendue limitation of the projector (small light valve, f-number projection lens), the projected flux on the screen will not be high. Despite this shortcoming, LED's are still very interesting for low power applications because of their superior properties. However we have to collect the available light flux optimally and combine multiple LED's with high luminance within the available system etendue. In this paper we have studied collection optics that collect the LED flux with high optical efficiency and collimation and reshape the spot in a uniform illuminated rectangle with the sizes of the micro display. We have designed 'Gradually Tapered Light Pipes', 'Elliptical Reflectors' and 'Parabolic Reflectors'. Furthermore we have combined many of these LED/collector combinations to get a high luminance illumination engine for LED based projectors.
机译：与传统的投影仪相比，基于LED的投影仪具有许多优势：它们更紧凑，具有更大的色域和更长的使用寿命，电源电压更低，不存在紫外线，红外辐射和汞蒸气等。此外，LED可以切换可以非常快速地打开和关闭（可以对其进行脉冲），并且它们具有很高的调光比，可以用来改善对比度。然而，还有一个重要的缺点：LED的单位展度（亮度）的光功率显着低于例如每单位的光功率。 UHP灯。因此，由于投影机（小光阀，f值投影镜头）的光展量限制，在屏幕上投影的光通量不会很高。尽管有这些缺点，但由于其优越的性能，LED在低功率应用中仍然非常有趣。但是，我们必须最佳地收集可用的光通量，并在可用的系统扩展量内结合多个具有高亮度的LED。在本文中，我们研究了收集光学器件，该光学器件以高光学效率和准直度收集LED光通量，并在具有微型显示器尺寸的均匀照明矩形中对点进行整形。我们设计了“渐变锥形光管”，“椭圆形反射镜”和“抛物面反射镜”。此外，我们结合了许多这些LED /收集器组合，以获得用于基于LED的投影仪的高亮度照明引擎。

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