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Increased brightness by light recirculation through an LED source

机译：通过LED光源的光循环增加亮度

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LED light sources are finding ever increasing application in illumination. LEDs have many advantages, such as high efficiency, long life, compactness, directional light emission, mechanical resistance, low-temperature operation, light color control and low UV or IR emissions. These and other advantages make them very well suited for general illumination applications as well as flashlights, car headlights, backlights, or frontlights. In most applications, LEDs are combined with optics to direct their light output. Brighter LEDs have a smaller emission area and, therefore, may be coupled to smaller optics. This is very important in many applications where compactness is crucial, particularly automotive headlamps. When LED brightness is insufficient, it can be augmented by recirculating part of the emitted light back to the LED's emitting surface. This increase in brightness comes at the expense of a reduced flux-emission. As an example, the brightness of an LED with a diffuse reflectivity of 70% may be increased by nearly that much if it is coupled to a high-efficiency recirculating optic. Such augmentation, however, comes at the expense of a flux reduction, as much as 50%. Several optical geometries are explored in this paper to achieve that recirculation together with raytracing results using on a simple model of an LED. Also a number of optical architectures will be shown that escape the classical nonimaging etendue limit associated with traditional optics.
机译：LED光源在照明中的应用日益广泛。 LED具有许多优点，例如效率高，寿命长，紧凑，定向发光，机械阻力，低温操作，光色控制以及低UV或IR发射。这些和其他优点使它们非常适合常规照明应用以及手电筒，汽车前灯，背光或前灯。在大多数应用中，LED与光学器件结合使用以引导其光输出。较亮的LED具有较小的发射区域，因此可以耦合到较小的光学器件。这在紧凑性至关重要的许多应用中非常重要，特别是汽车前照灯。当LED亮度不足时，可以通过将一部分发射光再循环回到LED的发射表面来提高亮度。亮度的增加是以减少通量发射为代价的。作为示例，如果将其与高效循环光学器件耦合，则具有70％漫反射率的LED的亮度可能会增加几乎两倍。然而，这种增加是以减少通量为代价的，高达50％。本文探讨了几种光学几何结构，以在简单的LED模型上实现再循环和光线跟踪结果。同样，将显示出许多光学体系结构，这些体系结构摆脱了与传统光学器件相关的经典非成像集光率限制。

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