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Optical design and optimization of planar curved LED end-lit light bar

机译：平面弯曲LED背光灯条的光学设计和优化

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This study investigates the optical design of planar curved LED end-lit light bars using v cuts as light-diverting structures. The application of LEDs in automotive lighting has become popular, especially in signal lamps and daytime running lamps. Most designs adopt a direct back light using arrays of LEDs with diffusive coupling optics, which often causes problems such as low uniformity, glaring, and excessive LEDs. Edge-lit LED light guides in automotive applications share a similar principle with the light-guide plates in back-light models of LCD but with much more complicated geometry. However, related literature on the optical design of nonrectangular light-guide plates is very limited. This study addresses the design of planar curved LED end-lit light bars and the optimization scheme for illuminance uniformity. V cuts are used as the optical coupling features, and the lead angles of the v cuts are varied to achieve optimum axial luminous intensity. This study presents a solution to reduce the illuminance difference between the inner and the outer portions of curved light bars by introducing gradual taper v cuts across the curved section. A line graph with preselected anchor points is proposed to define the size distribution of evenly spaced v cuts along the light bar. A fuzzy optimization scheme is then applied to iterate the anchor size to achieve illuminance uniformity. The designs of a planar curve light bar with a rectangular cross section and a light-guide ring with a circular cross section are presented to illustrate the design scheme.
机译：这项研究调查了使用v切口作为光转向结构的平面弯曲LED末端照明灯条的光学设计。 LED在汽车照明中的应用已变得普及，尤其是在信号灯和日间行车灯中。大多数设计采用带有散射耦合光学器件的LED阵列采用直接背光，这通常会导致诸如均匀度低，眩光和LED过多的问题。汽车应用中的边缘照明LED导光板与LCD背光模型中的导光板具有相似的原理，但几何形状要复杂得多。然而，关于非矩形导光板的光学设计的相关文献非常有限。这项研究解决了平面弯曲LED尾灯条的设计以及照度均匀性的优化方案。 V形切口用作光学耦合部件，并且V形切口的超前角可以变化，以实现最佳的轴向发光强度。这项研究提出了一种解决方案，该方案可通过在弯曲部分上引入逐渐变细的V形切口来减少弯曲灯条的内部和外部之间的照度差。提出了带有预选锚点的线图，以定义沿灯条均匀分布的v形切口的尺寸分布。然后，应用模糊优化方案来迭代锚点的大小，以实现照度均匀性。提出了具有矩形截面的平面曲线灯条和具有圆形截面的导光环的设计，以说明设计方案。

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