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首页> 外文会议>Nonimaging optics and efficient illumination systems V >Further studies on output couplers for edge-lit backlight with emission angle control
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Further studies on output couplers for edge-lit backlight with emission angle control

机译：带有发射角控制的侧光式背光输出耦合器的进一步研究

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摘要

We have studied designs of an edge-lit backlight that can switch its emission angle range between a narrow and a wide state. Here, we propose three types of output couplers for this type of backlight unit. These are quadratic prism, triangular prism and arc prism. The probability of extracting the light propagating inside a light-guide does not depend on its propagation angle for each of these output couplers. We conducted ray tracing analysis to compare these output coupler designs. The results show that approximately 65% illumination uniformity and 75% efficiency can be obtained with the quadratic prism. For each setting of the emission range, the width of the angular distribution is switched between 30 and 102 degrees (FWHM). Other two output couplers perform poorly in terms of these optical properties.
机译：我们已经研究了可在窄和宽状态之间切换其发射角范围的侧光式背光源的设计。在这里，我们为这种类型的背光单元提出三种类型的输出耦合器。它们是二次棱镜，三角棱镜和弧形棱镜。对于这些输出耦合器中的每一个，提取在光导内部传播的光的可能性并不取决于其传播角度。我们进行了光线跟踪分析，以比较这些输出耦合器设计。结果表明，使用二次棱镜可获得约65％的照明均匀度和75％的效率。对于发射范围的每种设置，角度分布的宽度在30度和102度（FWHM）之间切换。就这些光学特性而言，其他两个输出耦合器的性能较差。

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