The increasing demands for non-self-emissive portable display devices jointly stimulate the needs for additional front
light units to provide extra illumination to compensate for the ambient light in dim environment. The advantages of light
emitting diodes (LED), such as high efficiency and small size, make it an ideal source for the compact unit, but direct
LED lighting is impractical. Secondary optics is commonly adopted in illumination occasions to ensure the output from
the LED dies meet the overall specification. Considering an oblique incidence situation, light mapping redistribution is
inevitable. In this paper, we propose a beam shaping method adopting microlens array with various focal length to
achieve uniform light distribution. The design is based on edge ray principle, which considers each microlens
individually. Microlenses with various focuses were made by photoresist thermal reflow process to verify the novel
design.
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