| Summary: | 碩士 === 國立成功大學 === 微電子工程研究所 === 103 === We have proposed and later successfully implemented a rotational angle approach to design the freeform reflector for white LED lamp secondary optics applications. In the simulation, the lamp illumination uniformity is 87.21%, illumination efficiency is 73.09%, and illumination is 500 lux~1000lux, which are compliant with the initial specifications. A novel asymmetric illumination lamp is designed to render a portion of the light signal being transferred to the target area by freeform reflector. The measurement result is in good agreement with the simulation result. On the other hand, the lens curvature of MLA can be reliably tailored by controlling the process parameters associated with the photolithography and wet etching time. The focal length of mircolens array is experimentally found in the range of 150±10μm, as compared to the theoretical calculated value of 145.2μm. A reasonable agreement between the theoretical calculation and experimental results is achieved.
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