Nonspherical LED packaging lens for uniformity improvement |
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Authors: | Yu-Cheng Chang Chung-Jen Ou Yu-Sheng Tsai Fuh-Shyang Juang |
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Institution: | (1) Institute of Electro-Optical and Materials Science, National Formosa University, Huwei Township, Yunlin County, 632, Taiwan;(2) Department of Electrical Engineering, Hsiuping Institute of Technology, Dali City, Taichung County, 412, Taiwan |
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Abstract: | Light emitting diode (LED) has more advantages compared with a traditional incandescent light bulb and a fluorescent lamp,
such as small size, low quantity of heat, long life, low power consumption, fast response, plain packaging and ease of develop
ment of a frivolous short product. A methodology is proposed to improve the uniformity of the LED illumination system. As
a light source in a backlight unit (BLU), the requirement for optical characteristics of a LED is different from highly directional
conventional ones. New diffused-type LEDs need to be developed to fulfill the requirement of the BLU industry. A non-spherical
lens is designed to optimize uniformity, and a great improvement in uniformity from 28.4 to 64% is demonstrated. In the future,
it may used in an LED display to improve the unevenness of illumination. |
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Keywords: | light emitting diode lens design simulation LED lens uniformity |
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