1. Nonspherical LED packaging lens for uniformity improvement
- Author
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Yu-Cheng Chang, Yu-Sheng Tsai, Chung-Jen Ou, and Fuh-Shyang Juang
- Subjects
Incandescent light bulb ,Materials science ,business.industry ,Backlight ,Atomic and Molecular Physics, and Optics ,law.invention ,Lens (optics) ,Optics ,Light source ,law ,visual_art ,visual_art.visual_art_medium ,Optoelectronics ,Led packaging ,business ,LED display ,Fluorescent lamp ,Light-emitting diode - 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.
- Published
- 2009
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