Journal
OPTICAL REVIEW
Volume 16, Issue 3, Pages 323-325Publisher
OPTICAL SOC JAPAN
DOI: 10.1007/s10043-009-0059-7
Keywords
light emitting diode; lens design; simulation; LED lens; uniformity
Categories
Funding
- National Science Council (Taiwan) [NSC96-2221-E-150-025]
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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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