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In light-emitting diode (LED) direct-lit backlighting application, it is a critical issue that how to design an optical component to achieve high uniform illumination with large distance–height ratio (DHR) and extended sources. A new feedback reversing design method is proposed to solve this problem, including calculation of feedback optimization ratios (FOR) to achieve uniform illumination for extended...
Nonuniform illumination caused by extended source is one of the challenging points for high power Light-emitting diodes (LEDs) especially for LED array applications. A new design method to improve the uniformity of illuminance of extended source is presented. To obtain high uniformity at target plane, a feedback optimization method is introduced including target plane girds, light source girds and...
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