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Design of High Light Direct Type LED BLU for Semi-Outdoor LCD

FAN Man-ning1,2,ZHANG Guo-yi1,HAO Mao-sheng2,CHEN Yun-feng2(1.Physics Institute,Beijing University,Beijing 100871,China2.IRICO Group Shanghai Epilight Ltd.,Shanghai 201210,China)  
A 117 cm(46 in) direct type BLU for semi-outdoor LCD is designed.Using 0.5 W High-Ra LED and without the packaging lens,the optical length can be within 25 mm and the centre lightness can be above 20 000 cd/m2.By optical,drive and thermal design,a direct type BLU design is implemented with feature of high lightness,nice display quality,good heat dissipation and low-cost,giving strong support to outdoor and semi-outdoor LCD-Exhibit use.
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