LED背光設(shè)計面臨的挑戰(zhàn)與對策

　　背光液晶顯示板有很多可能，包括白熾燈、電致發(fā)光、熒光、發(fā)光二極管和編織纖維光學(xué)。選擇通常取決于外觀與成本和特征。固態(tài)照明是主要的選擇，因為它擁有比LCD背光的冷陰極熒光燈更好的亮度和功率效率（CCFL）。LED背光照明的主要優(yōu)點是成本低、壽命長。

　　最早的LED背光設(shè)計采用直接照明，在顯示屏后面安裝了大量的LED。這些產(chǎn)品由于其優(yōu)良的圖像質(zhì)量和執(zhí)行局部調(diào)光的能力，由于成本高，未能獲得市場份額。三星，其次是其他平板制造商，然后采用邊緣式LED背光有早期的成功，在很大程度上是由于邊緣點亮LED背光功能的超薄設(shè)計，在某些情況下，小于10毫米。

　　Edge-lit LED backlights allow the set maker to reduce the number of LEDs by concentrating them along the edges. This happened first on all four edges， then moved to two， and eventually to a single short edge. Flat panel television makers have continued to struggle with an LED premium that many consumers are unwilling to pay， especially with continuing rapid erosion of retail prices. In 2011， LED-backlit units accounted for 46 percent of LCD TVs （Figure 1）