LED背光设计面临的挑战与对策
背光液晶显示板有很多可能,包括白炽灯、电致发光、荧光、发光二极管和编织纤维光学。选择通常取决于外观与成本和特征。固态照明是主要的选择,因为它拥有比LCD背光的冷阴极荧光灯更好的亮度和功率效率(CCFL)。LED背光照明的主要优点是成本低、寿命长。
最早的LED背光设计采用直接照明,在显示屏后面安装了大量的LED。这些产品由于其优良的图像质量和执行局部调光的能力,由于成本高,未能获得市场份额。三星,其次是其他平板制造商,然后采用边缘式LED背光有早期的成功,在很大程度上是由于边缘点亮LED背光功能的超薄设计,在某些情况下,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)
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