LCD 的分类和显示原理
http://hi.baidu.com/hieda/blog/item/bde4de0f0845a3e9aa64576a.html LCD Short for l iquid c rystal d isplay , a type of display used in digital watches and many portable computers . LCD displays utilize two sheets of polarizing material with a liquid crystal solution between them. An electric current passed through the liquid causes the crystals to align so that light cannot pass through them. Each crystal, therefore, is like a shutter, either allowing light to pass through or blocking the light. Monochrome LCD images usually appear as blue or dark gray images on top of a grayish-white