https://qooah.com/2012/03/27/amoled-%e7%83%99%e5%8d%b0%e7%9a%84%e5%bd%a2%e6%88%90-%e5%8f%8a-%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95/