对于当前的智能手机市场，手机的屏幕越做越大，从屏占比的计算公式可以看出，屏幕越大，则屏占比越大.PI是pixels per inch的缩写简称,表示的是每英寸显示屏所拥有的像素(pixel)数目-For the current smart phone market, mobile phone screen is bigger and bigger, the formula for calculating the proportion of the screen can be seen, the