它是描述在水平的和垂直的方向上，每英寸距离的图像包含的像素（pixel）数目。
为了便于比较，一款1080p标准，60英寸大屏幕的高清电视设备，它的分辨率仅略超过36像素每英寸。
For comparison purposes, a 1080p HDTV set with a 60-inch screen has a resolution of a little over 36ppi.
如果将所有的33百万像素的超高画质的（即总所周知的“超高清”）版本都塞进一个22英寸的显示屏幕之中，其图像分辨率将达到令人感叹的400像素每英寸。
If all 33m pixels that the Super Hi-Vision format (known as Ultra HD elsewhere) offers were crammed onto a 22-inch screen, the picture resolution would be an astonishing 400ppi.
一款相对较小的显示器，它拥有一个前所未闻的每英寸200像素的显示屏。
Being relatively small, the screen had a resolution of a then-unheard-of 200 pixels per inch (ppi).
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