Xiaomi captured people's imagination with the "bezel-less" Mi Mix - a spark of true innovation in a time when smartphone design has become very stale. But we want to dispute Xiaomi's claims of 91.3% screen-to-body ratio. Here's the thing. We took this official image (left) and measured it in Photoshop - both the phone and its screen (if you want details on how: we used the tool that counts the selected pixels). Indeed we got pretty close to the claimed 91.3% number, but while we were zoomed in on the image, we noticed that the digitally-rendered view of the Xiaomi Mi Mix does not...
Source: http://www.gsmarena.com/xiaomi_mi_mix_the_truth_about_its_screentobody_ratio-news-21331.php