HMD recently acquired the PureView trademark from Microsoft, but the company is gearing up for even more proprietary features. It filed for trademarks for PureDisplay and "Face Unlock". So, what's PureDisplay? The trademark only makes broad mentions of displays for phones, tablets and computers, HMD is just covering all its bases. Long-time Nokia fans probably remember ClearBlack screens. Those featured a polarizer that reduced glare (the same way that polarized glasses work), which significantly improved sunlight legibility. Or better yet, this could be related to PureMotion HD+...
Source: https://www.gsmarena.com/hmd_trademarks_puredisplay__the_return_of_puremotion_hd-news-32993.php
