Xiaomi has been slower to adopt in-display fingerprint sensors than some of its Chinese rivals, only including the feature on certain high-end variants of last year’s Mi 8 flagship phone. But according to a Weibo post by president and co-founder Lin Bin, the company is working on a much more advanced implementation of the technology.

Lin’s post includes a video demonstrating a prototype phone with a new fingerprint sensor that has an active area of 25 x 50mm, meaning users could unlock it by tapping anywhere within a much larger region than the thumbprint-sized scanners found on several phones released last year. It would represent a boon for usability, particularly since you wouldn’t have to look for the physical location of the scanner…

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