The fact OnePlus added an in-display fingerprint scanner to the OnePlus 6T was a big deal. It wasn't the first company to integrate such a feature, nor was it the first one to launch a flagship with one, but it did make it nice and affordable. In fact the 6T was only £10 more than the OnePlus 6, which we can all agree is a good thing.
Sadly the scanner was noticeably slower, and I found mapping a full fingerprint could be tricky. Thankfully, according to OnePlus, the system is designed to improve the more you use it.
A post on the OnePlus forums talks about the company's 'Screen Unlock' feature in great detail, talking about the origins of the technology and how the light-based sensor actually works. Interestingly OnePlus also confirmed that it's designed to improve the more you use it, meaning it gets faster and more accurate all the time. So Says OnePlus engineer Yale Wiu anyway:
“Every time a user successfully unlocks the phone with their fingerprint, the sensor also records areas of the finger that weren't registered in the initial fingerprint setup stage. This fingerprint data is then added to the data the phone already holds, making it more complete. So, every time the in-display fingerprint sensor is used, it gathers more data about the user’s fingerprint. This means that over time, the phone will unlock even faster.
“The sensor’s algorithms are also able to figure out when the user’s fingerprint is different than usual – if their finger is wet or if they have a cut on it, etc. In these cases, once the phone is successfully unlocked, the algorithms add this new fingerprint data to the existing data to improve unlock speeds under these conditions in the future.”
So Screen unlock can learn, and if you struggle to map every area of your fingerprint the first time around the 6T can compensate and pick up more information with each subsequent use. That means it gets easier to unlock the phone using the in-display sensor, and ensure that there are no unnecessary delays because your finger/thumb was slightly misaligned. [OnePlus via Android Police]