Found this in regards to the Note 4 fingerprint scanner. Same goes for the S5. From Sammobile:
Our credible source reports, the Galaxy Note 4 will sport Synaptics Natural ID solution, just like the Galaxy S5 and Galaxy Alpha. Many arent aware of the technologies which come bundled with Synaptics Natural ID solution, one of those technologies is LiveFlex. This technology allows the separation of the fingerprint sensing element from the fingerprint controller integrated circuit. Samsung uses this technology to split the fingerprint sensor into two parts, one part is incorporated into the home button, while the other part takes input from the main touch screen, and both are used simultaneously to get an ID loaded. The sensor is compliant with FIDO, as well.
After the release of the Galaxy S5, many people reported about the fingerprint scanner being crap and useless due to it being unable to correctly identify fingerprints, and most of the time throwing errors instead of unlocking their latest smartphone. The reason behind this is that when registering their fingerprints, users only swipe their finger over the home button, which is tiny and doesnt provide sufficient area. The right way is to swipe their finger starting from the lower part of the display to the home button, not just the home button. This allows for a much greater surface area for the finger to swipe on and the result is flawless. This is actually Samsungs fault and not the users, because these instructions arent present in the current version of the fingerprint registration tutorial. If you didnt knew about this, try it now!
Source:
http://www.sammobile.com/2014/08/25...tics-nature-id-tech-new-fingerprint-features/
Imagine being down the pub with your mates and you all start checking who is the more gashed and having a laugh about it. And then you could market the other side of it too - using it to check whether you can legally drive.
