i saw comments about the finger print Samsung use on their phones and it seem that part of the reader is in the lower part of the screen so whe might see something like this first on Samsung products.
If you are referring to fingerprint scanner on Galaxy S5, that is not in the screen but on the home button and it's absolutely garbage compare to the touch ID. You got to swipe on it downwards and you have to do it on the right speed (not too fast or too slow) and you got to use both hands when you do it. The number of times it fails in me is quite high.