Many rumors have suggested that the Galaxy S5 will feature fingerprint scanning technology, while others have indicated that Samsung will go the extra mile and settle for the more advanced iris (eye) scanning instead, with a Samsung official going as far as confirming that the company has been considering iris recognition functionality. However, according to a report by the The Korea Herald, the Galaxy S5 will only have a fingerprint sensor, as iris sensor tech is simply too immature at this point.
According to the report, Samsung will be implementing the fingerprint sensor under the display so that users can scan their fingerprints on the screen, as opposed to using the home button like Apple has on the iPhone 5s. As for the iris scanner, an unnamed industry source is quoted as saying: “Who would want to put their handset up close to their eyes for authentication in places like movie theaters and bed, or even while they are driving?” Another source reportedly said that including an iris sensor now will require Samsung to add an additional camera sensor on the device, which would make it thicker, so it probably won't be until the Galaxy Note 4 or Galaxy S6 that we get the option to unlock our phones by simply looking at them.
