Apple has patented technology that can detect when your iPhone screen is smudged

Business InsiderApple has patented technology that can detect when your iPhone screen is smudgedBusiness InsiderWhen the iPhone screen has a smudge from your finger, for example, it blocks the path of light back to the phone's sensors. When that happens, your iPhone might think that you are holding your phone up to your head, and then turn off the screen. Or it ...and more »