Looking a little further into the future, we could see multiple optical image sensors built into displays — or even entire displays featuring the technology, which would mean you could place your finger anywhere on the screen and have your fingerprint read. (techradar.com)
But with a bit of effort, you can make yourself see the entire display as a «whole.» (scientificamerican.com)
I promise you, tandem wearing is WAY EASIER than trying to chase a toddler through the store and make sure she doesn't knock down entire displays or open bags of chips I have no intention on purchasing. (stillbeingmolly.com)