NFC is usually only used to for quick text transfers, like a tap-and-pay transaction at a register or a quick data transfer from an NFC sticker. A company called “Waveshare” is really pushing the limits of NFC, though, with a 7.5-inch e-ink display that gets its data, and its power, from an NFC transfer. The $70 display doesn’t have a battery and doesn’t need a wired power connection. E-paper (or e-ink) displays have the unique property of not needing power to maintain an image. Once a charge blasts across the display and correctly aligns pixels full of black and white balls, everything will stay where it is when the power turns off, so the image will stick around. You might not have thought about it before, but in addition to data, NFC comes with a tiny wireless power transfer. This display is designed so that NFC provides just enough power to refresh the display during a data transfer, and the e-ink display will hold onto the image afterward.
NFC data transfers max out at a whopping 424 kbit/s. While that’s enough for an instant transfer of credit card data or a URL, the 800×400 image the display needs will take several seconds. Waveshare says the display takes five seconds just to refresh, and that doesn’t count the data transfer, which will vary depending on how complex your image is. The video shows a start-to-finish refresh that takes 10 seconds. If you want to use a phone, an Android app will convert your image into several different black-and-white styles and beam it to the display. Sadly, there’s no iOS app yet. iOS apps didn’t have the ability to write to NFC devices for the longest time. Writing to NFC was added with the launch of iOS 13, which only happened a few months ago.