Just got the e-ink sheet in today. It does work via NFC with a surprisingly good read/write. I’m able to write from my iPhoneXs with case removed. The image quality is pretty good and has strong color. There is no power supply with the e-ink and it is entirely powered with the NFC device that is sending the information. The bistability of the e-ink holds steady and keeps the image “Locked” for lack of a better word until it is refreshed with a new image. The refresh is only three cycles as far as I can tell but it does a very good job of removing the previous image.
When it comes to viability through the skin I am unsure if it will show through.
Even when obscured with a clear white piece of paper there is little to no discernible image that shows through. I will still try some additional testing and even potentially still acquire some porcine skin to test. I don’t know if e-ink would be viable without a backlight; and that leads back to having a battery/ Permanent power supply issue.
I want to see is even possible setting the image to a thick black set of lines will allow enough contrast to show through skin, or even to show through when illuminated from the front.
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