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The original poster in the thread was suggesting that if power usage were low enough, it could be powered by the power provided by the NFC in the phone; where t
by lambda 3y ago
The original poster in the thread was suggesting that if power usage were low enough, it could be powered by the power provided by the NFC in the phone; where the phone provides power for an NFC circuit that is entirely unpowered. If you could power an eink display that way, you could have a completely unpowered frame, which you could set via NFC.
So yes, of course NFC can be isolated from the displays power usage, the originator of this thread was just suggesting it would be neat if you could power it via NFC.
But NFC doesn't provide nearly enough power, nor likely enough bandwidth to do that in a reasonable amount of time.
- rtkwe 3y agoIn theory you could maybe charge a supercapacitor over time with the power from NFC and then perform the update but you're looking at at least 15x (50mW vs 750mW average update draw) the update time standing there holding the phone to the display while you trickle power over that connection. In reality with losses and extra draws to manage the screen you might not break net positive on the energy from the phone or you'd be looking at a 30-50x multiple instead of /just/ 15x.