Electronic paper that switches screen display by power supply from NFC without battery
One of the features of electronic paper is 'low power consumption'. Most of the consumption only occurs at the time of switching the display, so it is OK even if the battery capacity in the main unit is not so large. Waveshare's 7.5-inch electronic paper is designed to be quite simple, with no battery and no AC adapter, based on the idea that power consumption can be provided by
7.5inch NFC-Powered e-Paper-Waveshare Wiki
https://www.waveshare.com/wiki/7.5inch_NFC-Powered_e-Paper
4.2 'and 7.5' NFC-powered e-Paper Displays Work without Battery
https://www.cnx-software.com/2020/03/17/nfc-powered-e-paper-displays-work-without-battery/
The actual operation can be grasped by a movie published on YouTube.
Waveshare 7.5inch NFC Powered e Paper-YouTube
The terminal looks like this.
The left and right viewing angles are 170 degrees, so you can check the display content from almost right beside. The screen resolution is 800 x 400 pixels and the display color is black and white. The screen update time is a little longer at 5 seconds, excluding the time required for data communication.
Launch the NFC tag app on your smartphone, specify an image, and transfer it over the display.
After a few seconds, the display changes.
The transferred image is displayed.
It is also possible to display photos taken with a smartphone camera.
You can apply 'no effect', 'gray effect', 'block effect', 'sketch effect', and 'neon effect' to photos.
Displaying a photo with the gray effect looks like this.
In addition to Pixel, the transfer source terminal seems to be OK if it is an NFC compatible Android terminal such as Samsung, Huawei, Sony, LG, Xiaomi. AliExpress sells for $ 70.19 (about 7500 yen). It takes 13 to 20 days to arrive if it is a regular shipment to Japan without hurry, and the shipping fee is free.
Waveshare 7.5inch Passive NFC Powered e Paper, No Battery, Wireless Powering & Data Transfer | Demo Board | |-AliExpress
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