Idea time: RFID+E-Ink, electronic price tags without batteries

I got this idea years ago, somewhere in 2004 after I had heard both of RFID and E-Ink. The order is irrelevant ;) The idea is simple, we take:

1) RFID readers, which send radio waves to tags, which pick up some of the energy in the wave, do some computations and send a reply. The tags are brilliant: no batteries, no connected power source of any kind except for the antenna.

2) E-Ink displays, which need power only to change pixels. After the power is cut off, the pixels remain in their current state.

The result: a small tag with a display. The display gets initialised and updated by an RFID-reader and after that retains its state indefinitely.

Perfect for price tags on shelves in supermarkets, which need to be updated every now and then but are hellish to replace.

I soon found out in 2004 that Epson had already done this:

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