New E-Ink display powered by NFC signal energy and no battery needed

Waveshare introduced a 7.5-inch display using E-Ink technology, which does not have its own power sources and works only due to the received NFC signal. It is ideal for displaying text or images that need to be changed remotely, but not often. For example, on an advertising stand, an information board in public transport, a screen with a number in the queue at a bank or hospital, etc.

Electronic ink technology is good because it does not need energy to preserve the color of pixels. It is enough to pass a single control pulse through the matrix, so that specific pixels change color and form a new picture. It will be displayed until the next impulse appears, which will bring both the team and energy for its implementation.

The energy source in this case is the NFC wireless module itself. The fact is that this technology is very similar to wireless charging - the sender of the signal is the radio-frequency field generator, and the receiver has a small spiral antenna for receiving it. This allows you to transfer enough energy to activate the E-Ink display. Waveshare says that any device with an NFC module with a power of 1.4 watts or more, for example, the 2016 Samsung Galaxy S7 Edge, is suitable for this technology.

The NFC data rate limit is only 424 kbit / s, as the technology was designed to transmit short data packets, such as a credit card number or URL. Transferring an image in 800x400 resolution taking into account the screen refresh time may take up to 5-10 seconds. Also, the technology does not work on the iPhone, since Apple added NFC support only in the latest version of iOS and applications for it have not yet been created.

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