– NFC powers and transmits data to e-paper displays, which only need energy to change content.
– The 2.9-inch Waveshare display costs $28, supports red/yellow/black/white pixels, and refreshes in ~16 seconds.
– Potential uses include name tags and retail, but manual smartphone-based updates limit practicality for large-scale retail.
– E-paper retains images for months without continuous power, though it is not permanent.
– Centralized wireless updates are more practical for retail than per-device smartphone connections.
NFC is a well-established method for data transmission, typically used to transfer only small amounts of data. It operates via electromagnetic waves—and therefore energy—which a new compact display from Waveshare takes full advantage of. This approach works because e-paper displays only require power when changing their content, as long as no backlight is used. In simple terms, once the digital ink is arranged, the image remains stable for a long time without a continuous power supply. “Stable” does not mean permanent, but rather that the content can remain unchanged for months.
Specifications and Pricing Details
The $28 Waveshare 2.9-inch NFC-powered e-paper display (34751) uses a compatible smartphone to receive both the energy required to update the image and the image data itself. This process relies on NFC in combination with an app. The display supports red, yellow, black, and white pixels, with a resolution of 296 × 128 pixels. The device measures 87.50 × 47.70 millimetres and is 12.70 millimetres thick.
Potential Use Cases and Limitations
Potential use cases include name tags, and Waveshare also promotes the display for retail applications. However, its practicality in larger retail environments is questionable. Refreshing the display takes around 16 seconds (excluding data transfer time), and a direct connection to a smartphone is required. While e-paper price tags are becoming more common in retail, they are typically updated wirelessly and centrally, avoiding the significant labour costs associated with manual updates.
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