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New Label Changes Displayed Price Data With Power from RFID

Powercast's new Batteryless Electronic UHF Retail Price Tag receives pricing information from an RFID interrogator, while also harvesting the RF energy, then uses that energy to change the price accordingly on its display.
By Claire Swedberg
Jun 11, 2018

Powercast is releasing a new power-harvesting RFID label this year, known as the Batteryless Electronic UHF Retail Price Tag, that enables RFID-based updating of electronic paper (e-paper) information, such as prices for retailer shelves. The company is partnering with systems integrators that could develop their own solution for stores.

The "power-over-distance" wireless charging price tag has a built-in UHF RFID transponder and an E Ink display screen, as well as Powercast's PCC110 Powerharvester chip. When interrogated, the label can not only follow a command sent by that interrogator—such as changing pricing information—but it also uses RF-to-DC power harvesting to enable those actions, says Charles Greene, Powercast's COO and CTO.

In 2017, Powercast released an RFID sensor tag known as the PCT100, which uses the power of an interrogator to energize sensors and respond with sensor data via a UHF transmission. The tag can include temperature, humidity and light sensors (see Powercast Aims RF-based Charging Kit at Consumer Goods).

Powercast's latest product takes aim at the retail market, however. Many retailers, especially large chain companies, change their prices and other descriptive data on shelf labels on a regular basis, often company-wide. A store headquarters assigns a new price, such as a temporary discount, and locations across a particular region, or the entire United States, must then go about changing those prices.

When paper shelf labels are used, new labels must be printed and manually replaced. Electronic shelf labels offer an alternative, the company reports. Electronic shelf labels can be expensive, and most are wired to enable communication with a back-end server that sends pricing updates. Alternatively, the labels could include batteries to power the capture and display of RFID-based data, but those batteries would then need to be replaced—and if there were thousands of labels in use at a large store, keeping track of the batteries could be an exhaustive process.

With Powercast's battery-less price label, a store associate requires only a handheld reader that stores pricing data or can access that information via a Wi-Fi connection. Stores could configure the software in a multitude of ways, such as linking each unique ID number on a label with a specific product, so that the new prices could be linked to that ID during interrogation. Conversely, stores could link changes to a zone of products—for instance, a handheld reader could access prices for a particular department (housewares, for example) by reading a tag ID dedicated to that zone. Scanning bar codes would be another alternative to link a specific zone or stock-keeping unit (SKU) to specific price changes, Greene says.

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