2.9 Inch 128x296 E Ink Display Module SSD1680 Driver 4-SPI 24 Pin Shelf Label Screen

Electronic paper works because pigment carries charge. Each microcapsule holds a clear fluid with positively charged white particles and negatively charged black ones, plus red or yellow in the colour builds. A field across the capsule pulls one species to the front surface; when it is removed the particles stay where they landed, so the image is a mechanical state rather than a stored voltage. A shelf label therefore keeps its price for months on a coin cell, with current flowing only while the waveform runs. This 2.9 inch module puts a 128x296 array on a 29.056 x 66.896 mm area, about 112 pixels per inch, driven by the SSD1680 over 3-/4-wire SPI through a 24 pin 0.5 mm FPC. The tall ratio suits a rail label read top to bottom, and the 2.2 to 3.7 V window lets a fading cell keep working instead of dropping off the network.

Supermarket rails show a price and a unit price. Warehouse bins show a SKU and a count. Pharmacy shelves show a reimbursed price. Library shelves show a call number. Museum plinths show a caption. Each is a short vertical card read at 50 cm, changed on a cycle of days.

The 2.9 inch diagonal is the sweet spot for rail hardware: four to five text lines where a 2.13 inch tag carries two, in the same housing width. The SSD1680 keeps firmware identical to smaller tags in the estate, so one base station covers a mixed fleet. The 2.2 to 3.7 V range means a cell at 2.4 V still refreshes, avoiding the mid-quarter replacement cycle fixed-threshold designs suffer. At 1.2 mm it fits behind a plastic rail without a bulge.

The module renders prices, barcodes, unit pricing and colour promotion bands, accepts SPI data, refreshes fully for a new layout and partially for a number change, and holds the frame when power is cut. A tag that misses a radio update still shows the last correct price rather than a blank field.

Deployment: clip the label into the rail, connect the FPC, apply 2.2 to 3.7 V, send the SSD1680 table, set the window, write a frame and refresh fully. Later price edits arrive as partial refreshes. Repeat a full refresh after a battery change, because a partial frame on settled pigment leaves a seam.

The 0 to +50 C window excludes freezer cabinets, so confirm the housing before a cold aisle rollout. Keep the FPC tail straight when clipping, never press the film with a thumb to seat the label, and keep cleaning fluid away from the edge seal. A tag that shows a faint ghost of the previous price needs a full refresh, not a new battery.

Shipments leave 5-10 working days after payment, consolidated per store or distribution centre. Pilot aisles go by express, chain rollouts by air or sea, and monthly capacity near 100,000 pieces supports phased openings.

T/T, L/C at sight and Western Union are accepted. Trials are prepaid, rollouts run on a deposit plus balance against documents, and repeat orders release against purchase orders.

Tags ship with protective film in anti-static trays, cushioned with bubble film and sealed in a moisture barrier bag inside an export carton labelled by store or SKU range for easy splitting.

Minimum order is 10 pieces, enough to test a rail. Transit damage or first power-up failure is replaced after photo verification, a 12 month warranty applies, and our team supports label templates and access point mapping.