3.5 Inch Color E Ink Panel for Electronic Shelf Labels

3.5 Inch Color E Ink Panel for Electronic Shelf Labels

A narrow 184×384 SPI display for compact retail tags and static information.

The 3.5 Inch Color E Ink Panel is a reflective display component for electronic shelf labels, smart retail price cards, warehouse tags, and other information products that update intermittently. Its narrow 184×384 pixel format, 38.18 × 79.68 mm active area, SPI control, and slim 45.03 × 91.75 × 1.0 mm structure support compact label designs with more visual content than a basic monochrome segment display.

This is a bare panel, not a complete wireless ESL with a battery, radio, controller, enclosure, or retail-management platform.

Key Specifications at a Glance

The final pin definition, voltage limits, color combination, refresh behavior, waveform resources, and environmental grade must be defined in the approved module documentation.

Product Overview

The tall, narrow pixel layout is suitable for labels that combine a price, product name, promotional area, stock status, barcode, or short product description. The 1.0 mm panel thickness also supports housings where front-to-back space is limited.

Electronic paper retains a static image without continuous panel-driving power. The completed device still requires energy for image updates, wireless communication, processing, memory, and power management.

Four-color artwork planning

A four-color panel provides more information hierarchy than a monochrome display, but it should not be treated as a conventional full-color screen. Artwork must be adapted to the panel’s supported color states.

Pricing, warning blocks, product categories, and promotions can use separate colors, while primary text, borders, and barcodes should use the highest-contrast available state.

Native 184×384 content

Artwork should be generated at 184×384 pixels. Font weight, line thickness, barcode width, QR-code size, image dithering, and color separation should be tested on physical samples.

Narrow label format

The 38.18 × 79.68 mm active area suits vertically oriented shelf tags, product identifiers, logistics labels, and status markers where horizontal space is restricted.

Electronic Shelf Label Integration

The 3.5 Inch Color E Ink Panel can form the visual element of an electronic shelf label, but it does not provide the complete ESL architecture.

A finished system also requires host electronics, battery or another power supply, wireless communications, an enclosure, attachment hardware, firmware, and a management platform.

Retail information layout

Suitable content can include:

• Product and brand names
• Standard and promotional pricing
• Unit-price information
• Product identifiers
• Barcodes and suitably sized QR codes
• Stock or replenishment status
• Shelf-location information
• Limited-color promotion graphics

Actual readability depends on the selected font, panel orientation, viewing distance, color combination, and protective window.

Wireless-system boundary

SPI is a local board-level interface. It does not establish Bluetooth, Wi-Fi, NFC, RFID, infrared, sub-GHz, or proprietary ESL-network compatibility.

Wireless connectivity must be supplied by the finished label electronics.

Static and occasional updates

E Ink panels are best suited to information that remains unchanged for meaningful periods. This panel should not be positioned for video, smooth animation, or continuously changing graphics.

SPI Compatibility and JD79667AA

The SPI designation does not guarantee compatibility with a particular microcontroller, controller board, FPC connector, or software library.

Host integration depends on the complete signal assignment, supply requirements, serial timing, data format, busy signaling, reset behavior, waveform resources, and refresh sequence.

Connector and signal checks

Before finalizing the host board, confirm:

• FPC pin count and pitch
• Contact side and insertion orientation
• Supply and panel-driving voltage requirements
• SPI clock and chip-select behavior
• Reset and busy-signal handling
• Data/command control
• Image-buffer organization
• Ground and unused-pin treatment
• FPC routing and bend clearance

JD79667AA role boundary

JD79667AA is identified as the driver IC. That identification alone does not establish a universal initialization sequence, register map, waveform table, power sequence, or software-library match.

The complete module specification must control the host implementation.

Other video interfaces

HDMI, MIPI DSI, LVDS, eDP, USB video, and parallel RGB cannot drive this raw panel directly. They require conversion and an electronic-paper controller capable of generating the required update process.

Mechanical Fit of the 3.5 Inch Color E Ink Panel

The active image area measures 38.18 × 79.68 mm. The panel outline is 45.03 × 91.75 × 1.0 mm, creating a compact, narrow structure for shelf-label housings and embedded tags.

Enclosure opening

The front window should follow the approved mechanical drawing. Designing the bezel only from the active area may obscure pixels or expose vulnerable border structures.

Flexible-connector routing

Allow room for the FPC exit, connector insertion, locking mechanism, and bend radius. Avoid sharp folds, pressure from fasteners, and adhesive contact with the active panel or rear components.

Front protection

No cover lens, abrasion grade, impact rating, ingress protection, or cleaning-chemical resistance is confirmed. Retail and logistics applications may require a separate protective front window and enclosure.

Refresh, Power, and Environmental Boundaries

No refresh duration, partial-update capability, ghosting grade, update lifetime, voltage, current, or battery-life value is confirmed.

The 3.5 Inch Color E Ink Panel can retain static content without continuous panel-driving power, but finished-device battery performance depends on refresh frequency, wireless activity, host design, battery capacity, software behavior, and environmental conditions.

No operating-temperature or storage-temperature range is confirmed. Refrigerated shelves, freezers, outdoor installations, vehicles, and harsh industrial environments require separate qualification.

Direct-sunlight readability is not claimed solely from the reflective display principle.

Recommended Applications

Suitable integration routes include:

• Electronic shelf labels
• Smart retail price cards
• Promotion and discount tags
• Warehouse inventory labels
• Reusable logistics labels
• Product-identification signs
• Room or asset-status tags
• Low-update-rate IoT indicators
• Narrow equipment information labels

Medical, outdoor, refrigerated, vehicle, and safety-critical applications require separate system-level review.

Customization and Procurement Scope

Project evaluation may cover resolution variants, FPC or connector definition, mechanical adaptation, waveform or controller support, color-artwork preparation, front protection, packaging, and integration with a customer-designed ESL platform.

Commercial quantities, tooling, material availability, and sample terms are confirmed separately for the requested configuration.

Procurement and Sample Approval Checklist

Confirm:

• Required four-color version
• Native 184×384 artwork
• SPI host architecture
• Exact FPC pin assignment
• Supply voltage and timing
• FPC contact side and orientation
• Reset, busy, and data/command signaling
• JD79667AA module requirements
• Full and partial refresh expectations
• Waveform and controller resources
• 38.18 × 79.68 mm active-area orientation
• 45.03 × 91.75 × 1.0 mm enclosure fit
• Front protection
• Operating environment
• Sample quantity
• Estimated annual demand
• Production timing