3.7 Inch Tri Color E Paper Display Panel for Retail Shelf Labels

3.7 Inch Tri Color E Paper Display Panel for Retail Shelf Labels

This reflective 3.7-inch panel presents black, white, and red label content through a 24-pin SPI connection without an integrated backlight.

Product Summary

The Tri Color E Paper Display Panel is a 3.7-inch reflective component for electronic shelf labels, retail price tags, promotional labels, and other low-update information interfaces. It provides a native 240 × 416 portrait canvas with black, white, and red output, allowing product names, prices, barcodes, promotional markers, and status information to be arranged within a compact label format.

The visible area is 47.04 × 81.54 mm, while the panel outline is 53.0 × 92.99 × 0.91 mm. A 24-pin SPI connection links the panel to an external MCU or electronic-paper controller. The standard configuration has no backlight and no touch sensor. Host electronics, wireless communication, power management, waveform files, enclosure, and front protection belong to the finished label system.

Key Specifications

Tri-Color Content Planning

Prepare Black, White, and Red Artwork

The confirmed palette contains black, white, and red. Price numerals, product names, barcodes, and regulatory text can use black against a white background, while red can identify promotions, warnings, or category accents. Artwork should be converted to the supported three-color palette before transmission rather than sent as unrestricted RGB graphics.

Keep critical text and barcode edges free from unnecessary dithering. Red should be used selectively because it is a discrete display color rather than a continuously blended RGB channel. Sample approval should include the actual fonts, barcode sizes, line weights, and promotional icons used by the retail system.

Use the Native 240 × 416 Portrait Canvas

The active area is 47.04 × 81.54 mm, producing a tall label format. Prepare the user interface at the native 240 × 416 raster to avoid resampling small text and barcode lines. The listed pixel pitch is 0.202 × 0.203 mm, so nearly square pixel geometry supports predictable icon and character proportions.

The panel can be installed in portrait or rotated layouts when the host software and mechanical FPC route support the selected orientation. Confirm scan direction and coordinate mapping in the approved controller documentation before final artwork templates are released.

SPI Integration for the Tri Color E Paper Display Panel

Qualify the 24-Pin Host Connection

A 24-pin connector does not guarantee electrical compatibility with another electronic-paper panel. Confirm the complete pin assignment, connector pitch, contact side, FPC orientation, SPI mode, clock timing, chip-select behavior, reset, busy-state handling, power rails, and any generated drive-voltage requirements.

The interface is identified as MCU/SPI, but the exact SPI variant and electrical levels are not fixed by that label alone. The host schematic should be reviewed against the approved pin table and timing specification before PCB release.

Confirm Controller, LUT, and Waveform Files

Electronic-paper updating depends on controller and waveform files matched to the panel, color version, and operating temperature. The confirmed configuration does not identify the driver IC, refresh duration, partial-refresh capability, waveform storage, or required initialization package.

Do not substitute firmware from another 3.7-inch panel solely because the resolution and pin count appear similar. Request the approved initialization code, lookup-table or waveform package, temperature handling, update sequence, and power-down instructions for the ordered version.

Mechanical Integration and Housing Fit

Use the Active Area and Outline Separately

The 47.04 × 81.54 mm active area controls the visible content opening. The 53.0 × 92.99 × 0.91 mm outline controls panel clearance, support, adhesive zones, FPC routing, and assembly tolerance. Do not use the active area as the enclosure cutout without reviewing the complete mechanical drawing.

The 0.91 mm panel thickness supports slim label housings, but the finished assembly also needs space for the controller PCB, battery or wired power, antenna, fasteners, protective front window, and strain relief. Avoid point loading and frame pressure on the active display region.

Design the Front Window for a No-Backlight Panel

This panel has no backlight and relies on ambient illumination. The front window should therefore preserve reflectance and contrast rather than add unnecessary tint or glare. Window material, printing, air gap, surface reflections, and store lighting should be validated with a production-intent sample.

No backlight does not establish a finished outdoor or weatherproof rating. Environmental sealing, UV exposure, impact protection, condensation control, and enclosure certification remain system-level decisions.

Operating Limits and Application Fit

This Tri Color E Paper Display Panel is best suited to electronic shelf labels, retail price tags, promotional cards, inventory labels, reusable logistics tags, room labels, and other applications where information changes periodically rather than continuously.

The operating range is 0°C to +40°C, with storage from −25°C to +60°C. Retail teams should compare those limits with refrigerated areas, heated showcases, loading zones, direct window exposure, and warehouse storage. Dynamic video, rapid animation, touch interaction, and extreme-temperature operation are not established by the confirmed configuration.

Configuration and Customization

Project review may cover FPC length and orientation, pin definition, SPI implementation, controller and waveform support, color version, cover window, enclosure adaptation, artwork, branding, and packaging.

Custom configurations are generally reviewed from 500 pieces, subject to tooling requirements, material availability, and the requested specification. Sample and standard-panel quantities are confirmed separately.

Procurement Checklist

Confirm the following before sample or tooling approval:

• Exact black/white/red panel version and native 240 × 416 orientation
• Complete 24-pin assignment, connector pitch, contact side, and FPC direction
• SPI mode, clock, control signals, reset, busy handling, and timing
• Panel supply and generated drive-voltage requirements
• Approved controller, initialization, LUT, and waveform package
• Full-refresh and any partial-refresh behavior
• Active-area position and 53.0 × 92.99 × 0.91 mm mechanical fit
• Front-window reflectance, glare, and protective requirements
• No-backlight and no-touch system architecture
• 0°C to +40°C operating requirement
• Sample acceptance artwork, quantity, annual demand, and schedule