Freya Yang
+86 18318948097
+852 62667476
4.2 Inch Four Color ESL Display Module for Supermarkets
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huisoar
HS042TC06A-V1
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Model P/N
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Viewing Angle
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Designed For
4.2 Inch Four Color ESL Display Module for Supermarkets
This four-color electronic shelf label panel uses a 400 × 300 SPI-controlled image area for compact retail pricing and promotion layouts.
Product Summary
The 4.2 Inch Four Color ESL Display is an electronic-paper component for supermarket labels, retail price cards and promotional shelf information. It presents red, yellow, black and white content on a 400 × 300 pixel canvas, giving label designers separate visual levels for standard text, prices, warnings and promotional emphasis.
The active image area measures 84.8 × 63.6 mm, while the panel outline measures 91.0 × 77.0 × 1.0 mm. SPI supports host control, but pin assignment, supply levels, waveform support and update behavior must be qualified before PCB release.
This product is a display module rather than a complete wireless electronic shelf label. The finished ESL still requires power architecture, host electronics, communications, enclosure, firmware and content-management functions.
Key Specifications
| Parameter | Value |
|---|---|
| Display size | 4.2 inches |
| Display technology | Four-color electronic paper |
| Resolution | 400 × 300 pixels |
| Display colors | Red, yellow, black and white |
| Active area | 84.8 × 63.6 mm |
| Panel outline | 91.0 × 77.0 × 1.0 mm |
| Communication interface | SPI |
| Primary application | Supermarket and retail electronic shelf labels |
| Gray-scale notation | “2 gray scale” shown; implementation requires confirmation |
Four-Color Content Planning for Retail Labels
Native 400 × 300 Artwork
Artwork should be prepared at the native 400 × 300 resolution. Prices, product names, unit information, barcodes and promotional graphics need enough spacing to remain readable after the final label window and border are applied.
Color Mapping for Prices and Promotions
Red and yellow can create emphasis, while black can carry normal pricing, descriptions and barcode information against a white background. The host software must convert artwork into the supported four-color data format rather than sending unrestricted RGB images.
Four-color artwork must be mapped to red, yellow, black and white at 400 × 300 pixels.
Test color conversion with real prices, small text, barcodes and logos because dithering can change fine details.
Two-Gray-Scale Notation Requires Confirmation
The product image includes a “2 gray scale” notation, but that statement does not define pixel encoding, waveform mode or whether gray levels can be combined freely with all four colors.
The “2 gray scale” notation requires confirmation before grayscale content is approved.
Integrating the 4.2 Inch Four Color ESL Display
SPI Host and Waveform Requirements
An SPI interface does not establish pin assignment, voltage, timing or waveform compatibility.
Obtain the FPC definition, connector pitch, contact side, signal names, logic levels, driver documentation and update commands. A generic SPI e-paper library should not be assumed compatible merely because the resolution matches.
Panel Versus Complete ESL System
The panel does not provide a wireless link, battery, gateway connection, retail database integration or protective housing. Those functions belong to the complete electronic shelf label system.
The 91.0 × 77.0 × 1.0 mm panel is a display component rather than a complete wireless ESL.
Low-Power Budget and Update Cycle
The product is positioned as a low-power e-paper module, but no numeric refresh power, standby current, refresh duration or supported update interval is specified for this exact version.
Low-power positioning does not establish a battery-life figure without refresh power, update frequency and controller data.
Include display updates, the host processor, radio, voltage conversion and sleep leakage in the power budget.
Mechanical Fit for Label Housings
Active Area and Panel Outline
The 84.8 × 63.6 mm active area defines the visible content region. The 91.0 × 77.0 × 1.0 mm outline controls the panel cavity, but not the complete finished-label dimensions.
The enclosure drawing should also account for the FPC tail, connector access, tolerances, front window and support surfaces.
Front Window and FPC Routing
A protective front, printed border or sealing structure should be reviewed separately because it can affect visibility, thickness and assembly stress.
The FPC position and bending direction must be checked against the PCB location. Final tooling should use an approved mechanical drawing and physical sample.
Retail Application Fit
A 4.2 Inch Four Color ESL Display can support supermarket price labels, promotional shelf cards, pharmacy category labels, convenience-store tags, reusable inventory identifiers and other low-update retail information products.
The four-color format is useful where normal information and promotional emphasis must share one label. However, the module does not establish the wireless protocol, cloud platform, battery life, update speed, temperature rating or environmental protection of the final ESL.
Customization and Procurement
Project evaluation may cover FPC orientation, connector selection, controller and waveform support, artwork conversion, front-window design, enclosure adaptation, branding and packaging.
Sample and production quantities should be confirmed separately. Test samples with the intended controller, power design, four-color artwork and label enclosure before production approval.
Procurement Checklist
Confirm before sample or production release:
- Exact red, yellow, black and white panel version
- Native 400 × 300 artwork and orientation
- Complete SPI pin assignment and timing
- FPC pitch, contact side, length and routing
- Logic and panel supply requirements
- Driver IC, command set, LUT and waveform files
- Full-refresh time and supported update modes
- Refresh power, sleep current and battery assumptions
- Interpretation of the “2 gray scale” notation
- 84.8 × 63.6 mm active area
- 91.0 × 77.0 × 1.0 mm panel outline
- Front-window opening and enclosure tolerances
- Operating and storage limits
- Sample quantity, annual demand and schedule
FAQ
About 4.2 Inch Four Color ESL Display Module
Is this panel a complete wireless electronic shelf label?
What must be checked before connecting the SPI host?
How should four-color label artwork be prepared?
What information is required to estimate power and update performance?
Which dimensions control the ESL enclosure design?
Freya Yang
+86 18318948097
