Quad-Color 4.2 inch e-Paper 400x300 Display w/Arduino Shield,Library

Description

ER-EPD042-2RY-5070 is a 4.2-inch four-color electrophoretic e-Paper (E-Ink) display with a 400×300 pixel format (84.80×63.60 mm active area, 91.00(W)×77.00(H)×1.0(T) mm with FPC folded) rendering white, black, red, and yellow pigments. Because it is reflective e-Paper rather than a backlit LCD, it is sunlight-readable from a true 85°/85°/85°/85° viewing cone, draws only milliamps during image update and microamps in standby, and holds the last image with zero power after refresh—ideal for battery-driven static-content devices that spend most of their life asleep.

Controller, interface and power
ER-EPD042-2RY-5070 integrates the JD79668 all-in-one driver with built-in TCON in COG packaging and talks to the host over 3-wire or 4-wire SPI (SCL, SDA, DC, CSB, RST, BUSY on the 24-pin 0.5 mm ZIF FPC). Logic runs at VDDIO/VDD/AVDD 2.3–3.6 V typ. 3.3 V (absolute max 6.0 V), with an on-chip DC-DC charge pump generating the ±source/gate/VCOM rails (VSP/VSN ±15 V, VSPL +3~+15 V, VGP/VGN ±10~±20 V, VDD_15 1.5 V, VMTP 10.1 V) so no external high-voltage supply is needed. A ±2.0 °C on-chip temperature sensor plus an optional I²C off-chip sensor path (LM75-compatible) support waveform compensation, and the 0.212×0.212 mm dot-pitch bistable pigment cell with built-in 400×300×2-bit frame SRAM needs no frame buffer refresh while idle.

Kit contents, software and handling rules
ER-EPD042-2RY-5070 ships ready to plug in as an Arduino bundle: the bare FPC panel with FFC and a 24-pin ZIF connector mated to an Arduino shield for Uno, Mega 2560, Due, and Nano. We provide JD79668 demo code, SPI waveform libraries, and full-refresh/partial-refresh examples on buydisplay.com. As with all bistable e-Paper, do not leave the panel powered without refreshing—put it to sleep or power off between updates, and run a full refresh regularly to avoid permanent ghosting; partial refresh alone cannot clear accumulated image sticking.

Operating conditions and applications
Rated for 0~+40 ℃ operating and −25~+70 ℃ storage, the module is built for indoor-to-outdoor transit tags, shelf labels, and signage that spend most of their life unpowered. It is not a video-rate display—typical full refresh is seconds, not milliseconds, and refresh should be triggered indoors rather than under direct sun mid-refresh. That makes it suitable for electronic shelf labels, warehouse bin tags, price tags, medical/industrial status cards, smart-home scene labels, and any low-power MCU/SBC project that needs a sunlight-readable 4-color static display with weeks-to-months of battery life per refresh.

To fastly get started, please consider our e-paper panel connected with arduino shield or raspberry pi HAT. Libraries and samples are available for all of them.

Package Content

◇ e-Paper Display Panel x 1

◇ Arduino Shield x 1

◇ FFC Cable x 1

◇ ZIF connector x 1

* Please select if you wish to have optional accessories.

Application

◇ Logistics

◇ Reusable Transit Item

◇ Station Terminal

◇ Smart Card

◇ Smart Identity Tag

◇ Seat Number Tab

◇ Smart Luggage Tag

◇ Smart Coffee Cup

◇ Smart Home Application

◇ Identification & Access

◇ Display the Latest Weather Forecast

◇ Display Your Own Twitter Feed

◇ E-paper room booking system

◇ Other IoT (Internet of Things) Devices

◇ 1D/2D Barcode Electronic Shelf Label

Datasheet

Format	Documents Name	Language	Update Date	Size
	ER-EPD042-2_Datasheet	English	Sep-18-2026	835K
	Controller JD79668_Datasheet	English	Jun-20-2026	2.4M
	Arduino Shield Drawing	English	Jun-14-2019	383K
	24 Pins 0.5mm Pitch ZIF Connector Drawing	English	May-16-2018	268K

Tutorial-Arduino

Format	Documents Name	Language	Update Date	Size
	Arduino Library and Example for 4-wire SPI and SD Card	English	Sep-18-2026	10K
	Arduino Interfacing Document	English	Jul-10-2019	160K