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Small rectangular e-ink module, 2.9 inch black white screen, gold pin header, green PCB border

WaveShare

WaveShare 2.9inch E-Ink Display 296x128 Black White SPI

SKU CH-DX4C-NE3WD

A 2.9inch black-and-white e-paper screen with 296×128 resolution, SPI interface, partial refresh and ultra-low power draw for shelf labels or instruments

  • CPU TypeOther
  • Ultra-low power draw, only 26.4mW during refresh
  • Partial refresh in 0.3s for fast updates
  • Wide viewing angle, clear image without backlight
  • SPI interface with 3.3V/5V logic compatibility
  • Retains display content indefinitely when powered off

2.9″ E-Ink Display for Embedded Projects

The 2.9inch e-paper module delivers a 296x128 pixel black-and-white image with an embedded controller and SPI interface. It suits developers building shelf labels, industrial instruments or IoT nodes that need readable output without constant power. Two-colour output and ultra-low consumption make it practical for battery-operated or energy-harvesting designs.

SPI Wiring and Voltage Translation

Onboard level shifting allows direct connection to 3.3V or 5V microcontrollers using either 3-wire or 4-wire SPI. The compact 89.5mm × 38mm outline fits tight enclosures, and the 0.138mm dot pitch keeps text sharp. Partial refresh completes in 0.3s, while a full screen update takes 2s, so software must budget refresh cycles accordingly.

Sustained Operation Without Backlight

Power is drawn only during refresh events; typical refresh consumption is 26.4mW and standby current is negligible. The panel retains the last image indefinitely after power removal, so long-term deployments stay readable during supply interruptions. Wide viewing angle ensures legibility from off-axis positions in mounted equipment.

Highlights

  • Ultra-low power draw, only 26.4mW during refresh
  • Partial refresh in 0.3s for fast updates
  • Wide viewing angle, clear image without backlight
  • SPI interface with 3.3V/5V logic compatibility
  • Retains display content indefinitely when powered off

Specifications

CPU TypeOther

Questions about this item

How can I confirm the 2.9inch E-Ink display is working correctly after wiring it via SPI?

Send a test image over the 3-wire or 4-wire SPI bus; the 296x128 black-and-white panel should fully refresh in about 2 seconds and a partial update in roughly 0.3 seconds, then retain the image with no power applied.

What comes in the box and what must I source separately for the 2.9inch E-Ink module?

The module includes the 2.9inch 296x128 panel with onboard voltage translator for 3.3V or 5V MCUs; you will need to provide a host board such as a Raspberry Pi, Jetson Nano, Arduino or Nucleo plus the SPI wiring.

Which SPI variant should I choose for the 2.9inch E-Ink display — 3-wire or 4-wire?

Both 3-wire and 4-wire SPI are supported on the same module; select 4-wire for simpler software timing or 3-wire to save one GPIO pin on your 3.3V or 5V microcontroller.

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