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WSAL16711 – 7.8inch e-Paper HAT/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

Technical overview of the 7.8inch e-Paper HAT with IT8951 driver: 1872×1404 resolution, connection to Raspberry Pi via SPI/USB/I80, and safe-use notes.

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Technical overview

  • Resolution: 1872 × 1404 pixels; display area approx. 158.2 mm × 118.6 mm
  • Driver: embedded IT8951 controller on the HAT
  • Interfaces: USB, SPI, and I80 for connecting to host boards such as Raspberry Pi or Nucleo
  • Operating voltage: 5 V
  • Color palette: black and white; grayscale from 2 to 16 levels (1–4 bit)
  • Full refresh takes approximately 450 ms (typical)
  • Refresh power typical 1.2 W; standby power typical 0.1 W
  • Viewing angle >170°
  • Operating temperature 0–50 °C; storage temperature -25–70 °C

Commands and examples – verify before use:  

sudo raspi-config # Interfacing Options -> P4 -> SPI -> Yes
sudo nano /boot/config.txt # add dtoverlay=spi0-0cs if using lg/gpiod
sudo reboot
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz && tar zxvf bcm2835-1.60.tar.gz && cd bcm2835-1.60 && ./configure && make && sudo make check && sudo make install
wget https://github.com/joan2937/lg/archive/master.zip && unzip master.zip && cd lg-master && make && sudo make install
sudo apt-get update && sudo apt install gpiod libgpiod-dev
sudo wget https://files.waveshare.com/upload/8/80/IT8951_20200319_Release.7z && 7z x IT8951_20200319_Release.7z -O./IT8951 && cd IT8951/ && sudo make clean && sudo make -j4
git clone https://github.com/waveshare/IT8951-ePaper.git && cd IT8951-ePaper/Raspberry && sudo make clean && sudo make -j4
sudo ./epd -1.50 0

Notes and version constraints

  • The glass panel and FPC connector are fragile; when developing, reinforce the FPC with tape
  • All cables must be connected before powering on – the device does not support hot-plugging
  • Two versions exist: raw panel (requires separate IT8951 driver board) and HAT version (with driver board); the HAT version is recommended for first-time users
  • Refresh time and power figures are measured values that may vary with environment
  • In low-temperature environments, color cast may occur; allow 6 hours at 25 °C before refreshing
  • Avoid direct sunlight; take UV protection measures because charged particles can dry out under strong light (irreversible)
  • Update the display at least every 24 hours to avoid burn-in
  • After prolonged high-voltage states, set the screen to sleep mode or power off after each refresh to prevent burn-out
  • E-LINK-TCON-DEMO source code requires signing an NDA with the Waveshare team and is currently unavailable to individual users

Source and revision record

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