• sales

    +86-0755-88291180

4.2inch e-Paper Module (B)

Introduction


Note:
 The raw panel require a driver board, If you are the first time use this e-Paper, we recommend you to buy the HAT version or buy more one driver hat for easy use, otherwise you need to make the driver board yourself. And this instruction is based on the version with PCB or driver board.

400x300, 4.2inch E-Ink display module, three-color, SPI interface


Interfaces


VCC3.3V
GNDGND
DINSPI MOSI
CLKSPI SCK
CSSPI chip select (Low active)
DCData/Command control pin (High for data, and low for command)
RSTExternal reset pin (Low for reset)
BUSYBusy state output pin (Low for busy)


Working principle


Introduction


This product is an E-paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny spheres, in which the charged color pigments are suspending in the transparent oil and would move depending on the electronic charge. The E-paper screen display patterns by reflecting the ambient light, so it has no background light requirement. Under sunshine, the E-paper screen still has high visibility with a wide viewing angle of 180 degree. It is the ideal choice for E-reading.


Communication protocol




Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement.

  • CS is slave chip select, when CS is low, the chip is enabled.
  • DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
  • SCLK is the SPI communication clock.
  • SDIN is the data line from the master to the slave in SPI communication.

SPI communication has data transfer timing, which is combined by CPHA and CPOL.

  1. CPOL determines the level of the serial synchronous clock at idle state. When CPOL = 0, the level is Low. However, CPOL has little effect to the transmission.
  2. CPHA determines whether data is collected at the first clock edge or at the second clock edge of serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.
  • There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0.

As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. In here, SPI0 is in used, and data is transferred by bits, MSB first.


TAG: 1.3inch LCD RP2040-PiZero Game ST7789 Raspberry Pi Pico LCD Display Screen Raspberry Pi Thermal imaging camera ESP32 S3 Development Board 1.43 inch AMOLED Display 1.43inch TouchScreen For Arduino LVGL With SD-Port/ QMI8658C 6-Axis Sensor Raspberry Pi 5 CR2032 101M-8001280-IPS-CT-K User Guide Raspberry Pi 500 (US) refined personal computer.built into a high-quality Keyboard Modbus RTU 8-ch Relay Module (D) AURORA AI Laser Radar And Dual Eye Camera IMU Integrated Positioning Map For Android/ROS+RoboStudio 3.52 inch e-Paper HAT B E Ink Red/Black/White 360x240 Screen Display For Arduino /Raspberry Pi /Jetson Nano /STM32 Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 ESP32-S3 1.28inch Raspberry Pi 5 POE + PCIe to M.2 NVMe SSD Board HAT+ Pi5 2242/2230 Power over Ethernet Raspberry Pi Pico Display Raspberry Pi 5 Power Core3566104032 Milk-V Duo Tutorial Raspberry Pi 8 inch DSI LCD Display With 5MP Front Camera MIPI 800×480 Capacitive TouchScreen 0.96inch1.3inch1.44inch1.8inch LCD Display Screen Round Arduino Raspberry Pi ESP32 Pico STM32 IMX462 Raspberry Pi 12.3 inch LCD HDMI /Type C Display In-Cell Capacitive TouchScreen 1920x720 For Jetson Nano/mini Computer PC