• sales

    +86-0755-88291180

4.2inch e-Paper Module (C)

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: Raspberry Pi 5 Camera User Guide Raspberry Pi Monitor Official Original DisplayScreen 15.6 inch LCD Full HD 1920x1080 15.6inch Raspberry-Pi-Pico-W-webserver UART Raspberry Pi AF Camera Raspberry Pi OpenWrt Tutorial 2 Industrial USB TO RS232/485 Serial UART Converter FT232RNL Compact Size 0.85inch LCD RTL8723 WIFI SDIO Expansion Module Board For Luckfox Pico Mini B /Luckfox Pico Plus /Luckfox Pico Pro /Luckfox Pico Max LuckFox ESP32 ST7789 configuration ESP32 UART USB Bus Servo ST RSBL Driver board For Raspberry PI Robot Milk-V Duo RJ45 Tutorial Raspberry Pi MLX90641 MPUUART Raspberry Pi 5 PCIe to ISO 2-CH RS485 /2-CH RS232 / USB /UART / TTL 3D Display Transparent Screen TTL UART To CAN Raspberry Pi 5 UPS HAT E 4-Port For 21700-Li-Battery (NOT includ) 5V6A Uninterruptible Power Supply SpotPear Raspberry Pi 5 PCIe to SSD