2.13inch Touch e-Paper HAT

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2.13inch Touch e-Paper HAT
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2.13inch Touch E-Paper E-Ink Display HAT For Raspberry Pi, 250×122 Pixels, Black / White, SPI Interface
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Specifications

  • Size: 2.13inch
  • Outline dimensions(Module): 69.15 × 38.90mm
  • Outline dimensions(Driver Board): 59.51mm × 34.00mm
  • Display area: 48.55mm × 23.71mm
  • Oerrating Voltage: 3.3V
  • Communication interface: SPI
  • Dot pitch: 0.194 × 0.194mm
  • Resolution: 250×122 pixels
  • Display color: black, white
  • Grey scale: 2
  • Partial refresh time: 0.3s
  • Full refresh time: 2s
  • Refresh power: 26.4mW(typ.)
  • Touch points: 5 (MAX)
  • Touch type: Capacitive touch
  • Touch interfaced: I2C
  • Touch panel: Toughened Glass

【Note】

  • Refresh time: The refresh time is experimental test data, there will have some deviation from the actual refresh time, so please refer to the actual refresh time. The e-paper will flicker during the full refresh process, this is a normal phenomenon.
  • Power consumption: The power consumption data is experimental test data. The actual power consumption will have a certain deviation due to the existence of the driver board and the actual usage. Please refer to the actual refresh power consumption.

SPI Communication protocol

1.54inch-e-paper-manual-1.png

Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has a 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.
  • Timing: CPHL=0， CPOL=0 （SPI0

Working protocoal

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 displays patterns by reflecting the ambient light, so it has no background light requirement. Under ambient light, the E-paper screen still has high visibility with a wide viewing angle of 180 degrees. It is the ideal choice for E-reading. (Note that the e-Paper cannot support updating directly under sunlight)

Pixel & Byte

We define the pixels in a monochrome picture, 0 is black and 1 is white.
White：□，Bit 1
Black：■：Bit 0

  • The dot in the figure is called a pixel. As we know, 1 and 0 are used to define the color, therefore we can use one bit to define the color of one pixel, and 1 byte = 8pixels
  • For example, If we set first 8 pixels to black and the last 8 pixels to white, we show it by codes, they will be 16 bit as below:

E-paper hardware work 1.png
For computer, the data is saved in MSB format:
E-paper hardware work 2.png
So we can use two bytes for 16 pixels.

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