2.13inch e-Paper HAT

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Introduction

This is 2.13inch e-Paper module, 250x122 resolution, SPI interface, supports black and white colors.

Features

  • Size： 2.13 inch
  • Dimension（Raw panel）：59.2mm × 29.2mm × 1.05mm
  • Dimension（PCBA）：65mmx30.2mm
  • Display area：48.55mm × 23.71mm
  • Operating voltage：3.3V/5V
  • Interface：SPI
  • Pitch：0.194* 0.194
  • Resolution：250*122
  • Display colors：Black, White
  • Gray scale：2
  • Partial update ：0.3s
  • Fully update ：2s
  • Consumption (refresh) ： 26.4mW(typ.)
  • Consumption (standby) ：<=0.017mW

【Notices】： Update time: The data provided is for reference, the actual time may be different according to the MCU. The e-Paper will flicker when updating, it is normal
Consumption: The data provided is for reference, the actual consumption may be different according to the driver board.

SPI timing

E-paper-spi-timing.jpg

由于墨水屏只需要显示，这里将从机发，主机收的数据线（MISO）隐藏。
CS：从机片选，当CS为低电平的时候，芯片使能
DC：数据/命令控制引脚，当DC=0时写入命令；DC=1时写入数据
SCLK： SPI通信时钟
SDIN：SPI通信主机发送，从机接收
时序：CPHL=0， CPOL=0 （SPI0）
【备注】具体关于SPI通信的相关信息，可以自行网上搜索资料了解

墨水屏刷新原理

像素与字节的关系

对于黑白图片，我们可以规定，如果如果是黑色我们定义成0，如果是白色就定义成1，那么有了表示颜色的方式：
白色：□，对应1
黑色：■：对应0

  • 一个点在图形上一般称之为像素点（pixel）,而颜色不是1就是0，也就是1个位就可以标识颜色：1Pixel = 1bit，那么一个字节里面就包含了8个像素点。
  • 以16个像素点为例，我们假设前8个像素点为黑，后8个像素点为白色，那么可以这么认为，像素点1-16，对应这0位到15位，0表示黑色，1表示白色：

E-paper hardware work 1.png
对于计算机而言，它的数据存储方式是高位在前，低位在后，且一个字节只有8个位，因此会有一点改变：
E-paper hardware work 2.png
这样只需要2个字节即可表示16个像素点了。

使用说明

资料

文档

程序

数据手册

开发资料

FAQ

1、Working requirements of e-Paper?|

  • 【Working】Temperature: 0~50°C; Humidity: 35%~65%RH
  • 【Storage】Temperature: ≤30°C; Humidity: ≤55%RH; Max storage time: 6 months
  • 【Transport】Temperature: -25~70°C; Max transport time: 10 days
  • 【Unpack】Temperature: 20°C±5°C; Humidity: 50%RH±5%RH; Max storage time: Should be assembled in 72h

2、 What do you need to note about e-Paper refreshing

  • Refresh mode
    • Full refresh: e-Paper flicker when full refreshing to remove ghost image for best display.
    • Partial refresh: It doesn't flicker if you use partial refresh (only some of the two-color e-paper support partial refresh). Note that you cannot use Partial refresh all the time, you should full refresh e-paper regularly, otherwise, ghost problem will get worse even damage
  • Refresh rate
    • When using, you should set the update interval at least 180s. (except Partial supportable types)
    • Please set the e-Paper to sleep mode or power off it directly, otherwise, the e-Paper is damaged because of working in high voltage for a long time.
    • You need to update the content of three-color e-Paper at least one time every 24h to avoid the burn-in problem.
  • Working place
    • We recommend you to use the e-Paper indoor. If you need to set the e-paper outdoor, Please place the e-paper in shadow and protect it from UV. When you designed you e-paper product, you should take care about the working situation like temperature, humidity, etc.

3、Why the e-Paper display a black frame？

  • You can configure Border Waveform Control register or VCOM AND DATA INTERVAL SETTING register to change the frame.

4、Could the e-Paper work again after sleeping？

  • You can use the initial function to wake it up and then update.
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