4.2inch e-Paper Module (B) Manual

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4.2inch e-Paper (B)
4.2inch-e-Paper-B-1.jpg

400 x 300, 4.2inch EPD panel
4.2inch e-Paper Module (B)
4.2inch-e-paper-module-b-3.jpg

400 x 300, 4.2inch EPD module, three-color, SPI interface
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Overview

Version

  • V2: Compared with the old version, in addition to the chip and driver, other appearance and function are compatible. If you are the first time to purchase it and there is a V2 label behind the screen, you can directly use V2 demo.
  • V1: use V1 demo.

Parameters

Dimensions 4.2inch
Driver board dimensions 103.0mm × 78.5mm
Display dimensions 84.8mm × 63.6mm
Outline dimensions (screen only) 91mm × 77mm × 1.05mm
Operating voltage 3.3V / 5V (IO level voltage must be consistent with the supply voltage)
Communication interface SPI
Dot pitch 0.212mm × 0.212mm
Resolution 400 × 300
Display color Black, White, Red
Grey scale 2
Refresh time 15s
Refresh power consumption 38.4mW(typ.)
Standby current < 0.01uA (almost 0)
Operating temperature 0 ~ 40 ℃
Storage temperature -25 ~ 60 ℃
  • Refresh time: The refresh time is the experimental results, the actual refresh time will have errors, and the actual effect shall prevail. There will be a flickering effect during the global refresh process, this is a normal phenomenon.
  • Refresh power consumption: The power consumption data is the experimental results. The actual power consumption will have a certain error due to the existence of the driver board and the actual use situation. The actual effect shall prevail.
  • The display color may be biased when refreshing in a low temperature environment, and it needs to be refreshed after 6 hours of rest at 25°C.

Communication Method

4.37inch-e-paper-manual-2.jpg

  • CSB (CS): Slave chip selection signal, low active. When CS is low level, the chip is enabled.
  • SCL (SCK/SCLK): Serial clock signal.
  • D/C (DC): Data/Command control signal, writes commands at a low level; writes data/parameter at a high level.
  • SDA (DIN): Serial data signal.
  • Timing sequence: CPHL=0, CPOL=0 (that is, SPI mode 0).
Note: For specific information about SPI communication, you can search for information online.

Working Principle

  • This product is an e-Paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The basic principle is that the charged nanoparticles suspended in the liquid are subjected to the electric field to produce migration. The e-Paper screen display 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 almost 180 degrees. It is the ideal choice for e-reading.

Program Principle

  • 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: 1pixel = 1bit, and 1 byte = 8pixels
  • For example, If we set the first 8 pixels to black and the last 8 pixels to white, we show it by codes, The pixels 1-16 correspond to the 0 to 15 bits, with 0 representing black and 1 representing white, they will be 16-bit as below:

E-paper hardware work 1.png

  • For a computer, its data storage method is high-order first, low-order later, and a byte has only 8 bits, so there will be a little change:

E-paper hardware work 2.png

  • In this way, only 2 bytes are needed to represent 16 pixels.
  • For 4.2inch e-paper B, which is red, black, and white, we need to split the picture into two pictures, one black and white picture, one red and white picture, because during transmission one register controls black and white display and one register control red and white display. 1 byte in the black and white part controls 8 pixels, 1 byte in the red and white part controls 8 pixels
  • Suppose there are 8 pixels, the front 4 are red, and the back 4 are black. Then you need to split them into 2 pictures: a black and white picture, a red and white picture. These two pictures are 8 pixels, but the first 4 pixels of the black and white picture are white, and the last 4 pixels are black, while the first 4 pixels of the red and white picture are red, and the last four pixels are white.

2.13inch-epPaer-B-pixels.png

  • If we stipulate that white is stored as 1, and red or black is stored as 0, then we have the following representation:

2.13inch-epPaer-B-pixels-2.png

  • And 1 byte of the black and white part controls 8 pixels, and 1 byte of the red and white part controls 8 pixels, then it can be expressed as follows:

2.13inch-epPaer-B-pixels-3.png

Precautions

  1. For e-Paper displays that support partial refresh, please note that you cannot refresh them with the partial refresh mode all the time. After refreshing partially several times, you need to fully refresh EPD once. Otherwise, the display effect will be abnormal.
  2. It is a normal phenomenon that the three-color or multi-color EPD will have a certain color difference in different batches. Hence, it is recommended to use the program to clear all the pictures on the EPD and store it facing up. Please clear the screen several times before powering on.
  3. Note that the screen cannot be powered on for a long time. When the screen is not refreshed, please set the screen to sleep mode or power off it. Otherwise, the screen will remain in a high voltage state for a long time, which will damage the e-Paper and cannot be repaired!
  4. When using the e-Paper display, it is recommended that the refresh interval be at least 180s, and refresh at least once every 24 hours. If the e-Paper is not used for a long time, you should use the program to clear the screen before storing it. (Refer to the datasheet for specific storage environment requirements.)
  5. After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.
  6. Control the 0x3C or 0x50 (refer to the datasheet for details) register to adjust the border color. In the demo, you can adjust the Border Waveform Control register or VCOM AND DATA INTERVAL SETTING to set the border.
  7. If you find that the created image data is displayed incorrectly on the screen, it is recommended to check whether the image size setting is correct, change the width and height settings of the image and try again.
  8. The working voltage of the e-Paper display is 3.3V. If you buy the raw panel, you need to add a level convert circuit for compatibility with 5V voltage. The new version of the driver board (V2.1 and subsequent versions) has added a level processing circuit, which can support both 3.3V and 5V. The old version only supports a 3.3V working environment. You can confirm the version before using it. (The version number is under the board name.)
  9. The FPC cable of the screen is fragile, Please note: Do not bend the cable along the vertical direction of the screen to avoid tearing the cable; Do not repeatedly excessive bending the cable, to avoid the cable fracture; Do not bend the cable toward the front of the screen to avoid the cable from being disconnected from the panel. It is recommended to use fixed wiring during debugging and development.
  10. The screen of e-Paper is relatively fragile, please try to avoid dropping, bumping and pressing hard.
  11. We recommend that customers use the sample program provided by us to test with the corresponding development board.

Working With Raspberry Pi

Hardware Connection

When connecting the Raspberry Pi, you can directly insert the board into the 40PIN pin header of the Raspberry Pi, and pay attention to the correct pins.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

Raspberry Pi Pinout
e-Paper Raspberry Pi
BCM2835 Board
VCC 3.3V 3.3V
GND GND GND
DIN MOSI 19
CLK SCLK 23
CS CE0 24
DC 25 22
RST 17 11
BUSY 24 18

Disable SPI Interface

  • Open the Raspberry Pi terminal and input the following commands to enter the configuration interface:
sudo raspi-config
Select Interfacing Options -> SPI -> No to enable the SPI interface

12.48 spi03.jpg
12.48 spi.jpg
12.48 spi02.jpg

  • Reboot the Raspberry Pi:
sudo reboot

C

  • Install lg library
#Open the Raspberry Pi terminal and run the following commands: 
wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip
cd lg-master
make
sudo make install
#For more details, you can refer to the source code: https://github.com/gpiozero/lg
  • Install gpiod library (Optional)
#Open the Raspberry Pi terminal and run the following commands: 
sudo apt-get update
sudo apt install gpiod libgpiod-dev
  • Install BCM2835
#Open the Raspberry Pi terminal and run the following command
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
# For more information, please refer to the official website: http://www.airspayce.com/mikem/bcm2835/
  • Install WiringPi (Optional)
#Open the Raspberry Pi terminal and run the following command:
sudo apt-get install wiringpi
#For Raspberry Pi systems after May 2019 (earlier than before, you may not need to execute), you may need to upgrade:
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
#Run gpio -v and version 2.52 will appear. If it does not appear, the installation is wrong.

#Bullseye branch system use the following command:
git clone https://github.com/WiringPi/WiringPi
cd WiringPi
./build
gpio -v
# Run gpio -v and version 2.60 will appear. If it does not appear, it means that there is an installation error.
  • Download the demo via GitHub (You can skip this step if you have downloaded it.)
git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/
  • Download the demo (You can skip this step if you have downloaded it.)
wget https://files.waveshare.com/upload/7/71/E-Paper_code.zip
unzip E-Paper_code.zip -d e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Compile the demo (Note: -j4 is to compile with 4 threads, the numbers can be modified by yourself; EPD=epd4in2bV2 is to specify a macro definition, and epd4in2bV2 corresponds to the test demo in the main function).
# Now at e-Paper/RaspberryPi_JetsonNano
cd c
sudo make clean
sudo make -j4 EPD=epd4in2bV2
  • Run the demo:
sudo ./epd

Python

  • Install the function library:
sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install spidev
  • Install function library (python2):
sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install spidev
  • Install gpiozero library (it is installed in the system by default, if not, you can install it by following the commands below)
sudo apt-get update
# python3
sudo apt install python3-gpiozero
# python2
sudo apt install python-gpiozero
  • Download the demo via GitHub (You can skip this step if you have downloaded it.)
git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/
  • Download the demo (You can skip this step if you have downloaded it.)
wget https://files.waveshare.com/upload/7/71/E-Paper_code.zip
unzip E-Paper_code.zip -d e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Run the demo:
# Make sure it's in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_4in2b_V2_test.py

Working With Arduino

Hardware Connection

Use an 8PIN cable to connect, please refer to the pin correspondence table below:

Arduino connection pin mapping
e-Paper Arduino UNO Mega2560
VCC 5V 5V
GND GND GND
DIN D11 D51
CLK D13 D52
CS D10 D10
DC D9 D9
RST D8 D8
BUSY D7 D7

Install IDE

Arduino IDE Windows Install Guide

Run The Demo

  • Download the demo in Resource, unzip it to the "E-Paper_code" directory, and you can see the following content:

Arduinos Guides for 4.37 e-Paper 001.jpg

  • Open the test demo: E-Paper_code\Arduino\epd4in2b_V2\epd4in2b_V2.ino

Arduinos Guides for 4.2invh b.jpg

  • Select the corresponding Board and Port in the Tools in the Arduino IDE.

Arduinos Guides for 4.37 e-Paper 003.jpg

  • Finally, click upload, the upload is successful as follows (Arduino 1.8.13).

Arduinos Guides for 4.37 e-Paper 004.jpg

Working With Jetson Nano

Hardware Connection

The 40PIN pin of Jetson Nano is compatible with the 40PIN pin of Raspberry Pi and it provides a Jetson.GPIO library with the same API as the RPI.GPIO library of Raspberry Pi, so the serial number connected here is the same as that of Raspberry Pi. The module can be directly inserted into the 40Pin headers of the Jetson Nano when using the 40PIN interface.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

Jetson nano connection pin mapping
e-Paper Jetson Nano Developer Kit
BCM2835 Board
VCC 3.3V 3.3V
GND GND GND
DIN 10 (SPI0_MOSI) 19
CLK 11 (SPI0_SCK) 23
CS 8 (SPI0_CS0) 24
DC 25 22
RST 17 11
BUSY 24 18

C

  • Download the demo via GitHub (you can skip this step if you have downloaded it.)
git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/
  • Download the test demo: (you can skip this step if you have downloaded it.)
wget https://files.waveshare.com/upload/7/71/E-Paper_code.zip
unzip E-Paper_code.zip -d e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Alternate method of decompression:
sudo apt-get install p7zip-full
7z x E-Paper_code.zip -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Compile the demo (Note: JETSON is specifying the device as jetson nano, and RPI is not specified by default. -j4 is to compile by 4 threads, and the number can be changed by yourself. "EPD=epd4in2bV2" is to specify a macro definition, and "epd4in2bV2" corresponds to the test demo in the main function.)
# Now at e-Paper/RaspberryPi_JetsonNano
cd c
sudo make clean
sudo make JETSON -j4 EPD=epd4in2bV2
  • Run the demo:
sudo ./epd

Python

  • Install function library:
sudo apt-get update
sudo apt-get install python3-numpy
sudo apt-get install python3-pip
sudo pip3 install Jetson.GPIO
  • Download the demo via GitHub (you can skip this step if you have downloaded it.)
git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/
  • Download the demo (you can skip this step if you have downloaded it.)
wget https://files.waveshare.com/upload/7/71/E-Paper_code.zip
unzip E-Paper_code.zip -d e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Run the demo:
# Make sure it's in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_4in2b_V2_test.py

Working With Sunrise X3 Pi

Hardware Connection

When connecting the Sunrise X3 Pi, you can directly insert the board into the 40PIN pin header of the Sunrise X3 Pi, and pay attention to the correct pins.
If you choose to connect with an 8PIN cable, please refer to the pin correspondence table below:

Sunrise X3 Pi connection pin mapping
e-Paper Sunrise X3 Pi
BCM Board
VCC 3.3V 3.3V
GND GND GND
DIN MOSI 19
CLK SCLK 23
CS CE0 24
DC 25 22
RST 17 11
BUSY 24 18

Enable SPI

  • SPI is enabled by default. If you have disabled it, you can enable it by following the steps below.
  • Enter the command: sudo srpi-config

Enable-SPI0.jpg
Enable-SPI.jpg
Enable-SPI2.jpg

Python

  • The corresponding library has been installed in the function. If you uninstall it accidentally, please use the following command to install it.
sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install Hobot.GPIO
sudo pip install spidev
  • Download the demo via GitHub (skip this step if you have downloaded it).
git clone https://github.com/waveshare/e-Paper.git
cd e-Paper/RaspberryPi_JetsonNano/
  • Download the demo (skip this step if you have downloaded it).
wget https://files.waveshare.com/upload/7/71/E-Paper_code.zip
unzip E-Paper_code.zip -d e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Alternate method of decompression:
sudo apt-get install p7zip-full
7z x E-Paper_code.zip -O./e-Paper
cd e-Paper/RaspberryPi_JetsonNano/
  • Run the demo:
# Make sure you are in e-Paper/RaspberryPi_JetsonNano/
cd python/examples/
python3 epd_4in2b_V2_test.py

Working With STM32

Hardware Connection

STM32 Connection pin mapping
e-Paper STM32
VCC 3.3V
GND GND
DIN PA7
CLK PA5
CS PA4
DC PA2
RST PA1
BUSY PA3

Run The Program

  • Click to download the demo, and then unzip it into the E-Paper_code directory to see the following content.

STM32 for 4.37 e-paper010.jpg

  • Use Keil to open epd-demo.uvprojx in the E-Paper_code\STM32\STM32-F103ZET6\MDK-ARM directory
  • Open Keil's compilation toolbar (usually already open).

STM32 for 4.37 e-paper012.jpg

  • Select the EPD_4in2b_V2_test at the location shown in the picture.

STM32 for 4.2 b e-paper0014.jpg

  • Click to compile.

STM32 for 4.37 e-paper014.jpg

  • Make sure the appropriate programmer is connected, then click LOAD to download the demo to the microcontroller.

ESP32/8266

ESP32

There is a lot of content, please click here to view.

ESP8266

There is a lot of content, please click here to view.

Resources

Documentation

Demo code

Development Resources

Third Parties Examples

This is the Inkycal project for reference.

FAQ

Questions about Software

 Answer:
  • Enter the command: ls /dev/spi*.
  • The result may appear as shown in the figure.

2.36inch e-paper Hat FAQ02.jpg

  • This is because the SPI interface is occupied in the /boot/config.txt file.

2.36inch e-paper Hat FAQ03.jpg

  • Steps:
    • Delete the occupation of spi0-0 in the /boot/config.txt file.
    • Modify the location shown in the picture in the /e-Paper/RaspberryPi_JetsonNano/lib/waveshare_epd/epdconfig.py file and change it to 0,1.
    • 2.36inch e-paper Hat FAQ04.jpg

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 Answer:
  • Our demo uses STM32f103ZET6. If the customer modifies other models in MDK, such as STM32F103RBT6, the RAM space becomes smaller, and the stack size and heap size in the startup file need to be modified on the original basis.
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 Answer:
  • When transmitting B/W data, use Data Start Transmission 1; When transmitting RED data, use Data Start Transmission 2.
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 Answer:
  • The border display color can be set through the Border Waveform Control register or the VCOM AND DATA INTERVAL SETTING register.
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 Answer:
  • In this case, the customer needs to reduce the position of the partial refresh and clear the screen after 5 rounds of partial refreshing (increasing the voltage of VCOM can improve the color, but it will increase the afterimage).
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 Answer:
  • The process of re-awakening the e-Paper screen is actually the process of re-powering. Therefore, when the EPD wakes up, the screen must be cleared first, so as to avoid the afterimage phenomenon to the greatest extent.

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 Answer:
  • It may be caused by the unsuccessful SPI driver.
    • 1. First check whether the wiring is correct.
    • 2. Check whether the SPI is enabled and whether the parameters are configured correctly (SPI baud rate, SPI mode and other parameters).
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 Answer:
  • The full refresh initialization function needs to be added when the e-Paper screen is switched from partial refresh to full refresh.

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 Answer:
  • It may be a demo based on the BCM2835 library that has run the C language before. At this time, you need to restart the Raspberry Pi and then run the Python demo.

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 Answer:
  • Install the imaging library using the command "sudo apt-get install python-imaging".
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Questions about Hardware

 Answer:
  • Yes, now there is a level conversion chip onboard, supporting a 5V drive.
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 Answer:
  • The rated input voltage of the e-Paper screen is 2.3~3.6V. If it is a 5V system, level conversion is required. In addition, the voltage should not be lower than 2.5V, so as not to affect the display effect of the e-Paper screen.
  • Device selection can use the model in the schematic diagram we provide or choose according to the datasheet.
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 Answer:
  • Yes, pay attention to the correct timing.
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 Answer:
  • Check if SPI communication is normal.
  • Confirm whether the BUSY pin is normally initialized to input mode.
  • It may be that there is no normal reset, try to shorten the duration of the low level during reset (because the power-off switch is added to the drive circuit, the reset low level is too long, which will cause the drive board to power off and cause the reset to fail).
  • If the busy function sends the 0x71 command, you can try to comment it out.
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 Answer:
  • 1.64inch, 2.36inch, 3inch, 0.5mm pitch, 26Pin.
  • 1.02inch, 0.5mm pitch, 30Pin.
  • 4.37inch, 7.3inch, 0.5mm pitch, 50Pin.
  • The rest (non-parallel ports) are 0.5mm pitch, 24Pin.

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 Answer:
  • Cable socket 0.5-XXpin rear-flip 2.0H (FPC connector).

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Questions about Screen

 Answer:
  • 【Working conditions】Temperature range: 0~40°C (seven-color screen: 15~35°C); Humidity range: 35%~65%RH.
  • 【Storage conditions】Temperature range: below 30°C; Humidity range: below 55%RH; Maximum storage time: 6 months.
  • 【Transportation conditions】Temperature range: -25~50°C; Maximum transportation time: 10 days.
  • 【After unpacking】Temperature range: 20°C±5°C; Humidity range: 50±5%RH; Maximum storage time: Assemble within 72 hours.
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 Answer:
  • Refresh mode
    • Full refresh: The e-Paper screen will flicker several times during the refresh process (the number of flickers depends on the refresh time), and the flicker is to remove the afterimage to achieve the best display effect.
    • Partial refresh: The e-Paper screen has no flickering effect during the refresh process. Users who use the partial refreshing function note that after refreshing several times, a full refresh operation should be performed to remove the residual image, otherwise the residual image problem will become more and more serious, or even damage the screen (currently only some black and white e-Paper screens support partial refreshing, please refer to product page description).
  • Refresh rate
    • During use, it is recommended that customers set the refresh interval of the e-Paper screen to at least 180 seconds (except for products that support the partial refresh function).
    • During the standby process (that is, after the refresh operation), it is recommended that the customer set the e-Paper screen to sleep mode, or power off (the power supply part of the e-Paper screen can be disconnected with an analog switch) to reduce power consumption and prolong the life of the e-Paper screen. (If some e-Paper screens are powered on for a long time, the screen will be damaged beyond repair.)
    • During the use of the three-color e-Paper screen, it is recommended that customers update the display screen at least once every 24 hours (if the screen remains the same screen for a long time, there will be a screen burn that is difficult to repair).
  • Usage Environment
    • The e-Paper displays are recommended for indoor use and not for outdoor use.
    • If the usage scenario is outdoors, we do not guarantee the display effect. If the e-Paper screen is damaged due to outdoor use, we do not provide warranty service.
    • Here are some protective measures for outdoor use, but we do not guarantee that the e-Paper screen will function normally even after taking these precautions:
      • Avoid exposing the e-Paper screen to direct sunlight and ensure UV protection. Prolonged exposure to strong light can dry out the charged particles, rendering them inactive and unable to refresh, which is irreversible.
      • Completely cover the white glue part of the e-Paper screen's connection ribbon with 3M tape. Complete coverage and no coverage show different effects under UV light.
      • Place the e-Paper screen in relatively shaded areas, such as under trees or the shadow of eaves.
    • When designing e-Paper screen products, customers should ensure that the usage environment meets the requirements of the e-Paper screen.
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 Answer:
  • Ideally, with normal use, it can be refreshed 1,000,000 times (1 million times).
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 Answer:
  • Power on the development board for a long time, after each refresh operation, it is recommended to set the screen to sleep mode or directly power off, otherwise, the screen may burn out when the screen is in a high voltage state for a long time.
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 Answer:
  • Yes, but you need to re-initialize the electronic paper with software.
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 Answer:
  • Maybe the SPI rate is too high, resulting in data loss, try to reduce the SPI rate.
  • Insufficient or unstable power supply leads to data loss.
  • The data cable is so long to cause data loss, the extension cable should not exceed 20cm.
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 Answer:
  • The display gray scale of electrophoretic electronic paper is determined by the spatial position of the particles in the Microcapsule or Microcup. The electrophoresis phenomenon occurs between black particles and white particles under the action of voltage. This voltage sequence that promotes the electrophoretic movement of the particles is the driving waveform of the electronic paper. The driving waveform is the core part of the electronic paper display, and the optimization of the driving waveform will directly affect the display effect of the display. The driving waveform file is used to describe the parameters formed by the voltage sequence that promotes the electrophoretic movement of the particles, and it needs to be called regularly when the electronic paper is refreshed.
  • For different batches of e-Paper diaphragms, electrophoretic matrices require different voltage values ​​when driving the display due to materials, manufacturing processes, etc. The waveform of the e-Paper screen is reflected in the relationship between grayscale, voltage and temperature. Generally speaking, after each batch of electrophoresis matrix is ​​generated, there will be a corresponding waveform file in the form of a .wbf file. The film manufacturer will provide the waveform file and electrophoresis matrix to the manufacturer of the e-Paper screen, and then the manufacturer of the e-Paper screen integrates the protection board, substrate and driver and then provides it to customers; if the waveform file does not correspond to the screen, it is likely that the display cannot be displayed or the display effect is unsatisfactory. Generally, the waveform file has OTP built into the driver IC of the e-Paper screen when leaving the factory, and some programs we provide also called external waveform files to drive the e-Paper screen.
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 Answer:
  • LUT is the abbreviation of LOOK UP TABLE, and OTP is the abbreviation of ONE TIME PROGRAM. The original intention of LUT is to load waveform files, and the waveform files are divided into OTP and REGISTER. Among them, OTP is the built-in waveform storage method, and REGISTER is the external waveform storage method.
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 Answer:
  • There are mainly two types of e-Paper screens.
    • One is to refresh the background image first.
    • The other is to alternately refresh old data and new data.
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 Answer:
  • Simultaneous partial refreshing in different locations needs to be operated in the program design, that is, first refreshing the data of different locations into the electronic paper IC, and finally doing the Update/TurnOnDisplay uniformly.
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 Answer:
  • Yes, when the e-Paper is batched, there will be some color difference, which is a normal phenomenon. Store the e-Paper faces up to reduce the reddish/yellowishness to a certain extent.
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 Answer:
  • With film.
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 Answer:
  • At present, all screens have built-in temperature sensors, and you can also use IIC pins external LM75 temperature sensor.
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