7.9inch DSI LCD

7.9inch DSI LCD 400 x 1280, RPI, DSI

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Primary Attribute Category: OLEDs / LCDs, LCD, Raspberry Pi LCD {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

Website International: [ Website] Chinese: 官网

Onboard Interfaces DSI

Related Products

Overview

Feature

• 7.9-inch DSI touch display with 5-point capacitive touch control.
• IPS panel, with a hardware resolution of 400×1480.
• Toughened glass panel, up to 6H hardness.
• Supports Pi5/4B/CM4/3B+/3A+/3B/CM3+/CM3.
• DSI interface, refresh rate up to 60Hz.
• When working with Raspberry Pi, supports Bookworm/Bullseye/Buster.
• Brightness is adjustable by software.

Hardware Connection

Working with Pi4B/3B+/3B/3A+

1. Use a 15PIN FPC cable to connect the DSI interface of the display screen to the DSI interface of the Raspberry Pi board.
2. Install the Raspberry Pi on the display board with the back facing down, and connect the 5V power supply and I2C communication through the 4PIN.
The final connection is shown below:

Working with Pi5/CM4/CM3+/CM3

1. Use the "DSI-Cable-12cm" cable to connect the display's DSI interface to the 22-pin DSI1 interface on the Raspberry Pi board.
2. Use the "PH2.0 4PIN connection cable" to connect the display screen's 4-pin header to the 5V and GND pins on the Raspberry Pi board. (By default, it uses the I2C0 of the DSI interface. If using the I2C1 mode, you will need to additionally connect the SDA and SCL pins.)

Software Setting

For Bookworm and Bullseye System

• 1. Insert the TF card into the PC, download and use Raspberry Pi Imager to program the corresponding image.

• 2. After programming the image, open the "config.txt" file located in the root directory of the TF card. Add the following code at the end of config.txt, save the file, and safely eject the TF card.

Note: As Pi 5/CM4/CM3+/CM3 has two MIPI DSI interfaces, please ensure to use the correct DSI interface and command. DSI1 is recommended by default.

dtoverlay=vc4-kms-v3d
#DSI1 Use
dtoverlay=vc4-kms-dsi-waveshare-panel,7_9_inch
#DSI0 Use
#dtoverlay=vc4-kms-dsi-waveshare-panel,7_9_inch,dsi0

• 3. Insert the TF card into the Raspberry Pi, power on the Raspberry Pi, and wait for a few seconds. After the system boots up, you should be able to enter the display interface and the LCD should touch normally.

For Buster System

Method 1: Install Manually

1. Download the image of the newest version Raspberry Pi, download the compressed file to the PC and extract the .img file.
   
2. Connect TF card to PC, use SDFormatter to format TF card.
   
3. Open Win32DiskImager software, select the system image prepared in step 1 and click write to burn the system image.
   
4. After the programming is completed, connect the TF card to the Raspberry Pi, start the Raspberry Pi, and log in to the terminal of the Raspberry Pi (you can connect the Raspberry Pi to an HDMI display or log in remotely with ssh).
   

#Step 1: Download and enter the Waveshare-DSI-LCD driver folder
git clone https://github.com/waveshare/Waveshare-DSI-LCD
cd Waveshare-DSI-LCD
 
#Step 2: Enter uname --all in the terminal to view the kernel version and cd to the corresponding file directory
#6.1.21 then run the following command
cd 6.1.21
 
#Step 3: Please check the bits of your system, enter the 32 directory for 32-bit systems, and enter the 64 directory for 64-bit systems
cd 32
#cd 64
 
#Step 4: Enter your corresponding model command to install the driver, pay attention to the selection of the I2C DIP switch
#7.9inch DSI LCD 400×1280 driver：
sudo bash ./WS_xinchDSI_MAIN.sh 79 I2C0
 
#Step 5: Wait for a few seconds, when the driver installation is complete and no error is prompted, restart and load the DSI driver and it can be used normally
sudo reboot

Note: The above steps need to ensure that the Raspberry Pi can be connected to the Internet normally.
5. Wait for the system to restart, it will be able to display and touch normally.

Method 2: Program Pre-install Image

1. Click to download Waveshare DSI LCD - Pi4 pre-install image and unzip it to get ".img" file.
2. Connect the TF card to the PC and use SDFormatter to format the TF card.
3. Open Win32DiskImager software, choose the system image prepared in the first step, and then click "write" to write the system image,
4. After programming, open the "config.txt" file in the root directory of the TF card, add the following code at the end of config.txt, save and then safely remove the TF card.

dtoverlay=WS_xinchDSI_Screen,SCREEN_type=5,I2C_bus=10
dtoverlay=WS_xinchDSI_Touch,invertedx,invertedy,I2C_bus=10

5. Connect the TF card to the Raspberry Pi, and start the Raspberry Pi, wait for about 30 seconds to display and touch normally.

Precaution

1. Update the system, such as executing the following command:

sudo apt-get update
sudo apt-get full-upgrade

After updating the system, some files of the originally installed driver may be overwritten, and the driver needs to be reinstalled to display normally.
2. Replace the motherboard
If the driver is originally installed on the Raspberry Pi 4 Model B, the user replaces the motherboard, such as modifying it to a Raspberry Pi 3 Model B+, the display will not display properly.
Because Pi4 and Pi3 need to load different driver files, you need to reinstall the driver on the new motherboard to display properly.

Backlight Control

WaveShare provides the corresponding demo for the application (only supports Bookworm and Bullseye systems). Users can install it by the following commands:

wget https://files.waveshare.com/upload/f/f4/Brightness.zip
unzip Brightness.zip
cd Brightness
sudo chmod +x install.sh
./install.sh

After installation, you can open it: Menu -》Accessories -》Brightness:

In addition, you can also input the following commands to control the backlight brightness:

echo X | sudo tee /sys/class/backlight/*/brightness

Where X indicates any number from 0 to 255. 0 means the backlight is the darkest, and 255 means the backlight is the brightest. For example:

echo 100 | sudo tee /sys/class/backlight/*/brightness
echo 0 | sudo tee /sys/class/backlight/*/brightness
echo 255 | sudo tee /sys/class/backlight/*/brightness

Disable Touch

At the end of the config.txt file, add the following commands corresponding to disabling touch (the config file is located in the root directory of the TF card, and can also be accessed through the command: sudo nano /boot/config.txt):

disable_touchscreen=1

Note: After adding the command, it needs to be restarted to take effect.

Sleep Mode

Run the following commands to enter the sleep mode:

xset dpms force off

Resource

Software

• Panasonic_SDFormatter
• Win32DiskImager
• putty

Pre-installed images

• 7.9inch DSI LCD_220906_32_bullseye
• Waveshare DSI LCD - Pi4 pre-install image
• Waveshare DSI LCD - Pi3 pre-install image

3D Drawing

• 7.9inch DSI LCD 3D Drawing

FAQ

Question:How to replace the Raspberry Pi boot logo image?

 Answer:

Just replace the customized image with one from this directory /usr/share/plymouth/themes/pix/splash.png.

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