7.9inch DSI LCD

400 x 1280, RPI, DSI

Overview

Feature

7.9-inch DSI touch display with 5-point capacitive touch control.
IPS panel, with a hardware resolution of 400×1280.
Toughened glass panel, up to 6H hardness.
Supports Pi5/4B/CM4/3B+/3A+/3B/CM3+/CM3.
Directly drive LCD via Raspberry Pi's DSI interface, refresh rate up to 60Hz.
When working with Raspberry Pi, supports Bookworm/Bullseye/Buster.
Adjustable brightness via 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 4-pin header.
The installation effect 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 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 4-pin header.
The installation effect is shown below:

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 Driver Manually

Download the image of the newest version Raspberry Pi, download the compressed file to the PC and extract the .img file.
Connect the TF card to PC, use SDFormatter to format the TF card.
Open Win32DiskImager software, select the system image prepared in step 1 and click write to burn the system image.
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 under [all], 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 and executing the following command:

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

After updating the system, some diver files installed before may be covered, 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 require loading different driver files, to ensure proper display functionality on the new mainboard, the user need to reinstall the drivers according to the instructions #For Buster System.

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 in the terminal:

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

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

Bookworm Touchscreen Rotation

1. Open "Screen Configuration" application.

2. Enter "Screen" -> "DSI-1" -> "Touchscreen", and select "10-0014 Goodix Capacitive TouchScreen".

3. Click "Apply", and then close the current window. Reboot according to the pop-up prompts to complete the specified touchscreen.

4. Enter "Screen" -> "DSI-1"->"Orientation", and select the rotation direction. Then click on "Apply" to complete the display and touch synchronous rotation.

Note: Only the Bookworm system supports the above synchronous rotation method, for Bullseye and Butser systems, after the display rotates, you need to set the touch rotation additionally.

Bullseye/Buster Display Rotation

1. Open "Screen Configuration" application.

2. Enter "Screen"->"DSI-1"->"Orientation", select the rotation direction, and then click on "Apply" to complete the display rotation.

Bullseye/Buster Touch Rotation

sudo nano /boot/config.txt
#Change the command for the touch rotation angle at the end of the config.txt file, reboot it to take effect (the command for 0° touch direction exists by default) 
#90°:
dtoverlay=WS_xinchDSI_Touch,invertedy,swappedxy
#180°:
#dtoverlay=WS_xinchDSI_Touch
#270°:
#dtoverlay=WS_xinchDSI_Touch,invertedx,swappedxy
#0°:
#dtoverlay=WS_xinchDSI_Touch,invertedx,invertedy

lite Version Rotation

sudo nano /boot/cmdline.txt
#Add the command to display the rotation angle at the beginning of the cmdline.txt file, save and reboot to take effect
#Display rotates 90°
video=DSI-1:400x1280e,rotate=90
#Display rotates 180°
video=DSI-1:400x1280e,rotate=180
#Display rotates 270°
video=DSI-1:400x1280e,rotate=270

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 on the Raspberry Pi terminal to enter the sleep mode:

xset dpms force off

Resource

Software

Pre-installed images

3D Drawing

7.9inch DSI LCD 3D Drawing

FAQ

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

Answer:

Replace the image in this directory /usr/share/plymouth/themes/pix/splash.png with the custom image.

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7.9inch DSI LCD

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