Introduction

The 4-DSI-TOUCH-C is a portrait touchscreen LCD display designed for interactive projects such as tablets, entertainment systems, and information dashboards.

Features

4inch DSI touch screen, ten-point capacitive touch control
IPS display panel with a hardware resolution of 720×720
Adopt the optical bonding process for clearer picture quality
Toughened glass touch panel, hardness up to 6H
Drive the LCD through the DSI interface, with a refresh rate of up to 60Hz
Supports software control of backlight brightness
Aluminum alloy back cover design, pure passive cooling design

Video Tutorial

Electrical Specifications

Parameters	Minimum Value	Standard Value	Maximum Value	Unit	Note
Input voltage	4.75	5.00	5.30	V	Note 1
Input current	-	0.3	TBD	A	Note 2
Operating temperature	0	25	60	℃	Note 3
Storage temperature	-10	25	70	℃	Note 3

•Note 1: Input voltages exceeding the maximum or improper operation may cause permanent damage to the device.
•Note 2: The input current needs to be ≥ 0.3A, otherwise it will cause the startup failure or display abnormality, and staying in an abnormal state for a long time may cause permanent damage to the device.
•Note 3: Please do not store the display panel in a high-temperature and high-humidity environment for a long time. The display panel should operate within its limits, otherwise it may be damaged.

Interfaces

Working with Raspberry Pi

Pi5/CM5/CM4/CM3+/CM3 Hardware Connection

1. Use the "FFC Cable 22PIN 200mm (opposite direction)" to connect the DSI port of the display to the 22PIN DSI port of the Raspberry Pi motherboard.
2. Use the "GPIO cable" to connect the power connector of the display to the 5V GND pin header of the Raspberry Pi motherboard.

3. Secure the Raspberry Pi to the display with M2.5 screws.

The installation effect is as follows:

Note: Make sure that the DSI cable is connected in the correct direction and 5V power is supplied through the GPIO pins.

Pi4B/3B+/3B/3A+ Hardware Connection

1. Use the "DSI-Cable-12cm" cable to connect the DSI port of the display to the 15PIN DSI port of the Raspberry Pi motherboard.
2. Use the "GPIO cable" to connect the power connector of the display to the 5V GND pin header of the Raspberry Pi motherboard.

3. Secure the Raspberry Pi to the display with M2.5 screws.

The installation effect is as follows:

Note: Make sure that the DSI cable is connected in the correct direction and 5V power is supplied through the GPIO pins.

Software Settings

Flash Latest Trixie/Bookworm System

1. Connect the TF card to the PC, download and use Raspberry Pi Imager to flash the corresponding system image.

2. After the image flashing is completed, open the config.txt file in the root directory of the TF card, add the following code at the end of the config.txt, save and safely eject the TF card.

Note: Since Pi5/CM5/CM4/CM3+/CM3 has two mipi DSI interfaces, please note that the correct DSI interfaces and commands are used, DSI1 is recommended by default.

dtoverlay=vc4-kms-v3d
#DSI1 Use
dtoverlay=vc4-kms-dsi-waveshare-panel-v2,4_0_inch_c
#DSI0 Use
# dtoverlay=vc4-kms-dsi-waveshare-panel-v2,4_0_inch_c,dsi0

3. Insert the TF card into the Raspberry Pi, power on the Raspberry Pi, and generally wait for about 30 seconds to enter the display state. The touch function can be used normally after the system boots.

Adjust Backlight Brightness

Graphical Interface Backlight Adjustment

The following steps are based on the Trixie system:

1. Click the menu in the upper left corner, then go to Preferences → Control Center, and select Screens;

2. Go to "Screen" -> "DSI-2" -> "Brightness", check and adjust the desired backlight brightness, and finally click Apply to save the settings.

In the Bookworm system, this setting entry is located at Screen Configuration → Screen.

Use Waveshare Backlight Adjustment Application

You can also use the graphical backlight adjustment tool provided by Waveshare:

wget https://files.waveshare.com/wiki/common/Brightness.zip
unzip Brightness.zip
cd Brightness
sudo chmod +x install.sh
./install.sh

After the installation is completed, you can open the demo in the Start Menu -> Accessories -> Brightness, as shown below:

Adjust Backlight Brightness Using Terminal

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

Where X represents any number from 0 to 255. 0 means the darkest backlight, and 255 means the brightest backlight. 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

Trixie/Bookworm Display Rotation

GUI Interface Rotation

The following steps are based on the Trixie system:

1. Click the menu in the upper left corner, then go to Preferences → Control Center, and select Screens;

2. Go to Screens -> DSI-1 -> Touchscreen and check "10-0014 Goodix Capacitive TouchScreen";

3. Go to Screens -> DSI-2 -> Orientation, check the direction you need to rotate, and finally click "Apply" to complete the display and touch synchronous rotation.

In the Bookworm system, this setting entry is located at Screen Configuration → Screen.

Note: Only Trixie/Bookworm systems support the above synchronous rotation methods.

lite Version Display Rotation

sudo nano /boot/firmware/cmdline.txt
#Add the display resolution and rotation commands at the beginning of the cmdline.txt file to take effect after a reboot
#For example, the DSI-1 display has a 720x1280 resolution and the display rotation is 90 degrees
video=DSI-1:720x1280e,rotate=90
#For example, the DSI-1 display has a 720x1280 resolution and the display rotation is 180 degrees
video=DSI-1:720x1280e,rotate=180
#For example, the DSI-1 display has a 720x1280 resolution and the display rotation is 270 degrees
video=DSI-1:720x1280e,rotate=270

Notes:

1. Based on actual display resolution.
2. If using Pi5/CM5, use the actual DSI display number identified, for example, "DSI-2".
3. It is not possible to rotate DSI monitor and HDMI monitor separately using cmdline.txt. When you use both DSI and HDMI simultaneously, they share the same rotation value.

Touch Rotation

If you use the graphical interface for rotation, you can tick "Touchscreen" in the screen layout editor window to synchronize the touch rotation. Please refer to the previous introduction for how to rotate the screen. For the command line rotation method, please refer to the following text:
1. Create a new file named 99-waveshare-touch.rules

sudo nano /etc/udev/rules.d/99-waveshare-touch.rules

2. Add the following lines as needed:

#90°:
ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"

#180°:
#ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1"

#270°:
#ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1"

3. Save and reboot

sudo reboot

Touch Mode Selection

The Trixie and Bookworm systems support two touch modes, which can be switched in the Screen Configuration > Touchscreen menu:

1. Mouse Emulation (default)

Click = Left mouse button function
Long press = Right mouse button function
Supports double-click
Does not support page swiping and multi-touch functionality

Note: This mode is suitable for scenarios that require mouse operation, such as double clicking to open the file manager and long pressing to achieve right-click functionality.

2. Multitouch

Supports multi-touch functionality
Supports swiping pages
Does not support double-click and long-press right-click functions

Note: This mode is suitable for touch-optimized scenarios, such as web browsing and scrolling lists.

Use Touchscreen Virtual Keyboard

Raspberry Pi OS Bookworm and later versions include Squeekboard on-screen keyboard by default.

The keyboard system will automatically pop up when text input is available and automatically hide when text input is not available.
It can also be shown or hidden manually via the keyboard icon in the top right corner of the taskbar

You can also permanently set the display or hiding of the on-screen keyboard through the menu Preferences → Control Centre → Display in the upper left corner.

In the Bookworm system, you can set the keyboard to be displayed or hidden via Raspberry Pi Configuration → Display or raspi-config → Display.

Note:

For older versions of Raspberry Pi OS before Bookworm, please use matchbox-keyboard. If you are using the wayfire desktop compositor, use wvkbd.

Working with ESP32-P4

Screen Driver

The ESP32-P4-NANO drives the screen via MIPI 2-lane

The screen driver has been packaged as a component, with the component located at ESP Component Registry
Use idf.py add-dependency "waveshare/esp_lcd_jd9365" to add components to your ESP-IDF project
You can also directly view the Wiki that describes how ESP32-P4-NANO drives the screen: ESP32-P4-NANO_MIPI-DSI

Backlight Control

After connecting the ESP32-P4-NANO with the matching FPC cable and power cable, the backlight can be controlled by writing 0x00~0xFF (full brightness) to the 0x45 device and 0x96 register on the screen through the ESP32-P4-NANO I2C

If you use the ESP32-P4-PLATFORM BSP component, you can control it directly by the following functions

bsp_display_brightness_init();   // Initialize the backlight

bsp_display_backlight_on();      // Turn on the backlight, default full brightness

Bsp_display_backlight_off();     // Turn off the backlight

bsp_display_brightness_set(95);  // Set the specific backlight brightness, 0~100

Safety Instructions

To avoid any malfunction or damage to this product, please follow the following instructions:

Turn off your Raspberry Pi computer and disconnect the external power supply before connecting the device.
If the cable falls off, pull the locking device on the connector forward, insert the ribbon cable with the metal contacts facing you, and push the locking device back into place.
This device should be operated in a dry environment between 0-60°C.
Do not expose the device to water or humid environments during operation, nor place it on conductive surfaces.
Do not expose it to any overheated environment.
Be careful not to fold or tighten the ribbon cable.
Be careful when screwing in the parts. Misalignment of threads may cause irreparable damage and void the warranty.
Please be careful during transportation to avoid mechanical or electrical damage to printed circuit boards and connectors.
Store in a cool and dry place.
Avoid sudden temperature changes, otherwise it may lead to the accumulation of moisture inside the device.
The screen is fragile and may break.

Resources

Diagrams

FAQ

Question: What are the display IC and touch IC used in the 4-DSI-TOUCH-C?

Answer:

The display IC is JD9365 and the touch IC is GT928.

Question: How to completely turn on or off the screen on a Raspberry Pi Trixie / Bookworm?