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UCTRONICS 3.5 Inches HDMI TFT LCD Touch Screen Display



UCTRONICS 3.5" HDMI TFT LCD display module is designed for Raspberry Pi 2 /Pi 3 Model B / B+ and can also be used on other hardware platforms which have HDMI display interface. The 3.5" screen is the same size as the standard Raspberry Pi model B/B+, and well mates with these Raspberry Pi boards. With its touch screen and split audio from the HDMI input, it is ideal for portable devices and multimedia projects, and it is a replacement for a heavy and bulky HDMI monitor, keyboard and mice. The highlight of this display module, it supports high frame rate videos playback compared to its SPI LCD counterpart. LCD screen backlight can be turned off by the tiny onboard button if needed.


LCD Resolution: 480 x 320 pixels Support plug and play
Interface: HDMI Support touch screen
HDMI Input Resolution support:480x320 ~ 1920x1280 Support game and video
Support audio split from HDMI Automatic driver installation script
Dimension: 55.98 x 85.60 mm Well mate with Pi Zero, Pi B+, Pi2 and Pi3

Hardware installation

        SPI hardware.png             LCD35 HDMI.jpg
                Figure1                                       Figure2

The Figure 1 shows the display module pin out and dimension. Connect the 3.5 inch HDMI LCD to the Raspberry Pi board like the Figure 2 shows,

Step1: Align the pin 1 of the edge connector between the LCD display and Raspberry pi board,
Step2: Connect the HDMI interface with the HDMI adapter board.
Step3: Power on the Raspberry Pi board and make sure the internet is connected properly

Download and install driver

The driver includes the settings of the Raspbain OS resolution and touch screen support. The LCD driver has been already installed in the Micro SD card shipped with the bundle kit that includes a Micro SD card. Otherwise users have to install the driver manually with the following steps for a clean system.

Step1: Expand the Micro SD card

sudo raspi-config

then Select Advanced Operations -> Expand Filesystem and hit YES , then go to Finish and you need to run sudo reboot to reboot your Raspberry Pi.

Step2: Update your Raspberry Pi system

sudo apt-get update

Step3: Download the driver package

sudo git clone https://github.com/UCTRONICS/UCTRONICS_LCD35_HDMI_RPI.git



Step5: Change the file permission

sudo chmod 777 UCTRONICS_hdmi_backup

sudo chmod 777 UCTRONICS_hdmi_install

sudo chmod 777 UCTRONICS_hdmi_restore

Step6: Backup original system data

sudo ./UCTRONICS_hdmi_backup

Step7: Install the LCD35 HDMI driver

sudo ./UCTRONICS_hdmi_install

Wait for 2~3 minutes, the system will be installed and restarted automatically. If you want to reuse the pre-installation system, you can use the below command

sudo ./UCTRONICS_hdmi_restore

If you want to display on HDMI instead of LCD, just use the below command

sudo ./UCTRONICS_LCD_hdmi

If you don’t want to run those commands to install the LCD driver, we also provide ready to use system image file “UCTRONICS_LCD35_HDMI.img". Please click the following link to download the system image file:


Check the following link to install the win32diskimager tool in your computer. Then write the image file into the Micro SD card.


Add more functions to the LCD

Install calibration software for calibration


sudo unzip Xinput-calibrator_0.7.5-1_armhf.zip

cd xinput-calibrator_0.7.5-1_armhf/

sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

Install virtual keyboard

Step1: Execute the following commands to install the corresponding software

sudo apt-get update

sudo apt-get install matchbox-keyboard

sudo nano /usr/bin/toggle-matchbox-keyboard.sh

Step2: Copy the following contents to toggle box - keyboard. Sh, save the exit
#This script toggle the virtual keyboard
PID=pidof matchbox-keyboard
if [ ! -e $PID ]; then
killall matchbox-keyboard
matchbox-keyboard -s 50 extended&
Step3: Execute the following command

sudo chmod +x /usr/bin/toggle-matchbox-keyboard.sh

sudo mkdir /usr/local/share/applications

sudo nano /usr/local/share/applications/toggle-matchbox-keyboard.desktop

Step4: Copy the following contents to toggle - matchbox - keyboard. Desktop, save exit
[Desktop Entry]
Name=Toggle Matchbox Keyboard
Comment=Toggle Matchbox Keyboard`
Step5: To perform the following command, note that this step must use the "PI" user permission, and if the administrator privileges are used, the file will not be found

nano ~/.config/lxpanel/LXDE-pi/panels/panel

Step6: Find similar commands (different versions of ICONS may differ)
Plugin {
type = launchbar
Config {
Button {
Button {
Step7: Add the following code to add a Button item
Button {
Step8: To restart the system with the following command, you can see a virtual keyboard icon in the top left corner

sudo reboot

Trouble Shooting

How to dd new ICON to desktop

If it's just a folder, add it directly to the desktop. If it is an executable, follow these steps:

Step1:  choose the Directory Tree -> / -> usr -> share ->applications folder
Step2:  choose a icon you want to link
Step3:  choose edit -> create link... ->Desktop ->OK

Some zones working much better than others, the near edge zones seem the worst.

  • You should recalibrate the touchscreen.
  • Download our UCTRONICS_LCD35_HDMI_RPI package from
  • Install calibration software for calibration


sudo unzip Xinput-calibrator_0.7.5-1_armhf.zip

cd xinput-calibrator_0.7.5-1_armhf/

sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

 Calibration1.jpeg             Calibration2.jpeg

The screen sometimes has stripes

*Excessive hot plug will cause the hdmi initialization to be abnormal and it require restart

Flash screen occurs when starting up

  • Don't worry, this is the normal initialization phenomenon.

What about the frame speed?

  • Our HDMI frame speed can up to 60 fps.

The HDMI always display no signal

  • You should try reconnect the HDMI connector.

How to write UCTRONICS HDMI LCD3 5 Screen image to the SD card Windows?

  • Image can be downloaded from
  • Refer to this video link:

Contact us

If need any further support, please feel free to contact us.

Website: http://www.uctronics.com
Email: support@uctronics.com
Tel: +86 025 84271192