Product: Osoyoo 3.5″ HDMI Touchscreen Display

Resolution: 480×320 (Physical) / Up to 1920×1080 (Input)

Compatible: Raspberry Pi 3B/3B+/4/5, Pi Zero, PC/Laptop, etc

Touch Support: Raspberry Pi OS only

Buy 3.5″ HDMI Screen:

Buy 3.5″ HDMI Screen with Case:

Table of Contents

• 1. Overview
• 2. Features
• 3. Specification
• 4. Interface
• 5. Getting Started
• 6. How to Use as PC Monitor
• 7. Related Docs
• 8. Tech Support

1Overview

OSOYOO 3.5 inch HDMI screen is a touchscreen display designed for Raspberry Pi. It can also be used as a general purpose HDMI monitor for PC/laptop (display only, no touch).

2Features

• Power Supply: GPIO 5V pin or USB Type-C (5V/1A for display, 5V/3A if also powering Pi)
• Power Switch: Toggle on/off (suspend mode), LED indicates status
• Brightness Button: Adjusts 10~100% in 10% steps, value saved
• Display Rotation: Hold brightness + press power = rotate 180°
• DDC/CI Support: Adjust brightness, contrast, colors via HDMI commands
• Auto Scaling: RTD2660 chip scales any resolution (up to 1920×1080) to 480×320

3Specification

• Physical LCD resolution: 3.5 inch 480×320 (ILI9488)
• Configurable software resolution: max 1920×1080, 60~75fps
• Default video resolution: 720×480 (3:2 ratio)
• Auto fill screen area
• TN LCD, View angle 12 O’Clock
• XPT2046 Resistive touch with pen
• LED power status indicator (Off: active, On: suspend)
• USB Type-C port for power supply only
• Mechanical size: Board 85mm × 56mm, LCD view area 73.4mm × 49mm
• Full Compatible with Raspberry Pi 3B, 3B+, 4, 5
• Touch driver compatible with: Raspberry Pi OS
• Display function works with all HDMI devices
• Only touch function requires GPIO; display doesn’t use GPIO

4Interface

• HDMI interface: HDMI signal input
• Backlight adjust switch: Short press = 10% change, long press 3s = close backlight
• On/Off switch: Turn on/off the backlight
• Type C power port: Provide power (5V 1A)
• GPIO Port: Gets power and returns touch data. Pins marked “NC” are not occupied by LCD.

GPIO Pin Assignment

5Getting Started

5.1 Hardware Connection

1. Connect GPIO interface: Raspberry Pi has 40 GPIO pins, screen has 12 pins. Match corresponding pins.
2. Connect HDMI: Use HDMI connector between screen and Pi.

5.2 Installation for Configured Image

If you have difficulty installing the driver, try our pre-configured images. No driver installation needed!

1. Connect touch screen LCD display to your Raspberry Pi
2. Download image from the table below
3. Unzip the downloaded image file
4. Format Micro SD card (8G/16G/32G recommended). Use SDFormatter
5. Use Raspberry Pi Imager to write image to SD card
6. Expand filesystem: sudo raspi-config → 6 Advanced Options → A1 Expand filesystem

5.3 Manual Installation of Touch Driver

Select the driver that matches your Raspberry Pi OS version:

5.4 Advanced Settings: Brightness & Color Adjustment

The display’s brightness, contrast, and colors can be updated by DDC/CI commands from the HDMI port DDC channel.

6How to Use as PC Monitor and Pi Zero

1. Connect computer HDMI output to the LCD HDMI interface using HDMI cable
2. Connect the LCD’s USB Power interface to the USB port of the device
3. If there are several monitors, unplug other monitor connectors first, use LCD as the only monitor for testing

7Related Docs

• SDFormatter – SD card formatting tool
• Raspberry Pi Imager – Official imaging tool
• PuTTY – SSH and telnet client
• Win32 Disk Imager – Disk imaging tool

8Tech Support

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