what is UART Display
A UART display, also called UART HMI or serial TFT screen, is an intelligent color touchscreen module that communicates with microcontrollers (STM32, ESP32, Arduino, etc.) via simple UART (TTL level) serial commands.
It features a built-in GUI processor, font library, and image storage. Developers design professional interfaces (buttons, gauges, text, graphs, pages) using PC configuration software, then upload the project. The MCU only sends short commands to update content, switch screens, or read touch events—no complex graphics code required.
Advantages: Low MCU resource usage, fast development, capacitive/resistive touch support, reliable protocol.
Common sizes: 1.5"–15", widely used in industrial control, medical devices, smart appliances, and instruments.
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![4.3 Inch UART LCD Display]()
4.3 Inch UART LCD DisplaySize:4.3inchResolution:800x(RGB)x480Interface:UARTDisplay Mode:IPSActive Area:93.60 x 56.16mmOutline:121.90 x 73.20 x 14.30mmBrightness:250cd/m²Remark:HMI Module -
![7-Inch Industrial TFT Serial Screen]()
7-Inch Industrial TFT Serial ScreenA TN TFT-LCD powerhouse with 1024x600 resolution, projected capacitive touch, and serial simplicity via UART or SPI. -
![1.4 Inch Square IPS TFT LCD Display Module]()
1.4 Inch Square IPS TFT LCD Display ModuleSize: 1.4 inchResolution: 240(RGB)×240 pixelsInterface: SPI (4-wire)Display Mode: IPS Brightness: 580 cd/m² -
![18.5 Inch UART Display]()
18.5 Inch UART DisplayScreen Size: 18.5 inches – ideal for detailed dashboards and operator panels where visibility matters.Resolution: 1366 x 768 (WXGA) – sharp enough for text, icons, graphs, and multi-window -
![2.4 Inch UART LCD Display]()
2.4 Inch UART LCD DisplayScreen Size: 2.4 inches diagonalResolution: 240 × 320 pixels (QVGA)Touch Type: Capacitive touchscreen for multi-point precision and glove-friendly operationInterface: Simple UART serial port – just -
![15.6 Inch UART Display]()
15.6 Inch UART DisplayModel: Customizable 15.6inch UART HMI SeriesScreen Size: 15.6 inches diagonalInterface: UART (TTL/RS232/RS485 compatible)Touch Type: Multi-point capacitive touch screenKey Advantage: Plug-and-play -
![12.1 Inch UART LCD Display]()
12.1 Inch UART LCD DisplayFeatures:Based on T5L2, running DGUS II system, medical grade products.12.1-inch，1280*800 Pixels resolution, 16.7M Colors, IPS-TFT-LCD, wide viewing angle. Support RS232 and RS485 communication. -
![9.7 Inch LCD UART Display]()
9.7 Inch LCD UART DisplayFeatures:Based on T5L2, running DGUS II system, commercial grade. 9.7-inch, 1024*768 Pixels resolution, 16.7M Colors, TN-TFT-LCD, normal viewing angle. Capacitive touch screen. 16MB memory, -
![8inch UART LCD Display]()
8inch UART LCD DisplayFeatures:Based on T5L2, running DGUS II system, commercial grade. 8.0-inch, 1024*768 pixels resolution, 16.7M colors, IPS-TFT-LCD, wide viewing angle. Capacitive touch screen. -
![10.1 Inch UART LCD Display]()
10.1 Inch UART LCD DisplayFeatures:Based on T5L2, running DGUS II system, commercial grade.10.1-inch, 1024*600 pixels resolution, 16.7M colors, IPS-TFT-LCD, wide viewing angle. Capacitive touch screen. -
![7inch UART Display]()
7inch UART DisplayFeatures:Based on T5L2, running DGUS II system, commercial grade. 7.0-inch, 1024*600 pixels resolution, 16.7M colors, IPS-TFT-LCD, wide viewing angle. Capacitive touch screen. -
![7inch TFT Serial Screen]()
7inch TFT Serial ScreenOur 7-inch TFT Serial Screen is exactly that: A TN TFT-LCD powerhouse with 1024x600 resolution, projected capacitive touch, and serial simplicity via UART or SPI.
Customized UART Display Solutions
UART display (also known as UART LCD display, UART TFT display, or LCD UART module) shares the core trait of simple UART asynchronous serial communication (TTL level), requiring only TX/RX lines plus power/GND to connect with MCUs like STM32, ESP32, or Arduino.
- Built-in independent GUI processor, font library, image storage, and touch controller—no complex graphics rendering on the host MCU.
- Reliable, asynchronous protocol (no clock line), common baud rates 9600–115200 bps (often 115200).
- Extremely low MCU resource usage (minimal RAM/Flash/CPU).
- Supports resistive or capacitive touch with fast response and standardized commands (e.g., frame headers like 0x5A 0xA5).
- High cost-performance, short development cycle, and professional-looking interfaces.
Typical Usage Method
- Use manufacturer PC software (e.g., Nextion Editor, STONE Tool, DWIN DGUS) to drag-and-drop design UI elements (buttons, text, gauges, graphs, pages) and upload to the UART display module.
- Initialize UART on the MCU (match baud rate, 8N1 format).
- Send short serial commands to update content (page switch, text refresh, value change) or read touch events. Example: For Nextion-style, send "t0.txt="Hello"" + 0xFF 0xFF 0xFF terminator.
- The UART TFT display reports touch/events back; MCU parses and handles logic. No pixel-level drawing needed—MCU only manages simple string/byte commands.
Interface Types, Accessories, and Installation
Interface types:
- Primary: TTL UART (3.3V/5V compatible, TX/RX/GND/5V).
- Others: RS232 (±12V), RS485 (long-distance differential), occasional CAN or WiFi.
Common accessories:
- DuPont/jumper wires or pin headers.
- USB-to-TTL adapter (e.g., CH340/PL2303 for PC debugging).
- Power adapter (usually 5V/12V depending on size).
- Optional enclosure, bracket, or stylus.
Installation:
- Panel embedment: Cut opening and secure with screws/VESA mounts.
- Direct connection to MCU boards via wires. Tips: Match voltage levels (3.3V/5V), avoid long cables (>1m) without isolation/RS485, ensure solid grounding and stable power.
Application Fields and Scenarios
FAQ
Q: What is a UART serial screen?
A: It's a smart TFT touchscreen that you control with simple serial commands (UART/TLL). Unlike regular TFTs, it handles the UI and touch itself — your MCU just sends short instructions.
Q: What baud rate should I use?
A: Most use 115200 by default. Make sure your microcontroller matches exactly (8N1). Start with 115200 for testing.
Q: Why is the screen black or restarting?
A: Common reasons: Not enough power (needs stable 5V/≥500mA);
Backlight off (send dim command);
TX/RX crossed or GND missing; Wrong voltage or bad connection
Q: How do I connect it to Arduino/ESP32?
A: Basic wiring: Screen TX → MCU RX;
Screen RX → MCU TX;
GND to GND;
VCC to 5V or 3.3V (match your screen);
Use level shifter if voltages differ.
Q: How to upload a project?
A: Easiest: Put .tft file on microSD card → insert → power on;
Or use editor + USB-TTL cable;
Errors usually mean wrong model selected or bad file/power during upload.
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