3.5 inch Touch TFT Display ST7365P MIPI DSI

Product Overview of Touch TFT Display

The TFT-H035A27HVTST4C20 is a high-performance 3.5-inch capacitive touch screen LCD module featuring a sharp 320(RGB)x480 resolution and a normally white display mode, with color reproduction covering 60% of the NTSC color gamut. This Touch TFT Display adopts an advanced MIPI DSI 1 Lane interface, driven by the ST7365P driver IC and integrated with the GT911 capacitive touch controller for smooth and responsive touch interactions. Electrically, it operates with VCI=3.0～3.3V and IOVCC=1.8～3.3V, while the backlight driving conditions are Vf=3.2±0.2V and If=120mA, delivering a typical brightness of 400 cd/m².

The module is built for rugged environmental adaptability, with an operating temperature range of -20℃ to +70℃ and a storage temperature range of -30℃ to +80℃. With an overall thickness of just 4.39±0.4mm, it is well-suited for portable instruments, smart meters, automotive displays, and other industrial-grade applications.

Core Technology Highlights

• High-Bandwidth MIPI DSI Interface: This Touch TFT Display utilizes a MIPI DSI 1 Lane high-speed serial interface, which consumes significantly fewer pins than traditional RGB or MCU interfaces, greatly reduces electromagnetic interference, and enhances overall system data throughput and display refresh rates.
• Precision Industrial-Grade Touch: Equipped with the field-proven GT911 chip, this capacitive touch solution supports 5-point touch detection, ensuring sensitive and reliable operation even in demanding environments.
• Superior Color Expression: With a normally white display mode and 60% NTSC color gamut coverage, the screen delivers vibrant, rich, and well-saturated visuals.
• 400 cd/m² Backlight System: Under the constant-current conditions of Vf=3.2±0.2V and If=120mA, the backlight achieves a typical luminance of up to 400 cd/m², ensuring clear visibility under various indoor lighting conditions.
• Wide-Temperature Operation: This Touch TFT Display operates reliably from -20℃ to +70℃ and can be stored from -30℃ to +80℃, making it capable of withstanding the thermal extremes commonly found in industrial environments.

Pin Configuration

The module features two main interface areas: the TFT 20-Pin main interface and the CTP 6-Pin touch panel interface.

TFT Display Pins (20-Pin Interface)：

CTP Touch Panel Pins (6-Pin Interface)：

Typical Applications of Touch TFT Display

Thanks to its cost-effective size, MIPI high-speed transmission, and precise capacitive touch support, this 3.5-inch Touch TFT Display is widely adopted in the following scenarios:

• Smart Home Control Panels: Ideal for embedded wall switches, central air-conditioning control panels, or local display modules for smart refrigerators.
• Handheld Terminals and Measurement Instruments: Its compact form factor and low logic voltage of 1.8V~3.3V make it perfect for multi-parameter patient monitors, handheld thermal imagers, portable industrial inspection devices, and more.
• IoT and Commercial Equipment: Commonly found in smart POS terminals, 3D printer consoles, smart charging pile display units, and parcel locker interactive terminals.
• Automotive and Security Control: Suitable for car backup radar displays, dashcam screens, and facial recognition/password touch display modules for advanced access control systems.

Technical FAQ of Touch TFT Display

Q1: Why choose a MIPI DSI interface for this 3.5-inch screen, and what are its advantages over ordinary SPI or RGB interfaces?

A1: Traditional 320×480 resolution panels often require over 20 MCU pins in 16-bit/18-bit RGB interface modes, and high-speed parallel transmission tends to generate electromagnetic interference. In contrast, this Touch TFT Display integrates a MIPI DSI 1 Lane interface, which condenses data and clock lines into just a few differential pairs (DCP/DCN, D0P/D0N). This not only dramatically reduces PCB routing space and host controller pin usage but also delivers high data bandwidth at high frame rates while maintaining extremely low electromagnetic emission characteristics—greatly facilitating compliance with various industry radio and compatibility certifications.

Q2: How does the GT911 touch panel communicate with the host system, and what are the key electrical debugging points?

A2: The touch panel communicates with the host MCU or single-board computer (such as Raspberry Pi or Linux core boards) via the standard I2C bus (SCL, SDA). When a finger touch event is detected, the GT911 sends an interrupt signal through the INT pin to notify the host to read the current touch coordinate data. Proper pull-up resistors on the I2C lines, correct voltage matching (1.8V~3.3V for IOVCC), and careful handling of the interrupt response timing are essential for stable and noise-free touch performance.