Square Display 1.3inch SPI TFT LCD ST7789H2

Square Display Product Introduction

This 1.3-inch Square Display features a clear resolution of 240(H) x 3(RGB) x 240(V) pixels, with an active area of 23.40mm x 23.40mm and compact overall dimensions of just 26.00mm x 29.15mm x 1.95mm. The product adopts a unique full viewing angle (Free O’clock) design, ensuring a good visual experience for users from different angles.

In terms of hardware configuration, this Square Display is equipped with an efficient ST7789H2 driver IC and uses an SPI 4L communication interface, with a standard driving voltage of 2.8V (VCI = 2.8V). The screen features a bright white LED backlight, but please note that this model does not include touch functionality. Additionally, this Square Display offers excellent environmental adaptability, with a wide operating temperature range of -20°C to +70°C and a storage temperature range of -30°C to +80°C, making it highly suitable for stable operation in various industrial or consumer electronic devices.

Engineers do not have development capabilities? It doesn’t matter. We also provide this product with a driver board model HTM-H013A2-SPI-A01. The driving method is simple and easy to operate.

Core Highlights: Why Choose This 1.3-Inch Square Display?

This 1.3-inch Square Display (Model: TFT-H013A2QQSIST3N10) represents an advanced level of micro LCD technology. Whether considering display quality, power efficiency, or environmental tolerance, it offers the core competitiveness needed for successful hardware products:

• Perfectly Symmetrical Square Display Visual Aesthetics: Features a full-color high resolution of 240×3RGB×240. The 1:1 square screen ratio eliminates the visual bias of traditional rectangular screens, making it more intuitive for displaying square QR codes or center-symmetrical UI designs.
• Normally Black Mode and Full Viewing Angle (Free O’Clock) Experience: This screen uses Transmissive and Normally Black technology. When powered off or displaying black, it achieves extremely high black depth and excellent contrast. Thanks to the Free O’Clock design, users can view the screen from any direction without color shift or distortion.
• Ultra-Thin, Highly Integrated Structural Design: The overall dimensions are only 26.00 × 29.15 × 1.95 mm (excluding the FPC cable), with a thickness of less than 2 mm. This compact structure saves significant internal space for the final product, making it an ideal choice for thin and light portable wearable devices.
• Excellent Industrial-Grade Environmental Tolerance: Its operating temperature ranges from -20°C to +70°C, and its storage temperature ranges from -30°C to +80°C. This allows it to easily withstand outdoor freezing conditions or high-temperature industrial environments, ensuring stable operation throughout the year.

Interface Type and High-Speed 4-Line SPI Communication

In smart hardware development, the pin resources of the main control chip (such as MCU, ESP32, STM32, etc.) are often very valuable. This Square Display uses an efficient 4-Line Serial Peripheral Interface (SPI 4L).

Compared with traditional parallel interfaces (RGB or MCU 8080), the SPI 4L interface minimizes the required communication lines. It only needs a clock line (SCK), a data line (SDA), a data/command control line (D/CX), and a chip select line (CS), along with a reset (RESX), to achieve refresh rates of tens of megahertz. This low pin-count feature allows developers to use lower-cost main control chips with fewer pins, significantly simplifies PCB routing, and shortens product development cycles.

Pin Definition and Detailed Wiring Instructions

To facilitate circuit board (PCB) design and hardware debugging by engineers, the following is a detailed pin function description and standard wiring reference for the 10-Pin FPC interface of this Square Display. The pin pitch of this interface is 0.50mm, and the cable end has a PI Stiffener with a thickness of 0.30mm, ensuring plug durability and stable electrical connections.

Pin Description

Standard Wiring Instructions

When building the actual hardware circuit, please follow these connection specifications:

• Power Supply System: Connect VCI to a 2.8V or 3.3V regulated power supply on the mainboard (ensure IOVCC voltage matching; it is generally synchronized internally). It is recommended to place a 0.1μF and a 10μF filter capacitor in parallel near the VCI pin to filter out high-frequency noise.
• SPI Control Lines: Connect the main control MCU’s SPI_CS, SPI_CLK, and SPI_MOSI (Master Out Slave In) to the screen’s CS, SCK, and SDA pins respectively. Connect D/CX to any general-purpose GPIO on the MCU.
• Reset Control: It is recommended to connect RESX to a GPIO on the MCU that has hardware reset capability. During initialization, pull the line low for more than 10ms and then pull it high to achieve hardware initialization of the screen.

High-Brightness Backlight Design and Circuit Reference

For this Square Display used outdoors or in bright light, the balance between backlight brightness and power consumption is critical.

• Backlight Parameters: This display integrates a high-efficiency white LED. Its typical forward voltage (Vf) is 3.2V, and its typical forward current (If) is 40mA.
• Screen Brightness: Driven by a standard 40mA current, the LCM surface brightness can reach 350 cd/m² (Typical). This brightness ensures the screen displays extremely vivid and delicate colors indoors while maintaining good readability in typical outdoor shaded conditions.

Wide Range of Product Application Scenarios

Thanks to its perfect square aspect ratio and compact size, this 1.3-inch Square Display shows high application value across several vertical industries:

• Smart Wearables and Health Monitoring: It is an excellent choice for stylish smartwatches, smart wristbands, and battery level displays.
• Smart Home and IoT Control Panels: Suitable for embedding into wall smart switches, thermostat panels, and smart home appliances (e.g., coffee machines, air purifiers).
• Industrial Instruments and Portable Measurement Devices: Can be used in handheld digital multimeters, gas detectors, thickness gauges, etc. The full viewing angle technology ensures workers can accurately read data in complex industrial environments, whether looking from a high vantage point or a side angle.
• Consumer Electronics and Desktop Gadgets: Widely used in creative hardware such as secondary screens for miniature digital cameras, desktop mini TVs, pixel art electronic pets, and electronic dynamic badges.                                                                                                                                        

Technical FAQ

Q1: Which driver IC does this 1.3″ Square Display use? Are there any precautions when writing firmware drivers?

A1: This display uses the widely available, stable, and popular ST7789H2 driver chip. For firmware development, you can use very mature open-source graphics libraries (such as LVGL, TFT_eSPI, or Ucglib). When writing the initialization register code, note that while the screen’s resolution is standard 240×240, the driver IC itself supports larger resolutions (e.g., 240×320). Therefore, when setting the display starting point for coordinates (Memory Access Control, register 36h), you must correctly configure the offset to ensure the image is centered. This prevents issues like image shift, screen corruption, or black borders on the edges.

Q2: Is the FPC cable fragile? What are the design considerations?

A:The FPC is designed for durability, but proper bending radius is key.

This spi lcd display uses an FPC-10PIN connector. When integrating, follow standard design rules: if bending the FPC is necessary, maintain a bending radius greater than 1.5mm. Avoid bending at the connector root (leave at least 2mm clearance) and secure the FPC with tape. For applications requiring repeated connection or a more rugged setup, consider the carrier board version (e.g., HTM-H013A2-SPI-A01), which includes a driver board and pin headers for easier use with development boards like Arduino.

If you have any further requirements, please feel free to contact us.