Description
I. Detailed Product Description
The 1.28-inch Round LCD Screen display module (model: HTM-H013A6-SPI-V0) from HOTHMI features a standard resolution of 240x3RGBx240 and delivers full-viewing-angle visual performance. This Round LCD Screen integrates the GC9A01 driver IC and a built-in drive circuit, supporting flexible 3-wire or 4-wire SPI interface communication with an operating voltage range of 2.5V to 3.3V.
In terms of performance, it achieves a constant-current tested brightness of up to 750 cd/m² and offers strong environmental adaptability, with a TFT operating temperature range of -20°C to +70°C and a storage temperature range of -30°C to +80°C. Structurally, it features compact and precise dimensions: the PCB width is approximately 37.03mm, height 38.90mm, and the TFT active display area has a diameter of 32.40mm. The overall thickness is well controlled, and it is equipped with a pin-header interface of 5.60mm in height, making the form factor perfectly suited for embedding into various circular enclosures.
II. Product Highlights
- Full IPS-like Viewing Angle: With 240×240 resolution and 80/80/80/80 wide viewing angles, this Round LCD Screen ensures graphics remain sharp, vivid, and eye-catching from nearly any direction.
- 750 cd/m² High Brightness: Under constant-current backlight testing, the screen brightness reaches 750 cd/m². This strong parameter makes it remaining clearly readable in high-ambient-light or semi-outdoor environments—far surpassing ordinary indoor displays.
- Industrial Wide Temperature Operation: The TFT operating temperature spans -20°C to +70°C, with storage capability from -30°C to +80°C. Whether in freezing outdoor wearables or scorching in-vehicle enclosed spaces, this Round LCD Screen delivers stable image output.
- High-speed SPI Interface: Compatible with 3-wire and 4-wire SPI serial buses, it not only offers fast data transfer but also greatly simplifies external circuitry, enabling more elegant and compact PCB layouts.
- Wide Voltage Low-power Design: Supporting an operating voltage of 2.5V to 3.3V, this Round LCD Screen aligns perfectly with various low-power microcontrollers and lithium-battery power rails.
III. Pin Definition
This Round LCD Screen module connects to the host control board via a standard 8-pin signal header.
IV. Target Applications
With its naturally symmetric geometric form, the circular screen has become “irreplaceable” as a design core in many specific vertical sectors.
- Smart Wearables & Fitness: An excellent choice for developing adult smartwatches, children’s positioning watches, fitness bands, and professional diving/mountaineering instruments. The circular UI perfectly matches traditional watch aesthetics.
- Automotive & Motorcycle Gauges: Widely used in electric motorcycles, bicycle smart speedometers, passenger-side multifunctional mini dashboards, and vintage sports car gauge retrofits—displaying speed, battery level, navigation turn cues, and other critical information.
- Smart Home & Rotary Switch Panels: Modern high-end home appliances (such as smart microwaves, premium washing machines, thermostat panels, and wall-mounted multifunctional rotary switches) are increasingly adopting “screen-integrated knob” designs. The compact physical footprint of this Round LCD Screen fits perfectly into the center area of various rotary controls.
- Industrial Instruments: Benefiting from its -20°C to +70°C industrial operating temperature range and 750 cd/m² high brightness, it is suitable for outdoor handheld detectors, power monitoring meters, and circular viewing windows on various industrial automation control panels.
- Creative IoT Devices & Desktop Aesthetics: Ideal for developing desktop mini astronaut capsule figurines, anime companion screens, electronic pet devices, smart charging station animation displays, and other tech-forward geek hardware.
V. FAQ
Q1: Can this Round LCD Screen module be driven directly by a 5V microcontroller, such as a standard Arduino UNO?
A1: The recommended operating voltage for this module is 2.5V to 3.3V. Directly connecting 5V logic signals (e.g., SCL, SDA) from a 5V microcontroller like the traditional Arduino UNO may cause permanent damage to the GC9A01 driver IC due to excessive logic levels. It is advisable to add a level shifter between the 5V controller and this module, or alternatively, use a main control board that natively supports 3.3V logic levels, such as ESP32, Raspberry Pi Pico, or STM32.
Q2: How does the 750 cd/m² brightness perform in real-world use, and how should the backlight pin BLEN be controlled?
A2: Typical laptop or smartphone screens usually have brightness levels between 300 and 500 cd/m². This Round LCD Screen, with its 750 cd/m² high-brightness specification, falls into the high-brightness category, ensuring that numbers and icons on the UI remain clearly legible even under intense indoor lighting or in semi-outdoor environments. The BLEN pin is the backlight enable pin: if brightness adjustment is not needed, you can connect it directly to 3.3V to keep the backlight always on; for power saving or ambient-light-based automatic brightness adjustment, you can connect it to a PWM pin on the host board and adjust the duty cycle to achieve smooth, high-precision backlight brightness control.
From minor concept tweaks to full custom redesign & development, our engineering team offers end-to-end technical support. Feel free to contact us for custom display demands or technical issues during product selection.
