2.8 inch MIPI LCD Display Round AXS15260D

Product Introduction

The TFT-H028A29 series is a 2.8-inch round In-cell MIPI LCD Display module launched by HOTHMI, featuring a high-definition resolution of 540×540 pixels. This module supports the MIPI-DSI interface, integrates the high-performance AXS15260D driver IC, and offers multiple configuration options, including a cover glass version without touch and a version with capacitive touch. It is well-suited for diverse applications such as digital smart controls, wearable devices, and high-end instrument clusters.

In terms of display performance, it adopts a normally black panel, delivering a 1000:1 contrast ratio, NTSC 65% color gamut, and an 80-degree wide viewing angle in all directions, with backlight brightness up to 450±100 cd/m². Additionally, this MIPI LCD Display product boasts excellent industrial-grade reliability, with an operating temperature range of -20°C to +70°C and a storage temperature range of -30°C to +80°C. It has passed rigorous reliability and ESD tests, including 120-hour high-temperature operation and storage, making it an ideal choice for high-quality, small-form-factor circular display solutions.

TFT-H028A29ZUIAX4N30：

TFT-H028A29ZUIAX4G30：

Core Highlights and Key Advantages

As an industrial-grade MIPI LCD Display, the TFT-H028A29 series offers significant competitive advantages in optical, structural, and electrical performance:

• Perfect Circular Geometry with Ultra-High Pixel Density
  Traditional screens often exhibit noticeable jagged edges at the periphery when rendering circular UIs due to pixel granularity. This MIPI LCD Display module packs 540(H) x 540(V) pixels within a compact 2.8-inch active display area. The resulting ultra-high PPI delivers exceptionally fine image quality, ensuring that tiny icons, smooth instrument arcs, and detailed text appear flawlessly smooth, effectively eliminating edge aliasing.
• Advanced In-Cell Touch Technology for Ultimate Thinness and Lightness
  This MIPI LCD Display module adopts industry-leading In-Cell TFT LCD technology, integrating capacitive touch sensors directly into the liquid crystal substrate. This eliminates the need for a separate inductive glass layer and bonding gap required by traditional external touch panels. The In-Cell architecture not only significantly reduces overall device thickness and weight but also removes internal light reflections, greatly enhancing optical transmittance and enabling more responsive, fluid touch performance (supporting up to 5-point multi-touch).
• Full-Viewing-Angle IPS Technology
  Featuring a normally black liquid crystal panel mode, the module offers true full-viewing-angle characteristics. Combined with a 1000:1 ultra-high static contrast ratio and 65% NTSC color gamut coverage, it delivers deep, pure blacks and vivid, accurate color reproduction. Regardless of the viewing angle, the image remains free from color distortion or grayscale inversion.
• Robust Industrial-Grade Tolerance
  Designed and manufactured to stringent industrial standards, this MIPI LCD Display operates reliably across a wide temperature range of -20°C to +70°C and can be stored in extreme conditions from -30°C to +80°C. The backlight system has an effective lifespan of up to 30,000 hours under standard constant-current test conditions. The module has also passed rigorous environmental tests, including 120 hours of continuous high-temperature/high-humidity operation, high-intensity packaging impact, and drop/vibration tests, ensuring long-term dependability.

Detailed Pin Description and Interface Definition

To support high-resolution, high-speed image transmission while minimizing host-side pin usage, this MIPI LCD Display module features a high-density, low-power 30-pin standard MIPI interface configuration.

Product Applications

• High-End Smart Wearable Devices: The circular form factor represents an ideal fusion of traditional timepieces and modern technology. This screen’s ultra-high resolution perfectly renders highly realistic precision mechanical hands and dynamic watch face animations, while the low-power MIPI interface significantly extends the battery life of smartwatches.
• Smart Home and AIoT Whole-House Control Systems: An increasing number of smart appliances—such as air conditioner controllers (thermostats), multifunctional blenders, and electric ovens—are adopting designs with center-knob integrated displays. This module can serve as the core knob component, offering a sophisticated graphical interface with smooth In-Cell touch feedback.
• Automotive Electronics and Digital Cockpit Control Knobs: In the luxurious cabins of new energy vehicles, circular screens are increasingly embedded in multifunctional air-conditioning control knobs and electronic gear shifters. This screen’s broad operating temperature range (-20°C to +70°C) and 1000:1 contrast ratio enable it to easily meet stringent automotive component qualification tests.
• Medical Portable Diagnostic Devices: Various handheld oximeters, portable ECG monitors, and laboratory disc-type analyzers can leverage its accurate color reproduction and high clarity to precisely display waveforms and critical medical indicators.

Technical Q&A of MIPI LCD Display

Q1: In small-size, high-resolution screen designs, why does this module prioritize the MIPI DSI interface over traditional SPI or RGB interfaces?

A1: This is precisely the core technical advantage of a high-performance MIPI LCD Display. With 540×540 pixels on this 2.8-inch circular screen, a traditional SPI interface would be severely bandwidth-limited. Refreshing such a high pixel density would likely result in frame rates below 15Hz, causing significant lag and screen tearing. While a parallel RGB interface could meet bandwidth requirements, it would necessitate at least 20 or more signal lines for image data. This would lead to extremely congested PCB routing on a compact circular board and significantly increase the risk of electromagnetic interference.

In contrast, the MIPI DSI interface utilizes low-voltage differential signaling (LVDS) and requires only a minimal number of pins (clock and data lines) to deliver multi-gigabit-per-second data bandwidth. It effortlessly supports smooth 60Hz frame rate refresh while keeping power consumption and EMI noise at the industry’s lowest levels. This makes it the inevitable and optimal choice for high-resolution circular displays.