2.8-inch In-Cell MIPI Round LCD Display Module

As smart wearables, automotive cockpits, smart home devices, and portable medical equipment continue to iterate rapidly, small-size round displays have become the core visual interaction interface for high-end intelligent hardware. Market demands for screens are no longer confined to high-definition resolution—they increasingly require high refresh rate smoothness, slim and lightweight integration, low-power endurance, and industrial-grade stability with robust anti-interference performance. Leveraging its deep expertise in display technology, HOTDISPLAY proudly introduces the TFT-H028A29ZUIAX4N30 series 2.8-inch In-Cell MIPI Round LCD Display Module, delivering a comprehensive high-quality solution for small-size round display applications.

Product details link: TFT-H028A29ZUIAX4N30

Core technological innovation: MIPI-DSI interface, redefining the benchmark for small-sized high-definition displays

Currently, the small-size display industry widely adopts traditional SPI and RGB parallel interfaces. However, in high-end applications demanding high resolution and high frame rates, the technical limitations of these two interface types have become increasingly prominent, forming a core bottleneck for product performance upgrades. The TFT-H028A29ZUIAX4N30 series abandons conventional interface solutions and is fully equipped with the MIPI-DSI professional high-speed display interface. Leveraging a mobile-industry-standardized transmission architecture, it thoroughly resolves the pain points of traditional interfaces—insufficient bandwidth, complex wiring, high power consumption, and severe interference—making it the optimal interface choice for 2.8-inch In-Cell MIPI Round LCD Display Module with high PPI density.

Compared with traditional interfaces, the MIPI-DSI interface offers a more efficient transmission solution for small-size high-definition displays. Under the 540×540 high-resolution requirement, the traditional SPI interface, constrained by data throughput, often struggles to balance high refresh rates with real-time dynamic display needs. Dynamic images suffer from stutter and tearing, and operating latency is noticeable—making it entirely unsuitable for scenarios such as animated watch faces, real-time data waveforms, or dynamic touch interaction. The traditional RGB parallel interface, while marginally meeting bandwidth demands, typically requires numerous data lines and control signals, occupying substantial PCB space. On an extremely compact circular PCB of 2.8 inches, this leads to severe routing congestion and space shortages, while also significantly increasing electromagnetic interference risks and complicating hardware design, debugging, and mass production.

In contrast, the MIPI-DSI interface employs a low-voltage differential signaling architecture (based on the MIPI D-PHY physical layer). Through high-speed serial data channels, it achieves high-bandwidth image transmission with very few pins, readily meeting 60Hz-level dynamic display requirements. Dynamic images remain smooth, free of ghosting and tearing, with touch response synchronized in real time. Moreover, the streamlined pin design greatly simplifies hardware routing, conserves internal device space, reduces EMI risks, and lowers mass-production costs. More critically, the MIPI interface features dedicated low-power optimization mechanisms that dynamically adjust transmission power consumption—effectively controlling energy use under both high-frequency operation and standby modes. This significantly extends the battery life of power-constrained portable devices such as smart wearables and portable medical equipment, perfectly aligning with the core requirements of portable intelligent hardware.

MIPI interface empowers and unlocks all-around ultimate product performance

Relying on the high-speed and stable transmission base of MIPI-DSI, the optical display, touch interaction and structural design advantages of the TFT-H028A29ZUIAX4N30 series screens are fully released, realizing deep synergy between interface performance and hardware configuration, and creating a comprehensive and superior experience.

1. Ultra-high definition, alias-free image quality, smooth and fluid dynamic display

The product features a perfectly circular display area of 2.8 inches, paired with an ultra-high 540×540 pixel resolution. The exceptionally high PPI density eliminates the jagged edges and blurriness commonly seen in UI rendering on traditional circular screens, ensuring that tiny icons, precision instrument arc lines, and delicate text are all reproduced with pinpoint accuracy. Thanks to the high-bandwidth transmission capability of the MIPI-DSI interface, it readily meets 60Hz-level dynamic display requirements. Whether it is the moving mechanical hands of a smartwatch, the interactive animations of an automotive knob, or real-time data waveforms on medical devices, all deliver smooth, fluid, and lag-free visual performance—elevating the dynamic viewing experience to a new level.

Meanwhile, the screen employs a normally-black IPS full-viewing-angle panel, featuring an ultra-high static contrast ratio of 1000:1, 65% NTSC color gamut coverage, wide viewing angles exceeding 80° in all directions, and a backlight brightness of up to 450 cd/m². With deep, pure black backgrounds, accurate and vivid color reproduction, and the lossless data transmission characteristic of the MIPI interface, the risk of image anomalies during high-speed transfer is effectively minimized. The display remains crisp and consistent from any viewing angle, delivering image quality that far surpasses competing products in the same size class—making it the definitive 2.8-inch In-Cell MIPI Round LCD Display Module for premium applications.

2. In-Cell slim touchscreen, providing sensitive and lag-free interaction.

This series of modules is available in two variants: a standard version with a non-touch glass panel and an upgraded version with capacitive touch. The touch variant adopts the industry-advanced In-Cell embedded touch technology, which integrates the touch sensor directly into the liquid crystal substrate—eliminating the need for an external touchscreen glass layer and adhesive gap. This significantly reduces screen thickness and overall device weight.

Leveraging the high-speed data transmission advantages of the MIPI-DSI interface, 5-point capacitive touch signals can be synchronously transmitted and responded to in real time, thoroughly eliminating issues such as touch lag, offset, or delay, and delivering a smooth, precise tactile experience. Meanwhile, the In-Cell architecture eliminates internal light reflections and improves light transmittance. Combined with the MIPI interface's low-interference transmission characteristics, touch stability is further enhanced, maintaining accurate interaction even under complex operating conditions. This makes the 2.8-inch In-Cell MIPI Round LCD Display Module perfectly suited for high-frequency operation scenarios such as smart knobs and touch-control watch faces.

3. Industrial-grade reliability, stable adaptation across all scenarios

Leveraging the MIPI interface's strong anti-interference capability and high transmission stability, combined with mature industrial-grade manufacturing processes, the TFT-H028A29ZUIAX4N30 series—built around the 2.8-inch In-Cell MIPI Round LCD Display Module—delivers exceptional environmental adaptability and durability. The product operates within a temperature range of –20°C to +70°C and can be stored at temperatures from –30°C to +80°C, making it fully capable of handling extreme scenarios such as in-vehicle exposure to high-temperature sunlight, outdoor low-temperature environments, smart-home constant-temperature conditions, and the varied usage environments of portable medical devices.

In addition, the product has passed rigorous reliability and electrostatic discharge tests, including 120-hour continuous high-temperature operation, high-temperature/high-humidity storage, packaging impact, and drop/vibration tests. The backlight has a standard service life of up to 30,000 hours. The MIPI interface's low electromagnetic interference characteristics effectively prevent screen flickering and data transmission anomalies in complex electromagnetic environments typical of industrial and automotive applications, ensuring stable and reliable long-term operation while significantly reducing post-deployment failure rates.

Precise adaptation across all scenarios, empowering the upgrade of high-end smart hardware

• High-end smart wearable devices

The perfectly round dial fits the ergonomic design of the watch, the MIPI low power consumption feature effectively extends the device's battery life, and the 60Hz high refresh rate screen accurately reproduces the dynamic effect of mechanical hands, creating a high-end wearable visual experience.

• Smart Home & AIoT Whole House Control System

It is compatible with central control knob display scenarios of devices such as air conditioner thermostats, smart ovens, and multi-functional food processors. The high-speed touch response enables seamless human-computer interaction, and the slim structure is in line with the trend of miniaturized device design.

• Automotive Electronic Digital Cockpit

With a wide temperature range suitable for complex automotive operating conditions, MIPI high-stability transmission improves data transmission stability in complex electromagnetic environments, and a 1000:1 high contrast ratio ensures clear visibility in both strong and low light conditions. It meets stringent certification standards for automotive components and is compatible with automotive air conditioning knobs, electronic gear shift levers, and circular interactive screens.

• Portable medical diagnostic devices

Lossless high-definition transmission accurately reproduces medical waveforms, test data and key indicators; touch control is sensitive and precise; industrial-grade stability ensures long-term stable operation of medical equipment; compatible with pulse oximeters, portable electrocardiographs and laboratory analysis equipment.

Product Core Data

MIPI core capabilities enable the optimal solution for small-size displays

Compared to similar products in the industry, the core competitiveness of the HOTDISPLAY TFT-H028A29ZUIAX4N30 series stems from the comprehensive capabilities of MIPI-DSI interface technology. Compared to traditional SPI and RGB interface screens, this product achieves a unified advantage of high bandwidth and high frame rate, low power consumption and low interference, small size and easy integration, and high stability and reliability.

Ultra-high PPI ultra-high definition image quality, IPS full-viewing angle and wide color gamut, In-Cell thin and light touch, and all-weather industrial-grade reliability, combined with the ultimate performance experience brought by the MIPI interface and the advantages of minimalist hardware design, make the TFT-H028A29ZUIAX4N30 a high-quality benchmark product in the 2.8-inch circular small-size display field. It provides high-performance, highly adaptable, and cost-effective customized display solutions for high-end scenarios such as smart wearables, automotive electronics, smart homes, and portable medical devices.

Meanwhile, HOTDISPLAY offers customization services for display size, interface solutions, touch methods, and cover plate structures, and can provide complete display module solutions according to the structural requirements of customer equipment.

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