HOTHMI 2.4 inch Sunlight Readable LCD Screen UART

Product Introduction

HTM-H024A16-UART-A02 is a 2.4 inch Sunlight Readable LCD Screen designed for industrial control equipment, embedded devices, outdoor instruments, and compact human-machine interface (HMI) terminals. The module uses a 240 × 320 pixel TFT LCD with a Normally Black display mode. Its LCM provides a typical brightness of 1500 cd/m² and a 70% NTSC color gamut, making this Sunlight Readable LCD Screen suitable for equipment that requires clear visual information under relatively high ambient light conditions.

The HTM-H024A16-UART-A02 integrates an EzUILet display control solution and communicates with the host controller through a UART (TTL) interface. Instead of requiring the main MCU to directly manage the LCD display timing and driving process, the display module handles display-related operations internally. This architecture can reduce display development work on the MCU side and is suitable for embedded systems with limited processing resources.

The module operates from a DC 5.0V ±0.3V power supply, with a specified current of 500mA. The TFT operating temperature range is -20°C to +70°C, while the storage temperature range is -30°C to +80°C. For a Sunlight Readable LCD Screen used in outdoor or high-light environments, system-level optical and thermal conditions should also be considered. The actual readability depends on ambient illumination, cover lens transmission, surface reflection, enclosure design, and installation angle.

Product Specifications

Product Highlights

1500 cd/m² High Brightness for High Ambient Light

The HTM-H024A16-UART-A02 provides a typical LCM brightness of 1500 cd/m², giving this Sunlight Readable LCD Screen additional brightness headroom compared with conventional lower-brightness indoor LCD modules.

For outdoor instruments, industrial control equipment, and devices installed near windows or other bright locations, the display can present real-time measurement values, operating status, alarm information, and menu interfaces. The high-brightness configuration helps improve the visibility of displayed information when ambient illumination is elevated.

For applications directly exposed to sunlight, engineers should evaluate the complete optical structure rather than considering brightness alone. Cover glass transmission, anti-reflective treatment, surface reflection, viewing angle, and enclosure design can all affect the final performance of a Sunlight Readable LCD Screen.

UART (TTL) Interface with EzUILet Display Control

The module uses a UART (TTL) communication interface together with an EzUILet display control solution. The host MCU communicates with the display through TX/RX signals instead of directly managing the timing required by a conventional raw TFT interface.

This architecture separates display processing from the main equipment control logic to a certain extent. For MCU-based systems with limited memory, processing capability, or available display resources, this Sunlight Readable LCD Screen can simplify the display-side development process and reduce the amount of display-driving work handled by the host controller.

128M-bit Resource Storage with USB Update

The module integrates 128M-bit resource storage and supports USB-based resource updates. Display resources such as icons, fonts, images, and multi-page UI elements can be stored on the display side.

This structure is useful for equipment where the UI may need to be modified during development or after deployment. Engineers can update display resources through USB without necessarily changing the main MCU application logic, depending on the actual UI architecture.

For a Sunlight Readable LCD Screen used in industrial equipment, this resource-management structure can also simplify maintenance when different display pages, graphical elements, or operating instructions need to be updated.

Compact 2.4 Inch Format with 240 × 320 Resolution

The 2.4 Inch, 240 × 320 pixel format provides a compact display area for embedded equipment where installation space is limited. The Normally Black TFT panel supports U80/D80/R80/L80 typical viewing directions and operates across a TFT temperature range of -20°C to +70°C.

The combination of 1500 cd/m² brightness, UART communication, EzUILet control, and compact dimensions makes this Sunlight Readable LCD Screen suitable for small industrial and embedded devices where both installation space and display readability need to be considered.

Pin Description

Product Applications

Industrial Measurement and Inspection Equipment

The module can be integrated into portable testers, environmental monitoring instruments, sensor terminals, and compact measurement devices. The 2.4 Inch display area can present measurement values, units, operating status, and alarm information within a relatively small enclosure.

The host MCU can send measured data to the display through UART, while the display module handles the corresponding UI presentation. With 1500 cd/m² typical brightness, this Sunlight Readable LCD Screen can be considered for equipment used in workshops, semi-outdoor locations, or other environments with elevated ambient illumination.

Outdoor Instruments and Control Terminals

This display is suitable for outdoor monitoring equipment, compact controllers, and parameter display terminals where screen readability under strong ambient light is an important design consideration.

As a Sunlight Readable LCD Screen, the 1500 cd/m² brightness provides a higher brightness level for displaying numerical values, status indicators, and menu information in bright environments. For direct-sunlight applications, engineers should conduct validation under actual illumination conditions.

The final optical performance should also be evaluated together with the enclosure, cover lens, surface treatment, viewing angle, and installation position.

Compact Embedded HMI Equipment

The HTM-H024A16-UART-A02 can be used in industrial controllers, intelligent instruments, equipment interfaces, and other compact HMI products.

The combination of EzUILet control, 128M-bit resource storage, USB resource updating, and UART communication is suitable for systems containing multiple UI pages, icons, fonts, and graphical elements.

For compact equipment requiring a high-brightness display, this Sunlight Readable LCD Screen allows the host MCU to communicate with the display through a serial interface while reducing the amount of display-resource processing required by the main controller.

Engineering Technical Q&A

Q1: What is the purpose of the 128M-bit resource storage and USB update function?

The module provides 128M-bit resource storage and supports USB-based resource updates. For equipment containing icons, fonts, images, and multi-page UI content, these resources can be stored within the display module rather than being fully managed by the host MCU.

This architecture can reduce the storage and processing requirements of the main controller. It can also simplify UI maintenance during product development, especially when display resources need to be updated without modifying the core control program.

For a Sunlight Readable LCD Screen integrated into an embedded controller, this approach can be useful when the display interface contains a relatively large number of graphical resources.

Q2: How does the 1500 cd/m² high-brightness design affect power supply and thermal design?

The module has a typical LCM brightness of 1500 cd/m², operates from +5.0V ±0.3V, and has a specified current of 500mA. When designing the host power supply, engineers should ensure that the 5V rail remains stable under the display’s operating load and provides sufficient current margin for the LCD backlight and other system components.

For enclosed equipment, thermal design should also consider continuous operating time, ambient temperature, internal heat sources, and enclosure heat dissipation. A Sunlight Readable LCD Screen with high-brightness backlighting should not be evaluated only by its nominal display current; the complete system operating conditions should be considered when determining power and thermal margins.