Description
Product Introduction of Transmissive LCD
This 2.4-inch TFT LCD display module (model: TFT-H024A5QVIST8R18) from HOTHMI is based on advanced Transmissive LCD technology and Normally Black display technology. It features Free O’Clock full viewing angles, delivering high-end visual performance that maintains color accuracy from various angles. The screen resolution is 240×3RGB×320, and it integrates the industry-proven, highly stable, low-power ST7789V driver IC, using an efficient pin-saving SPI-4L (4-wire serial) communication interface.
In terms of core parameters, the main power supply voltage VCI is 2.8V, the interface level IOVCC is 1.8V, and the backlight system uses white LEDs. Under typical operating conditions of Vf=3.2V and current If=100mA, it achieves a brightness of up to 800 cd/m², making it ideal for direct-sunlight outdoor equipment and handheld industrial terminals. The mechanical design is precise, with overall dimensions of 42.52mm × 59.86mm and a total thickness of only 3.40±0.3mm. The active display area is 36.72mm × 48.96mm. Through 18 pins, the module provides complete signal lines including SPI control, power, backlight, and RTP touch (XL/XR/YU/YD), facilitating slim device integration.
Additionally, this Transmissive LCD module demonstrates excellent industrial-grade environmental adaptability, with an operating temperature range of -20°C to +70°C and a storage temperature range of -30°C to +80°C, ensuring stable and continuous image output under various harsh and changing conditions.
Core Technical Highlights: Why Choose a Transmissive LCD?
The key feature of this display module is its Transmissive LCD technology. Unlike reflective or transflective screens, the physical structure of a transmissive screen relies entirely on the backlight system behind the screen to pass light through the liquid crystal panel to produce images.
- 800 cd/m² high brightness and direct sunlight readability: Thanks to the efficient Transmissive LCD architecture, this panel achieves typical brightness of 800 cd/m². Under strong outdoor sunlight, ordinary low-brightness displays often wash out or become unreadable due to glare. In contrast, this module ensures clear, high-definition color readability in all lighting conditions.
- Free O’Clock full viewing angle technology: This Transmissive LCD module supports Free O’Clock 80-degree viewing angles in all directions, maintaining color accuracy and preventing color shift even from extreme angles.
- Industrial-grade wide-temperature operation: The module fully meets industrial environmental requirements, with an operating temperature range of -20°C to +70°C and a storage temperature range of -30°C to +80°C. It can withstand both severe winter cold outdoors and high heat buildup inside enclosed industrial enclosures in hot climates.
Transmissive LCD Pin Function Description
The module connects to the main board via an 18-pin FPC flexible flat cable with a pin pitch of 0.8mm and a total width of 13.60mm. Below are the specific physical functions and electrical signal definitions for each pin.
Typical Industry Applications of Transmissive LCD
Thanks to the excellent backlight penetration and environmental tolerance of this Transmissive LCD panel, it has been widely deployed in the following professional devices:
- Outdoor new energy smart hardware: EV charging station display panels, smart two-wheel electric vehicle connected dashboards, outdoor portable power station displays.
- Industrial human-machine interface terminals: Injection molding machine control panels, automated production line PLC displays, data center environmental monitoring handheld terminals.
- Medical testing instruments: Portable multi-parameter monitors, digital blood oxygen/blood pressure analyzers, laboratory smart centrifuge displays.
- Smart home and security control: High-end wall-mounted smart switch control panels, video intercom indoor units, industrial IoT gateways.
Transmissive LCD Technical Q&A
Q1: Can this screen be read directly under strong sunlight during the day?
A1: Yes, absolutely. This is the core advantage of a Transmissive LCD combined with a high-brightness backlight. This screen offers typical surface brightness of 800 cd/m², far exceeding the 300-nit standard of ordinary electronic devices. With its high contrast ratio and full viewing angle technology, light can powerfully penetrate the liquid crystal layer, ensuring clear text and recognizable icons under direct outdoor sunlight.
Q2: The VCI power input is 2.8V. If the main MCU runs at 3.3V, does the SPI bus need a level shifter?
A2: In most cases, no. The ST7789V driver IC has some voltage tolerance on its digital I/O interface. When VCI is supplied at 2.8V, a 3.3V high-level control signal will not damage the chip under normal noise margin limits. However, to ensure the MCU’s pin output does not generate severe overshoot transient voltages, for the most robust industrial reliability, a 47Ω current-limiting resistor can be added in series on the SPI signal lines.
