128 x 64 Graphic Display FSTN ST7565R

The HTM12864-140-30W-N3P-V01, launched by HOTHMI, is a high-quality monochrome dot-matrix LCD module. As a classic 128 x 64 Graphic Display, this product delivers excellent graphic and text rendering capabilities within a compact structural footprint. It adopts an FSTN positive-display transflective mode, offers a resolution of 128 x 64 pixels, and supports a 6 o’clock (6H) optimal viewing direction, ensuring clear and legible visuals both indoors and under strong outdoor sunlight.

The 128 x 64 Graphic Display module is built around the mature ST7565R controller/driver IC, uses 1/64 duty and 1/9 bias driving schemes, and incorporates two high-brightness white LEDs as backlight. Its logic supply voltage is standard 3.3V (with a wide range from 3.0V to 3.6V), and it flexibly supports 6800 or 8080 series MCU parallel interfaces for data transfer. The external dimensions are compact and refined, measuring just 44.55 x 25.0 x 5.3mm, and the operating temperature ranges from -10°C to +60°C. This makes the module well suited for portable instruments, smart home devices, industrial controls, and various intelligent terminals that require small size, low power consumption, and high-contrast monochrome graphic displays.

Key Technical Highlights of 128 x 64 Graphic Display

This 128 x 64 Graphic Display module stands out among similar products due to the following core technological advantages:

• Excellent outdoor sunlight readability: The FSTN positive-display transflective LCD panel combines the strengths of reflective and transmissive modes. In bright outdoor environments, ambient light reflection allows clear reading without backlight—the stronger the sunlight, the sharper the image. In low-light conditions, turning on the backlight ensures unobstructed readability, effectively overcoming the common drawback of traditional transmissive screens that appear “completely dark” under sunlight.
• Optimized viewing angle and high contrast: The 6 o’clock (6H) best viewing direction, together with the precise 1/64 duty and 1/9 bias drive scheme, delivers extremely high display contrast, sharp character edges, and no motion blur.
• Low power consumption and long-life backlight: The built-in two high-efficiency white LED backlights draw only minimal logic current when off (typical chip operating current below 1mA) and about 30mA when the backlight is on, making this module an ideal choice for battery-powered and other low-power devices.
• Ultra-compact and thin mechanical design: With external dimensions of only 44.55 x 25.0 x 5.3mm, the slim profile frees up valuable internal space in end products, giving hardware engineers greater flexibility in PCB routing and mechanical integration.

Pin Function Description

Target Application Fields of 128 x 64 Graphic Display

Thanks to its powerful graphics rendering capability and ultra-low power consumption, this 128 x 64 Graphic Display LCD module has been widely deployed in the following industry scenarios:

• Industrial automation and measurement instruments: digital power meters, handheld multimeters, environmental gas detectors, and industrial inverter status panels. Its excellent ESD resistance and wide-temperature operation ensure stable all-weather performance in harsh factory environments.
• Smart home and IoT terminals: smart thermostats, wall-hung boiler control panels, water purifier filter status screens, and wireless gateway indicators. The compact footprint allows seamless integration into various elegant wall-mounted panels.
• Portable medical devices: handheld blood glucose meters, portable oximeters, nebulizer control screens, and small-to-medium beauty equipment. The low-voltage operation and high-contrast text display enable patients and medical staff to clearly read critical physiological parameters.
• Smart hardware: small audio menu interfaces and 3D printer control terminals.

Technical Q&A of 128 x 64 Graphic Display

Q1: What is the operating voltage of this 128 x 64 Graphic Display module? Can it be directly connected to a 5V system microcontroller?

A1: The logic operating voltage of this module is nominally 3.3V, with a safe range from 3.0V to 3.6V. If your host system (such as a traditional 5V microcontroller or Arduino UNO) uses a 5V supply, you must not directly connect 5V I/O pins to the module’s data and control lines (e.g., DB0~DB7, A0, /WR, etc.), as this may damage the ST7565R driver chip. It is recommended to insert a level translator (such as 4050, 74LVC245) or use resistor dividers for level matching between the 5V MPU and the 3.3V module.

Q2: What is an FSTN transflective display? What are its advantages over traditional LCDs?

A2: FSTN adds a compensation film to the STN structure, which significantly reduces color shift, improves black-and-white contrast, and widens the viewing angle. Transflective means the LCD substrate can both reflect ambient light and transmit backlight.
Its key advantage lies in full-scenario adaptability: under strong outdoor sunlight, you can turn off the LED backlight entirely and read the screen clearly using only reflected sunlight, achieving “zero backlight power consumption.” In dark environments, turning on the internal white LED backlight turns it into a high-brightness transmissive display. This performance cannot be matched by pure transmissive screens (which suffer from severe reflections in sunlight) or pure reflective screens (which are unreadable at night).