Product Description
This negative VA white character liquid crystal module is powered by 4.5V and has a 34-pin design. Its core technology is negative vertical alignment (VA) liquid crystal, presenting a negative display effect with a black background and white characters. It is suitable for character display scenarios and features high contrast and wide viewing angle. It is a mature display solution for industrial and civilian equipment.
Product Core Introduction
Display Principle and Effect: In VA mode, the liquid crystal molecules are arranged vertically on the base plate when no electric current is applied. In negative display mode, a black background with white characters is presented. The white characters stand out sharply against the dark background, and they remain clear even under strong light. Usually, a white backlight (such as white LED) is equipped, which can further enhance the recognition ability in low light and readability.
Electrical and Interface Characteristics: The nominal operating voltage is 4.5V, compatible with common equipment power supplies of 3.0-5.5V, with strong compatibility; 34-pin pins provide complete interfaces for power, data, control, backlight, etc., supporting parallel / partial serial driving, compatible with mainstream 8-bit / 4-bit MPU interfaces, and can directly drive character display (such as 8×2, 16×2, 20×4, etc., common character specifications).
Structure and Driving: Mostly in COB/COG packaging, integrating a driving IC (such as the HD44780 compatible series), supporting standard character libraries and custom characters, enabling digital, alphabetic, symbol, and simple icon display; the working temperature is typically -20°C to 70°C, meeting the needs of most industrial and vehicle environments.
Core Advantages: High static contrast (usually ≥ 300:1), clear black and white; wide horizontal/vertical viewing angle (approximately 120°-140°), clear side view; good stability of negative VA liquid crystal, low power consumption, small attenuation over time, and superior anti-interference ability compared to some TN/STN solutions.
Typical Applications
Industrial Control: Used for PLCs, frequency converters, temperature/pressure controllers, flow meters, liquid level meters, etc., for displaying parameters, status codes, alarm information. With a wide viewing angle, it is suitable for observing from multiple angles within the cabinet, and with high contrast, it is compatible with strong or weak light environments in the workshop.
Instrumentation: Multimeters, oscilloscopes, signal generators, power supplies, etc., for displaying measured values, range, and gears. With a black background and white text, it is easy to read. 4.5V low power consumption is suitable for battery-powered scenarios.
Automotive Electronics: Vehicle meters (rpm, fuel level, water temperature), dash cams, tire pressure monitoring systems, navigation assistance displays. With wide temperature and shock-resistant design, it is suitable for vehicle conditions, and with a wide viewing angle, it meets the viewing needs of the driver's seat and the passenger seat.
Medical Equipment: Blood glucose meters, blood pressure monitors, blood oxygen monitors, infusion pumps, etc., for displaying values, operation instructions, and alarm prompts. With high contrast, it reduces reading errors, and with low power consumption, it is suitable for portable/mobile use.
Smart Home and Small Appliances: Ovens, refrigerators, washing machines, air conditioner indoor units, for displaying set temperatures, operating modes, and timing times. With simple character display that meets the UI requirements of household appliances, it is compatible with power fluctuations.
Security and Communication: Access control hosts, alarm hosts, small switches, optical network units, etc., for displaying device IDs, signal strength, and alarm status. Stable and reliable, it is suitable for 24-hour duty scenarios.
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