Content last revised on November 17, 2025
Hitachi LMG6400PLGR: A Deep Dive into the 5.1-inch Monochrome STN Display for Industrial HMIs
Clarity and Reliability for Demanding Industrial Interfaces
The Hitachi LMG6400PLGR is a 5.1-inch STN (Super-Twisted Nematic) monochrome LCD module engineered for high-clarity data visualization in industrial equipment. Delivering a crisp 240x128 pixel resolution, this reflective display excels in environments where direct, unambiguous readouts are critical for operational efficiency and safety. Its design prioritizes durability and stable performance, addressing the core need for long-life components in human-machine interfaces (HMIs), process controllers, and specialized test equipment. For systems requiring a straightforward, reliable graphical or character display without the complexity of color, the LMG6400PLGR provides a robust and efficient solution. With a typical response time of 250ms (Tr) / 300ms (Td), it is best suited for applications where status indicators, menus, and critical data are the primary content, rather than full-motion video.
Key Parameter Overview
Decoding the Specifications for System Integration
The technical specifications of the LMG6400PLGR are tailored for integration into a wide range of industrial and embedded systems. The following parameters are critical for design engineers to assess its suitability for their specific application.
| Display Characteristics | |
| Manufacturer | Hitachi |
| Model | LMG6400PLGR |
| Screen Size | 5.1 inches |
| Display Type | STN-LCD, Blue/Grey Mode (Positive), Reflective |
| Resolution | 240 x 128 pixels |
| Pixel Pitch | 0.499 x 0.499 mm |
| Active Area | 119.97 x 63.97 mm |
| Contrast Ratio | 3:1 (Typical) |
| Viewing Angle | 40° (Typical, CR≥1.4) |
| Electrical & Interface | |
| Signal Interface | 8-bit Parallel Data (20 pins) |
| Supply Voltage (VDD) | 5.0V (Typical) |
| Backlight | None |
| Mechanical & Environmental | |
| Outline Dimensions | 159.4 x 101 x 11.0 mm |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Vibration Resistance | 2.0G (19.6 m/s²) |
Download the LMG6400PLGR datasheet for detailed specifications and performance curves.
Application Scenarios & Value
System-Level Benefits in Control and Instrumentation
The LMG6400PLGR is engineered for applications where information density, readability, and operational robustness are paramount. Its reflective nature, which utilizes ambient light to illuminate the display, makes it an inherently power-efficient choice for portable or power-constrained devices. What is the primary benefit of its reflective design? It eliminates the need for a backlight, significantly reducing power consumption and heat generation.
A high-fidelity engineering scenario for this display is in a portable environmental monitoring device. In this context, an engineer's challenge is to maximize battery life while ensuring the screen is readable under varied, often bright, outdoor lighting. The LMG6400PLGR's reflective STN technology directly addresses this. Unlike backlit displays that wash out in direct sunlight, its contrast can improve, ensuring critical data like gas concentration levels or temperature readings remain legible. The 8-bit parallel interface simplifies the connection to common microcontrollers used in such embedded systems, reducing design complexity and time-to-market. For similar industrial applications that may require a built-in backlight for low-light conditions, the LMG6912RPFC offers an alternative with integrated CCFL backlighting.
Frequently Asked Questions (FAQ)
What is the key advantage of the STN (Super-Twisted Nematic) technology in the LMG6400PLGR for industrial use?
STN technology provides excellent contrast for monochrome text and graphics, making it highly effective for the clear and unambiguous display of data, which is often a priority in industrial user interfaces over color fidelity. It represents a mature, reliable, and cost-effective technology for these applications.
How does the lack of a backlight impact the application scope of this display?
The absence of a backlight makes the LMG6400PLGR exceptionally power-efficient and suitable for well-lit indoor environments or outdoor applications with sufficient ambient light. It is ideal for handheld diagnostic tools, utility meters, and other systems where battery life is a critical design constraint. However, it is not suitable for use in dark or dimly lit conditions without an external front light source.
Engineering-Centric Guidance
For engineering teams designing HMIs for industrial machinery, test and measurement equipment, or portable diagnostic tools, the Hitachi LMG6400PLGR offers a compelling combination of clarity, low power consumption, and proven reliability. Its straightforward parallel interface and robust mechanical design facilitate seamless integration into systems where clear data presentation is the primary function. To ensure this component meets the specific demands of your application, we encourage a thorough review of the official datasheet and a discussion with our technical specialists regarding your system's unique operational and environmental requirements.