Optrex DMF-50840NB-FW: A Deep Dive into this 5.7" Monochrome STN Display
Content last revised on October 20, 2025.
Introduction to the DMF-50840NB-FW
The Optrex DMF-50840NB-FW is a 5.7-inch STN monochrome LCD module engineered for clear, reliable data visualization in industrial equipment. Delivering a QVGA 320x240 resolution with a CCFL backlight, this display prioritizes readability and straightforward integration for legacy and new system designs. Its key benefits include robust construction and consistent performance within its specified operating range. This module directly addresses the need for a durable, no-frills human-machine interface (HMI) solution where essential data presentation is the primary requirement. For systems requiring a compact, high-clarity monochrome display for operator terminals or instrumentation, the DMF-50840NB-FW offers a proven and effective solution.
Application Scenarios & Value
System-Level Benefits in Industrial Control and Instrumentation
The Optrex DMF-50840NB-FW is optimally suited for integration into environments where straightforward data legibility is paramount. Its 5.7-inch diagonal size and 320x240 QVGA resolution provide a sufficient viewing area and pixel density for displaying critical operational parameters, system status menus, and simple graphical information. A key engineering challenge in designing interfaces for machinery like CNC controllers, process automation terminals, or medical monitoring devices is ensuring information can be quickly assimilated by the operator. The DMF-50840NB-FW's "Blue Mode" negative STN display is designed for high-contrast character and graphic rendering, making it a valuable asset in these applications. The use of a proven CCFL backlight system ensures stable, long-term illumination, a critical factor for equipment expected to have a long service life.
Key Parameter Overview
Decoding the Specs for System Integration
The specifications of the DMF-50840NB-FW are tailored for embedded industrial applications. The 4-bit parallel data interface is a classic, widely supported standard, simplifying the driver development and integration process with a broad range of microcontrollers. The typical luminance of 60 cd/m² is suitable for indoor industrial environments, providing clear visibility without excessive power consumption. Understanding these parameters is key to leveraging the display's core strengths in your design.
| Feature | Specification |
|---|---|
| Display Technology | STN (Super-Twisted Nematic), Blue Mode Negative, Transmissive |
| Screen Size | 5.7 inches (diagonal) |
| Resolution | 320 x 240 pixels (QVGA) |
| Active Area | 115.2(H) × 86.4(V) mm |
| Outline Dimensions | 167.1(H) × 109(V) mm |
| Pixel Pitch | 0.36(H) x 0.36(V) mm |
| Luminance | 60 cd/m² (Typical) |
| Contrast Ratio | 5:1 (Typical) |
| Interface | Parallel Data (4-bit) |
| Backlight | CCFL (Cold Cathode Fluorescent Lamp) |
| Operating Temperature | 0°C to +50°C |
| Storage Temperature | -20°C to +60°C |
| Weight | 230g (Maximum) |
Download the DMF-50840NB-FW datasheet for detailed specifications and performance curves.
Technical Deep Dive
Design Considerations for Longevity and Performance
The choice of STN technology and a CCFL backlight in the DMF-50840NB-FW reflects a design philosophy centered on stability and proven performance in industrial settings. STN displays are known for their cost-effectiveness and low power consumption for displaying static or slow-moving information. The CCFL backlight, while a more traditional technology, offers an average lifetime of around 20,000 hours, which is a significant consideration for equipment with long operational lifecycles. This predictable lifespan allows engineers to schedule preventive maintenance or component replacement effectively, minimizing unexpected downtime. Think of the CCFL's lifespan rating like the treadwear rating on a tire; it provides a reliable estimate for its operational endurance under typical conditions, which is crucial for calculating the total cost of ownership for an industrial machine.
Frequently Asked Questions (FAQ)
What is the primary benefit of the STN "Blue Mode" display?
The primary benefit is high contrast. The "Blue Mode" negative display provides light characters on a dark blue background, a combination that is easy to read in typical indoor lighting conditions and reduces operator eye strain during extended use.
Is an external inverter required for the CCFL backlight?
Yes, the datasheet indicates the module contains an integral CCFL backlight system but requires an external inverter or driver to power the lamp. The technical documentation provides recommendations for compatible inverters.
What does the 4-bit parallel interface imply for my design?
A 4-bit parallel interface means the display controller needs fewer I/O pins compared to an 8-bit interface, which can be advantageous when using microcontrollers with limited pin counts. This interface is well-suited for displaying text and basic graphics where ultra-high-speed data transfer is not a critical requirement.
Your Next Steps
For procurement inquiries or to request further technical documentation on the Optrex DMF-50840NB-FW, please contact our sales engineering team. We can provide the necessary information to help you qualify this component for your industrial application, ensuring it meets the specific demands of your system's lifecycle and operational environment.
