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LMG7421PLBC KOE 5.1 inch 240×128 lcd display screens
LMG7421PLBC is a classic 5.1-inch monochrome STN-LCD liquid crystal module originally developed and manufactured by Hitachi Ltd., later produced by KOE (JDI Group). Based on the official industrial specification (released in 2002), this panel features a 17:9 wide aspect ratio, 50 PPI pixel density, and blue mode negative transmissive display, delivering stable text and graphic performance for industrial applications.
It adopts STN (Super Twisted Nematic) technology, providing 40°/40°/40°/40° viewing angles (CR≥2). The panel uses a single CCFL backlight system without integrated driver, offering a typical brightness of 150 cd/m² and a lifespan of 10,000 hours. With a compact design of 159.4×101×11.0 mm and parallel 8-bit data interface, it is widely used as a replacement panel for older industrial control systems and medical equipment.
LMG7421PLBC KOE lcd display screens Highlights:
Classic Industrial Design: Proven reliability with over 20 years of field use in industrial environments
Hitachi Original Quality: Stable performance and consistent quality from Hitachi's manufacturing process
Monochrome Blue Mode: High contrast text display ideal for industrial control interfaces
Standard Parallel Interface: Widely compatible with most older industrial control boards
Compact Form Factor: Small size perfect for space-constrained embedded systems
Available Replacement Stock: Limited but stable stock for urgent legacy equipment replacement
Low Power Consumption: 5.0V low voltage supply, energy-efficient for long-term operation
LMG7421PLBC KOE lcd display screens Specification:
| Parameter | Specification |
|---|---|
| Panel Brand | Hitachi (KOE/JDI Group) |
| Panel Model | LMG7421PLBC |
| Alternative Names | LMG742LPLBC, 1MG7421P1BC |
| Panel Size | 5.1 inches (diagonal) |
| Panel Type | STN-LCD, Liquid Crystal Module (LCM) |
| Technology | STN (Super Twisted Nematic), Blue Mode, Negative, Transmissive |
| Resolution | 240 × 128 (Monochrome) |
| Pixel Density | 50 PPI |
| Pixel Pitch | 0.50 × 0.50 mm (H×V) |
| Pixel Format | Rectangle |
| Aspect Ratio | 17:9 (W:H) |
| Active Area | 119.97 (W) × 63.97 (H) mm |
| Bezel Opening | 124.0 (W) × 70.0 (H) mm |
| Outline Dimensions | 159.4 (W) × 101.0 (H) × 11.0 (D) mm (Max) |
| Mounting | Face mounting holes (4-Φ3.0) |
| Brightness | 150 cd/m² (Typical) |
| Contrast Ratio | 20:1 (Typical) |
| Viewing Angle | 40°(L)/40°(R)/40°(U)/40°(D) (Typical, CR≥2) |
| Display Colors | Monochrome (Blue/White) |
| Response Time | 200 ms (Typical) |
| Refresh Rate | 60 Hz |
| Backlight Type | Single CCFL Tube, Without Driver |
| Backlight Lifespan | 10,000 hours (Typical) |
| Interface | Parallel Data (8-bit), CPU Interface |
| Supply Voltage | 5.0V (Typical) |
| Operating Temperature | -10 ~ 60 °C |
| Storage Temperature | -20 ~ 70 °C |
| Weight | 0.3 kg (Typical) |
| Touch Screen | Not Integrated |
| Production Status | Discontinued |
| Stock Quantity | 126+ pieces (as of May 2026) |
FAQ:
Q1: Is LMG7421PLBC still in production?
A1: No, Hitachi discontinued the production of LMG7421PLBC many years ago. However, we maintain a limited stock of original new and tested used panels for replacement purposes.
Q2: What is the difference between LMG7421PLBC and LMG7420PLFC?
A2: The main difference is the display mode. LMG7421PLBC uses blue mode negative display, while LMG7420PLFC uses green mode positive display. Both panels have the same resolution, interface and mechanical dimensions.
Q3: Is LMG7421PLBC compatible with my industrial system?
A3: LMG7421PLBC uses a standard parallel 8-bit CPU interface. Please check your system's original panel model and interface type before purchasing. It is compatible with systems that originally used LMG7421PLBC or its alternative names.
