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—— Andreas Anderssons
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Industrial HMI Display Selection: Why PMOLED?
When designing Human-Machine Interfaces for industrial equipment, medical devices, or automotive systems, engineers face critical decisions in display technology selection. Passive Matrix OLED (PMOLED) displays offer distinct advantages for these applications, particularly when space, reliability, and optical performance are paramount.
The SFTOS042XZ-7110AN: A Technical Overview
The SFTOS042XZ-7110AN from Saef Technology Limited represents the current state-of-the-art in compact PMOLED technology with specifications tailored for demanding environments:
Compact Form Factor: 0.42-inch diagonal with 72×40 pixel resolution
High Brightness: 430 cd/m² typical (with internal DC/DC converter)
Extended Temperature Range: -40°C to +85°C operating temperature
Dual Interface Support: I²C and 4-wire SPI for design flexibility
Brightness Considerations for Industrial Applications
Unlike consumer displays, industrial HMIs often operate under direct sunlight or bright factory lighting. The SFTOS042XZ-7110AN delivers 360-430 cd/m² brightness, ensuring readability in challenging lighting conditions. The CIE coordinates (0.32, 0.35) provide consistent white point across production units.
Thermal Performance in Extreme Environments
Industrial equipment must withstand temperature extremes. This display module maintains functionality from -40°C to +85°C, with reliability verified through:
High/Low Temperature Operation (240 hours each)
Thermal Shock Testing (-40°C ↔ 85°C, 24 cycles)
High Temperature/Humidity Operation (60°C, 90% RH, 120 hours)
Interface Flexibility: I²C vs. 4-Wire SPI
The BS1 pin allows engineers to select between I²C and 4-wire SPI interfaces post-production, providing flexibility for different microcontroller architectures:
// BS1 pin configuration
BS1 = 1; // Select I²C interface
BS1 = 0; // Select 4-wire SPI interface
Conclusion
The SFTOS042XZ-7110AN PMOLED display provides industrial designers with a robust, high-performance solution for space-constrained applications. For detailed technical specifications, download the complete SFTOS042XZ-7110AN DATASHEET.pdf.

