会社のニュース Beyond Brightness: How Optical Uniformity in a 2-Inch IPS Display Solves Real-World Readability in Industrial Lighting

When designing HMIs for industrial use—whether a German CNC control pendant or a U.S. field-service analyzer—brightness alone doesn’t guarantee readability. Glare, off-axis viewing, and color shift under fluorescent or sunlight can render even a “400-nit” display useless.

That’s why forward-thinking engineers are shifting focus from peak luminance to optical consistency—and the 2-inch IPS TFT SFTO200JY-7250AN delivers exactly that.

The Myth of “All-Angle” Viewing—and What Really Matters

Many datasheets claim “wide viewing angles,” but without quantifiable contrast data, it’s marketing fluff. This module, however, specifies:

• Typical Contrast Ratio: 800:1 @ normal incidence
• Horizontal/Vertical Viewing Angles: ≥80° (CR > 10)
• Optimal Viewing Direction: ALL (thanks to advanced rubbing alignment)

Unlike cheaper TN panels that invert colors at 30°, this Normally Black IPS panel maintains grayscale stability even when viewed from above a machine console or below a mounted panel—critical in multi-operator environments.

Per research published in SID Digest 2022, IPS technology in sub-2.4" formats now achieves luminance uniformity >85% across the active area—verified here via the module’s 30.60 × 40.80 mm active region and tight pixel pitch (0.1275 mm).

Color Fidelity You Can Trust

Industrial diagnostics, status indicators, and safety alerts rely on accurate color rendering. The SFTO200JY-7250AN supports 262K colors with tightly controlled chromaticity:

• White Point: x=0.296 ±0.02, y=0.325 ±0.02
• Red/Green/Blue coordinates within ±0.02 tolerance

This ensures a “red alarm” looks red—not orange—even under cool-white LED shop lighting (CCT 5000K), satisfying ISO 13187 ergonomic guidelines for control room displays.

Integrating Touch Without Sacrificing Optics

Adding a touch layer often degrades brightness and adds haze. But Saef Technology Limited’s optical-grade bonding process for CTP/RTP overlays minimizes reflectance loss, preserving the 400 cd/m² surface brightness. Custom anti-glare (AG) or anti-reflective (AR) coatings are also available for outdoor kiosks or sunlit warehouses.

Why U.S. & German Engineers Should Care

In Germany, DIN EN 61310 mandates clear, unambiguous status indication in machinery. In the U.S., OSHA and ANSI B11.19 require legible controls under all expected lighting. A display that performs consistently—not just brightly—is non-negotiable.

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