Ensuring Consistency and Color Accuracy with Point-by-Point Calibration in LED Displays

One of the biggest challenges in LED display technology is color and brightness uniformity. Even the most advanced fine-pitch LED screens can suffer from uneven brightness or color shifts over time. This results in what the industry calls a “flower screen” effect—where patches of different brightness or tint disrupt the image quality.

At Ebani Tech, through Digitopia™ Smart Screens, we apply point-by-point calibration to eliminate these inconsistencies and deliver professional-grade visual experiences for brands, malls, and high-impact environments.

Why LED Displays Require Calibration

No two LEDs in the world are perfectly identical. Small differences in materials, packaging, and assembly create natural variation in:

• Brightness levels
• Current response in driver chips
• Optical axis alignment
• Bonding angles and soldering quality
• Module flatness and assembly tolerance
• Heat distribution across the screen
• Long-term light decay of individual LEDs

All of these differences accumulate and create visible inconsistencies. Without calibration, even premium LED screens will eventually lose colour fidelity and uniform brightness.

What is Point-by-Point Calibration?

Point-by-point calibration is a precision process that measures and adjusts the brightness and chromaticity of each pixel (or even each sub-pixel).

Here’s how it works:

• A spectrometer scans the display pixel by pixel.
• The system collects raw brightness and color data for each red, green, and blue sub-pixel.
• Correction coefficients are calculated and fed into the control system.
• The control system applies these coefficients, driving each pixel individually to restore uniform brightness and accurate colors.

The result is a screen that displays images as intended: sharp, consistent, and color-true.

Step-by-Step Calibration Process

1. Adjust Basic Parameters First

• Brightness and Contrast: Set brightness to about 1.5–2 times ambient light. For example, if ambient light is 300 lux, adjust the screen to 500–600 cd/㎡. Keep contrast around 80–90%.
• Color Temperature: For broadcast and television, 6500K (cool white) is standard. For conference rooms or exhibitions, 5500–6000K (natural white) creates a more comfortable experience.
• Gamma Curve: Start with 2.2. If the picture is too dark, increase slightly (e.g., 2.4).

2. Perform Pixel-Level Corrections

• Activate calibration software and scan RGB brightness values of each module.
• Identify areas with brightness deviations over 5% (corners, splicing gaps).
• Adjust RGB brightness values in small increments (not more than 3% at a time).
• Compare, recalibrate, and repeat until the screen achieves visual uniformity.

3. Fine-Tune Gamma and Color Temperature

• Import standard Gamma curves such as sRGB and check detail visibility in dark and bright areas. Adjust control points as needed.
• Measure the actual color temperature with a spectrometer. If the screen shows 7000K (too blue), reduce blue channel gain to align closer to 6500K.

Why Point-by-Point Calibration Matters

Point-by-point calibration is especially critical for COB (Chip on Board) LED displays and other high-resolution fine-pitch screens. It ensures:

• Consistent brightness across all pixels
• Accurate chromaticity and natural color reproduction
• Extended screen lifespan by reducing uneven wear
• Improved image quality for high-definition content

For advertisers, broadcasters, and event managers, calibration directly impacts brand visibility, audience engagement, and ROI.

Digitopia’s Approach

At Digitopia™ by Ebani Tech, we integrate point-by-point calibration into our installation and maintenance workflows. Whether it’s a TrimX Digital Salon screen or the 25×12 ft Curved LED at Odeon Mall, India’s First Smart Mall, our goal is to deliver unmatched color accuracy and display consistency.

📞 For professional LED calibration and display optimization, call +91 7799000590 / +91 7799000600
📧 Email: [email protected]

Digitopia™ by Ebani Tech
Delivering true-to-life colors with precision calibration.