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The Correction Process

VisionTUNE™ was developed by Radiant Imaging to enable on-site brightness and color correction of an LED display down to individual LED pixels.

This involves measuring the performance of each individual LED on the screen and adjusting the way input video and images are displayed to precisely compensate for LED-to-LED variations. The key steps are:

1 Preparation.

First, any required physical maintenance (e.g., tile replacements or cleaning) should be completed.

2 Set-up.

An appropriate line of sight for performance measurement needs to be determined (what is the primary viewing location for the display?). Access to power and screen control needs to be set up.

3 Measurement.

An imaging colorimeter—a calibrated scientific instrument that can precisely measure color and luminance the way the human eye sees them—is used to obtain accurate measurement of the color and brightness of each individual LED in the display.

4 Computation.

Now that the real quantitative performance of the screen is known, individual adjustments are computed for every LED pixel in the screen to:

• Match a user-selected color gamut
• Produce uniform color across the screen
• Produce uniform luminance across the screen

5 Application.

The correction coefficients (or pixel-level remapping) can now either be loaded onto the LED display hardware if correction is supported internally, or onto VisionLINK™, an external correction processor developed by Radiant Imaging that corrects the video input in real-time.

6 Verification.

The adjusted screen is measured again, and a final tile level adjustment may be performed. The final corrected screen is measured to document the screen's new performance.

7 Spares.

Some spare tiles are usually measured and corrected as well. These can later be installed in the display with minimum disruption to overall display appearance.

8 Maintenance.

Keeping the LED screen looking its best requires:

• Regular physical maintenance
• Adjusting replacement tiles to exactly match the display in brightness and color. VisionMATCH™ is an easy-to-use tool for doing this accurately
• Another VisionTUNE screen correction when color, sharpness, and uniformity deteriorate—this can be in 1 to 3 years depending on usage and environment