LED Calibration: How to Ensure LED Display Consistency

LED displays are popular for their excellent image quality and accurate color reproduction that stays true to the original content. With individual LEDs having adjustable brightness levels, LED displays can produce deep blacks and bright whites by combining their varying intensities. This allows for consistent image reproduction without losing the quality of the original content.

LED displays come pre-calibrated with the standard brightness and color intensity already set. However, different applications call for different settings, especially considering the installation location. This is why LED displays must be re-calibrated on-site to ensure optimal settings.

Why LED Screen Calibration is Important

LED panels need to be calibrated in order to guarantee that each LED module has the same brightness and color. LED screens that have been calibrated correctly provide high-quality images, ensuring that your content appears as intended. When an LED screen is not properly calibrated, it may show signs of dull colors or inconsistent brightness in some parts of the display. This may affect how viewers consume your content.

Types of LED Calibration

To comply with industry standards, LED screen manufacturers typically calibrate their screens prior to delivery. Since LED displays are made up of multiple modules that can be individually controlled, they must have matching settings to ensure cohesiveness.

Brightness Calibration

LED display manufacturers perform brightness calibration or screen uniformity checks before delivery. This ensures all the LED modules that make up the display have similar brightness and color reproduction quality. This avoids any noticeable disconnect across the display, creating a seamless experience for the viewers.

The process of brightness calibration involves determining the proper brightness level for every LED module. The brightest calibration of your screen should be based on the least bright module. For instance, if one LED module registers a brightness of 1,300 nits (nits refers to the intensity of visible light) and the other is at 1,200 nits, the module with the higher brightness will be adjusted to match the module with the lower brightness.

While it’s common among LED modules to have a 10-20% difference in brightness out of the box, this shouldn’t be visible to the naked eye. This will increase as your display ages. Additionally, factors like heat or direct sunlight contribute to how much your display’s brightness depreciates.

LED displays in indoor locations require a relatively low brightness level, which could be good for their longevity. Because less stress is put on the modules, they aren’t overworked and can optimize their brightness levels. LED modules across one big display don’t depreciate in one go and rearranging them could help in slowing down aging.

Color Calibration

Chroma correction is rooted in the principle of color compensation to ensure uniformity and consistency, which is more complex to execute than brightness correction. For instance, if a pixel’s green appears overly intense, we can slightly illuminate the red and blue components a bit (the exact amount varies depending on how the image is captured, recognized, calculated, and processed during playback). This adjustment reduces the green’s intensity, thereby achieving color consistency.

A normal-sized LED display is typically made of around 28 panels, depending on the module size you choose. The entire screen could have anywhere between 580,000 to a million pixels, depending on the pixel density of your chosen module. Every pixel has red, green, and blue LEDs, which means that there are at least 580,000 of each color in total.

Not all LEDs have the same color accuracy (5nm variance), so the display compensates by mixing the three colors in varying intensities. Color mixing is the process of taking “a bit” of color and adding it to another to make them similar. This is hardly noticeable by the naked eye, but has a great effect on the screen by reducing the color gamut or the total amount of colors available. The more LEDs are not working properly, the fewer color combinations the screen could make.

Benefits of Calibrating LED Screens

  1. A more detailed image quality is possible with LED screen calibration. This is crucial for contents that rely heavily on details, such as medical imaging.
  2. With a well-calibrated screen, there is little stress to the backlights as they wouldn’t have to exert extra support to balance the colors of the LED display.
  3. Backlights working at normal levels mean less energy consumption.
  4. Without the added stress on backlights, the lifespan of the LED display will be longer.

Testing the Image Calibration of Your LED Screen

While most LED screens have been calibrated before delivery, you must still test the image quality on-site to ensure the color and brightness levels are suited to the installation location. Outdoor LED screens would require higher brightness than indoor ones.

To measure the quality of LED display calibration, the test image can be displayed directly on the screen. On your source PC, open a greyscale gradient and observe how the LED screen receives and displays the image. A poorly calibrated LED screen will show a noticeable variation in tones and bands of color. Perform this simple test monthly to ensure your display is working properly.

However, in doing this calibration, keep in mind that your source PC is also prone to poor color reproduction. This makes calibration impossible, especially if your display is old and has decreased brightness levels.

LED display calibration operation

Calibrating LED screens requires a special tool called a colorimeter. This LED calibration tool works with computer software like the NovaStar LED Calibration system.

If you need to calibrate an LED display, a colorimeter tool is essential. The computer program receives these observations, evaluates the data, and finds variations in brightness or color throughout the display.

Adjust the LED screen based on diagnostics, calibrating brightness levels, color gamut, and temperature. Perform all settings on the hardware to ensure consistent image reproduction.

LED calibration software download

NovaCLB-screen setup V6.0

NovaCLB-Cabinet

LED calibration manual download

Quick Start Guide

User Manual

Update Description

CabSolver Quick Start User Manual

 

Conclusion

LED calibration is important in maintaining the consistency and accuracy of your display. Color accuracy is crucial for effective content, as even one misrepresented color can affect the perception of an image. Similarly, the consistency of brightness levels across the display affects image depth, which is crucial for content that relies on lifelike reproduction.

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