The colour calibration of LEDS is a process that is carried out to ensure the consistency of colour and brightness in all LED modules or plates on a screen. In the screens for advertising use, uniformity and colour stability are of great importance to offer quality images.
The process of achieving uniformity of different led modules is known as relative calibration, or screen uniformity.
Once the screens are manufactured, good screen manufacturers submit all their screens to calibration processes before being delivered.
In professional applications such as LED screens on television dishes, not only the uniformity of the image is important, but also the real representation of colour, which must be as true as possible to reality. This is known as absolute calibration. This process results in higher costs in the manufacture of screens for this use, so it is only recommended for high-level television or broadcast uses.
The calibration process is performed with special cameras or colorimeters that capture and measure a greater spectrum of light than conventional cameras. These cameras record pre-established image patterns and a computer analyses the readings of the camera in real time to later modify the individual configuration of the components of the LED monitor. This camera system is accompanied by software that interprets the data of the camera and that must be compatible with the LED screen’s internal data cards. This way you can reconfigure the colour and brightness corrections on the display hardware itself.
With the passage of time (years) and the increase of temperatures, the LED ‘s spectral peaks will be reduced; they will spread; and they will alter at different wavelengths. These alterations cause chromaticity changes.
Therefore, the result of LED aging is a lower brightness, a shift of the white balance, and the altered chromaticity of the primary colors and the other intermediate colors.
Carrying out a calibration once the screen is several years old, is based in general terms on a general brightness reduction. That is why the most advisable thing is to acquire screens with quality LEDs, since these effects are less noticeable over the years and, to some extent, you will avoid this type of problems.