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The key characteristics of a LCD monitor such as chromaticity, brightnessand tone response are constantly fluctuating due to influences from ambient temperature and/or backlight settings which cause temperature changes inside the monitor.

The ColorEdge series incorporates a display stabilization function to minimize these fluctuations, increasing the stability and accuracy of color presentation by correcting unwanted changes on key display characteristics in real time. This Chapter will explain the working principle and the actual performance of the EIZO display stabilization function.

Firstly, the EIZO display stabilization function is composed of three main components:

• Precise temperature sensing inside the LCD monitor
• Accurate assessment of temperature surrounding LCD panel module with unique estimation algorithm
• Real-time feedback loop and adaptive LCD panel control of key image quality parameters

Thanks to this temperature sensing and estimation technology, precise feedback and compensation is performed with high precision in real time to the key elements of image quality – tone characteristics, screen uniformity, and chromaticity/brightness output. This ensures tone and color reproduction are always accurately maintained within the ideal targets which are originally defined at factory.

Explained in the following sections, we tested the performance of the display stabilization function under various temperature conditions also with different brightness settings which resulted in effectiveness for both tone characteristics (gamma) and chromaticity/brightness.

Fig.11 and Fig.12 compare the tone characteristic fluctuations under various temperature conditions/brightness settings with and without display stabilization. In these graphs, tone curve characteristics in each temperature condition/brightness setting are presented as a different color line. Ideally, when tone curve characteristics would have no fluctuation, the lines would be right on the horizontal axis at gamma 2.4.

Fig.11 shows the Gamma curve deviation without display stabilization, under the influence of temperature change, the gamma fluctuates more than ± 0.1 from 2.4 in the mid to high tone area. In contrast, with the display stabilization function (Fig.12), the gamma deviation is within the variation of ± 0.05 – this shows that the display stabilization function works effectively to maintain accurate tone characteristics, countering changes caused by temperature fluctuations.

Color and brightness correction

As shown in Table 2, without the display stabilization function, when the ambient temperature changes from 25°C to 15°C, there is a variation of ΔE2000＝2.0 compared to 25°C. When the ambient temperature increases from 25°C to 35°C, there is a variation of ΔE2000 =1.9. In contrast, with the display stabilization function, the variation is minimized to ΔE2000=0.2 at 15°C and 0.4 at 35°C (10 degrees decrease/increase), which shows that the display stabilization function works effectively to maintain chromaticity/brightness stable, countering changes cause by ambient temperature fluctuations.

Table 2 Changes in Chromaticity and Brightness (ΔE2000, benchmark: 25°C)

Display stabilization function enhanced by artificial intelligence (AI)

In order to enhance the performance of the display stabilization function described in Chapter 4, a new algorithm powered by AI is implemented in our latest ColorEdge series (June 2018: CG3145, CG319X). Using a temperature-controlled test room and highly accurate measuring devices, data sets comprised of patterns of subtle changes in the LCD monitor caused by temperature fluctuations are collected and used to train (deep learning techniques) and optimize the AI. This enables the creation of a highly precise ambient temperature estimation algorithm. By utilizing this AI-powered temperature estimation algorithm, the ColorEdge series achieves remarkable advances in display image quality stabilization.