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Uncalibrated – Maximum Backlight Level
The Q27G4ZD doesn’t have a variable brightness option. Therefore, it measures the same whether field or window patterns are used. It peaks around 254 nits, which isn’t super bright, but it is bright enough. I would not use it in my sunny office at full honk because it would be fatiguing after a short while. It’s easy to tell which screens have variable brightness. The Aorus and Asus both peak at well over 400 nits. Whatever your preferred light level, blacks are unmeasurable, so contrast is theoretically infinite.
After Calibration to 200 nits
Calibration produces no change in contrast or black levels. Setting the Q27G4ZD is easy because you will see uniform brightness in all content. This holds true for HDR as well; I’ll talk more about that on page five. ANSI contrast is also unmeasurable since the black squares of the checkerboard pattern don’t register on my light meter.
Test Takeaway: The Q27G4ZD’s lack of variable brightness might be an issue for some users, but it doesn’t make a difference in SDR content. There is plenty of light available here and no matter what output level you choose, black levels and contrast are the same as any OLED, theoretically infinite.
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