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To read about our monitor tests in-depth, please check out Display Testing Explained: How We Test PC Monitors. We cover brightness and contrast testing on page two.
Uncalibrated – Maximum Backlight Level
To see the 34WQHD240-C’s maximum output, the Brightness Stabilizer must be turned off. That will brighten up highlight areas of the image. It also means I must use 25% window patterns to determine peak luminance. It’s over 462 nits here which is typical of the category. If you want constant brightness, turn the stabilizer on and the peak will be around 260 nits. Black levels do not change so contrast in either case cannot be measured.
After Calibration to 200 nits
I adjusted the 25% window to 200 nits, corresponding to a slider value of 43. If you turn Brightness Stabilizer on, 200 nits comes at 83. As before, black levels and contrast are unaffected. You’re only adjusting peak luminance here. The ANSI test exhibits the same behavior. The black squares emit no light so intra-image contrast is unmeasurable.
Test Takeaway: The 34WQHD240-C exhibits the same true blacks and unmeasurable contrast as any OLED monitor. In these tests, there is no appreciable difference between products. You can choose between constant or variable brightness, and I recommend variable (Brightness Stabilizer Off) for the most impactful highlights.
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