Remote Work & Learning
Interactive Display | Signage
This is normal behavior with dynamic backlighting.
You can go to OSD Menu > System > Advanced > Backlight Control and turn off this function as desired.
For PD3420Q, PD2725U:
You can go to OSD Menu > Picture > Advanced > Dynamic Contrast and turn off this function as desired.
Note: this function is only available when the monitor is connected to a source that has HDR enabled.
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