Acer R221QB User Manual - Page 26

VRB is enabled when Input Timing = 75Hz. If Input Timing <75Hz, VRB

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Page 26 highlights

VRB: When VRB is set to Normal or Extreme, the dynamic picture fine lines will become more clearly, but the brightness will be reduced, and default will be "Off". VRB Setting VRB and FreeSync cannot be enabled at the same time. If FreeSync turned on, then VRB will be "Off". When VRB is "On", Brightness, Blue Light and ACM cannot be adjusted unless it is "Off". VRB is enabled when Input Timing = 75Hz. If Input Timing

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VRB: When VRB is set to Normal or Extreme, the dynamic picture fine lines will
become more clearly, but the brightness will be reduced, and default will be "Off".
VRB Setting
VRB and FreeSync cannot be enabled at the same time. If
FreeSync
turned on, then VRB will be "Off".
When VRB is “On”, Brightness, Blue Light and ACM cannot be adjusted
unless it is “Off”.
VRB is enabled when Input Timing = 75Hz. If Input Timing <75Hz, VRB
is grayed out and disabled.