LG UltraGear GR93U-B Series Owner's Manual page 26

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Variable Backlight
Picture Adjust
DFC
Picture Reset
Provides extended contrast and gradation on a dark screen depending on game or video content.
Faster Preferably for PC gaming experiences.
Fast Preferably for console gaming experiences.
Normal
Preferably for playing video content and internet or word-processing.
Off Disables the Variable Backlight feature.
NOTE
• When these feature is enabled, a slight halo effect may be shown on dark backgrounds. This is normal and not a malfunction.
• When these feature is enabled, the screen flickering may occur intermittently.
• The function can only be used on HDR content.
• It is recommended to turn off when you are not using the gaming function.
Adjusts the brightness automatically according to the screen.
On
Disables the DFC feature.
Off
Do you want to reset your picture settings?
No Cancel the select.
Yes Returns to the default settings.