Increase the monitor brightness using the monitor’s physical buttons or on-screen display menu
Turn off any auto-brightness or eco mode settings
Set the display mode to a brighter preset, such as Standard or Vivid
Increase contrast if needed
Disable night light, blue light filter, or low blue light mode
Check your computer’s display settings and raise brightness there
Update your graphics driver
Make sure power-saving mode is turned off
Clean the monitor screen
Increase room lighting if the screen only seems dim because of ambient light
Replace the monitor if the backlight is failing