Dell UltraSharp U3821DW User Manual page 58

DDC/CI DDC/CI (Display Data Channel/Command Interface)
allows you to adjust the monitor settings using
software on your computer. You can disable this
feature by selecting Off.
Enable this feature for best user experience and
optimum performance of your monitor.
LCD Helps reduce minor cases of image retention.
Conditioning Depending on the degree of image retention, the
program may take some time to run. You can enable
this feature by selecting On.
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58 Operating the monitor