During the daytime the sunlight in a cockpit can be blinding, so it must be possible for the monitor to be adjusted to extreme brightness, otherwise the screen will just be a sheet of white. Indeed, whether it is the black of night or the middle of a lightning storm, all kinds of weather conditions and topography are variables in the use of instruments in flight, and must be carefully considered.
以螢幕顯示器來說，白天飛機上可能陽光刺眼，必須把背景光線調到極亮，螢幕看起來才不會一片空白；至於漆黑的夜晚、劃破長空的閃電，乃至於各種天候及地形變因，在飛行時都會成為使用變數，必須詳加考慮。