Canon eos rebel T2i - Manual (Page 146)

Handy Features
146
This prevents the display-off sensor from turning off the shooting
settings display automatically when your eye nears the viewfinder
eyepiece.
Select [LCD auto off].
Under the [5] tab, select [LCD auto
off], then press <0>. Select
[Disable], then press <0>.
You can change the background color of the shooting settings screen.
Select [Screen color].
Under the [5] tab, select [Screen
color], then press <0>.
Select the desired color, then press
<0>.
When you exit the menu, the selected
color will be displayed for the
shooting settings screen.
3 Preventing the LCD Monitor from Turning off Automatically
3 Changing the Shooting Settings Screen Color
COP
Y