Prevent Screen Sleeping

I am going to be using Angstrom Beaglebone Black with an LCD cape. Is there any way to prevent the screen from sleeping and does that differ from HDMI sleep?

Try adding consoleblank=0 as kernel boot parameter.

You might also want to take a look at
# setterm -blank 0
# setterm -powersave off

xset -dpms; xset s off