It would be nice if apps had a prevent lock so I wouldn't have to change my settings.
Support Our Troops!!
This post was Tapatalk approved. Sent from my Incpad
When it starts to dim, just touch the screen and it will brighten up again.
Your Auto Lock is probably set at a 2 minute duration. The dimming is a precursor to Auto Locking the IPad. If it hasn't been touched during the specified length of time it will dim and then turn off. In Settings>General>Auto Lock change your Auto Lock to a longer duration (10, 15, or never). That should fix your problem.