The iPhone or iPad screen defaults to automatically dim itself and then turn itself off after a fairly short amount of time of inactivity. That’s great for preserving battery life of iOS devices, but for reading it may become annoying

Here’s how to prevent the iPad (or iPhone or iPod) screen from dimming and auto-locking:

  1. Open “Settings” then tap “General”
  2. Tap “Auto-Lock” and choose “Never” as the option or choose "15 Minutes"

Close out of Settings, and now when you leave the iPad, iPhone, or iPod touch screen alone it won’t automatically lock itself or even dim.

See picture below: