Black screen after startup until home pressed - is this normal?

Hi there,
I've just got a new ipad and have a question please. After I turn it on it very briefly shows the swipe to unlock screen (about 2 seconds) then goes to a black screen. If I press the home button it comes back again for about 5 seconds before going black again unless I swipe and then it works fine. Is this normal behaviour please? I can't find anything to describe this as normal or in the settings to change it.
Thanks for your help!
Mike

Yes, it is normal.  The screen goes right back to power saving sleep mode if you do not swipe to unlock it.  The assumption being, if you do not swipe to unlock, you are not using it so why waste power lighting up the screen.
If you go to settings->general->auto-lock and set it to "never" then once you swipe to unlock the screen will remain lit and active until you manually press the hardware sleep button (or use a magnetic closure, like the Apple smart cover or smart case), but that also may waste a lot of power.

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