I dropped my iphone 4s and it is completely black. Is it the display?

I can still get it to vibrate when i change it from silent to volume on but no light or screen display. My phone will try to back up but its locked with a passcode. What is wrong with it? Holding the home/power button doesn't work either.

More than likely its the digitizer. Simple fix. Prob get it for fifty bucks. Look on YouTube for instructions

Ya, that is iPhone!