Why is my phome working but screen not?

I dropped my iphone today and now the screen stays completely black and will not let me do anything, I tried calling my phone to see if it would not turn on or if it was still on and it was still on and I was sliding my finger on the screen numerous times and in different locations and it would not let me answer. I went to put my phone into recovery mode and backup all my things but it will not let me unless I unlock my phone and I cant do that and I don't know what to do, ive tried holding down the power button and then turning it back on and it did so but the screen still does not work and I tried pressing the power and home button at the same time numerous times and nothing will work and I really need my phone to work