can you tell us what you were doing prior to the black screen? Is the phone hot? is your phone damaged in anyway (software - memory at full capacity, outdated firmware, hardware - dropped it, used a really really off brand charger that messed up the motherboard)
If you want to fix it at home, I would first plug it in your computer and check on itunes to see if your computer recognizes your device. If so, back it up and do a factory reset or restore it to a previous time when your phone was working.
if neither of these work, open up your phone and check the screen digitizer circuits and your battery. what do i mean by battery? you could have a faulty battery (therefore it’s swollen and beginning to press up against the motherboard, causing issues)