General :: Screen Slowly Enveloped With (blue Ink)

I dropped my phone that created a crack (a new crack stemming from an older one which gave me no problems) which lead to me not being able to use the very bottom of my screen (really just the space bar area). The crack was slightly above said area. Then this "blue ink" smudge began forming and took over the bottom 1/4 inch of the screen. When I woke up the next morning, the only portion of the screen still visible was the middle third, as the top and bottom were now dark blue. By the end of my shift that morning, the screen was completely black. I have heard a screen replacement may be all I need, but I am worried that the digitizer (I hope I'm using the right terminology, referring to the touch screen capability of the phone) may have been damaged as again I could not use the bottom part of my screen.