Hi @bxjfin
Either the display flex cable has been jarred loose or the display has been damaged by the fall.
Here's a [https://www.youtube.com/watch?v=A1Byt4ehiAY|video] that shows how to replace the display assembly in the phone that may help.
You can check if the flex cable is secure and if so it may be necessary to replace the display assembly.
Search online for ''GH97-21898A GH97-21897A'' to find suppliers that suit you best.
If doing this yourself is too daunting, contact a reputable, professional mobile phone repair service and ask for a quote to repair the phone.