Will a screen replacement fix glitching, flickering, unresponsiveness?

I dropped my phone from no more than 1 foot off the ground, but it landed at a terrible angle on some rocks and received a chip in the lower right hand corner + a hairline fracture that extends about an inch across the bottom of the screen.

Since then, the screen will almost constantly flicker and glitch, sometimes spontaneously turning black or shutting off. When it’s doing this, it may respond partially to touch or not at all.

(Although, bizarrely, sometimes I’ll go 10-15 minutes without a single screen glitch, like nothing’s wrong at all. But the problem always returns. And it’s worse when the phone is plugged in to charge, which makes no sense to me.)

• I had no problems with responsiveness before the drop.
• No water damage.
• The phone was purchased refurbished, so I can’t be 100% certain it’s the original screen, but it seems to be. (It’s definitely OLED, at least)
• The phone is not under Apple warranty or any kind of damage warranty.
• I’ve already tried all the easy fixes: soft restart, hard restart, take off the case, take off the screen protector, and apply firm but gentle pressure all around the screen to try to reconnect anything that might’ve been shaken loose.

So the problem is obviously in the hardware (unless, is it worth trying to update the firmware first??). But my question, then, is where exactly is the problem, and would replacing the screen fix it?

• What is the exact hardware that senses touch? Digitizer? A bracket on the logic board? Or is it something in the screen itself?
• Is there some kind of connector that’s been knocked loose that I need to make sure is intact when I go in to replace the screen?
• Is it at all possible that the problem can be fixed without even replacing the screen, but just reattaching or realigning whatever needs to be corrected inside the phone?
• Is replacing the screen the next best move?

Thank you so much for any help or advice!