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I have an s9 and I’ve dropped my phone which crashed. I tried turning on my phone and it only show the top half and the bottom half green screen flickering. I’m not sure which part of the phone I should get fix and I have little to no knowledge about this.

Samsung Displays are the more high tech on the market, OLED Display ,TouchScreen and Front glass come from factory in sandwich mode less than 2mm, replacing single parts such as OLED or Touch Screen requires expensive equipment, and in your case you have a bad OLED Display (The Expensive Part), so you have to replace the complete Screen sandwich. SUMMARY: Replace OLED Screen Assembly, is DIY Project, Replace OLED Screen Assmebly with Frame/Housing.

The LCD and the digitizer are basically fused together. You will need to replace both. If you are doing it yourself then good luck, the screen is glued on tight.