Inspiron 7559 screen replacement

I have an inspiron 7559 with the UHD touchscreen. I suspect the screen is cracked, it's leaking LCD fluid and starting to fuzz out. I want to replace it with a FHD screen but would like to know if I need to replace the entire LCD assembly or just a FHD screen replacement is required.

Reason for asking is to clarify what was mentioned in this other post, 

"The UHD screen resolution is 3840 x 2160 and comes only with a touchscreen. You would need to change the entire LCD assembly."

https://www.dell.com/community/Laptops-General-Read-Only/Compatible-screens-for-Inspiron-7559/td-p/5077328