Is there a way to have your tablet as your second monitor and keep the same screen quality?

I tried to use the build in second monitor option but while it works perfectly and is super easy to use since it connect directly and I don't need an app or anything it really has a terrible quality

It felt like having my pc being full HD and my tablet was like 360p or something, it's basically unusable... Did anyone else had that issue and know how to fix it?