public abstract class Display { }
public abstract class Display<TLogic> : Display where TLogic : Logic<Display<TLogic>>
{
    private TLogic logic;
    protected Display(){  }
    public void SetLogic(TLogic log)=> logic = log;
}

public abstract class Logic { }
public abstract class Logic<TDisplay> : Logic where TDisplay : Display<Logic<TDisplay>>, new()
{
    private TDisplay display;
    public void OnStart()
    {
        display = new TDisplay();
        display.SetLogic(this);
    }
}

I’m trying to have a system where Display and Logic would be able to communicate in the sub classes.
This way, I can have MyDisplay inheriting from Display and getting a reference to MyLogic class. The latter also gets its MyDisplay reference by inheriting from Logic.