What happens if I use screens with different resolution capabilities?

When sending a signal point to point a TV will digitally communicate it’s capabilities to the source, with the source then responding by outputting compatible signal to be received bt the TV, such as 1080p and stereo audio, for example. 

The use of displays with different capabilities, such as picture resolution and audio, in the same installation can be problematic as each source can only send one signal at a time, even when using a matrix switch to mediate the signal.  A signal that tries to force its way onto a display that is incapable of receiving it will typically result in transmission failure.  

To avoid such a situation, the system will typically output for the display with lowest capabilities, so if the matrix installation includes three 1080p screens and one 1080i screen, the resultant image would be 1080i across all screens. The matrix switches do not scale per output but instead negotiate with the source a signal that all screens are capable of supporting.  Successful signal transmission is the objective.