Alles anzeigenThis depends on yourself.
Display 4:3 as means: if the broadcaster sends an old movie made for tv, that is in aspect ratio 4:3, then you can either watch it as is (Pillarbox), that means with black borders at the left and at the right, or you can scale the image to fit your screen. Depending on the method you either get very wide faces (just scale) or loose some content at the top and the bottom of the picture (just scale), or something inbetween, where the middle of the picture is left as it is and the borders are stretched a little bit (non linear).
For me the best solution is pillarbox, as it does not manipulate the picture and with 50" the picture is still big enough.
And for >16:9 it is the same but for cinemascope- movies (21:9 or any other ratio than 16:9
Thanks