Despite the fact that this thread is 3 years old at least, your statement is plain bs. Why would it look like ass?
Because its going to be a little thing in the middle of the large display (i assume it can be centered?)
due to no use of 64 x 32 pixels worth of display
and the majority of machines dont use the 192x64 format, so you are left with most DMDs being that way.
Going the other way though i imagine is even worse?
LCD at least does not care
Have a 720 x 404 DMD if you want