Hi Gajana,
The warning is not telling the full story and may actually be incorrect. Fron the Display block doc page:
"The Display block shows the first 200 elements of a vector signal and the first 20 rows and 10 columns of a matrix signal."
From a bit of testing, it looks like the row and column contraints for a matrix signal are enforced independently, as opposed to allowing any number of rows and columns as long as the prodcut is less than 200.
