Resolution problem in 5 inch screen

Question

I have one 5" screen, when I connect it to my Raspberry Pi see like this:

But when I connect it to my computer the screen works well:

I tried with change the parameter in video section in config.txt document from 1 which means 4:3

sdtv_aspect=1

to 3 which means 16:9

sdtv_aspect=3

but didn't work.

Please help I needto work with the complete screen.

Thanks for your time!