Visa officers primary concerns are if you have sufficient money to cover your living expenses and if you can pay your fee. They feel more than satisfied if they come to know applicant has been awarded fully funded scholarship; which means his fee is already covered for the standard duration of his PhD program with the regular living stipend.
However, to make your case strong; you should attach bank statement. This statement should show that your financial capability in your home country is not deteriorating and you are living in good conditions. But this amount does not necessarily need to be higher or equivalent to your fee + living expenses in prospective country since you are already on scholarship. You are just showing to prove that your home-land is already providing you a good life, you are just going abroad for ''higher education'' and does not represent that you wish to permanently stay in a prospective country.
Ideally, the amount in the bank statement should be more than or equivalent to ''arrival and departure ticket'' plus enough money to pay initial deposits before opening bank account in a foreign country.