The strange answer to this question is Clare of Assisi. Why is is strange? Well, there was no TV in Clare’s time for one and two, Clare was in a secluded community of women’s religious modeled after St. Francis’ teachings. In fact, Clare and Francis were quite close and she cared for Francis at the end of his life when he was ill. So the patron saint of TV never even watched one show or saw the invention itself.
So why television?
Pope Pius XII declared Claire the patron saint of TV because as was nearing the end of her life and was too ill to attend Mass, images of the Mass appeared on the wall of her cell much like a TV screen would look.