Some Japanese broadcasts may also have full caption, full text headings for the deaf and hard of hearing. As Mike said, graphics splashed across the screen or as rolling headlines are purely for entertainment value and visual impact. Virtually everyone now can understand standard Japanese thanks to compulsory education, improvements in mass communication and literacy, etc.
I mean native speakers can even catch radio content where mumbling and homonyms need to be either ironed out beforehand or explicitly described in terms of the kanji being explained.