1970s: from Chyron Corporation, its manufacturer. (http://www.oxforddictionaries.com/us/definition/american_english/chyron)
"But Stewart's series also provided a psychic salve, especially during the worst parts of the past few elections and the run-up to the Iraq War. If you were driven nuts by the twenty-four-hour shouters, if you couldn't bear to watch any more of the flashing chyrons and Sam the Eagle gravitas, here was your catharsis."
- Emily Nussbaum, "No more late nights", 23 February & 2 March 2015 The New Yorker (http://www.newyorker.com/magazine/2015/02/23/late-nights)