... Not to pick on this particular question, but
from the perspective of a designer, the difference
between a text display and a graphics display is just
not so big as to be an interesting question. But if
we ask the question from a designer's point of view,
such as, "what was the first CRT display that was under
program control and was included for the express purpose
of being an output device?"
By that definition, the year would be not later than 1961 (when the PDP-1 and its CRT I/O
device appeared).
paul