A CRT moves the electron beam direction from top-to-bottom, left-to-right. If it sends electrons, the corresponding position on the screen lights up for about 1/50 s. So you can encode your pixels as a 0/1 pulse train, although you do have to take care of the time it takes to move the beam to the next line, and at the end to reset it to the top.

Idk what "NET" is, though.