That’s usually called a teleprompter when it’s the scrolling text a news anchor reads, or a news ticker when it’s the moving text bar on the screen.

  • Teleprompter : the script shown to the presenter so they can read it while looking at the camera.
  • News ticker : the moving text strip, often at the bottom of the screen, that shows headlines or updates.

If you meant the one the anchor reads, it’s teleprompter. If you meant the scrolling bar viewers see, it’s a news ticker.