how does a Flat CRT Screen work?

Question

I know that Cathode rays exist in the form of streams of high speed electrons emitted from the heating of a cathode inside a vacuum tube, at its rear end.The emitted electrons form a beam within the tube due to the voltage difference applied across the two electrodes (the CRT screen typically forms the anode). The beam is then perturbed (deflected), either by a magnetic or an electric field, to trace over ('scan') the inside surface of the screen (anode). The screen is covered with a phosphorescent coating (often transition metals or rare earth elements), which emits visible light when excited by the electrons.Which means you need a curved surface to make the image appear undistorted so how do they do it with a flat surface?

Thanks ahead of time!

Answer 1

If you are talking about a totally flat regular CRT, you use electronics to bend the beam so that has a different curve at the top and bottom vs the middle. Many computer monitors have a "pin cushion" adjustment that actually lets you pinch the middle in.
If you are talking about a thin or flat screen CRT, it gets even trickier in that the neck points down and the electrons are beamed up and then bent forward to hit the screen.