The original Baird system was a mechanical one, which used electrical current to convert an image to a signal that could be transmitted along a wire - in the same way that sound works.
It didn't have a CRT type tube display - that was the invention of Marconi a little while later.
In the respect that LCD monitors use an electrical current to produce what is, in effect, a mechanical change, they are probably closer to the Baird concept than the later CRT system.
Or am I talking rubbish as usual?!