Question Vector display image effect?

I'm looking for or trying to create an image effect that would look like an old-school vector display, where the graphics are being drawn with a beam. Where the beam is drawing would be brighter and then fade to the actual color. See attached.

I'm just doing this with a trail renderer and animated text, but I need to be able to do it for other graphics as well. I'm thinking if the pixel is brighter than in the previous frame, it would get highlighted in the effect and then fade. Does something like this exist or does anyone have any suggestions?

Thanks.