/vr/ - Retro Games

From my understanding of flat screens the color making part and the light making part are different things. Soooo, shouldn't it theoretically be possible to take the light making panel off the back of an AGS-101 screen and put it behind a regular 60 Hz GBA screen, maybe with some foil removed or something?

The Game Boy Color has a two times higher processor clock and three times higher memory size than the original Game Boy, yet there's a good chunk of Game Boy Color games that are compatible with the original Game Boy - albeit without colors - with no apparent slowdown. Why is that?