@VRGIMP27 you might have some insights. As you have mentioned mirrors in VR before
Virtual Boy’s 1×240 pixel display. What if we replace the red Column with RGB with a higher Res say 1×2880/eye or more with the moving mirror.?
From Wikipedia for background
"The Virtual Boy is the first video game console capable of displaying stereoscopic 3D graphics, marketed as a form of virtual reality.[38] Whereas most video games use monocular cues to achieve the illusion of three dimensions on a two-dimensional screen, the Virtual Boy creates an illusion of depth through the effect known as parallax. Like using a head-mounted display, the user looks into an eyeshade made of neoprene on the front of the machine, and then an eyeglass-style projector allows viewing of the monochromatic red image.
The display consists of two two-bit (four shade) monochrome red screens of 384×224 pixels[39] and a frame rate of approximately 50.27 Hz.[40] It uses an oscillating mirror to transform a single column of 224 red LEDs into a full field of pixels. Nintendo claimed that a color display would have made “jumpy” images and have been too expensive.[10] A color display would have required red, green, and blue LEDs; blue LEDs were then considerably expensive. This, plus the other drawbacks, influenced the decision for monochrome."
https://en.wikipedia.org/wiki/Virtual_Boy#:~:text=The%20Virtual%20Boy%20is,the%20decision%20for%20monochrome.
Whike the Nintendo Virtual Boy has a very low Res compared to today. It has some very advanced ideas used it. There was even originally planned to be a VR headset. But due to Potential product liability we only got the desktop edition. 
At the time Blue LEDs were new age very expensive. The Red less with the mirror though did create a very smooth picture and maybe with modern technologies this old idea may need to be revisited/experimented.
With modern Optics and other technologies that now exist an RGB SLA display might be quite interesting