I suspect there was a limit to how fast you can raster scan these and hence how many lines of resolution you can achieve. The next technological step with lase

I suspect there was a limit to how fast you can raster scan these and hence how many lines of resolution you can achieve. The next technological step with laser scanning was to move from straight lines to harmonic motion: your mirror has a resonant frequency and you vibrate one axis at a low frequency and the other at a much higher harmonic but now you need to draw your picture across a complex lissajous pattern with non uniform brightness, requiring a lot more dsp and timing precision I suppose. I was excited to see this progress but nothing commercial ever came of it. R&D was being done at Fraunhofer Institute. The other problem with these laser projectors is the bright “sparkle” pattern they produce.