This thread is making me think my WS color is faded as well in some way. I thought it was tough to look at, but thought I may just have old eyes. This is with high contrast and balancing the contrast wheel.
I took took the screen from my broken Crystal and put it in the working one. The brightness and clarity seems like a decent improvement to me. Not perfect but not far off my NGPC. Games are perfectly playable if I get the right viewing angle and lightsource.
Perhaps it can be better still? But I’m pleased so far.
Interestingly, if I turn the lights off in my living room and just use the natural light of a cloudy winter day through the window, the picture clarity if just as good if not better, so I wonder if there’s something about my artificial lights that the Wonderswan doesn’t like