[Dylrob]

Originally Posted by LDBoblo

Those are not color reflective LCDs. Those are weakly backlit. Traditional color LCD designs have such poor light transmission that a rather strong backlight is needed.

The Game Boy Color and Game Boy Advance (original) were definitely reflective LCDs. Though I guess the Game Gear, which I've never seen in person, wasn't.

Originally Posted by LDBoblo

Edit 2: Yeah. I spoke too soon about the Nintendo versions. They used frontlights with reflective screens until a later revision switched to a brighter backlit solution.
http://gameboy.ign.com/articles/652/652641p1.html

Yeah, the early Advance SPs had a front light. Later models, which the fans dubbed "mk II", were backlit. Unfortunately neither the GB Color nor first Advance model had any sort of built-in lighting. And being color reflective LCDs that was a problem.