Reflective LCD's were used in quite a few early laptops. I used one for a long time. The issue was they were monochrome. It's color ones that didn't get trac

Reflective LCD's were used in quite a few early laptops. I used one for a long time. The issue was they were monochrome. It's color ones that didn't get traction, and everyone started wanting color screens. I've never used a Pixel Qi but I saw one briefly once. It was ok, I'd be interested in something that used it for power consumption and outdoor reasons, but iirc its colors were washed out compared with conventional TFT screens. That might be why they didn't catch on. Refresh might have also been too slow for video, dunno.