I think the
Notion Ink Adam would have qualified (I'm using past tense because the Notion Ink website looks dead.) Android, PixelQi screen which they ruined by putting glossy glass over the top, and IIRC it had a buggy implementation and never delivered.
There may be something from PixelQi in the works, but they sure have been very, very quiet for the past year. I never saw an actual product come in the wake of their 'better than Retina' hype.