Sharp Quattron TVs introduce a fourth, yellow, pixel into the RBG matrix. I was mostly interested in the gamut, and
this review shows a gamut chart before and after calibration - the gamut is not spectacular, and delta E values are actually quite bad (compared to projectors which I'm more familiar with).
AVS Forum has more on the topic, with links to (conflicting and inconclusive) reviews on the second page.
In any case, it shows Sharp is willing to
really think outside the box, and hopefully this will be a worthwhile technology as it matures.
