Interestingly, the only non-Samsung TV on the list is the Vizio P-series Quantum, which contains a QD film with Nanosys Hyperion QDs. This technology is a hybrid cadmium-containing green QD, and non-Cd red QD, with an overall cadmium content of <100 ppm which makes it RoHS compliant. The green CdSe emission peak width is presumably much narrower than the non-Cd QDs used in Samsung displays, but interestingly, the gamut is not quite as high as the Samsung Q7s on the list which is measured a couple of points higher for both DCI-P3 and Rec2020. There any many other optical components in the display that will also contribute to the gamut, not the least of which are the color filters which have a major impact on both color and brightness, so I’ll chalk up the difference to “other optical components” for now.
So, QDs are great for color (we knew that already) but as we all know, the color gamut is only one small piece of the puzzle, and it may not carry the most weight for many consumers. I’ll admit that price is probably on the top of my list when I buy a new display, and for many others it is features like functionality, resolution, brightness, contrast, form factor (thin). Since people like to compare QLEDs to OLEDs so often, let’s look at the category where OLEDs do quite well – contrast.
Since OLEDs can actually turn off each pixel completely, resulting in NO light emission (while LCDs rely on leaky color filters and liquid crystals to determine light throughput), it’s no surprise that OLEDs take the cake and are the top 9 TVs tested for contrast (in fact these are the only OLED TVs tested). We can argue over the infinite contrast ratio listed here, but the fact remains that they are much better than any LCD out there.
Closely related to contrast, brightness is an increasingly desirable (and advertised) metric. Very few of us watch our TVs in a dark room anymore, and the brighter the TV the better it will look when the afternoon sun is creeping into our living rooms during Football season. Here the QD-enabled TVs generally do better than the OLEDs, but there are a few (dare I say “normal”) LCD sets that outperform the QD sets. There are only 5 models that reach >1000 nits for “real scene brightness” (a small white box over normal content), and only one of those contains QDs (Vizio). However the 2018 Samsung Q#’s are not far behind, and all are higher rated than the very top OLED on the list (2017 LG C7).
One other notable area where OLEDs have been bashed recently is the burn-in problem (See our own Ken Werner’s deep dive with his recent blogs “How bad is the OLED-TV burn-in problem?” and “Solving the OLED burn-in problem”). Well, lucky for us RTings just published their 1-year update recently. I think many of us could have predicted the results. For me there were two main takeaways:
1. Static content burns in on OLEDs… sometimes very badly
2. If you watch varied content, you are probably ok
The funniest result? A “ghost” appears on the TV showing CNN all day long. Apparently, the camera people are really good at keeping subjects centered and of similar size. Or perhaps Sarah Sander’s glare went right through the feed and into the pixels.