That is assuming that the peak white output using RGB stays where it is presently and they scrap the fourth white subpixel.
Originally Posted by fafrd
This is incorrect - sacrificing the white subpixel will increase (by ~33%) the fully-saturated brightness WOLED can deliver but will drastically reduce (by ~25%) the color volume WOLED can deliver...
No, I already stated that eliminating the white subpixel would deliver a 33% increase in fully-saturated output (which also means peak white output without using the white subpixel). The issue is that fully 50% of the white lumens emitted at peak white are coming though white subpixel while the other 50% are coming through the colored subpixels (~1/3 or 16.7% through each color). So while the ‘walls’ (perimiter) of your color volume tent are 33% higher, the center pole is 17% lower (50% - 33%) so peak whites are 17% lower and overall color volume has not increased and probably decreased.
The first step would be to improve the RGB filters so that they can output 700-800 nits by themself, beyond which they can drop the white subpixel leading to an overall improved volume.
For sure, improving the efficiency of the color filters would be great, but unlikely to happen. Moving from conventional color filters to Quantum-Dot-Color-Converters, as Samsung is doing with QD-BOLED) is a much more promising way to increase output levels, but not obvious whether there is anyway to effectively use QDCC with White light (easier with a single incoming wavelength). The increases offered by moving to a high-efficiency Blue OLED emitter and beyond that, intrinsic increases to OLED efficiency through materials used in the stack, offer a clearer, shorter-term, and lower-risk pathway to increasing output levels that changing the color filter/conversion efficiency.
Still some ways off and will have to be a step by step improvement but this (color volume) is one area that should be on lg's priority list. For HDR, it is a relevant metric just like peak brightness.
I don’t think there is any question that increasing color volume is a high priority for LGD. They will continue to incrementally push color gamut as well as peak output levels, both of which improve color volume.
My only disagreement with you is that you seem to believe eliminating the white subpixel will eventually be something LGD will want to do to increase color volume and that is unlikely to happen (at least until LGD can achieve 10,000 nits through each colored subpixel).
Eliminating the white subpixel will always
reduce color volume, so it’ll only happen when volume is maximized without using a white subpixel and there is no value in having even more volume/peak white output.
if samsung's oled technology comes with better color volume out of the gate, it will push lg harder to improve in this area.
When High-efficiency blue is industrialized and in production, Samsung’s QD-BOLED may threaten LG’s WOLED on color volume, but unfortunately, the first generation based on Florescent Blue is unlikely to match WOLED on either peak output levels or color volume.
But you are correct, while LGD wants to focus all of their attention on production expansion and driving down cost to expand market penetration, Samsung and their QD-BOLED initiative will push LGD not to get too complacent and allow WOLED innovation to stall.
Gamut is fundamental, which is why LGDs moving away from a yellow OLED layer to green is a big deal.
Volume and peak output levels are essentially a trade off against lifetime and burn-in and will continue to improve as OLED material science matures.
Looking out over the next decade, WOLED achieving peak brightness levels of 10,000 nits (at least in impulse mode) seems more likely than achieving 100% of Rec.2020...