QD-OLED is an engineering improvement, i.e. combining existing researched technology to improve the result product. I wasn't able to find a good source on what exactly it improves in efficiency, but it's not a fundamental improvement in OLED electrical→optical energy conversion (if my understanding is correct.)
In general, OLED screens seem to have an efficiency around 20≈30%. Some research departments seem to be trying to bump that up [https://www.nature.com/articles/s41467-018-05671-x] which I'd be more hopeful on…
…but, honestly, at some point you just hit the limits of physics. It seems internal scattering is already a major problem; maybe someone can invent pixel-sized microlasers and that'd help? More than 50-60% seems like a pipe dream at this point…
…unless we can change to a technology that fundamentally doesn't emit light, i.e. e-paper and the likes. Or just LCD displays without a backlight, using ambient light instead.
In general, OLED screens seem to have an efficiency around 20≈30%. Some research departments seem to be trying to bump that up [https://www.nature.com/articles/s41467-018-05671-x] which I'd be more hopeful on…
…but, honestly, at some point you just hit the limits of physics. It seems internal scattering is already a major problem; maybe someone can invent pixel-sized microlasers and that'd help? More than 50-60% seems like a pipe dream at this point…
…unless we can change to a technology that fundamentally doesn't emit light, i.e. e-paper and the likes. Or just LCD displays without a backlight, using ambient light instead.