µLEDs on the other hand are a completely new, largely unproven technology.
That is a good point. I'm hoping that the latest leaks are true and that we start seeing some products this year.
Samsung has been using OLEDs in their phones since 2010 at least.
Sure, but OLED display of iPhone X was still on a different level when it was first released. What I am trying to say that Apple has waited a long time for the OLED tech to be mature enough for their purposes and even then they only use it in their flagship phones. The question is whether the same kind of high-end OLED can be up scaled to a use in a laptop display before uLED technology is ready.
Apparently not that difficult. Lenovo, Dell, HP, and Razer all offer laptops with OLED displays, in part since 2017. And let's not forget that OLED TVs and monitors have been on the market for more than a decade already.
Well, of course, but these displays are not any better than what Apple uses now (they have better contrast obviously but that's about it). Currently, high-end IPS displays beat the OLED ones. Unless OLED laptop displays make a significant jump this/next year, why would Apple want to use a dimmer and more power-hungry screen? Still waiting for proper reviews to appear for Yoga C730 and Spectre x360 OLED, but for example Alienware 13 R3 does not impress me at all with its display.
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Apple is conservative company so they do not experiment with the technology that create significant risk from financial, technology, quality, customer perspective and warranty.
Maybe we are looking at different companies here? Apple's track record of taking risks like these is kind of legendary. In most recent times: HiDPI displays, non-replaceable components, USB-C only, removal of the escape key, introduction of security coprocessor, a completely new keyboard design (which in retrospect ended up being flawed). And it's not a recent thing, Apple was doing this kind of stuff under Steve Jobs all the time. They are also known to be their user base for experiments , e.g. iOS is being used to experiment with software design and new APIs before they get finalised, hardware with half-baked drivers.