It seems some people are wondering why Apple is going for a tandem stack OLED panel instead of a traditional OLED panel. One word: brightness. Apple eschewed OLED earlier because it simply wasn’t bright enough. Look at any other OLED table or laptop screen of comparable size and you’ll find max brightness of about 400 nits, give or take. Because OLED is made up of organic material, it degrades when subjected to heat, so OLED devices have limits to how bright they can get to avoid burn-in. Samsung’s own top-of-the-line tablet barely achieves 400 nits. I have one of those, and it is rather dim, though the picture is incredible otherwise.
Apple went mini-LED because OLED could not be made bright enough for a device that’s supposed to last 5-7 years, unlike phones which are generally replaced every 2-3 years and have much smaller panels. You’ll notice iPhones and other Androids can now reach 1750 nits to 2000 nits, but that’s because they are expected to last for less than half the time of a tablet. While HDR has specs that can work at 400 nits, Apple considers that fake HDR. Their Studio Display can display HDR at 600 nits, but notice Apple doesn’t advertise it as an HDR-capable monitor, even though it technically is. 1000 nits is typically considered the minimum brightness for real HDR.
The tandem stacked OLEDs reduce heat and double the brightness because there are two LED’s where there was one. That can extend the lifetime of a screen to that 5-7 years and still be able to attain the brightness of a mini-LED screen. But why OLED instead of mini-LED? OLED has true blacks and infinite contrast, while you can make backlighting only so small for mini-LED, which leads to blooming. OLED is the ultimate picture quality now, but is dim in its standard version. This version gives mini-LED brightness with the quality of OLED’s fantastic contrast. Yield for such a large panel along with its new technology is going to be lower than standard OLED panels, hence the higher cost. In the near future, it’ll be a lot more expensive, but with Samsung’s new production line and eventually higher yields, those prices will come down.
The panacea is micro-LED, otherwise known as inorganic LED. Inorganic material doesn’t degrade with heat with no possibility of burn-in, so the best quality possible in the near future is micro-LED with all the benefits of OLED and brightness of LCD without any of the drawbacks of either, likely getting rid of the PWM (pulse width modulation) problem some people have with OLED, which looks like flicker.