It is
Micro OLED not
micro LED or OLED.
Micro-OLED's main difference from "traditional" OLED is right in the name. Featuring far smaller pixels, micro-OLED has the potential for much, much higher resolutions than traditional OLED: think 4K TV resolutions on chips the size of postage stamps. Until recently, the technology has been used in things like electronic viewfinders in cameras, but the latest versions are larger and even higher resolution, making them perfect for Vision Pro (with much higher cost too).
If we take a look at Apple's claims, we can estimate how small these pixels really are. Firstly, Apple says the twin displays in the Vision Pro include "More pixels than a 4K TV. For each eye" or "23 million pixels." A 4K TV is 3,840x2,160, or 8,294,400 pixels, so that should equate to around 11,500,000 pixels per eye for the Apple screens.
Next, Apple partnered with
Sony (or maybe
TSMC) to create these micro-OLED displays and they are approximately 1 inch in size. To calculate the size of each pixel I'm going to use 32-inch 4K TVs as a comparison, and these boast about 138 pixels per inch. We don't know the aspect ratio of the chips in the Vision Pro, but if they're a square 3,400x3,400-pixel resolution that would be a total of 11,560,000 pixels, so that's a safe bet. So, if that's the case, these displays have a ppi of around 4,808 and that's more than almost anything else on the market, and that's by a
lot. Even the high-resolution OLED screen on the
Galaxy S23 Ultra has a ppi of "only" 500.
Vision Pro displays are so close to your eyes that they need to be extremely high performance in order to be realistic. They need extreme resolution so you don't see the pixels, they need high contrast ratios so they look realistic, and they
need high frame rates to minimize the chance of motion blur and motion sickness. In addition, being in portable devices means they need to be able to do all that with low power consumption. The answer is Micro-OLED, but at a cost which makes $3,499 a great deal for consumer.