He used the 42mm Apple Watch which has a resolution of 312 x 390 pixels or about 326 pixels per inch for the photos.
Interestingly, the Apple Watch pixels look very different from the iPhone pixels. This may be because the Apple Watch display is an AMOLED screen, I don’t know. But what surprised me was the actual pixel imaging sites are quite small in comparison to previous pixels in say, the iPhone. This may have something to do with reducing the current load in a device that is very power sensitive. It seems that almost all conversations at Apple these days center around 3 things*, power/current, which relates directly to heat and this display seems to meet those issues by reducing the size of the power consuming light emitting components while preserving the resolution required to meet “Retina Display” requirements.
Check out a few photos below and hit the link for more discussion on the display. You may also be interested in reading DisplayMate's analysis of the Sapphire vs. Ion-X display glass of the Apple Watch.
Read More [via Loop]