Retinal neuroscientist Bryan Jones shot a series of beautiful, mesmerizing photos revealing the pattern taken by the Watch's LED subpixels—and other components of the tiny display.
…the biggest advancement for wearables aside from the Taptic Engine is the capacitive component or pressure sensitive, touch screen component of the display which I revealed through a bright indirect fiber optic light illumination. You can see the contact elements as orange dots over the red, green and blue sub pixels.
A commenter writes that blue is bigger because blue LEDs degrade quicker.