The SA-147/S achieves this very wide FOV by using two 1920 x 1200 full color OLED microdisplays per eye, each with its own combining prism, for a total of four microdisplays and four prisms. As shown in the photo, each eye, when looking straight ahead, looks through its own prism, allowing the display of stereo images in the central region of the FOV. When the eyes look left or right, only one eye is looking through a prism and the displayed image is showed to only one eye and the image is monocular. This is actually a good match for normal, unaided human vision where the human vision is binocular in the central region where both eyes are looking nearly straight ahead. When looking to the side, for example, to the left, only the left eye can see anything and the right eye does not cover that region.
https://www.displaydaily.com/article/display-daily/sa-photonics-introduces-pilotvision-hmd
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