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These super-thin, Samsung-made displays act as yet another thermal management tool—backed by layers of copper and graphite to dissipate the heat generated by other components inside the phone.
The camera hole punched into those layers is, of course, intentional and carved away "pixel by pixel" by a laser. The hole runs through both midframe and motherboard back to the camera itself.
Unlike the camera, the hidden proximity and fingerprint sensors can "see" directly through the OLED matrix, allowing for the most "edge-to-edge" screen we've seen in a teardown. You'd probably never see them during normal use, but here with the displays detached, they're easy to spot.