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TechInsights: Apple Increases Number of PDAF Pixels in New iPhones

TechInsights teardown of iPhone Xs reveals that:

"Our early camera teardown effort has been focused on the 12 MP resolution wide-angle camera, promoted as a new, larger sensor with bigger, deeper pixels. The iPhone XS Max wide-angle camera chip is a stacked imager sourced from Sony and features a 7.01 mm x 5.79 mm (40.6 mm2) die size. This compares to 5.21 mm x 6.29 mm (32.8 mm2) for the iPhone 8/X wide-angle camera chips.

We confirmed the iPhone XS Max’s wide-angle camera pixel pitch of 1.4 µm (up from 1.22 µm) and immediately noticed the increased density of Focus Pixels compared to last year’s iPhone 8/X. The term Focus Pixels is Apple’s branding of masked phase detection autofocus (PDAF) pixels and the higher Focus Pixel count translates to more regions available as autofocus points. Focus Pixels were introduced in 2014 for iPhone 6 and at that time featured left and right-masked Focus Pixel pairs. In 2017 Apple moved from a paired to shared Focus Pixel strategy, where top/bottom masked pixels were added and all were evenly distributed within selected rows/columns. Apple has implemented all of its wide-angle Focus Pixels in the green channel."

12 MP wide-angle camera image sensor die with removed CFA

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