Android 10 was released earlier this week, and the source code has hinted at a 90Hz display for the Pixel 4.
In the source code, a device described as P19 – likely shorthand for Pixel 2019 – is referred to as a device with a 90Hz display toggle. The toggle would presumably allow you to switch between 90Hz and a lower refresh rate of 60Hz.
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https://www.trustedreviews.com/news/android-10-lets-slip-details-of-the-google-pixel-4-display-and-we-cant-wait-3935967
