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What is used for mirrorless cameras is On-Sensor PDAF.
This is different from PDAF in principle of operation and has phase detection pixels on the sensor.
This refers to the whole from Nikon Z to Olympus.
Of course Fujifilm, Sony, Sigma and etc... are included. Otherwise, Contrast AF is used for that mirrorless camera.
On-Sensor PDAF Pros
Since it does not require a dedicated AF mechanism, it can be mounted on compact cameras, mirrorless cameras, smartphones
AF operation faster than contrast AF can be performed
It can be combind with contrast AF
It can also be used for movie-shooting and live-view shooting which cannot be used with PDAF
The AF accuracy is higher than the phase difference AF
On-Sensor PDAF Cons
AF operation is somewhat inferior to PDAF
There is a trade-off between the AF sensor points and the number of pixels. If priority is given to image quality, the AF performance is degraded, and If priority is given to AF performance, the image quality will be degraded. For this reason, each manufacturer is focusing on reducing the adverse affects on image quality.
In the case of a system in which all the pixels are divided into two (DPAF), the load of signal processing is high and the power consumption is increased, which negative influence the power-saving performance.
Like the phase difference AF, There are disadvantageous in AF operation at low illuminance.
