I been thinking about global shutter ,i think i know now how make it.
On 20mp rolling shutter there is 5500 wire over sensor and 3600 pixel on each wire.
On global shutter pixels are arranged to boxes not lines,could call them super pixels and readout from super pixel is spirale. so no rolling shutter efects.
This is global shutter becouse
GLOBAL SHUTTER READS ALL super PIXELS SIMULTANEOUSLY.
Recent huge readout bumb on prototype sensors is from wiring is layered as multiple stacks and imrpoved computer powers.
So more super pixel and smaller super pixels.
Not saying 20 million wire global shutter wouldnt be plausible. i am just bit suspicious. would explain why canon looked like falling behind phonecameras,even they just hid their advancing.