There are global shutter CMOS image sensors. But it comes with a cost. After each frame is exposed the values in the photocoupled capacitors are transferred int

There are global shutter CMOS image sensors. But it comes with a cost. After each frame is exposed the values in the photocoupled capacitors are transferred into neighboring capacitors in one go, then those are read off serially while the photocoupled capacitors are exposed for the next frame. Alternately, each pixel is locally connected to an ADC and enough memory to digitize the image all at once. Canon, for example, announced a global shutter CMOS sensor last year. The problem here is that those extra components come at a cost. Either they crowd out existing components on the sensor, which would dramatically reduce light sensitivity. Or, they require additional layers in the CMOS die, which significantly increases fabrication cost due to design costs, fabrication time, lower yield, etc. Additionally, the extra step in digitization reduces effective frame rate. [1] http://global.canon/en/news/2016/20160831.html http://global.canon/en/news/2016/20160831.html