Please give me information about Electronic rolling display ppt

Most CMOS image sensors (to save one transistor per cell compared to a true "snapshot" shutter) use Electronic Rolling Shutter. Basically it implements two pointers to sensor pixels, both proceeding in the same line-scan order across the sensor,
One is erase pointer, the other one - readout. Erase pointer runs ahead discharging each photosensitive cell, then follows the readout one. Each pixel sees (and accumulates) the light for the same exposure time (from the moment erase pointer passes it till it is read out), but that happens at different time.
If you will make an image of a fast passing car with ERS with short exposure - it will all be sharp (no blurring), but the car will seem to lean backwards. The roof will be captured at earlier time than the wheels and this time difference across the frame can be as long as 1/15 of a second for the full frame of the MT9P001 5MPix sensor (it is equal to the frame readout time that is equal to 1 sec divided by the frame rate in most circumstances).