Exposure control for image sensors

摘要

A method of operating an image sensor. Charge accumulated in a photodiode during a first sub-exposure may be selectively stored in a storage node responsive to a first control signal. Charge accumulated in the photodiode during a first reset period may be selectively discarded responsive to a second control signal. Charge accumulated in the photodiode during a second sub-exposure may be selectively stored responsive to the first control signal. Charge stored in the storage node from the first and second sub-exposures may be transferred to a floating diffusion node responsive to a third control signal.

主权项

1. A method of operating an image sensor, comprising:
selectively storing, responsive to a first control signal, charge accumulated in a photodiode during a first sub-exposure in a storage node; selectively discarding, responsive a second control signal, charge accumulated in the photodiode during a first reset period, wherein a first duration of the first sub-exposure is less than a second duration of the first reset period; selectively storing, responsive to the first control signal, charge accumulated in the photodiode during a second sub-exposure in the storage node; and transferring, responsive to a third control signal, charge stored in the storage node from the first and second sub-exposures to a floating diffusion node.