Patent ID: 9225919
Filing Date: 2015-12-29
Classification: H04N

Abstract:
1. A method of operating with an image sensing pixel that includes a photodiode, a given transistor coupled between the photodiode and a bias voltage, a charge storage region, a global shutter transistor coupled between the photodiode and the charge storage region, a floating diffusion region, and a transfer transistor coupled between the charge storage region and the floating diffusion region, the method comprising: with the photodiode, converting incident light into first accumulated charge during a first integration period; following the first integration period and with the global shutter transistor, transferring the first accumulated charge from the photodiode to the charge storage region; following the transfer of the first accumulated charge, resetting the photodiode with the given transistor; after resetting the photodiode, converting incident light into second accumulated charge during a second integration period, wherein the first and second integration periods have substantially equal lengths; and following the second integration period and with the global shutter transistor, transferring the second accumulated charge from the photodiode to the charge storage region such that the first and second accumulated charges are summed in the charge storage region as a combined accumulated charge, wherein resetting the photodiode comprises resetting the photodiode over a delay period, and wherein the delay period is at least a hundred times the length of the first integration period.