Patent ID: 7663681

Claim:
A method of driving a complementary metal oxide semiconductor active pixel which includes a photodiode generating signal charges according to received photons at a predetermined collection node, a transmission transistor providing the signal charges to a predetermined floating diffusive node in response to a predetermined transmission control signal, the floating diffusive node receiving the signal charges transmitted by the transmission transistor, a reset transistor resetting the floating diffusive node in response to a predetermined reset control signal, a driving transistor controlled by a voltage level of the floating diffusive node, and a select transistor transmitting the voltage transmitted by the driving transistor to a corresponding data line in response to a predetermined row select signal, the method comprising: (a) performing a reset sampling section to sample a reset level of the data line according to a voltage of the reset floating diffusive node; (b) performing a data sampling section to transmit the signal charges generated in the photodiode to the floating diffusive node and sample a data level of the data line according to a voltage of the floating diffusive node which is determined by the signal charges; and (c) performing a preliminary section to match the voltage of the collection node before the action (b) is performed and the voltage of the floating diffusive node after the action (b) is performed, wherein the preliminary section comprises a first equalization region in which the reset control signal is deactivated and the transmission control signal is activated.