Abstract: A unit pixel timing control method of an imaging device having a WDR pixel array with an nPD structure is provided. The unit pixel timing control method including the steps of: causing a reset transistor (RX) to reset a floating diffusion region (FD) when an exposure time of n (where n is a natural number of 2 or greater) photo diodes (PD) of a unit pixel expires; causing a timing generator to supply a first sample and hold pulse (SHR) for outputting a signal corresponding to a reference voltage (Vref) which is a potential of the floating diffusion region; (a) causing a transfer transistor, which is disposed to correspond to one photo diode, to transfer photo-charges accumulated in the photo diode to the floating diffusion region; and (b) causing the timing generator to supply a second sample and hold pulse (SHD) for outputting a signal corresponding to a signal voltage (Vsig) which is a current potential of the floating diffusion region.

Abstract: A controlling method of an image sensor is disclosed. The method includes: measuring a first output voltage of a drive transistor, a gate of which is combined to a floating diffusion region, after a predetermined integration time; resetting the floating diffusion region by turning on a reset transistor connected between the floating diffusion region and a power supply group; measuring a reference voltage outputted from the drive transistor; transferring electric charges generated in a photo diode by sensing light inputted from the outside to the floating diffusion region by turning on a transfer transistor connected to the photo diode; and measuring a second output voltage of the drive transistor; wherein an image is generated by using a voltage difference between the first output voltage and the reference voltage, and a voltage difference between the second output voltage and the reference voltage.