Image sensor

An image sensor, comprising:

• a pixel array including a plurality of pixel groups including a plurality of pixels connected to a plurality of row lines and a plurality of column lines, each of the plurality of pixels including a photodiode for generating an electric charge in response to light, and a pixel circuit having a transfer transistor connected between the photodiode and a floating diffusion storing the electric charge;
• and
• a controller configured to sequentially turn on the transfer transistor included in each of the plurality of pixels to obtain pixel signals corresponding to each of the plurality of pixels in each of the plurality of pixel groups,
• wherein the controller adjusts a capacitance of the floating diffusion to a first value by turning off a switch device connected between the floating diffusion and a reset transistor before obtaining the pixel signals, and adjusts the capacitance of the floating diffusion to a second value greater than the first value by turning on the switch device when obtaining one of the pixel signals.

An image sensor, comprising:

• a pixel array including a plurality of pixels connected to a plurality of row lines and a plurality of column lines, each of the plurality of pixels including a photodiode for generating an electric charge in response to light, and a pixel circuit having a floating diffusion for storing the electric charge;
• and
• a controller configured to obtain a first sub-pixel signal and a second sub-pixel signal from the pixel circuit during a first time period based on the charge generated by the photodiode during a first exposure time, generate a first image frame based on the first sub-pixel signal and the second sub-pixel signal, obtain a second pixel signal from the pixel circuit during a second time period, after the first time period, based on the charge generated by the photodiode during a second exposure time, generate a second image frame based on the second pixel signal, and generate a result image using the first image frame and the second image frame,
• wherein the second exposure time begins before the end of the first time period.