Image sensor, method of reading control, and electronic device

A method of reading control of pixel signals, the method comprising the steps of:

• performing, by a first A/D converter, A/D conversion of a reset level to be used for correlated double sampling;
• after resetting a floating diffusion provided in a pixel array unit in which same-color pixels that share the floating diffusion are connected to an identical first vertical signal line, transferring, to the floating diffusion, an electric charge of a first pixel of the plurality of pixels that share the floating diffusion;
• after transferring the electric charge of the first pixel to the floating diffusion, transferring an electric charge of a second pixel to the floating diffusion;
• performing, by the first A/D converter, A/D conversion of a signal level of the first pixel in accordance with a clock signal of a first frequency, wherein the first A/D converter is connected to the first vertical signal line;
• and
• performing, by the first A/D converter, A/D conversion of a signal level of the second pixel in accordance with a clock signal of a second frequency obtained by dividing the first frequency by a predetermined division ratio.

An electronic device comprising:

• an optical unit including a lens;
• an image sensor configured to receive light incident through the optical unit, the image sensor comprising:
• a pixel array unit in which same-color pixels that share a floating diffusion are connected to an identical first vertical signal line;
• a reading control unit comprising a transistor configured to control reading of an electric charge from a plurality of pixels that share the floating diffusion so as to transfer, after resetting the floating diffusion, to the floating diffusion an electric charge of a first pixel of the pixels that share the floating diffusion, and after transferring the electric charge of the first pixel to the floating diffusion, to transfer an electric charge of a second pixel to the floating diffusion;
• and
• a first A/D converter connected to the first vertical signal line, the first A/D converter being configured to perform A/D conversion of a signal level of the first pixel in accordance with a clock signal of a first frequency, and to perform A/D conversion of a signal level of the second pixel in accordance with a clock signal of a second frequency obtained by dividing the first frequency by a predetermined division ratio, wherein before the electric charge is transferred from the first pixel, the first A/D converter performs A/D conversion of a reset level to be used for correlated double sampling;
• and
• a signal processing unit configured to process pixel data that is output from the image sensor.