Patent ID: 8446504

Claim:
A solid-state imaging device comprising: a pixel array in which a plurality of unit pixels are arranged in row and column directions, each of the unit pixel including a photodiode configured to perform photoelectric conversion, a read transistor configured to read a signal charge converted and accumulated in the photodiode to a floating diffusion, a reset transistor configured to set a voltage of the floating diffusion to a power source voltage, and an amplifying transistor in which the voltage of the floating diffusion is applied to a gate terminal and a power source voltage is applied to a power source terminal when a row of the unit pixel is selected; a plurality of vertical signal lines that are respectively arranged to columns of the pixel array and respectively connected to an output terminal of the amplifying transistor of each unit pixel in the column direction; a bias voltage generation circuit configured to generate a bias voltage applied to each of the plurality of vertical signal lines via each of a plurality of first switches; a plurality of current sources respectively connected between each of the plurality of vertical signal lines and a circuit ground via each of a plurality of second switches; and a pixel driving circuit configured to cause the amplifying transistor to form a source follower circuit, wherein the pixel driving circuit causes the bias voltage generation circuit to generate a bias voltage which is raised or lowered according to brightness of a subject, wherein when the brightness of the subject is lower than a reference value, the pixel driving circuit outputs an instruction to generate a bias voltage lower than a reset voltage of the vertical signal line in a period in which the reset transistor is turned on to the bias voltage generation circuit.