| abstract |
An image sensor includes a photo detector for accumulating charges in response to an incident light, a floating diffusion node, a first reset unit connected between a supply voltage node and the floating diffusion node, a transmission unit for transmitting accumulated charges from the photo detector to the floating diffusion node, a source follower output unit for converting charges stored in the floating diffusion node into an output voltage, a first selection unit for outputting the output voltage selectively, and a second selection unit connected between the floating diffusion node and the source follower output unit. Dark current may be reduced or prevented from flowing from the source follower output unit into the floating diffusion node. |