| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solid-state image pickup device which can suppress the deterioration of photosensitivity of a photodiode and the increase of noise signals owing to scale-down of the unit pixel size. <P>SOLUTION: A solid-state image pickup device as an embodiment includes: a photodiode; a second diffusion layer; and means for setting a reference voltage. The photodiode has a first diffusion layer capable of accumulating carriers generated by an photoelectric effect, and is formed on a substrate. The second diffusion layer borders the first diffusion layer and has a polar character opposite to that of the first diffusion layer. The means for setting a reference voltage is connected with the second diffusion layer through wiring. The means for setting a reference voltage applies a variable voltage changing with time sharply to the first diffusion layer through the second diffusion layer, thereby setting a voltage based on the amplitude of the applied variable voltage as a reference voltage of the first diffusion layer. <P>COPYRIGHT: (C)2012,JPO&INPIT |
