| 摘要 |
PURPOSE: A unit pixel of a CMOS image sensor is provided to improve dark current property by directly connecting a reset transistor to a photodiode and to improve fill factor by using an improved drive transistor. CONSTITUTION: A photodiode(201) senses a light and generates optical carriers. A reset transistor(204) is directly connected to the photodiode(201) so as to improve dark current. A floating diffusion region(203) stores the carrier generated in the photodiode. A transfer transistor(202) is connected between the photodiode and the floating diffusion region. A drive transistor(206) detects an electrical signal from the floating diffusion region. A select transistor(208) is connected to the drive transistor. At this time, a gate and a drain of the drive transistor(206) are connected each other by using butting contact, thereby improving fill factor.
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