Patent ID: 6150676
Filing Date: 2000-11-21
Classification: H01L,H04N

Abstract:
A MOS type image sensor having an image area containing an array of pixels and a peripheral circuitry area having a peripheral circuit disposed in a first well region of a first conductivity type for driving the image area, each pixel comprising:(a) a second well region of the first conductivity type, having a lower impurity concentration than the first well region;(b) a photodiode having:a first main electrode region made of the second well region; anda second main electrode region formed as a first diffusion layer of a second conductivity type opposite to the first conductivity type, disposed at a part of the surface of and in the second well region;(c) a read transistor having:a first main electrode region made of the first diffusion layer;a second main electrode region formed as a second diffusion layer of the second conductivity type disposed at a part of the surface of and in the second well region;a gate insulation film disposed on the surface of the second well region between the first and second diffusion layers; anda gate electrode disposed on the gate insulation film and connected to a read signal line; and(d) an amplification transistor disposed in a third well region of the first conductivity type, having:a gate electrode connected to the second main electrode region of the read transistor;a first main electrode region connected to an output signal line; anda second main electrode region.