Patent ID: 6914228
Filing Date: 2005-07-05
Classification: H01L,H04N

Abstract:
1. A solid-state imaging device, comprising: a pixel array including a plurality of unit pixels, each of the unit pixels including a photo diode and an insulated gate field effect transistor that detects photocharges; and a control circuit that controls an operation of the pixel array, wherein: the photo diode and the insulated gate field effect transistor share a well region of a first conductivity type that is formed in a semiconductor layer of a second conductivity type, the semiconductor layer of the second conductivity type being formed on a semiconductor substrate of the first conductivity type; the insulated gate field effect transistor comprises: the control circuit comprises a drain control circuit providing any of constant voltage, a constant current, and constant charges to the drain diffused region; and the control circuit previously forward biases a junction region between the semiconductor substrate and the semiconductor layer by the any of the constant voltage, the constant current, and the constant charges, that is provided from the drain control circuit to the drain diffused region, so as to accumulate a predetermined amount of the charges of the given conductivity type in the accumulation region, and the charges of a given conductivity type accumulated in the accumulation region being discharged thereafter.