| 摘要 |
PURPOSE:To increase the maximum quantity of an electric charge accumulated in a photodiode by making a substrate voltage an alternating current voltage in which a plane is reversed synchronously with a vertical scanning drive pulse and increasing a potential difference between both the voltages. CONSTITUTION:A vertical scanning drive pulse phiV supplied to a solid-state image pickup element 20 is outputted at a peak value 9V in a vertical cycle, a substrate voltage VSUB of a substrate 11, synchronously with a remaining interval being 0V, is changed to a high level period of the pulse phiV, for instance -5V and other interval is made 0V. According to a waveform of a voltage of the substrate voltage VSUB, there is a connecting capacity between a wall layer (p+) between channels and a photodiode 12, so that a potential of the photodiode 12 is equivalently raised and a wall of the photodiode 12 is raised. Thereby, the maximum quantity of an electric charge moved to a vertical transfer part 13 can be enlarged. |
