SOLID STATE IMAGE PICKUP DEVICE

摘要

PURPOSE:To secure the low and high scan speeds and also to reduce the leakage current of a switch to prevent a blooming phoenomenon, by making threshold voltages different in level between elements of horizontal and vertical scan circuits and horizontal and vertical switch elements. CONSTITUTION:Plural photoelectric transducers 4 are arrayed 2-dimensionally on the same semiconductor substrate to store the signal charge corresponding to the optical information. The charge of the element 4 is extracted to a vertical output line 5 by a vertical switch (element) 3 and then sent out by a horizontal switch 6 for a prescribed period. While the charge extracted out of the switch 6 is sent out to a horizontal output line 7 through a horizontal scan circuit 1 consisting of an MOS transistor TR. The element of the circuit 1 and the threshold voltage of a vertical scan circuit 2 are set at different levels. While the different levels of threshold voltage are set between switches 3 and 6. The channel part of the switch 3 has the same conduction type as the substrate. Then the threshold value of the switch 3 is set higher than that of the switch 6 to prevent a blooming phenomenon.