| 摘要 |
PROBLEM TO BE SOLVED: To achieve a reduction in size, power consumption, and a cost, an increase in the number of pixels and the like of an image sensor for conducting various arithmetic processes employing an imaging signal in addition to an ordinary image output function. SOLUTION: An arithmetic circuit, which is retained for each pixel in a conventional image sensor, is shared by each column. Signal processing circuits of different constitution are provided on signal transmission paths in an upward direction and a downward direction of a vertical signal line 54 for extracting an image signal from each pixel, whereby image output processing and arithmetic processing are performed completely separately by the different circuit blocks. Thus, image quality of an actual image is improved and optimum design for arithmetic processing is made possible. Specifically, an I-V converter circuit unit 44, a CDS circuit unit 45 and the like are provided on the image output side. A current mirror circuit unit 46, an analog memory array unit 47, a comparator unit 50, a bias circuit unit 51, a data latch unit 52, an output data bus unit 53 and the like are provided on the arithmetic processing side. COPYRIGHT: (C)2007,JPO&INPIT |
