| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of driving a solid-state image sensor capable of achieving a wide dynamic range without a reduction in sensitivity and an increase in horizontal drive frequency. SOLUTION: The solid-state image sensor is equipped with a photosensor unit PS arranged in a matrix, a vertical transfer unit SR<SB>V</SB>and a horizontal transfer unit SR<SB>H</SB>which read out signal charge to transfer, and characterized by the fact that a one field period is divided into two so as to contain a first exposure time and a second exposure time shorter than the first exposure time. A first signal charge C1 is stored in the photosensor unit PS in the first exposure time and transferred to the vertical transfer unit SR<SB>V</SB>, a second signal charge C2 is stored in the photosensor PS in a second exposure time and transferred to the vertical transfer unit SR<SB>V</SB>, the first signal charge C1 and the second signal charge C2 produced in the same photosensor unit PS are mixed together into the mixed signal charge, and the mixed signal charge is transferred in the vertical direction through the vertical transfer unit SR<SB>V</SB>and furthermore transferred in the horizontal direction through the horizontal transfer unit SV<SB>H</SB>. COPYRIGHT: (C)2007,JPO&INPIT |
