| 摘要 |
PROBLEM TO BE SOLVED: To improve the accuracy of AD conversion.SOLUTION: When a signal output from a pixel is higher than a comparison level, the signal output from the pixel is converted into a digital signal in a first period using a first reference signal, and when the signal output from the pixel is lower than the comparison level, the signal output from the pixel is converted into a digital signal in a second period longer than the first period using a second reference signal. |
