| 摘要 |
According to one embodiment, an AD conversion circuit of a single slope type comprises: a first comparator which compares a potential level of a first slope voltage with a potential level of an analog signal from a pixel; a second comparator which compares a potential level of a second slope voltage with the potential level of an analog signal from the pixel; a counter which is configured to count number of clocks, in a state where the potential level of the first slope voltage and the potential level of the second slope voltage concurrently change, until an output signal of either one of the first comparator and the second comparator is inverted; a reference counter which is configured to constantly output a full count value; and a generation circuit which is configured to generate and output a digital value corresponding to a count value of the counter when an output signal of the first comparator is inverted, and to generate and output a digital value corresponding to a value obtained by subtracting a count value of the counter from the full count value of the reference counter when an output signal of the second comparator is inverted. |
