IMAGING ELEMENT, ELECTRONIC APPLIANCE, METHOD FOR DRIVING IMAGING DEVICE, AND METHOD FOR DRIVING ELECTRONIC APPLIANCE

摘要

An imaging element which is capable of obtaining a piece of image data by performing light exposure plural times is provided. In addition, an imaging element which is capable of obtaining image data with little noise is provided. Furthermore, an imaging device with reduced power consumption is provided. In an imaging element including a pixel, the pixel includes a photodiode, a transistor including an oxide semiconductor layer, a diode, and a charge retention portion. The polarity of an electrode of the photodiode which is connected to the transistor is the same as that of an electrode of the diode which is connected to the transistor.

主权项

1. An imaging element comprising a pixel, the pixel comprising:
a photodiode; a first transistor including an oxide semiconductor layer; a diode; and a charge retention portion, wherein one of a source and a drain of the first transistor is electrically connected to a first electrode of the photodiode, wherein the other of the source and the drain of the first transistor is electrically connected to a first electrode of the diode, wherein a second electrode of the diode is electrically connected to the charge retention portion, and wherein a polarity of the first electrode of the photodiode is the same as a polarity of the first electrode of the diode.