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AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorTakayuki IKEDA
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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.
An electronic appliance comprising:
An imaging device comprising:
A method for driving an electronic appliance comprising an element configured to generate charge when light is incident on the element, a first node electrically connected to the element, a first transistor wherein one of a source and a drain of the first transistor is electrically connected to the first node, a second node electrically connected to the other of the source and the drain of the first transistor, and a signal processing circuit, the method comprising the step of:
Dependencies are inferred from the claim text.