IMAGING DEVICE

摘要

An imaging device which is highly stable to irradiation with radiations such as X-rays and can inhibit a decrease in electrical characteristics is provided. The imaging device obtains an image using radiations such as X-rays and includes pixel circuits which are arranged in a matrix and which a scintillator overlaps. Each of the pixel circuits includes a switching transistor whose off-state current is extremely low and a light-receiving element. A shielding layer formed using a metal material and the like overlaps the transistor and the light-receiving element. With the structure, an imaging device which is highly stable to irradiation with radiations such as X-rays and can inhibit a decrease in electrical characteristics can be provided.

主权项

1. An imaging device comprising:
a pixel circuit; a scintillator overlapping the pixel circuit, configured to emit light in response to radiation from a radiation source; and a shielding layer, wherein the pixel circuit includes a light-receiving element and a transistor electrically connected to the light-receiving element, wherein the transistor comprises a channel formation region which comprises an oxide semiconductor, and wherein the shielding layer and the transistor overlap each other to prevent the transistor from being exposed to the radiation.