Patent ID: 8680472

Claim:
A radiation detecting apparatus comprising: a plurality of pixels arranged in a matrix, each pixel having a conversion element for converting incident radiation into an electric signal, a first switch element having a gate electrode, a first main electrode, and a second main electrode connected to said conversion element, and a second switch element having a gate electrode, and a semiconductor layer having a channel portion arranged between a first region and a second region, wherein said conversion element is arranged to cover said first and second switch elements; a first signal line electrically connected to said first main electrode of said first switch element of each pixel in a pixel column; a second signal line electrically connected to said first region of said second switch element of each pixel in said pixel column; a drive wiring electrically connected to said gate electrode of said first switch element and said gate electrode of said second switch element of each pixel in a pixel row; and a differential means electrically connected to said first signal line and said second signal line for outputting a signal corresponding to a difference between outputs from said first and second switch elements, wherein said second region of said second switch element of each pixel is left floating by omission of electrical connection to said second region or electrically connected to a wiring to which a fixed potential is supplied.