Patent ID: 8907339

Claim:
An X-ray detector, comprising: a thin film transistor substrate, which comprises a substrate, a plurality of data lines and a plurality of gate lines intersected to define a plurality of pixel regions, wherein each of the pixel regions comprises at least one thin film transistor, and the thin film transistor comprises: a gate electrode, disposed on the substrate; a gate insulating layer, disposed on the gate electrode; a semiconductor layer, disposed on the gate insulating layer, wherein a portion of the semiconductor layer covers the gate electrode; an etching stop layer, disposed on the semiconductor layer; a source electrode and a drain electrode, respectively disposed on the etching stop layer; a passivation layer, covering the source electrode and the drain electrode; and a photo-diode array layer, having plurality of photo-diodes electrically connected to the corresponding thin film transistor; wherein the source electrode is electrically connected to the semiconductor layer through a first conductive via hole having a first base portion at the semiconductor layer, the drain electrode is electrically connected to the semiconductor layer through a second conductive via hole having a second base portion at the semiconductor layer, and at least one of projection areas of the first base portion and the second base portion vertically projected on the substrate has a non-overlapping region beyond a projection area of the gate electrode vertically projected on the substrate.