Patent ID: 8324624

Claim:
A thin film transistor (TFT) array substrate for an X-ray detector comprising: a substrate; a gate line formed on the substrate; a data line crossing the gate line; a thin film transistor including a gate electrode, a source electrode, and a drain electrode; a first electrode connected to the drain electrode; a passivation layer formed over the gate line, the data line, the thin film transistor and the first electrode; a photoconductor formed over the passivation layer and connected to the first electrode; and a second electrode formed on the photoconductor, wherein the photoconductor comprises a first silicon layer with n-type impurities, an undoped second silicon layer, and a third silicon layer with p-type impurities, wherein the first, second and third silicon layers are sequentially disposed, and wherein a bottom surface of the undoped second silicon layer contacts the passivation layer.