The present invention relates to a flat panel X-ray detector, which comprises a thin film transistor (TFT) substrate a photoelectric detecting layer, which is electrically connected with the TFT substrate, wherein the photoelectric detecting layer comprises a plurality of photo detecting elements and a plurality of light absorption elements, and light absorption elements are disposed between spaces of photo detectors a scintillator, which is disposed on the photoelectric detecting layer and a reflective layer, which is disposed on the scintillator.本發明係有關於一種X光平板偵測裝置,包括:一薄膜電晶體基板;一光電感測層,係與薄膜電晶體基板電性連接,其中此光電感測層係包含複數個光電感測元件以及複數個吸光元件,且該些吸光元件係形成於該些光電感測元件彼此間之間隙;一閃爍層,係位於光電感測層上;以及一反射層,係設置於閃爍層上。2‧‧‧薄膜電晶體基板21‧‧‧金屬導線3‧‧‧光電感測層31‧‧‧光電感測元件32‧‧‧吸光元件4‧‧‧閃爍層41‧‧‧第一側42‧‧‧第二側5‧‧‧反射層6‧‧‧碳纖維層
