Patent ID: 7781738

Claim:
A digital X-ray image detector using an FED device, comprising: an upper substrate and a lower substrate, which are disposed to face each other and are sealed; an anode formed beneath the upper substrate; a photoconductive layer formed beneath the anode for forming electron-hole pairs using X-rays; a phosphor layer formed beneath the photoconductive layer such that the photoconductive layer is located between the anode and the phosphor layer, and configured to convert the X-rays into visible light; a cathode formed on the lower substrate; an emitter formed on the cathode for emitting electrons of the cathode; a gate electrode formed on an insulating layer that is provided around the emitter on the cathode, the gate electrode configured to apply an electron emission control signal to the emitter such that a signal of the electron-hole pairs formed in the photoconductive layer by the X-rays is transferred to the anode; and a data processing part configured to receive information about the electron-hole pairs formed in the photoconductive layer by the X-rays from the anode using the electrons emitted through the emitter, and then to convert the information about the electron-hole pairs to digital data through signal processing including filtering, amplification, storage, or A/D conversion.