Patent ID: 8633446

Claim:
A method of obtaining an X-ray image using an X-ray detector comprising an array of light sensing pixels each light sensing pixel including a switching device, the method comprising: (a) during an offset adjustment period of a first frame, performing a gate scan operation a predetermined number of times, wherein the predetermined number is at least two and wherein each gate scan operation includes sequentially outputting first gate signals to a plurality of gate lines to turn on the switching devices of the light sensing pixels; (b) during an offset read out of the first frame, sequentially outputting second gate signals to the plurality of gate lines to turn on the switching devices of the light sensing pixels after a first window time, and reading electrical signals output by the switching devices; (c) generating a first offset image based on the electrical signals in (b); (d) repeating (a)-(c) for a second frame to generate a second offset image; (e) generating a third offset image based on the first offset image and the second offset image; and (f) correcting an X-ray image detected after the second frame based on the third offset image, wherein (f) includes subtracting the third offset image from the X-ray image.