A panel to detect X-rays includes a plurality of signal lines, a plurality of gate lines, and a plurality of cells in areas adjacent intersections of respective ones of the gate and control lines. A first area includes a first cell having a driving circuit, and a second area includes a second cell which omits a driving circuit. Data lines connected to respective ones of the cells carry signals from which an X-ray image is generated. The second cell may be located in a dummy cell area of the panel.