X-ray detector and driving method thereof

1. An X-ray detector comprising a plurality of light sensing pixels, wherein each of the plurality of light sensing pixels comprises:

a photodiode which generates an electric detection signal corresponding to an emitted X-ray in an X-ray detection section;

a first switching device which transmits the electric detection signal to the outside; and

a second switching device which applies a voltage for making both ends of the photodiode equipotential to a node to which the photodiode and the first switching device are connected, in an idle section between two X-ray detection sections.

2. The X-ray detector of claim 1 , wherein the photodiode comprises a first electrode which is electrically connected to the first switching device and a second electrode which is electrically connected to a bias line which applies a bias voltage.

3. The X-ray detector of claim 1 , wherein the first switching device comprises a gate electrode which is electrically connected to a gate line, a first electrode which is electrically connected to the photodiode, and a second electrode which is electrically connected to a data line.

4. The X-ray detector of claim 2 , wherein the second switching device comprises a gate electrode which is electrically connected to a first voltage line which applies a first voltage for turning on the second switching device, a first electrode which is electrically connected to a second voltage line which applies a voltage having the same level as the bias voltage, and a second electrode which is electrically connected to the node.

5. The X-ray detector of claim 1 , wherein each of the plurality of light sensing pixels further comprises a third switching device which applies a voltage for maintaining a constant potential difference at both ends of the photodiode to the node, in the idle section between the two X-ray detection section.

6. The X-ray detector of claim 5 , wherein the third switching device comprises a gate electrode which is electrically connected to a third voltage line which applies a third voltage for turning on the third switching device, a first electrode which is electrically connected to a fourth voltage line which applies a fourth voltage for applying a reverse bias to the photodiode, and a second electrode which is electrically connected to the node.

7. An X-ray detector comprising:

a panel which comprises light sensing pixels arrayed in a matrix form, wherein each of the light sensing pixels comprises a photodiode which generates an electric detection signal corresponding to an emitted X-ray in an X-ray detection section and a first switching device which transmits the electric detection signal to the outside;

a gate driver which applies a gate signal for turning on the first switching device to a gate line; and

a second switching device which applies a voltage having the same level as a bias voltage applied to an other electrode of the photodiode, to a node to which an electrode of the photodiode and the first switching device are connected, in an idle section between two X-ray detection sections.

8. The X-ray detector of claim 7 , wherein the second switching device is installed in each of the light sensing pixels.

9. The X-ray detector of claim 7 , further comprising a third switching device which applies a voltage for maintaining a constant potential difference at both ends of the photodiode, to the node in the idle section between the two X-ray detection sections.

10. The X-ray detector of claim 9 , wherein the third switching device is installed in each of the light sensing pixels.

11. A method of driving an X-ray detector comprising a plurality of light sensing pixels, each of which comprises a photodiode for generating an electric detection signal corresponding to an emitted X-ray and a first switching device for transmitting the electric detection signal to the outside, comprising:

turning on the first switching device to transmit the electric detection signal to the outside in an X-ray detection section; and

applying a voltage for making both ends of the photodiode equipotential to a node to which the photodiode and the first switching device are connected, in an idle section between two X-ray detection sections.

12. The method of claim 11 , further comprising applying a voltage for maintaining a constant potential difference at the both ends of the photodiode, to the node in the idle section between the two X-ray detection sections.

13. The method of claim 11 , wherein the photodiode comprises a first electrode which is electrically connected to the first switching device and a second electrode which is electrically connected to a bias line which applies a bias voltage.

14. The method of claim 11 , wherein the first switching device comprises a gate electrode which is electrically connected to a gate line, a first electrode which is electrically connected to the photodiode, and a second electrode which is electrically connected to a data line.

15. The method of claim 13 , wherein the voltage for making the both ends of the photodiode equipotential is applied by a second switching device which comprises a first electrode which is electrically connected to a second voltage line which applies a voltage having the same level as the bias voltage and a second electrode which is electrically connected to the node.

16. The method of claim 12 , wherein the voltage for maintaining the constant potential different at the both ends of the photodiode is applied by a third switching device which comprises a first electrode which is electrically connected to a fourth voltage line which applies a fourth voltage for applying a reverse bias to the photodiode and a second electrode which is electrically connected to the node.