Display device

1. A display device, comprising:

a display panel having a plurality of pixels connected to a data line and a sensing line;

a source drive IC configured to provide a data voltage to a pixel through the data line and including a sensing block obtaining sensing data related to driving characteristics of the pixel using a signal input through the sensing line;

a reference voltage source providing a reference voltage to the sensing block; and

a test power source providing a test voltage or a test current to the sensing block,

wherein the source drive IC obtains calibration data related to characteristic of the sensing block by using the test voltage or the test current in a state that the switch disconnects the pixel and the sensing block,

wherein the source drive IC performs a calibrating operation for obtaining the calibration data in a display driving period during which image is displayed on the display panel by providing the data voltage,

wherein the sensing block performs a sensing operation to obtain the sensing data during a sensing operation period by using the test voltage or the test current in a state that the switch connects the pixel and the sensing block in a vertical blank period or a power off sequence period except for the display driving period, and

wherein the sensing block includes:

a first switch connecting the reference voltage source and the sensing line during the display driving period and disconnecting the reference voltage source and the sensing line during the sensing operation period,

a second switch connecting the test power source and the sensing block to perform a calibrating operation during the display driving period and disconnecting the test power source and the sensing block during the sensing operation period, and

a third switch connecting the sensing block and the sensing line during the sensing operation period and disconnecting the sensing block and the sensing line during the display driving period.

2. The display device of claim 1 , wherein the pixel is supplied with the reference voltage through the sensing line by the reference voltage source separate from the test power source during a part of the display driving period.

3. The display device of claim 1 , wherein the third switch connects the pixel and the sensing block and the sensing block obtains the sensing data by using a voltage or a current of the sensing line during the vertical blank period or the power off sequence period except for the display driving period.

4. The display device of claim 1 , wherein the sensing block includes a sampling unit sampling and holding a voltage of the sensing line and an analog-to-digital converter converting the sampled voltage into a digital value when the power source provides the test voltage to the sensing block.

5. The display device of claim 1 , wherein the sensing block includes an integrator integrating a current, a sampling unit sampling and holding a voltage output from the integrator and an analog-to-digital converter converting the sampled value into a digital value when the power source provides the test current to the sensing block.

6. The display device of claim 1 , further comprising a controller configured to compensate input image data based on the calibration data and the sensing data and provide the compensated data to the source drive IC.

7. A method for calibrating data in a display device having a sensing block with first, second and third switches, comprising:

displaying an image by applying a data voltage to a plurality of pixels connected to a data line and a sensing line in a display driving period;

obtaining calibration data related to characteristic of a sensing block which obtains sensing data related to driving characteristics of a pixel by providing a test voltage or a test current to the sensing block, while disconnecting a connection between the pixel and the sensing block during the display driving period;

obtaining the sensing data by using a voltage or a current of the sensing line while connecting the pixel and the sensing block during a vertical blank period or a power off sequence period except for the display driving period; and

compensating for input image data based on the calibration data and the sensing data,

wherein the first switch connects a reference voltage source and the sensing line during the display driving period and disconnects the reference voltage source and the sensing line during the sensing operation period,

the second switch connects a test power source and the sensing block to perform a calibrating operation during the display driving period and disconnects the test power source and the sensing block during the sensing operation period, and

the third switch connects the sensing block and the sensing line during the sensing operation period and disconnects the sensing block and the sensing line during the display driving period.

8. The method of claim 7 , wherein the displaying image comprises providing a reference voltage separate from the test voltage to the pixel through the sensing line during a part of the display driving period.

9. A display device, comprising:

a display panel having a plurality of pixels connected to a data line and a sensing line; and

a source drive IC providing a data voltage to a pixel through the data line and including a sensing block obtaining sensing data related to driving characteristics of the pixel using a signal input through the sensing line; and

wherein the source drive IC performs a calibrating operation obtaining calibration data related to characteristic of the sensing block during a display driving period for which an image is displayed on the display panel by providing the data voltage and compensates for a characteristic change of the sensing block during the display driving period in real time,

wherein the sensing block performs a sensing operation to obtain the sensing data by using a voltage or a current of the sensing line in a vertical blank period or a power off sequence period except for the display driving period, and

wherein the sensing block includes:

a first switch connecting a reference voltage source and the sensing line during the display driving period and disconnecting the reference voltage source and the sensing line during the sensing operation period,

a second switch connecting a test power source and the sensing block to perform a calibrating operation during the display driving period and disconnecting the test power source and the sensing block during the sensing operation period, and

a third switch connecting the sensing block and the sensing line during the sensing operation period and disconnecting the sensing block and the sensing line during the display driving period.

10. The display device of claim 9 , wherein the test power source provides a test voltage or a test current to the sensing block.

11. The display device of claim 10 , wherein the pixel is supplied with a reference voltage through the sensing line by the reference voltage source separate from the test power source during a part of the display driving period.

12. The display device of claim 9 , wherein the third switch controlling a connection of the sensing line between the pixel and the sensing block.

13. The display device of claim 12 , wherein the third switch connects the pixel and the sensing block and the sensing block obtains the sensing data by using a voltage or a current of the sensing line during the vertical blank period or the power off sequence period except for the display driving period.

14. The display device of claim 9 , wherein the calibrating operation is omitted from a power off sequence to reduce a time required for the power-off sequence.

15. The display device of claim 9 , wherein the sensing block includes a sampling unit sampling and holding a voltage of the sensing line and an analog-to-digital converter converting the sampled voltage into a digital value when the power source provides the test voltage to the sensing block.

16. The display device of claim 9 , wherein the sensing block includes an integrator integrating a current, a sampling unit sampling and holding a voltage output from the integrator and an analog-to-digital converter converting the sampled value into a digital value when the power source provides the test current to the sensing block.

17. The display device of claim 9 , further comprising a controller configured to compensate input image data based on the calibration data and the sensing data and provide the compensated data to the source drive IC.