Display device

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.

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.