Display Device and Method of Driving the Same

A method of driving a display device including a display panel comprising a sub-pixel connected to a data line and a reference line, and a data driver including a panel driving circuit and a panel sensing circuit, the panel driving circuit configured to supply a data voltage to the display panel through the data line, and the panel sensing circuit including an analog-to-digital converter (ADC) and the panel sensing circuit configured to sense the display panel through the reference line, the method comprising:

• turning on the display panel and displaying an image while the display panel is on;
• turning off the display panel;
• during a first sensing operation of the ADC while the display panel is off, supplying, by the panel sensing circuit, a first reference voltage to the display panel through the reference line and converting a voltage that is sensed through the reference line in response to the first reference voltage into a digital signal using the analog-to-digital converter without the panel driving circuit supplying the data voltage during the first sensing operation;
• and
• during a second sensing operation of an element included in the sub-pixel while the display panel is off, supplying, by the panel sensing circuit, a second reference voltage to the display panel through the reference line and supplying, by the panel driving circuit, the data voltage to the display panel through the data line.
• offset correction

A display device comprising:

• a display panel including a sub-pixel;
• a data line connected to the sub-pixel;
• a reference line connected to the sub-pixel;
• a panel driving circuit connected to the sub-pixel through the data line, the panel driving circuit configured to supply a data voltage to the display panel through the data line;
• and
• a panel sensing circuit connected to the sub-pixel through the reference line, the panel sensing circuit including an analog-to-digital converter (ADC), a first switch connected to a first reference voltage, a second switch connected to a second reference voltage, and a third switch configured to connect the ADC to the reference line,
• wherein during a first sensing operation of the ADC, the first switch is configured to turn on to supply the first reference voltage to the sub-pixel through the reference line while the second switch is off, and the ADC is configured to convert a voltage that is sensed through the reference line in response to the first reference voltage into a digital signal while the third switch is turned on without the panel driving circuit supplying the data voltage during the first sensing operation, and
• wherein during a second sensing operation of an element included in the sub-pixel, the second switch is turned on to supply a second reference voltage to the sub-pixel through the reference line while the first switch is off and the panel driving circuit supplies the data voltage to the display panel through the data line after the second reference voltage is supplied to the sub-pixel.