Display device and method of driving same

A method of controlling a display device, the method comprising:

• applying, by a sensing circuit included in the display device, a first reference voltage to a reference line connected to a subpixel included in a display panel of the display device;
• acquiring, by the sensing circuit, a first sensing voltage charged in the reference line as a first sampling value during a period when a switching transistor and a sensing transistor are turned on, and acquiring the first sensing voltage charged in the reference line as a second sampling value during a period when the switching transistor and the sensing transistor are turned off;
• and
• determining, by a timing controller in the display device, that the display device has a defect based on a first difference value between the first sampling value and the second sampling value.

A display device comprising:

• a display panel including a subpixel having a switching transistor connected to a data line and a sensing transistor connected to a reference line;
• and
• a controller configured to:
• in response to applying a first reference voltage to the subpixel through the reference line during a first sensing period, sense a first sensing voltage charged in the reference line when the switching transistor and the sensing transistor are turned on and sense a second sensing voltage charged in the reference line when the switching transistor and the sensing transistor are turned off, and
• determine that the subpixel is a defect candidate based on a difference between the first sensing voltage and the second sensing voltage.