Organic light emitting diode display device and method of driving the same

An organic light emitting diode display device comprising:

• a display panel comprising a pixel;
• a power supply configured to apply a voltage to the pixel;
• and
• a current measurement circuit connected to the pixel,
• wherein the pixel comprises a pixel circuit and an organic light emitting diode, the pixel circuit comprising a plurality of switching elements and one or more capacitors, and
• wherein the current measurement circuit comprises:
• a current integration circuit comprising an amplifier, the amplifier comprising a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the pixel circuit;
• a threshold voltage compensation circuit connected to the second input terminal of the amplifier;
• and
• an analog-to-digital converter connected to the output terminal of the amplifier,
• wherein the threshold voltage compensation circuit comprises a plurality of switches and a threshold voltage storage capacitor,
• wherein the plurality of switches of the threshold voltage compensation circuit comprise a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch,
• wherein one end of the second switch is connected to the organic light emitting diode and another end of the second switch is connected to the third switch, the threshold voltage storage capacitor, and the fifth switch,
• wherein one end of the third switch is connected to the second switch, the threshold voltage storage capacitor, and the fifth switch, and another end of the third switch is connected to the current integration circuit,
• wherein one end of the fourth switch is connected to the threshold voltage storage capacitor, the fifth switch, and the sixth switch, and another end of the fourth switch is connected to a ground potential source,
• wherein one end of the fifth switch is connected to the second switch, the third switch, and the threshold voltage storage capacitor, and another end of the fifth switch is connected to the fourth switch and the sixth switch,
• wherein one end of the sixth switch is connected to the fourth switch and the fifth switch, and another end of the sixth switch is connected to the power supply, and
• wherein one end of the threshold voltage storage capacitor is connected to the second switch, the third switch, and the fifth switch, and another end of the threshold voltage storage capacitor is connected to the fourth switch, the fifth switch, and the sixth switch.

A method of driving an organic light emitting diode display device, the method comprising:

• initializing a threshold voltage compensation circuit and a current integration circuit connected to the threshold voltage compensation circuit;
• storing a threshold voltage of an organic light emitting diode in the threshold voltage compensation circuit;
• and
• measuring a driving current of the organic light emitting diode by compensating a reference voltage with the stored threshold voltage of the organic light emitting diode,
• wherein the measuring of the driving current of the organic light emitting diode comprises:
• applying a sum of the reference voltage and the stored threshold voltage to the threshold voltage compensation circuit and the organic light emitting diode.

A method of driving an organic light emitting diode display device, the method comprising:

• initializing a threshold voltage compensation circuit and a current integration circuit connected to the threshold voltage compensation circuit;
• storing a threshold voltage of an organic light emitting diode in the threshold voltage compensation circuit;
• and
• measuring a driving current of the organic light emitting diode by compensating a reference voltage with the stored threshold voltage of the organic light emitting diode,
• wherein the measuring the driving current of the organic light emitting diode comprises:
• applying a sum of the reference voltage and the stored threshold voltage to the threshold voltage compensation circuit and the organic light emitting diode;
• and
• applying a current corresponding to the sum of the reference voltage and the stored threshold voltage through the current integration circuit and the organic light emitting diode.