Display device and method of driving the same
A display device includes a sensor, a timing controller, and a data driver. The sensor senses characteristic values of an element included in a pixel of the display device using input initialization and data voltages in a sensing period of one frame period. The timing controller calculates compensation data voltage using the characteristic values, and calculate adjusted initialization and data voltages in the sensing period by using the compensation data voltage. The data driver output the adjusted initialization and data voltages to the pixel during the sensing period in response to a control signal output from the timing controller.
1. A display device comprising:
a pixel;
a sensor to sense characteristic values of a circuit element of the pixel in a sensing period of a frame period; and
a controller to adjust an initialization voltage supplied to the pixel based on the characteristic values and a margin value of the initialization voltage, wherein after a first time is elapsed, the initialization voltage supplied to the pixel in the sensing period is set to a first voltage value, after a second time different from the first time is elapsed, the initialization voltage supplied to the pixel is set to a second voltage value greater than the first voltage value.
2. The display device of claim 1 , wherein: the controller is configured to further adjust a data voltage based on the characteristic values of the circuit element of the pixel; and after the first time is elapsed, the data voltage supplied to the pixel during the sensing period is set to a third voltage value, after the second time is elapsed, the data voltage supplied to the pixel is set to a fourth voltage value different from the third voltage value, the third voltage value being higher than the fourth voltage value.
3. The display device of claim 1 , wherein the frame period comprises an active period and a blank period, and the blank period comprises the sensing period.
4. The display device of claim 2 , wherein:
the initialization voltage having the first voltage value is supplied to the pixel in the sensing period of the frame period; and
the initialization voltage having the second voltage value is supplied to the pixel in the active period of another frame period following the frame period.
5. The display device of claim 1 , wherein the pixel comprises:
a light emitting diode connected to a first node;
a first transistor connected between a first power source and the first node, and having a gate electrode connected to a second node; and
a second transistor connected between a data line and the second node, and wherein the initialization voltage is supplied to the first node, and the data voltage is supplied to the second node through the data line and the second transistor.
6. The display device of claim 5 , wherein the characteristic values include a threshold voltage of a first transistor, a mobility of the first transistor, and a characteristic value of the light emitting diode.
7. The display device of claim 6 , wherein the controller is configured to support a plurality of sensing modes including a first sensing mode to sense the threshold voltage of the first transistor, a second sensing mode to sense the mobility of the first transistor, and a third sensing mode to sense the characteristic value of the light emitting diode.
8. The display device of claim 1 , wherein the controller is configured to calculate a compensation data voltage using the characteristic values, and adjust the initialization voltage based on the compensation data voltage.
9. The display device of claim 8 , wherein the initialization voltage is adjusted based on the compensation data voltage and the margin value associated with a mode of the controller.
10. The display device of claim 8 , wherein the initialization voltage decreases as the compensation data voltage increases.
11. The display device of claim 1 , further comprising a data driver to output the initialization voltage and the data voltage in response to control signals of the controller.
12. A display device comprising:
a pixel;
a sensor to sense characteristic values of a circuit element of the pixel by using an initialization voltage and a data voltage supplied to the pixel in a sensing period of a frame period; and
a controller to adjust the initialization voltage based on the characteristic values, wherein after a first time is elapsed, the initialization voltage supplied to the pixel in the sensing period is set to a first voltage value, after a second time different from the first time is elapsed, the initialization voltage supplied to the pixel is set to a second voltage value different from the first voltage value, the first voltage value being lower than the second voltage value,
wherein the controller is configured to calculate a compensation data voltage using the characteristic values, and adjust the initialization voltage based on the compensation data voltage, and
wherein the initialization voltage is adjusted based on the compensation data voltage and a margin value associated with a mode of the controller.