Display device and method of driving the same
A display device includes a display panel including a plurality of pixels, a sensing circuit to measure a sensing current value of each of the pixels during a frame period, wherein the frame period includes an active period and a blank period following the active period, and a driving controller to calculate a deterioration weight based on the sensing current value and a reference current value, and to generate output image data by applying the deterioration weight to input image data.
1. A display device comprising:
a display panel comprising a plurality of pixels;
a sensing circuit to measure a sensing current value of each of the pixels during a blank period, wherein a frame period comprises an active period and the blank period following the active period, wherein the sensing circuit is to measure the sensing current value based on an initialization voltage supplied through a sensing line to the pixels during the active period and a first blank period of the blank period and a reference voltage supplied through the sensing line to the pixels during a second blank period of the blank period, the first period being adjacent the active period, and the initialization voltage being different from the reference voltage;
a compensator to calculate a deterioration weight based on the sensing current value and a reference current value; and
a controller to generate output image data by applying the deterioration weight to input image data,
wherein each of the pixels further comprises:
a first transistor comprising a control terminal connected to a first node, a first terminal connected to a first power source, and a second terminal connected to a second node;
a second transistor comprising a control terminal connected to a first scan line, a first terminal connected to a data line, and a second terminal connected to the first node;
a third transistor comprising a control terminal connected to a second scan line, a first terminal connected to the second node, and a second terminal connected to the sensing line; and
an organic light emitting diode comprising a first terminal connected to the second node and a second terminal connected to a second power source,
wherein the blank period comprises the first blank period and the second blank period following the first blank period, and
wherein a turn-on voltage for turning on the second transistor is provided to the first scan line during the first blank period, and a turn-off voltage for turning off the second transistor is provided to the first scan line during the second blank period.
2. The display device of claim 1 , wherein the compensator comprises:
a block sensing current value calculator to calculate a block sensing current value of a pixel block based on the sensing current values, wherein the pixel block comprises pixels from among the plurality of pixels.
3. The display device of claim 2 , wherein the block sensing current value is an average value of the sensing current values of the pixels in the pixel block.
4. The display device of claim 2 , wherein the block sensing current value is a maximum sensing current value from among the sensing current values of the pixels in the pixel block.
5. The display device of claim 2 , wherein the compensator comprises:
a deterioration weight calculator to calculate a block deterioration weight of the pixel block based on the block sensing current value and the reference current value.
6. The display device of claim 5 , wherein the controller is to generate the output image data by applying the block deterioration weight to the input image data.
7. The display device of claim 6 , wherein the pixel block has a same emission luminance during a first frame period and a second frame period following the first frame period, and
wherein the block deterioration weight of the second frame period is greater than the block deterioration weight of the first frame period.
8. The display device of claim 1 , wherein the deterioration weight is calculated based on a ratio of the sensing current value and the reference current value.
9. The display device of claim 1 , wherein a turn-on voltage for turning on the third transistor is provided to the second scan line during the blank period.
10. The display device of claim 1 , wherein the initialization voltage is provided to the sensing line during the first blank period, and the reference voltage is provided to the sensing line during the second blank period.
11. The display device of claim 1 , wherein the compensator is to calculate a pixel deterioration weight of each of the pixels based on the sensing current value of each of the pixels and the reference current value.
12. The display device of claim 11 , wherein the controller is to generate the output image data by applying the pixel deterioration weight to the input image data.