Display device and method of driving display device

1 . A display device, comprising:

a display panel including a plurality of pixels, each of the plurality of pixels including a plurality of stages electrically connected in series, each of the plurality of stages including a plurality of light emitting elements;

a storage component that stores location information of at least one defective pixel having a defect in the plurality of stages among the plurality of pixels;

a compensation component that generates compensated data by compensating for a grayscale value in image data of a normal pixel among the plurality of pixels based on a first degradation coefficient, and by compensating for a grayscale value of the at least one defective pixel corresponding to the location information based on a second degradation coefficient different from the first degradation coefficient; and

a data driver that generates data voltages based on the compensated data, and provide the data voltages to the plurality of pixels,

wherein the compensation component generates the compensated data by:

calculating a first compensated grayscale value of the normal pixel among the plurality of pixels based on the first degradation coefficient and adding the first compensated grayscale value to the grayscale value in the image data of the normal pixel to compensate for the grayscale value of the normal pixel based on a difference between a target luminance and a first degraded luminance; and

calculating a second compensated grayscale value of the at least one defective pixel corresponding to the location information based on the second degradation coefficient different from the first degradation coefficient and adding the second compensated grayscale value to the grayscale value in the image data of the at least one defective pixel to compensate for the grayscale value of the at least one defective pixel based on a difference between the target luminance and a second degraded luminance.

2 . The display device according to claim 1 , wherein

each of the first degradation coefficient and the second degradation coefficient comprises a coefficient in an equation defining a luminance of a corresponding pixel that degrades based on a driving time of the corresponding pixel, and

a change in the luminance increases as the coefficient increases.

3 . The display device according to claim 2 , wherein the second degradation coefficient of the at least one defective pixel is greater than the first degradation coefficient of the normal pixel.

4 . The display device according to claim 2 , wherein each of the first degradation coefficient and the second degradation coefficient includes a grayscale coefficient, a temperature coefficient, a frequency coefficient, and an emission duty coefficient that respectively represent a grayscale value, a driving temperature, a driving frequency, and a change in the luminance according to an emission duty of the plurality of pixels.

5 . The display device according to claim 1 , wherein

each of the plurality of pixels further includes an identical pixel circuit that provides driving current to the plurality of stages,

a number of stages included in the plurality of stages for each of the plurality of pixels are identical to each other, and

each of the plurality of light emitting elements of each of the plurality of pixels have an identical size and emit light of an identical color.

6 . The display device according to claim 1 , wherein

a stage of the plurality of stages of the at least one defective pixel has a short-circuit defect or a portion that has been repaired due to the short-circuit defect, and

at least one of the plurality of light emitting elements in the stage that includes the short-circuit defect do not emit light, and the plurality of light emitting elements in each of another ones of the plurality of stages in the at least one defective pixel also emit light.

7 . The display device according to claim 1 , wherein

each of the plurality of pixels is composed of two stages, and

the storage component is absent of information of the normal pixel and is absent of information about a number of defective stages in each of the at least one defective pixel.

8 . The display device according to claim 1 , wherein

each of the plurality of pixels includes at least three stages,

the at least one defective pixel includes a first defective pixel that is composed of one defective stage having at least one defective light emitting element, and a second defective pixel that is composed of two defective stages that each include at least one defective light emitting element, and

the storage component stores location information of each of the first and the second defective pixels and information about a number of defective stages within each of the first and the second defective pixels.

9 . The display device according to claim 8 , wherein the compensation component compensates for the grayscale value of the first defective pixel based on the second degradation coefficient, and compensates for the grayscale value of the second defective pixel based on a third degradation coefficient different from the first and the second degradation coefficients.

10 . The display device according to claim 1 , wherein

the second compensated grayscale value is greater than the first compensated grayscale value under conditions of an identical driving time and a same grayscale value in the image data.

11 . The display device according to claim 1 , wherein the compensation component comprises:

an accumulation circuit that accumulates a grayscale value in the compensated data and calculates a driving time;

a memory device that stores the driving time; and

a compensation circuit that calculates a compensation value of each of the plurality of pixels based on the driving time and the first and the second degradation coefficients, and compensates for the grayscale value in the image data using the compensation value.

12 . The display device according to claim 1 , wherein each of the plurality of pixels further includes:

a first transistor electrically connected between a first power line and a second power line;

a second transistor electrically connected between a data line and a gate electrode of the first transistor;

a third transistor electrically connected between a non-gate electrode of the first transistor and a sensing line; and

a storage capacitor electrically connected between the gate electrode and the non-gate electrode of the first transistor, and

wherein the plurality of stages are electrically connected between the non-gate electrode of the first transistor and the second power line.

13 . A method, comprising:

providing a display device that includes a plurality of pixels, each of the plurality of pixels including a plurality of stages electrically connected in series, each of the plurality of stages including a plurality of light emitting elements;

detecting at least one defective pixel having a defect in the plurality of stages among the plurality of pixels by applying a driving voltage to the display device;

acquiring a first degradation coefficient of a normal pixel and a second degradation coefficient of the at least one defective pixel by the applying of the driving voltage to the display device for a reference time;

storing location information of the at least one defective pixel and the first and the second degradation coefficients in a storage component of the display device; and

generating compensated data by:

calculating a first compensated grayscale value of the normal pixel among the plurality of pixels based on the first degradation coefficient and adding the first compensated grayscale value to a grayscale value in image data of the normal pixel to compensate for the grayscale value of the normal pixel based on a difference between a target luminance and a first degraded luminance; and

calculating a second compensated grayscale value of the at least one defective pixel corresponding to the location information based on the second degradation coefficient different from the first degradation coefficient and adding the second compensated grayscale value to a grayscale value in the image data of the at least one defective pixel to compensate for the grayscale value of the at least one defective pixel based on a difference between the target luminance and a second degraded luminance.

14 . The method according to claim 13 , wherein

the first degradation coefficient comprises a coefficient in an equation defining a luminance of the normal pixel that degrades based on a driving time of the normal pixel,

the second degradation coefficient comprises a coefficient in an equation defining a luminance of the at least one defective pixel that degrades based on a driving time of the at least one defective pixel,

a change in the luminance increases as any of the first and the second degradation coefficients increase, and

the second degradation coefficient of the at least one defective pixel is greater than the first degradation coefficient of the normal pixel.

15 . The method according to claim 13 , wherein

each of the plurality of pixels further includes an identical pixel circuit that provides a driving current to the plurality of stages,

each of the plurality of pixels include a same number of stages, and

each of the plurality of light emitting elements of each of the plurality of pixels have an identical size and emit light of an identical color.

16 . The method according to claim 13 , wherein the detecting of the at least one defective pixel comprises:

capturing an image of the display device and acquiring a thermal infrared image;

detecting a defective stage having the at least one defective pixel among the plurality of stages from the thermal infrared image; and

acquiring the location information of the at least one defective pixel based on the defective stage.

17 . The method according to claim 13 , wherein

each of the plurality of pixels is composed of two stages, and

the detecting of the at least one defective pixel comprises acquiring only the location information of the at least one defective pixel and is absent acquiring location information of the normal pixel and is absent of acquiring information about a number of defective stages.

18 . The method according to claim 13 , wherein

each of the plurality of pixels includes at least three stages,

the at least one defective pixel comprises a first defective pixel composed of one defective stage having at least one defective light emitting element, and a second defective pixel including two defective stages each having at least one defective light emitting element, and

the detecting of the at least one defective pixel comprises acquiring location information of each of the first and the second defective pixels and acquiring information about a number of defective stages.

19 . The method according to claim 13 , wherein

each of the first degradation coefficient and the second degradation coefficient includes a grayscale coefficient, a temperature coefficient, a frequency coefficient, and an emission duty coefficient that respectively represent a grayscale value, a driving temperature, a driving frequency, and a change in luminance according to an emission duty of the pixels, and

the acquiring of the first and the second degradation coefficients each comprises:

acquiring the grayscale coefficient while changing the grayscale value;

acquiring the temperature coefficient while changing the driving temperature;

acquiring the frequency coefficient while changing the driving frequency; and

acquiring the emission duty coefficient while changing the emission duty.

20 . The method according to claim 13 , further comprising:

generating data voltages based on the compensated data; and

providing the data voltages to the plurality of pixels.