Driving controller, display device, and method of driving the same
A display device includes an on-duty determiner which determines an on-duty period of an emission signal, based on a number of at least one cycle of a current frame, a first compensation value determiner which determines a first compensation value of a bias voltage according to a variation of the on-duty period, a second compensation value determiner which determines a second compensation value of the bias voltage, based on a driving frequency of a previous frame, and a third compensation value determiner which determines a third compensation value, based on the first compensation value and the second compensation value.
1 . A method of driving a display device, the method comprising:
determining an on-duty period of an emission signal, based on a number of at least one cycle of each frame;
determining a first compensation value of a bias voltage according to a variation of the on-duty period;
determining a second compensation value of the bias voltage, based on a driving frequency of a previous frame; and
determining a third compensation value, based on the first compensation value and the second compensation value.
2 . The method of claim 1 , further comprising comparing a sum of a maximum value of the first compensation value and a maximum value of the second compensation value with a maximum output voltage of a power supply, and outputting a comparison result,
wherein the determining of the third compensation value includes
determining the third compensation value, based on the comparison result.
3 . The method of claim 2 , wherein, the determining of the third compensation value includes determining the second compensation value as the third compensation value, when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is greater than or equal to the maximum output voltage of the power supply.
4 . The method of claim 2 , wherein the determining of the on-duty period of an emission signal includes:
maintaining the on-duty period when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is greater than or equal to the maximum output voltage of the power supply and when a difference between the driving frequency of the previous frame and a driving frequency of the current frame is higher than a reference frequency; and
changing the on-duty period when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is smaller than the maximum output voltage of the power supply and when the difference between the driving frequency of the previous frame and the driving frequency of the current frame is higher than the reference frequency.
5 . The method of claim 2 , wherein the determining of the third compensation value includes
determining, as the third compensation value, a sum of a product of the first compensation value and a first factor and a product of the second compensation value and a second factor, when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is greater than or equal to the maximum output voltage of the power supply, and
wherein a sum of a product of the maximum value of the first compensation value and the first factor and a product of the maximum value of the second compensation value and the second factor is smaller than the maximum output voltage of the power supply.
6 . The method of claim 2 , wherein the determining of the third compensation value includes
determining, as the third compensation value, a sum of the first compensation value and the second compensation value, when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is smaller than the maximum output voltage of the power supply.
7 . The method of claim 2 , wherein the determining of the third compensation value includes
determining, as the third compensation value, a sum of a product of the first compensation value and a first factor and a product of the second compensation value and a second factor, when the sum of the maximum value of the first compensation value and the maximum value of the second compensation value is smaller than the maximum output voltage of the power supply.
8 . The method of claim 1 , wherein the on-duty period becomes larger as the number of the at least one cycle becomes larger.
9 . The method of claim 1 , wherein the determining an on-duty period of an emission signal includes determining the on-duty period by a first lookup table including the variation of the on-duty period according to the number of the at least one cycle.
10 . The method of claim 1 , wherein the first compensation value becomes larger as the variation of the on-duty period becomes larger.
11 . The method of claim 1 , wherein the determining of the first compensation value of a bias voltage includes determining the first compensation value by a second lookup table including the first compensation value according to the variation of the on-duty period.
12 . The method of claim 1 , wherein the second compensation value becomes larger as the driving frequency of the previous frame becomes higher.
13 . The method of claim 1 , wherein the second compensation value becomes larger as a difference between the driving frequency of the previous frame and a driving frequency of the current frame becomes larger.
14 . The method of claim 1 , wherein the determining of the second compensation value of the bias voltage includes determining the second compensation value by a third lookup table including the second compensation value according to the driving frequency of the previous frame and the number of the at least one cycle.
15 . The method of claim 1 , wherein the bias voltage is determined as the third compensation value.
16 . The method of claim 1 , wherein the determining of the second compensation value of the bias voltage includes determining the second compensation value by a third lookup table including the second compensation value according to the driving frequency of the previous frame and the number of the at least one cycle, and
wherein the second compensation value included in the third lookup table is updated to the third compensation value.
17 . A electronic device comprising:
a display panel including sub-pixels;
a data driver which provides data voltages to the sub-pixels;
a gate driver which provides gate signals to the sub-pixels;
an emission driver which provides emission signals to the sub-pixels; and
a driving controller which controls the data driver and the gate driver,
wherein the driving controller determines an on-duty period of an emission signal of the emission signals, based on a number of at least one cycle of a current frame, determines a first compensation value of a bias voltage according to a variation of the on-duty period, determines a second compensation value of the bias voltage, based on a driving frequency of a previous frame, and determines a third compensation value, based on the first compensation value and the second compensation value.