Display apparatus and driving method thereof
A display apparatus includes a display panel including a pixel, a source driver outputting a data voltage supplied to the pixel, in a refresh frame and stop the output of the data voltage in at least one skip frame succeeding the refresh frame, and a bias controller configured to output a first on-bias stress voltage to the pixel, in the refresh frame and output a second on-bias stress voltage to the pixel, in the at least one skip frame. The first and second on-bias stress voltages are applied to one electrode of a driving transistor included in the pixel so as to improve a luminance difference caused by a leakage characteristic variation of the pixel, and the first and second on-bias stress voltages are different so that a threshold voltage characteristic of the driving transistor differs in the refresh frame and the at least one skip frame.
1 . A display apparatus comprising:
a display panel including at least one pixel;
a source driver configured to output a data voltage, which is to be supplied to the at least one pixel, in a refresh frame and stop an output of the data voltage, which is to be supplied to the at least one pixel, in at least one skip frame succeeding the refresh frame; and
a bias controller configured to output a first on-bias stress voltage, which is to be supplied to the at least one pixel, in the refresh frame and output a second on-bias stress voltage, which is to be supplied to the at least one pixel, in the at least one skip frame,
wherein the first on-bias stress voltage and the second on-bias stress voltage are applied to one electrode of a driving transistor included in the at least one pixel so as to improve a luminance difference caused by a leakage characteristic variation of the at least one pixel,
wherein the first on-bias stress voltage and the second on-bias stress voltage are differently set so that a threshold voltage characteristic of the driving transistor differs in the refresh frame and the at least one skip frame, and
wherein a voltage difference between the first on-bias stress voltage and the second on-bias stress voltage is determined based on a number of skip frames succeeding the refresh frame.
2 . The display apparatus of claim 1 , wherein the voltage difference between the first on-bias stress voltage and the second on-bias stress voltage increases in proportion to the number of skip frames succeeding the refresh frame.
3 . The display apparatus of claim 2 , wherein, when the number of skip frames succeeding the refresh frame is in plurality, second on-bias stress voltages corresponding to a plurality of skip frames are equal to one another.
4 . The display apparatus of claim 2 , wherein, when the number of skip frames succeeding the refresh frame is in plurality, second on-bias stress voltages corresponding to a plurality of skip frames are different from each other.
5 . The display apparatus of claim 1 , wherein, when a luminance of the at least one skip frame is lower than a luminance of the refresh frame, the second on-bias stress voltage is lower than the first on-bias stress voltage.
6 . The display apparatus of claim 1 , wherein, when a luminance of the at least one skip frame is higher than a luminance of the refresh frame, the second on-bias stress voltage is higher than the first on-bias stress voltage.
7 . The display apparatus of claim 1 , further comprising:
a gate driver configured to supply the at least one pixel with an emission control signal based on pulse width modulation so as to control an on and off timing of a light emitting device included in the at least one pixel,
wherein an off duty cycle of the emission control signal comprises a first off duty cycle and a second off duty cycle which is longer than the first off duty cycle.
8 . The display apparatus of claim 7 , wherein the first off duty cycle is provided between on duty cycles of the refresh frame and between on duty cycles of the at least one skip frame, and
the second off duty cycle is provided immediately before a first on duty cycle of the refresh frame, immediately after a last on duty cycle of the at least one skip frame, and between a last on duty cycle of the refresh frame and a first on duty cycle of the at least one skip frame.
9 . The display apparatus of claim 7 , wherein an on duty cycle of the emission control signal has a same length in the refresh frame and the at least one skip frame.
10 . A driving method of a display apparatus including a display panel including at least one pixel, the driving method comprising:
outputting a data voltage, which is to be supplied to the at least one pixel, in a refresh frame and stopping an output of the data voltage, which is to be supplied to the at least one pixel, in at least one skip frame succeeding the refresh frame; and
outputting a first on-bias stress voltage, which is to be supplied to the at least one pixel, in the refresh frame and outputting a second on-bias stress voltage, which is to be supplied to the at least one pixel, in the at least one skip frame,
wherein the first on-bias stress voltage and the second on-bias stress voltage are applied to one electrode of a driving transistor included in the at least one pixel so as to improve a luminance difference caused by a leakage characteristic variation of the at least one pixel,
wherein the first on-bias stress voltage and the second on-bias stress voltage are differently set so that a threshold voltage characteristic of the driving transistor differs in the refresh frame and the at least one skip frame, and
wherein a voltage difference between the first on-bias stress voltage and the second on-bias stress voltage is determined based on a number of skip frames succeeding the refresh frame.
11 . The driving method of claim 10 , wherein the voltage difference between the first on-bias stress voltage and the second on-bias stress voltage increases in proportion to the number of skip frames succeeding the refresh frame.
12 . The driving method of claim 11 , wherein, when the number of skip frames succeeding the refresh frame is in plurality, second on-bias stress voltages corresponding to a plurality of skip frames are equal to one another.
13 . The driving method of claim 11 , wherein, when the number of skip frames succeeding the refresh frame is in plurality, second on-bias stress voltages corresponding to a plurality of skip frames are different from each other.
14 . The driving method of claim 10 , wherein, when a luminance of the at least one skip frame is lower than a luminance of the refresh frame, the second on-bias stress voltage is lower than the first on-bias stress voltage.
15 . The driving method of claim 10 , wherein, when a luminance of the at least one skip frame is higher than a luminance of the refresh frame, the second on-bias stress voltage is higher than the first on-bias stress voltage.
16 . The driving method of claim 10 , further comprising:
supplying the at least one pixel with an emission control signal based on pulse width modulation so as to control an on and off timing of a light emitting device included in the at least one pixel,
wherein an off duty cycle of the emission control signal comprises a first off duty cycle and a second off duty cycle which is longer than the first off duty cycle.
17 . The driving method of claim 16 , wherein the first off duty cycle is provided between on duty cycles of the refresh frame and between on duty cycles of the at least one skip frame, and
the second off duty cycle is provided immediately before a first on duty cycle of the refresh frame, immediately after a last on duty cycle of the at least one skip frame, and between a last on duty cycle of the refresh frame and a first on duty cycle of the at least one skip frame.
18 . The driving method of claim 16 , wherein an on duty cycle of the emission control signal has a same length in the refresh frame and the at least one skip frame.