Light emitting display apparatus and driving method thereof

1. A light emitting display apparatus comprising:

a display panel configured to display an image;

a timing controller including:

a set value output unit configured calculate a refresh rate of the display panel based on a data signal which is to be supplied to the display panel;

an on bias stress (OBS) voltage calculator configured to calculate an OBS voltage value based on the calculated refresh rate of the display panel and the data signal; and

a power supply configured to generate an OBS voltage based on of the calculated OBS voltage value, the OBS voltage supplied to an electrode of a driving transistor of a pixel included in the display panel.

2. The light emitting display apparatus of claim 1 , wherein the OBS voltage varies per at least one pixel, at least one line, or at least one frame based on the refresh rate and the data signal.

3. A light emitting display apparatus comprising:

a display panel configured to display an image;

a timing controller including an on bias stress (OBS) voltage calculator configured to calculate an OBS voltage value based on a refresh rate of the display panel and a data signal which is to be supplied to the display panel; and

a power supply configured to generate an OBS voltage which is to be supplied to the display panel based on of the OBS voltage value, the OBS voltage including:

a first OBS voltage applied before the data voltage applied to the display panel is sampled, during a refresh period of the display panel;

a second OBS voltage applied after the data voltage applied to the display panel is sampled, during the refresh period of the display panel;

a third OBS voltage applied before the data voltage applied to the display panel is sampled, during an anode reset period of the display panel that occurs after the first OBS voltage and the second OBS voltage are applied during the refresh period; and

a fourth OBS voltage applied after the data voltage applied to the display panel is sampled and after the third OBS voltage is applied, during the anode reset period of the display panel.

4. The light emitting display apparatus of claim 3 , wherein the first OBS voltage to the fourth OBS voltage vary based on the refresh rate and the data signal.

5. The light emitting display apparatus of claim 3 , wherein the first OBS voltage to the fourth OBS voltage vary based on the refresh rate, the data signal, and digital brightness.

6. The light emitting display apparatus of claim 1 , wherein the set value output unit is further configured to calculate a value of a park voltage set which is to be supplied during an anode reset period of the display panel, a value of the refresh rate set of the display panel and a value of a gamma set for converting the data signal into a data voltage, based on an analysis result of the data signal input from outside.

7. The light emitting display apparatus of claim 6 , wherein the OBS voltage calculator calculates the OBS voltage value based on the value of the park voltage set, the value of the refresh rate set, the value of the gamma set, and a process deviation data value read from a lookup table.

8. The light emitting display apparatus of claim 1 , further comprising:

an OBS voltage controller configured to control the OBS voltage supplied from the power supply to supply the controlled OBS voltage to the display panel.

9. The light emitting display apparatus of claim 8 , wherein the OBS voltage controller is configured to control the OBS voltage output method by pixel units, line units, or frame units.