Image display apparatus and method thereof

1. An image display apparatus comprising:

a display panel;

a panel temperature sensor configured to detect a temperature of the display panel; and

a controller configured to:

calculate a threshold voltage for at least one pixel included in the display panel;

perform a primary afterimage compensation on the display panel based on the calculated threshold voltage;

monitor the temperature of the display panel through the panel temperature sensor when the primary afterimage compensation is performed;

calculate mobility for the at least one pixel based on the monitored temperature of the display panel being less than or equal to a reference temperature; and

perform a secondary afterimage compensation on the display panel based on the calculated mobility.

2. The image display apparatus according to claim 1 , wherein the controller is further configured to determine an offset value corresponding to a change in the threshold voltage to perform the primary afterimage compensation.

3. The image display apparatus according to claim 1 , wherein the controller is further configured to determine a gain value corresponding to the calculated mobility to perform the secondary afterimage compensation.

4. The image display apparatus according to claim 1 , wherein the controller is further configured to calculate the threshold voltage based on a control signal for turning off a power of the image display apparatus being received.

5. The image display apparatus according to claim 1 , further comprising a second temperature sensor configured to detect an ambient temperature around the image display apparatus,

wherein the controller is further configured to:

check the ambient temperature through the second temperature sensor when the primary afterimage compensation is performed; and

determine a period of monitoring the temperature of the display panel based on the checked ambient temperature.

6. The image display apparatus according to claim 5 , wherein the controller is further configured to:

determine the period as a first period based on the checked ambient temperature being equal to a first temperature; and

determine the period as a second period shorter than the first period based on the checked ambient temperature being lower than the first temperature.

7. A method of operating an image display apparatus, the method comprising:

calculating a threshold voltage for at least one pixel included in a display panel of the image display apparatus;

performing a primary afterimage compensation on the display panel based on the calculated threshold voltage;

monitoring a temperature of the display panel through a panel temperature sensor included in the image display apparatus when the primary afterimage compensation is performed;

calculating mobility for the at least one pixel based on the monitored temperature of the display panel being less than or equal to a reference temperature; and

performing a secondary afterimage compensation on the display panel based on the calculated mobility.

8. The method according to claim 7 , wherein monitoring the temperature of the display panel comprises:

checking an ambient temperature around the image display apparatus through a second temperature sensor included in the image display apparatus when the primary afterimage compensation is performed; and

determining a period of monitoring the temperature of the display panel based on the checked ambient temperature.