Foldable display device and method for compensating for deterioration of flexible display panel

A method of compensating for deterioration of a flexible display panel, the method comprising:

• sensing a display luminance of a test image displayed on a flexible display panel that includes a folding line, a first display area disposed on a first side of the folding line, and a second display area disposed on a second side of the folding line to display the test image;
• and
• wherein the sensing the display luminance includes an optical module performing a sensing operation when a folding angle between the first display area and the second display area is less than or equal to a reference angle,
• performing, by a deterioration compensator, a deterioration compensating operation of comparing the display luminance with a target luminance, and compensating for the display luminance by a luminance compensation value during a period in which the display luminance is less than the target luminance and not performing the deterioration compensating operation during a period in which the display luminance is greater than the target luminance,
• wherein the deterioration compensating operation is performed by using a lookup table including the luminance compensation value corresponding to a stress value of the flexible display panel,
• wherein the target luminance is the display luminance when the stress value is zero, and
• wherein the deterioration compensator includes:
• a memory device configured to store the stress value of the flexible display panel;
• a compensation value calculator configured to calculate the luminance compensation value based on the stress value;
• and a compensation determiner configured to determine whether to perform the deterioration compensating operation by comparing the display luminance with the target luminance, and compensate for the display luminance by the luminance compensation value when the deterioration compensating operation is performed,
• wherein the deterioration compensating operation is to compensate for a deterioration of the flexible display panel due to a use of the flexible display panel.

A method of compensating for deterioration of a flexible display panel, the method comprising:

• sensing a display luminance of a test image displayed on a flexible display panel that includes a folding line, a first display area disposed on a first side of the folding line, and a second display area disposed on a second side of the folding line to display the test image;
• and
• performing a deterioration compensating operation of compensating for the display luminance by a luminance compensation value when the display luminance is less than a target luminance and not performing the deterioration compensating operation when the display luminance is greater than the target luminance,
• wherein the deterioration compensating operation is performed by using a lookup table including the luminance compensation value corresponding to a stress value of the flexible display panel,
• wherein the target luminance is the display luminance when the stress value is zero, and
• wherein the deterioration compensating operation is to compensate for a deterioration of the flexible display panel due to a use of the flexible display panel.