Image quality compensation device and method for organic light emitting display

An image quality compensation device for an organic light emitting display, the device comprising:

• a display panel having pixels arranged in a matrix form, each pixel having a driving transistor;
• a data drive circuit configured to drive data signal lines;
• a memory having first and second update blocks for selectively storing first and second period compensation values, which are sequentially updated at regular intervals, the memory further including an initial value storing block disposed between the first and second update blocks for storing a preset initial compensation value;
• and
• a timing controller configured to:
• configure the first update block as either one of a current memory page for data loading or a next memory page for data writing and the second update block as the other of the two memory pages based on a preset check code, and
• update the memory by calculating the second period compensation value with a passage of driving time based on the first period compensation value loaded from the update block configured as the current memory page, writing the calculated second period compensation value to the update block configured as the next memory page, and then erasing the first period compensation value from the update block configured as the current memory page,
• wherein the second period compensation value is calculated by deriving a shift value with the passage of driving time with reference to electrical characteristic values of the driving transistor sensed by the data drive circuit and adding the shift value to the preset initial compensation value.