Method of displaying an image, display apparatus performing the same, method and apparatus of calculating a correction value applied to the same

A display apparatus comprising:

• a display panel having a plurality of pixels arranged in rows and columns;
• a storage part configured to store a row correction value and a column correction value corresponding to a sample-grayscale, wherein the row correction value is calculated based on an average luminance of pixels in a pixel row of a sample-grayscale image and the column correction value is calculated based on an average luminance of pixels in a pixel column of the sample-grayscale image;
• a stain correction part configured to generate correction data for received data using a row correction value and a column correction value corresponding to a pixel position of the received data;
• and
• a data driving part configured to convert the correction data to a data voltage to provide a data line of the display panel with the data voltage.

A method of calculating a correction value comprising:

• calculating a first average luminance level of a pixel column of a sample-grayscale image displayed on a display panel and a second average luminance level of a pixel row of the displayed sample-grayscale image;
• calculating a column correction value corresponding to the pixel column using a first reference luminance level and the first average luminance level;
• calculating a row correction value corresponding to the pixel row using a second reference luminance level and the second average luminance level;
• and
• storing the column correction value and the row correction value.