Method for enhancing luminance uniformity of a display panel

A method for enhancing luminance uniformity of a display panel that includes a plurality of sub-pixels for a same color element, said method comprising:

• measuring, by an automated optical inspection (AOI) system and for each of the sub-pixels, luminance of the sub-pixel each time a different one of multiple predetermined AOI luminance codes is used to drive the sub-pixel, so as to obtain a plurality of data points for the sub-pixel, where each of the data points is composed of one of the predetermined AOI luminance codes and a luminance value of the sub-pixel that is measured by the AOI system when said one of the predetermined AOI luminance codes is used to drive the sub-pixel;
• generating, by the computer device, a first polynomial function describing a first reference curve that represents a first reference relationship between luminance code and luminance and that has a plurality of first reference data points each of which is composed of one of the predetermined AOI luminance codes and a first reference luminance value corresponding to said one of the predetermined AOI luminance codes;
• generating, by the computer device and for each of the sub-pixels, a plurality of second reference data points each of which is composed of one of the predetermined AOI luminance codes, and a second reference luminance value relating to a difference between the first reference luminance value corresponding to said one of the predetermined AOI luminance codes and the luminance value of one of the data points corresponding to the sub-pixel and said one of the predetermined AOI luminance codes;
• performing, by the computer device and for each of the sub-pixels, curve fitting on the second reference data points corresponding to the sub-pixel to obtain a second polynomial function that describes a curve fitting the second reference data points which correspond to the sub-pixel;
• acquiring, by the computer device and for each of the sub-pixels, a data-points fitting function based on the first polynomial function and the second polynomial function;
• performing, by a computerized device that includes the display panel, demura operation on pre-demura image frame data based on the data-points fitting functions corresponding to the sub-pixels to generate post-demura image frame data, wherein the pre-demura image frame data relates to an image of a frame to be displayed by the display panel;
• and
• displaying, by the display panel, the image of the frame based on the post-demura image frame data.