Method of determining fitting functions for sub-pixels of a display panel

A method of determining fitting functions for sub-pixels of a same color element of a display panel, the method to be performed by a computer device and comprising:

• acquiring, for each of the sub-pixels, a data point set that includes a plurality of data points respectively corresponding to multiple predetermined luminance codes, wherein each of the data points is composed of the corresponding one of the predetermined luminance codes and a luminance value of the sub-pixel measured at the corresponding one of the predetermined luminance codes;
• obtaining a plurality of fitting functions by performing curve fitting based on the data point sets acquired for the sub-pixels;
• and
• for each of the sub-pixels, determining a filtered fitting function, which is one of the fitting functions that conforms to a predetermined filtering criterion, to fit the data point set acquired for the sub-pixel, the filtered fitting functions determined for the sub-pixels being to be used in demura operation for the display panel;
• wherein, for each of the sub-pixels, the predetermined filtering criterion includes a single-pixel criterion that relates to a fitting deviation, which corresponds to the sub-pixel and which relates to a mismatch between the filtered fitting function and the data points corresponding to the sub-pixel.