Method of eliminating OLED display panel Mura

A method of eliminating organic light emitting display (OLED) panel Mura, comprising steps of:

• step 1, providing an OLED panel and a brightness capturing device, and the OLED panel is made to show a 255 gray scale, and employing the brightness capturing device to capture actual brightnesses of respective sub pixels of the OLED panel at the 255 gray scale;
• step 2, making the OLED panel show a gray scale to be compensated;
• step 3, employing the brightness capturing device to capture actual brightnesses of respective sub pixels of the OLED panel at a present display gray scale;
• step 4, calculating a local gamma value at the present display gray scale, and a calculation formula is:
• Gamma
• ⁢
• i
• =
• log
• ⁡
• (
• L
• i
• L
• 255
• )
• log
• ⁡
• (
• Gray
• i
• 255
• )
• wherein i is an integer larger than or equal to 0, and i+1 is a number of a present iterative computation, and Gammai is the local gamma value at the present display gray scale, and Li is the actual brightness of the sub pixel at the present display gray scale, and L255 is the actual brightness of the sub pixel at the 255 gray scale, and the Grayi is the present display gray scale;
• step 5, capturing a gamma value of the OLED panel and preset target brightnesses of respective sub pixels, and selecting a corresponding calculation formula by comparing the gamma value of the OLED panel and the local gamma value at the present display gray scale to obtain a compensation gray scale should be utilized for achieving the preset target brightness of the sub pixel, and a specific calculation formula and an application condition are:
• if the local gamma value at the present display gray scale is larger than twice of the gamma value of the OLED panel, then the compensation gray scale should be utilized is calculated according to the following formula;
• Gray
• i
• +
• 1
• =
• (
• L
• goal
• L
• 255
• )
• 1
• Gamma
• i
• ×
• 255
• ;
• wherein Lgoal is a target brightness of the sub pixel, and Grayi+1 is the compensation gray scale;
• if the local gamma value at the present display gray scale is smaller than twice of the gamma value of the OLED panel, then the compensation gray scale should be utilized is calculated according to the following formula;
• Gray
• i
• +
• 1
• =
• (
• L
• goal
• L
• i
• )
• 1
• γ
• ×
• Gray
• i
• ;
• wherein γ is the gamma value of the OLED panel;
• step 6, making OLED panel to show the compensation gray scale obtained by a present calculation to determine whether a preset condition of ending the calculation of the compensation gray scale is achieved;
• if the condition of ending the calculation of the compensation gray scale is not achieved, then returning back to the step 3;
• if the condition of ending the calculation of the compensation gray scale is achieved, then ending the method;
• wherein the brightness capturing device is a charge coupled device (CCD);
• wherein in the step 5, the preset target brightnesses of the respective sub pixels are captured with a corresponding gamma curve of the gamma value of the OLED panel.