Correction method for display panel and display device

A correction method for a display panel, comprising:

• dividing a common electrode layer of the display panel into at least one region;
• applying a respective initial voltage to each of the at least one region of the common electrode layer, and measuring the respective initial voltages of the at least one region, wherein the initial voltage is a common voltage and the common voltage of each of the at least one region of the common electrode layer is independently controlled;
• comparing a first deviation value of each of the respective common voltages of the at least one region shifting from a preset voltage against a preset deviation value, wherein the preset voltage is a voltage of the common electrode layer when the display panel normally displays;
• when the first deviation value of each of the respective common voltages of the at least one region shifting from the preset voltage is smaller than the preset deviation value, determining that the display panel displays normally;
• otherwise when the first deviation value is larger than the preset deviation value, taking the region corresponding to the first deviation value as a color shift region;
• adjusting the common voltage of the color shift region to be equal to the preset voltage;
• determining a gray-scale compensation value based on a sub-pixel voltage corresponding to each sub-pixel in the color shift region and the preset voltage;
• and
• compensating a data voltage of each sub-pixel in the color shift region according to the respective gray-scale compensation value;
• wherein the determining a gray-scale compensation value according to the sub-pixel voltage corresponding to each of the sub-pixels in the color shift region and the preset voltage comprises:
• calculating a second deviation value of the sub-pixel voltage corresponding to each sub-pixel in the color deviation region from the preset voltage;
• obtaining a gray-scale compensation table comprising a mapping relation between the second deviation value and the gray-scale compensation value;
• and
• obtaining the gray-scale compensation value according to the second deviation value.

A display device, comprising:

• a display panel configured to display images;
• a display control module electrically connected to the display panel, the display control module comprises a timing controller comprising a storage unit, a processing unit and a computer program stored on the storage unit and operable on the processing unit, the program, when executed by the processing unit, implements the steps of:
• dividing a common electrode layer of the display panel into at least one region;
• applying a respective initial voltage to each of the at least one region of the common electrode layer, and measuring the respective initial voltages of the at least one region, wherein the initial voltage is a common voltage and the common voltage of each of the at least one region of the common electrode layer is independently controlled;
• comparing a first deviation value of each of the respective common voltages of the at least one region shifting from a preset voltage against a preset deviation value, wherein the preset voltage is a voltage of the common electrode layer when the display panel normally displays;
• when the first deviation value is larger than the preset deviation value, taking the region corresponding to the first deviation value as a color shift region;
• adjusting the common voltage of the color shift region to be equal to the preset voltage;
• determining a gray-scale compensation value based on a sub-pixel voltage corresponding to each sub-pixel in the color shift region and the preset voltage;
• and
• compensating a data voltage of each sub-pixel in the color shift region according to the respective gray-scale compensation value;
• wherein the determining a gray-scale compensation value according to the sub-pixel voltage corresponding to each of the sub-pixels in the color shift region and the preset voltage comprises:
• calculating a second deviation value of the sub-pixel voltage corresponding to each sub-pixel in the color deviation region from the preset voltage;
• obtaining a gray-scale compensation table comprising a mapping relation between the second deviation value and the gray-scale compensation value;
• and
• obtaining the gray-scale compensation value according to the second deviation value.