Gray scale adjustment method and device for display panel

A gray scale adjustment device for a display panel, comprising:

• an image acquisition module, configured to perform an image acquisition on the display panel to obtain a current image;
• an identification module, configured to identify an uneven block in the current image by a distinguishing method, and to detect an original output luminance and an original input gray scale of the uneven block, wherein the distinguishing method is to identify a block in which an average value of all pixel gray scale values in a set range is lower than a target value in the current image or to identify a block in which an average value of all pixel gray scale values in a set range is higher than a target value in the current image;
• a calculation module, configured to determine a target input gray scale corresponding to a preset target luminance according to an actual gamma curve value, wherein the actual gamma curve value is obtained by testing the display panel;
• and
• an adjustment module, configured to take a difference between the original input gray scale and the target input gray scale as a gray scale compensation value of the uneven block and transmit the gray scale compensation value to the display panel, wherein the display panel adds the gray scale compensation value to the original input gray scale of the uneven block as a new input gray scale of the uneven block to eliminate the uneven block in the current image.