Display device and brightness correction method thereof

The invention discloses a display device and a brightness correction method thereof, and relates to the technical field of display, and the brightness correction method of the display device comprises the steps: applying a preset current to a lamp bead on a mini LED lamp panel for a preset time; recording an ideal gray scale and an actual gray scale corresponding to the actual current value within a preset time to obtain a curve model; calculating a gray scale difference value between an actual gray scale and an ideal gray scale through the curve model; counting all the gray scale difference values, and recording an average value among all the gray scale difference values to obtain fluctuation difference value data; changing the magnitude of the preset current, repeating the steps to obtain corresponding fluctuation difference data under different preset currents, and forming a mapping relation; and writing the mapping relation into a memory of the display panel, so that the display device compensates display