A processing circuit of a display panel, a display method and a display device are provided. The display panel is divided into a plurality of display regions. The processing circuit includes: a plurality of display control circuits corresponding to the plurality of display regions respectively; a sight line acquisition circuit configured to acquire a focused region of the display panel on which sight lines of human eyes are focused; and a control circuit configured to determine from the plurality of display regions a first display region overlapping the focused region and a second display region not overlapping the focused region, enable the display control circuit corresponding to the first display region to output first image data, and enable the display control circuit corresponding to the second display region to output second image data having a refresh rate smaller than the first image data.