A display method of a display device comprising a display panel wherein the display panel comprises a plurality of pixel units wherein, each of the plurality of pixel units is formed in a regular hexagonal shape and is made up of three rhombic sub-pixels spliced with each other, and every two adjacent rhombic sub-pixels of the three rhombic sub-pixels share one common edge and are symmetrical about the common edge; and, wherein, every two adjacent pixel units, except the pixel units at a margin of the display panel, of the plurality of pixel units share one common edge; the display panel comprises two types of pixel units comprising RGB pixel units and XYW pixel units; wherein, in each of the RGB pixel units, the three rhombic sub-pixels comprise a red rhombic sub-pixel, a blue rhombic sub-pixel and a green rhombic sub-pixel; in each of the XYW pixel units, the three rhombic sub-pixels comprise a white rhombic sub-pixel and any two of a red rhombic sub-pixel, a blue rhombic sub-pixel and a green rhombic sub-pixel; the three rhombic sub-pixels have the same size; each of the XYW pixel units comprises an RGW pixel unit, an RBW pixel unit or a BGW pixel unit; wherein, in the RGW pixel unit, the three rhombic sub-pixels comprise a red rhombic sub-pixel, a green rhombic sub-pixel and a white rhombic sub-pixel; in the RBW pixel unit, the three rhombic sub-pixels comprise a red rhombic sub-pixel, a blue rhombic sub-pixel and a white rhombic sub-pixel; and in the BGW pixel unit, the three rhombic sub-pixels comprise a blue rhombic sub-pixel, a green rhombic sub-pixel and a white rhombic sub-pixel; and the RGB pixel units and the XYW pixel units are arranged alternately in a preset direction, and, the rhombic sub-pixels of the two types of pixel units, major axes of rhomb shapes of which are arranged in the preset direction, are arranged in an end-to-end point contact manner; wherein, in the XYW pixel units, white rhombic sub-pixels are arranged such that their major axes of rhomb shapes are arranged in the preset direction; in the RGB pixel units, any one of the red rhombic sub-pixels, the blue rhombic sub-pixels and the green rhombic sub-pixels is arranged such that its major axis of rhomb shape is arranged in the preset direction; in the display panel, the rhombic sub-pixels, having one color, of each of the pixel units are not arranged adjacent to the rhombic sub-pixels, having the same color, of their adjacent ones of the pixel units; and the preset direction is a column direction or a row direction; the display method performed by the display device comprising the steps of: jointing sub-pixels, having the same color, of the pixel units of the display panel adjacent to each other, to form a polygon shape as a sampling area for the corresponding color, such that the sub-pixels having different colors form different sampling areas for different colors, respectively; wherein, when one color is to be displayed within the corresponding sampling area, the sub-pixels within the corresponding sampling area are lighted for displaying the color. in the RGW pixel unit, the three rhombic sub-pixels comprise a red rhombic sub-pixel, a green rhombic sub-pixel and a white rhombic sub-pixel; in the RBW pixel unit, the three rhombic sub-pixels comprise a red rhombic sub-pixel, a blue rhombic sub-pixel and a white rhombic sub-pixel; and in the BGW pixel unit, the three rhombic sub-pixels comprise a blue rhombic sub-pixel, a green rhombic sub-pixel and a white rhombic sub-pixel; and in the XYW pixel units, white rhombic sub-pixels are arranged such that their major axes of rhomb shapes are arranged in the preset direction; in the RGB pixel units, any one of the red rhombic sub-pixels, the blue rhombic sub-pixels and the green rhombic sub-pixels is arranged such that its major axis of rhomb shape is arranged in the preset direction; in the display panel, the rhombic sub-pixels, having one color, of each of the pixel units are not arranged adjacent to the rhombic sub-pixels, having the same color, of their adjacent ones of the pixel units; and the preset direction is a column direction or a row direction;