A display panel, a method of manufacturing the display panel and a display device including the display panel are disclosed. The display panel includes a first substrate; a second substrate disposed opposite to the first substrate; a plurality of supporting posts disposed on a side surface of the first substrate facing the second substrate; and a plurality of adhering parts disposed on a side surface of the second substrate facing the first substrate, each of the plurality of adhering parts corresponding to the plurality of supporting posts respectively. Two opposite side surfaces of each of the plurality of adhering parts are respectively in contact with the corresponding one of the plurality of supporting posts and the second substrate to adhere the corresponding one of the plurality of supporting posts to the second substrate.