A display panel comprising: a substrate; a first pixel electrode disposed on the substrate; a pixel definition layer disposed on a side of the first pixel electrode away from the substrate and comprising a plurality of pixel openings to expose a portion of a surface of the first pixel electrode; and a plurality of first type of separation pillars disposed on a side of the pixel definition layer away from the first pixel electrode, wherein a width of one of the first type of separation pillars changes continuously or intermittently in an extending direction of one of the first type of separation pillars, and the extending direction of one of the first type of separation pillars is parallel to the substrate; wherein the width is a dimension of a projection of one of the first type of separation pillars on the substrate in a direction perpendicular to the extending direction of one of the first type of separation pillars; wherein the width periodically changes along the extending direction, one width changing period of the plurality of first type of separation pillars corresponding to one sub-pixel area; wherein the plurality of first type of separation pillars has a bottom surface in contact with the pixel definition layer and a top surface positioned opposite to the bottom surface; wherein, in the direction perpendicular to the extending direction of one of the first type of separation pillars, a width of the top surface is greater than or equal to a width of the bottom surface; and and wherein the top surface has a changing width along the extending direction of one of the first type of separation pillars; characterised in that at least one of two side edges of the top surface of one of the first type of separation pillars along the extending direction of one of the first type of separation pillars has a shape of at least one of an arc and a semicircle. a substrate; a first pixel electrode disposed on the substrate; a pixel definition layer disposed on a side of the first pixel electrode away from the substrate and comprising a plurality of pixel openings to expose a portion of a surface of the first pixel electrode; and a plurality of first type of separation pillars disposed on a side of the pixel definition layer away from the first pixel electrode, wherein a width of one of the first type of separation pillars changes continuously or intermittently in an extending direction of one of the first type of separation pillars, and the extending direction of one of the first type of separation pillars is parallel to the substrate; wherein the width is a dimension of a projection of one of the first type of separation pillars on the substrate in a direction perpendicular to the extending direction of one of the first type of separation pillars; wherein the width periodically changes along the extending direction, one width changing period of the plurality of first type of separation pillars corresponding to one sub-pixel area; wherein the plurality of first type of separation pillars has a bottom surface in contact with the pixel definition layer and a top surface positioned opposite to the bottom surface; wherein, in the direction perpendicular to the extending direction of one of the first type of separation pillars, a width of the top surface is greater than or equal to a width of the bottom surface; and and wherein the top surface has a changing width along the extending direction of one of the first type of separation pillars; characterised in that at least one of two side edges of the top surface of one of the first type of separation pillars along the extending direction of one of the first type of separation pillars has a shape of at least one of an arc and a semicircle.