A display substrate, comprising a base ; a pixel defining layer , provided on the base , the pixel defining layer including a plurality of sub-pixel regions , and at least one storage tank defined by the pixel defining layer being provided in each of the plurality of sub-pixel regions ; wherein the pixel defining layer includes a halogen polymer, which includes an halogen compound, and the content of the halogen compound gradually increases from a position close to the base to the top surface of the pixel defining layer; wherein, in the length direction of the storage tank , the height of an end portion of the storage tank is larger than the height of a portion of the storage tank that is located between the two end portions; wherein, in the length direction of the storage tank , from the end portion of the storage tank to the center of the storage tank that is located between the two end portions, the height of the storage tank gradually decreases; wherein, at an identical height with respect to the base , in the length direction of the storage tank , the end portion of the storage tank and the portion between the two end portions of the storage tank differ in wettability to a storage material; wherein in the length direction of the storage tank , at an identical height with respect to the base , wettability of the end portion of the storage tank to the storage material is stronger than wettability of the portion between the two end portions of the storage tank to the storage material; wherein in the length direction of the storage tank , from the end portion of the storage tank to the center of the storage tank that is located between the two end portions, at an identical height with respect to the base , the wettability gradually decreases. a base ; a pixel defining layer , provided on the base , the pixel defining layer including a plurality of sub-pixel regions , and at least one storage tank defined by the pixel defining layer being provided in each of the plurality of sub-pixel regions ; wherein the pixel defining layer includes a halogen polymer, which includes an halogen compound, and the content of the halogen compound gradually increases from a position close to the base to the top surface of the pixel defining layer; wherein, in the length direction of the storage tank , the height of an end portion of the storage tank is larger than the height of a portion of the storage tank that is located between the two end portions; wherein, in the length direction of the storage tank , from the end portion of the storage tank to the center of the storage tank that is located between the two end portions, the height of the storage tank gradually decreases; wherein, at an identical height with respect to the base , in the length direction of the storage tank , the end portion of the storage tank and the portion between the two end portions of the storage tank differ in wettability to a storage material; wherein in the length direction of the storage tank , at an identical height with respect to the base , wettability of the end portion of the storage tank to the storage material is stronger than wettability of the portion between the two end portions of the storage tank to the storage material; wherein in the length direction of the storage tank , from the end portion of the storage tank to the center of the storage tank that is located between the two end portions, at an identical height with respect to the base , the wettability gradually decreases. <EOS>