Black matrix structure and manufacturing method therefor, display substrate, and display device

A method for manufacturing the black matrix structure comprising:

• forming an initial black matrix structure on a base substrate, the initial black matrix structure comprising a plurality of initial black matrix strips that are intersected with each other, wherein the plurality of initial black matrix strips are of an integral structure formed by stacking a first trapezoidal truncated cone, a cuboid, and a second trapezoidal truncated cone sequentially along a direction facing away from the base substrate, wherein an upper base face of the first trapezoidal truncated cone and an upper base face of the second trapezoidal truncated cone are in contact with two opposite faces of the cuboid respectively, an area of a lower base face of the second trapezoidal truncated cone is larger than an area of a lower base face of the first trapezoidal truncated cone, and a side face of the first trapezoidal truncated cone and a side face of the second trapezoidal truncated cone protrude from a side face of the cuboid respectively;
• and
• removing and partially collapsing a structure of the second trapezoidal truncated cone of the initial black matrix strips in the initial black matrix structure that protrudes from the cuboid, with a collapsed portion covering a structure of the first trapezoidal truncated cone that protrudes from the cuboid, so as to acquire a final black matrix structure.