Display substrate and method for preparing the same, and display device

A method for preparing a display substrate that comprises a pad bending region, a base in the pad bending region, and an inorganic insulating layer and a metal layer laminated on the base;

• wherein the metal layer comprises a plurality of discrete metal wires, and the inorganic insulating layer comprises a plurality of discrete first inorganic insulating layers, each of which is arranged between a respective one of the plurality of discrete metal wires and the base;
• wherein in a region outside the pad bending region, the inorganic insulating layer is also present between the plurality of discrete metal wires, and an organic insulating layer is provided on the metal wires and in direct contact with the metal wires;
• wherein a cross-section of metal wires along an extending direction of the metal wires and passing through the metal wires is of concave shape with two end parts extending along the extending direction of the metal wires, and a first end part of the metal wires is covered by the organic insulating layer, and a second end part of the metal wires is partially covered by the organic insulating layer;
• and wherein the inorganic insulating layer is in physical contact with the metal wires and the base, and comprises a buffer layer, a first insulating layer, a second insulating layer and an interlayer insulating layer,
• the method comprising:
• forming the inorganic insulating layer and the metal layer in sequence on the base of the pad bending region;
• forming the metal layer into the plurality of discrete metal wires through a patterning process using a first mask, wherein the pad bending region comprises a metal wire region where the plurality of discrete metal wires is located and an external region outside the metal wire region;
• and
• removing the inorganic insulating layer in the external region.