Display substrate, manufacturing method thereof, and display device

A display device, comprising a display substrate, the display substrate having a plurality of pixels distributed in an array, wherein the display substrate comprises:

• a light-emitting substrate, comprising a base substrate, a plurality of light-emitting devices, a plurality of switch elements and an encapsulation layer which are arranged on the base substrate, wherein the switch element is configured to drive the light-emitting device to emit light, the encapsulation layer encapsulates the light-emitting device, and at least one light-emitting device and at least one switch element are arranged in each pixel correspondingly;
• a color conversion layer, arranged at a side of the encapsulation layer away from the base substrate, wherein the color conversion layer comprises a separation bank, a color conversion pattern and a leveling layer;
• the separation bank comprises a plurality of first portions extending in a first direction and a plurality of second portions extending in a second direction, the first direction intersects with the second direction and is parallel to the base substrate;
• the plurality of first portions and the plurality of second portions intersect with each other to define a plurality of first openings corresponding to the plurality of pixels;
• at least one of the first portion and the second portion comprises a light-transmitting bank pattern and a light-shielding bank pattern;
• the light-transmitting bank pattern is provided with a groove arranged in a direction in which the at least one of the first portion and the second portion extends, the light-shielding bank pattern is filled in the groove;
• the color conversion pattern is arranged in the first opening, and a first step is between the color conversion pattern and the separation bank in a direction perpendicular to the base substrate, and the leveling layer at least partially fills the first opening to fill the first step and form a flat surface at a side away from the base substrate;
• and
• a color filtering layer, arranged at a side of the color conversion layer away from the base substrate, wherein the color filtering layer comprises a light-shielding pattern and a color filtering pattern, the light-shielding pattern defines a plurality of second openings corresponding to the plurality of first openings, and the color filtering pattern is arranged in the second opening.

A method for manufacturing a display substrate, the method comprising:

• forming a light-emitting substrate, wherein the light-emitting substrate comprises a base substrate, a plurality of light-emitting devices, a plurality of switch elements and an encapsulation layer which are arranged on the base substrate, wherein the switch element is configured to drive the light-emitting device to emit light, the encapsulation layer encapsulates the light-emitting device, and at least one light-emitting device and at least one switch element are arranged in each pixel correspondingly;
• forming a color conversion layer at a side of the encapsulation layer away from the base substrate, wherein the color conversion layer comprises a separation bank, a color conversion pattern and a leveling layer;
• the separation bank comprises a plurality of first portions extending in a first direction and a plurality of second portions extending in a second direction, the first direction intersects with the second direction and parallel to the base substrate;
• the plurality of first portions and the plurality of second portions intersect with each other to define a plurality of first openings corresponding to the plurality of pixels;
• the separation bank is divided into a light-transmitting bank pattern and a light-shielding bank pattern, the light-transmitting bank pattern is provided with a groove arranged along at least one of the first direction and the second direction;
• the light-shielding bank pattern is filled in the groove, the color conversion pattern is arranged in the first opening, and a first step is between the color conversion patter and the separation bank in a direction perpendicular to the base substrate;
• and the leveling layer at least fills the first step to form a flat surface at a side away from the base substrate;
• and
• forming a color filtering layer at a side of the color conversion layer away from the base substrate, wherein the color filtering layer comprises a light-shielding pattern and a color filtering pattern, the light-shielding pattern defines second openings corresponding to the plurality of first openings, and the color filtering pattern is arranged in the second opening.