Display substrate, method of manufacturing display substrate, and display device having monochromatic filter layer

A display substrate, comprising:

• a base substrate;
• a color filter layer arranged on the base substrate, wherein the color filter layer comprises a plurality of sub-color filters comprising at least a first primary color sub-color filter, a second primary color sub-color filter and a third primary color sub-color filter, the first primary color, the second primary color and the third primary color are different from each other;
• and
• a monochromatic filter layer arranged on a side of the color filter layer away from the base substrate, wherein the monochromatic filter layer is formed as a filter layer with a fourth primary color, one of the first primary color, the second primary color and the third primary color is the same as the fourth primary color, or the first primary color, the second primary color, the third primary color and the fourth primary color are different from each other,
• wherein at least one of an orthographic projection of the first primary color sub-color filter on the base substrate, an orthographic projection of the second primary color sub-color filter on the base substrate and an orthographic projection of the third primary color sub-color filter on the base substrate at least partially overlaps an orthographic projection of the monochromatic filter layer on the base substrate;
• wherein the display substrate further comprises at least one of a first cover layer arranged between the color filter layer and the monochromatic filter layer and a second cover layer arranged on a side of the monochromatic filter layer away from the base substrate,
• wherein the display substrate further comprises:
• a metal light-shielding layer arranged on the side of the monochromatic filter layer away from the base substrate, wherein at least one of the orthographic projection of the first primary color sub-color filter on the base substrate, the orthographic projection of the second primary color sub-color filter on the base substrate and the orthographic projection of the third primary color sub-color filter on the base substrate at least partially overlaps the orthographic projection of the monochromatic filter layer on the base substrate so as to form an overlapping region on the base substrate, and an orthographic projection of the metal light-shielding layer on the base substrate is at least partially located in the overlapping region;
• and
• wherein an orthographic projection of the second cover layer on the base substrate does not overlap the orthographic projection of the metal light-shielding layer on the base substrate.