Light-Emitting Substrate, Backlight Module and Display Device

A light-emitting substrate, comprising:

• a first substrate;
• a reflective layer, disposed on the first substrate and provided with a plurality of first openings, wherein at least for two cross-sections of a plurality of cross-sections, parallel to a plane where the first substrate is located, of a first opening of the plurality of first openings, an area of a cross-section relatively proximate to the first substrate is less than an area of a cross-section relatively away from the first substrate;
• and
• support columns, located on a side of the reflective layer away from the first substrate and fixed on the first substrate, wherein an orthographic projection of a support column of the support columns on the first substrate is a first projection, an orthographic projection of a minimum cross-section of the plurality of cross-sections, parallel to the plane where the first substrate is located, of the first opening is a second projection, and the second projection lies within a range of the first projection.