Organic light-emitting diode display substrate and display device

An organic light-emitting diode display substrate, comprising a light-emitting layer, a light modulation layer, and a color conversion layer, wherein the light-emitting layer is configured to emit a first color light, the light modulation layer and the color conversion layer are arranged on different light-exiting paths of the light-emitting layer, the color conversion layer is configured to convert the first color light into a second color light and a third color light, and the light modulation layer is configured to modulate an emergent direction of the first color light,

• wherein the light-emitting layer comprises a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are periodically arranged on a driving substrate and emit the first color light, the light modulation layer comprises a first light modulation unit that is arranged on a light-exiting path of the first light-emitting unit and modulates the emergent direction of the first color light, and the color conversion layer comprises a second color conversion unit that is arranged on a light-exiting path of the second light-emitting unit and converts the first color light into the second color light and the third color conversion unit that is arranged on a light-exiting path of the third light-emitting unit and converts the first color light into the third color light, and
• wherein the first light modulation unit is a laminated structure comprising a plurality of modulation layers that are stacked sequentially along a direction perpendicular to a surface of the driving substrate on which a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit are periodically arranged, each of the plurality of modulation layers comprising a matrix layer and microparticles distributed in the matrix layer, a refractive index of the matrix layer being different from a refractive index of the microparticles.