Fingerprint identification substrate and display device

A fingerprint identification substrate, comprising:

• a base substrate,
• a plurality of photosensitive modules on the base substrate,
• a collimating optical structure arranged on light entering sides of the plurality of photosensitive modules,
• a plurality of function layers, and
• an insulation layer between every two adjacent function layers;
• wherein the photosensitive modules are configured to collect light rays reflected by a fingerprint;
• and
• the collimating optical structure comprises light shading layers and light transmitting layers arranged alternately;
• wherein each of the light shading layers has a plurality of light transmitting holes,
• orthographic projections of the plurality of light transmitting holes on the base substrate are in orthographic projections of the photosensitive modules on the base substrate,
• light transmitting holes of one of the light shading layers and light transmitting holes of another of the light shading layers are mutually overlapped in a direction perpendicular to the base substrate,
• each of the light shading layers and one of the function layers share a same film layer, and
• each of the light transmitting layers and one of the insulation layers multiplex a same film layer.