The invention discloses a light ray convergence device and a display device, and belongs to the technical field of display. The light ray convergence device comprises a plurality of light ray convergence mechanisms. The light ray convergence mechanisms are arranged in an array manner on a light output surface of a preset structure of a display panel. Each light ray convergence mechanism is a prism comprising a light input surface, a first light output surface and a second light output surface, wherein the light input surface of the prism is arranged in a manner of facing to the light output surface of the preset structure of the display panel; the refractive index of each light ray convergence mechanism is larger than refractive index of external environment; and the included angle between any two surfaces of the light input surface, the first light output surface and the second light output surface meets alpha1> alpha3, and alpha2> alpha3, the alpha1 being the included angle between the first light output surface and the light input surface, the alpha2 being the included angle between the second light output surface and the light input surface, and the alpha3 being the included angle between the first light output surface and the second light output surface. The light ray convergence device solves the problem of low light utilization rate, realizes the effect of improving light utilization rate, and is used for light ray convergence.