Display panel, backlight module and display device

A backlight module for a liquid crystal display panel, comprising a backlight source configured to provide a light source for the liquid crystal display panel, the liquid crystal panel comprising a plurality of pixels each of which comprise at least three sub-pixels of different colors,

• wherein the backlight module further comprises a photonic crystal layer located at a light-emergent side of the backlight source, in a region thereof corresponding to at least one of the sub-pixels of different colors of the liquid display panel, and the photonic crystal layer being configured to filter a light ray in a predetermined waveband and to obtain a color of an emergent light from the region of the display panel corresponding to the at least one of the sub-pixels similar to an object color thereat;
• wherein the photonic crystal layer comprises a base film layer and micropores formed and distributed uniformly in the base film layer, the micropores having a refractive index smaller than that of the base film layer, and the base film layer is formed by a polymeric material formed by a three-dimensional stacking of spherical polymer structures abutting one another tightly.