A backlight module, comprising: a light guide plate, LGP, comprising an incident surface, an emergent surface, and a reflective surface; a reflecting plate arranged on the reflective surface of the LGP to reflect light rays transmitted by the LGP to the emergent surface of the LGP; a diffuser configured as a plate and arranged on the emergent surface of the LGP to diffuse emergent light of the LGP; a prismatic lens group arranged on an emergent surface of the diffuser; and a light source arranged on the incident surface of the LGP; wherein the backlight module is further comprising a rim tape layer arranged around the emergent surface of the LGP; a flexible printed circuit board electrically connected to the light source to control the light source, wherein the flexible printed circuit board is arranged between the light source and the rim tape layer; a sealant arranged on an outside of the light source, wherein a first side of the sealant is fixed to an edge of the reflecting plate, and a second side of the sealant is fixed to an edge of the rim tape layer; and a shading layer configured to avoid light rays entering the prismatic lens group emitted from a side of the diffuser by being arranged between the diffuser and the rim tape layer, and by being arranged on an outside of the prismatic lens group, wherein the shading layer furthermore is disposed at the portion of the diffuser facing the light source and wherein the shading layer comprises a middle portion and side portions spaced apart from the middle portion, the length of the middle portion being greater than the lengths of the side portions, wherein the length of the middle portion and the lengths of the side portions are measured along the side of the diffuser close to the light source, and two sides of the side portions being fixed to the diffuser and the rim tape layer, respectively, and only one side of the middle portion of the shading layer being fixed to the rim tape layer, and the opposite side of the middle portion of the shading layer is in a movable state with respect to the diffuser, since the middle portion is not adhered and is not fixed to the diffuser. a light guide plate, LGP, comprising an incident surface, an emergent surface, and a reflective surface; a reflecting plate arranged on the reflective surface of the LGP to reflect light rays transmitted by the LGP to the emergent surface of the LGP; a diffuser configured as a plate and arranged on the emergent surface of the LGP to diffuse emergent light of the LGP; a prismatic lens group arranged on an emergent surface of the diffuser; and a light source arranged on the incident surface of the LGP; wherein the backlight module is further comprising a rim tape layer arranged around the emergent surface of the LGP; a flexible printed circuit board electrically connected to the light source to control the light source, wherein the flexible printed circuit board is arranged between the light source and the rim tape layer; a sealant arranged on an outside of the light source, wherein a first side of the sealant is fixed to an edge of the reflecting plate, and a second side of the sealant is fixed to an edge of the rim tape layer; and a shading layer configured to avoid light rays entering the prismatic lens group emitted from a side of the diffuser by being arranged between the diffuser and the rim tape layer, and by being arranged on an outside of the prismatic lens group, wherein the shading layer furthermore is disposed at the portion of the diffuser facing the light source and wherein the shading layer comprises a middle portion and side portions spaced apart from the middle portion, the length of the middle portion being greater than the lengths of the side portions, wherein the length of the middle portion and the lengths of the side portions are measured along the side of the diffuser close to the light source, and two sides of the side portions being fixed to the diffuser and the rim tape layer, respectively, and only one side of the middle portion of the shading layer being fixed to the rim tape layer, and the opposite side of the middle portion of the shading layer is in a movable state with respect to the diffuser, since the middle portion is not adhered and is not fixed to the diffuser.