A backlight module can include a light guiding board, a light source located at a side of the light guiding board, a package layer coupled to light guiding board, and a quantum dots layer located between the light guiding board and the package layer. The light guiding board can include a light entering face and a light exiting face. The light source is facing the light entering face of the light guiding board. The light source being is configured to provide light to the light entering face of the light guiding board. The quantum dots layer is adjacent to the light exiting face of the light guiding board. The light guiding board and the package layer cooperative define a receiving room receiving the quantum dots layer on the light guiding board.