Anti-peeping backlight module

The invention provides a peep-proof backlight module which comprises the following elements. The first light-emitting element is arranged on the upper side of the transparent substrate, and the light-emitting angle range of the first light-emitting element is larger than or equal to 30 degrees and smaller than or equal to 45 degrees. The second light-emitting element and the light guide plate are arranged on the lower side of the transparent substrate, and the second light-emitting element is arranged in the hole of the light guide plate. In the first mode, the luminous intensity of the first luminous element is first intensity, and the luminous intensity of the second luminous element is second intensity. In the second mode, the luminous intensity of the first luminous element is third intensity, the luminous intensity of the second luminous element is fourth intensity, the first intensity is smaller than the third intensity, and the second intensity is larger than the fourth intensity. Therefore, the peep-p