The invention provides a backlight module, a display panel comprising the same and an electronic device. The backlight module comprises a
light guide plate, a first low-refractive
coating, a
diffusion coating, a high-refractive
coating, a second low-refractive coating, a Bragg reflective coating and light sources, wherein the
light guide plate is provided with a light-exiting surface and a light-entering surface which are opposite to each other, the first low-refractive coating is arranged on the light-exiting surface of the
light guide plate, the
diffusion coating is arranged on the upper surface of the first low-refractive coating, the high-refractive coating is arranged on the upper surface of the
diffusion coating, the second low-refractive coating is arranged on the light-entering surface of the light guide plate, the Bragg reflective coating is arranged on the lower surface of the second low-refractive coating, and the light sources are arranged on side faces of the light guide plate. According to the membrane-free backlight module with a plurality of coatings, the structure of the backlight module is greatly simplified, yield is improved, light loss is reduced, brightness is greatly improved, the thickness of the whole backlight module is only equal to that of the upper and lower coatings of the light guide plate, the backlight module can be ultra-thin, and pictures and quality of the display panel comprising the backlight module are improved.