The invention relates to the technical field of display, and in particular relates to a backlight device, a
display device and an LED
light source group switching method thereof. The backlight moduleat least comprises a
light guide plate, a light bar base plate and
multiple quantum dot
layers, wherein the light bar base plate is arranged on the light entering side of the
light guide plate, the light bar base plate comprises a first LED
light source group and a second LED
light source group which are selectively lighted corresponding to different color range display states, the
quantum dot
layers are arranged on the light entering side of the
light guide plate, when the first LED light source group is lighted, light rays emitted by the first LED light source group can enter the light guideplate after dropping into the
quantum dot
layers, and when the second LED light source group is lighted, light rays emitted by the second LED light source group directly enter the light guide plate without passing through the
quantum dot layers; and therefore, a user can freely switch between a
high color range display state and a conventional color range display state according to different needs, and the function and market competitiveness of the product can be enhanced.