A backlight source, comprising: a first light emitting diode, LED, light bar, a second LED light bar, a light guide plate, a reflective plate and an optical film, wherein the light guide plate includes a light exiting surface and a bottom surface disposed oppositely to each other, the optical film is attached to a light exiting surface of the light guide plate, and the reflective plate is attached to the bottom surface of the light guide plate, wherein the first LED light bar comprises a first circuit board and a plurality of first light emitting units disposed on the first circuit board and spaced evenly, the second LED light bar comprises a second circuit board and a plurality of second light emitting units disposed on the second circuit board and spaced evenly, the first circuit board and the second circuit board are disposed in parallel with each other and are disposed in parallel with the light exiting surface of the light guide plate, the first light emitting units and the second light emitting units are located between the first circuit board and the second circuit board, and the plurality of the first light emitting units and the plurality of the second light emitting units are alternately disposed in an arrangement direction of the plurality of the first light emitting units, the backlight source further comprises a frame body, the first LED light bar and the second LED light bar are all fixed on the frame body, the frame body comprises a first frame body and a second frame body, the reflective plate and the second circuit board are disposed on the first frame body, the second frame body is disposed between the first circuit board and the second circuit board, and the second frame body is disposed away from the light exiting surfaces of the first light emitting units and the second light emitting units, for supporting the first LED light bar. a first light emitting diode, LED, light bar, a second LED light bar, a light guide plate, a reflective plate and an optical film, wherein the light guide plate includes a light exiting surface and a bottom surface disposed oppositely to each other, the optical film is attached to a light exiting surface of the light guide plate, and the reflective plate is attached to the bottom surface of the light guide plate, wherein the first LED light bar comprises a first circuit board and a plurality of first light emitting units disposed on the first circuit board and spaced evenly, the second LED light bar comprises a second circuit board and a plurality of second light emitting units disposed on the second circuit board and spaced evenly, the first circuit board and the second circuit board are disposed in parallel with each other and are disposed in parallel with the light exiting surface of the light guide plate, the first light emitting units and the second light emitting units are located between the first circuit board and the second circuit board, and the plurality of the first light emitting units and the plurality of the second light emitting units are alternately disposed in an arrangement direction of the plurality of the first light emitting units, the backlight source further comprises a frame body, the first LED light bar and the second LED light bar are all fixed on the frame body, the frame body comprises a first frame body and a second frame body, the reflective plate and the second circuit board are disposed on the first frame body, the second frame body is disposed between the first circuit board and the second circuit board, and the second frame body is disposed away from the light exiting surfaces of the first light emitting units and the second light emitting units, for supporting the first LED light bar.