Backlight lamp bar, backlight module and display device

A backlight lamp bar, comprising:

• a flexible circuit board;
• and
• a backlight source and a button light source, both being provided on the flexible circuit board,
• wherein the backlight source and the button light source are located on two opposite faces of the flexible circuit board perpendicular to a thickness direction thereof, respectively;
• wherein the backlight lamp bar further comprises a light guide film located at a light-emergent side of the button light source, and a sealing frame is provided at a periphery of the backlight lamp bar;
• wherein at least one end of the flexible circuit board on which the button light source is provided is arranged to bend towards a side of the flexible circuit board facing away from the backlight source, a barrier wall is provided at portions of the sealing frame being aligned with ends of the backlight lamp bar in a lengthwise direction of the backlight lamp bar, and the barrier wall is provided with a notch;
• and
• wherein at least one end of the flexible circuit board on which the button light source is provided is arranged to be in contact with an external side of the barrier wall such that the light emergent side of the button light source extends into an inner side of the barrier wall through the notch and faces towards the light-incident surface of the light guide film.