Backlight module and liquid crystal display device

A backlight module, comprising a light guide plate and a flexible circuit board, wherein an edge of the light guide plate is provided with plural light source mounting holes disposed along a thickness direction of the light guide plate;

• a light source is mounted in every light source mounting hole in such a manner that a light emitting surface of the light source is attached onto a hole wall of the light source mounting hole;
• plural groups of anode-cathode conductive parts are disposed on the flexible circuit hoard in one-to-one correspondence with the plural light source mounting holes, every group of anode-cathode conductive part is connected to an anode and a cathode of the light source respectively in a corresponding light source mounting hole, and an area of every group of anode-cathode conductive part of the plural groups of anode-cathode conductive parts is larger than that of the anode and the cathode of the light source in the corresponding light source mounting hole, wherein in a light emitting surface of the light guide plate or a bottom surface opposite to the light emitting surface, a groove is disposed between adjacent light source mounting holes, and the adjacent light source mounting holes are communicated through the groove;
• adjacent light sources are connected by a flexible connecting plate in such a manner that the flexible connecting plate is provided only between the adjacent light sources, and the flexible connecting plate is only located in and fixedly connected to the groove;
• and the flexible connecting plate is an adhesive tape;
• wherein the light source mounting hole penetrates through the light guide plate along a direction perpendicular to the light emitting surface of the light guide plate;
• and wherein the flexible circuit board and the groove are on opposite sides of the light guide plate relative to one another.