Light source device for backlight module and LED package structure of light source device

The utility model provides a light source device for a backlight module. The light source device comprises a back frame unit and a first LED package structure. The back frame unit comprises a substrate and a casing, wherein the casing is disposed on the substrate and has a first plate portion which is spaced from the substrate. Disposed between the substrate and the first plate portion, the first LED package structure comprises a first package body, a lead-wire frame unit and an illuminant crystal grain. The package body has a light emitting surface and two opposite side surfaces. The lead-wire frame unit has a first frame body, which is wrapped by the package body and is exposed to the side surfaces of the package body. A first heat conduction path is formed by the first frame body and the substrate, and a second heat conduction path is formed by the first frame body and the first plate portion. In this way, the heat induction paths between the LED package structure and the back frame unit are added, and heat-conducting pads can also be arranged between the package body and the casing.