The invention discloses a backlight module and an LED. The LED at least comprises a package body and a light emitting chip which is arranged in the package body. Generally, the package body is a half ellipsoid and is provided with an elliptic bottom surface and an ellipsoidal curved surface. The ellipsoidal bottom surface is provided with a relative semi-major axis and a relative semi-minor axis.The ellipsoidal curved surface surrounds and is adjacent to the edge of the ellipsoidal bottom surface, and the maximum vertical interval of the ellipsoidal curved surface and the bottom surface is between the relative semi-major axis and the relative semi-minor axis. By adopting the LED, the optical field has wide-angle radiation effect along the direction of the relative semi-major axis; therefore the probability of dark band is reduced. In addition, the optical field has convergence phenomenon along the direction of the relative semi-minor axis, thus light leak caused by light shining on the outer edge of a light guide plate is also reduced.