An exemplary point light source (20) includes a light emitting body (230),
and a light guide portion (210) adjacent the light emitting body. The
light emitting body includes an illuminating portion configured for
providing light beams, and a shell packaging the illuminating portion.
The light guide portion is configured for guiding the light beams to
propagate in desired directions. A size of a cross-section of the light
guide portion far away from the light emitting body is less than a size
of a cross-section of the light guide portion adjacent to the light
emitting body. A backlight module (200) using the point light source is
also provided.