A light guide plate (300) includes a light incidence surface (310) for receiving light beams, a light-emitting surface (320) for guiding light beams out of the light guide plate, and a bottom surface (330) reflecting and scattering light beams in directions toward the light-emitting surface. The bottom surface includes scattering-dots (341), and a predetermined region of the bottom surface also includes sub-scattering-dots (342). At least one sub-scattering-dot is disposed around each scattering-dot. The sub-scattering-dots are smaller than the scattering-dots. With this micro-configuration, intensities of light beams output from the light guide plate are uniform and bright.