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.