Backlight module having a first diffuser with a haze ratio which gradually increases along two directions extending to a central region of the first diffuser and a second diffuser with a haze ratio gradually decreasing away from the light source and liquid crystal display having the same

Abstract

A liquid crystal display () includes a liquid crystal panel (); a backlight module () providing light beams to the liquid crystal panel. The backlight module includes a light guide plate () having at least one light incident surface (), and a light emitting surface () adjoining the at least one light incident surface; at least one light source () disposed adjacent to the at least one light incident surface; a prism sheet () disposed at the light emitting surface for converging light beams; and a first diffuser () disposed at the prism sheet for scattering the light beams therethrough. A haze ratio of the first diffuser changes according to the brightness differentia over a brightness distribution of the prism sheet for attaining a substantially uniform surface light beams output.