Patent ID: 7834954

Claim:
A backlight module, comprising: a light guide plate comprising one light incident surface, and a light emitting surface adjoining the light incident surface; one light source disposed adjacent to the light incident surface, the light source capable of emitting light; a prism sheet disposed above the light emitting surface for converging the light beams; a first diffuser disposed above the prism sheet for scattering the light beams, and comprising two first opposite sides and two second opposite sides that are connected to the two first opposite sides; and a second diffuser disposed above the light guide plate and below the prism sheet for scattering the light beams; wherein a haze ratio of the second diffuser gradually decreases along a direction extending away from the light source according to a brightness distribution of the light guide plate, and a haze ratio of the first diffuser gradually increases along two directions extending from each first opposite side to a central region of the first diffuser, and remains the same along two directions extending from each second opposite side to the central region of the first diffuser.