Patent ID: 7824094
Filing Date: 2010-11-02
Classification: G02B

Abstract:
1. A backlight module comprising: a first light source, a second light source, and a light guide plate, comprising: a light incident surface, the two light sources positioned adjacent to the light incident surface, and a bottom surface adjacent to the light incident surface, the bottom surface defining a plurality of first recesses arranged in a first matrix and a plurality of second recesses arranged in a second matrix, the two matrixes defined by a plurality of imaginary grid lines at the bottom surface, the imaginary grid lines comprising a plurality of first imaginary grid lines parallel to each other and extending along a first direction, a plurality of second imaginary grid lines parallel to each other and extending along a second direction orthogonal to the first direction, and a plurality of third imaginary grid lines parallel to each other and extending along the second direction, the second imaginary grid lines and the third imaginary grid lines being arranged alternately, each first recess defining a first slant and a first arris at a top of the first slant, the first arris of the first slant at each first recess being aligned substantially perpendicular to a main path of light beams that propagate from the first light source to the first recess, each second recess defining a second slant and a second arris at a top of the second slant, the second arris of the second slant at each second recess being aligned substantially perpendicular to a main path of light beams that propagate from the second light source to the second recess, wherein lengths of the first arrises of the first recesses and the second recesses in the same first imaginary grid line are the same, lengths of the first arrises of the first recesses in the same second imaginary grid line progressively increase with increasing distance away from the first light source, lengths of the second arrises of the second recesses in the same third imaginary grid line progressively increase with increasing distance away from the second light source, the first recesses are arranged at intersections of the first imaginary grid lines and the second imaginary grid lines, and the second recesses are arranged at intersections of the first imaginary grid lines and the third imaginary grid lines.