Patent ID: 9207391
Filing Date: 2015-12-08
Classification: G02B,G02F

Abstract:
1. A backlight module, which comprises a back plate and a diffuser disposed opposite to the back plate; the backlight module further comprising a plurality of light-emitting units disposed between the back plate and the diffuser; each of the plurality of light-emitting units comprising an elongated light-guiding strip fixed to the back plate and a light source fixed and disposed on the back plate; the elongated light-guiding strip comprising a light-emitting surface, a bottom surface opposite to the light-emitting surface, and an end surface connecting the light-emitting surface with the bottom surface and being as a light-incident surface; the light source being disposed opposite to the end surface, the light-emitting surface having an arc cross-section and a top being convex facing the bottom surface; the light-emitting surface being for uniformly diffusing incident light from the light source; wherein a cross-section of the elongated light-guiding strip is symmetrical with respect to the perpendicular bisector of a bottom edge of the cross-section, and in the cross-section of the elongated light-guiding strip, the light-emitting surface comprises a first segment, a second segment, a third segment and a fourth segment successively connected with one another in that order and disposed between the bottom edge and the perpendicular bisector; the first segment is a straight line connected with and perpendicular to the bottom edge; the second segment, the third segment and the fourth segment are smooth arcs; the second segment is convex facing away the bottom edge, the third segment is convex facing away the bottom edge, and the fourth segment is concave facing the bottom edge; a circle center of the second segment is located on the bottom edge, a circle center of the third segment and a circle center of the fourth segment both are distant from the cross-section and respectively are located at different sides of the cross-section.