Backlight module and liquid crystal display

摘要

The invention discloses a backlight module and liquid crystal display device. The backlight module of liquid crystal display device includes: a back plate and a diffuser disposed opposite to back plate; backlight module further comprising a plurality of light-emitting units, disposed between back plate and diffuser; each of light-emitting units comprising a light-guiding strip, fixed to back plate and light source, fixed and disposed on back plate opposite to one end of light-guiding strip; wherein light-guiding strip comprising a light-emitting surface and a bottom surface, disposed oppositely to each other; light-emitting surface having an arc cross-section and a top being convex facing bottom surface; light-emitting surface being for uniformly diffusing incident light from light source. Through disposing light-guiding strips for diffusing incident light from light source, the invention can achieve higher luminance with less number of light sources and reduce cost.

主权项

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.