Abstract: A liquid crystal display device 700 has a liquid crystal panel 701 and a backlight module 70 under the liquid crystal panel for providing light beams to the liquid crystal panel. The backlight module includes at least one light source 720, and a light guide plate 711. The light guide plate has an incident surface 710 for receiving light beams from the at least one light source, an emitting surface 712 adjacent the incident surface, and a bottom surface 713 opposite to the emitting surface, at least one brightness enhancing pattern being provided at the bottom surface. The at least one brightness enhancing pattern has a plurality of brightness enhancing element 714, each of which is an arcuate and generally subtending the at least one light source.

Abstract: A liquid crystal display device (700) has a liquid crystal panel (701) and a backlight module (70) under the liquid crystal panel for providing light beams to the liquid crystal panel. The backlight module includes at least one light source (720), and a light guide plate (711). The light guide plate has an incident surface (710) for receiving light beams from the at least one light source, an emitting surface (712) adjacent the incident surface, and a bottom surface (713) opposite to the emitting surface, at least one brightness enhancing pattern being provided at the bottom surface. The at least one brightness enhancing pattern has a plurality of brightness enhancing element (714), each of which is an arcuate and generally subtending the at least one light source.

Abstract: A light guide plate (2) includes a light output surface (20) and a bottom surface (22) opposite to the light output surface. The bottom surface defines a plurality of V-shaped grooves (221) thereat, and each of the V-shaped grooves is bounded by a pair of walls along a length thereof. The walls cooperatively form an apex angle, and each of the V-shaped grooves has an apex angle in a range of 67° to 85°. With such configuration, light beams input to the light guide plate can be directed and transmitted within the light guide plate toward particular desired directions. Such directions are typically directions toward a viewer of an associated liquid crystal display panel. Accordingly, a backlight module that employs the light guide plate may advantageously obtain more efficient utilization of illumination and greater brightness in particular desired directions.