Backlight module and LCD device
View Patent ↗A backlight module is disclosed, which comprises a light guide plate, a point light source and a substrate. The light guide plate comprises a top surface and a bottom surface opposite to each other and a side surface located between the top surface and the bottom surface. The point light source is disposed on the substrate. The backlight module further comprises a backplate, a front frame and a first reflective unit. The backplate is adapted to accommodate the light guide plate. The front frame is disposed adjacent to the top surface of the light guide plate. The point light source is disposed adjacent to the side surface. A bisector line of a light emitting range of the point light source is directed towards a plane in which the top surface or the bottom surface of the light guide plate is located.
1. A side-typed backlight module, comprising a light guide plate, a point light source and a substrate, the light guide plate comprising a top surface and a bottom surface opposite to each other and a side surface connecting the top surface and the bottom surface, and the point light source being disposed on the substrate, wherein the backlight module further comprises a backplate and a first reflective unit, the backplate is adapted to accommodate the light guide plate, the point light source is disposed beside the side surface, a bisector line of a light emitting range of the point light source is directed towards a plane in which the top surface of the light guide plate is located, and the first reflective unit is disposed outside the light guide plate, separated from the light guide plate, and adapted to reflect light beams emitted from the point light source into the light guide plate via the side surface, the light guide plate receives the light beams from the side surface and emits the light beams from the top surface thereof, a top portion of the first reflective unit is located between the bottom surface of the light guide plate and a bisector plane of the light guide plate, and the bisector plane of the light guide plate is parallel to the top surface of the light guide plate and located at a half thickness of the light guide plate, the top portion of the first reflective unit is in contact with the side surface of the light guide plate to prevent the light beams emitted from the point light source from leaking, and the point light source comprises a bottom portion below the bottom surface of the light guide plate and a top portion slightly higher than the bottom surface of the light guide plate.
2. The backlight module of claim 1 , wherein the bisector line of the light emitting range of the point light source is parallel to or includes an acute angle with a plane in which the side surface of the light guide plate is located.
3. The backlight module of claim 1 , wherein the substrate comprises a printed circuit board (PCB) and an aluminum extruded piece in contact with each other, and the point light source and the aluminum extruded piece are located at two opposite sides of the PCB respectively.
4. The backlight module of claim 1 , wherein the backplate is a metal backplate.