Backlight module

Abstract

A reflective back cover made of plastic material having micro cellular structures is processed by compression molding and cutting so as to have a monolithical structure. The white material of the reflective back cover reflects lights such that the back cover can be an integral component featuring multiple functions of various components. With the thickness control of the reflective back cover, a concave can be formed at the side of the back cover where a light source is contained and the concave further retains the light source and its flexible printed circuit board. With the incorporation of the reflective back cover, the thickness of the backlight module can be reduced and a reliable and repetitive manufacturing of the backlight module can be introduced.

1 . A backlight module, comprising:
 a light component for generating a light source, the light component connected to a first circuit board and comprising a light emitting surface;   a light guide plate comprising an incident surface for abutting against the light emitting surface of the light component along a first direction to receive the light source; and   a reflective back cover, for reflecting the light source emitted from the light component and the light guide plate and comprising a concave disposed on an assembling surface where the light component and the light guide plate are assembled, the first circuit board and the light component configured at the concave along a second direction, the concave positioning and retaining the light component along the first direction.   
     
     
         2 . The backlight module of  claim 1 , further comprising a frame configured at a side of the reflective back cover where the light component is assembled, the frame covering around the light component. 
     
     
         3 . The backlight module of  claim 2 , wherein the frame further comprises an extended fastening part for fastening a second circuit board of the light component. 
     
     
         4 . The backlight module of  claim 1 , wherein the reflective back cover comprises a cap structure at a side near the concave, the cap structure covering along the surfaces of the light component except for the light emitting surface. 
     
     
         5 . The backlight module of  claim 1 , wherein the reflective back cover is monolithically made of plastic material having micro cellular structures. 
     
     
         6 . The backlight module of  claim 1 , wherein the depth of the concave along the second direction is not smaller than the thickness of the first circuit board. 
     
     
         7 . The backlight module of  claim 1 , wherein the first direction is perpendicular to the second direction. 
     
     
         8 . The backlight module of  claim 1 , wherein the light component is light emitting diode. 
     
     
         9 . The backlight module of  claim 1 , wherein the reflective back cover comprises a side plate configured near a side of the concave opposite to the light guide plate, the side plate extending along the second direction and being adjacent to the light component when the light component is configured at the concave along the second direction. 
     
     
         10 . The backlight module of  claim 1 , wherein the first circuit board is a flexible printed circuit board or printed circuit board (PCB). 
     
     
         11 . A reflective back cover of a backlight module, for allowing a light component and a light guide plate of the backlight module to assemble thereunto, the light guide plate abutting against the light component along a first direction for receiving a light source of the light component, the reflective back cover comprising a concave disposed on an assembling surface where the light component and the light guide plate are assembled, the light component and a circuit board connected to the light component configured at the concave along a second direction, the concave positioning and retaining the light component along the first direction. 
     
     
         12 . The reflective back cover of  claim 11 , wherein the reflective back cover is monolithically made of plastic material having micro cellular structures. 
     
     
         13 . The reflective back cover of  claim 11 , wherein the reflective back cover comprises a cap structure at a side near the concave, the cap structure covering along the surfaces of the light component except for the light emitting surface. 
     
     
         14 . A display device, comprising:
 a backlight module as claimed in  claim 1 ;   an optical film assembled along the second direction to the light guide plate;   a frame configured at a side of the reflective back cover where the light component is assembled, the frame covering around the light component; and   a panel module assembled on the reflective back cover.   
     
     
         15 . The display device of  claim 14 , wherein the frame further comprises an extended fastening part for fastening a second circuit board of the light component. 
     
     
         16 . The display device of  claim 14 , wherein the reflective back cover comprises a cap structure at a side near the concave, the cap structure covering along the surfaces of the light component except for the light emitting surface. 
     
     
         17 . The display device of  claim 14 , wherein the reflective back cover is monolithically made of plastic material having micro cellular structures. 
     
     
         18 . The display device of  claim 14 , wherein the depth of the concave along the second direction is not smaller than the thickness of the first circuit board. 
     
     
         19 . The display device of  claim 14 , wherein the first direction is perpendicular to the second direction. 
     
     
         20 . The display device of  claim 14 , wherein the reflective back cover comprises a side plate configured near a side of the concave opposite to the light guide plate, the side plate extending along the second direction and being adjacent to the light component when the light component is configured at the concave along the second direction.