Backlight Module with Low Electromagnetic Interference and Display Device Using the Same

Abstract

A display device includes a display panel, an electromagnetic touch panel, and a backlight module overlapping one another. The backlight module has a light guide plate and a light source module consisting of a flexible circuit board strip. The flexible circuit board strip includes a light source section and a signal transmission section extending along a light entrance edge and a side edge adjacent to the light entrance edge of the light guide plate, respectively. Two ends of a connection section are connected to the light source section and the signal transmission section, respectively. The connection section includes at least one first fold making the light source disposing plane of the light source section and the wiring disposing plane of the signal transmission section be non-coplanar and also makes the wiring disposing plane be parallel to the plane of the side edge of the light guide plate.

What is claimed is: 
     
         1 . A backlight module, comprising:
 a light guide plate having a light entrance edge and a side edge adjacent to each other; and   a light source module comprising:
 a flexible circuit board strip having:
 a light source section having a light source disposing plane and extending along the light entrance edge; 
 a connection section connected to one end of the light source section; and 
 a signal transmission section extending along the side edge of the light guide plate, wherein the signal transmission section has a wiring disposing plane parallel to a plane of the side edge of the light guide plate, one end of the signal transmission section is connected to the connection section; 
 wherein the connection section includes a first fold and a second fold making a portion of the wiring disposing plane parallel to the plane of the side edge of the light guide plate and the light source disposing plane are non-coplanar and include at least one angle, before the first fold and the second fold are formed, the light source section, the connection section, and the signal transmission section are disposed collinearly, and the light source disposing plane and the wiring disposing plane are coplanar; and 
 
 a plurality of light sources, disposed along an extending direction of the light source section on the light source disposing plane, for emitting light towards the light entrance edge. 
   
     
     
         2 . A backlight module, comprising:
 a light guide plate having a light entrance edge and a side edge adjacent to each other; and   a light source module comprising:
 a flexible circuit board strip having:
 a light source section having a light source disposing plane and extending along the light entrance edge; 
 a connection section having a first end and a second end, wherein the first end is connected to one end of the light source section; and 
 a signal transmission section extending along the side edge of the light guide plate, wherein the signal transmission section has a wiring disposing plane parallel to a plane of the side edge of the light guide plate, one end of the signal transmission section is connected to the second end of the connection section; 
 wherein the connection section has a first fold and a second fold, part of the connection section between the first fold and the second fold and the light source disposing plane are non-coplanar and include a first angle, the second fold makes the wiring disposing plane and the light source disposing plane include a second angle, and an extending direction of the signal transmission section is parallel to the light source disposing plane, before the first fold and the second fold are formed, the light source section, the connection section, and the signal transmission section are disposed collinearly, and the light source disposing plane and the wiring disposing plane are coplanar; and 
 
 a plurality of light sources, disposed along an extending direction of the light source section on the light source disposing plane, for emitting light towards the light entrance edge. 
   
     
     
         3 . A display device, comprising:
 a display panel;   an electromagnetic touch panel overlapping the display panel and having a first side and a second side adjacent to each other; and   a backlight module, disposed between the display panel and the electromagnetic touch panel, for providing light to the display panel, the backlight module including:
 a light source module comprising:
 a flexible circuit board strip having:
 a light source section having a light source disposing plane and extending along the first side of the electromagnetic touch panel; 
 a connection section connected to one end of the light source section; and 
 a signal transmission section extending along the second side of the electromagnetic touch panel, wherein the signal transmission section has a wiring disposing plane parallel to a plane of the second side, one end of the signal transmission section is connected to the connection section; 
 wherein the connection section has a first fold and a second fold making a portion of the wiring disposing plane parallel to the plane of the second side and the light source disposing plane are non-coplanar and include at least one angle, before the first fold and the second fold are formed, the light source section, the connection section, and the signal transmission section are disposed collinearly, and the light source disposing plane and the wiring disposing plane are coplanar; and 
 
 a plurality of light sources disposed along an extending direction of the light source section on the light source disposing plane. 
 
   
     
     
         4 . The display device of  claim 3 , wherein the at least one angle includes a first angle and a second angle, so that part of the connection section between the first fold and the second fold and the light source disposing plane are non-coplanar and include the first angle, the second fold makes the wiring disposing plane and the light source disposing plane include the second angle, and an extending direction of the signal transmission section is parallel to the light source disposing plane. 
     
     
         5 . The display device of  claim 4 , wherein the light source disposing plane is perpendicular to a plane of the first side of the electromagnetic touch panel. 
     
     
         6 . The display device of  claim 4 , wherein the part of the connection section between the first fold and the second fold is parallel to the wiring disposing plane and partially overlaps the wiring disposing plane. 
     
     
         7 . The display device of  claim 4 , wherein a fold line of the second fold is inclined along the wiring disposing plane to form an inclined angle with respect to the extending direction of the signal transmission section. 
     
     
         8 . The display device of  claim 4 , wherein a fold line of the first fold is perpendicular to the extending direction of the light source section, and a fold line of the second fold is inclined along the wiring disposing plane to form an inclined angle with respect to a normal to the light source disposing plane. 
     
     
         9 . The display device of  claim 3 , wherein an extending direction of the signal transmission section be parallel to a normal to the light source disposing plane. 
     
     
         10 . The display device of  claim 9 , wherein before the at least one fold is formed, the light source section, the connection section, and the signal transmission section are disposed collinearly, the light source disposing plane and the wiring disposing plane are coplanar. 
     
     
         11 . The display device of  claim 9 , wherein the light source disposing plane is parallel to a plane of the first side of the electromagnetic touch panel. 
     
     
         12 . The display device of  claim 10 , further comprising a signal connection section connected to the other end of the signal transmission section, wherein the signal connection section includes a signal connection plane perpendicular to the light source disposing plane. 
     
     
         13 . The display device of  claim 12 , wherein the signal connection plane is parallel to the electromagnetic touch panel. 
     
     
         14 . The display device of  claim 12 , wherein a connection region of the signal connection section and the signal transmission section includes a third fold and a fourth fold, part of the flexible circuit board strip between the third fold and the fourth fold parallelly overlaps the wiring disposing plane and is substantially perpendicular to the signal connection plane. 
     
     
         15 . The display device of  claim 14 , wherein a fold line of the third fold is inclined along wiring disposing plane to form an inclined angle with respect to an extending direction of the signal transmission section. 
     
     
         16 . The display device of  claim 14 , wherein a fold line of the fourth fold is parallel to an extending direction of the signal transmission section.