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

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.

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.