Area light source device and flat panel display device

A flat panel display device, comprising an area light source device and a flat panel display panel disposed on a side of a rear exit plane, and the area light source device comprises:

• a light guide body comprising an incidence plane, and a front exit plane and a rear exit plane extending along two opposite sides of the incidence plane respectively;
• a light emitting body disposed along a side of the incidence plane of the light guide body;
• a structural layer disposed on a side of the rear exit plane, and used for changing a direction of light from the light guide body to the structural layer and emitting the light in a direction away from the rear exit plane;
• and
• second medium layers wrapped in the structural layer,
• wherein a refractive index of a material of the structural layer is greater than a refractive index of a material of the second medium layers.