Planar light source device and liquid crystal display device equipped with same

A planar light source device comprising:

• a plurality of light sources, and
• a bottom plate that has a mounting surface on which the plurality of light sources are mounted, wherein
• the plurality of light sources are two-dimensionally disposed in a rectangular region of the mounting surface that is smaller than a size of the bottom plate, and disposition density of the light sources in the rectangular region is lower in a peripheral portion than in a central portion,
• the planar light source device further comprising a diffusion lens that is disposed correspondingly to each of the plurality of light sources and diffuses light emitted from the light source, wherein
• the rectangular region has, at four corners thereof, corner regions where at least one of the light sources is disposed, and
• the diffusion lens corresponding to the light source located in each of the corner regions is disposed such that a central axis thereof is located at a position closer to an outer peripheral side of the rectangular region than a light emitting portion of the light source.

A planar light source device comprising:

• a plurality of light sources, and
• a bottom plate that has a mounting surface on which the plurality of light sources are mounted, wherein
• the plurality of light sources are two-dimensionally disposed in a rectangular region of the mounting surface that is smaller than a size of the bottom plate, and disposition density of the light sources in the rectangular region is lower in a peripheral portion than in a central portion,
• the planar light source device further comprising a diffusion lens that is disposed correspondingly to each of the plurality of light sources and diffuses light emitted from the light source, wherein
• the rectangular region has, at four corners thereof, corner regions where at least one of the light sources is disposed, and
• the diffusion lens corresponding to the light source located in each of the corner regions is disposed such that a central axis thereof inclines from a direction perpendicular to the mounting surface toward an outer peripheral side of the rectangular region.