Planar light-emitting unit

A planar light-emitting unit comprising:

• a plurality of surface light-emitting portions obtained by arraying light-emitting surfaces so as to be aligned in a plane shape, and configured to emit light toward a visible side;
• a light guide member arranged in a manner facing the light-emitting surfaces of the plurality of surface light-emitting portions adjacent to each other and configured to transmit light emitted from the surface light-emitting portions;
• and
• a diffusion member provided on an opposite side of the surface light-emitting portions interposing the light guide member, and configured to diffuse, toward a visible side, the light having passed through the light guide member, wherein
• each of the plurality of surface light-emitting portions includes a light emission region configured to emit light and a non-light emission region located on an outer periphery of the light emission region and configured not to emit light,
• a non-space region not formed with a space between the light guide member and the diffusion member is provided in a region corresponding to the non-light emission region such that a space is formed in a region corresponding to the light emission region between the light guide member and the diffusion member, and
• the non-space region includes a protruding region extending to the light emission region from the non-light emission region, and in the case of defining, as Δ, a protruding amount from the non-light emission region, a following conditional expression (1) is fulfilled:
• 0<Δ≦2d×tan θ (1)
• Δ:
• protruding amount from non-light emission region of the non-space region (mm)
• d:
• thickness of light guide member (mm)
• θ:
• total reflection critical angle between light guide member and air.