US Patent 11175016 Planar illumination device with spacer between lens and diffuser

A planar illumination device includes a light source substrate, a lens, a diffuser, and a spacer. The light source substrate includes a plurality of light-emitting devices two-dimensionally arrayed thereon. The lens receives light emitted from the light source substrate. The diffuser receives light emitted from the lens. The spacer is integrated with the diffuser and disposed between the lens and the diffuser.