Abstract: A planar illumination device according to an embodiment includes a substrate, a first optical element, a second optical element, a third optical element, a pair of fourth and fifth optical elements, and a sixth optical element. A plurality of light sources are two-dimensionally arranged on the substrate. The first optical element is arranged at an emission side of the plurality of light sources to condense light emitted from the plurality of light sources. The second optical element is arranged at an emission side of the first optical element to tilt light distribution of the light condensed by the first optical element in a first axial direction within an emission surface. The third optical element is arranged at an emission side of the second optical element to spread the light tilted by the second optical element in the first axial direction.

Abstract: A planar illuminating device of an embodiment is a directly-under type planar illuminating device provided with a linear Fresnel lens, and comprises a plurality of light sources, and a reflector. The plurality of light sources are disposed in a linear fashion on a board, along condensing positions of the Fresnel lens. The reflector includes reflecting surfaces constituting segments surrounding each of the light sources. In a part in which the light sources cannot be disposed along the condensing position because a planar shape of a light emitting area of the planar illuminating device is an irregular shape that is not rectangular, the segment of the reflector adjacent to said part is expanded to an outer edge side of the planar illuminating device.

Abstract: A planar illumination device of an embodiment includes a substrate, a first optical element, and a second optical element. A plurality of light sources are two dimensionally disposed at the substrate. The first optical element is disposed at an emission side of the plurality of light sources, and condenses light emitted from the plurality of light sources. The second optical element inclines a light distribution of the light condensed by the first optical element with respect to the first axial direction.

Abstract: A planar illumination device according to an embodiment includes a substrate, a first optical element, a second optical element, a third optical element, a pair of fourth and fifth optical elements, and a sixth optical element. A plurality of light sources are two-dimensionally arranged on the substrate. The first optical element is arranged at an emission side of the plurality of light sources to condense light emitted from the plurality of light sources. The second optical element is arranged at an emission side of the first optical element to tilt light distribution of the light condensed by the first optical element in a first axial direction within an emission surface. The third optical element is arranged at an emission side of the second optical element to spread the light tilted by the second optical element in the first axial direction.

Abstract: A planar illumination device of an embodiment includes a substrate, a first optical element, and a second optical element. A plurality of light sources are two dimensionally disposed at the substrate. The first optical element is disposed at an emission side of the plurality of light sources, and condenses light emitted from the plurality of light sources. The second optical element inclines a light distribution of the light condensed by the first optical element with respect to the first axial direction.

Abstract: 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.

Abstract: 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.