Abstract: According to one embodiment, an illumination device, in which a plurality of light guides include a plurality of light guide pairs, each of the plurality of light guide pairs includes a first light guide and a second light guide, the plurality of light guide pairs are connected with their long sides opposed to each other, a plurality of laser light source elements include a plurality of first light source elements arranged to be opposed to a first side surface on a short side of the first light guide of the light guide pair, and a plurality of second light source elements arranged to be opposed to a second side surface of the second light guide of the light guide pair.

Abstract: According to one embodiment, a display device includes a display panel configured to emit display light of linearly polarized light, a first semi-transparent element transmitting first circularly polarized light and reflecting second circularly polarized light, a first retardation film, a second semi-transparent element reflecting the first circularly polarized light and transmitting the second circularly polarized light, a second retardation film having a refractive anisotropy in which refractive indexes of directions orthogonal to each other in a plane are substantially equivalent to each other and a refractive index in a normal is different from a refractive index in a plane, and a first element having a lens action of condensing the second circularly polarized light.

Abstract: According to one embodiment, a liquid crystal display device includes a display panel including a red sub-pixel, a green sub-pixel and a blue sub-pixel and an illumination device including a red light-emitting element, a green light-emitting element and a blue light emitting element and irradiating a mixture of light emitted by the light emitting elements onto the display panel. Further, of the red sub-pixel, the green sub-pixel and the blue sub-pixel, an aperture area of a sub-pixel having a lowest wall plug efficiency of the light emitting element of a respective color is greater than aperture areas of the sub-pixels of other colors.

Abstract: According to one embodiment, an illumination device includes a first light guide including a first main surface, a second main surface, a first side surface and a second side surface, a first light source and a first layer including a first prism provided on the second side surface. The first prism protrudes from the second main surface toward the opposite side to the first main surface and has a cross-sectional shape of a triangle with a first slope and a second slope. The incident angle of light emitted from the first light source and entering the first light guide from the second side surface, the angle between the first slope and the first direction, and the angle between the first slope and the second slope are set to values that satisfy the predetermined conditions, respectively.

Abstract: According to one embodiment, a display device including a display panel configured to emit display light of linear polarization, a first retardation plate, a second retardation plate, a reflective polarizer configured to pass first linear polarized light, and to reflect second linear polarized light, a transflective layer including a concave surface opposed to the second retardation plate, and a transparent solid with almost zero refractive anisotropy, wherein the first retardation plate and the second retardation plate are a quarter-wave plate, and the transparent solid includes a first surface shaped convex to be opposed to the concave surface, and a second surface opposed to the reflective polarizer.

Abstract: According to one embodiment, an illumination device includes a light guide having a first plane, a second plane, a side plane, a first tilted plane, and a second tilted plane, an angle formed between the side plane and the first tilted plane and an angle formed between the side plane and the second tilted plane being acute angles, a first semiconductor laser element including a first light emitting part, and a second semiconductor laser element including a second light emitting part. The first light emitting part is opposed to a first intersection part of the side plane and the first tilted plane, and the second light emitting part is opposed to a second intersection part of the side plane and the second tilted plane.

Abstract: According to an embodiment, an illumination device includes a light guide having a first plane, a second plane opposed to the first plane and substantially parallel to the first plane, and a tilted plane opposed to the first plane and tilted to the first plane, the tilted plane and the second plane being arranged in a first direction, and a light emitting device including a first light emitting part, a second light emitting part, and a third light emitting part which are located directly below the tilted plane, arranged in the first direction, and configured to emit light having wavelengths different from each other.

Abstract: According to one embodiment, a display device includes a display panel configured to emit display light of linearly polarized light, a first semi-transparent element transmitting first circularly polarized light and reflecting second circularly polarized light, a first retardation film, a second semi-transparent element reflecting the first circularly polarized light and transmitting the second circularly polarized light, a second retardation film having a refractive anisotropy in which refractive indexes of directions orthogonal to each other in a plane are substantially equivalent to each other and a refractive index in a normal is different from a refractive index in a plane, and a first element having a lens action of condensing the second circularly polarized light.

Abstract: According to one embodiment, a display device including a display panel emitting display light of linearly polarized light, a semi-transparent layer, a first retardation film, a reflective polarizer transmitting first linearly polarized light and reflecting second linearly polarized light orthogonal to the first linearly polarized light, a second retardation film, an element, and a third retardation film arranged between the reflective polarizer and the element, wherein the first retardation film, the second retardation film, and the third retardation film are quarter-wave plates, and the element has a lens action of condensing first circularly polarized light.

Abstract: According to one embodiment, a display device including a display panel configured to emit display light of linear polarization, a first retardation plate, a second retardation plate, a reflective polarizer configured to pass first linear polarized light, and to reflect second linear polarized light, a transflective layer including a concave surface opposed to the second retardation plate, and a transparent solid with almost zero refractive anisotropy, wherein the first retardation plate and the second retardation plate are a quarter-wave plate, and the transparent solid includes a first surface shaped convex to be opposed to the concave surface, and a second surface opposed to the reflective polarizer.

Abstract: According to one embodiment, the illumination device includes a first area, a second area, a first light guide, a plurality of first light sources, a second light guide, a plurality of second light sources, a first layer and a second layer. The first layer extends from the first area over a boundary between the first area and the second area, to between a second side surface of the first light guide and the boundary. The second layer extends from the second area over the boundary to between a third side surface of the second light guide and the boundary.

Abstract: According to one embodiment, a display device displays a color gamut defined by connecting a first defined color in first chromaticity coordinates, a second defined color in second chromaticity coordinates, and a third defined color in third chromaticity coordinates. An illumination device of the display device includes green, blue and red lasers. The green and blue lasers emit light of the second and third defined colors, and red laser emits light of a color in fourth chromaticity coordinates. Each of the pixels displays a color including the first defined color by mixing light in the fourth chromaticity coordinates and the second defined color.

Abstract: According to one embodiment, the illumination device includes a first area, a second area, a first light guide, a plurality of first light sources, a second light guide, a plurality of second light sources, a first layer and a second layer. The first layer extends from the first area over a boundary between the first area and the second area, to between a second side surface of the first light guide and the boundary. The second layer extends from the second area over the boundary to between a third side surface of the second light guide and the boundary.

Abstract: According to one embodiment, the illumination device includes a first area, a second area, a first light guide, a plurality of first light sources, a second light guide, a plurality of second light sources, a first layer and a second layer. The first layer extends from the first area over a boundary between the first area and the second area, to between a second side surface of the first light guide and the boundary. The second layer extends from the second area over the boundary to between a third side surface of the second light guide and the boundary.

Abstract: According to one embodiment, the illumination device includes a first area, a second area, a first light guide, a plurality of first light sources, a second light guide, a plurality of second light sources, a first layer and a second layer. The first layer extends from the first area over a boundary between the first area and the second area, to between a second side surface of the first light guide and the boundary. The second layer extends from the second area over the boundary to between a third side surface of the second light guide and the boundary.

Abstract: According to one embodiment, a display device displays a color gamut defined by connecting a first defined color in first chromaticity coordinates, a second defined color in second chromaticity coordinates, and a third defined color in third chromaticity coordinates. An illumination device of the display device includes green, blue and red lasers. The green and blue lasers emit light of the second and third defined colors, and red laser emits light of a color in fourth chromaticity coordinates. Each of the pixels displays a color including the first defined color by mixing light in the fourth chromaticity coordinates and the second defined color.

Abstract: In one embodiment, an illumination device includes a light guide, a light source and prisms. The light guide has a side surface and first and second main surfaces. The light source emits light to the side surface in a first emission direction. The prisms are provided on the second main surface. The second main surface has first and second areas. The prisms include first prisms in the first area and second prisms in the second area. A first virtual line connecting apexes of the first prisms is inclined with respect to the first main surface. A distance between the second area and the first main surface is greater than a distance between the first area and the first main surface.

Abstract: According to one embodiment, an illumination device includes a first member, a second member, a first light source. The first member includes a first prism array including first prisms aligned in a first direction. The second member includes a second prism array including second prisms aligned in a second direction. The second member disposed more closely to a first A side than to the first member. The first light source disposed more closely to a second A side than to the second member to apply a parallel light beam to a second B side. The parallel light beam from the first light source is made incident on the second prism array and incident on the first prism array without passing through a light guide.

Abstract: According to one embodiment, a semiconductor laser includes a semiconductor laser element. A drive current which is composed of a direct current and an alternating current superposed thereon is applied to the semiconductor laser element. A waveform of the alternating current is a non-square wave. A frequency of the alternating current is from 50 Hz to 500 kHz.

Abstract: According to one embodiment, a display device includes a display panel including a first substrate, a second substrate, and an optical element layer provided between the substrates, a light directing unit facing the first substrate of the display panel, and including a first main surface disposed on a side facing the first substrate, and a second main surface disposed on a side reverse to the first main surface, and a light source unit disposed on the first substrate side with respect to the display panel, and emitting polarized light toward the first or second main surface. The polarized light is made incident on the first or second main surface, and directed perpendicularly to the optical element layer.