According to one embodiment, a display device includes a display panel, a first light guide, and a second light guide. In the first light guide, a first main surface includes a first plane and first grooves between the first plane and a first side surface, a second main surface includes second grooves orthogonal to the first grooves, and a second plane between the second grooves and the first side surface. In the second light guide, a third main surface includes a third plane and third grooves located between the third plane and a fourth side surface, a fourth main surface includes fourth grooves orthogonal to the third grooves, and a fourth plane located between the fourth grooves and the fourth side surface.

One embodiment provides an apparatus for displaying an image comprising: a first optical substrate comprising at least one waveguide layer configured to propagate light in a first direction, wherein the at least one waveguide layer of the first optical substrate comprises at least one grating lamina configured to extract the light from the first substrate along the first direction; and a second optical substrate comprising at least one waveguide layer configured to propagate the light in a second direction, wherein the at least one waveguide layer of the second optical substrate comprises at least one grating lamina configured to extract light from the second substrate along the second direction; wherein the at least one grating lamina of at least one of the first and second optical substrates comprises an SBG in a passive mode.

An illuminating unit includes: a plurality of light sources; a light-guide plate including an end surface disposed to face the plurality of light sources, a first surface that outputs light which is based on incident light from the end surface, and a second surface that faces the first surface and includes a plurality of convex parts; and an optical sheet adhered to side of the second surface of the light-guide plate, with the plurality of convex parts being interposed therebetween. The plurality of convex parts include a plurality of first convex parts disposed in a first region inside the second surface, and one or plurality of second convex parts disposed in at least a portion of a second region on a periphery of the first region inside the second surface.

According to one embodiment, a display device includes a display panel, a first light guide, and a second light guide. In the first light guide, a first main surface includes a first plane and first grooves between the first plane and a first side surface, a second main surface includes second grooves orthogonal to the first grooves, and a second plane between the second grooves and the first side surface. In the second light guide, a third main surface includes a third plane and third grooves located between the third plane and a fourth side surface, a fourth main surface includes fourth grooves orthogonal to the third grooves, and a fourth plane located between the fourth grooves and the fourth side surface.

An optical component includes a light guide board. The light guide board can include an incident surface, an underside, and an exit surface. The incident surface is connected to the underside and the exit surface, respectively. The underside is parallel to the exit surface. Further, the exit surface includes a prism structure for refracting light in the light guide board.

Systems and methods are disclosed for a light cover that may include a blocking portion configured to block a light emitted from a light-emitting diode, the blocking portion having a first shape associated with a heated state in which the blocking portion extends vertically in parallel with a lower portion of an optical sheet, the first shape configured to minimize a gap between the lower portion of the optical sheet and the blocking portion; a mounting portion configured to contact a bottom portion of a cover bottom of the display, the mounting portion extending orthogonally from the blocking portion; and a plurality of mounting pegs disposed on interior portions of the mounting portion, each of the plurality of mounting pegs configured to removably couple the mounting portion of the light cover to the bottom portion of the cover bottom.

One embodiment provides an apparatus for displaying an image comprising: a first optical substrate comprising at least one waveguide layer configured to propagate light in a first direction, wherein the at least one waveguide layer of the first optical substrate comprises at least one grating lamina configured to extract the light from the first substrate along the first direction; and a second optical substrate comprising at least one waveguide layer configured to propagate the light in a second direction, wherein the at least one waveguide layer of the second optical substrate comprises at least one grating lumina configured to extract light from the second substrate along the second direction, wherein the at least one grating lamina of at least one of the first and second optical substrates comprises an SBG in a passive mode.

Disclosed is a lighting device of a vehicle capable of achieving an enhancement in luminous efficacy. The disclosed lighting device includes a light source for generating light, a light guide including a light emitting portion formed with first patterns arranged in a longitudinal direction of the light emitting portion, to guide the light, the light emitting portion performing light emission using the light, and a light receiving portion to receive the light generated by the light source, and a back cover, on which the light guide is mounted. The back cover is formed with second patterns arranged in a longitudinal direction of the back cover at a portion of the back cover, on which the light receiving portion is mounted. The first patterns are formed to have a greater width with increasing distance from the light source. The second patterns are formed to have the same width.

A light incidence plane of the core 15 includes a plurality of planes 15a to 15c unparalleled with each other to which a light beam emitted from at least one laser element 21 is entered. When seen on a cross section taken along the longer direction of an optical fiber 10, light beams entered to a core 15 from the inclined planes 15b and 15c inclined to an axis CA of the optical fiber 10 in the plurality of the planes 15a to 15c are propagated from a region surrounded by a line and the inclined planes 15b and 15c forming an acute angle, the line being passed through the incident points of the light beams entered to the inclined planes 15b and 15c and parallel with an axis CA.

A planar illumination apparatus according to an embodiment includes a light guide plate configured to emit, from an exit surface, light incident from a side surface, a frame including a border that encloses the light guide plate, and a plate spring provided between the light guide plate and the border and configured to press the light guide plate in a first direction and in a second direction different from the first direction.