Abstract: A backlight unit of a display apparatus, the backlight unit includes a light source unit disposed on at least one edge of a display panel; and a light guide plate disposed at rear of the display panel. The light guide plate includes a first pattern part including a plurality of first pattern lines formed on a lower surface of the light guide plate, and which extend perpendicularly to a transmission direction of the radiated light, and which totally reflect the radiated light to an upper surface of the light guide plate, and a second pattern part including a plurality of second pattern lines formed on the upper surface of the light guide plate, and which extend parallel with the transmission direction of the radiated light, and which guide light transmitted in the light guide plate to travel and exit along the second pattern lines.

Abstract: A prism sheet having a function for preventing damage while assuring light collecting performance, and a liquid crystal display employing it. The prism sheet (6) has a first major surface on which light from a light source impinges, and a second major surface from which the incident light exits. A plurality of first prism rows (6a) having triangular cross-section are formed in parallel on the second major surface. A plurality of second prism rows (6b) having a round top and higher than the first prism rows (6a) are also provided on the second major surface.

Abstract: A light guide plate includes a light emitting surface and a micro structure positioned on the light emitting surface. The micro structure includes a plurality of pyramids projecting from the light emitting surface. Each of the pyramids includes a bottom surface and a plurality of side surfaces connected to the bottom surface. An included angle between each side surface and the bottom surface of each pyramid is in the range from about 15 degrees to about 25 degrees. An illuminating device including the light guide plate is also provided.

Abstract: An enhanced light fixture containing a volumetric diffuser to control the spatial luminance uniformity and angular spread of light from the light fixture is disclosed. The volumetric diffuser provides increased spatial luminance uniformity and efficient control over the illuminance such that power reductions, reduced cost or reduced size may be achieved. The volumetric diffuser contains one or more regions of volumetric light scattering particles. The spread of illumination of light from a light emitting source can be efficiently controlled by using a thin, low cost, volumetric, diffuser to direct the light in the desired direction. This allows the reduction in number of light sources, a reduction in power requirements, or a more tailored illumination. When the volumetric diffuser is used in combination with a waveguide to extract light, the light is efficiently coupled out of the waveguide in a thin, planar surface.

Abstract: A lighting device 12 includes at least one point light source 17, an optical member 15a provided on a light output side of the lighting device 12 from the point light source 17. The optical member 15a is formed of a member having a substantially uniform light reflectance. A first light reflecting portion 31 is formed on a portion of the optical member 15a that overlaps the point light source 17, and the first light reflecting portion 31 reflects light from the point light source 17. A second light reflecting portion 30a, 23 is provided to reflect the light that is reflected by the first light reflecting portion 31 to be directed to the first light reflecting portion 31.

Abstract: A display apparatus includes; a plurality of light sources which emit a light, a display panel which displaying an image using the light, a light guide plate which guides the light emitted from the light sources to the display panel, and a plurality of reflection members that are spaced apart from each other and coupled with a first side of the light guide plate and a second side of the light guide plate facing the first side to reflect light traveling inside the light guide plate to the first and second sides, wherein the plurality of light sources include; a plurality of first light sources, each of the plurality of first light sources being arranged corresponding to an area between two adjacent reflection members of the plurality of reflection members on the first side and a plurality of second light sources each being arranged corresponding to an area between two reflection members on the second side.

Abstract: A backlight module having a light guide plate with prismatic structures and a manufacturing method thereof are provided. The backlight module includes a light guide plate, a brightness enhancement film, and a light source module. The light guide plate includes a first surface and a second surface opposite to each other. The first surface has prismatic structures disposed side by side thereon. Each of the prismatic structures includes a first slope and a second slope being adjacent to each other and having an included angle with respect to the first surface, respectively. The included angles are equivalent. The brightness enhancement film includes a third surface and a fourth surface opposite to each other. The third surface faces the second surface. The fourth surface has prisms disposed side by side thereon along the extending direction of the prismatic structure. The brightness enhancement film has an optimum incident angle associated with an angle of the prism and corresponding to the included angles.

Abstract: According to one embodiment, a liquid crystal display includes a display module and a backlight module configured to irradiate light on the display module. The backlight module includes a light guide plate, a first light source, a reflective plate, and a second light source. The light guide plate has a light output face at a position corresponding to a first small area on the display module. The first light source is configured to irradiate light toward the light guide plate from a side of the light guide plate in such a manner that the irradiated light reaches the first small area. The reflective plate is facing to the light guide plate, and the reflective plate has a reflective face configured to reflect light toward a second small area different from the first small area. The second light source is configured to irradiate light toward the reflective plate from a side of the reflective plate in such a manner that the irradiated light reaches the second small area.

Abstract: A backlight unit (3) provided with a LED package (light source) (11) and a light guide plate (14) includes a light-emitting portion (12) that is provided on the light guide plate side of the LED package (11) so as to be opposed to an incident surface (14a) of the light guide plate (14) and outputs light from the LED package (11) toward the light guide plate (14). A dimension on the incident surface side of the light-emitting portion (12) in a thickness direction of the light guide plate (14) is not more than a dimension at the incident surface (14a) of the light guide plate (14) in its thickness direction, and the light-emitting portion (12) uses a two-dimensional photonic crystal (12a).

Abstract: Disclosed are an optical sheet, which includes a prism pattern having condensing axes crossing each other in diagonal directions with respect to an arrangement direction of light sources, thereby achieving an enhanced contrast ratio without a reduction in viewing angle and an increase in costs, and a backlight unit using the same. The optical sheet includes a plurality of crossed prism patterns each having a first condensing axis and a second condensing axis crossing each other in diagonal directions with respect to an arrangement direction of a light source.

Abstract: An optical substrate possesses a structured surface that enhances luminance or brightness and reduces the effects of structural defects on perceived image quality. User perceivable image cosmetic defects caused by manufacturing or handling, can be masked by introducing structural irregularities in the optical substrate, which may be non-facet flat sections or in-kind to the defects. Optical defects caused by non-facet flat sections in the prism structure of the optical substrate (e.g., flat-bottom valleys with a certain valley bottom thickness above the base layer, and/or flat-top peaks, and/or openings in the optical substrates that expose flat sections of underlying base layer) can be masked by providing distributed in-kind non-facet flat sections (e.g., flat-bottom valleys, and/or flat-top peaks, and/or openings exposing sections of underlying base layer), to diffuse the prominence of the original defects with the introduced irregularities.

Abstract: A lighting device for a vehicle includes a light conducting rod, at least one light source, at least one first reflecting part, and at least one second reflecting part. The light source is connected to at least one end of the light conducting rod. The first reflecting part and the second reflecting part are located on the light conducting rod and respectively have a reflecting surface toward the light source. A first distance between the first reflecting part and the light source is less than a second distance between the second reflecting part and the light source, and the curvature of the reflecting surface of the second reflecting part is greater than the curvature of the reflecting surface of the first reflecting part.

Abstract: A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. The light extracted from the lightguide has an angular emission profile such that when incident on a prism film, collimated light is produced.

Abstract: A planar light source device capable of increasing light use efficiency and preventing color breakup without using any reflection polarizing plate nor performing multiple reflection. The planar light source device includes a planar light guide plate, light sources arranged as to be opposed to end surfaces of the light guide plate on its both sides, and a divided prism formed in a back surface inside the light guide plate and that reflects light incident upon the light guide plate from the light sources toward a front surface side of the light guide plate. The divided prism includes a prism portion and a dividing portion both of which have a width equal to or less than the wavelength of light from the light sources and is formed with the prism portion and the dividing portion alternately repeated along a direction parallel to the end surfaces of the light guide plate which are opposed to the light sources.

Abstract: A backlight module includes a light guide plate, a first light module, and a second light module. The light guide plate includes first troughs and second troughs on opposite sides. The first light module includes a first substrate and first LEDs thereon. An opaque element is disposed on each first gap between two adjacent first LEDs, each first LED is embedded in one first trough. The second light module includes a second substrate and second LEDs thereon. An opaque element is disposed on each second gap between two adjacent second LEDs, and each second LED is embedded in one second trough. Each first LED is disposed to one second gap, and each second LED is disposed in one first gap. Light from first LED is absorbed by the opaque element on the second substrate, and that from the second LED is absorbed by the opaque element on the first substrate.

Abstract: A display apparatus includes a display panel and a backlight unit for an embodiment. The display panel includes a plurality of pixels and the backlight unit supplies light to the display panel. The backlight unit includes a light source, which generates the light, and an optical sheet. The optical sheet includes a plurality of prism patterns formed on a surface of the optical sheet facing the display panel. The prism patterns include a plurality of peaks and a plurality of valleys to change the path of the light, and a plurality of diffusion patterns arranged at the peaks and valleys.

Abstract: A light guide plate includes an incident surface receiving incident light from a light source, an exit section that outputs exit light having a light distribution different from a light distribution of the incident light and a reflective section opposite to the exit section. A plurality of first patterns are formed on the exit section while being arranged in a first direction of the exit section to distribute the exit light with maximum brightness in a direction perpendicular to the exit section. A plurality of second patterns are formed on the reflective section to scatter the incident light.

Abstract: A light emitting assembly comprises a light source and a light emitting panel member having a panel surface and an input edge for receiving light from the light source. On or in the panel surface is a pattern of individual light extracting deformities. Each of the deformities has a well defined shape and a length and width substantially smaller than the length and width of the panel surface. At least some of the deformities have only two surfaces, each having opposite peripheral edge portions that intersect each other and intersect the panel surface. One of the surfaces of the deformities is substantially perpendicular to the panel surface and is curved in a transverse direction. The other surface of the deformities is a sloping surface.

Abstract: A light guide includes a light interface surface, top and bottom surfaces, a surface feature pattern, and a cut line. The light interface surface receives light into the light guide from a light source. The light received through the light interface surface reflects according to total internal reflection (TIR) within the light guide between portions of the top and bottom surfaces. The surface feature pattern disrupts the TIR and scatters at least some of the light outside of at least one surface of the top and bottom surfaces. The cut line redirects at least some of the light from a first direction to a second direction within the light guide. The first direction is a direction other than towards the surface feature pattern, while the second direction is a direction substantially towards the surface feature pattern. The light guide may back-illuminate an optical keypad with a plurality of push buttons.

Abstract: A display including a light source for generating light, an optical waveguide for receiving and evenly distributing light in a light propagation direction by total internal reflections and a matrix of electromechanical picture elements for modulating light to produce an image.

Abstract: A light guide plate, a backlight module and a liquid crystal display are provided. The light guide plate has a first surface at least having one first structure and one second structure formed thereon. The first structure and the second structure are adjacent arranged and are mirror reflection with each other. Each of the first structure and the second structure has a first protrusion having a cross section of eccentric triangle.

Abstract: A light guide plate has a main-side microprism array sheet (main-side MPA sheet) 3 adhered to the top face 2a thereof, and a sub-side microprism array sheet (sub-side MPA sheet) 4 adhered to the bottom face 2b thereof. A prism formation region of the sub-side MPA sheet 4 is smaller than that of the main-side MPA sheet 3. Prisms in the prism formation region of the main-side MPA sheet 3 are, in an arrangement where the density of prisms arranged increases with distance from a light source 5, so arranged that the density of prisms arranged increases in a region that faces the prism formation region of the sub-side MPA sheet 4.

Abstract: To solve an uneven light quantity caused in a case where a light guide plate, in which light from a spot light source such as an LED enters an surface, changes by 90 degrees and exits the light to the outside, is used as a backlight. The light guide plate of the invention includes a light flux unifying region. The light flux unifying region has an incident surface, a first surface, and an exit surface. Light fluxes emitted from a light source enter the incident surface. The first surface is almost perpendicular to the incident surface and the intensity distribution of the light fluxes having entered is unified at the first surface. The exit surface is disposed almost parallel with the incident surface and the unified light fluxes exit from the exit surface. A boundary line between the incident surface and the first surface has a zigzag surface.

Abstract: An optical film includes a body and a plurality of first linear protrusions. The body has a first surface and a second surface opposite to the first surface. The first linear protrusions are disposed on the first surface, and each first linear protrusion is extended along a first direction and has a first curvy ridge line departing from the first surface, wherein the first curvy ridge lines are concave towards a fixed direction. When the first curvy ridge line is located on a suppositional plan, the suppositional plan is not parallel to the first surface. A ratio of a maximum distance between each of the first curvy ridge line and the first surface over a minimum distance between the corresponding first curvy ridge line and the first surface is greater than 1 but less than 8.

Abstract: The invention provides an illumination device (1) comprising a lighting unit (2). The lighting unit (2) comprises a light source (100) and a substantially flat light guide (200), arranged to collimate light source light (111). The light guide (200) has an entrance window (210), an edge window (220), a first light guide surface (201), a second light guide surface (202), a first side edge (230) and a second side edge (240). One or more of the first light guide surface (201) and the second light guide surface (202) comprise a plurality of grooves (300). In this way, latitudinal collimation is obtained.

Abstract: A polarized light emitting light guide plate includes: a transparent substrate of optically isotropic material, in which the light incident through a lateral side thereof travels; an anisotropic liquid crystal polymer layer formed on an upper surface of the substrate and having first and second refractive indices with respect to first and second perpendicular polarization components; and a polarization separation microstructure formed at an interface between the transparent substrate and the liquid crystal polymer layer, which refracts or reflects the first polarization component and transmits the second polarization component. The refractive index of the polarization separation microstructure is substantially equal to the refractive index of the substrate; the first refractive index of the liquid crystal polymer layer is greater than the refractive index of the substrate, and the second refractive index of the liquid crystal polymer layer light is substantially equal to the refractive index of the substrate.

Abstract: A back-light unit including a plurality of substrates, a plurality of light sources respectively disposed on the plurality of substrates and configured to emit light, and N (N?2) light guide plates respectively disposed adjacent to the plurality of light sources, each light guide plate including a light incidence part having a light incidence surface for receiving light emitted in a first direction from a corresponding light source, and a light emission part for emitting the received incident light in a second direction different than the first direction. Further, at least one of the light guide plates includes light-extracting surface patterns disposed on the light emission part, and the light-extracting surface patterns comprise a first region of light-extracting surface patterns having a higher pattern-density than a second region of light-extracting surface patterns next to the first region.

Abstract: This invention relates to film layer which is suitable for use in a light guide plate and methods of forming said film layer and light guide plate. The invention also relates to the light guide plate and light guide devices made therefrom. The film and light guide plate are suitable for use in a range of applications, particularly in connection with the backlighting of displays, for example, liquid crystal displays.

Abstract: Light guides and backlight systems are disclosed that include one or more groups of geometric light redirectors whose density and/or orientation across the surface of a light guide varies to improve light emission uniformity and to reduce visual artifacts.

Abstract: According to one embodiment, a display element includes a light guide and a light extraction unit. The light guide extends in one direction, and is optically transmissive. The light extraction unit includes a displacement layer, a reflective layer provided on the displacement layer, and a light extraction layer provided on the reflective layer to oppose the light guide. A plurality of prisms are formed in one major surface of the light extraction layer opposing the reflective layer. A trough line is formed between mutually-adjacent ridgelines. The element has at least one selected from a configuration in which an angle between one of the oblique surfaces and one other major surface of the light extraction layer opposing the light guide is different between corresponding oblique surfaces of two mutually-adjacent prisms and a configuration in which the ridgelines of the prisms are non-parallel to the trough line between the ridgelines.

Abstract: A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A lightguide receives the light from an edge surface and guides the light by total internal reflection. The lightguide also has features that exist on one or more lightguide surfaces in the shape of a triangular wedge that reduces the range of angles in the vertical direction within the lightguide. This arrangement enables improved angular performance from out-coupled light.

Abstract: A light guide ring unit includes a first annular surface, a second annular surface opposite to the first annular surface and an inner side surface connecting the first annular surface and the second annular surface. The first annular surface defines a plurality of first elongated grooves extending along a radius of the first annular surface. The second annular surface defines a second groove extending along a radius of the second annular surface. The first annular surface receives light from a light source, and the light is reflected by the inner walls of the second groove.

Abstract: An edge-lit backlight unit for a display is provided. In one embodiment, the backlight unit may include a light guide configured to receive light from a source and emit such light in a broad distribution to a turning film disposed over the light guide. The turning film may be configured to redirect light received from the light guide toward a normal of the turning film. In one embodiment, the light guide may be configured such that peak light distribution therefrom occurs at an incident angle of approximately sixty degrees, with broad light distribution substantially occurring over an angular range between incident angles of thirty-five and eighty-five degrees. Additionally, in one embodiment, the turning film may include multiple prisms that receive and redirect the light emitted from the light guide, and that include apex angles of less than or about sixty degrees. Additional edge-lit backlight units and methods are also disclosed.

Abstract: A display including a display panel and a backlight module adjacent to the display panel is provided. The backlight module includes a light source emitting a light beam and at least one light diffraction member. The light diffraction member includes a first surface, a second surface, an azimuth convergence structure and a light diffraction structure. The second surface is opposite the first surface, and the light beam enters the light diffraction member through the second surface and leaves the light diffraction member from the first surface. The azimuth convergence structure is disposed on the second surface for converging the azimuth of the light beam incident thereon. The light diffraction structure is disposed on the first surface for adjusting the emergence angle of the light beam.

Abstract: A brightness enhancement film (BEF) includes a light transmissive substrate having a first surface and a second surface, a plurality of lenses disposed on the first surface, and a reflective layer. Each of the lenses has a curved protruding surface facing away from the light transmissive substrate. The radius of curvature of the curved protruding surface in a first direction parallel to the first surface is R1, the radius in a second direction is R2, and R1?R2. The reflective layer is disposed on the second surface and has a plurality of light pass openings respectively located on the optical axes of the lenses. The distance between the apex of the curved protruding surface and the corresponding light pass opening is L, the refractive index of the lenses is n, and the BEF satisfies L<nR1/(n?1) and L<nR2/(n?1). A backing light module using the BEF is provided.

Abstract: A backlight module includes a light guide plate, micro-structures, at least one light source, and a first prism sheet. The light guide plate includes a first surface, a second surface, and a light incident surface connecting the first surface and the second surface. The micro-structures are disposed on at least one of the first surface and the second surface. The light source is disposed beside the light incident surface and capable of emitting a light beam. The first prism sheet includes a first transparent substrate and first prism structures. The first surface is located between the second surface and the first transparent substrate. The first transparent substrate is disposed among the first surface and the first prism structures. Each first prism structure has a first vertex angle protruding away from the first transparent substrate, and the first vertex angle falls within a range of 67 degrees to 83 degrees.

Abstract: A backlight unit (110) according to the present invention includes: a light source (102) for emitting light; a light guiding member (103) for receiving light emitted from the light source (102) at an end face (103c), and propagating the received light in a first direction (P); a prism sheet (104) disposed at the front face (103a) of the light guiding member (103); and a reflection section (105) disposed at the rear face (103b) side of the light guiding member (103), and the reflection section (105) has a reflection surface (105a) for light being emitted from the rear face (103b) of the light guiding member (103) and having a component in the first direction, the light being reflected toward the rear face (103b) of the light guiding member (103) as light having a component in a second direction which is the opposite direction to the first direction.

Abstract: An optical prism sheet includes an optical refracting part including a plurality of unit prisms, the unit prisms each having a predetermined cross-section and being disposed on one side of the optical prism sheet, and fine irregularities having a predetermined roughness and configured to diffuse light, the fine irregularities being on surfaces of the unit prisms and increasing a unit surface area of the optical refracting part by about 1.1 to about 100 times.

Abstract: A light guiding structure of a light guide plate is provided. The light guiding structure comprises a plurality of protrusion ridge portions extending along a longitudinal direction. The height or the vertex angle of each protrusion ridge portion periodically or randomly varies along the longitudinal direction.

Abstract: A display including a light source for generating light, an optical waveguide for receiving and evenly distributing light in a light propagation direction by total internal reflections and a matrix of electromechanical picture elements for modulating light to produce an image.

Abstract: A light guide plate for guiding light includes a light-incident portion allowing light generated from a light source to be incident thereon, a light-facing portion opposite to the light-incident portion, and a first prism pattern disposed between the light-incident portion and the light facing portion and substantially normal to a path of light incident from the light-incident portion to the light-facing portion path.

Abstract: A light guide plate including a body and a plurality of prism microstructures is provided. The body has a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces. The light emitting surface has a central area and at least one peripheral area outside the central area. The prism microstructures are disposed on the light emitting surface and the bottom surface. The prism microstructure disposed on the light emitting surface includes a plurality of first prism microstructures in the central area and a plurality of second prism microstructures in the peripheral area. A top angle ?2 of the second prism microstructure is greater than a top angle ?1 of the first prism microstructure. A backlight module including the above-mentioned light guide plate is also provided.

Abstract: An optical film is applied to a side-emitting backlight module. The side-emitting backlight module has a light guide plate for guiding a chief light beam. The light guide plate has a light emitting surface to define a normal direction thereof. The optical film includes a lower prism structure, an intermedium layer, and an upper prism structure. The lower prism structure is disposed on the light emitting surface. The intermedium layer is connected between the lower prism structure and the upper prism structure. When the chief light beam exits from the light emitting surface of the light guide plate, and then goes through the lower prism structure, it goes through the intermedium layer along a changed traveling direction. When the chief light beam exits from the intermedium layer, and goes through the upper prism structure, it turns from the changed traveling direction to the normal direction.

Abstract: A small-size and light-weight backlight system and a planar display device has a structure such that luminance unevenness and chromaticity unevenness in the vicinity of the incident light portion of a light guide plate are not noticeable. The back light system includes a light guide plate arranged to guide the light from a light source and emit the light in a planar direction. The light source includes a linear light source body arranged in the vicinity of the side edge of the light guide plate. The linear light source body includes a linear body in which a plurality of light emitting elements are embedded in the longitudinal direction. A light direction change sheet is arranged on the light emission surface of the light guide plate. The light direction change sheet has a plurality of protruding stripes arranged substantially parallel to the longitudinal direction of the linear light source body formed on the surface opposing to the light guide plate.

Abstract: A light guiding structure of a light guide plate is provided. The light guiding structure comprises a plurality of protrusion ridge portions extending along a longitudinal direction. The height or the vertex angle of each protrusion ridge portion periodically or randomly varies along the longitudinal direction.

Abstract: An optical waveguide (106) with directional microprisms (116) and multidirectional light sources (110)(112) are provided for providing overlapping morphing images (104) and information (102) on a display (124) of a touch screen mobile phone or other electronic device (100). Microprisms can be patterned in the shape of a particular design, character, icon or other image. The microprisms can include: first microprisms (118) sensitive to light propagating in only one direction; second microprisms (120) sensitive to light propagating in a different direction, and a third microprisms (122) sensitive to light propagation in multiple directions. When light is directed into the waveguide (106) in a direction to which a portion of the microprisms (116) are sensitive, a fraction of that light will be directed upward and out of the waveguide (106) by those microprisms sensitive to light propagated in that direction.

Abstract: A surface light emitter comprising a surface-emitting device is notably increased in the front brightness of light outputted from the surface-emitting device. In the surface light emitter comprising the surface-emitting device 20 and a light control sheet 10, a repetitive concavo-convex pattern of trapezoidal from in section is formed at least on one side of the light control sheet and has planar portions 12a at distal ends of projections of the concavo-convex pattern tightly bonded to an output surface 21a of the surface-emitting device. The light control sheet satisfies a condition 0.75>D>4[(sin ??1/n)2+0.

Abstract: A light guide plate (LGP) including a first surface, a second surface, a light incident surface and a plurality of optical micro-structures is provided. The first surface is opposite to the second surface. The light incident surface connects the first surface and the second surface. The optical micro-structures are disposed on the second surface and include a plurality of round protrusive points and a plurality of curved protrusions. The curved protrusions are disposed among the round protrusive points. Each of the curved protrusions has a first arc side and a second arc side opposite to the first arc side, and an indentation of the first arc side and an indentation of the second arc side are substantially towards a same direction. In addition, a backlight module employing the above-mentioned LGP is also provided.

Abstract: A surface illuminating device is provided and includes a plurality of linear light sources, a light-transmissive optical sheet including a luminance-distribution control layer for decreasing unevenness in luminance of light emitted from the linear light sources, and a reflection surface for reflecting the light emitted from the linear light sources. The luminance-distribution control layer includes a plurality of protrusions. In a range of 0?x?L/2, protruding directions of some or all the protrusions are inclined such that the protruding directions of the protrusions are located farther from a Z direction, which is an optical axis of a linear light source in an X direction, to the X direction as the protrusions are located farther from the position of x=0 in the X direction, where the X direction represents the arrangement direction of the linear light sources.

Abstract: In a display device equipped with a light source device, a second light-guide member is provided to the back surface of a first light-guide member that has an emitted light control sheet provided to the front surface thereof. The emitted light control sheet is composed of a flat plate portion and protrusions. A first light source mounted to a side surface of the first light-guide member, and a second light source mounted to a side surface of a second light-guide member are switched and turned on. The emitted light control sheet has light-condensing effects when the first light source is on, and has diffusing effects when the second light source is turned on. The angle range of illuminating light can thereby be switched.