Abstract: This document describes techniques and apparatuses for implementing a hybrid concentrator for a backlight. The backlight includes a light guide and multiple light sources positioned along an input end of the light guide. The backlight further includes multiple hybrid concentrators that each include a lens in a central region of the concentrator and one or more total-internal-reflection (TIR) zones. Each hybrid concentrator is positioned between a corresponding light source and the light guide, and is configured to concentrate light into the light guide. The light guide then projects the concentrated light to illuminate a modulating display panel to form images for viewing.

Abstract: The present invention provides a backlight module and a display apparatus. The display apparatus comprises the backlight module and a display panel. The backlight module comprises a back bezel and a plurality of light sources. The back bezel includes a plurality of bezel convex portions and a plurality of corresponding bezel concave portions. The light sources are disposed on the back bezel and positioned between the bezel convex portions. The present invention can use the bezel concave portions of the back bezel to improve a heat-dissipation effect.

Abstract: A backlight to emit light from a surface thereof includes a light guide to guide light, first and second collimating reflectors and a light source to produce light. The first collimating reflector is at a first edge of the light guide to collimate the light from the light source in a vertical direction and to direct the collimated light into the light guide. The second collimating reflector is at a second edge of the light guide to further collimate the collimated light in a horizontal direction and to redirect the further collimated light back into the light guide.

Abstract: Provided are a surface light emitting device and a liquid crystal display apparatus equipped with the surface light emitting device. The surface light emitting device includes: a light guide plate including a side surface where light enters, a principal surface where the light goes out and a rear surface opposite to the principal surface; and a reflection sheet arranged on the rear surface of the light guide plate; a substrate arranged with facing the side surface of the light guide plate. The surface light emitting device further includes: plural light emitting bodies arranged along a longitudinal direction of the substrate and mounted on a surface of the substrate; a frame and a rear frame holding the substrate, the light guide plate and the reflection sheet; and one or more reflecting bodies arranged around a part of the light emitting bodies and extending along a longitudinal side of the substrate.

Abstract: Even though no light source is provided in the vicinity of each curved apex of a main face, the brightness difference depending on the location on the main face is reduced, and a light guide plate that contributes to electric power saving can be provided. A display and a traffic sign including the display that can keep a small brightness difference depending on the location on the main face, and reduce the power consumption. The ratio of the area of the first diffusion dots and second diffusion dots within the second diffusion region is greater than the ratio of the area of the first diffusion dots within the first diffusion region. Even though no light source unit is provided at a curved section, the brightness difference (the unevenness of brightness) depending on the location on the entire main face is reduced, and electric power saving can be achieved.

Abstract: A lamp includes a frame, a light guide plate, a light source and a reflecting structure. The light guide plate is disposed on the frame and includes a light-incident surface, a first light-emitting surface and a second light-emitting surface. The second light-emitting surface is opposite to the first light-emitting surface, in which the light-incident surface connects the first light-emitting surface and the second light-emitting surface. The light source is adjacent to the light-incident surface and the light source is disposed in the frame. The reflecting structure is adjacent to the first light-emitting surface and includes at least two transparent sheets. The two transparent sheets are separated by an air gap, such that at least one light beam emitted from the first light-emitting surface is reflected back to the light guide plate and is emitted out from the second light-emitting surface.

Abstract: An apparatus and method for coupling light from concentric illuminators into a light source in the form of a surface are disclosed. According to one embodiment, the apparatus comprises a plurality of concentric tubes, each tube including a light diffuser. The apparatus also has a sheet having a first edge with the plurality of concentric tubes placed along the first edge. Each tube of the plurality of concentric tubes diffuses light such that the light emanates in a predetermined pattern along the first edge of the sheet.

Abstract: To provide a planar light source device that can provide large-area, uniform, and high-quality planar illumination light. A planar light source device includes a main body case 4 that surrounds the periphery of a gap between a pair of optical reflection plates disposed to face each other with side plates, and a plurality of point light sources 2 arranged at predetermined intervals on at least one side plate of the main body case. The planar light source device allows light from the point light sources 2 to be transmitted through at least one of the pair of optical reflection plates 5 and emitted to the outside.

Abstract: A laser backlight plate includes a laser source, a light guide plate, least one reflective layer, and at least one light divergent structure. The laser source is configured for providing a laser beam. The light guide plate has a light emission surface, a backlight surface, and at least one side surface. The backlight surface is disposed opposite to the light emission surface, and the side surface extends between the light emission surface and the back light surface. The reflective layer at least partially covers the backlight surface and the side surface, and is configured for reflecting the laser beam impinging on the reflective layer to the light emission surface. The light divergent structure is configured for diffusing the laser beam, which is incident on the light guide plate from the light divergent structure, and is reflected to the light emission surface by the reflective layer.

Abstract: A display device is disclosed. In one aspect, the display device includes a protective member, a display panel accommodated in the protective member, a light guide member including a light incident surface, a heat discharge member including a support surface facing the light incident surface, and a light source disposed on the support surface to supply light to the light incident surface. The light source includes a light-emitting device disposed on one surface of a circuit board, the circuit board including a first area substantially overlapping the light-emitting device and a second area adjacent to the first area, a first adhesive member disposed between the other surface of the circuit board and the support surface and substantially overlapping the first area, and a second adhesive member disposed to substantially overlap the second area. The first adhesive member has a higher heat conductivity than the second adhesive member.

Abstract: A luminaire for use in lighting a large open space such as a parking lot or deck of a parking garage includes a plurality of optical waveguides disposed in side-by-side relationship and together defining a closed path and at least one LED associated with each optical waveguide and disposed at a first end of the associated optical waveguide.

Abstract: Disclosed is a light emitting device module, which includes a circuit board having at least two cavities, a reflective layer formed on a surface of each cavity, and a light emitting device package disposed in each cavity. The light emitting device package includes a package body and a light emitting device disposed on the package body, the light emitting device being electrically connected to a first lead frame and a second lead frame.

Abstract: A light guide plate includes an optically effective portion and an optical coupling portion adjoining the optically effective portion. The optically effective portion includes a first bottom surface, a light output surface opposite to the first bottom surface, and a side surface connected between the first bottom surface and the light output surface. The optical coupling portion includes a second bottom surface, a first light incident surface opposite to the side surface, a second light incident surface, a first connecting surface, and a second connecting surface. The second bottom surface is coplanar with the first bottom surface. The second light incident surface extends from the first light incident surface away from the side surface. The first connecting surface extends from the second light incident surface toward the side surface. The second connecting surface is connected between the first connecting surface and the light output surface.

Abstract: An edge-lit waveguide-based backlighting apparatus for high-brightness microdisplays. In one example, the backlighting apparatus includes a waveguide having substantially parallel top and bottom surfaces and a side surface substantially perpendicular to the top and bottom surfaces and extending between the top and bottom surfaces along a periphery of the waveguide, a specularly reflective film disposed on and at least partially covering the bottom and side surfaces of the waveguide, and at least one light source disposed on the side surface and configured to emit light into the waveguide in a direction of a length of the waveguide, the waveguide being configured to direct the light out of an output region of the top surface of the waveguide.

Abstract: A light source device includes: a rod-shaped light source or an array light source extending in a main scanning direction; a reflector that is placed opposite the rod-shaped light source or the array light source, extends in the main scanning direction, and reflects light output from a side face of the rod-shaped light source or the array light source; and a plurality of reflector supports that are arranged at an interval along the main scanning direction and support the reflector.

Abstract: A backlight module including a light guiding plate, a light source and a block is provided. The light guiding plate includes a first surface, a second surface opposite to the first surface, a light incident surface connecting to the first surface and the second surface, and a side surface opposite to the light incident surface. A thickness of at least part of the light guiding plate decreases progressively from the side surface towards the light incident surface. The light source is disposed beside the light incident surface and is capable of emitting a light beam into the light guiding plate through the light incident surface. The block is disposed beside the side surface and includes a reflecting surface facing towards the side surface. The reflecting surface is a concave surface on the block, and the reflecting surface is capable of reflecting the light beam returning to the side surface.

Abstract: A light guide device is provided. The light guide device includes a light guide plate and a light source. The light guide plate includes an incident plane, a bottom plane and a top plane. The bottom plane includes a reflective plane and an inclined bottom plane, wherein the inclined bottom plane connects the bottom of the incident plane and the reflective plane, and the inclined bottom plane is inclined relative to the reflective plane. The top plane includes an inclined top plane, a light-emitting plane and a connecting plane, wherein the inclined top plane connects the top of the incident plane and the connecting plane, the connecting plane connects the inclined top plane and the light-emitting plane, and the inclined top plane is inclined relative to the connecting surface. Furthermore, the light source is located next to the incident plane.

Abstract: A light intensity distribution conversion element has a light incident surface, a light emission surface, and total reflection surfaces. Light having directivity enters the light incident surface. The light emission surface has a curved surface portion of a concave shape with respect to an emitting direction of the light, for broadening an angular intensity distribution of the light. The total reflection surfaces are near or are adjacent to the curved surface portion, are slanted against the emitting direction of the light, and totally reflect the light. The light reflected by the total reflection surfaces is emitted from the curved surface portion.

Abstract: Disclosed is an LED lighting device which is easily assembled and disassembled and has a stable assemblability without structural shaking. The LED lighting device is able to improve a heat radiating characteristic and optical efficiency. The LED lighting device comprises a light guide plate comprising a top surface; an upper case comprising a base disposed on the top surface of the light guide plate, and an edge extending from the base, wherein the base is thicker than the edge; a lower case comprising a body coupled to the edge of the upper case; a reflective sheet disposed between the top surface of the light guide plate and the base of the upper case; and a light source unit disposed between the light guide plate and the body of the lower case.

Abstract: This backlight device (illumination device) (12) is provided with: a plurality of LEDs (light sources) (17) arranged in a row at intervals; a light-guide plate (16) having a light-receiving surface (16b) that is arranged opposing the LEDs (17) and that receives light from the LEDs (17) and a light-emitting surface (16a) from which the light that entered is emitted; a reflective sheet (reflective member) (20) arranged so as to cover the surface of the light-guide plate (16) opposite to the light-emitting surface (16a) and that reflects light toward the light-emitting surface (16a); and an extended reflective part (26) provided in an edge portion of the reflective sheet (20), the extended reflective part (26) extending toward the LEDs (17) from the light-receiving surface (16b), the extended reflective part (26) having openings (27) formed therein that correspond to the arrangement pattern of the LEDs (17), thereby being arranged corresponding to the non-arrangement pattern where the LEDs (17) are not provided.

Abstract: A replacement lamp for a cinema poster display case. Light from a linear array of white-light LEDs reflects off a concave reflector to an illumination plane at or near a front face of the display case. The concave reflector intersects with surface normals from the LED emission faces along an intersection line. The concave reflector has proximal and distal portion on opposite sides of the intersection line. The illumination plane is disposed on an opposite side of the LEDs from the intersection line. The illumination plane has a proximal portion near the LEDs and a distal portion away from the LEDs. Light reflected from the LEDs off the proximal portion of the concave reflector is directed to the distal portion of the illumination plane. Light reflected from the LEDs off the distal portion of the concave reflector is directed to the proximal portion of the illumination plane.

Abstract: A backlight unit is provided. The backlight unit may include a light emitting device package, a light guide plate including a first region and a second region extending from the first region, with upper surfaces of the first and second regions being spaced apart so as to form a stepped surface. A recess may be formed in a lateral surface of the second region to receive the light emitting device package, and an optical sheet may be received on the upper surface of the second region of the light guide plate.

Abstract: A light source device includes a circuit board having a LED mounted on a surface, a lens attached to the surface so as to diffuse light emitted from the LED, a reflecting sheet having a through hole in the inside of which the lens is disposed and reflecting light emitted from the LED at an opposite side of the surface, and a restricting member which is disposed at one of an edge of the through hole in the reflecting sheet and the lens, and restricts a deviation of the reflecting sheet in a direction departing from the surface.

Abstract: A light emitting diode (LED) lamp includes a heat dissipation module, a circular light guide plate (LGP), and LED light sources. The heat dissipation module includes a heat dissipation element and a heat-conducting base that has a containing concave. The heat dissipation element connecting and surrounding the heat-conducting base is distant from the circumference of the heat-conducting base. The circular LGP in the containing concave has a top surface, a bottom surface, and an annular side surface. The top surface faces the heat-conducting base and has concentric annular trenches. The LED light sources are configured in the containing concave and face the annular side surface. The LED light sources are suitable for emitting a light beam which is capable of passing through the annular side surface to enter the circular LGP and capable of being reflected by the annular trenches and emitted from the bottom surface.

Abstract: Disclosed is a light emitting device module. The light emitting device module includes a first lead frame and a second lead frame electrically separated from each other, a light emitting device electrically connected to the first lead frame and the second lead frame, the light emitting device includes a light emitting structure having a first conduction type semiconductor layer, an active layer, and a second conduction type semiconductor layer, a dam disposed at the peripheral area of the light emitting device, a resin layer surrounding the light emitting device and disposed at the inner area of the dam, and a reflective member disposed at the peripheral area of the dam and including an inclined plane formed on at least one side surface thereof.

Abstract: A light source module with a wide angle of illumination into a light guide plate includes a light source unit and a light guide plate. The light source unit includes a laser light source, a light converging member, and a reflective member. The laser light source emits a synthesized white laser beams. The light converging member converges the synthesized white laser beams onto the reflective member. The reflective member faces a light incident surface of the the light guide plate and spreads the reflected light out in a wider angle towards the light incident surface. Light is emitted from all parts of the light guide plate out through the light output surface.

Abstract: An HVAC Controller including a printed circuit board (PCB) and a display sub-assembly. The display sub-assembly may include a frame, a display, and a light guide. The frame may be secured relative to the PCB and may have a front side facing away from the PCB and a back side facing toward the PCB. The frame may include one or more side walls that may extend between the front side and the back side, where the side walls may define a space. The display and the light guide may be positioned at least partially within the space and the light guide may be positioned between the display and the PCB. The frame may have one or more back stop features and one or more front stop features that stop the light guide and the display from sliding out of the back side and front side of the frame, respectively.

Abstract: A backlight module includes a light guide plate and a light source module. The light guide plate includes a light incident surface. The light incident surface forms a sector-cylinder-shaped cutout on the light guide plate. The light source module includes tricolor lasers, two spectroscopes and a MEMS mirror. The tricolor lasers are arranged opposite to the light guide plate. The two spectroscopes are respectively arranged opposite to two of the tricolor lasers. The two spectroscopes respectively reflect light emitted from two of the tricolor lasers, and transmit the light emitted from the others. Thus, white light is achieved after the light emitted from the tricolor lasers passes through the two spectroscopes. The MEMS mirror is arranged opposite to the light incident surface for reflecting the white light and rotating to form a scanning light beam, which finally enters into the light guide plate through the light incident surface.

Abstract: A backlight device wherein LEDs which are arranged side by side at a first arrangement interval (P1) are provided to each LED unit. The LED units are mounted to a flexible board at a second arrangement interval. A light guide plate is disposed in such a manner that an end surface thereof is spaced from the LEDs by a distance (H). The light guide plate is disposed so as to satisfy the following relationship: first arrangement interval (P1)<distance (H)<second arrangement interval (P2). Specifically, the LEDs are arranged side by side in such a manner that the first arrangement interval (P1) is not less than 0.1 mm but not greater than 3 mm and the second arrangement interval (P2) is not less than 5 mm but not greater than 15 mm. The light guide plate is disposed in such a manner that the distance (H) is not less than 1 mm but not greater than 7 mm.

Abstract: An optical element includes a light guide plate, a reflector received in a mounting hole of the light guide plate, and a supporting rod secured to and extending upwardly from the reflector. The light guide plate defines the mounting hole extending through the light guide plate from a top face to a bottom face thereof. The reflector includes a mounting surface coplanar with the top face of the light guide plate and a tapered reflecting face extending slantwise downwardly and inwardly from the mounting surface thereof. A backlight module incorporating the optical element is also provided. The backlight module has an LED located in the mounting hole and faces the reflecting face, and a diffuser plate secured to a top end of the supporting rod.

Abstract: A mixing light module includes a matrix, a fluorescent film, and a plurality of micro-structures. The matrix includes an incidence surface, an emission surface and a reflective surface. The fluorescent film disposed on or above the emission surface has an upper surface and a lower surface and includes a plurality of fluorescent particles. The matrix receives a first light having a first wavelength, and the reflective surface reflects the first light to make the first light to be emitted from the emission surface. Since the plurality of fluorescent particles receives a part of the first light from the emission surface, the plurality of fluorescent particles is excited to emit a second light having a second wavelength. The second light and the first light are mixed into a predetermined light. The plurality of micro-structures is used to make the first light or the second light uniform.

Abstract: A display device and a lighting device are provided. The display device includes a display element for outputting an image according to a provided image signal, a frame disposed on a rear surface of the display element, and a reflection layer formed on the frame and positioned between the display device and the frame, the reflection layer being a coating layer formed using a paint including at least one of silver and aluminum. When the backlighting device of the display device is configured, a reflection plate where deposition films and a reflection layer made of a metal component are deposited is not required and the reflection layer is formed on the frame by using a paint having at least one of silver and aluminum as its main components, thereby simplifying a manufacturing process, and contributing to reducing the thickness of the display device.

Abstract: In a surface light source device frame, an amount of light that leaks from an outer peripheral surface of the frame can be decreased while a decrease in luminance is suppressed in an emission surface. The frame includes a rectangular frame main body made of a black resin and an auxiliary member made of a white resin. In inner peripheral surfaces of both lateral sides of the frame main body, fitting portions are provided in an end portion on a side farther away from the light source in the frame main body in order to fit the leg portions. The auxiliary member is attached to the inner peripheral surface on the side farther away from the light source in the frame main body while the leg portions are fitted in the fitting portions.

Abstract: A display apparatus includes a liquid crystal panel and a backlight unit that emits light toward a back surface of the liquid crystal panel. The backlight unit includes an LED, a light guide plate which light from the LED enters through a side surface and exits through a main surface toward the back surface of the liquid crystal panel, and a reflective sheet that reflects the light. The reflective sheet includes a first reflective portion facing the side surface of the light guide plate and including a through-hole through which the LED passes, a second reflective portion connected to a first end of the first reflective portion and covering a surface of the light guide plate opposite to the main surface, and a third reflective portion connected to a second end of the first reflective portion and covering a portion of the main surface of the light guide plate.

Abstract: Light that leaks from an outer peripheral surface of a lightguide plate can be reflected and returned to the lightguide plate by a frame, and light that is transmitted through the frame to leak out can be reduced. A reflecting sheet is disposed in a lower surface of the frame, and the lightguide plate and the light source are accommodated in the frame. The frame is formed such that an outer peripheral surface of a rectangular-frame-shaped inside frame portion made of a white resin is covered with a rectangular-frame-shaped outside frame portion made of a black resin. The inside frame portion and the outside frame portion are integrally molded by a two-color molding method.

Abstract: A lighting device includes a translucent member having the same cross sectional tubular shape throughout a longitudinal direction and including a lens that includes a light incident surface for receiving incident light and a pair of light exit surface for diffusing and emitting the light incident on the light incident surface to the outside, and a light-emitting portion mounted on a substrate and emitting the light toward a region including the light incident surface of the translucent member, where in the translucent member includes a pair of light guide portions for guiding the light incident on the light incident surface to a pair of the light exit surfaces so that the light incident on the light incident surface is diffused and emitted from the pair of light exit surfaces in a width direction that is orthogonal to the longitudinal direction.

Abstract: The present invention provides an LED light-source structure and a backlight module comprising an LED light-source, wherein the LED light-source structure further comprises a light reflecting device, and the light reflecting device is disposed corresponding to a light output surface of the LED light-source, and the light reflecting device has at least one light output opening, and the periphery of the light output opening is a plate-shaped frame for reflecting the light of the LED light-source, and a vertical size of the light output opening is less than a height of the light output surface of the LED light-source. With use of the present invention, all or most of the light emitted from the light output surface of the LED light-source can be inputted into a side input surface of a light guide plate (LGP), thus reducing a light scattering loss and improving a light input efficiency of the LED.

Abstract: A reflective plate includes a high heat conductivity material having a first heat conductivity and a reflective material having a second heat conductivity on the high heat conductivity material, wherein the first heat conductivity of the high heat conductivity material is greater than the second heat conductivity of the reflective material.

Abstract: A display device includes a light source part to output a light, a light incidence part into which the light outputted from the light source part is inputted, a groove part formed in a first surface of the light incidence part based on a display pattern to be displayed via the light incidence part, a background part formed on the first surface of the light incidence part except the groove part and configured to form a background of the display pattern, and a reflection part formed on the groove part to reflect a part of the light that enters the light incidence part so as to form the display pattern on the background formed by a part of the light reflected by the background part. The inputted light is outputted outside through a second surface opposite to the first surface of the light incidence part.

Abstract: A backlight module comprises a light guide plate, a plurality of light guide portions, and a plurality of light sources. Each light guide portion is wedge-shaped. Each light guide portion comprises a first side surface and a second side surface opposite to the first side surface. The second side surface is in contact with the light guide plate. Along a direction perpendicular to the light guide plate, a thickness of the first side surface is greater than a thickness of the second side surface. A receiving groove is defined on the first side surface. Each light source is received in a corresponding one of the receiving grooves.

Abstract: A backlight unit includes a light source which generates a first light; a quantum dots member which is spaced apart from the light source by a first distance and converts the first light into a second light; a guide member which lengthwise extends in a first direction and fixes positions of the light source and the quantum dots member; and an optical member which reflects the second light. The guide member guides the first light from the light source to the quantum dots member and guides the second light from the quantum dots member to the optical member.

Abstract: A backlight to emit light from a surface thereof includes a light guide to guide light, first and second collimating reflectors and a light source to produce light. The first collimating reflector is at a first edge of the light guide to collimate the light from the light source in a vertical direction and to direct the collimated light into the light guide. The second collimating reflector is at a second edge of the light guide to further collimate the collimated light in a horizontal direction and to redirect the further collimated light back into the light guide.

Abstract: The present invention introduces a new class of thin doubly collimating light distributing engines for use in a variety of general lighting applications. Output illumination from these slim-profile illumination systems whether square, rectangular or circular in physical aperture shape is directional, square, rectangular or circular in beam cross-section, and spatially uniform and sharply cutoff outside the system's adjustable far-field angular cone. Some embodiments provided include thin light distributing engines which provide input light collimated in one meridian and a light distributing element that maintains input collimation while collimating output light in the un-collimated orthogonal meridian, in such a manner that the system's far-field output light is collimated in both its orthogonal output meridians.

Abstract: A backlight module has a light guide plate, a back plate and light emitting assemblies. The light guide plate is substantially prism-like. The back plate has a shape corresponding to that of the light guide plate, and has an inclined first side plate and an inclined second side plate opposite to the first side plate. Each of the first and second side plates has at least one receiving recess, and the light emitting assemblies are received in the receiving recesses. In comparison with a side-light type backlight module, the present invention saves a heat-dissipation aluminum extrusion member. In comparison with a direct-light type backlight module, the present invention shortens the light mixing distance in a vertical direction, so as to reduce the module thickness.

Abstract: A light-source unit for providing light to a display panel includes at least one light-source. The at least one light-source is mounted in a circuit board. A body portion having a housing space houses the circuit board on which the at least one light-source is mounted. A reflection portion reflects light emitted from the at least one light-source. The reflection portion has a parabola shape. The light is reflected by the reflection portion to proceed straight and in a direction perpendicular to a direction that the light is emitted from the at least one light-source.

Abstract: A surface light source device capable of obtaining uniform and high brightness emitted light is disclosed. The surface light source device can include a light source (11) that emits light; a light guiding plate (12) that guides light from the light source that is incident on a rear surface side thereof or a side surface side thereof and emits the light from a front surface side thereof; and a diffusion plate (14) disposed on the front surface side of the light guiding plate that diffuses the incident light from the light guiding plate to a front surface side thereof. The diffusion plate can be made from nonwoven fabric with an areal weight of not less than 0 g/m2 and not more than 40 g/m2.

Abstract: A backlight module includes a light guide board, at least one light emitting unit, a plurality of first glues, and a first reflection sheet. The light guide board has a light entrance surface, a light exit surface, and at least one reflection surface. The reflection surface is connected to the light entrance surface and the light exit surface respectively. The light emitting unit is disposed at the light entrance surface of the light guide board. The plurality of first glues is alternatively disposed on the reflection surface in a from-sparse-to-dense manner. The first reflection sheet is disposed on the plurality of first glues such that the first reflection sheet can be fixed onto the reflection surface.

Abstract: Disclosed is an LED lighting device which is easily assembled and disassembled and has a stable assemblability without structural shaking. The LED lighting device is able to improve a heat radiating characteristic and optical efficiency. The LED lighting device according to the embodiment includes a lower case; a light source unit disposed on one side of the lower case; a light guide plate disposed in parallel with the light source unit; and an upper case disposed on the light guide plate and coupled to the lower case in an attachable and removable way.

Abstract: A back light unit and an image display device are disclosed. The image display device includes a first reflection pattern and a second reflection pattern which are disposed on a plate at a predetermined interval from a light source and which pass light having an acute angle emitted by the light source.

Abstract: An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array (71) and a reflective plate (73) are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member (72) is disposed on the side of the LED array (71). The light-guiding member (72) includes a direct emission unit (77) disposed between an illumination range y centered on a document reading position and the LED array (71) and an indirect emission unit (78) disposed between the reflective plate (73) and the LED array (71), a light incidence face of the direct emission unit (77) and a light incidence face of the indirect emission unit (78) are disposed at mutually different position around the LED array (71), and the LED array (71) is disposed on a side of an interior angle formed by the light incidence faces.