Abstract: Disclosed is a backlight unit and a display device using the same, which includes a first reflector, a second reflector 300 and at least one light source module 100 disposed between the first and second reflectors, wherein a back surface of the first reflector comprises an inclined plane 201 and a flat surface 202, with facing the second reflector, and the inclined plane is adjacent to the light source and the flat surface is extended from an end of the inclined plane, with the inclined plane and the flat surface being collinear.

Abstract: Extended area lighting devices include a light guide and diffractive surface features on a major surface thereof. The diffractive surface features include diffractive features of different pitches in non-overlapping regions of the major surface tailored to extract guided-mode light of different colors from the light guide in different directions. The diffractive features extract light such that an ordinary user observes substantially different colors in different regions of the light guide, providing a colorful appearance. Notwithstanding this, the diffractive features also extract light such that the lighting device illuminates a reference surface, disposed at an intermediate distance from the light guide, with illumination light that is substantially uniform in color and substantially white. Optical films having diffractive features that can be used to construct such devices and light guides are also disclosed.

Abstract: A face-lit waveguide illumination system employing a planar slab or plate of an optically transmissive material. A light source is optically coupled a linear optical element which is attached to a face of the waveguide and is configured to inject light at an angle permitting for light propagation by means of a total internal reflection. Light is propagated through the waveguide towards a predetermined direction in response to optical transmission and total internal reflection. Light extraction features located along the prevailing path of light propagation extract light from the waveguide and emit such light towards a surface perpendicular. In one embodiment, the planar waveguide includes a window pane which provides light transport from one location, where light is injected through the face of the pane, to another location where light is extracted. Additional embodiments of the face-lit waveguide illumination system are also disclosed.

Abstract: The backlight device (24) of the present invention is provided with: a heat-dissipating member (36) having a bottom surface part (36a); a light guide plate (20) that has a light-receiving face (20a) on the side face thereof and that is arranged such that the back surface of the plate faces the front of the bottom surface part (36a); and LED light-source (28) that is arranged opposite to the light-receiving face (20a) above the front surface of the bottom surface part (36a); a reflective sheet (26) that is arranged to be in contact with the back surface of the light-guide plate (20); and a protruding part (38) that is formed so as to protrude from the front surface of the bottom surface part (36a) between the LED light source (28) and the light-receiving face (20a), the protruding part (38) being higher than the back surface of the light guide plate (20).

Abstract: An embodiment discloses a light emitting device package including a first lead frame and a second lead frame disposed spaced from each other, a light emitting device disposed on the first lead frame, and a reflective sidewall disposed on the first lead frame and the second lead frame to surround the light emitting device, wherein a portion of the reflective sidewall has a height higher than the other portion of the reflective sidewall.

Abstract: A lighting device and a cove lighting module are provided. The lighting device includes a shell body, at least one light emitting diode element, and at least one light guide plate. The light emitting diode element and the light guide plate are disposed in the shell body. The light guide plate is disposed adjacent to the light emitting diode element to enable light emitted by the light emitting diode element to enter the light guide plate through a light incident surface of the light guide plate and to exit from the light guide plate through a light emitting surface of the light guide plate. The cove lighting module includes a light-receiving object and the lighting device, wherein the light-receiving object has an opaque surface. In the cove lighting module, the light exiting from the light guide plate is directly emitted to the opaque surface of the light-receiving object.

Abstract: A display device includes a display portion displaying an image on the front side, a light guide plate arranged on the rear side of the display portion, a heat radiation member arranged on the rear side of the light guide plate, radiating the heat of the light source, and a reflective sheet arranged between the light guide plate and the heat radiation member, including a heat reflecting portion capable of reflecting the heat radiated from the heat radiation member to the heat radiation member on the rear side, while the heat radiation member includes a heat releasing portion configured to release the heat reflected by the heat reflecting portion to the rear side of the heat radiation member.

Abstract: An optical waveguide assembly includes a plurality of separate body sections each having a coupling cavity for receiving an LED element and a light extraction feature spaced from the coupling cavity, and a mounting structure surrounding the plurality of body sections that maintains the plurality of body sections in assembled relationship. The waveguide assembly may be incorporated into a light engine.

Abstract: A backlight device (24) of the present invention includes: a chassis (22) having at least a bottom plate (22a) that is rectangular in a plan view; a light guide plate (20) that has light-receiving faces (20a), which are side faces, and a rear surface that faces the surface side of the bottom plate (22a); LED light sources (28) that are arranged on the surface side of the bottom plate (22a) and that face the respective light-receiving faces (20a); protruding parts that have a protruding shape and spacer parts positioned on the surface side of the bottom plate (22a), facing the light guide plate (20) side; and a reflective sheet (26) that is arranged between the light guide plate (20) and bottom plate (22a).

Abstract: A display device includes: a backlight assembly which generates and outputs light; and a display panel which displays an image with the light from the backlight assembly. The backlight assembly includes: a light emitting unit which generates the light; a light guide plate which guides the light provided from the light emitting unit toward the display panel and includes a protruding part which protrudes laterally from the light guide plate from the light guide plate at a first corner thereof; and a reflective member which is on a surface of the protruding part and reflects the light provided from the light emitting unit toward the protruding part and toward a second corner of the light guide plate and the periphery of the second corner.

Abstract: A narrow border backlight module includes a frame, a reflective isolation layer, and a light guide element. The frame includes a plural of sidewalls connected to each other, and the bottom of the frame is hollow. The sidewalls define a cavity. The reflective isolation layer is disposed on an inner surface facing the cavity of the sidewalls. The light guide element is formed inside the frame, and the light guide element and the frame are integrally formed.

Abstract: An interactive image system includes an image display device and a control device. The image display device includes a housing, a display unit, a light emitting component and at least one light guide element. The housing has a surface having a light output portion. The display unit is disposed in the housing and has a display surface exposed from the surface of the housing. The display surface faces the same direction as the surface. The light emitting component is disposed in the housing for emitting a light signal. The light guide element is disposed in the housing and located in a transmission path of the light signal. The light guide element is used for receiving the light signal and transmitting light signal to the light output portion. The control device has a light sensing element which faces to the image display device and configured to capture an image.

Abstract: A planar light apparatus is disclosed and includes a reflection part, a secondary optic device, and a light-emitting device. The secondary optic device has a light incident surface, a light emitting surface, and a side surface, which is an elliptic surface, between the light incident surface and the light emitting surface. A reflecting surface of the reflection part and the light emitting surface face a void space formed between the secondary optic device and the reflection part. Light beams emitted by the light-emitting device into the secondary optic device through the light incident surface can be reflected by the side surface to emit out of the secondary optic device through the light emitting surface into the void space to be reflected by the reflecting surface. Thereby, the planar light apparatus without a conventional light-guiding plate still can offer a planar light source with certain uniformity and can be structured thinner.

Abstract: A lighting assembly includes a light engine and a light guide. The light engine edge lights the light guide and includes a control assembly that controls light output according to one or more parameters to produce light output from the lighting assembly with a desired characteristic. Lighting assemblies are combined to form a modular lighting assembly.

Abstract: Provided are: a thin display device that has reduced dimensions between a light guide plate and a display panel; and a television receiver provided with the display device. By threading screws, the edge of an opening and a bottom part press, with an elastic member interposed therebetween, the display panel and the light guide plate together. As a result, the dimensions between the display panel and the light guide plate can be reduced by sandwiching the display panel and the light guide plate by a front cabinet and a back cabinet from the front and back without interposing a support member between the display panel and the light guide plate.

Abstract: This technique provides a display device including an optical unit that is located at a lower section of a housing accommodating a display panel. The optical unit has a unit main body that includes a plurality of light guide members integrally provided at a base, and a case accommodating the unit main body. The light guide members of the unit main body include a receiving light guide member that has an incident surface exposed to a front surface of the housing, an emitting surface for emitting light to a light receiving sensor, and a reflective surface provided between the incident surface and the emitting surface, and an emitting light guide member for guiding light from a light emitting diode to the front surface of the housing.

Abstract: A backlight assembly includes a light guide member extending in a direction and having a light incident surface and a light exiting surface. A light source faces the light guide member and supplies light to the light guide member through the light incident surface. A reflecting member reflects light exiting from the light exiting surface of the light guide member. The reflecting member includes a groove receiving the light guide member. A first reflecting portion is disposed under the light guide member and reflects light refracted by the light guide member in an upward direction. A second reflecting portion is disposed on the light guide member and reflects light refracted by the light guide member in a downward direction.

Abstract: An edge lit luminaire includes a light source. A housing has an interior cavity for receiving the light source. The housing includes a heat sink for directing heat away from the light source. At least one optional end cap is secured to an end of the housing that covers the cavity. A lightguide is secured inside the housing and has an edge located in proximity to the light source. At least one of a reflector and a lens (e.g., lens optic) directs light from the light source to the edge of the lightguide. The lightguide includes a light extraction surface enabling light to be transmitted from the lightguide. The housing can also feature a channel and slot for mounting the luminaire to a support surface. The lens optic can be designed to have specific dimensions that facilitate efficient design and operation of the luminaire.

Abstract: A backlight module includes a laser light source and a light guide plate. The light source locates beside a side surface of the light guide plate. The light guide plate comprises a plurality of transflective films arranged along a direction in alignment the laser light source. When the light from the laser light source emits to the transflective films, a part of the light passes through the transflective films and transmits along a same direction, and another part of the light is reflected by the transflective films and emits into a light diffusion plate. The light beams reflected by the transflective films and into the light diffusion plate have the same intensity.

Abstract: A backlight unit according to an embodiment includes: a light guide plate; a light emitting diode (LED) assembly supplying a light to the light guide plate; and a reflecting plate under the light guide plate, wherein the LED assembly includes: an LED printed circuit board (PCB) disposed at a side of the light guide plate; a plurality of LED chips over the LED PCB, the plurality of LED chips spaced apart from each other; a plurality of first lead frames electrically connecting the LED PCB and the plurality of LED chips; and an LED housing surrounding the plurality of LED chips and the plurality of first lead frames.

Abstract: A light guide plate has a light introduction part having an end face configured to have light incident thereon, and a light guide plate body provided continuously to the light introduction part and comprising a thickness smaller than maximum thickness of the light introduction part. The light guide plate body has a light emitting surface configured to emit light incident from the end face. A directivity conversion pattern is provided on at least one of a face on a light exit side and a face opposite to the face. The directivity conversion pattern converts directivity spread in a thickness direction of the light introduction part to a directivity characteristic which is inclined in a direction parallel to a face direction of the light introduction part. A light reflection wall is provided on the end face.

Abstract: A light guide plate has a light introducing portion configured to confine light that is incident from an end surface, and a light guide-plate main body configured to emit incident light to an outside from a light emitting surface and provided continuously with the light introducing portion in a thickness smaller than a maximum thickness of the light introducing portion. The light introducing portion has an inclined surface inclined toward the light guide-plate main body from a surface having a larger thickness than a thickness of the light guide-plate main body, on at least one of a surface at a light emission side and a surface opposite to the surface at the light emission side.

Abstract: A backlight module includes a light guide plate and a plurality of light sources. The light guide plate includes a light incident part and a flat panel. The light incident part and the flat panel have a common bottom surface. The maximum height of the wedge-shaped light incident part is greater than a height of the flat panel. The light incident part includes a light incident surface perpendicular to the bottom surface and a sloped surface sloping relative to the light incident surface. The flat panel includes a light emitting surface opposite to the bottom surface. The light incident part further includes a reflective layer on the sloped surface. The plurality of light sources is positioned adjacent to the light incident surface.

Abstract: A direct backlight device including a light source arranged on the rear surface of a light-guiding plate and a liquid crystal display apparatus including the backlight device are provided, in which light extracting efficiency from the light-guiding plate is improved and luminance can be prevented from lowering or can be improved. The backlight device includes a light source arranged on the rear surface opposite to a light-emitting surface, and a reflective-angle modified portion, for example, a concave-convex portion formed by sandblast to modify a reflective angle of light emitted from the light source is provided at least on the light-emitting surface and/or the rear surface. A light reflective angle equal to or smaller than the critical angle is modified to improve the light extracting efficiency from the light-emitting surface.

Abstract: In one embodiment, the invention provides backlight comprising a front reflector (102) and a back reflector (104) disposed to form a hollow light cavity (106) with a first light source (108) proximate one end of the front reflector (102) and having a tilt angle (110) of from 5° to 90°, and a first asymmetric light collimator (116) extending between at least the first light source (108) and the back reflector (104) for directing light from the first light source (108) into the hollow light cavity (106).

Abstract: A backlight device (20) is combined with a display device (10) that has a display panel (11), such as a liquid crystal panel. The backlight device includes a chassis (21), a light guide plate (22) and optical sheets (23) arranged on the rear surface of the display panel (11), and an LED package (24) that illuminates an edge face of the light guide plate. A light reflecting face formed of a material that has silver as a main component is provided in the LED package. An adsorbing material (30) that adsorbs gas such as halogen gas and hydrogen sulfide, which have characteristics that lower the reflectance of silver, is coated onto a substrate (25) on which the LED package is mounted.

Abstract: A thickness of a backlight unit is reduced and brightness in a middle portion of a display device is improved. The backlight unit includes a first LED unit 23; a first light guide plate 20 including a light entering surface 20b, and a light exiting surface 20a; and a second light guide plate 21 including a light entering surface 21b, and a light exiting surface 21a. The light exiting surface 21a of the second light guide plate 21 is disposed to overlap at least a portion F of the light existing surface 20a of the first light guide plate 20 that is farthest from the first LED unit 23. Light outputted from the light exiting surface 21a of the second light guide plate 21 enters the first light guide plate 20 at least through a surface of the first light guide plate 20 opposite to the light exiting surface 20a thereof.

Abstract: The present invention provides an optical fiber for backlight module, the optical fiber being a spiral, including: light-incident part to guide in light, near light-incident part close to light-incident part, and faraway light-incident part away from light-incident part; pitch and/or spiral radius of spiral optical fiber gradually decreasing from near light-incident part towards faraway light-incident part. The present invention also provides backlight module and LCD. With spiral optical fiber to guide in light from light source (e.g., LED or CCFL), backlight module and LCD use optical fiber as backlight source of backlight module to separate light and heat inside backlight module to avoid heat-dissipation problem. As such, the present invention effectively improves life span, optical characteristics and reliability of backlight module. Because light source is not inside backlight module, the known heat-dissipation means can be applied to increase life span of light source.

Abstract: A backlight module and a display device comprise: a light guide plate; a LED light bar including a plurality of LED lamps arranged at intervals at a side of the light guide plate so as to emit the light to the light-entering surface of the light guide plate, and a gap provided between the LED light bar and the light guide plate; and a reflection member arranged outside the gap and reflecting the light from the LED light bar toward the light guide plate, wherein first regions and second regions are arranged on the reflection member at intervals, the first regions correspond to positions of the LED lamp, the second regions correspond to an interval between the plurality of LED lamps and/or a position outside the LED lamps at the end of the LED light bar, and the first region has a reflective index less than the second region.

Abstract: A backlight unit is disclosed. The backlight unit includes a light emitting device module, a reflective plate including at least two slopes configured to reflect light emitted from the light emitting device module to an optical member, and the optical member to transmit the light directed from the light emitting device module and the reflective plate. The slope located farther from the light emitting device module has a greater gradient with respect to a horizontal plane than the slope located closer to the light emitting device module.

Abstract: A backlight module including a light guide plate and a light source is provided. The light guide plate has a light incident surface, a light reflection surface, a first side surface and a second side surface. The light incident surface is connected to the second side surface. The reflection surface is connected between the first side surface and the light incident surface. The first and the second side surfaces are two planes with their extending planes intersected. The light incident surface is a chamfering plane connected between the first and the second side surfaces. The light reflection surface is a cambered surface connected between the first side surface and the light incident surface. The light source is disposed next to the light incident surface, so as to transmit light into the light guide plate through the light incident surface.

Abstract: A liquid crystal display device includes a support main having a rectangular frame shape, a reflection sheet in the support main, a light guide plate over the reflection sheet, a light-emitting diode (LED) assembly including LEDs arranged along a light-incident surface of the light guide plate and a printed circuit board (PCB) on which the LEDs are mounted, an LED housing partially covering the LED assembly and including first and second portions, wherein the PCB is attached to the first portion, and the second portion is perpendicular to the first portion, a plurality of optical sheets over the light guide plate, a liquid crystal panel over the plurality of optical sheets, a cover bottom at a rear surface of the reflection sheet and having at least one side wall, and a top cover covering edges of a front surface of the liquid crystal and combined with the support main and the cover bottom.

Abstract: A light guide apparatus for an electronic device is described. The light guide apparatus includes a light guide having a first surface and an second surface; a light source, the light guide and the light source being arranged to couple light from the source into the light guide through the second surface of the light guide, the second surface and the light source defining a gap therebetween; and a reflector positioned above the light source and the light guide, and extending over at least a portion of the gap and at least a portion of the front surface of the light guide.

Abstract: A backlight assembly includes a first light-emitting module, a light guide plate, a receiving container and a main adhesion member. The first light-emitting module includes a first circuit board including a first mounting surface, and a first light source on the first mounting surface. The light guide plate is on the first mounting surface and guides light from the first light source. The receiving container includes a bottom portion and receives the first light-emitting module and the light guide plate. The main adhesion member is between the first mounting surface and the light guide plate and is attached to the first circuit board and the light guide plate, and is between the light guide plate and the bottom portion and movable with respect to the light guide plate.

Abstract: A display assembly is disclosed providing a panel display, a light guiding element having a first surface and a second surface and a light source operable to illuminate the light guiding element. The display further includes a layer of reflective material in contact with the first surface of the light guiding element, wherein the first surface receives light from the light source and transmits the light towards the panel display and the second surface of 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: Disclosed are a reflecting plate capable of preventing inferiority of an image quality due to leakage of light emitted from LEDs to outside, a backlight and an LCD device having the same. An extension portion extending towards an LED substrate is formed on a side surface of the reflecting plate, the side surface where the LEDs are arranged. This may shield light emitted from the LEDs and leaked to a space between the LED substrate and the reflecting plate.

Abstract: A backlight that includes a front reflector and a back reflector that form a hollow light recycling cavity including an output surface is disclosed. The backlight further includes one or more light sources disposed to emit light into the light recycling cavity. The front reflector includes an on-axis average reflectivity of at least 90% for visible light polarized in a first plane, and an on-axis average reflectivity of at least 25% but less than 90% for visible light polarized in a second plane perpendicular to the first plane.

Abstract: An optical element including a light guide plate and a cone-shaped reflector is provided. The light guide plate has a first surface, a second surface, a first side surface and a second side surface. The light guide plate defines a through hole in a middle portion thereof, which is surrounded by the second side surface. The cone-shaped reflector is received in the through hole of the light guide plate. The cone-shaped reflector includes an upper surface and a tapered lateral surface. The tapered lateral surface of the cone-shaped reflector is received in the through hole of the light guide plate. An LED lighting device having the optical element is also provided. Light generated by an LED is reflected by the tapered lateral surface of the cone-shaped reflector to enter the light guide via the second side surface.

Abstract: A backlight operated alternately in a first and a second mode and including a first and a second light source, a light guide, and an optical control member. The light guide is used to receive the light emitted from the second light source, and the optical control member is disposed below the light guide. When the backlight is operated in the first and the second modes, the optical control member has different transmittance with respect to light projected thereon, so as to improve image quality of a liquid-crystal display device using the same.

Abstract: The invention provides a lighting unit (100) comprising a housing (120) including a light source (110). The light source (110) is configured to provide light source light (111) through a light exit part (121) of the housing (120). The lighting unit (100) further comprises a light interception part (130) configured to intercept part of the light source light (111) as intercepted light source light (112), and a luminescent material (140) configured to convert at least part of the intercepted light source light (112) into luminescent material light (141). The housing (120) further comprises a light emitting part (150), configured to allow the luminescent material light (141) escape from the housing (120).

Abstract: Provided is an illumination device for obtaining planar light having satisfactory uniformity and suppressed brightness irregularities. A backlight unit (illumination device) (20) comprises a light source and a light-guiding element (23) for guiding light from the light source. The light-guiding element (23) includes prisms (23q) formed in an end area (22b) on the light source side, and prisms (23i) formed in an area (a light-emitting area (22a)) on the side opposite the light source relative to the end area (22b). The prisms (23q) vary the propagation angle of light spreading in a direction intersecting the direction of light entry, more so than the prisms (23i).

Abstract: A display unit includes a display section, and a light source device. The light source device includes: one or a plurality of first light sources each configured to emit first illumination light; and a light guide plate having a first end surface, a second end surface, and a plurality of scattering regions, and scattering the first illumination light in the scattering regions to emit the light to outside, the first end surface and the second end surface being opposed to each other, and the scattering regions being provided with a constant density and a uniform shape in a predetermined region between the first and second end surfaces. The first light sources are arranged to face at least the first end surface, and an inclined section guiding the first illumination light to the predetermined region is provided between the first light sources and the predetermined region of the light guide plate.

Abstract: In a direct type backlight device of a liquid crystal display device, a light guide plate is used obtain a uniform in-plane distribution of light emission intensity. A reflective sheet (62) having an opening portion is laminated on a front surface of an LED substrate (60), and an LED element (74) is accommodated inside the opening portion. A light guide plate (64) is stacked on the reflective sheet (62). On a front surface of the light guide plate (64), a white reflective film (90) is formed in a non-total reflection region, which is positioned to oppose the LED element (74) and in which an incident angle of light emitted from the LED element (74) to the front surface is smaller than a critical angle. On a rear surface of the light guide plate (64), a pattern made of a white reflective film (92) is formed.

Abstract: A backlight structure includes a light guide plate, at least one light source module, and a reflective cover. The light guide plate has a light incident side and a light-exiting surface, wherein the light-exiting surface is formed at an edge of the light incident side. The light source module includes a substrate and at least one light emitting element, wherein the light emitting element disposed on the substrate emits light to the light incident side. The reflective cover has a first reflecting portion and a second reflecting portion, wherein the second reflecting portion extends from the first reflecting portion disposed between a surface of the substrate and the light incident side of the light guide plate and covers a part of the light-exiting surface, so that the reflective cover reflects light emitted from the light emitting element to the light guide plate.

Abstract: The invention relates to an illumination device, in particular in the form of a luminous emitter (14) for TV recordings, stages, etc. The luminous emitter (14) comprises a light source (29) and a plate-type element (25) arranged in the beam path of the light source (29). The plate-type element (25) comprises two transparent plates (26) with a layer of liquid crystals (22) arranged in between. The liquid crystals (22) are disordered in a first state. The liquid crystals (22) are aligned with one another in a second state. An electrical voltage is applied to the liquid crystal layer in order to change between the states. The invention enables a rapid change between direct illumination and diffuse illumination.

Abstract: A display device includes a backlight unit generating light and a display panel displaying an image using the light from the backlight unit. The backlight unit includes a circuit board, a plurality of light emitting devices, a light guide member including a light incident surface, and a guide member disposed between a surface of the circuit board and the light incident surface. The guide member uniformly maintains a distance between the light incident surface and the light emitting devices. Thus, a light loss is reduced.

Abstract: In order to prevent unevenness in planar light and reduce power consumption, a backlight unit A that emits planar light towards a front side thereof has a light-shielding part 500 provided on a package 50 at least on a front side of the backlight unit. The package 50 has an LED module 5 that surrounds an LED chip 51 that is a light source, and the light-shielding part 500 protrudes towards a light receiving face 22 of a light guide plate 2.

Abstract: To improve a workability in assembling and disassembling of parts of a lighting device. A backlight unit 12 includes an LED board 18 having LEDs 17, a chassis 14, a light guide member 19 having an end portion arranged to face the LEDs 17, a power supply board 21 arranged outside the chassis 14 and supplying drive power to the LEDs 17, and a connector 20 mounted to the chassis 14 and supplying power between the power supply board 21 and the LEDs 17. The connector 20 includes an LED board supporting portion 20a that supports the LED board 18, a power supply board supporting portion 20b having a plate surface along which the power supply board 21 is inserted into and removed from and that supports the inserted power supply board 21, and a connection terminal 28 that comes in contact with the power supply board 21 with allowing relative slide in an inserting and removing direction of the power supply board 21.

Abstract: This disclosure provides systems, methods and apparatus for illumination devices. In one aspect, an illumination device having a longitudinal axis includes a light source and a light guide. The light guide has a peripheral edge, a transmissive illumination surface, a center portion, and an upper surface. The transmissive illumination surface is oriented perpendicular to the longitudinal axis and disposed between the center portion and the peripheral edge. The upper surface is oriented relative to the illumination surface to define an angle ? therebetween. In some implementations, the angle ? can be greater than 15 degrees, for example.