Abstract: An optical film for a display device, includes: a first refractive layer having an upper surface and a lower surface including first projections and second projections extending away from the lower surface in a first direction, the second projections having different heights than the first projections, the first projections having lateral sides with different angles of inclination that decrease in the first direction; and a second refractive layer disposed directly on the upper surface of the first refractive layer, the second refractive layer having a refractive index different from that of the first refractive layer.

Abstract: A display apparatus includes a light-transmitting structural plate, some optical microscopic structures, an optical film, a base plate and some light emitting elements. The light-transmitting structural plate has a first side and a second side opposite to each other. The optical microscopic structures are regularly arrayed and formed on the first side or the second side. The optical microscopic structure has an inclined surface connecting at a connecting line and forming an angle ranging between 30 degrees and 150 degrees with a corresponding inclined surface of an adjacent one of the optical microscopic structures. The optical film is located on the first side. The base plate is separated from the second side by a space. The light emitting elements are located inside the space and disposed on the base plate. The light emitting elements respectively emit a light ray to the light-transmitting structural plate.

Abstract: A light-emitting device includes: a plurality of light-emitting elements arranged in an array on a base member; and a lens that comprises at least four Fresnel lenses disposed above the base member and facing the plurality of light-emitting elements. In a top plan view, a center of each of the plurality of light-emitting elements is offset from a lens center of the corresponding one of the Fresnel lenses of the lens in a direction toward a center of the lens. The plurality of light-emitting elements include at least two first light-emitting elements and at least two second light-emitting elements, wherein an emission color of the first light-emitting elements is different from an emission color of the second light-emitting elements.

Abstract: A switch is disclosed. In some examples, a switch includes a generally cylindrical housing; one or more sets of contact points enclosed by the housing; an indicator module, such as a multi-color LED illuminator, also enclosed by the housing; and a pushbutton actuator disposed to operate the contact points. The housing includes a display section spanning substantially the entire circumference of the housing such that the indication made by the indicator module is visible from all radial directions. When the pushbutton actuator is pressed, some of the contact points open to cut off power from hazards, while others are reconfigured to change the state of the indicator module to indicate the changed status of the switch. Multiple switches can be interfaced with each other, such as by serial connection, to facilitate multi-switch safety environment. Modular cables can be used to conveniently establish the interface.

Abstract: Examples of the present disclosure provide a light distribution element, a light source module and a lamp, the light distribution element includes a light entry surface, a first light exit surface and a second light exit surface, the first light exit surface is configured to receive part of light entering the light entry surface and emit the part of the light entering the light entry surface; the second light exit surface is a reflective surface, and the second light exit surface is configured to receive part of the light entering the light entry surface and reflect the part of the light entering the light entry surface; and a direction of the light emitted from the second light exit surface is different from a direction of the light emitted from the first light exit surface, it can be used for key lighting and lighting ceiling areas respectively.

Abstract: Disclosed are methods for forming a double-sided optical sheet, and a vehicle lamp assembly having the double-sided optical sheet integrated therein. A first optical pattern is imprinted on a first side of a material, and a second optical pattern is imprinted on a second side of the material, opposite the first side. The first and second optical patterns are thereby formed on opposing sides of the same sheet. When oriented adjacent a light source, the double-sided optical sheet homogenizes light emitted from the light source. For a light source having a plurality of lighting elements, the double-sided optical sheet is configured to blend light emitted from the plurality of lighting elements to form one homogenous beam of light output resulting from a single light-modifying member.

Abstract: A navigation light system for an unmanned aerial vehicle, such as a multicopter type unmanned aerial vehicle, includes: a plurality of light emission units. E of the plurality of light emission units has a unit-specific light emission direction and is configured to provide a light output around the unit-specific light emission direction. Each of the plurality of light emission units includes a multi-color light source capable of emitting red light, green light, and white light. The plurality of light emission units are arranged to jointly provide a navigation light pattern around the unmanned aerial vehicle and wherein the light outputs of adjacent light emission units have an overlap the navigation light system is configured to operate each of the plurality of light emission units depending on a relation between a momentary flight direction of the unmanned aerial vehicle and the respective unit-specific light emission direction.

Abstract: An optical device includes a reflector-section that includes a light-ingress surface for receiving light from a light source, a reflector surface for reflecting the light based on total internal reflection, and a light-egress surface through which the reflected light exits the optical device. When the light source is at a predetermined position with respect to the optical device, an angle of incidence (?i) of the light at the light-egress surface is a polarization angle at which a p-polarized component of the light is transmitted through the light-egress surface without being reflected by the light-egress surface. Thus, unwanted reflections at the light-egress surface can be reduced and thereby unwanted scattering of light is reduced while having good transmitting efficacy.

Abstract: An optical device includes a reflector-section that includes a light-ingress surface for receiving light from a light source, a reflector surface for reflecting the light based on total internal reflection, and a light-egress surface through which the reflected light exits the optical device. When the light source is at a predetermined position with respect to the optical device, an angle of incidence (?i) of the light at the light-egress surface is a polarization angle at which a p-polarized component of the light is transmitted through the light-egress surface without being reflected by the light-egress surface. Thus, unwanted reflections at the light-egress surface can be reduced and thereby unwanted scattering of light is reduced while having good transmitting efficacy.

Abstract: Disclosed are a lamp for a vehicle and a vehicle including the same, the lamp including: a light source configured to emit light beams; a first optical part provided in front of the light source; and a second optical part provided in front of the first optical part, in which the second optical part includes: an MFL region including a plurality of facet lenses and having level differences on boundaries between the plurality of facet lenses; and a convex lens region provided at one side of the MFL region and having a shape convex forward.

Abstract: A light emitting diode (LED) light source is disclosed. The LED light source comprises a lens structure that includes a hemispherical dome with a base. The LED light source comprises a cavity in the base. The cavity has an opening and a taper such that a cross-section area within the cavity is smaller than an area of the opening. The LED light source comprises a light emitting device comprising an LED die contacting the taper. The taper allows for easy insertion of the LED die into the lens structure. The taper serves to accurately align the LED die when the LED die is inserted.

Abstract: The present invention describes an image display apparatus for directing an image towards an observer. The apparatus comprises a source of image point rays; a collimating device configured to collimate image point rays to produce collimated image rays; and, a prism sheet configured to receive the collimated image rays. The prism sheet comprises an array of micro-prisms, each micro-prism having two reflective facets arranged such that each collimated image ray is reflected off one facet and then an adjacent facet. Reflection from the second facet reorients the collimated image rays towards an image observation zone. The collimated image rays from an upper portion of the prism sheet converge with collimated image rays from a lower portion of the prism sheet within the image observation zone. The present invention also describes a method for directing an image towards an observer.

Abstract: A light redirecting film, a backlight including the light redirecting film, and a display system including the backlight are described. The light redirecting film may be a microstructured film including a plurality of substantially parallel spaced apart structures on a substrate. The backlight includes a plurality of discrete spaced apart light sources configured to illuminate a plurality of non-overlapping illumination zones in a display surface in a one-to-one correspondence relationship; and a microstructured film disposed on the plurality of light sources, such that when the display surface is disposed on the microstructured film and the light sources are energized, at least 80% of light emitted by each light source illuminates a corresponding illumination zone in the display surface, and a luminous intensity distribution across the plurality of the illumination zones has an average I and a standard deviation S, where S/I<1.

Abstract: The light device comprises an internal chamber (2) that is covered by a translucent cover, which separates the light device from the external surroundings of the motor vehicle; inside the chamber, there is at least one lighting unit (3) whose active area (4) for the exit of light rays (10) from the lighting unit (3) is situated opposite the translucent cover and contains a light-conductive core (15) of an optically transparent material with an associated light unit (7) located opposite the entry area (9) of the light-conductive core (15) to emit light rays (10) into the body (14) of light-conductive core (15). Between the light-conductive core (15) and the translucent cover there is a functional layer (23) configured to focus the beams of light rays (10) that exit its surface averted from the light-conductive core (15) in a predetermined direction.

Abstract: A vehicular lamp includes: a plate-like lens body including a front surface and a rear surface; and a light source provided at the rear of the lens body and emitting light rays of uniform luminance which are irradiated forward through the lens body to form a predetermined light distribution pattern. The front surface includes front lens cuts; the rear surface includes rear lens cuts facing the front lens cuts, respectively; the rear lens cuts are provided in respective inclined postures so that the output directions of light rays having entered the lens body while being refracted by the respective rear lens cuts and having been outputted through the respective front lens cuts are the same as one another; and distances between the rear lens cuts and the front lens cuts are adjusted so that the luminances of light rays outputted through the respective front lens cuts are made uniform.

Abstract: Various embodiments include a multi-color micro-LED array light source that enables well-overlapped light beams of different colors. The multi-color micro-LED array light source includes a thermally conductive substrate and multiple arrays of different color micro-LEDs integrated on the thermally conductive substrate. The micro-LEDs within each array are electrically connected so that they can all be driven in unison. The multi-color array light source also includes a controller that is electrically coupled to and that drives the arrays of micro-LEDs. The controller drives the micro-LEDs in a manner that produces an output light distribution with a spatial wavelength and angular distribution that is suitable for use as a light source.

Abstract: The present disclosure relates to a backlight unit and a display device including the backlight unit. The backlight unit includes a first pattern in a first region of a light guide plate including a light incidence surface and a second pattern in a second region of the light guide plate extending from the first region, so that, in the first region, a directional angle of light can be improved so as to prevent the occurrence of hot spots, and in the second region, a line light source can be converted into a plane light source.

Abstract: A lighting system comprising an array of LEDs, collimators for collimating the light output from the LEDs and a lightguide mounted over the array of collimators. The lightguide comprises an elongate structure having a length direction with one light input end mounted over the collimators, wherein the general shape in cross section perpendicular to the length direction comprises a non-circular arc. The array of LEDs is mounted following a corresponding non-circular arc. Light extraction features are provided for out-coupling light from an outer arcuate surface of the lightguide. The non-circular arc formed by the outer surface of lightguide enables a non-uniform light output distribution to be formed. The shape of the surface can thus be used to control the directional light output.

Abstract: Provided is a light-emitting apparatus including a substrate, an LED light source disposed on the substrate, and a reflecting frame disposed laterally of the LED light source on the substrate, wherein the LED light source includes a side-emitting LED device which is disposed on the substrate, and which emits light laterally toward the reflecting frame, and a top-emitting LED device which is disposed above the side-emitting LED device on the substrate so as to straddle the side-emitting LED device and so as to not block a portion of the light emitted from the side-emitting LED device, and which emits light upward, the light being different in color than the light emitted from the side-emitting LED device, and wherein the reflecting frame is disposed so that the light emitted from the side-emitting LED device is reflected upward.

Abstract: Light control films, and lighting devices including the same, are disclosed. The light control films include a single layer of light transmitting material having a first side and a second side. A plurality of first microstructures are formed in the first side. The first microstructures are configured to receive incident light from a light source and produce an off axis (e.g. batwing) light distribution in a field downstream of the second side of the light control film. In some embodiments, a plurality of second microstructures is formed on the second side of the light control films and are configured to reduce the glare produced by light emitted from the light source passing through the film.

Abstract: A light emitting diode lighting assembly for mounting to a curved mounting surface, such as a vehicle surface, includes a plurality of light emitting diodes, a circuit board, and a molded polymer section for surrounding and insulating the LEDs against the circuit board. The lighting assembly also includes a lens and a flexible molded housing surrounding a perimeter of the lens and the circuit board for sealing the lens to the circuit board.

Abstract: There are provided a light emitting device package and a method for manufacturing the same. The light emitting device includes: a plurality of barriers provided above a metal circuit board; a plurality of light emitting devices placed in a space between the barriers; and a lens unit provided at an upper side of the barrier. Accordingly, the plurality of light emitting devices can be conveniently seated as a module format, and a luminance can be increased. Also, an efficiency of heat sink can be increase.

Abstract: A lighting fixture includes a front end-portion having an edge defining a light opening and a back end-portion spaced from the opening which has a centerline. At least one LED emitter on the mounting board disposed at the back end-portion for directing light toward the opening, the emitter(s) being off-centerline in a first lateral direction. A lens for the emitter(s), the lens being configured for distribution of light from the emitter(s) primarily in a second lateral direction which is opposite the first lateral direction such that the light passes through the light opening at a portion of the edge that is off-centerline in the second lateral direction, thereby to widen the illumination angle from the fixture.

Abstract: A light guide plate with multi-directional structures includes a main body, a plurality of first microstructures and a plurality of second microstructures. The main body includes a light-incident surface, a light-emitting surface and a reflecting surface. The light-incident surface connects the light-emitting surface and the reflecting surface. The first microstructures are disposed on the light-emitting surface or the reflecting surface and arranged along a first extending direction. The second microstructures are disposed on the light-emitting surface or the reflecting surface and arranged along a second extending direction. The second microstructures and the first microstructures are disposed on the same plane and intersect with each other. Each of the second microstructures is a single stripe pattern, and has a width which becomes gradually smaller from one end of the second microstructure near the light-incident surface to the other end of the second microstructure away from the light-incident surface.

Abstract: This invention relates to a method of designing an illumination device, wherein a light source unit is modeled with a set of rays. Therein, each ray is assigned a light power and is further characterized by a light volume, which specifies how “spread out” the light is in area and angle. In this way, a selection of rays with respect to their “density” becomes possible, and an optical system can be optimized for a transmission of those rays providing the most light per volume.

Abstract: A lighting assembly includes a number of LEDs and an optical element proximate each one of the LEDs. The optical elements are configured to direct light from that LED toward an area, such that the light intensity from each optical element is substantially uniform across all of the area. Each optical element includes a first element, a second element, and a third element that extends beyond the first and the second elements.

Abstract: An optical element for a light source and a lighting system using the optical element are disclosed. In example embodiments, the optical element includes an entry surface and an exit surface opposite the entry surface. The entry surface includes at least three subsurfaces, wherein each subsurface is disposed to receive light rays leaving light source. Each of the three subsurfaces is geometrically shaped and positioned to receive light rays entering the optical element through that subsurface in order to direct the light passing through the optical element. In some embodiments the optical element includes a concentrator lens disposed in the exit surface. The optical element can also include a mixing treatment. A lighting system can include multiple optical elements, each paired with a light source such as an LED or LED package.

Abstract: A time sequence energy saving color splitting system includes at least one light source provided on a surface of the guide module and composed of multiple light illuminating elements capable of illuminating light beams with different wavelengths and arranged in array, the at least one light source being able to illuminate light beams with specific wavelengths in two time sequences and entering the guide module and a color splitting module provided on the guide module, comprised of a first surface and a second surface, wherein the first surface is a collar structure per unit cycle and the second surface is a non-spherical structure per unit cycle, the non-spherical structure per unit cycle corresponds to the collar structure every two unit cycles.

Abstract: A lens member includes a central axis, a light-incident side including a Fresnel-lens surface provided with a plurality of annular prisms concentrically arranged with respect to the central axis, and a light-exit surface opposite to the light-incident side. The Fresnel-lens surface further includes an annular lens portion that is concentrically arranged with respect to the central axis and that is extended to be longer and wider than the plurality of annular prisms. Provided is an optical unit in which a light source and a lens member are combined, and parts are disposed in a space provided in an outer periphery of the annular lens portion.

Abstract: Dual-sided optical films have extended prisms formed in one major surface, and extended lenslets formed in an opposite major surface. Some or all of the prisms are compound prisms, in which the two inclined surfaces of each compound prism each include a tip portion, a base portion, and an intermediate portion disposed between the tip portion and the base portion, the intermediate and tip portions forming a concave shape and the intermediate and base portions forming a convex shape, or vice versa. When obliquely incident light, e.g. from a light guide, is incident on the prism side of the film, an output beam emerges from the lenslet side of the film. The output beam has an intensity distribution with a sharp left beam edge and a sharp right beam edge, these beam edges having 10%-to-90% transition angles of no more than 7, 6, 5, 4, 3, or 2 degrees.

Abstract: The present disclosure relates to an optical sheet for controlling the direction of light rays which is used for manufacturing backlight units of TFT-LCDs for computer monitors and televisions, and more specifically to an optical sheet which can uniformly diffuse light, improve brightness, and adjust viewing angle. There is provided an optical sheet for controlling the direction of light rays comprising a substrate film; a microlens group arranged on a first face of the substrate film; and a plurality of protuberances formed on a second face of the substrate film, wherein each protuberance comprises a reflective layer at the bottom thereof, and the plurality of protuberances comprise an aperture formed therebetween, and wherein a unit microlens of the microlens group has a first side and a second side with different radii of curvature from each other with respect to a light emission control part thereof.

Abstract: A fragmented lens system for creating an invisible light pattern useful to computer vision systems is disclosed. Random or semi-random dot patterns generated by the present system allow a computer to uniquely identify each patch of a pattern projected by a corresponding illuminator or light source. The computer may determine the position and distance of an object by identifying the illumination pattern on the object.

Abstract: A backlight device 12 includes cold cathode tubes 17, a chassis that houses the cold cathode tubes 17 therein and having an opening 14b through which light emitted from the cold cathode tubes exits, and a diffuser plate 15 provided so as to face the cold cathode tubes 17 and cover the opening 14b. A light reflecting portion 30 is formed on a side of the diffuser plate 15 close to the cold cathode tubes 17 so as to have different light reflectance in every surface area of a surface of the diffuser plate 15. A scattering structure 31 is formed on a side of the diffuser plate 15 opposite from the cold cathode tubes 17 and scatters the light.

Abstract: An optical component comprises a carrier plate (1) having a first main surface (2) and a second main surface (3) facing away from the first main surface (2), and a first lens structure (4) on the first main surface (2), wherein the first lens structure (4) has at least a first lens element (41) having a first polygonal form and a second lens element (42) having a second polygonal form, the first lens structure (4) completely covers the first main surface (2), and the first lens element (41) and the second lens element (42) are non-congruent with respect to one another and/or differ in terms of their orientation on the first main surface (2) of the carrier plate (1).

Abstract: An illuminating device has a light source that includes a plurality of light emitting devices and a phosphor; and a lens sheet that stays on an optical axis of the light source, the lens sheet having a plurality of prisms that is symmetrically arranged with respect to the optical axis of the light source. The plurality of prisms is configured at least on a surface of the lens sheet in which to face the light source, and a plurality of light scattering elements is configured at least on a surface of the lens sheet in which not to face the light source.

Abstract: A lens array module includes a light incident surface, a light emitting surface opposite to the light incident surface, and a plurality of first and second lens surfaces. The first lens surfaces are arranged on the light incident surface to form into an array. The second lens surfaces are arranged on the light emitting surface to form into an array. The center of curvature of each of the first lens surfaces located at two opposite sides of a first reference point on the light incident surface deviates away from the first reference point in a direction parallel to a first reference axis, and the center of curvature of each of the second lens surfaces located at two opposite sides of a second reference point on the light emitting surface deviates toward the second reference point in a direction parallel to the first reference axis. A projection apparatus is also provided.

Abstract: A LED light bulb (10, 110, 210) having at least one LED (30a-d, 230). Light output from the LED is directed toward an offset scattering optics structure (50, 150, 250) that intersects and scatters the light output. The LED may optionally be paired with a narrow beam optical piece (32a-d, 132a-d, 232) to focus and direct the light output of the LED toward the scattering optics structure. A mounting structure (40, 140, 240a, 240b) may support the scattering optics structure and offset the scattering optics structure from the LED.

Abstract: A cavity illumination system according to the present disclosure may include one or more illumination elements composed of a transparent or semi-transparent, biocompatible sterilizable polymer and one or more illumination sources. The sterilizable polymer operates as a waveguide. An illumination element may incorporate micro structured optical components such as for example gratings, prisms and or diffusers to operate as precision optics for customized delivery of the light energy. The micro structured optical components may also be used to polarize and/or filter the light energy entering or exiting the illumination element.

Abstract: A vehicle light using a projection lens of a novel appearance can provide a feeling of solidness as compared to a simple spherical shape. The vehicle light can include a projection lens having an optical axis and a plurality of separate lens portions divided in a radial pattern with respect to the optical axis of the projection lens. The separate lens portions can have respective light exiting surfaces of different curvatures, and respective light incident surfaces, the shapes of which are determined such that the separate lens portions have the same thickness and the same focal point.

Abstract: A phosphor plate may be provided that includes a base plate transmitting light; and a lens being disposed on at least one of both surfaces of the base plate and including a fluorescent material.

Abstract: A light distribution controller of a light-emitting device includes a first optical member formed of ZnO disposed over an LED interposing a transparent adhesive, and a second optical member which covers the first optical member. The first optical member includes a first concave portion having an opening in a regular hexagon shape whose area gradually increases. In the first concave portion, inner wall surfaces having inclined surfaces, each of whose bases is formed by one side of the hexagon of the opening shape, are formed. Outside of the first optical member, outer wall surfaces each having a trapezoidal shape are formed. The second optical member includes a second concave portion arranged so that light at an annular peak in the light distribution characteristic of the light traveled through the first optical member is totally reflected.

Abstract: An aircraft external lighting system and method is applicable to aircraft position, navigation and strobe lights. The lighting system includes a light source, a cylindrical lens adjacent the light source, and a lenticular lens between the light source and the cylindrical lens.

Abstract: A light redirecting film (100) includes a first major surface (110) that includes first microstructures (150) that extend along a first direction and a second major surface (120), which may form part of a matte layer, the second major surface being opposite to the first major surface and including second microstructures (160). The second major surface has an optical haze that is not greater than about 3% and an optical clarity that is not greater than about 85%. The light redirecting film has an average effective transmission that is not less than about 1.75. The light redirecting film (100) may comprise particles. The second microstructures may have a slope distribution.

Abstract: A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis.

Abstract: An illuminating lens includes a main body and a ring portion. The main body has a light exit surface, and the light exit surface has a first light exit surface recessed toward a point on the optical axis and a second light exit surface extending outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region in the center thereof, and a total reflection region on the peripheral side thereof. The ring portion has a back surface configured to guide the light that has been emitted from a light source, totally reflected repeatedly at the light exit surface, and then entered the ring portion to an end surface by total reflection.

Abstract: A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A reflective layer is formed on a bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface.

Abstract: The present invention provides a light control film that can prevent generation of a moiré pattern when it is superimposed on another member having a regular structure while securing sufficient front luminance, and a backlight device using the same. The light control film of the present invention has a light control layer provided with an uneven pattern on a surface, and in this uneven pattern, a plurality of convexes having circular bases of approximately the same diameters are arranged so that the bases thereof should not overlap with one another and each should touch one or two or more other bases, and ratio of convexes arranged so that each of circular bases thereof should touch both bases of two convexes of which bases touch each other is controlled to be 50 to 92% among the total convexes arranged. The backlight device of the present invention is a backlight device incorporated with the aforementioned light control film.

Abstract: Embodiments described herein provide apparatus and methods for processing semiconductor substrates with uniform laser energy. A laser pulse or beam is directed to a spatial homogenizer, which may be a plurality of lenses arranged along a plane perpendicular to the optical path of the laser energy, an example being a microlens array. The spatially uniformized energy produced by the spatial homogenizer is then directed to a refractive medium that has a plurality of thicknesses. Each thickness of the plurality of thicknesses is different from the other thicknesses by at least the coherence length of the laser energy.

Abstract: Optical devices for guiding illumination are provided each having a body of optical material with staircase or acutely angled ramp structures on its top surface for distributing light inputted from one end of the device from the front exit faces of such structures along certain angular orientations, while at least a substantial portion of the light is totally internally reflected within the body until distributed from such front exit faces. Optical devices are also provided each have a body of optical material having a bottom surface with acutely angled ramp structures and falling structures which alternate with each other, such that light is totally internally reflected within the device until reflected by such ramp structures along the bottom surface to exit the top surface of the device or transmitted through the ramp structures to an adjacent falling structure back into the device.

Abstract: A backlight module includes a light guide plate and a plurality of light sources. The light guide plate includes a wedge-shaped light incident part and a flat panel. The wedge-shaped light incident part and the flat panel have a common bottom surface. The height of the wedge-shaped light incident part is greater than that of the flat panel. The wedge-shaped light incident part includes a light incident surface perpendicular to the bottom surface and a sloped surface sloping relative to the light incident surface and connects to the flat panel. The sloped surface defines a plurality of V-shaped grooves for preventing light leak. The flat panel includes a light emitting surface opposite to the bottom surface. The plurality of light sources is positioned adjacent to the light incident surface.