Abstract: An adjusting mechanism for a rod module adapted to an optical engine is provided. The adjusting mechanism utilizes two wedge-shaped blocks moving in perpendicular directions so as to convert the vertical adjustment of horizontal adjusting component into horizontal adjustment of an LIR module. Therefore, operators may adjust the horizontal and vertical position of the rod module from the same side of the projector, thus increasing the convenience in adjusting the position of the rod module.

Abstract: Provided is a planar lighting device having a thin shape and capable of emitting uniform illumination light with less brightness unevenness. The planar lighting device includes a first and a second light sources arranged at a given distance apart from each other and a light guide plate arranged between the first and second light sources. The light guide plate includes a light exit plane, a first light entrance plane facing the first light source and containing one side of the light exit plane, and a second light entrance plane facing the second light source and containing the opposite side to the one side, and has a shape growing thicker from the first and second light entrance planes toward the center. The light guide plate contains scattering particles for scattering light entering through the first and second light entrance planes and propagating inside by a ratio satisfying 1.1??·Np·LG·KC?8.2.

Abstract: A backlight arrangement (100) comprising at least a light source (101) and a waveguide plate (102) comprising a front surface (104) and an opposing back surface (103) and at least one surface (107) for receiving light from said light source (101), said surface for receiving light connecting said front and back surfaces is provided. At least one of said front surface (104) and said back surface (103) is a facetted surface comprising a plurality of planar parallel portions (105) and a plurality of facets (106) connecting said planar parallel portions. The facets (106) are formed such that the thickness of said waveguide plate (102) decreases stepwise with the distance from said surface (107) for receiving light, and such that at least part of the light received into the waveguide plate (102) via said surface (107) for receiving light is extracted from said waveguide plate (102) through said facets (106).

Abstract: In one aspect, a planar illumination area includes two light-guide elements, each with an out-coupling region. At least a portion of each out-coupling region overlaps with at least a portion of the other. The overlapping region emits a substantially uniform light output power.

Abstract: In a cellular phone, a light guiding plate, which linearly guides light emitted by a plurality of light emitting elements (LEDs), and an LED display unit, which displays predetermined LED displays, are laminatedly arranged in a movable-side housing. A slit formed in the substantially central portion of the light guiding plate partitions the light guiding plate into a first light guiding region and a second light guiding region. A first light emitting group of the light emitting elements emits light to the first light guiding region and a second light emitting group of the light emitting elements emits light to the second light guiding region. The first light guiding region and the second light guiding region are illuminated alternately by alternately switching ON the first light emitting group and the second light emitting group.

Abstract: An apparatus for providing a multicolored illuminator is disclosed. In one embodiment, the apparatus comprises a first sheet comprising a plurality of columnar illuminators stacked side by side, and a plurality of colored light sources placed along an edge of the first sheet. The plurality of columnar illuminators diffuse light generated by the plurality of colored light sources. The light emanates in a predetermined pattern.

Abstract: A backlight device includes a main light guide plate, auxiliary light guide portions provided on the side of an opposed surface of the main light guide plate, and light sources arranged to emit light into the auxiliary light guide portions. A reflector is arranged to surround the introduction surface of the main light guide plate and the auxiliary light guide portions. Furthermore, an optical path forming member is provided on the inside of the reflector so as to form a dedicated optical path from the auxiliary light guide plate to the main light guide plate. Thereby, the light emitted from one auxiliary light guide portion is prevented from entering into another auxiliary light guide portion.

Abstract: A backlight unit capable of improving contrast properties by implementing a local dimming method while making the backlight unit slim, and a liquid crystal display using the same are provided. The backlight unit includes a first light guide plate array including a plurality of first light guide plates arranged in parallel in a first direction to define a first light guide channels; a second light guide plate array including a plurality of second light guide plates arranged in parallel in a second direction intersected with the first direction to a second light guide channels; a first light array arranged near at least one end of the first light guide plate array to illuminate light to the at least one end of the first light guide plate array; and a second light array arranged near at least one end of the second light guide plate array to illuminate light to the at least one end of the second light guide plate array.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of first conical frustum-shaped depressions (211) defined at the outer surface. The second transparent layer includes an outer surface (230) and a plurality of second conical frustum-shaped depressions (231) defined at the outer surface. The first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of elongated V-shaped protrusions at an outer surface thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of micro-recesses at an outer surface thereof that is distalmost from the first transparent layer. Each micro-recess is a frustum of an inverted pyramid in shape. A direct type backlight module using the optical plate is also provided.

Abstract: An illuminating apparatus providing polarized color light and a display apparatus including the illuminating apparatus are provided. The illuminating apparatus includes a light source; a polarization light guide plate (LGP) unit which converts a polarization direction of light emitted from the light source into linearly polarized light, and collimates the linearly polarized light; and a cholesteric liquid crystal color filter which disposed on an upper portion of the polarization LGP unit, and selectively reflects light according to a polarized status and a wavelength of the light.

Abstract: A luminaire includes a waveguide having first and second opposing ends and first and second opposing sides between the first and second ends. The waveguide is configured to totally internally reflect light propagating through the waveguide in a first direction and direct light propagating through the waveguide in a second direction through at least one of the first and second sides. A reflective body is coupled to the second end of the waveguide and configured to reflect light propagating towards the second end of the waveguide such that the light propagates towards the first end of the waveguide.

Abstract: The illumination device is provided with a plurality of light guide bodies, the bottom face of which is given light reflection/scattering treatment, light sources individually connected to the end portions of a plurality of the light guide bodies to radiate the bottom faces of a plurality of the light guide bodies, and a control unit for changing the intensity of light made incident from the light sources to a plurality of the light guide bodies. A plurality of the light guide bodies are laminated so as to be at least partially overlapped at the respective light emitting regions of the light guide bodies, and the control unit allows the intensity of light made incident from the light sources to the light guide bodies to change with the lapse of time.

Abstract: A light guide module and a display device with the light guide module are disclosed. The light guide module includes a rigid light guide film and a soft light guide film. The soft light guide film is pasted on the rigid light guide film. The soft light guide film has a first surface, and a pattern is formed on the first surface. The area of the first surface without the pattern is pasted on the rigid light guide film. The pattern is positioned between the soft light guide film and the rigid light guide film. The display device includes at least one light guide module and a light source located at one side of the light guide module. When the light source is on, the pattern is lit and visible.

Abstract: A layered light guide structure has a number of planar light guides arranged in a stack to receive a number of different color light beams from the edge of the light guides. Each of the planar light guides has one or more diffractive structures imparted or provided on its upper surface. The diffractive structures on each light guide are configured to diffract light of a particular wavelength range so that they efficiently diffract the guided light within that light guide. The diffractive structure can be one or more keypad symbols such that the layered light guide structure can be used as a keypad. The symbols can be pixelized such that the pixels can have different color patterns. The diffractive structure can also be a simple patch so that the layered light guide structure can be used as a back-light source.

Abstract: A lighting device includes a plurality of light-transmitting guide plates 1, 2, 3 laminated in at least three layers and a plurality of light emitting elements 4, 5, 6 arranged so as to oppose to respective lateral sides of the light-transmitting guide plates 1, 2, 3 to allow luminance flux in different color with respect to each light-transmitting guide plate to be incident on the corresponding light-transmitting guide plate. Each of the light-transmitting guide plates 1, 2, 3 has a plurality of reflecting surfaces 7, 8, 9 formed on the backside of the plate to change a propagation direction of the luminance flux propagated in the each light-transmitting guide plate, allowing the luminance flux, of which propagation direction has been changed by the reflecting surfaces 7, 8, 9, to be emitted from the front side of the each light-transmitting guide plates.

Abstract: A backlight for a stereoscopic 3D liquid crystal display apparatus includes a light guide formed from a plurality of segments. Each segment has a first side and a second side opposite the first side, and a first surface extending between the first and second sides and a second surface opposite the first surface. The first surface substantially re-directs light and the second surface substantially transmits light. The plurality of segments are arranged substantially in parallel with the second surfaces transmitting light in substantially the same direction to provide backlighting for a stereoscopic 3D liquid crystal display. A light source is disposed along only one of the first side or second side of each segment for transmitting light into the light guide from either the first side or second side. Each segment light source is selectively turned on and off in a particular pattern.

Abstract: Alight guide plate assembly for a backlight module is provided. The light guide plate assembly includes a plurality of light guide plates. Each light guide plate has a top face, at least one side face, and at least one connecting part. The connecting part is formed on the side face of the light guide plate. The connecting part has a connecting face, wherein the adjacent connecting faces are connected to each other. The top faces of the plurality of light guide plates are coplanar. A distance between the connecting face and the top face is ? to 1/20 of the thickness of the light guide plate.

Abstract: A double-side illumination apparatus includes a light source, an isotropic light guide plate including an incident plane on which light emitted from the light source is incident, an opposite plane facing the incident plane, and upper and lower surfaces through which the light is out-coupled. Isotropic micro-structures are formed on the upper and lower surfaces of the isotropic light guide plate, respectively, and first and second anisotropic layers are respectively formed on the upper and lower surfaces of the isotropic light guide plate so as to completely cover the isotropic micro-structures. Herein, the first and second anisotropic layers have different refractive indices with respect to light having first and second polarization components that are perpendicular to each other.

Abstract: The present invention provides an illumination module, and a display and a general lighting apparatus using the same. Said illumination module includes a plurality of light guiding strips arranged in juxtaposition with a predefined distance; a plurality of light sources, disposed on at least one end of said light guiding strips respectively for providing the light into said light guiding strips; and a plurality of light reflecting units, disposed between said light guiding strips for reflecting the light from said light guiding strips. The light reflecting units according to the present invention can guide the light from the sides of light guiding strips or other light not toward the right side of the illumination module back to the right side of the illumination module, and thus improving the light output efficiency and uniformity.

Abstract: An illumination apparatus includes: a light guide plate composed of a plurality of aligned blocks; and a plurality of light sources, each being provided for one of the blocks and emitting light to the one block. A gap of 0.1 microns or more is formed in at least part of a region between the adjacent blocks. An inside of the gap serves as an air layer.

Abstract: A heads-up display comprises a monochrome display device for generating an image and an optical device for generating a virtual image from the image of the display device. The monochrome display device comprises a display and a backlight for illuminating the display from its backside. The backlight comprises a first light source emitting light of a first color, a second light source emitting light of a second color, a first light guide coupled to the first light source, and a second light guide coupled to the second light source. The first and second light guides are disposed in such close juxtaposition behind the display so that they illuminate together the entire backside of the display and illuminate a first region of the display associated with the first light guide with the first color and a second region of the display associated with the second light guide with the second color.

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

Abstract: A billboard (100) includes a light module (120) and a light-permeable panel (140). The light module comprises a plurality of elongated light conductors (122) and at least one LED (124). Each of the light conductors has two end surfaces (1222, 1224) and a circumferential lateral surface (1223) interconnected between the end surfaces, and one of the end surfaces of each of the light conductors is adjacent to and optically coupled to the at least one LED. The light-permeable panel has a light incident surface (142) and an opposite light emitting surface (144). One of the light incident surface and the light emitting surface has a pattern (143).

Abstract: A light guide plate includes a first light guide body having a light incident plane, a first connection surface, and recesses and a second light guide body having a light emitting plane, a second connection surface opposite to the light emitting plane, and protrusions. The recesses are disposed on the first connection surface. Each of the recesses has a bottom plane parallel to the light emitting plane. The light incident plane intersects with the first connection surface. The first connection surface contacts the second connection surface. The protrusions are disposed on the second connection surface and fill the recesses respectively. Cross-sectional planes of each protrusion parallel to the light emitting plane decrease gradually in a direction towards the bottom plane of the corresponding recess. A terminal thickness of the second light guide body is less than that of the first one.

Abstract: A structure for protecting a rod integrator that is used for a projection display apparatus is provided. The structure has: a protecting tube for the rod integrator, the protecting tube accommodating the rod integrator therein, wherein the protecting tube has openings which are defined at positions that face a light incident surface and a light exiting surface of the rod integrator, respectively; and a light shield plate that is provided between the opening and a light source for emitting light to the rod integrator, the opening facing the light incident surface of the rod integrator, wherein the light shield plate has an opening for allowing light to pass therethrough so that the light is incident on the rod integrator.

Abstract: A surface light source device improves the quality of illumination without producing dark lines between neighboring light guide plates even when a plurality of light guide plates are used in combination. This surface light source device is formed by combining a plurality of LED/light guide plate units, and light guide plate (4) has: light emitting area (8) of a square shape from a plan view; extended area (10) which is positioned extending outward from a pair of neighboring sides (8a) and (8b) in four sides (8a) to (8d) defining the outer rim of this light emitting area (8); and incidence surface area (11) on which light from LED (6) is incident. Each light guide plate (4) has a symmetrical shape with respect to one of the diagonal lines of light emitting area (8), and is combined by making its orientation uniform in the same direction.

Abstract: Provided is an all-in-one type light guide plate including a plurality of prism-shaped structures that are integrally formed on the all-in-one light guide plate and which totally internally reflect light incident from a light source and emit the totally internally reflected light.

Abstract: An adjusting device for positioning an integration rod within an optical engine module is provided. The optical engine module includes a casing having four sidewalls defining an optical path. The integration rod is disposed in the optical path. Each sidewall has a screw hole. The adjusting device includes two adjusting screws extending through the screw holes in two adjacent sidewalls of the casing in order to abut against the integration rod, thereby adjusting the position of the integration rod in the optical path and two positioning screws extending through the screw holes in remaining two adjacent sidewalls of the casing to abut against the integration rod for immobilizing the integration rod within the casing.

Abstract: A structure for attaching a fluorescent tube includes a base, a holder supported by the base, and a pair of contacts. The holder holds an intermediate portion of the fluorescent tube while restraining the fluorescent tube from moving in a radial direction. To the pair of contacts, terminals of a pair of end portions of the fluorescent tube are respectively attachable in an attaching direction corresponding to the radial direction of the fluorescent tube. Each contact includes a pair of elastic pieces facing each other. The pair of elastic pieces have a pair of straight portions extending substantially straight along the attaching direction and facing each other. On the pair of straight portions, a pair of contact portions for clamping the corresponding terminal of the fluorescent tube therebetween are formed.

Abstract: A light guide plate has a light incident surface, a light emitting surface and a bottom surface. The bottom surface or the light emitting surface has a plurality of light guide units disposed thereon. Each of the light guide units has a first curved surface and a second curved surface connected with the first curved surface. Both of the first curved surface and the second curved surface are concave surfaces or convex surfaces. In a cross section perpendicular to the light incident surface and passing through the first curved surface and the second curved surface, the first curved surface and the cross section intersect in a first curved line, and the second curved surface and the cross section intersect in a second curved line. A curvature radius of the first curved line is greater than that of the second curved line.

Abstract: A light guide plate has an emission face provided with a plurality of projection rows. Each projection row consists of a pair of slopes, a first slope (a slope far from an incidence end face) and a second slope (another slope near to the incidence end face). An inclination angle of the first slope with respect to an imaginary plane perpendicular to a frontal direction decreases gradually in first region on the emission face (or back face) according to an increasing distance from the incidence end face, then increasing gradually in second region according to an increasing distance from the incidence end face. The inclination angle at an incidence-end-face-side end of first region is greater that at a distal-end-face-side end of second region. Variation of the inclination angle in the first region is greater that in the second region.

Abstract: A hybrid lighting panel may have a first light guide and a second light guide proximate to the first light guide. The first light guide may receive light from a light source such as an LED array. The first light guide is configured to distribute the light along the length of the first light guide and distribute the light out a first light guide face such that light exiting the first light guide face enters the second light guide. The second light guide is configured to distribute light across the width of the second light guide and distribute light out a second light guide face. Hybrid lighting panels may be used individually or assembled as a system to provide light. A controller can control lighting to each panel to allow for individual dimming. One or more panels may be used to backlight an LCD layer.

Abstract: A backlight module includes a light guide plate, a light source disposed at a side of the light guide plate, a diffuser sheet positioned over the light guide plate but not directly contacting the light guide plate, and a light mixing space positioned between the light guide plate and the diffuser sheet so that light emitted from the light guide plate efficiently mixes in the light mixing space before entering the diffuser sheet and being emitted out of the backlight module.

Abstract: A light guide body is arranged and light emerging from the light guide body is made incident on a light guide plate. The light guide body is formed to introduce the incident light to the light guide plate in such a manner that the light incident on an end surface of the light guide plate has a specified light quantity distribution.

Abstract: When a long illuminant module is constructed, debonding of a bonded interface or bending occurs due to a difference in a magnitude of thermal deformation between a lens material and a metal substrate. In an illuminant module including light emitting elements, a substrate on which the light emitting elements are mounted, a transparent encapsulating resin which encapsulates the light emitting elements, and a lens material having cavities formed therein, in which the respective light emitting elements and transparent encapsulating resin are stored, notches are formed in a surface of the lens material on the side of the substrate, and the notch surfaces of the notches and the surface of the substrate are bonded using a bonding material.

Abstract: A backlight module includes a light guide plate, a light source disposed at a side of the light guide plate, a diffuser sheet positioned over the light guide plate but not directly contacting the light guide plate, and a light mixing space positioned between the light guide plate and the diffuser sheet so that light emitted from the light guide plate efficiently mixes in the light mixing space before entering the diffuser sheet and emitted out of the backlight module.

Abstract: A planar illumination device is provided with a plurality of light guide paths, on which scanned light in different scanning sections of a scanning range by a scanning unit is respectively incident, and an illumination unit having a plurality of emission regions for emitting the light guided by the respective light guide paths. The number of the emission regions is 2 or more and 1000 or less, and the respective emission regions successively become luminous as the scanned light is incident on the respective light guide paths.

Abstract: A unitary light guide plate includes a light exit plane, a thick portion located substantially on a center portion of the light exit plane, thin end portions formed on both sides of the thick portion, a half portion of a parallel groove formed on a backside of the light exit plane to accommodate linearly arranged light sources, inclined back portions arranged so as to become thinner from the thick portion to the thin end portions, and scattering means for scattering light entering from the light sources accommodated in the parallel groove into the thin end portions and propagated through the inclined back portions toward the thick portion. A light guide plate unit has two or more of the unitary light guide plates coupled together in such a way that respective light exit planes are arranged to form a same plane.

Abstract: A portable display device minimizes protrusions of a light emitting display panel, such as an organic light emitting display panel, and an integrated circuit to allows the thickness thereof to be reduced. The portable display device includes a light emitting display panel, such as an organic light emitting display panel. A metal plate is located on a rear surface of the organic light emitting display panel. A bottom chassis receives another light emitting display panel, such as a liquid crystal display panel and a backlight assembly. A first printed circuit board is located between the organic light emitting display panel and the bottom chassis. At least a part of either the organic light emitting display panel or the metal plate is arranged in opening portions of the bottom chassis and the first printed circuit board.

Abstract: A light guide includes a body having an elongate shape and a plurality of light-reflecting faces and light-emitting faces extending along the body. The light-reflecting faces extend in a stepped fashion along the body in the direction of a longitudinal axis of the light guide and are configured to reflect light rays by the principle of total internal reflection. Each light-emitting face is disposed along the body opposite a corresponding light-reflecting face. Each light-emitting face is configured to emit light reflected by the corresponding light-reflecting face. The light-emitting faces are also disposed on the body in a stepped fashion. Steps of the light-emitting faces correspond to steps of the light-reflecting faces. In another aspect, the light-reflecting faces are separated by stepped-down faces. The stepped-down faces are oriented at a stepped-down angle in the range of about 1 and 10 degrees with respect to the longitudinal axis of the light guide.

Abstract: A point light source is converted into a plane light source having a satisfactory uniformity. The point light source is converted into a line light source by means of a linear light guiding plate, and further into the plane light source by means of a plane-like light guiding plate. Light from the point light source is reflected at a lamp reflector to be incident on at least two side surfaces of the plane-like light guiding plate.

Abstract: A light source device having light guide elements (2a to 2f) and light emitting elements (3a to 3f) for supplying light to each of the light guide elements. The light guide elements each has a wedge-like shape whose thickness is reduced from one end to the other end. The light guide elements are tandem arranged such that the thinner end of a light guide element lies over the thicker end of the other light guide element. Each light guide element has holding sections recessed in the width direction (8a to 8f, 9a to 9f) in its thicker end on which the other light guide element lies. In the light guide device in which the wedge shaped light guide elements are tandem arranged, positional displacement between light guide elements is prevented.

Abstract: The present invention relates to a backlight unit including a bottom case including a receiving space; a plurality of divided light guide panels arranged in the receiving space in parallel; light source units arranged at one side of each of the divided light guide panels; and fixing members for preventing movement of the light guide panels by being arranged between the divided light guide panels in order to prevent the movement of the divided light guide panels.

Abstract: A backlight assembly includes an array of optical waveguides that are arranged in rows and columns. The array of optical waveguides has a planar upper surface substantially comprised of light exit facet of optical waveguides and spaced-apart lower surface substantially comprised of light input facet of optical waveguides. Backlight assembly also includes a light reflector panel that is spaced-apart from the lower surface of the array. Disposed between reflector panel and the lower light input facet of the optical waveguides are light sources. Light sources comprise light emitting diodes having 120 degree emission angles.

Abstract: A backlight module includes a light guide plate and two light emitting elements for emitting light beams. The light guide plate includes first and second light guide portions and a connecting portion interconnecting the first and second light guide portions. The first light guide portion has two opposite first light incident surfaces at opposite sides thereof, and a first light output surface. The second light guide portion has a second light incident surface facing first light output surface of the first light guide portion. Each of the light emitting elements faces one of the first light incident surfaces of the first guide portion. The first guide portion receives the light beams via the first light incident surfaces and output them via the first light output surface. The second light guide portion receives the light beams from the first light output surface via the second light incident surface.

Abstract: The invention discloses a light guide plate structure. The light guide plate structure includes a light-receiving surface, a light-emitting surface and a light-reflecting surface. The light-receiving surface receives emitting light from at least a light source, and the light propagating in the light guide plate exits through the light-emitting surface. The light-reflecting surface is opposite to the light-emitting surface for guiding the light that passes through the light-receiving surface to the light-emitting surface. The light-emitting surface and/or the light-reflecting surface include at least a composite structure. The composite structure includes a primary structure and a secondary structure where the secondary structure is disposed to a side of the primary structure.

Abstract: A backlight assembly and a display device having the backlight assembly include a plurality of light guiding plates, and at least one light source unit that illuminates the light guiding plates, wherein the light guiding plates are provided with protrusions that protrude from facing planes thereof so as to allow the adjacent light guiding plates to be separated from each other by a separation distance.

Abstract: A transparent light guide member comprising a first light guide unit in the form of a transparent plate having a rectangular light emitting plane and a parallel groove formed on a rear surface located opposite from the rectangular light emitting plane and parallel to one side of the rectangular light emitting plane; and a second light guide unit, which is transparent, having a columnar external shape to be accommodated in the parallel groove and containing light-scattering particles. Let ? be the scattering cross section of the particles, LG the length of the light guide unit 32 in the direction in which light propagates, Np the particle density, and KC a compensation coefficient, then a value ?·LG·Np·KC the light guide member assumes is not smaller than 1.1 and not greater than 8.2, and the compensation coefficient KC is not smaller than 0.005 and not greater than 0.1.

Abstract: A backlight for a color liquid crystal display apparatus includes a first light-guide plate; a first incidence part for receiving light of a first primary color in a first area on a first lateral surface of the first light-guide plate; a second incidence part for receiving light of a second primary color light in a second area on a second lateral surface that is opposite to the first lateral surface of the first light-guide plate; and a third incidence part for receiving light of a third primary color in a third area on a rear surface of the first light-guide plate. The number of superposition steps is thereby reduced, light-guide plates can easily be superposed onto an LCD panel with high accuracy, and a lightweight and inexpensive backlight for a color liquid crystal display apparatus can be obtained.