Abstract: Disclosed is a display device. The display device includes a liquid crystal panel, a backlight unit configured to include a light source that supplies light to the liquid crystal panel, and an optical member adhered to the liquid crystal panel. The optical member is formed to extend in an outer direction of the liquid crystal panel, and surrounds at least one of an outside of the liquid crystal panel and an outside of the backlight unit.

Abstract: A panel display device is provided, which includes: a transparent back panel having a first surface and a second surface, where the first surface is adapted for reflecting incident lights from the outside, and the second surface is adapted for transmitting lights from the outside; a backlight source, disposed at one side of the second surface of the transparent back panel, which is adapted for emitting lights to the transparent back panel; a polarized grating, disposed at one side of the first surface of the transparent back panel, which includes a plurality of grating strips with gaps formed between neighbouring grating strips, where the polarized grating enables the incident lights from the transparent back panel to be polarized and then pass through the gaps; a semiconductor switch array; and a transmission light valve array. The panel display device of the disclosure increase the utilization efficiency of lights.

Abstract: A display system, having an emissive body, emitting light over a complete surface as part of a display system. The emissive body can be a FIPEL type device with a first transparent conductive coating over a light emitting substrate. A transparent substrate, has first and second surfaces, with the first surface coupled to the first transparent conductive coating, and the second surface of said transparent substrate including a surface formed with plural light channeling structures thereon.

Abstract: A method and system for zonal switching for light steering to produce an image having high dynamic range is described. The system comprises: a light source for providing light along an optical path; a spatial light modulator for directing portions of the light to off-state and on-state light paths, thereby producing an image, the spatial light modulator having a plurality of illumination zones corresponding to the image; and a set of sequentially-arranged optical elements in the optical path for steering at least some of the light from a first subset of the plurality of illumination zones to a second subset of the plurality of illumination zones to increase the dynamic range of the image. The dwell time of the one or more sequentially arranged optical elements can be modified to steer light.

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: The present inventions enables reduction of outside dimensions of a small-size liquid crystal display device for a mobile phone and also elimination of an inclination of an image display area. A liquid crystal display panel 1 is mounted on a mold 6 made of resin. Because the mold 6 has not a wall surrounding the liquid crystal display panel 1, outside dimensions of the frame 7 can be made smaller. When the mold 6 with the liquid crystal display panel 1 mounted thereof is set in the frame 7, the mold 6 elastically deforms, and an inclination of a display area 31 of the liquid crystal display panel 1 is corrected by projections 62 formed on the mold 6.

Abstract: Disclosed is a transparent display device including a light guide plate formed with a plurality of concave patterns at the lower surface thereof to totally reflect polarized light entered in a lateral direction while transmitting natural light entered from a lower direction therethrough; a light source disposed in a lateral direction of the light guide plate to emit visible light including first and second polarized lights; a first polarizing plate disposed at a lateral portion of the light guide plate to transmit either one of the first and second polarized lights through the light guide plate; a liquid crystal panel for driving liquid crystals to change the phase of the polarized light; and a second polarizing plate for controlling an amount of the polarized light according to the changed phase of the polarized light.

Abstract: A backlight assembly includes a waveguide plate guiding light, a first light-emitting module disposed on a first side of the waveguide plate, the first light-emitting module including a plurality of first light-emitting blocks, a second light-emitting module disposed on a second side of the waveguide plate, the second light-emitting module including a plurality of second light-emitting blocks, and a plurality of optical drivers controlling luminance levels of the first light-emitting blocks and the second light-emitting blocks, wherein at least one of the first light-emitting blocks, at least one of the second light-emitting blocks, and at least one of the optical drivers are connected to each other.

Abstract: Disclosed is a display apparatus capable of preventing external light from being excessively reflected and increasing the reflection efficiency of internal light, thereby improving visibility of the display apparatus. The display apparatus includes a display panel, which displays an image, and a front-light unit including an internal light source, a light guide plate to guide the internal light emitted from the internal light source to the display panel, and an optical member provided at an upper portion of the light guide plate. The display apparatus also includes a display panel, an internal light source emitting internal light, an optical member preventing external light from being reflected, and a substrate with the optical member.

Abstract: Provided is a liquid crystal display device including: a main display region (27) and a sub display region (28a, 28b) for emitting lights of respective different brightness levels; and a liquid crystal display panel (22) having a display surface (24) provided which a light guide body (70). The light guide body (70) is a transparent optical member, and has a part covering at least a boundary line (26) between the main display region (27) and the sub display region (28a, 28b), when seen in a plan view. Further, the part of the light guide body (70) covering the boundary line (26) is formed to have a cross section having a curvature.

Abstract: LED backlight driver, LED backlight module, and liquid crystal display are disclosed. The LED backlight driver comprises DC voltage input end, boost circuit, LED string, and constant current driver. The DC voltage input end is used for inputting a DC voltage. The boost circuit is used for boosting the DC voltage input from the DC voltage input end and outputting a boosted DC voltage. The LED string comprises a plurality of LEDs connected in series and a first resistor. The LED string receives the boosted DC voltage from the boost circuit. A sum of forward voltages of all of the LEDs in the LED string is less than or equal to the boosted DC voltage output from the boost circuit. The constant current driver is used for outputting a level signal to the boost circuit based on a voltage across the first resistor and a voltage for a triangular signal.

Abstract: A display apparatus includes at least a light source, a display element, and an isotropic diffusion layer.

Abstract: A display device including a sub-backlight unit which can prevent the obscure sights caused by light from the light source of the sub-backlight unit arriving on an article or reel of the main display screen and then reflecting in the frontal direction is provided. The sub-backlight unit includes a second light guide panel having an opening part formed therein corresponding to a transparent window, a second light source disposed around the second light guide panel, and a polymer dispersed liquid crystal (PDLC) sheet disposed close to the front side of the opening of the second light guide panel.

Abstract: An illumination optical device includes a light source, a light pipe guiding illumination light from the light source, a diffuser arranged on an emitting surface side of the light pipe. A width of the emitting surface of the light pipe in the horizontal direction is set greater than a width of an illuminated object, and a width of the emitting surface of the light pipe in the vertical direction is set smaller than a width of the illuminated object.

Abstract: A method for manufacturing an image display device includes the step of forming a cured resin layer by interposing a photo-curable resin composition between a protection member and a display-side panel including an image display unit and a frame member and then photo-curing the photo-curable resin composition, with the photo-curable resin composition being disposed across between the image display unit and the frame member. In the manufacturing method, a high-viscosity resin composition having a viscosity of 3000 mPa·s or more and 12000 mPa·s or less is used as the photo-curable resin composition. Alternatively, after a gap between the image display unit and the frame member is sealed with a sealing film, a photo-curable resin composition is interposed between the display-side panel and the protection member.

Abstract: Microstructured films comprising surface modified inorganic oxide particles and polymerizable resins are described.

Abstract: A liquid crystal display device includes a liquid crystal panel including a display region and first to fourth non-display regions surrounding the display region; a light guide plate below the liquid crystal panel; and first and second LED assemblies facing opposite sides of the light guide plate and corresponding to the first and second non-display regions, respectively, that have different first and second widths, respectively, wherein the first LED assembly includes a plurality of first LED packages arranged at a first distance, and the second LED assembly includes a plurality of second LED packages arranged at a second distance.

Abstract: A frame formed by cutting and bending a plate base is provided. The maximum thickness of the frame is T, the thickness of the plate base is t, and 1.5t?T?2.5t. The frame includes a first plate element, a second plate element, and a bending portion. The second plate element is directly contacted to the first plate element, and the first plate element is substantially parallel to the second plate element. The bending portion is connected between the first plate element and the second plate element. A backlight module using the above-mentioned frame and a liquid crystal display (LCD) module using the backlight module are also provided.

Abstract: A thin collimated backlight is provided for use in a monochrome liquid crystal display or a color liquid crystal display with color converting elements. The color converting elements are located on the opposite side of the liquid crystal panel to the backlight. The backlight is illuminated by narrow-band light sources such as single color LEDs. The backlight is formed by a lightguide, one or more conventional light controlling sheets and a polymeric filter sheet. The polymeric filter acts to: 1) reflect one polarization direction over the bandwidth of source at all angles of incidence and 2) reflect the orthogonal polarization direction over the bandwidth of the source only at high incident angles. Light in this orthogonal polarization passes through the filter when incident close to the normal to the filter sheet. Light reflected by the filter is efficiently recycled within the backlight.

Abstract: Disclosed is a display device. The display device includes a liquid crystal panel, a backlight unit configured to include a light source that supplies light to the liquid crystal panel, and a polarizing part adhered to the liquid crystal panel. The polarizing part is formed to extend in an outer direction of the liquid crystal panel, and surrounds at least one of an outside of the liquid crystal panel and an outside of the backlight unit.

Abstract: The present invention relates to a technique which makes a backlight used in a liquid crystal display device thin and light-weight. The present invention provides a liquid crystal display device which includes a display panel and a backlight arranged behind the display panel, wherein the backlight includes a film-like light guide member, a film-like light semi-transmissive member adhered to a first surface of the light guide member which faces the display panel in an opposed manner, a film-like reflective member adhered to a back surface of the light guide member opposite to the first surface, and a spot light source arranged at a position of the light guide member at which light is incident on the light guide member from the first surface or the back surface. A refractive index of the light semi-transmissive member is set smaller than a refractive index of the light guide member.

Abstract: A backlight unit and a display device including the backlight unit are provided. The backlight unit includes at least one light source unit and a light guide plate. The light source unit provides collimated light and controls light such that it is emitted in a plurality of light exit directions.

Abstract: A thin backlight system includes: a light emitting section emitting lights that have different dominant wavelengths; and a plurality of light transmitting portions, the thin backlight system deflecting the lights and then converging the lights on the plurality of light transmitting portions. The thin backlight system further includes: an imaging optical system provided to face surfaces, of the plurality of light transmitting portions, on which the lights are converged. The imaging optical system including a plurality of identical lenses arranged in a vertical and/or a horizontal direction at a pitch determined by multiplying a pitch at which the plurality of light transmitting portions are arranged in a vertical and/or a horizontal direction by the number of types of the different dominant wavelengths and being configured to converge the lights from the light emitting section on light transmitting portions to which the different dominant wavelengths of the lights correspond.

Abstract: A backlight source and a thinning method for the same are provided. The backlight source includes: a solid state light source array having a plurality of solid state light sources distributed on the base, a light transmitting unit arranged above the solid state light source array, and a plurality of light adjusting units arranged between the solid state light source array and the light transmitting unit. The plurality of the light adjusting units is arranged above the plurality of solid state light sources to reflect the shallow angle incident light from the solid state light source, thus changes the light intensity distribution of the output light through the light transmitting unit from the solid state light sources from Lambertian distribution to main sides emission.

Abstract: A liquid crystal display device includes a liquid crystal display panel, a light guide plate disposed on a lower part of the liquid crystal display panel, an LED circuit substrate disposed along at least one side of the light guide plate to accommodate an LED on a front surface thereof, and a heat transmission member having a first part that faces a lower surface of the light guide plate and a second part that is extendedly bent from the first part and faces the LED circuit substrate.

Abstract: A backlight unit is provided. The backlight unit includes: a mold frame having a predetermined receiving space formed therein; a light guide plate disposed in the receiving space of the mold frame, and having an inclined surface formed on one side of the top surface so as to be inclined toward the inner side; a light source disposed between the light guide plate and the mold frame to emit light to the light guide plate; and a flexible printed circuit board, on which the light source is mounted, and which is supported in contact with the top surface of the light guide plate, wherein a stepped portion is formed on one end of the light guide plate, including a flat adhesion surface positioned at a height lower than one end face of the light guide plate.

Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight including a diffusion medium located between lamps and a diffusion plate to diffuse light. The diffusion medium includes an external band of square type diffusion medium and a plurality of ribs formed of the diffusion medium connected to both sides of the external band of square type diffusion medium. The ribs include a plurality of first ribs which are directly located over the lamps, a plurality of second ribs which are located between the first ribs, and a third rib which connects each of the ribs to each other.

Abstract: A display device includes a display module, a light source module and a guiding optical film. The display module includes a first substrate, a second substrate and a display medium. The light source module generates directional light. The display module has a vertical electric field. The display medium is optically isotropic, and the display medium is optically anisotropic when driven by the vertical electric field. The directional light is not perpendicular to the first substrate when the directional light enters the display nodule. The directional light is not perpendicular to the second substrate when the directional light exits the display module. The guiding optical film is disposed on the second substrate and has a light incident surface and a light emitting surface. After the directional light exits the guiding optical film, emitting light is formed, and the emitting light and the light emitting surface has an included angle there between.

Abstract: A backlight unit has a light source area. The width of the light source area in a first direction is shorter than the width of a liquid crystal panel in the first direction. A plurality of LED modules (31) are arranged along the second direction perpendicular to the first direction. End lenses (41A, 41B) and a middle lens (42) for enlarging a light divergence angle are disposed on the plurality of LED modules (31). The direction in which the end lens (41A, 41B) enlarges the light divergence angle differs from that in which the middle lens (42) enlarges the divergence angle. This structure can reduce difference in brightness of the liquid crystal panel, while reducing the number of light sources.

Abstract: In order to fix lenses of light emitting diodes stably without impairing heat dissipation performance in a liquid crystal display device, the liquid crystal display device includes: a liquid crystal panel; and a light emitting diode substrate (7), which is disposed on a rear surface side of the liquid crystal panel and includes: a plurality of light emitting diode elements (22) disposed along a longitudinal direction; lenses (20) each including a plurality of legs (21), the lenses being disposed on the liquid crystal panel side of the light emitting diode elements (22); and electrodes (23) which are formed on a surface of the light emitting diode substrate (7) and are electrically connected to the light emitting diode elements (22), and all the legs (21) for fixing the lenses (20) to the light emitting diode substrate (7) are disposed directly above the electrodes (23).

Abstract: A backlight that includes an illumination device that has at least one light source, a circular-mode reflective polarizer, and a specular partial reflector is disclosed. The specular partial reflector is disposed between the illumination device and the circular-mode reflective polarizer. Furthermore, the specular partial reflector is in substantially direct polarization communication with the circular-mode reflective polarizer.

Abstract: This invention relates to a backlight unit that is adaptive for reducing light loss caused by an intermediate light guide panel and reducing sag of the intermediate light guide panel. A backlight unit may include a bottom cover where a reflection plate is formed, a plurality of light emitting diodes installed inside the bottom cover, a plurality of intermediate light guide panels installed on the light emitting diodes and separated from each other, a diffusion plate for diffusing the light from the intermediate light guide panels and the reflection plate, and a plurality of optical sheets placed on the diffusion plate.

Abstract: A light source section provided in a backlight unit has a smaller width in a direction perpendicular to a length direction of the light source section than a width in the same direction of the liquid crystal panel. A plurality of LED modules are arranged along the length direction of the light source section. The LED modules are respectively assigned to areas of the liquid crystal panel, which are extended in the width direction of the light source section. Lenses are respectively disposed over the LED modules and expand light toward the areas. A control device controls each of the plurality of light sources separately or each of groups into which the plurality of light sources are divided, separately. Accordingly, it is possible to improve a contrast of a display screen, while reducing the number of light sources.

Abstract: A display device includes a display component, a light source, a rear side support member, and a reflective sheet. The light source is disposed on a rear side of the display device relative to the display component. The reflective sheet includes a bottom face part, a first side face part and a second side face part. The first and second side face parts have first and second protrusions at adjacent end edge portions of the first and second side face parts, respectively. The first protrusion overlaps with the end edge portion of the second side face part from the rear side while the reflective sheet is attached to the rear side support member. The second protrusion overlaps with the end edge portion of the first side face part from the rear side while the reflective sheet is attached to the rear side support member.

Abstract: A dual display module including a transmissive display panel, at least one transparent light guide device, and at least one light source is provided. The transmissive display panel has a first display surface and a second display surface opposite to the first display surface. The first display surface is disposed between the transparent light guide device and the second display surface. The light source is disposed beside the transparent light guide device and is capable of emitting a light beam. The transparent light guide device guides the light beam to enter the transmissive display panel through the first display surface. After the light beam entered the transmissive display panel, the light beam exits the transmissive display panel from the second display surface. A method for enhancing display brightness is also provided.

Abstract: A display device includes a display component, a light source, a rear side support member, and a reflective sheet. The light source is disposed on a rear side of the display device relative to the display component. The reflective sheet includes a bottom face part, a first side face part and a second side face part. The bottom face part is disposed on a front side of the display device relative to the rear side support member. The first and second side face parts are arranged relative to the bottom face part corresponding to adjacent side edges of the bottom face part, respectively. One of the first and second side face parts includes first and second portions with adjacent end sections, respectively. The adjacent end sections overlap with respect to each other while the reflective sheet is attached to the rear side support member.

Abstract: An optical sheet having both of an excellent light condensing function and an excellent scratch resistance is provided. An optical sheet includes: a sheet-like main body; at least three or more first unit shaped elements arranged on one surface of the main body; and second unit shaped elements arranged on the one surface of the main body. Each of the second unit shaped elements extend in parallel with in one direction on a sheet surface of the main body. A height H1 of each of the first unit shaped elements from the one surface is higher than a height H2 of each of the second unit shaped elements. A rate of an area occupied by the first unit shaped elements on the one surface is not more than 10.0%, when observed along a normal direction nd relative to the one surface.

Abstract: A light guide plate includes a body portion, and a plurality of unit shaped elements defining a light exit surface and arranged on one-side surface of the body portion side by side in an arrangement direction intersecting a light guide direction. Each unit shaped element extends in a direction intersecting the arrangement direction. A light exit surface angle ?a, which is the angle of the contour of each unit shaped element with respect to the one-side surface, is more than 10° and not more than 30° in a zone of the contour of each unit shaped element, the width of the zone along the arrangement direction being not less than 35% and not more than 70% of the full width of the unit shaped element.

Abstract: The present invention provides a package box of liquid crystal glass, which includes a box body, a plurality of mounting sections arranged in the box body, and cushioning devices mounted to the mounting sections. The cushioning devices each include a cushioning section, a retention section connected to the cushioning section, and a projection. The mounting sections each include a first receiving channel and a through hole respectively corresponding to the retention section and the projection of the respective cushioning device. The retention sections are respectively received in the first receiving channels and the projections are respectively fit into the through hole so as to fix the cushioning devices inside the box body. The package box uses cushioning devices that are mounted inside a box in a snap-fitting manner so that the operation of assembling and disassembling the cushioning devices is simple, making it easy to re-work.

Abstract: The present invention provides a liquid crystal display device, comprising: a light source, a light guide plate having a light-exiting surface, a substrate having a first surface and a second surface opposite to the first surface, a display area of the second surface comprising a pixel area and at least one non-pixel area, and a gap provided between the light-exiting surface of the light guide plate and the first surface of the substrate, wherein, at least one slot is provided on the light-exiting surface of the light guide plate; a part of the light generated by the light source and entering the light-exiting surface of the light guide plate, after being refracted by the slot and the gap sequentially, is refracted by the first surface of the substrate into the substrate, and then enters the pixel area. According to the present invention, it is able to change the light transmission path, thereby to effectively reduce the light entering a non-pixel area.

Abstract: Disclosed is an LCD device with reduced thickness and bezel width. The LCD device includes a liquid crystal display panel configured to include an upper substrate and a lower substrate that are facing-coupled to each other, a backlight unit configured to include a light guide plate which irradiates light incident from a light source module on the liquid crystal display panel and an optical sheet disposed on the light guide plate, and a coupling member configured to couple the liquid crystal display panel to the light guide plate with the optical sheet therebetween such that a sealed space is provided between the liquid crystal display panel and the light guide plate.

Abstract: A display device and a backlight module are provided in the present invention. The display device includes the backlight module and a liquid crystal display panel. The backlight module, which is used to provide a backlight source for the liquid crystal display panel, includes a luminant device and a micro-lens array. The luminant device is disposed under the liquid crystal display panel, and the luminant device has a plurality of first luminant regions and a plurality of second luminant regions. The micro-lens array is disposed between the luminant device and the liquid crystal display panel. The micro-lens array includes a plurality of micro-lenses, and each of the micro-lenses overlaps at least one first luminant region and at least one second luminant region in a direction perpendicular to the liquid crystal display panel.

Abstract: A display apparatus comprising a display panel, a light module and a haze element is provided. The light module comprises a light guide plate, a plurality of light guide elements and a first light emitting unit. The light guide plate comprises at least a light-entering surface and two opposite side surfaces. The light guide elements are disposed on at least one of the two side surfaces. The first light emitting unit is disposed on the light-entering surface. The haze element, disposed on the upper surface or the lower surface of the display panel, has a haze ranging between 1% and 10%. After the light emitted from the first light emitting unit enters the light guide plate, the light with the bright state being staggered with the dark state is guided from one of the side surfaces of the light-guiding plate.

Abstract: A gaming machine includes: a liquid crystal panel; a backlight unit which is disposed behind the liquid crystal panel; and one or more reels which are disposed behind the backlight unit and on which a plurality of symbols are displayed. The backlight unit includes: a light switch plate which is formed such that a predetermined area corresponding to a symbol selection area where selected symbols among the plurality of symbols displayed on the reel can be selectively turned to be transparent or nontransparent using a polymer dispersed liquid crystal; a half mirror which is disposed behind the light switch plate; a first light source which is disposed in front of the half mirror and emits light passing through the light switch plate and progressing forward; and a second light source which is disposed behind the half mirror and emits lights.

Abstract: The present invention discloses a backlight module which has a plurality of light-emitting diodes. The light-emitting diodes are divided into a plurality of light groups according to pitches between the adjacent light-emitting diodes. The light-emitting diodes with respect to a display-area center line have a position center, and the light group having the light-emitting diodes with larger pitches therebetween is in a position relatively close to the position center and is in a higher bright bin; the light group having the light-emitting diodes with smaller pitches therebetween is in a position relatively away from the position center and is in a lower bright bin. Therefore, luminous conditions of the overall light-emitting diodes tend to correspondence, and proportion of usage of light-emitting diodes in different bright bins can be increased.

Abstract: A projection device includes a light source, a light guiding plate, a liquid crystal device, and a projection lens. The guiding plate aligns with the light source and includes a light incident surface and a light emitting surface facing away from the light incident surface. The light incident surface faces the light source. The liquid crystal device aligns with the light emitting surface. The projection lens is positioned between the liquid crystal device and a screen.

Abstract: A projection apparatus and a location method for determining a position of a light point on a projection image of the projection apparatus are provided. The projection apparatus comprises a lens, a light detector, a light guide module and a processing circuit. The light guide module is configured to receive the light point via the lens, and to guide the light point into the light detector. The light detector outputs a detection signal to the processing circuit according to the light point within a detection period. The processing circuit determines the position of the light point on the projection image according to the detection signal.

Abstract: A liquid crystal display device includes: a light guide plate having an emission surface emitting light to a liquid crystal panel and a plurality of side surfaces; and a plurality of light sources LEDPKG inputting light to the light guide plate from at least one side surface. The light guide plate is divided into a plurality of parts extending from the light inputted one side surface to an opposite side surface and the plurality of parts include at least one first part and at least one second part. The first part and the second part are adjacent to each other, and two-dimensionally overlap with the display area, respectively. At least the second part has a shape for emitting the light from an emission surface, and a sectional shape in the extending direction of the first part is greater than that of the second part.

Abstract: A planar light source, Fresnel lens sheet, and louver are disposed in the stated order in a light source apparatus. The Fresnel lens sheet deflects and focuses in one dimension light that has entered from the planar light source. The louver is disposed in the optical path of the light emitted from the Fresnel lens sheet, and the directivity of the light can be increased by restricting the traveling direction of the light to the focal direction of the Fresnel lens sheet. The light utilization ratio can thereby be increased, the directivity of planarly emitted light can be increased, and the brightness can be made uniform at the point of observation.

Abstract: A display device includes a liquid crystal display panel that varies a phase of polarized light via liquid crystal molecules, and having first and second polarizing plates respectively disposed on opposite sides of the liquid crystal display panel; a first light guide plate including a surface having a plurality of recessed patterns, to reflect light input through a side surface of the first light guide plate, and to output two-dimensional light towards the liquid crystal display panel; and a second light guide plate including a surface having a plurality of recessed patterns, the plurality of recessed patterns of the second guide plate facing the plurality of recessed patterns of the first light guide plate.