Abstract: Tunable MEMS resonators having adjustable resonance frequency and capable of handling large signals are described. In one exemplary design, a tunable MEMS resonator includes (i) a first part having a cavity and a post and (ii) a second part mated to the first part and including a movable layer located under the post. Each part may be covered with a metal layer on the surface facing the other part. The movable plate may be mechanically moved by a DC voltage to vary the resonance frequency of the MEMS resonator. The cavity may have a rectangular or circular shape and may be empty or filled with a dielectric material. The post may be positioned in the middle of the cavity. The movable plate may be attached to the second part (i) via an anchor and operated as a cantilever or (ii) via two anchors and operated as a bridge.

Abstract: A variable capacitance type capacitor includes an inside member and an outside member including a space for housing the inside member. The inside member has a columnar shape, and a first conductor pattern is formed on a circumferential surface thereof. The outside member has a predetermined dielectric constant, and a second conductor pattern is formed on an outer circumferential surface thereof so as to oppose the first conductor pattern formed on the inside member. The inside member housed in the space of the outside member is displaced relative to the outside member in a direction of a central axis of the inside member in response to an externally applied force, and an opposed area between the first conductor pattern and the second conductor pattern changes to thereby form a capacitance corresponding to the externally applied force between the first electrode and the second electrode.

Abstract: A laminated ceramic capacitor has multiple layered dielectric ceramic layers of a dielectric ceramic constituted by primary phase grains whose primary component is BaTiO3, secondary phase grains containing at least Re (Re represents at least one of Eu, Gd, Dy, Ho, Er, Yb, and Y), Ba, and Ti, and grain boundary phase containing at least one of B and Li or both; and internal electrodes which are made of Cu or Cu alloy. When a thickness of the dielectric ceramic layer is given by t, and when grain sizes at cumulative 20%, cumulative 50%, and cumulative 95% points of a cumulative count distribution of the primary phase grains are given by D20, D50, and D95, respectively, D20?D50×70%, D50?t/4, D95?t/2, and CV value ((standard deviation between D20 and D95)/D50)<40% are satisfied.

Abstract: A metallized film capacitor includes a dielectric film and two metal vapor-deposition electrodes facing each other across the dielectric film. At least one of the metal vapor-deposition electrodes is made of substantially only aluminum and magnesium. This metallized film capacitor has superior leak current characteristics and moisture resistant performances, and can be used for forming a case mold type capacitor with a small size.

Abstract: There is provided a capacitor including a dielectric layer having a first plane, a second plane opposite to the first plane, and a plurality of through-holes communicated with the first plane and the second plane; a first external conductor layer disposed on a part of the first plane; a second external conductor layer disposed on the second plane; a third external conductor layer disposed on another part of the first plane; a first internal conductor housed in a part of a plurality of the through-holes and connected to the first external conductor layer; a second internal conductor housed in another part of a plurality of the through-holes and connected to the second external conductor layer; and a third internal conductor housed in the other part of a plurality of the through-holes and connected to the second external conductor layer and the third external conductor layer.

Abstract: There is provided a multilayer ceramic electronic component, including: a ceramic body including a dielectric layer and having first and third surfaces opposing each other in a length direction of the dielectric layer and second and fourth surfaces opposing each other in a width direction thereof; and a multilayer part including a first internal electrode and a second internal electrode disposed to oppose each other, while having the dielectric layer interposed there between in the ceramic body, and exposed to the first and third surfaces of the ceramic body, respectively; wherein one or more residual carbon removing path parts are formed to be protruded on both side of the first and second internal electrodes in a length direction of the ceramic body.

Abstract: A dielectric ceramic that contains, as its main constituent, main-phase grains including a perovskite-type compound containing Ba, Ca, and Ti; first heterogeneous-phase grains containing Ca, a rare-earth element, and Si; and second heterogeneous-phase grains containing no Ca and containing the rare-earth element and Si. The second heterogeneous-phase grains are present in the dielectric ceramic in a ratio of 0.05 or less (including 0) of the number of the second heterogeneous-phase grains to the total of the first heterogeneous-phase grains and the second heterogeneous-phase grains. In the first heterogeneous-phase grains, the content of Ca is preferably 8% or more in terms of molar ratio with respect to the total content of Ca, the rare-earth element, and Si.

Abstract: A method for producing a conductive polymer dispersion liquid includes preparing an emulsion of a polyanion adsorbed on a conductive polymer precursor monomer by emulsifying a blended liquid obtained by blending the conductive polymer precursor monomer, the polyanion, and an aqueous solvent; and forming a dispersoid of a conductive polymer by chemical oxidative polymerization with addition of an oxidant to the emulsion. Furthermore, by using this conductive polymer dispersion liquid to provide an electrolytic capacitor, the ESR of the capacitor can be reduced.

Abstract: To provide a solid electrolytic capacitor capable of high performance, the capacitor including: an anode element having a dielectric film disposed on a surface thereof; a cathode element; and a solid electrolyte interposed between the anode element and the cathode element, the solid electrolyte being a conductive polymer having a first repeat unit (A) expressed by the following formula (1) and a second repeat unit (B) expressed by the following formula (2): where L is an arbitrarily replaceable alkylene or silyl group having 2 or 3 carbon atoms; and Rx and Ry are each arbitrarily replaceable alkyl groups having a linear or branched structure and having 1 to 14 carbon atoms, each being different from the other.

Abstract: Electrical distribution systems and methods are disclosed. An example electrical distribution system includes one or more splitter connectors, each allowing one power source to be split into two or more power sources; one or more joining connectors, each allowing connection between a power source wire and a plurality of light or ceiling fan wires using only one connector; and one or more distribution units, each configured to distribute power to at least one light circuit and/or wall outlets using only one power source from a main power supply or breaker box.

Abstract: Various embodiments provide materials, parts, and methods useful for electronic devices. One embodiment includes providing a coating on at least one surface of a substrate, increasing an amorphicity of the coating, and incorporating the substrate including the coating having increased amorphicity into an electronic device. Another embodiment relates to frictionally transforming a coating from crystalline into amorphous to form a metamorphically transformed coating for an electronic device. Another embodiment relates to an electronic device part having a metamorphically transformed coating disposed on at least one surface thereof.

Abstract: Techniques or processes for providing markings on products are disclosed. In one embodiment, the products have housings and the markings are to be provided on sub-surfaces of the housings. For example, a housing for a particular product can include an outer housing surface and the markings can be provided on a sub-surface of the outer housing surface yet still be visible from the outside of the housing. Since the markings are beneath the surface of the housing, the markings are durable.

Abstract: A collapsible electronic equipment includes a first part, a hinge device, and a second part. The first part pivots on the second part via the hinge device. When the second part is inclined at an inclined angle relative to the first part, a shaft of the hinge device is moved from a first position to a second position.

Abstract: A base substrate includes a substrate and metal layers (a metalized layer and an electrode layer) provided on the substrate. Each metal layer includes at least a nickel-containing film which contains nickel as a material and a palladium-containing film which is located on an opposite side to the substrate with respect to the nickel-containing film and contains palladium as a material, and at least one of the nickel-containing film and the palladium-containing film contains phosphorus at a content of less than 1% by mass.

Abstract: A wire fixing mechanism is provided for fixing a wire to an electronic device. The wire fixing mechanism includes a mechanism body, a wire restriction portion and a fixing portion. The wire restriction portion is connected to the mechanism body, wherein, the wire restriction portion restricts the wire. The fixing portion is connected to the mechanism body, wherein the fixing portion is adapted to be fixed to the electronic device.

Abstract: The portable apparatus comprises a first casing 1 and a second casing 2 slidably connected to each other by a connecting member. The connecting member and one of the casings 2 have opposed surfaces formed with a sliding-contact surface 311 and a sliding-contact receiving surface 211, to slide against each other in a process of shifting from a second opened state to a closed state, to thereby displace from a position in a sliding direction relative to the connecting member in the second opened state to a predetermined relative position in the closed state.

Abstract: A flexible cable may include a data signal layer; a first disconnection detecting signal layer covering a front face of the data signal layer and formed with a disconnection detecting signal pattern; and a second disconnection detecting signal layer covering a rear face of the data signal layer and formed with a disconnection detecting signal pattern. The flexible cable may be formed in a multilayer structure. A shield pattern may be formed in the first and/or second disconnection detecting signal layer and avoiding the disconnection detecting signal pattern. The data signal pattern may be formed so as to be covered by the disconnection detecting signal pattern. At least a part of the signal pattern may be formed so as to avoid the disconnection detecting signal pattern.

Abstract: There is provided an input/output apparatus. Among information terminals of an input/output connector provided in an information terminal device, at least one information terminal of information terminals to switch an internal operation of the information terminal device is used also as an antenna input terminal.

Abstract: A display cover to housing interface system includes a display screen fronted by a display cover having front and obverse faces and a distal edge between the faces around a circumference thereof (i.e., edge thickness), and also an outer housing that provides support for the display cover. A portion of the display cover distal edge or thickness is fully exposed to outside, such that the display cover is exposed and substantially visible when viewed directly from the front and at least one side while installed. The display cover can be glass, while the housing is metal. A protective layer located between the housing and display cover protects the display cover from the housing. Various support components hold the display cover in place, and can include magnets and/or a stabilizer assembly affixed along a bottom edge of the display cover and adapted to couple to a bottom chin of the housing.

Abstract: A laptop personal computer (PC) is disclosed. The laptop PC includes a hinge unit that turns around a vertical axis and rotates around a horizontal axis, and the hinge unit connects a main body chassis to a display chassis. The hinge unit includes an inside, through which cables connecting a main body and a display pass. A path is provided, along which the cables are installed, and the path includes a part that is parallel to the vertical axis and is apart from the vertical axis and having a part overlapping with the horizontal axis towards the vertical axis. The cover is provided at the display chassis for covering the cables overlapping with the horizontal axis. This can eliminate the necessity of a cover for the cables on the side of the hinge unit, thus making the laptop PC thinner.

Abstract: An apparatus and method is provided for conveying heat away from an electronic component. In one embodiment, a method positions a conformable thermal interface element in heat conducting contact with an electronic component. A heat conducting member is disposed within the conformable thermal interface element. The heat conducting member is coupled with a manifold so that the heat conducting member is in heat conducting contact with the manifold. The electronic component may be installed or removed without disassembly of the apparatus.

Abstract: An electronic apparatus includes a first chamber in which a heat generator is arranged and a second chamber separated with a partition from the first chamber. The electronic apparatus is provided with a first cabinet having the partition and an isolation wall that encloses to seal the first chamber, a second cabinet enclosing the second chamber and having an intake port and an exhaust port, a thermoconductive member arranged in the first chamber and connected thermally to the heat generator and to the partition, a heat collecting-radiating member arranged in the second chamber and connected thermally to the partition, and an air blower arranged in the second chamber so as to circulate the air in the second chamber.

Abstract: A cooling device includes a heat sink base plate for mounting on a circuit board to absorb waste heat from a heat source, a radiation fin unit consisting of a set of radiation fins, mounted on the heat sink base plate opposite to the circuit board and defining a plurality of heat-dissipation passages between each two adjacent ones of the radiation fins, a cooling fan unit mounted on the radiation fin unit for creating currents of air toward the heat-dissipation passages, a plurality of thermal tubes supported on the heat sink base plate and fastened to the radiation fins. Each radiation fin has first wind guiding wall portions and second wind guiding wall portions respectively tilted in reversed directions to facilitate the flow of air through the heat-dissipation passages.

Abstract: Heat is conducted from a primary component to a thermal dissipation structure. An airflow removes from the thermal dissipation structure. An air channel associated with the thermal dissipation structure diverts a portion of the airflow to a secondary component, thereby providing cooling to the secondary component.

Abstract: Provided is an electronic component box for a vehicle. The electronic component box for a vehicle, the electronic component box including a housing formed of a plastic material and manufactured through plastic injection molding, the housing having an opened top surface, a top cover formed of a plastic material and manufactured through the plastic injection molding, the top cover covering the opened top surface of the housing, a base cover seated on a bottom surface of the housing, an electronic component set seated on a top surface of the base cover, and an inner cover accommodated within the housing, the inner cover covering the electronic component set to shield an electromagnetic wave emitted from the electronic component set.

Abstract: A apparatus and a method for heat transfer is provided. The apparatus include a device and a mechanism for transferring heat to or from the device that includes a heat transfer fluid comprising a fluorinated oxirane. The fluorinated oxirane can contain substantially no hydrogen atoms bonded to carbon atoms and can have from about 4 to about 18 carbon atoms.

Abstract: An electronic device is provided that includes a base having a first side and a second side, and a lid having a first side and a second side. A hinge device may couple to the base and the lid, and may allow the lid to move relative to the base between the closed state and the opened state. A heat exchange device may be adjacent to the hinge device in an area between the base and the lid. The heat exchange device may receive heat from a component in the base.

Abstract: The present disclosure provides a heat emission/radiation device for a junction box printed circuit board (PCB), which allows a next-generation intelligent junction box PCB to be manufactured in a dual-layer structure that maximizes heat emission effects. In other words, the present invention provides a heat emission device for a junction box PCB, in which a PCB having an IPS semiconductor device mounted thereon is mounted as a dual-layer structure by folding, such that the PCB may be easily installed in a small space of a vehicle, and a heat absorption and emission path for effectively emitting heat generated by the PCB mounted as the dual-layer structure is formed.

Abstract: Provided is an electronic component box for a vehicle. The electronic component box for a vehicle, the electronic component box including a housing formed of a plastic material and manufactured through plastic injection molding, the housing having an opened top surface, a top cover formed of a plastic material and manufactured through the plastic injection molding, the top cover covering the opened top surface of the housing, a base cover seated on a bottom surface of the housing, an electronic component set seated on a top surface of the base cover, and a plated layer disposed on an inner circumferential surface of the housing and a back surface of the top cover to shield an electromagnetic wave.

Abstract: The instant disclosure relates to a planar heat dissipation structure, which comprises a first electrically insulating and thermally conductive layer having a thermal conductivity coefficient greater than 0.5 W/mK and a metal layer chemically bonded to and in thermal contact with the first electrically insulating and thermally conductive layer. The planar heat dissipation structure forms a one-piece structure that is configurable from a substantially planar collapsed state to a folded three-dimensional state, and defines a base portion and at least one flap portion configured to be foldable with respect to the base portion thereon, such that the first electrically insulating and thermally conductive layer constitutes an inner surface of the planar heat dissipation structure to define a covering space. The instant disclosure also discloses an electronic device that utilizes said foldable planar heat dissipation structure.

Abstract: A server cabinet includes a rack, two slide rails, a server, and two brackets. Two first posts are formed at a front end of the rack, and two second posts are formed at a rear end of the rack. Each slide rail is fastened between the corresponding first post and second post. The server is connected between the slide rails and includes two opposite side plates. Each side plate and the corresponding slide rail bound a channel. Electronic components are mounted in a front end of the server. The brackets are fastened to the server and respectively fastened to front ends of the slide rails. A number of first through holes are defined in one of the brackets, aligning with the corresponding channel. A number of second through holes are defined in the side plate near the first through holes, behind the electronic components.

Abstract: A server equipped with touch display module is illustrated. The server is placed in a rack enclosure and includes a rack, an information gathering unit, a rack connecting unit, and the touch display module. The rack includes a receiving slot in front side of the rack. The information gathering unit is coupled with a plurality of system components of the server and used for gathering operation information of the system components. The operation information is transmitted to the touch display module through the rack connecting unit. The touch display module slidably received in the receiving slot can be drawn out for displaying operation information. The operation information includes identification data and state data of the system components. When error information associated with the system component is identified in the received operation information, the touch display module drawn out displays an alert message related to the failed system component.

Abstract: A communication device having multi-module assembly is provided. The communication device includes a body, a first communication module and a second communication module. The body has a front side, a rear side and a plurality of lateral sides. The front side and the rear side both have a length dimension and a width dimension, and the lateral sides have a thickness dimension. The body is a combination of a plurality of housings with the same length dimension and the same width dimension, and the rear side of a housing ahead is connected with the front side of another housing behind. The first communication module is disposed in a first housing of the body. The second communication module is disposed in a second housing of the body.

Abstract: An electronic device includes a housing and a chip card holding mechanism mounted on the housing. The housing defines an insert opening. The chip card holding mechanism includes a tray received in the insert opening, a transferring assembly and a driving assembly mounted on the housing. The tray comprises base body and an operating portion located at an end of the base body. The operating portion includes a resisting surface. The transferring assembly includes a rotating member and a positioning shaft. The positioning shaft is positioned on the housing. The rotating member is rotatably sleeved on the positioning shaft. The rotating member includes a transferring end and a resisting end. The driving assembly resists the transferring end, and the resisting end resists the resisting surface of the operating portion of the tray.

Abstract: A converter assembly, a method for producing a converter assembly and a method for operating a converter assembly are described, in which a base module includes power electronics and control electronics. The base module includes a housing, particularly a housing part at least partially forming a housing for the power electronics and control electronics. The base module includes an electrical and mechanical interface, via which signal electronics are able to be joined to the base module with form-locking and/or force-locking, in order to form the converter assembly. The signal electronics include a housing, especially so that after being joined, the housing of the signal electronics and the housing of the base module together form a housing of the converter assembly. A setpoint value for speed and/or torque is transmittable electrically via the interface, the signal electronics having means for receiving, determining and/or inputting the setpoint value.

Abstract: A liquid crystal display (LCD) device includes a backplane, a PCB fixed to the backplane, and a fixing piece used for fixing the PCB. The fixing piece includes a main trunk, and limit parts arranged at two ends of the main trunk. The limit parts are made of insulating material. In the present disclosure, because the limit parts arranged at the two ends of the fixing piece for fixing the PCB are made of insulating material, a domain of the PCB covered by the limit parts can still be wired by only bypassing the fixing hole. Meanwhile, the limit parts made of insulating material are not required to be laid with copper near a fixing hole, and an area of the PCB is reduced.

Abstract: An interposer substrate of the invention includes: a single substrate having a first main surface and a second main surface; a plurality of through-hole interconnections having at least a first portion formed so as to extend in a direction different from the thickness direction of the substrate, a second portion constituting one of end portions of a through-hole interconnection, and a third portion constituting the other of the end portions of the through-hole interconnection, the through-hole interconnections being provided inside the substrate so as to connect the first main surface to the second main surface, wherein the second portion is substantially perpendicular to the first main surface and is exposed to the first main surface, the third portion is substantially perpendicular to the second main surface and is exposed to the second main surface, and lengths of the through-hole interconnections are the same as each other.

Abstract: A wiring substrate includes an insulating layer, an upper wiring pattern, and a lower wiring pattern, the wiring patterns sandwiching the insulating layer. The lower wiring pattern includes an interlayer connecting conductor integral therewith and projecting toward the upper wiring pattern for electrical connection to the upper wiring pattern. The interlayer connecting conductor is joined to the upper wiring pattern so as to penetrate into the upper wiring pattern beyond a joining interface between the insulating layer and the upper wiring pattern. Thus, the wiring substrate adaptable for a large current is provided without causing degradation of reliability in connection, which may occur by cracking, disconnection, interlayer peeling-off, etc.

Abstract: A holder for a portable device includes: a main body having the portable device received on a front surface portion thereof; a first switch formed at a designated position of the front surface portion of the main body so as to be push into and protruded from the front surface portion; first and second arms formed at both side surfaces of the main body, and having a distance provided therebetween and varied by the first switch such that the portable device is attached or detached; and a second switch including a first button formed to be physically connected to the first arm inside the main body and a second button formed to be physically connected to the second arm inside the main body, and varying the distance between the first and second arms.

Abstract: A simulated sunlight irradiation apparatus (100) has transmittance adjustment members (13a and 13b) provided above an irradiation surface of a light guide plate (10) and in the vicinity of either incident face of the light guide plate (10) on which simulated sunlight is incident. The transmittance adjustment members (13a and 13b) adjust the transmittance of light in a portion of a wavelength band of simulated sunlight that is emitted from the irradiation surface of the light guide plate (10), thus bringing about improvement in spectral coincidence of the simulated sunlight. This provides a simulated sunlight irradiation apparatus that can radiate simulated sunlight with high spectral coincidence.

Abstract: An optically active structure (100) is provided, comprising at least two different groups (G1, G2) of optically active nanorods (104A, 104B). The groups of nanorods differ from one another in at least one of wavelength and polarization of light emitted thereby in response to pumping light. The nanorods of the same group are homogeneously aligned with a certain axis of alignment being substantially parallel or substantially perpendicular to an axis of alignment of the nanorods of at least one other group, such that the nanorods of said at least two groups have one or two axes of alignment. The optically active structure is used as colour polarized light source for displays.

Abstract: A backlight module and a keyboard using the same are provided. The keyboard includes a keycap layer and a backlight module. The keycap layer has a plurality of key structures. The backlight module includes a light guide layer and a reflective layer. The light guide layer having a light-incident side is disposed under the keycap layer, wherein the light-incident side has a plurality of openings. The reflective layer is disposed under the light guide layer. The reflective layer has a reflective surface, a plurality of wires and a plurality of light sources. The wires and the light sources are located on the reflective surface, and the light sources respectively pass through the openings and are located at the light-incident side.

Abstract: A touch key control and icon display apparatus comprises a first substrate, a light-emitting element, a second substrate, and a body portion. The light-emitting element is disposed adjacent to the first substrate. The second substrate comprises a circuit layer configured to sense a touch. The body portion is disposed between the first and second substrates and comprises a reflective surface that defines a chamber. The chamber is formed through the body portion and configured to receive the light-emitting element. The circuit layer comprises an icon disposed adjacent to an opening of the chamber. A portion of light, from the light-emitting element, incident on the circuit layer can pass through the circuit layer, and another portion of the light can be reflected by the circuit layer.

Abstract: A fluorescent substrate includes a substrate, a fluorescent layer disposed on the substrate, the fluorescent layer emitting fluorescence owing to excitation light passing through an incident surface of the fluorescent layer facing the substrate and emitting the fluorescence through an exit surface of the fluorescent layer facing the incident surface, and reflective portions, which face the incident surface and side surfaces of the fluorescent layer in contact with the incident surface. The reflective portions include a first reflective portion that reflects the excitation light and the fluorescence and a second reflective portion disposed on at least part of the incident surface, the second reflective portion allowing at least light having a peak wavelength of the excitation light to pass through and reflecting at least light having a peak wavelength of the fluorescence.

Abstract: An illuminated cooler including: a base receptacle; a lid; a series of lights in the interior of the base receptacle; and a solar panel across a top surface of the lid. The series of lights may be place along a top perimeter of an interior of the base receptacle and placed on a lighting track. The series of lights may be placed on at least one side of an interior of the base receptacle. In one particular embodiment, the base receptacle includes a battery as an alternative power source.

Abstract: The present invention provides connecting element, which includes mold frame and back plate; side of back plate disposed with convex bump unit having a bottom surface, side of mold frame disposed with opening having elastic latch unit inside, latch unit having latch hook part with top surface; wherein bottom surface of convex bump unit contacting to push top surface of latch hook part to make latch unit and convex bump unit fitly engaged, side of top surface of latch hook part near free end of latch hook part higher than bottom surface of convex bump unit. The invention also provides backlight module and disassembly method. Through designing different latch unit and convex bump unit, the invention effectively prevents latch hook part from springing back and damages caused by repetitive flipping latch hook part during disassembly. The invention ensures easy assembly/disassembly and reduces cost.

Abstract: A backlight module includes a light source and a light scattering plate. The light scattering plate includes a light incident surface and a light output surface, the light incident surface facing the light source, and the light output surface defining a number of netted dots for scattering light. A distribution of the netted dots meets formulas of rk=akb and ?k=2???2, wherein k is an ordinal number of one netted dot, rk is a distance between the k netted dot and the a center of the light source, and ?k is an angle of the k netted dot relative to a center of the light source, a>0, b>0 and ? = 1 + 5 2 .

Abstract: A display device includes: a display of which a display surface is displayed with an image; plural light sources which output light toward the display, and configure a backlight; a diffuser plate arranged between the display and the plural light sources, and diffuses light output from the light source; and a support pin arranged on the opposite side to the display by interposing the diffuser plate therebetween, and holds the diffuser plate by being in contact with the diffuser plate. A plate shaped unit formed in a transparent plate shape is provided at a portion located on the diffuser plate side in the support pin, the plural light sources and the support pin are arranged in line in a direction orthogonal to a direction in which the display and the diffuser plate are aligned, and the plate shaped unit is caused to face the light source in the shortest distance.

Abstract: A recessed portion is formed in a side face of a display device. An elastic body is provided in a recessed portion. The elastic body is elastically deformed to fix the display device to a housing when the display device is mounted in a predetermined-shaped space of the housing.

Abstract: There is provided a backlight unit. The backlight unit is configured to include: a plurality of light sources; a plurality of light guide plates being arranged alternately with the light sources so that light emitted from the light sources is incident; and a chassis receiving the light sources and the light guide plates, wherein the plurality of light guide plates are disposed to be spaced apart from each other, being symmetrical to each other in order to face the central region of the chassis, a pair of light guide plates opposed to each other on the central region being connected to each other so that the light therefrom is mixed.