Abstract: A diffuser is disclosed. A system comprising a light source and a diffuser is disclosed. The light source is aligned with a microlens of the diffuser in a static configuration. A method of reducing speckle with the system is also disclosed.

Abstract: A display device of the present disclosure includes: a display panel; a frame which is positioned in a rearward direction of the display panel, and to which the display panel is coupled; a substrate which is positioned between the display panel and the frame, and fixed to the frame; a plurality of light sources mounted on the substrate to form a row and a column; a reflective sheet which is positioned on the substrate, and has a plurality of holes through which each of the plurality of light sources passes; and a light pattern which is formed on the reflective sheet, and converts a color of a light provided by the plurality of light sources, wherein the reflective sheet includes: a first hole positioned adjacent to an edge of the reflective sheet; a second hole which is positioned adjacent to the first hole and positioned farther than the first hole from the edge of the reflective sheet; a first area positioned around the first hole; and a second area positioned around the second hole, wherein the light patte

Abstract: A light emitter mounting board for improving light extraction efficiency includes an insulating substrate, an electrode layer, a resin layer, a coating layer, and a reflective electrode. The resin layer is located on the electrode layer and has a through-hole portion extending in a thickness direction. The coating layer covers a surface of the resin layer and an inner peripheral surface of the through-hole portion. The coating layer includes an in-hole portion covering the inner peripheral surface and having a lateral thickness gradually increasing from the surface of the resin layer toward the electrode layer. The reflective electrode extends at least on a surface of the in-hole portion of the coating layer and on an exposed portion of a surface of the electrode layer.

Abstract: A backlight assembly is provided, comprising a backboard, one or more light sources, a diffuser plate, and one or more supporting assembly. The light sources are arranged on the backboard. The diffuser plate is arranged on the light-emitting side of the light source. The supporting assembly is arranged between the backboard and the diffuser plate. The supporting assembly comprises a supporting base and an elastic support. The supporting base connects with the backboard, one end of the elastic support is connected with the supporting base, another end of the elastic support supports the diffuser plate. The elastic support defines on a plurality of dimming grooves, the plurality of dimming grooves reflects at least a part of light emitted by the light source to the diffusion plate.

Abstract: Provided are a display panel and a display device. The display panel includes a display area, the display area includes transparent display regions, where film layers in at least two display regions of transparent display regions have different thicknesses, and/or the film layers in the at least two adjacent transparent regions are made of different materials.

Abstract: The present application discloses a backlight module and a mobile terminal. The backlight module includes a reflection layer and a light adjustment layer that are arranged oppositely, wherein he reflection layer is disposed at a periphery of each of light sources, the light adjustment layer includes first light guide portions and a second light guide portion, a light transmittance of each of the first light guide portions is lower than a light transmittance of the second light guide portion, and the reflection layer includes a diffuse reflection sub-layer at least partially overlapping with at least one of the second light guide portion, and a specular reflection sub-layer at least partially overlapping with at least one of the first light guide portions.

Abstract: The present invention discloses a backlight module and a display device adopting the backlight module. The backlight module is composed of a plurality of backlight panels spliced with each other; wherein the backlight panel includes: a plurality of first light-emitting unit arranged in the body area; and a plurality of second light-emitting units arranged in the splicing area, wherein the plurality of first light-emitting units and the plurality of second light-emitting units are arranged in a matrix, and under a same area, a brightness of the body area is lower than a brightness of the splicing area.

Abstract: The present invention relates to a lighting device (10), comprising: a plurality of first light sources (24) adapted to emit visible light (24); a light guide panel (12), wherein visible light emitted by the plurality of first light sources in operation is coupled into the light guide panel via a light incoupling part (16a); at least one second light source (28) adapted to emit at least one of UV light (28?) and violet light to be coupled into the light guide panel via a light incoupling part (16a; 16b); and an optical element (30; 30?; 30?; 42) made of a first material which is different and more UV resistant than a second material that the light guide panel is made of, wherein the optical element is adapted to distribute light emitted by the at least one second light source over an area (34; 46) which is larger than a total light output surface area (35) of the at least one second light source before the light is coupled into the light guide plate.

Abstract: A composite optical film comprises a first optical film and a second optical film disposed on the first optical film, wherein the first optical film comprises a first substrate; a plurality of reversed prisms disposed on a bottom surface of the first substrate; and a first diffusion film disposed over a top surface of the first substrate; and the second optical film comprises a first PET film thereon having a first set of prisms and a second PET film having a second set of prisms thereon, wherein the first PET film and the second PET film are laminated together.

Abstract: An optical sheet laminate 100 to be incorporated into a backlight unit 40 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted quadrangular pyramid shape, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. An arrangement direction of the recesses 22 of one of the plurality of diffusion sheets 43 closest to the prism sheets 44 and 45 intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.

Abstract: The present disclosure discloses a driving backplate, a manufacturing method thereof, and a display device. The driving backplate includes a substrate, a reflective layer disposed on a side of a substrate, and a plurality of electronic devices disposed on a side of the reflective layer away from the substrate; the reflective layer includes a plurality of openings, and includes a plurality of overlapping parts disposed adjacent to the openings and corresponding to the plurality of openings; and an orthogonal projection of each of the overlapping parts on a plane of the substrate overlaps with an orthogonal projection of a part of each of the electronic devices on the plane of the substrate.

Abstract: An electronic device comprises: a memory to store an image input; a backlight unit; a driving unit to output a driving current to the backlight unit; and a processor to identify, based on a grayscale value of the image, a first intensity of the driving current corresponding to one from among a plurality of time sections of a backlight dimming section, obtaining, based on the identified first intensity, a first control value that allows control of an intensity of the driving current, providing a second control value, which is greater than a first control value to the driving unit, that allows the driving unit to output a driving current of a second intensity that is greater than the first intensity, and provide the first control value to the driving unit that allows the driving unit to output the driving current of the first intensity during the one time section.

Abstract: The lighting device disclosed in the embodiment includes a substrate, a light emitting device disposed on a lower surface of the substrate, a reflective layer disposed to face a light emitting surface of the light emitting device, a first resin layer disposed between the substrate and the reflective layer, and a light-transmission control layer disposed on an upper surface of the substrate, wherein the light-transmission control layer may include a liquid crystal layer including a cholesteric liquid crystal, and light emitted through the light emitting surface of the light emitting device may be reflected by the reflective layer and be provided to the light-transmission control layer through the substrate.

Abstract: A hinge, a display panel, and an electronic device are disclosed. The hinge includes a fixed bracket and a supporting mechanism, wherein the supporting mechanism includes a first supporting element rotatably connected to the fixed bracket along a first shaft, a second supporting element rotatably connected to the first supporting element along a second shaft, a third supporting element rotatably connected to the fixed bracket along a third shaft, and a fourth supporting element rotatably connected to the third supporting element along a fourth shaft.

Abstract: A BLU includes a 2D array of LEDs producing light with an angular distribution of nominally ±90 degrees around a center. A transparent solid material layer is positioned with a bottom surface over the 2D array of LEDs and configured to transform the light produced by the 2D array into light having an angular distribution of nominally less than ±90 degrees around the at a top surface of the transparent solid material layer. A diffuser film is positioned over the top surface of the transparent solid material layer configured to provide a FWHM of greater than 60 degrees and configured to diffuse the light produced at the top surface of the transparent solid material layer to produce diffused light at a top surface of the diffuser film. A BEF positioned over the top surface of the diffuser film and comprising a plurality of prism microstructures, where at least some prism microstructures have an apex angle of approximately ninety degrees.

Abstract: A display module, including a plurality of pixels, includes: a first substrate; a plurality of micro pixel packages provided on an upper surface of the first substrate; and a driver integrated circuit (IC) configured to transmit a driving signal to the plurality of micro pixel packages. Each of the plurality of micro pixel packages includes a second substrate; a plurality of inorganic light emitting devices provided on an upper surface of the second substrate; and a micro pixel controller provided on a lower surface of the second substrate, the micro pixel controller being configured to control the plurality of inorganic light emitting devices.

Abstract: According to one embodiment, an illumination device includes a first light guide, a second light guide and a plurality of light sources. The first light guide includes a first main surface, a second main surface facing the first main surface, and a first side surface connected to the second light guide. The first side surface further includes a first connection surface and a second connection surface. The first connection surface extends from an end portion of the first main surface to the second main surface and obliquely extends so as to move away from the second side surface. The second connection surface perpendicularly extends from an end portion of the first connection surface to an end portion of the second main surface.

Abstract: Described are luminescent components with excellent performance and stability. The luminescent components comprise a solid material composition comprising luminescent crystals 11 from the class of perovskite crystals, embedded in a solid matrix 14 comprising a polymer P1 or Small Molecules SM1 and metal selected from Mg, Sr, Ba, Sc, Y, Zn, Cd, In, and Sb. Further described are components and devices comprising the same. Also described are methods for manufacturing such components and devices comprising such components and liquid compositions useful for such manufacturing.

Abstract: According to an embodiment of the present disclosure, a display screen, a display device, and a method for manufacturing the display screen are disclosed. The display screen includes a display panel and a light bar. The light bar includes an array substrate and a plurality of light emitting elements, and a first gap is provided between two adjacent light emitting elements. A reflecting wall is arranged in the first gap between at least two adjacent light emitting elements. By arranging the reflecting wall, the side light of the light emitting elements can be reflected upwards, thereby reducing an emission angle of the light bar.

Abstract: A display screen and a display device are provided. The display screen includes a display panel assembly, a light bar, and a reflective layer. The display panel assembly includes at least two display panels with a splicing gap between each two display panels. The light bar is attached to a display surface of the display panel assembly, covers the splicing gap, and has two opposite side surfaces extending along a length of the splicing gap. At least one side surface of the light bar is provided with the reflective layer to prevent black borders from appearing on the side surfaces of the light bar.

Abstract: Provided are a display module and a display device. The display module includes a photosensitive element, a backlight unit, and a backlight. The backlight unit includes a first reflective sheet provided with a first opening corresponding to the photosensitive element, a light guide plate including a first region corresponding to the photosensitive element and a second region adjacent thereto, and an optical film provided with a second opening corresponding to the photosensitive element. A plurality of the microstructures are provided on a side of the light guide plate facing the photosensitive element. A distance between two adjacent columns of the microstructures in the first region is less than a distance between the two adjacent columns of the microstructures in the second region, or in a column of the microstructures, sizes of the microstructures in the first region are greater than sizes of the microstructures in the second region.

Abstract: The lighting device disclosed in the embodiment includes a substrate, a light emitting device disposed on a lower surface of the substrate, a reflective layer disposed to face a light emitting surface of the light emitting device, a first resin layer disposed between the substrate and the reflective layer, and a light-transmission control layer disposed on an upper surface of the substrate, wherein the light-transmission control layer may include a liquid crystal layer including a cholesteric liquid crystal, and light emitted through the light emitting surface of the light emitting device may be reflected by the reflective layer and be provided to the light-transmission control layer through the substrate.

Abstract: A foldable display device includes a first casing and a second casing supporting a first area and a second area of a display panel, respectively, a support disposed between the first casing and the second casing, supporting the display panel based on the folding direction of the foldable display device, and including a support body which ascends toward the display panel during the out-folding operation, and descends toward a bottom face of the hinge cover during the in-folding operation.

Abstract: A component for dissipating heat of a device, a backlight module, and a display panel are disclosed. The component for dissipating heat of the device includes a first elastic body and a heat dissipation apparatus, and a first temperature threshold is set. The component for dissipating heat of the device dissipates heat of the device and ensures heat insulation of the device by a physical method, and does not include a sensor or a logic circuit. Therefore, it has low cost and eco-friendly applications, and does not consume electrical power.

Abstract: Provided is a LED light board including a substrate, a plurality of LEDs, and a colloid layer. The substrate has a plurality of adjacent light emission areas. These LEDs are respectively disposed on these light emission areas. The colloid layer is disposed on these light emission areas. These LEDs are disposed between the substrate and the colloid layer, and are covered by the colloid layer. The colloid layer has a plurality of recesses on each light emission area, and these recesses expose an upper surface of the substrate corresponding to these recesses. At least a portion of the recesses on each light emission area are disposed around the corresponding LED.

Abstract: A reflective sheet comprises a plurality of perforations for extending a plurality of light-emitting elements therein, the reflective sheet further comprises a central line passing through its center, at least one first dimming area, and at least one second dimming area, and the distance between the at least one first dimming area and the central line is smaller than the distance between the at least one second dimming area and the central line. The light-emitting elements are distributed in the at least one first dimming area and the at least one second dimming area, the at least one first dimming area has a first dimming means, the at least one second dimming area has a second dimming means, the dimension of the first dimming means is different from the dimension of the second dimming means.

Abstract: An illumination device includes a plurality of light sources arranged in at least a first group of light sources having one or more light sources and a second group of light sources having one or more light sources and further includes one or more light collectors, each being arranged for collecting light from one or more light sources from the first group of light sources and for converting the collected light into one or more light beams. The first and second groups of light sources are each individually controllable. The first and second groups of light sources are both arranged for emitting light from a space on one side of the one or more light collectors. The illumination device is arranged so that light emitted from the second group of light sources through the one or more light collectors defines a pattern comprising one or more elongated elements.

Abstract: An electronic device is provided. The electronic device includes: a panel, a first support component, and a second support component. The panel includes a bottom surface, a first corner and a second corner, and the bottom surface is connected between the first corner and the second corner. The first support component includes a first side portion that supports the first corner of the panel. The first side portion has a first length and a first Young's modulus. The second support component includes a second side portion that supports the second corner of the panel. The second side portion has a second length and a second Young's modulus. The first length and the second length satisfy the following inequalities: 10 × W 2 ? ? k ? ? 1 × tan ? ? 1 ° ? L ? ? 1 < P 2 , and 10 × W 2 ? ? k ? ? 2 × tan ? ? 1 ° ? L ? ? 2 < P 2 , .

Abstract: The present disclosure provides a display apparatus. The display apparatus includes a display module including a display panel and a guide plate, a flexible printed circuit board extending from the display panel, a source printed circuit board connected to the flexible printed circuit board and attached to the guide plate, at least one driving chip disposed on the source printed circuit board, and a protective member disposed to cover the flexible printed circuit board, the source printed circuit board, and the driving chip.

Abstract: A display apparatus, comprising a functional layer on the light emitting side of a light source and a diffusion plate. A support for the diffusion plate is arranged between the light source and the functional layer, a cushion portion is arranged between the support and the functional layer, and the cushion portion is in contact with the support and the functional layer. Pressure of the support on the functional layer is reduced by providing the cushion portion between the support and the functional layer.

Abstract: Embodiments of the disclosure relate to a backlight unit and a display device including the same. Specifically, there may be provided a backlight unit with enhanced image quality and a display device in the same, which include a plurality of light sources disposed on a printed circuit and spaced apart from each other, a reflector disposed on the printed circuit and including at least one protrusion disposed to correspond to the at least one light source and a diffusion plate disposed on the reflector, wherein the protrusion surrounds at least one light source, and wherein the protrusion includes at least one opening in a side surface thereof.

Abstract: A backlight module includes a housing, a diffuser plate, an optical film, a holder and a light source. The housing has a groove. The groove is arranged along a periphery of the housing. The diffuser plate is disposed in the housing and has an edge located in the groove. The optical film is disposed on the diffuser plate and has a thru-hole. The holder is disposed in the groove of the housing and includes a holding portion and a hanging portion. The holding portion engages the edge of the diffuser plate. The hanging portion is connected to the holding portion and extends through the thru-hole of the optical film. The light source is disposed in the housing.

Abstract: A display device in the present disclosure includes: a display panel having a display on a front surface; a flexible circuit board connected to the display panel; and a panel chassis supporting a rear surface of the display panel. On an outer side of a lateral end of the display panel, the panel chassis has a flexible circuit board guide projected from the rear surface side of the display panel to the front surface side thereof. The flexible circuit board is provided along the flexible circuit board guide in a manner to extend on an outer side thereof.

Abstract: The present disclosure provides a backlight module and a display device. The backlight module includes a substrate layer and light-emitting diode (LED) light bars equidistantly disposed on the substrate layer. Wherein, each of the LED light bars includes a signal line and LED lamp beads. The LED lamp beads are arranged on the signal line and electrically connected to the signal line. Wherein, a distribution density of the LED lamp beads gradually decreases from a low-level end of the signal line to a high-level end of the signal line.

Abstract: The backlight device has a substrate, a plurality of light emitting elements disposed on a surface of the substrate, a diffuser plate having an incident surface disposed facing to the surface of the substrate, and an emitting surface disposed on the opposite side of the incident surface, diffuses light incident on the incident surface from the plurality of light emitting elements, and emits the diffused light from the emitting surface, and a frame defining a light emitting region on which the plurality of light emitting elements are disposed, wherein the frame is disposed so as not to form a region less than the half value outside the light emitting elements disposed along the frame, and all of the plurality of light emitting elements are disposed so that a ratio less than the half value is 20% or less, the ratio less than the half value is a ratio of an area of the region less than the half value to an area of a surrounding region formed by connecting at least three light emitting elements disposed around th

Abstract: A lighting module including a housing with a cavity enclosed with a light-emitting surface and in which an LED is mounted connectable to a power source and possibly also to a control circuit. Between the LED and the light-emitting surface is arranged a transparent optical filter having an upper surface and a lower surface. The upper surface is adapted for the passage of a minor portion of light from the cavity of the housing to the light-emitting surface and, at the same time, the upper surface is adapted to reflect most of the light from the cavity of the housing back to the lower surface.

Abstract: Disclosed are a curved backlight module and a display device. The curved backlight module includes: an optical film and a lamp board which are oppositely provided, the distance between the optical film and the lamp board being referred to as an optical cavity height; the lamp board is provided with a plurality of lamp bars which extend in a first direction and are arranged in a second direction, a plurality of lamp beads distributed in an array are provided on each of the lamp bars, and the distribution parameters of the lamp beads on each of the lamp bars are the same; and on each of the lamp bars, there is a first distance between two adjacent lamp beads in the first direction, and there is a second distance between two adjacent lamp beads in the second direction.

Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated with backlight illumination from a direct-lit backlight unit. The backlight unit may include an array of light-emitting diodes (LEDs) on a printed circuit board. The display may have a notch to accommodate an input-output component. Reflective layers may be included in the notch. The backlight may include a color conversion layer with a property that varies as a function of position. The light-emitting diodes may be covered by a slab of encapsulant with recesses in an upper surface.

Abstract: A driving method for a backlight module and a display device are disclosed. The driving method includes: generating mapping information from each local dimming area to the corresponding piece of local area dimming data according to preset positional relationships between a backlight driving chip and lamp beads in the backlight module; receiving, by a timing control chip, a frame of display data, and converting the display data into panel driving data and corresponding multiple pieces of local area dimming data; receiving, by a backlight driving circuit, the multiple pieces of local area dimming data in sequence, turning on the channel corresponding to the current local dimming area in turn according to the mapping information, and driving the lamp beads in the current local dimming area.

Abstract: A backlight includes a substrate, a plurality of light sources, a reflective layer, a light guide plate, a pattern of light extractors, a plurality of patterned reflectors, and a diffusive layer. The plurality of light sources are proximate the substrate. The reflective layer is on the substrate. The light guide plate is proximate the plurality of light sources. The pattern of light extractors is on the light guide plate. The plurality of patterned reflectors are on the light guide plate. Each patterned reflector is aligned with a corresponding light source. The diffusive layer is on the light guide plate.

Abstract: A display device includes a display panel and an optical member. The display panel includes a lower substrate and an upper substrate. The display panel forms a light-transmitting area and a display area near the light-transmitting area. The optical member is adjacent to a rear surface of the display panel and overlaps with a portion corresponding to the light-transmitting area. The display area includes a thin film transistor and an organic light emitting element configured to receive a current from the thin film transistor. The light-transmitting area does not include a metal layer, which is disposed in the display area. The upper substrate and the lower substrate do not have a through-hole structure in the light-transmitting area.

Abstract: The backlight device has a substrate, a plurality of light emitting elements disposed on a surface of the substrate, a diffuser plate having an incident surface disposed facing to the surface of the substrate, and an emitting surface disposed on the opposite side of the incident surface, diffuses light incident on the incident surface from the plurality of light emitting elements, and emits the diffused light from the emitting surface, and a frame defining a light emitting region on which the plurality of light emitting elements are disposed, wherein the frame is disposed so as not to form a region less than the half value outside the light emitting elements disposed along the frame, and all of the plurality of light emitting elements are disposed so that a ratio less than the half value is 20% or less, the ratio less than the half value is a ratio of an area of the region less than the half value to an area of a surrounding region formed by connecting at least three light emitting elements disposed around th

Abstract: A stepped light guide illumination system employing a planar sheet of an optically transmissive material having a stepped light guiding structure including one or more parallel arrays of channels. Light is input into the stepped light guiding structure using a number of side-emitting LED sources located within the channels and coupled to the stepped light guiding structure at multiple locations. The LED sources are mounted to a printed circuit board extending along one or more channels and having a width which is greater than a width of the respective channel. Light is extracted from the stepped light guiding structure using a two-dimensional pattern of light extraction features formed in a surface of the planar sheet.

Abstract: A planar illumination device of an embodiment includes a light guide plate, a plurality of light sources, an elastic member, and a bottom frame. The light guide plate receives light from a light incident side surface. The plurality of light sources emit light to the light incident side surface of the light guide plate. The elastic member presses and supports the light guide plate. The bottom frame houses the light guide plate, the plurality of light sources, and the elastic member. The bottom frame includes a pillar configured to protrude in a thickness direction at a position opposing substantially a center of the light incident side surface of the light guide plate in a longitudinal direction. The light guide plate includes, substantially at the center of the light incident side surface in the longitudinal direction, a groove configured to engage with the pillar. The elastic member presses a side of the light guide plate at a non-light incident side toward a light incident side.

Abstract: A frame assembly includes a carrier and a frame. The carrier includes a bottom wall, and inner and outer side walls. The bottom wall is formed with an opening. The inner side wall is located in the opening. The inner and outer side walls extend from the bottom wall along an upright direction. The inner and outer side walls respectively include first inner and outer engaging structures. The outer side wall is spaced from the inner side wall. The frame includes a frame body, and inner and outer lateral walls. The inner and outer lateral walls extend from the frame body and respectively include second inner and outer engaging structures. The outer lateral wall is spaced from the inner lateral wall. The first and second inner engaging structures are engaged with each other, and the first and second outer engaging structures are engaged with each other.

Abstract: The present invention relates to a backlight unit for use in a display device. The backlight unit includes a circuit board, at least one light-emitting diode chip mounted on the circuit board, a plurality of reflection members arranged on the upper part of the light-emitting diode chip, and a light diffusing member. The light diffusing member has an incident surface on which light enters and an emitting surface from which light is emitted. The light diffusing member is arranged on the upper part of the circuit board. The plurality of reflection members are stacked on each other and reflect a part of light emitted from the upper surface of the light-emitting diode chip.

Abstract: An optical device capable of varying transmittance, such that can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a sunroof for a vehicle.

Abstract: Disclosed is a display device. The display device includes: a light transmissive plate including a first front surface, a rear surface facing the first front surface, and a hole positioned behind the first front surface and connected to the rear surface; and a display film attached to the rear surface of the plate, in which the display film includes a light transmissive substrate having a second front surface attached to the plate, an electrode layer formed on the second front surface, and a light source electrically connected to the electrode layer, and the light source is positioned in the hole.

Abstract: A method of manufacturing a light emitting device, the method includes: preparing an intermediate structure including a supporter, a plurality of light emitting elements arranged on the supporter, a covering layer arranged on the supporter and surrounding the light emitting elements, and wiring electrodes each arranged on and straddling the covering layer and a corresponding one of the light emitting elements: preparing a board including light-reflective resin arranged on a surface of the board; pressing the intermediate structure against the light-reflective resin arranged on the board, with the wiring electrodes facing the light-reflective resin; curing the light-reflective resin to form a light-reflective resin layer; and removing the supporter.

Abstract: An image in a predetermined hue is displayed at a display surface, and is emitted as image light. The image light is guided to a display position by an optical system, and is deflected by a diffraction optical element. The emitted image light includes light emitted from a first position of the display surface and light emitted from a second position of the display surface. A deflection angle at which the light emitted from the first position is diffracted by the diffraction optical element is larger than a deflection angle at which the light emitted from the second position is diffracted by the diffraction optical element. Of the image light in a wavelength range expressing the hue, a wavelength peak of the light emitted from the first position is present on a long wavelength side with respect to a wavelength peak of the light emitted from the second position.