JP5383101B2 - Planar light source device and display device - Google Patents

Description

  The present invention relates to a light source using a light emitting diode as a light emitting element (hereinafter referred to as an LED light source), and particularly relates to a planar light source device and a display device using the LED light source.

  In the conventional LED light source, as shown in Patent Document 1, a light reflector that reflects the light emitted from the light emitting element in the lateral direction is attached to the mold tip of the LED light source.

  In the planar light source device described in Patent Document 2, a light source such as an LED light source is press-fitted into a light source insertion portion formed on the rear surface of the light guide plate, and a light reflecting surface is formed in front of the light source. This light reflecting surface shields the light emitted from the light source and traveling forward, and introduces the reflected light into the light guide plate from the side wall surface of the light source insertion portion, so that the luminance distribution on the light exit surface of the light guide plate is made uniform. Yes.

Japanese Utility Model Publication No. 7-3154 JP-A-10-82916

  However, when the LED light source described in Patent Document 1 is used, part of the light emitted from the light emitting element and reflected by the light reflector is absorbed by the light reflector. For this reason, the light extraction efficiency deteriorates, and the amount of light decreases. Further, in the planar light source device provided with the light source, when the upper part of the light source becomes dark and the uniformity of the in-plane luminance is further required, sufficient display quality cannot be obtained.

  Even when the planar light source device described in Patent Document 2 is used, light emitted in the vertical direction from the light emitting element is reflected by the light reflecting surface, so that a decrease in luminance occurs due to absorption by the light reflecting surface. In addition, there is a problem that luminance unevenness occurs in front of the light source without sufficient diffusion of light.

  Therefore, the present invention provides an LED light source capable of increasing the light extraction efficiency, a planar light source device using the LED light source, which can improve in-plane luminance uniformity and have sufficient display quality, and It aims at providing the display apparatus using the said planar light source device.

A planar light source device according to aspect 1 of the present invention includes a resin envelope having translucency, a light emitting element disposed on the bottom surface of the envelope, and molded in the envelope, A reflective member in which a hollow air layer is interposed between the non-adhered portion and the envelope in a non-adhered portion. An LED light source protruding in a bowl shape with respect to the side surface of the envelope, having a reflectance of 90% or more and a diffuse transmittance of 2% or more , and a hole having a step and the step formed on the light emitting surface side The LED light source is disposed in the hole portion of the light guide plate with the outer periphery of the reflective member protruding like a bowl fitted into the step of the hole portion .

A planar light source device according to aspect 2 of the present invention includes a resin envelope having translucency, a light emitting element disposed on the bottom surface of the envelope, and molded in the envelope, A reflective member that is attached in close contact with the upper surface of the container and whose outer periphery protrudes in a bowl shape with respect to the side surface of the envelope. The reflective member has a reflectance of 90% or more and a diffuse transmittance of 2% or more. An LED light source includes a light guide plate having a step and a hole having a step formed on the light emitting surface side, and the LED light source has a stepped portion in which the outer periphery of the reflecting member protruding in a bowl shape is a hole. And is disposed in the hole of the light guide plate .

  The LED light sources according to aspects 1 and 2 of the present invention can increase the light extraction efficiency, and the planar light source device using the LED light source and the display device using the planar light source device have in-plane luminance. Uniformity can be improved and sufficient display quality can be obtained.

(Embodiment 1)
FIG. 1 is a sectional view of an LED (Light Emitting Diode) light source according to the present embodiment. In FIG. 1, an LED light source 10 includes a light emitting element 1, a ceramic substrate 2 on which the light emitting element 1 is disposed on the bottom surface of the envelope 3, a resin envelope 3 having translucency for molding the light emitting element 1, A reflective member 4 mounted on the upper surface of the envelope 3 and a hollow air layer 5 between the envelope 3 and the reflective member 4 are provided.

  The light emitting element 1 of the LED light source 10 according to the embodiment of the present invention is die-bonded on a lead frame (not shown). The light emitting element 1 of the LED light source 10 is electrically connected by the other lead terminal and a bonding wire (both not shown).

  The lead frame of the LED light source 10 according to the present embodiment is formed on the ceramic substrate 2, and the electric power from the outside is provided on the surface (back surface) facing the surface on which the light emitting element 1 of the ceramic substrate 2 is die-bonded. A terminal portion (not shown) for connecting with a supply substrate and an FPC (flexible printed circuit board) with solder or the like is provided. As this terminal portion, copper or copper plated with gold is used. The terminal portion on the surface facing the surface to which the light emitting element 1 is die-bonded and the lead frame of the light emitting element portion are electrically connected through a through hole or the like.

  The light emitting element 1 used in the present embodiment is an LED, and for example, a point light source such as a light emitting diode or a laser diode (Laser Diode: LD) can be considered. The LED light source including the light emitting element 1 includes a semiconductor light emitting element that emits a single color such as blue, or a phosphor that absorbs a part of blue light emitted from the semiconductor light emitting element and emits yellow light. There is a pseudo white LED. In addition, there is an LED light source that emits white light by combining three monochromatic lights with semiconductor light emitting elements of RED (red), GREEN (green), and BLUE (blue). In the planar light source device according to the present embodiment, a case where a pseudo white LED light source is used as an LED light source will be described below.

  The ceramic substrate 2 is mainly made of low temperature co-fired ceramics (LTCC). The low-temperature fired ceramic uses a mixture of alumina aggregate and glass seat as a sheet, and uses a conductor such as Ag and Cu as an inner layer. In addition, LTCC is designed so that it can be fired at a temperature of about 900 degrees, which is lower than the melting point of a low resistance conductor such as Ag and Cu, while the firing temperature of alumina ceramics is about 1500 degrees. In addition, since ceramic is highly radioactive, heat generated from the light emitting element 1 can be efficiently guided to a heat radiating member such as the housing 8 (FIG. 2) through the substrate and the FPC. In addition, ceramics are widely used because of their high environmental resistance.

  The light emitting element 1 mounted on the upper portion of the lead terminal is sealed by a resin envelope 3 having translucency by transfer molding or injection method. As the envelope 3, a resin having high light transmittance and excellent heat resistance and UV resistance is used. For example, conventionally, epoxy resins have been widely used from the viewpoint of cost and productivity, but recently, silicones having higher heat resistance and light resistance have also been used.

  The translucent resin-made envelope 3 includes a bottom surface and an upper total reflection surface (hereinafter referred to as an upper reflection surface), and a side surface connecting the bottom surface and the outer peripheral end of the total reflection surface. The resin-made envelope 3 having translucency of the LED light source 10 according to the present embodiment is formed symmetrically about the light emitting element 1 as a central axis.

  On the upper surface of the envelope 3 facing the light emitting element 1, an upper reflecting surface having a linear shape symmetrical to the central axis is formed. The upper reflecting surface is light emitted from the light emitting element 1, and the light incident on the upper reflecting surface is totally reflected, and the upper portion of the light emitting element 1 has a curved surface close to the vertical direction so as to go to the side surface direction. It is designed so that the inclination becomes gentler as it goes away from 1.

  Here, in general, when light travels through different boundaries of the medium, light refraction occurs. In particular, when light travels from a medium with a high refractive index toward a medium with a low refractive index at the boundary between a medium with a high refractive index and a medium with a low refractive index, the light may be totally reflected without being refracted depending on the incident angle. . In the case of total reflection, the incident angle of light is not less than the critical angle, and the interface between the resin and air is generally assumed that the refractive index of resin is 1.5 and the refractive index of air is 1.0 according to Snell's law. It can be seen that the critical angle at is about 42 degrees.

  Thus, when the refractive index and incident angle of the two media are taken into account, the inclination or curvature of the upper reflecting surface of the present invention can be easily calculated.

  The curvature of the side surface can also be explained using Snell's law. The curvature or inclination here forms a curved surface so that light emitted from the curved surface is emitted in a direction perpendicular to the light emitting element 1 (left and right direction in the drawing). However, since almost all light incident on the side surface is emitted from the side surface, there may be a case where the light can be emitted from the original side surface without having the curvature described above with respect to the shape of the side surface. Here, it is assumed that the side surface shape of the envelope 3 has an arc shape in the longitudinal section.

  Thus, by making the side surface shape of the envelope 3 an arc shape, the light emitted from the curved surface can be emitted in a direction perpendicular to the light emitting element 1.

  A reflective member 4 is provided on the upper surface of the envelope 3 facing the light emitting element 1. The upper part of the envelope 3 has a straight part for joining with the reflecting member 4 at the boundary between the concave part (upper reflective surface) for reflecting light and the side surface, and the straight part and the reflective part are reflected. The member 4 is fixed tightly without the air layer 5 being interposed. That is, the reflective member 4 is attached to the upper surface of the envelope 3 in a partly close contact and partly in close contact, and a hollow air layer 5 is interposed between the reflection member 4 and the envelope 3 in the non-contact portion. . The shape of the hollow air layer 5 has a substantially conical shape.

  Thus, the critical angle at the boundary line between the envelope 3 and the air layer 5 can be satisfied by making the shape of the hollow air layer 5 substantially conical.

  The reflecting member 4 is made of PP (polypropylene) or PET (polyethylene terephthalate) mixed with barium sulfate or titanium oxide, resin is formed with fine bubbles, silver is vapor-deposited on metal, and titanium oxide is coated on a metal plate. A material coated with a pigment containing or a ceramic material the same as the substrate material is used. The reflecting member 4 preferably has a reflectance of 90% or more and a diffuse transmittance of 2% or more.

  By using such a reflecting member 4, the light extraction efficiency can be improved.

  When it is desired to improve the reflectance, the reflectance is further improved by stacking the plurality of reflecting members 4, and light can be efficiently emitted from the light source. The reflective member 4 can also be made of the same material as the ceramic substrate 2 on which the light emitting element 1 is mounted. Thus, by using the same material as the ceramic substrate 2, the material of the reflecting member 4 can be unified with the ceramic substrate 2, and the manufacturing cost can be reduced.

  Furthermore, the luminance profile of the light emitting surface 16 (FIG. 4) can be improved by printing, for example, a black dot pattern on at least one of the surface of the reflecting member 4 on the envelope 3 side or the opposite surface. it can.

  Further, for example, blue colored printing is performed on at least one of the surface of the reflecting member 4 on the envelope 3 side or the opposite surface, so that the color near the light source when used as a planar light source device and the other colors are used. It is better because the chromaticity of the parts can be adjusted and made identical.

  When the envelope 3 and the reflecting member 4 are partially adhered, they can be handled in the same manner as the light source, and the positional accuracy of the light emitting element 1 and the reflecting member 4 can be improved. Moreover, when making it a separate member, although the fixing method and assembly of the reflecting member 4 become difficult, these problems can be solved by integrating with the LED light source 10.

  FIG. 2 shows an exploded perspective view of a planar light source device using the LED light source 10 according to the first embodiment. FIG. 3 shows a cross-sectional view of the planar light source device according to the present embodiment. Further, FIG. 4 shows a detailed sectional view of the vicinity of the LED light source 10.

  In FIG. 2, the planar light source device includes a housing 8 having an opening 9 formed on one surface, an LED light source 10 held on a surface facing the opening 9 via an LED substrate 11, the opening 9 and the LED. A light guide plate 6 provided at a position covering the light source 10 and a cylindrical through-hole portion 7 provided at a position of the light guide plate 6 corresponding to the LED light source 10 and opening in the opening 9 of the housing 8 are provided. . In addition, it may replace with the hole part 7 and may be a bottomed recessed part.

  The light guide plate 6 is made of transparent acrylic resin, polycarbonate resin, glass and the like. The light guide plate 6 has a plate shape as shown in FIGS. 2 and 3, and the light emitting surface 16 on the upper surface of the light guide plate 6 is provided with a circular hole 7 so that the light guide plate 6 is hollowed out. It has been. Further, on the surface opposite to the light exit surface 16 of the light guide plate 6, a light scattering portion (not shown) for guiding the light to the light exit surface 16 while disturbing the light propagation direction is formed. This light scattering portion functions as a means for reflecting light toward the inside of the light guide plate 6. As a means for reflecting, a method of printing a dot pattern on the opposite surface of the light emitting surface 16, a method of roughening the opposite surface of the light emitting surface 16 to form a textured surface, or the opposite of the light emitting surface 16 A method of forming a minute spherical surface and unevenness on the surface side is conceivable.

  The LED light source 10 is mounted on the LED substrate 11 as shown in FIG. The LED substrate 11 holds the LED light source 10 and has a circuit pattern for supplying power to the LED light source 10.

  Moreover, the LED light source 10 can efficiently transmit the heat generated from the LED light source 10 to the surroundings by mounting the LED light source 10 on the LED substrate 11 which is a metal core (MC) substrate. Alternatively, the LED light source 10 is mounted on an FPC (Flexible Printing Circuit) having a thickness smaller than that of the MC substrate, so that the heat from the LED light source 10 can be more efficiently transmitted to the surroundings, and the outer size of the planar light source device. Can be miniaturized.

  A light diffusing plate 14 is disposed on the light emitting surface 16 of the light guide plate 6 (the opening 9 of the housing 8) as shown in FIG. The diffusion plate 14 is made of a material having a property of transmitting light, such as a resin plate such as PET (polyethylene terephthalate), PMMA (acrylic), or PC (polycarbonate), or a glass substrate. Further, the diffusion plate 14 has a function of scattering incident light by mixing a reflective material into the above material or roughening the surface. By using the diffuser plate 14 having the function, a planar light source device having a wide directivity can be obtained. Depending on the configuration of the planar light source device, a desired display quality may be obtained without providing the diffusion plate 14, and in this case, it is not necessary to provide the diffusion plate 14 in particular.

  Further, as shown in FIG. 3, optical sheets composed of a plurality of optical sheets 12 are provided on the diffusion plate 14. Optical sheets have a structure in which a lens sheet is sandwiched between diffusion sheets. When the luminance needs to be improved, the directions of the prisms formed on the individual sheets are optimally combined using a plurality of lens sheets. Furthermore, when improving the diffusibility by a diffusion sheet, the method of using two or more diffusion sheets can be considered. Depending on the light distribution characteristics of the lens sheet, one lens sheet or no lens sheet may be used. Further, a protective sheet and a polarizing reflection sheet may be combined with the optical sheets. In addition, it is desirable that the configuration of the optical sheets is an optimal sheet configuration in view of the required luminance, light distribution characteristics, and the like. A reflective sheet 13 is provided on the back surface of the light guide plate 6 (the surface opposite to the light emitting surface 16).

  Next, although not shown in FIGS. 2 and 3, a display panel is disposed on the planar optical device. As the display panel, a liquid crystal display panel using the birefringence of liquid crystal, a display panel on which characters and pictures are printed on a transparent plate, or the like can be considered. In this embodiment, the case of a display device using a liquid crystal display panel as a display panel will be described below.

  Here, the liquid crystal display panel has a counter substrate in which a colored layer, a light shielding layer, a counter electrode, and the like are formed on a substrate, a thin film transistor (hereinafter also referred to as a TFT) serving as a switching element, a pixel electrode, and the like. TFT array substrate. Furthermore, the liquid crystal display panel is sandwiched between the counter substrate and the TFT array substrate, a spacer for maintaining a distance between the counter substrate and the TFT array substrate, a sealing material for bonding the counter substrate and the TFT array substrate, and the like. It includes a liquid crystal, an inlet sealing material for injecting the liquid crystal, an alignment film for aligning the liquid crystal, and a polarizing plate. In the present invention, since an existing liquid crystal display panel is used, detailed description is omitted. Further, the display device includes a circuit board for driving the liquid crystal display panel.

  Next, in operation, a path from the time when the light emitted from the light emitting element 1 is emitted to the light emitting surface 16 of the light guide plate 6 and enters the liquid crystal display panel will be described. First, light emitted from the light emitting element 1 is emitted into the envelope 3. The light emitted above the light emitting element 1 is totally reflected by the upper reflecting surface of the envelope 3, guided in the horizontal direction, refracted from the side surface of the envelope 3, and the air layer (guided) of the hole 7. (Between the light plate 6 and the envelope 3).

  Next, the light directly incident on the side surface of the envelope 3 from the light emitting element 1 is refracted on the side surface of the envelope 3 as shown in FIG. Between the envelopes 3).

  On the other hand, there is also light that passes through the reflecting member 4 from the upper reflecting surface of some of the envelopes 3 and is emitted to the air layer. Light diffused and reflected from the light emitting element 1 by the ceramic substrate 2 and light emitted from the upper reflecting surface through the reflecting member 4 to the air layer because the upper reflecting surface is not an ideal mirror surface can be considered. Most of these lights are reflected by the reflecting member 4 located on the upper part of the LED light source 10, enter the envelope 3 again, and are emitted from the side surface of the LED light source 10. Is directly emitted from the light emitting surface of the planar light source device.

  Light emitted from the side surface of the LED light source 10 enters the light guide plate 6 from the hole 7 of the light guide plate 6. The light incident on the light guide plate 6 propagates inside the light guide plate 6 while repeating total reflection at the boundary between the light guide plate 6 and the air layer between the light guide plate 6 and the envelope 3. And the light which propagates the inside of the light-guide plate 6 is diffusely reflected by the dot pattern printing (not shown) given to the opposite surface of the light-projection surface 16 of the light-guide plate 6, and the propagation direction of light changes. Due to the change in the propagation direction of the light, the light that has become less than the critical angle with respect to the light guide plate 6 and the boundary of the air layer between the light guide plate 6 and the envelope 3 is emitted from the light exit surface 16 of the light guide plate 6. The

  Note that the light that has become less than the critical angle with respect to the boundary between the light guide plate 6 and the air layer between the light guide plate 6 and the envelope 3 is emitted from other than the light exit surface 16 of the light guide plate 6. The light is reflected by the reflection sheet 13 (FIG. 3) provided in the housing 8 and enters the light guide plate 6 again. Finally, the light is also emitted from the light exit surface 16 of the light guide plate 6.

  In the present embodiment, the shape of the light guide plate 6 is a plate shape, but the present invention is not limited to this, and the shape of the light guide plate 6 may be a wedge shape in which the plate thickness decreases as the distance from the LED light source 10 increases. good. The light guide plate 6 having a wedge shape can efficiently propagate the light to the light exit surface 16. Therefore, since the amount of reflected light is reduced in the reflection sheet provided on the side surface of the light guide plate 6, the reflection loss caused by the reflection sheet on the side surface can be reduced, and the emission amount at the light emission surface 16 is increased. It will be.

  Regarding the light emitted from the emission surface of the planar light source device, the light emitted from the upper part of the LED light source 10 is light that has passed through the reflecting member 4 provided at the upper part of the LED light source 10, and other than that. Light emitted from the emission surface is emitted through the light guide plate 6.

  Generally, the light transmitted through the reflecting member 4 may turn yellow because light on the low wavelength side is absorbed. Therefore, the display quality is deteriorated, for example, the chromaticity of the upper portion of the LED light source 10 is different from that of the other portions.

  Therefore, as described above, by performing colored printing such as blue on the reflecting member 4, it is possible to prevent the light transmitted through the reflecting member 4 from changing to yellow. Thereby, the display quality of the planar light source device can be improved.

(Embodiment 2)
FIG. 5 shows a detailed cross-sectional view of the planar light source device according to the present embodiment. FIG. 6 shows a detailed sectional view of another planar light source device according to the present embodiment. The planar light source device according to the present embodiment has the same configuration as that of the first embodiment except that the size of the reflecting member 4 is different. For this reason, in the planar light source device shown in FIGS. 5 and 6, the same components as those in the planar light source device shown in FIG. Moreover, there exists an effect similar to the planar light source device which concerns on Embodiment 1, except the effect of the surface light source device which concerns on this Embodiment demonstrated below.

  The reflecting member 4 of the present embodiment is approximately equal to or slightly smaller than the size of the hole 7 of the light guide plate 6. For this reason, the outer periphery of the reflecting member 4 protrudes from the upper part of the envelope 3 in a hook shape with respect to the side surface of the envelope 3, thereby forming a flange portion 15.

  Thereby, the light emitted from the side surface from the LED light source 10 (including the light totally reflected by the upper reflecting surface) is directly emitted from the gap between the hole portion 7 of the light guide plate 6 and the LED light source 10 and It is possible to prevent the vicinity from becoming bright in a circular shape.

  FIG. 6 shows a detailed sectional view of another planar light source device according to the present embodiment. In FIG. 6, the planar light source device does not have the air layer 5 formed between the upper reflecting surface and the reflecting member 4, and the side surface of the LED light source 10 is formed in a straight line instead of a curve in the vertical direction. That is, the side surface of the envelope 3 has a vertical straight line shape in the vertical cross section. Since there is no total reflection of the upper curved surface as compared with the LED light source 10 of FIG. 5, all the light traveling upward from the light emitting element 1 is reflected by the reflecting member 4 and emitted from the side surface.

  Accordingly, the LED light source 10 can be manufactured at low cost, and since the connection area of the reflecting member 4 to the envelope 3 is large, the envelope 3 and the reflecting member 4 are strongly connected. Is expensive.

  Also in the present embodiment of FIG. 6, the reflecting member 4 is larger than the envelope 3, and is approximately equal to or slightly smaller than the diameter of the hole 7 of the light guide plate 6. Thereby, it can prevent that light leaks from the clearance gap between the LED light source 10 and the hole 7 of the light-guide plate 6, and can obtain the planar light source device which was excellent in the display quality.

  Further, since the reflecting member 4 is extended from the resin-made envelope 3 having translucency and the flange 15 is formed by the reflecting member 4, the light emitted from the side surface of the envelope 3 is reflected by the reflecting member. Since it is guided to the hole 7 of the light guide plate 6 by the four flange portions 15, it can be efficiently guided to the light guide plate 6 without consuming light. Thereby, the brightness | luminance of a planar light source device can be improved.

(Embodiment 3)
FIG. 7 shows a detailed cross-sectional view of the planar light source device according to the present embodiment. The planar light source device according to the present embodiment has the same configuration as that of the second embodiment except that the size of the reflecting member 4 is different and the hole shape of the light guide plate 6 is different. For this reason, in the planar light source device shown in FIG. 7, the same components as those in the planar light source device shown in FIG. Moreover, there exists an effect similar to the planar light source device which concerns on Embodiment 2 except the effect specific to the planar light source device which concerns on this Embodiment demonstrated below.

  The hole 7 of the light guide plate 6 according to the present embodiment is composed of two steps as shown in FIG. The diameter of the second hole 7b having the opening on the light emitting surface 16 side is larger than the diameter of the first hole 7a having the opening on the opposite surface side of the light emitting surface 16. The diameter of the reflecting member 4 of the LED light source 10 is formed to be larger than the diameter of the first hole 7a and smaller than the diameter of the second hole 7b. The flange portion 15 of the reflecting member 4 is fitted and arranged in the step of the hole portion 7 of the light guide plate 6. The depth of the second hole 7b of the light guide plate 6 is desirably set so as not to interfere with the reflecting member 4 of the LED light source 10.

  In the LED light source 10, the planar light source device, and the display device according to the present embodiment, since the flange portion 15 of the reflective material 4 of the LED light source 10 is larger than the first hole portion 7a of the light guide plate 6, the light is emitted from the hole portion 7a. Light that leaks to the surface side can be completely prevented. For this reason, even if the position of the hole portion of the light guide plate 6 and the LED light source 10 are not accurately positioned, light leakage does not occur on the exit surface side, and it is possible to design a planar light source device having redundancy. Become.

  In the present embodiment, a step is provided in the hole 7 of the light guide plate 6 in the configuration of FIG. 6, but a step may be provided in the configuration of FIG.

It is sectional drawing of the LED light source which concerns on Embodiment 1 of this invention. 1 is an exploded perspective view of a planar light source device according to Embodiment 1 of the present invention. It is sectional drawing of the planar light source device which concerns on Embodiment 1 of this invention. It is detailed sectional drawing of the planar light source device which concerns on Embodiment 1 of this invention. It is detailed sectional drawing of the planar light source device which concerns on Embodiment 2 of this invention. It is detailed sectional drawing of the planar light source device which concerns on Embodiment 2 of this invention. It is detailed sectional drawing of the planar light source device which concerns on Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light emitting element, 2 Ceramic substrate, 3 Envelope, 4 Reflective member, 5 Air layer, 6 Light guide plate, 7 Hole part, 7a 1st hole part, 7b 2nd hole part, 8 Housing | casing, 9 Opening part DESCRIPTION OF SYMBOLS 10 LED light source, 11 LED board | substrate, 12 Optical sheet | seat, 13 Reflection sheet | seat, 14 Diffusion plate, 15 collar part, 16 Light-projection surface.

Claims (10)

A resin envelope having translucency;
A light emitting element disposed on a bottom surface of the envelope and molded in the envelope;
A reflective member that is attached to the upper surface of the envelope partly in close contact, partly in intimate contact, and has a hollow air layer interposed between the envelope and the non-adhered part;
With
The reflecting member protrudes like eaves its outer periphery to the side surface of the envelope, the reflectance of 90% or more, L ED light source and Ru der diffuse transmittance is 2% or more,
A light guide plate having a step and provided with a hole in which the step is formed on the light emitting surface side;
With
The said LED light source is a planar light source device by which the outer periphery of the said reflection member protruded in the said hook shape fits in the said level | step difference of the said hole, and is arrange | positioned in the said hole of the said light-guide plate . The hollow air layer has a substantially conical shape;
The planar light source device according to claim 1. A resin envelope having translucency;
A light emitting element disposed on a bottom surface of the envelope and molded in the envelope;
A reflective member that is mounted in close contact with the upper surface of the envelope and whose outer periphery protrudes in a bowl shape with respect to the side surface of the envelope;
With
The reflecting member, the reflectance of 90% or more, L ED light source and Ru der diffuse transmittance is 2% or more,
A light guide plate having a step and provided with a hole in which the step is formed on the light emitting surface side;
With
The said LED light source is a planar light source device by which the outer periphery of the said reflection member protruded in the said hook shape fits in the said level | step difference of the said hole, and is arrange | positioned in the said hole of the said light-guide plate . The side surface of the envelope has an arc shape in a longitudinal section.
The planar light source device according to any one of claims 1 to 3. A side surface of the envelope has a vertical straight line shape in a vertical cross section
The planar light source device according to claim 3. The reflective member has a dot pattern printed on at least one of the surface on the envelope side and the opposite surface thereof,
The planar light source device according to claim 1. The reflective member has colored printing applied to at least one of the surface on the envelope side and the opposite surface thereof,
The planar light source device according to claim 1. The colored printing is a blue printing;
The planar light source device according to claim 7. The LED light source is a white LED light source,
The planar light source device according to claim 1. A planar light source device according to any one of claims 1 to 9,
  A display panel disposed on the planar light source device;
A display device comprising:

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