JP2009038006A - Planar light-emitting device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent degradation of the optical characteristics by displacement at assembling, as well as, to aim at high luminance, in a planar light-emitting device and a display device. <P>SOLUTION: The planar light-emitting device is provided with a light-emitting element package 6 equipped with a light-emitting element 3, a substantially rectangle-shaped package substrate 4 with the light-emitting element 3 mounted on a rectangle mounting surface, and a substantially rectangular-shaped transparent resin part 5 formed on the mounting face with the light-emitting element 3 sealed, a light guide plate 7, with a side end face fitted in a state of facing the front face of the transparent resin part 5 opposed to the mounting face, and a light-source side reflecting sheet 10, as well as, a light guide plate side reflecting sheet 11 fitted from a side end part of the top and bottom faces of the light guide plate 7 to the top and bottom faces of the transparent resin part 5 with each inner side as a reflective face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a surface light-emitting device and a display device that are used for, for example, a liquid crystal display and have excellent assemblability and can achieve high brightness.

  In general, liquid crystal display devices for displaying characters or images are widely used for displays such as mobile phones and PDAs. This liquid crystal display device uses a backlight unit that emits light from the back side of the liquid crystal display panel to increase the brightness of the display screen. In this backlight unit, for example, Patent Document 1 discloses that an LED, a light guide plate that receives light projected from the end face, diffuses the light from the end surface, and projects the light from the upper surface and the lower surface of the light guide plate are leaked. And a reflection sheet that reflects the light to be returned to the light guide plate.

  Patent Document 2 discloses an LED member having a protruding portion in which a transparent resin for sealing an LED chip protrudes forward in the light emitting direction, and a cut along the outer shape of the protruding portion on a side end surface facing the protruding portion. A planar illumination device has been proposed that includes a light guide plate having a notch and a reflector disposed on the upper and lower surfaces of the protrusion in a state where the protrusion is fitted to the notch.

Japanese Patent Laid-Open No. 2004-117606 JP 2006-228588 A

However, the following problems remain in the conventional technology.
That is, in the technique of Patent Document 2, it is necessary to assemble the LED member with the protruding portion of the LED member and the notch portion of the light guide plate with high accuracy. Due to the effects of misalignment, misalignment between the protruding part and the notch part, especially in the direction perpendicular to the light emitting direction, is likely to occur, which may result in a decrease in backlight luminance or a decrease in luminance uniformity. There is.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a surface light emitting device and a display device that can prevent a decrease in optical characteristics due to misalignment during assembly and can achieve high luminance. .

  The present invention employs the following configuration in order to solve the above problems. That is, the surface light-emitting device of the present invention includes a light emitting element, a substantially rectangular parallelepiped package substrate for mounting the light emitting element on a rectangular mounting surface, and a substantially rectangular parallelepiped shape formed on the mounting surface by sealing the light emitting element. A light-emitting element package having a transparent resin portion, a light guide plate installed in a state where a side end surface is abutted against the front surface of the transparent resin portion facing the mounting surface, and at least one of the upper and lower surfaces of the light guide plate One or a pair of reflecting sheets provided from the side end portion to at least one of the upper and lower surfaces of the transparent resin portion and having an inner reflection surface.

  In this surface light emitting device, the light guide plate is installed in a state where the side end surface is abutted against the front surface of the substantially rectangular parallelepiped transparent resin portion, so that both the front surface of the transparent resin portion serving as the light emission surface and the side end surface of the light guide plate are both. Since it has a planar structure, it is possible to reduce the deterioration of the optical characteristics and improve the assemblability even if the positional deviation occurs. In addition, the surface light emitting device includes one or a pair of reflection sheets provided from at least one side end portion of the upper and lower surfaces of the light guide plate to at least one of the upper and lower surfaces of the transparent resin portion, the inner side being a reflection surface. Therefore, the luminous flux emitted outward from at least one of the upper and lower surfaces of the transparent resin portion on which the reflection sheet is arranged can be reflected widely and efficiently and returned into the transparent resin portion or incident into the light guide plate, thereby increasing the brightness. Can be achieved. Further, when a reflection sheet is provided from the side edge of the upper surface of the light guide plate to the upper surface of the transparent resin portion, the light emitted from the light emitting element package by the reflection sheet is used as a light guide plate such as a diffusion sheet or a prism sheet. It can suppress that it injects directly into members other than this, and the effect that an appearance improves is acquired. In addition, it is possible to arrange a reflection sheet having a higher reflectance than when white resin is provided on the upper and lower surfaces of the transparent resin portion, and efficiently reflect the amount of light flux increased by eliminating the white resin. The brightness can be increased.

  In the surface light emitting device of the present invention, the reflection sheet is provided on one surface side of the upper and lower surfaces of the transparent resin portion, and an inner surface is formed on the other surface of the upper and lower surfaces of the transparent resin portion. A regular reflection surface portion which is a reflection surface is provided. That is, in this surface light emitting device, a reflective sheet is disposed on one surface side of the upper and lower surfaces of the transparent resin portion, and a regular reflection surface portion whose inner surface is a reflection surface is disposed on the other surface. The reflection sheet and the regular reflection surface portion reflect light on both the upper and lower surfaces of the transparent resin portion, whereby higher luminance can be obtained.

  The surface light-emitting device of the present invention is characterized in that the reflection sheet is provided over the entire length of the side end portion of the light guide plate. That is, in this surface light emitting device, since the reflection sheet is formed over the entire length of the side end portion of the light guide plate, not only the light emitting element package but also the light from the side is efficiently reflected to guide the light guide plate. Incorporation into, it is possible to obtain high brightness uniformity with less uneven brightness. In addition, it is not necessary to prepare the number of reflection sheets according to the number of light emitting device packages, and it can be reflected by one reflection sheet for one surface, and the member cost, the number of assembly steps, and the number of parts can be reduced. An increase can be prevented.

  Moreover, the surface light-emitting device of this invention is provided with the regular reflection surface part by which an inner surface is made into a reflective surface in the both-ends surface of the said transparent resin part, It is characterized by the above-mentioned. That is, in this surface light emitting device, the both sides of the transparent resin portion are provided with regular reflection surface portions whose inner surfaces are reflection surfaces, so that the light emitted from the both end surfaces of the transparent resin portion in the left-right direction is also regularly reflected. It is possible to further increase the luminance by reflecting the light inward from the surface portion and entering the light guide plate.

  Further, the surface light emitting device of the present invention includes a light guide plate side reflection sheet disposed on the lower surface of the light guide plate, and the light guide plate side reflection sheet extends to the lower surface of the transparent resin portion and the reflection sheet. It is characterized by having an extended portion. That is, in this surface light-emitting device, the light guide plate-side reflection sheet has an extended portion that extends to the lower surface of the transparent resin portion and serves as the reflection sheet. Therefore, it is necessary to prepare a reflection sheet on the lower surface separately. In addition, the overall thickness does not change and high brightness can be achieved.

  The surface light-emitting device of the present invention includes a flexible printed circuit board connected to the upper surface of the package substrate, and the reflective sheet disposed on the upper surface of the transparent resin portion is arranged adjacent to the flexible printed circuit board. It is provided. That is, in this surface light emitting device, since the reflective sheet on the upper surface of the transparent resin portion is provided adjacent to the flexible printed circuit board, even if the reflective sheet is employed, the overall thickness does not increase, and high brightness can be achieved. it can.

  The display device of the present invention includes an image display panel and the surface light-emitting device of the present invention as a backlight unit disposed on the back side of the image display panel. That is, in this display device, since the surface light emitting device of the present invention with high brightness is adopted as the backlight unit, a display with high brightness can be obtained.

  In the display device of the present invention, the image display panel is a liquid crystal display panel. That is, since this display device is a liquid crystal display device using a liquid crystal display panel, the display device can be reduced in thickness and can be reduced in weight and cost.

The present invention has the following effects.
That is, according to the surface light emitting device and the display device according to the present invention, the light guide plate is installed in a state where the side end surface is abutted against the front surface of the substantially rectangular parallelepiped transparent resin portion, and at least one side end of the upper and lower surfaces of the light guide plate Since one or a pair of reflective sheets is provided from at least one of the upper and lower surfaces of the transparent resin portion to the transparent resin portion, it is excellent in assembling by butting between flat surfaces, and the optical characteristics are not deteriorated due to misalignment. The light flux from at least one of the upper and lower surfaces of the transparent resin portion can be widely and efficiently reflected by the sheet, and the brightness of the light guide plate can be increased. Therefore, the display device of the present invention employing this surface light emitting device can maintain high optical characteristics by easy assembly, and is particularly suitable for a liquid crystal display such as a mobile phone or a PDA that requires high luminance.

  Hereinafter, a surface light emitting device and a display device according to a first embodiment of the present invention will be described with reference to FIGS. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.

As shown in FIG. 1, the display device of this embodiment is a liquid crystal display device applied to, for example, a mobile phone or a PDA liquid crystal display, and includes a liquid crystal display panel (image display panel) 1 and a liquid crystal display panel 1. And a backlight unit (surface light emitting device) 2 disposed on the back side.
In the present embodiment, the screen side of the liquid crystal display panel 1 and the light emission surface side of the backlight unit 2 are described as the surface side or the upper surface side.

  The backlight unit 2 in the present embodiment emits, for example, white light from the upper surface which is the main surface, and the light emitting element 3 and the light emitting element 3 are mounted in a rectangular shape as shown in FIGS. A plurality of light emitting device packages 6 each including a substantially rectangular parallelepiped package substrate 4 mounted on a surface and a substantially rectangular parallelepiped transparent resin portion 5 formed by sealing the light emitting device 3 and the mounting surface; The light guide plate 7 installed in a state where the side end face is abutted against the front surface of the transparent resin portion 5 facing the light source, and the light from the light guide plate 7 disposed on the light guide plate 7 is diffused to make the in-plane light intensity uniform. A diffusion sheet 8 that is disposed on the diffusion sheet 8 and emits light from the diffusion sheet 8 as upward irradiation light toward the liquid crystal display panel 1; The side edge of the top surface of the light plate 7 The light source side reflection sheet 10 that is provided over the upper surface of the transparent resin portion 5 and the inner side (transparent resin portion side) is a reflection surface, and the inner side (light guide plate side) provided from the entire lower surface of the light guide plate 7 to the lower surface of the transparent resin portion 5. Includes a light guide plate-side reflection sheet 11 that is a reflection surface, and a flexible printed circuit board 12 connected to the upper surface of the package substrate 4.

  The light emitting element 3 is a semiconductor light emitting element of a surface mount type LED mounted on the mounting surface of the package substrate 4 at a predetermined distance. This semiconductor light emitting element is, for example, a blue (wavelength λ: 470 to 490 nm) LED element or an ultraviolet light (wavelength λ: less than 470 nm) LED element, and a gallium nitride-based compound semiconductor (for example, on an insulating substrate such as a sapphire substrate). For example, a plurality of semiconductor layers of InGaN-based compound semiconductor) are stacked.

  Further, the transparent resin portion 5 for sealing the light emitting element 3 is a transparent resin containing, for example, a phosphor, and mainly contains a silicone resin or the like, and a YAG phosphor or the like is added thereto. This YAG phosphor converts white light or ultraviolet light from the light emitting element 3 into yellow light and generates white light by a color mixing effect. Therefore, the light emitting element 3 and the transparent resin portion 5 constitute a white LED. In addition, various things other than the above are employable as white LED by the light emitting element 3 and the transparent resin part 5. FIG.

As shown in FIG. 2, the light emitting element package 6 includes regular reflection surface portions 13 whose inner surfaces are reflection surfaces on both end surfaces of the transparent resin portion 5.
The package substrate 4 is formed of, for example, glass epoxy resin or the like, and a rectangular side surface is a mounting surface of the light emitting element 3.
In addition, a pair of electrode patterns 4 a which are terminal portions electrically connected to the electrodes of the light emitting element 3 are provided at both ends of the package substrate 4.

The light guide plate 7 is made of, for example, transparent polycarbonate resin or acrylic resin.
The regular reflection surface portion 13 is formed by adhering a regular reflection member such as white resin or silver to the transparent resin portion 5, or depositing a metal film having a light reflection function on the transparent resin portion 5.

  The light source side reflection sheet 10 is disposed and fixed on the upper surface of the flexible printed circuit board 12, and is provided over the entire length of the side end portion of the light guide plate 7 as shown in FIG. In FIG. 3, the light source side reflection sheet 10 is hatched for easy understanding. The light source side reflection sheet 10 is a sheet formed of, for example, a multilayer dielectric film having a higher reflectance (for example, 98% or more) than the regular reflection surface portion 13. Further, the light source side reflection sheet 10 is fixed by being attached to, for example, a holder (not shown) of each sheet of the flexible printed circuit board 12 and the backlight unit 2.

The light guide plate-side reflection sheet 11 is arranged so as to cover the entire lower surface of the light guide plate 7, and has an extension portion 11 a that extends to the lower surface of the transparent resin portion 5 and functions as a reflection sheet on the lower surface side. Yes. The light guide plate-side reflecting sheet 11 is a metal plate, film, foil or the like having a light reflecting function on the upper surface, and in this embodiment, a film provided with a silver vapor deposition film is employed. Note that an aluminum metal vapor deposition film or the like may be employed instead of the silver vapor deposition film. Moreover, you may arrange | position the sheet | seat for LCD fixation used in order to adhere each sheet | seats of the backlight unit 2 to a holder (not shown) as the said light-guide plate side reflection sheet 11. FIG. At this time, the upper surface side of the LCD fixing sheet is a reflecting surface such as silver having a light reflecting function.
The diffusion sheet 8 is made of, for example, a silica resin or the like dispersed in a transparent resin such as an acrylic resin or a polycarbonate resin.

  The first prism sheet 9A and the second prism sheet 9B are transparent sheet-like members for condensing the light from the diffusion sheet 8 on the upper surface side, and the prism portion having a plurality of parallel ridge lines on the upper surface side. Have. The first prism sheet 9A has the ridge line of the prism portion set at a twisted position with respect to the optical axis of the light emitting element package 6, and in particular, the light emitting element package 6 has a direction in which high directivity is obtained upward. It is set in parallel with the direction orthogonal to the optical axis. In the second prism sheet 9 </ b> B, the ridge line of the prism portion is set parallel to the optical axis of the light emitting element package 6. That is, in the first prism sheet 9A and the second prism sheet 9B, the ridge lines of the prism portions are arranged at twisted positions, and the ridge lines are orthogonal to each other in plan view.

  The liquid crystal display panel 1 is a transmissive or transflective liquid crystal display panel. For example, in the case of the transflective liquid crystal display panel 1, a panel body in which liquid crystal such as TN liquid crystal or STN liquid crystal is sealed with a sealing material in a gap between an upper substrate and a lower substrate each having a transparent electrode, an alignment film, and a polarizing plate. And a transflective plate having both light-transmitting and light-reflecting functions on its lower surface side.

  Thus, in the backlight unit 2 of this embodiment, since the light guide plate 7 is installed in a state where the side end surface is abutted against the front surface of the substantially rectangular parallelepiped transparent resin portion 5, the transparent resin portion 5 serving as a light emission surface is provided. Both of the front surface and the side end surface of the light guide plate 7 have a planar structure, so that even if a positional shift occurs, a decrease in optical characteristics is reduced and the assemblability is improved.

  Further, in the backlight unit 2, a pair of reflection sheets (the light source side reflection sheet 10 and the light guide plate side) which are provided from the side end portions of the upper and lower surfaces of the light guide plate 7 to the upper and lower surfaces of the transparent resin portion 5 and whose inner side is a reflection surface. Since the reflection sheet 11) is provided, the luminous flux emitted in the vertical direction from the upper and lower surfaces of the transparent resin portion 5 is reflected widely and efficiently by these reflection sheets and returned into the transparent resin portion 5 or incident into the light guide plate 7. The brightness can be increased. Furthermore, the light source-side reflection sheet 10 prevents light emitted from the light emitting element package 6 from directly entering members other than the light guide plate 7 such as the diffusion sheet 8, the first prism sheet 9A, and the second prism sheet 9B. Can be obtained, and the effect of improving the appearance can be obtained. In addition, the light source side reflection sheet 10 having a higher reflectance than the case where the white resin is provided on the upper and lower surfaces of the transparent resin portion 5 can be arranged, and the amount of luminous flux increased by eliminating the white resin is efficiently reflected. Thus, the light can be taken into the light guide plate 7 to increase the luminance.

  In addition, since the reflection sheet (the light source side reflection sheet 10 and the light guide plate side reflection sheet 11) is provided over the entire length of the side end portion of the light guide plate 7, not only the light emitting element package 6 but also the side thereof. By efficiently reflecting light and taking it into the light guide plate 7, luminance unevenness hardly occurs and high luminance uniformity can be obtained. Further, it is not necessary to prepare the number of reflection sheets corresponding to the number of the light emitting element packages 6, and it can be reflected by one reflection sheet for one surface, and the member cost, the number of assembly steps, and the number of parts are reduced. Can be prevented.

Furthermore, since the regular reflection surface portion 13 whose inner surface is a reflection surface is provided on both side end surfaces of the transparent resin portion 5, the light that spreads in the left-right direction from both side end surfaces of the transparent resin portion 5 is also the regular reflection surface portion 13. By making it reflect inward and making it inject into the light-guide plate 7, higher brightness can be achieved.
Moreover, since the light guide plate side reflection sheet 11 has the extension part 11a extended to the lower surface of the transparent resin part 5, it is not necessary to prepare the reflection sheet of the lower surface side of the transparent resin part 5 separately. At the same time, the overall thickness does not change, and high brightness can be achieved.

  Therefore, the display device including the backlight unit 2 can maintain high optical characteristics with easy assembly and can increase the brightness, and can be used for liquid crystals such as mobile phones and PDAs that require high brightness with little variation in quality. It is particularly suitable for a display or the like.

  Next, a second embodiment of the surface light emitting device and the display device according to the present invention will be described below with reference to FIG. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the light source side reflection sheet 10 is laminated on the upper surface of the flexible printed circuit board 12, whereas the second embodiment is different from the second embodiment. In the backlight unit 22, as shown in FIG. 4, the light source side reflection sheet 10 is arranged adjacent to the flexible printed circuit board 12. That is, the light source side reflection sheet 10 is arranged between the flexible printed circuit board 12 and the diffusion sheet 8. The light source side reflection sheet 10 is fixed by being attached to, for example, a holder (not shown) of each sheet of the light guide plate 7, the transparent resin portion 5, and the backlight unit 22.

  Thus, in 2nd Embodiment, since the light source side reflection sheet 10 is arrange | positioned adjacently to the flexible printed circuit board 12, even if it employ | adopts the light source side reflection sheet 10, it does not become thick as a whole, but high brightness is achieved. You can plan.

  Next, third and fourth embodiments of the surface light emitting device and the display device according to the present invention will be described below with reference to FIGS.

The difference between the third embodiment and the first embodiment is that, in the first embodiment, the light source side reflection sheet 10 is arranged on the upper surface of the transparent resin portion 5, whereas in the third embodiment, FIG. And as shown in FIG. 6, the regular reflection surface part 13 is formed also in the upper surface of the transparent resin part 5, and the point which does not have the light source side reflection sheet 10 is. That is, in the third embodiment, the regular reflection surface portions 13 are formed on the three surfaces of the transparent resin portion 5 on the both side surfaces and the upper surface of the light emitting element package 36, and the light source side reflection sheet 10 is omitted.
In addition, the flexible printed circuit board 32 extends to the side end portion of the light guide plate 7 and is disposed on the light emitting element package 36.

As described above, in the third embodiment, the light guide plate-side reflection sheet 11 reflects light on the lower surface of the transparent resin portion 5 and the regular reflection surface portion 13 reflects light on the upper surface of the transparent resin portion 5. Brightness can be increased by returning light from both.
Further, it is possible to achieve higher luminance by arranging the reflection sheets having a high reflectance on both the upper and lower surfaces of the transparent resin portion 5 as in the first embodiment, but in the third embodiment, the light source side Since the reflection sheet 10 can be omitted, the number of members can be reduced and the cost can be reduced.

  Further, since the flexible printed circuit board 32 extends to the side end portion of the light guide plate 7, the light from the light emitting element package 36 is shielded on the side end portion of the light guide plate 7, and this light is diffused sheet. 8 and prism sheets 9A and 9B can be prevented from directly entering members other than the light guide plate 7.

The difference between the fourth embodiment and the first embodiment is that, in the first embodiment, the light guide plate-side reflection sheet 11 extends to the lower part of the light emitting element package 6 whereas the fourth embodiment is different from the first embodiment. In the embodiment, as shown in FIGS. 7 and 8, the regular reflection surface portion 13 is also formed on the lower surface of the transparent resin portion 5, and the light guide plate side reflection sheet 41 does not extend to the lower surface of the transparent resin portion 5. is there. That is, in the fourth embodiment, in the light emitting element package 46, the regular reflection surface portions 13 are formed on the both sides and the bottom surface of the transparent resin portion 5, and the light guide plate side reflection sheet 41 is arranged on the lower surface side of the transparent resin portion 5. It has not been.
The flexible printed circuit board 42 is provided below the light emitting element package 46.

Thus, in 4th Embodiment, since the regular reflection surface part 13 reflects light in the lower surface of the transparent resin part 5, and the light source side reflection sheet 10 reflects light in the upper surface of the transparent resin part 5, it is both upper and lower surfaces. Thus, the brightness can be increased by returning the light.
Note that, as in the first embodiment, it is possible to achieve higher luminance when the reflective sheets having a high reflectance are arranged on the upper and lower surfaces of the transparent resin portion 5, but in the fourth embodiment, the transparent resin portion 5 is provided. The extension part of the reflection sheet leading to the lower surface of the light source becomes unnecessary, and the light guide plate side reflection sheet 41 with a small area is sufficient, so that the member cost can be reduced.

  In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

For example, in each of the above embodiments, as described above, it is preferable to provide the regular reflection surface portion 13 on both side end surfaces of the transparent resin portion 5, but the both side end surfaces of the transparent resin portion 5 are exposed without providing the regular reflection surface portion 13. It does not matter.
Moreover, although the diffusion sheet 8 is used in the above embodiment, a backlight unit in which the diffusion sheet 8 is omitted may be used.
Moreover, in the said embodiment, although the liquid crystal display panel 1 is employ | adopted as an image display panel, you may use another image display panel. For example, an image display panel such as electronic paper may be employed.

1 is a schematic cross-sectional view of a main part illustrating a display device in a first embodiment of a surface light emitting device and a display device according to the present invention. In 1st Embodiment, it is a perspective view which shows the light emitting element package. In 1st Embodiment, it is a schematic principal part top view which shows a display apparatus. In 2nd Embodiment of the surface emitting device and display apparatus which concern on this invention, it is a schematic principal part sectional drawing which shows a display apparatus. In 3rd Embodiment of the surface emitting device and display apparatus which concern on this invention, it is a schematic principal part sectional drawing which shows a display apparatus. In 3rd Embodiment, it is a perspective view which shows the light emitting element package. In 4th Embodiment of the surface emitting device and display apparatus which concern on this invention, it is a schematic principal part sectional drawing which shows a display apparatus. In 4th Embodiment, it is a perspective view which shows the light emitting element package.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel (image display panel) 2, 22 ... Backlight unit (surface light-emitting device), 3 ... Light emitting element, 4 ... Package substrate, 5 ... Transparent resin part, 6, 36, 46 ... Light emitting element package, 7 ... light guide plate, 10 ... light source side reflection sheet, 11, 41 ... light guide plate side reflection sheet, 13 ... regular reflection surface portion

Claims (8)

A light emitting device comprising: a light emitting device; a substantially rectangular parallelepiped package substrate for mounting the light emitting device on a rectangular mounting surface; and a substantially rectangular parallelepiped transparent resin portion formed on the mounting surface by sealing the light emitting device. Package,
A light guide plate installed in a state where a side end face is abutted against the front surface of the transparent resin portion facing the mounting surface;
One or a pair of reflecting sheets provided from at least one side end portion of the upper and lower surfaces of the light guide plate to at least one of the upper and lower surfaces of the transparent resin portion, the inner side being a reflecting surface. Surface emitting device. The surface emitting device according to claim 1,
The reflective sheet is provided on one surface side of the upper and lower surfaces of the transparent resin portion,
A surface light emitting device comprising a regular reflection surface portion whose inner surface is a reflection surface on the other surface of the upper and lower surfaces of the transparent resin portion. The surface emitting device according to claim 1 or 2,
The surface light-emitting device, wherein the reflection sheet is provided over the entire length of the side end portion of the light guide plate. In the surface emitting device according to any one of claims 1 to 3,
A surface light emitting device comprising a regular reflection surface portion having an inner surface as a reflection surface on both side end surfaces of the transparent resin portion. In the surface emitting device according to any one of claims 1 to 4,
A light guide plate-side reflective sheet disposed on the lower surface of the light guide plate;
The surface light-emitting device, wherein the light guide plate-side reflection sheet has an extension portion that extends to the lower surface of the transparent resin portion and serves as the reflection sheet. In the surface emitting device according to any one of claims 1 to 5,
A flexible printed circuit connected to the upper surface of the package substrate;
The surface light-emitting device, wherein the reflection sheet disposed on the upper surface of the transparent resin portion is arranged adjacent to the flexible printed circuit board. An image display panel;
A display device comprising: the surface light emitting device according to claim 1 as a backlight unit disposed on a back surface side of the image display panel. The display device according to claim 7,
The display device, wherein the image display panel is a liquid crystal display panel.

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