JP2013157210A - Linear light source device, planar light-emitting device, and liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear light source device or the like capable of efficiently extracting light, even if a number of times of reflection of light is augmented.SOLUTION: A reflection plate 16 for reflecting light from light-emitting elements 12 is provided in a region surrounding the light-emitting elements 12 on a top face of a long and narrow substrate 13, and a translucent resin sealing layer 15 for sealing the light-emitting elements 12 is provided on the substrate 13, the light-emitting elements 12 and the reflection plate 16.

Description

  The present invention relates to a linear light source device, a surface light emitting device, and a liquid crystal display device. In particular, the present invention relates to a linear light source device, a surface light emitting device, and a liquid crystal display device that use a plurality of light emitting elements and are used as a backlight of a liquid crystal display panel.

  As a conventional surface light emitting device used for a liquid crystal display device such as a mobile phone or a digital camera, for example, a surface light emitting device 220 using a light emitting diode (hereinafter referred to as LED) as shown in FIG. FIG. 19A is a perspective view of a conventional light source device 210, FIG. 19B is an exploded view showing a surface light emitting device 220 including the conventional light source device 210, and FIG. 19C is a surface light emitting device. FIG. 220 is a cross-sectional view in the width direction of a conventional light source device 210 at 220.

  In the surface light emitting device 220 as shown in FIG. 19B, the wide first reflective sheet (lower reflective sheet) 202 and the upper surface of the first reflective sheet 202, one end thereof is the first reflective sheet. 202, the light guide plate 203 protruding from one end of the light source 202, the light source device 210 provided facing the side surface of the light guide plate 203, the end of the light emitting surface of the light guide plate 203, and the light source device 210 from above. It is comprised from the 2nd reflective sheet (upper reflective sheet) 204 integrated so that it might cover.

  The light source device 210 is provided in parallel with an elongated flat plate-like substrate 205 partially disposed on the lower surface of the protruding end of the light guide plate 203, and on the upper surface of the substrate 205 so as to be close to the side surface of the light guide plate 203. A horizontally long rectangular parallelepiped cup 200, a light emitting element (not shown) housed in the cup 200, and a transparent light-transmitting resin sealing portion 201 filled in the cup 200 are provided. A phosphor is mixed in the resin sealing portion 201.

  However, since the conventional light source device 210 as shown in FIG. 19 cannot suppress the thickness of the cup 200, there is a problem that it is difficult to reduce the thickness.

  Therefore, as a light source in which the cup 200 does not exist, for example, there is a linear light source device as disclosed in Patent Document 1. 20A is a perspective view of a linear light source device 310 (light source device) according to Patent Document 1, and FIG. 20B is a cross-sectional view taken along the longitudinal direction of the linear light source device 310 according to Patent Document 1. It is sectional drawing, (c) is an exploded view of the surface light-emitting device 320 provided with the linear light source device 310 concerning patent document 1, (d) is the line concerning patent document 1 in the surface light-emitting device 320. 6 is a cross-sectional view taken along the width direction of the light source device 310. FIG.

  As shown in FIGS. 20A to 20D, a linear light source device 310 according to Patent Document 1 includes an elongated flat plate-like substrate 305, a plurality of light emitting elements 306 on the substrate 305, and a plurality of light emitting elements 306. And a light-transmitting resin sealing portion 301. The plurality of light emitting elements 306 are arranged at intervals in the longitudinal direction of the substrate 305, and the reflector 300 is disposed on both sides of each light emitting element 306 and alternately with each light emitting element 306. Has been.

  In addition, a resin-sealing portion 301 is formed by filling a concave portion formed by the mounting surface of the substrate 305, the light emitting element 306, and the opposing surfaces of the reflecting plates 300 with a light-transmitting resin sealing material. ing. The surface light emitting device 320 includes a linear light source device 310 provided along the side surface of the light guide plate 303, a first reflection sheet 302 having a rectangular shape in plan view, and a second reflection sheet 304 having an elongated strip shape. ing. However, the linear light source device 310 according to Patent Document 1 has a problem that uneven luminance occurs when light is emitted with high luminance.

  Thus, for example, a linear light source device 410 disclosed in Patent Document 2 is a light-emitting device that can reduce luminance unevenness of the light guide plate. FIG. 21A is a perspective view of the linear light source device 410 according to Patent Document 2, and FIG. 21B is a cross-sectional view taken along the longitudinal direction of the linear light source device 410 according to Patent Document 2. (C) is an exploded view of a surface light emitting device 420 including a linear light source device 410 according to Patent Document 2. FIG.

  As shown in FIGS. 21A to 21C, in the linear light source device according to Patent Document 2, a plurality of light emitting elements 406 are arranged at intervals from each other along the longitudinal direction of an elongated flat plate-like substrate 405. Has been. Further, a resin sealing layer 409 is formed so as to cover the light emitting element 406. The resin sealing layer 409 includes a plane in which a first recess 407 existing between adjacent light emitting elements 406 and a second recess 408 formed immediately above the light emitting elements 406 are substantially parallel to the upper surface of the substrate 405. It is connected via the part 409a. The first recess 407 and the second recess 408 have a V-shaped cross section along the longitudinal direction of the substrate 405.

  As shown in FIGS. 21A to 21C, a resin sealing portion 401 mixed with a phosphor is provided in the vicinity of the light emitting element 406. In this way, even when a desired color is emitted with high luminance, a linear light source device with less luminance unevenness, bright lines, and chromaticity unevenness can be provided.

  Similarly to the surface light-emitting device 320 according to Patent Document 1, the surface light-emitting device according to Patent Document 2 includes a linear light source device 410 provided along the side surface of the light guide plate 403 and a first rectangular shape in plan view. The reflecting sheet 402 and the second reflecting sheet 404 in the form of an elongated strip are configured. When the surface light emitting device 420 is used for the liquid crystal backlight device, the liquid crystal display panel is installed on the upper surface (light emitting surface) side of the light guide plate 403.

  As the backlight becomes thinner, it is necessary to make the light emitting device thinner. Compared with the conventional light source device, the linear light source device according to Patent Documents 1 and 2 has an advantage that it can be made thinner because the cup 200 does not exist.

JP 2004-235139 A (published August 19, 2004) Japanese Unexamined Patent Publication No. 2009-21221 (released on January 29, 2009)

  In the linear light source device 410 according to Patent Document 2, the surface on which the reflection sheets 402 and 404 are provided is perpendicular to the upper surface of the substrate 405 as shown in FIG. For this reason, when the thickness of the linear light source device 410 is further reduced, the length in the width direction of the substrate 405 (the interval between the reflection sheets 402 and 404) becomes narrower, and the light emitting element 406, the first reflection sheet 402, and the first The number of light reflections between the two reflection sheets 404 increases.

  By the way, since the side surface (lateral surface) of the resin sealing layer 409 is generally formed by using dicing or the like, it has a rough surface with small irregularities on the surface. For this reason, when light from the light emitting element 406 is emitted from the resin sealing layer 409, reflected by the reflection sheets 402 and 404, and reentering the resin sealing layer 409, the side surface of the resin sealing layer 409 The unevenness causes scattering and absorption of the light.

  This problem is particularly noticeable when the linear light source device 410 is further reduced in thickness because the number of times of reflection of light on the reflection sheets 402 and 404 increases as described above, and light is efficiently extracted. Will not be able to. A similar problem occurs in the linear light source device 310 according to Patent Document 1.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a linear light source device that can efficiently extract light even when the number of reflections of light increases. .

  A linear light source device according to the present invention is a linear light source device that irradiates linear light from a plurality of light emitting elements arranged in a longitudinal direction on an elongated substrate, and in order to solve the above problems, A reflective member that reflects light from the light emitting element is provided at the end in the width direction of the upper surface of the substrate so as to face the light emitting element. On the substrate, the light emitting element, and the reflective member, A light-transmitting sealing member for sealing the light-emitting element is provided.

  According to the above configuration, the light emitted from the light emitting element in the width direction of the substrate is first reflected by the reflecting member and then emitted from the sealing member. Therefore, the number of times that the light is emitted from the sealing member attached to the substrate, reflected by the reflection sheet, and reentered the sealing member can be reduced, and the light is scattered by the sealing member. And can reduce absorption. As a result, by further reducing the thickness of the linear light source device, the scattering and absorption of the light can be suppressed and the light can be extracted efficiently even if the number of times of light reflection increases.

  The reflecting member may be provided in a region surrounding the light emitting element on the upper surface of the substrate. Further, the region surrounding the plurality of light emitting elements may be a region between the adjacent light emitting elements in addition to the region at the end in the width direction of the upper surface of the substrate. As the region where the reflecting member is provided becomes wider, the adhesion between the substrate and the reflecting member can be improved.

  In addition, the reflective member has a thickness in a direction perpendicular to the top surface of the substrate, and is located in a region at an end portion in the width direction of the top surface of the substrate, rather than a reflective member formed in a region between adjacent light emitting elements. It is preferable that the formed reflecting member is thinner. In this case, in the step of manufacturing the linear light source device, for example, in the step of covering the light emitting element with a resin containing a phosphor, the resin is continuously applied along the line in the width direction passing through the light emitting element. (Injection) can be performed, and the production efficiency can be improved.

  In the linear light source device according to the present invention, it is preferable that the reflecting member is inclined so as to reflect light directly reaching the light emitting element in a normal direction of the substrate. In this case, it is possible to further reduce the number of times the light is emitted from the sealing member, reflected by the reflection sheet, and re-entered the sealing member, and further reduces scattering and absorption of light by the sealing member. As a result, light can be extracted more efficiently.

  In the linear light source device according to the present invention, the sealing member is provided between the light emitting elements adjacent to each other, and bends light guided into the sealing member so that part or all of the light is transmitted. A first recess that guides the light to the outside, and a light that is emitted from the light emitting element in the normal direction of the upper surface of the substrate is bent, and a part or all of the light is guided into the sealing member. It is preferable to provide two recesses.

  In this case, part or all of the light from the light emitting element is guided into the sealing member by the second recess. Accordingly, it is possible to suppress luminance that is directly emitted from the light emitting element and tends to be high. In addition, part or all of the light guided into the sealing member is irradiated to the outside by the first recess. Accordingly, it is possible to increase the luminance that tends to decrease between adjacent light emitting elements. As a result, even when light is emitted with high luminance, uneven luminance and bright lines can be suppressed.

  In addition, it is preferable that the 1st recessed part of the said sealing member totally reflects the light guided in the said longitudinal direction within the said sealing member. In this case, since it can prevent that the said light is irradiated from the longitudinal direction edge part of the said sealing member, the brightness | luminance from the said linear light source device can be increased.

  Moreover, it is preferable that the 2nd recessed part of the said sealing member reflects all the lights irradiated from the said light emitting element to the normal line direction of the said board | substrate upper surface. In this case, the high luminance light from the light emitting element can be prevented from being directly irradiated to the outside, and thus the luminance unevenness can be further suppressed.

  In addition, as an example of the shape of the 1st recessed part of the said sealing member, and a 2nd recessed part, the shape of the cross section along the longitudinal direction of the said board | substrate is mentioned.

  In the linear light source device according to the present invention, it is preferable that an external connection terminal for supplying electricity to the plurality of light emitting elements is provided at an end in the longitudinal direction of the substrate. In this case, heat can be efficiently radiated from the longitudinal end of the substrate.

  In the linear light source device according to the present invention, it is preferable that the sealing member includes a phosphor and includes a fluorescent portion that covers each of the light emitting elements. In this case, chromaticity unevenness can be suppressed even when a desired color is emitted. Further, the light emitted from the sealing member can be set to an arbitrary chromaticity by appropriately selecting the type of the phosphor and the concentration of the phosphor dispersed in the translucent resin.

  In the linear light source device according to the present invention, the side surface in the longitudinal direction may be inclined with respect to the thickness direction of the substrate at the end of the light emitting element on the light emitting side. In this case, the light emitted from the light emitting element can be diffused into light that is directed upward and light that is inclined in the longitudinal direction. That is, light can be diffused in advance by the light emitting element itself as compared with a light emitting element having a general shape. Therefore, the light extraction efficiency of the linear light source device can be further improved.

  In addition, if it is a surface light-emitting device provided with the linear light source device of the said structure and the light-guide plate for radiate | emitting the light linearly incident from this linear light source device with planar light, it is the same as that of the above-mentioned There is an effect. In addition, the same effects as described above can be obtained as long as the liquid crystal display device performs display output by including the surface light emitting device having the above configuration and a liquid crystal display panel that modulates light from the surface light emitting device.

  As described above, the linear light source device according to the present invention is attached to the substrate because light emitted from the light emitting element in the width direction of the substrate is first reflected by the reflecting member and then emitted from the sealing member. The number of times that the sealing member is emitted, reflected by the reflection sheet, and re-entered the sealing member can be reduced, and the scattering and absorption of light by the sealing member can be reduced. Play. As a result, by further reducing the thickness of the linear light source device, the scattering and absorption of the light can be suppressed and the light can be extracted efficiently even if the number of light reflections increases. Play.

It is a perspective view of the linear light source device which is one Embodiment of this invention. It is sectional drawing which carried out the cross section of the said linear light source device along the longitudinal direction. It is a top view of the said linear light source device. It is sectional drawing which carried out the cross section of the said linear light source device along the width direction. It is a bottom view of the said linear light source device. FIG. 2 is a perspective view (upper view) and a plan view (lower view) of a light-emitting element in the linear light source device according to an embodiment with an end portion inclined, and (a) is a longitudinal direction side and a width direction. (A) is a figure which respectively shows the case where the longitudinal direction side is inclined, when the side is inclined. It is an exploded view of a surface light emitting device using the linear light source device. It is sectional drawing of the width direction of the said surface emitting device. It is a perspective view of the printed board material which formed the reflecting plate in the manufacturing process of the said linear light source device. In the said manufacturing process, it is a perspective view of the printed board material in which the resin sealing layer was formed. (A) is a schematic diagram which shows the locus | trajectory of the light radiate | emitted from the light emitting element to the width direction side in the said linear light source device. (B) is a schematic diagram showing a locus of light traveling in the longitudinal direction from the light emitting element in the linear light source device. In the said linear light source device, it is a schematic diagram which shows the locus | trajectory of the light radiate | emitted upward from the light emitting element, (a) is a case where the inclination angle is a gentle slope gentler than the critical angle of total reflection FIG. 5B is a schematic diagram showing a trajectory of light emitted upward from the light emitting element, and (b) is a top view from the light emitting element when the inclination angle is steeper than the critical angle of total reflection. It is a schematic diagram which shows the locus | trajectory of the light radiate | emitted in the direction. In the linear light source device, it is a schematic diagram showing a trajectory of light traveling from the second concave portion to the longitudinal direction side, (a) is a schematic diagram showing a trajectory near the first concave portion, (b), It is a schematic diagram which shows the locus | trajectory of the middle vicinity of a 1st recessed part and a 2nd recessed part, (c) is a schematic diagram which shows the case where the light with a small inclination which advances to a longitudinal direction side does not totally reflect in a 1st recessed part. (D) is a schematic diagram showing a case where light having a small inclination traveling in the longitudinal direction side is totally reflected by the first recess. It is a perspective view of the linear light source device which is other embodiment of this invention. It is sectional drawing which carried out the cross section of the said linear light source device along the longitudinal direction. It is a top view of the said linear light source device. It is sectional drawing which carried out the cross section of the said linear light source device along the width direction. It is a perspective view of the printed board material which formed the said resin sealing layer. (A) is a perspective view of a conventional light source device, (b) is an exploded view showing a surface light emitting device including the light source device, and (c) is the light source device in the surface light emitting device. It is sectional drawing of the width direction. (A) is the perspective view of the conventional linear light source device, (b) is sectional drawing which followed the longitudinal direction of this linear light source device, (c) is the said linear light source device. FIG. 4D is a cross-sectional view of the surface light emitting device taken along the width direction of the linear light source device. (A) is the perspective view of the conventional linear light source device, (b) is sectional drawing which followed the longitudinal direction of this linear light source device, (c) is the said linear light source device. FIG. In the said conventional linear light source device, it is a schematic diagram which shows the locus | trajectory of the light radiate | emitted from the light emitting element to the width direction side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1
(1. Basic configuration of the linear light source device 11)
FIG. 1 is a perspective view of a linear light source device 11 according to the first embodiment. FIG. 2 is a cross-sectional view of the linear light source device 11 taken along the longitudinal direction. FIG. 3 is a plan view of the linear light source device 11. FIG. 4 is a cross-sectional view of the linear light source device 11 taken along the width direction. FIG. 5 is a bottom view of the linear light source device 11.

  As shown in FIGS. 1 to 4, the linear light source device 11 irradiates linear light, and includes an elongated flat plate (strip shape) substrate 13 as a wiring substrate, a plurality of light emitting elements 12, and the like. A light-transmitting resin sealing portion (fluorescent portion) 14 (which may contain a phosphor), and a light-transmitting resin sealing layer (sealing member) 15 (preferably not including a phosphor); The reflecting plate (reflecting member) 16 is mirror-finished, and includes a first reflecting sheet 17 and a second reflecting sheet 18 as reflecting members.

  That is, the linear light source device 11 is a long and thin plate-like substrate 13 and a plurality of light emitting elements 12 that are installed on the upper surface of the substrate 13 and formed in a row at regular intervals in the longitudinal direction of the substrate 13; A reflection plate 16 formed in a layer shape so as to surround each of the plurality of light emitting elements 12 on the upper surface of the substrate 13, and a region where the light emitting elements 12 are surrounded by the reflection plate 16 so as to cover the light emitting elements 12. Resin sealing portion 14 filled with a conductive resin, a resin sealing layer 15 made of a translucent resin formed to cover the reflector 16 and the resin sealing portion 14, and a substrate in the resin sealing layer 15 And reflection sheets 17 and 18 formed so as to cover both side surfaces in the 13 width directions (hereinafter simply referred to as “width direction”).

  As shown in FIG. 1, the substrate 13 has an elongated flat plate shape (strip shape). As shown in FIGS. 1 to 3 and 5, the substrate 13 has anode external connection terminals 51 a and 51 b for supplying electricity to the light emitting element 12 and cathode external connection terminals 52 a and 52 b. doing. That is, the external connection terminals 51 a and 52 a are formed on the upper surface of the substrate 13, and the external connection terminals 51 b and 52 b are formed on the lower surface of the substrate 13. Here, the external connection terminals 51a and 52a on the upper surface of the substrate 13 and the external connection terminals 51b and 52b on the lower surface are respectively electrically connected via through holes (not shown).

  With the above structure, an inexpensive linear light source device can be provided without using a multilayer substrate. Further, by providing the external connection terminals 51a, 52a, 51b, and 52b, efficient heat dissipation can be performed. Further, the external connection terminals are provided at both ends of the substrate 13 in the longitudinal direction, so that heat is uniformly dissipated from the longitudinal ends of the substrate 13, and the external connection terminals are provided only on one side of the substrate 13 in the longitudinal direction. The heat dissipation efficiency is higher than that of the case.

  As shown in FIG. 2, the plurality of light emitting elements 12 are arranged in parallel on the upper surface of the substrate 13 at intervals in the longitudinal direction of the substrate 13. That is, on the upper surface of the substrate 13, a plurality of light emitting elements 12 are arranged in a line at a predetermined interval along the longitudinal direction of the elongated flat plate-shaped (strip-shaped) substrate 13.

  The light emitting element 12 is electrically connected to the external connection terminals 51a and 51b for the anode and the external connection terminals 52a and 52b for the cathode. Specifically, on the longitudinal direction side in the vicinity of the light emitting element 12, anode external connection terminals 51 a and 51 b or cathode external connection terminals 52 a and 52 b are electrically connected to positive electrode terminals (not shown). ) And negative electrode terminals (not shown).

  The positive electrode terminal, the negative electrode terminal, and the light emitting element 12 are electrically connected. For example, the electrical connection of the light emitting element 12 may be configured such that the positive electrode terminal and the negative electrode terminal are bonded to the light emitting element 12 by wires according to the wiring pattern of the substrate 13.

  The light emitting element 12 is made of an LED or the like. Examples of the light emitting element 12 include those using a known GaN compound semiconductor as a blue LED. The light emitting element 12 is formed by laminating an n-type layer and a p-type layer on a transparent sapphire substrate, and an n-type electrode or a p-type electrode is formed on the upper surface of each of the n-type layer and the p-type layer. May be.

  Each light emitting element 12 is covered with a translucent resin sealing portion 14. As the resin sealing part 14, what consists of an epoxy resin, a silicone resin, etc. which have high translucency may be used, for example. Furthermore, a known phosphor (preferably a granular phosphor) may be mixed or dispersed in the resin constituting the resin sealing portion 14.

  The resin sealing portion 14 is formed so as to cover the light emitting element 12 on the substrate 13. That is, the resin sealing portion 14 is formed in the vicinity of the light emitting element 12. In the example shown in the drawing, the resin sealing portion 14 has a form in which the opening portion of the reflection plate 16 provided with the light emitting element 12 is filled.

  That is, as shown in FIG. 3 and FIG. 4, the periphery of the light emitting element 12 is surrounded by the reflecting plate 16, and the reflecting plate 16 spreads toward the emission direction of each light emitting element 12. It is inclined. Alternatively, the resin sealing portion 14 may be filled in a concave portion that is formed in a shape of a truncated cone, a cylinder, a prism, a hemisphere, etc. with the light-emitting element 12 as the center.

  The resin sealing layer 15 is formed so as to cover the reflection plate 16 and the resin sealing portion 14. That is, the resin sealing portion 14 that covers each light emitting element 12 and the resin sealing layer 15 that covers each resin sealing portion 14 constitute a region made of resin.

  The resin sealing layer 15 is made of a resin having high translucency. The basic resin material constituting the resin sealing layer 15 may be the same as the basic resin material constituting the resin sealing portion 14. Examples of the highly translucent resin constituting the resin sealing layer 15 include translucent epoxy resins and silicone resins.

  The resin sealing layer 15 includes a center of the light emitting element 12 and has a substantially plane symmetrical shape with respect to a plane whose normal direction is the longitudinal direction of the substrate 13.

  That is, the resin sealing layer 15 is formed with a first recess 20 that is a groove having a V-shaped cross section. The first recess 20 is formed linearly in the width direction. Further, as shown in FIG. 2, the resin sealing layer 15 has a plurality of substantially isosceles trapezoids continuously separated in the longitudinal direction by being partitioned by the first recess 20 in the cross section in the thickness (thickness) direction ( They are arranged in parallel to the upper and lower bases of a substantially isosceles trapezoid.

  In the first recess 20, the first deepest portion 20 a, which is the deepest linear trough portion, has a uniform depth with respect to the surface of the resin sealing layer 15. The first deepest portion 20 a is formed in a V-shaped groove parallel to the width direction of the substrate 13. The first deepest portion 20a is near the reflector 16. That is, the first deepest portion 20 a has a depth of 4/5 to 2/3 of the thickness of the resin sealing layer 15.

  Further, the resin sealing layer 15 is a groove having a V-shaped cross section at the center of each isosceles trapezoidal shape (substantially directly above each light emitting element 12 (upward side)) in the cross section along the longitudinal direction. A second recess 21 is formed. The second recess 21 is formed linearly in the width direction. In the second recess 21, the second deepest portion 21 a, which is the deepest linear valley, has a uniform depth. That is, the first deepest part 20a and the second deepest part 21a are parallel.

  The second deepest portion 21a is shallower than the first deepest portion 20a and is in the vicinity of the middle of the thickness of the resin sealing layer 15. That is, the second deepest portion 21 a is formed with a depth of ½ to 2/3 of the thickness of the resin sealing layer 15. Moreover, it is preferable that the inclination angle of the side surface of the groove having the V-shaped cross section of the second recess is equal to or greater than the critical angle of total reflection of light traveling in the thickness direction of the substrate.

  As shown in FIG. 4, the first reflection sheet 17 is affixed to the end face on one side in the width direction of the substrate 13, the reflection plate 16, and the resin sealing layer 15. On the other hand, the 2nd reflection sheet 18 is affixed on the end surface of the other side of the width direction of the board | substrate 13, the reflecting plate 16, and the resin sealing layer 15. FIG.

  The reflector 16 is formed continuously in the longitudinal direction of the substrate 13 so as to surround each of the plurality of light emitting elements 12. That is, it is formed in the longitudinal direction of the light emitting element 12 and the width direction of the light emitting element 12. The reflecting plate 16 only needs to have a reflective surface, and is formed of a highly reflective specular reflector, diffuse reflector, or a combination of both.

  In particular, the configuration has high reflectivity in the wavelength range of light emitted from the light emitting element 12 and in the wavelength range of light emitted from the phosphor excited by the light from the light emitting element 12. preferable.

  Moreover, it is preferable that the thickness of the reflecting plate 16 (distance A in FIG. 4) is 1/2 to 1/3 of the thickness of the resin sealing layer 15 (distance B in FIG. 4). Since the linear light source device 11 is obtained by cutting a substantially square printed board 40 (see FIG. 9) into a long and narrow square bar shape by dicing or the like, small irregularities are formed on the surface of the side surface of the resin sealing layer 15 and rough. It is faced.

  Therefore, when the 1st reflective sheet 17 and the 2nd reflective sheet 18 are adhere | attached on the side surface of the resin sealing layer 15, and it is set as the structure which reflects the light to the width direction, the surface of the side surface of the resin sealing layer 15 is rough. Therefore, light is absorbed between the resin sealing layer 15, the first reflection sheet 17, and the second reflection sheet 18.

  Therefore, a mirror-finished reflecting plate 16 is provided, and the resin sealing layer 15 and the first reflecting sheet 18 are reduced by reducing the range in which the resin sealing layer 15 contacts the first reflecting sheet 17 and the second reflecting sheet 18. 17, the absorption of light generated between the second reflection sheets 18 can be suppressed, and improvement in light extraction efficiency can be expected. In particular, it is preferable to form the thickness of the reflection plate 16 (the thickness of the resin sealing portion 14) in the range of 1/2 to 1/3 with respect to the thickness of the resin sealing layer 15 (distance B). .

  The reflective plate 16 is arranged at the end in the width direction of the upper surface of the substrate 13 so as to face the light emitting device 12 in order to reduce multiple scattering among the light emitting device 12, the first reflective sheet 17, and the second reflective sheet 18. The reflector 16 may be disposed between the adjacent light emitting elements 12 in order to improve the close contact with the substrate 13.

(1-1. Configuration of Light-Emitting Element 12)
In the present embodiment, a conventionally known light emitting element having a general shape may be used as the light emitting element 12, but a light emitting element having a shape as shown in FIG. 6A or 6B may be used. . FIGS. 6A and 6B are a perspective view (upper view) and a plan view (lower view), respectively, showing a light emitting element whose end is inclined.

  In the light emitting element shown in FIG. 6A, the side surfaces in the longitudinal direction and the width direction are inclined with respect to the thickness direction of the substrate at the light emitting side end (upper part) of the light emitting element. It has a shape. With this shape, the light emitted from the light emitting element can be diffused into light that is directed upward, light that is inclined in the longitudinal direction, and light that is inclined in the width direction. That is, light can be diffused in advance by the light emitting element itself as compared with a light emitting element having a general shape.

  The light emitting element shown in FIG. 6B has a shape in which the side surface in the longitudinal direction is inclined with respect to the thickness direction of the substrate at the end of the light emitting element on the light emitting side. With this shape, light can be diffused into light traveling upward and light inclined toward the longitudinal direction. That is, since the light inclined in the width direction of the substrate 13 can be suppressed as compared with the light emitting element of FIG. 6A, the light extraction efficiency of the linear light source device 11 can be further improved.

  The inclination angle in the light-emitting element shown in FIG. 6A or 6B may be appropriately adjusted to an angle at which high light extraction efficiency can be obtained.

(2. Basic structure of surface emitting device)
FIG. 7 is an exploded view of the surface light-emitting device 61 manufactured using the linear light source device 11 according to the present embodiment. FIG. 8 is a cross-sectional view of the surface light emitting device 61 in the width direction.

  As shown in FIGS. 7 and 8, the surface light emitting device 61 is provided along the first reflective sheet 17 having a rectangular shape in plan view, the flat light guide plate 62, and one side surface of the light guide plate 62. The linear light source device 11 and an elongated strip-shaped second reflection sheet 18 are provided.

  The first reflection sheet 17 is made of, for example, a mirror-like tape or a sheet-like member having a high light reflectance such as white. A region from the light guide plate 62 to the substrate 13 is covered by the first reflection sheet 17. For this reason, the light traveling from the linear light source device 11 toward the first reflection sheet 17 is reflected by the first reflection sheet 17 and returned to the light guide plate 62.

  The light guide plate 62 is a transparent plate made of, for example, acrylic resin or polycarbonate resin and having a thickness of 0.2 to 1.0 mm. The surface light-emitting device 61 can be a part of a liquid crystal display device. In that case, a liquid crystal display panel (not shown) that modulates light from the surface light emitting device 61 may be disposed on the side of the light guide plate 62 where the second reflective sheet 18 is formed.

  When the width in the width direction of the substrate 13 in the linear light source device 11 is larger than the thickness of the light guide plate 62, the thickness of the light guide plate 62 in the vicinity of the light intake port is set so that the shape of the intake port faces the end surface. The width in the width direction of the substrate 13 of the linear light source device 11 may be matched with the thickness of the end face of the light guide plate 62.

  The linear light source device 11 is installed such that the longitudinal axis of the linear light source device 11 faces the side surface 63 of the light guide plate in parallel. In the light guide plate 62, the shape of the side surface 63 facing the light emitting side surface (the surface of the resin sealing layer 15) of the linear light source device 11 is an uneven shape that matches the shape of the resin of the resin sealing layer 15. Also good. In this case, the light coupling efficiency between the light source unit and the light guide plate can be improved.

  The second reflective sheet 18 may be made of the same material as the first reflective sheet 17. Due to the second reflection sheet 18, on one side surface of the linear light source device 11 (surface on which the first reflection sheet 17 is not formed), an area from the end of the light guide plate 62 to the substrate 13, that is, in the light guide plate 62. It is formed so that the end on the light emitting element 12 side is covered.

  By the first reflection sheet 17 and the second reflection sheet 18, the light of each light emitting element 12 emitted from both side surfaces (width direction) of the resin sealing layer 15 is transmitted between the light guide plate 62 and the linear light source device 11. Therefore, the light from each light emitting element 12 can be incident on the light guide plate 62 without being left behind.

(3. Manufacturing method of the linear light source device 11)
An example of the manufacturing method of the linear light source device according to the first embodiment will be described. FIG. 9 is a perspective view of the printed board 40 on which the reflector 16 according to the first embodiment is formed. FIG. 10 is a perspective view of the printed board 40 on which the resin sealing layer 15 is further formed.

  First, a wiring pattern is formed on the substantially square printed board 40 (process for forming a wiring pattern). Examples of the printed board 40 include white glass BT (bismaleimide triazine) copper-clad laminate.

  Next, as shown in FIG. 9, the reflecting plate 16 is formed on the printed board material 40 (step of forming the reflecting plate). The reflecting plate 16 is inclined so that the opening area becomes larger toward the emission direction (upward direction) of each light emitting element, and a resin such as liquid crystal polymer (LCP) or polyphthalamide (PPA). And is formed by a method of pasting the printed board 40 with an adhesive or a method of directly molding the printed board 40.

  Next, the light emitting element 12 (not shown) is die-bonded to the mounting surface of the printed board 40 from the opening of the reflecting plate 16 and wire-bonded to be electrically connected (step of installing the light emitting element).

  Thereafter, a translucent resin containing a phosphor is applied (filled) to the opening of the reflector 16 using a resin coating device (not shown) to form the resin sealing portion 14. The translucent resin sealing portion 14 is formed, for example, by applying (filling) a resin in which a phosphor is dispersed in a silicone resin from the upper side of the light emitting element 12 and curing it (resin) Step of forming a sealing portion).

  Further, as shown in FIG. 10, the translucent resin sealing layer 15 is formed in a region surrounded by the reflecting plate 16, the translucent resin sealing portion 14 including a phosphor, and a molding die. For example, it is formed by injecting and curing a silicone resin (step of forming a resin sealing layer).

  Thereafter, as shown in FIG. 10, the printed board 40 is elongated and cut into a square bar shape by dicing to form an elongated strip-shaped substrate 13 (dicing step).

  Further, as shown in FIG. 8, the light guide plate 62 is mounted, and the first reflection as a reflection member is provided on each of the substrate 13, the reflection plate 16, both sides of the resin sealing layer 15 in the width direction, and both sides of the light guide plate 62. By mounting the sheet 17 and the second reflection sheet 18, a surface light emitting device including the linear light source device 11 according to the present embodiment can be manufactured.

(4. Main effects of the linear light source device 11)
FIG. 11A is a schematic diagram showing a locus of light emitted from the light emitting element 12 to the width direction side in the linear light source device 11 according to the present embodiment. FIG. 11B is a schematic diagram showing a trajectory of light traveling in the longitudinal direction from the light emitting element 12 in the linear light source device 11.

  According to the linear light source device 11 according to this embodiment, the mirror-finished reflector 16 is formed so as to surround the light emitting element 12. Thus, the light emitted from the light emitting element 12 in the width direction is first reflected by the reflecting plate 16 and then emitted from the resin sealing layer 15. Therefore, it is possible to reduce the number of times that the light exits from the resin sealing layer 15, is reflected by the reflection sheets 17 and 18, and reenters the resin sealing layer 15. Thereby, the scattering and absorption of the light which arise by the unevenness | corrugation in the side surface of the width direction of the resin sealing layer 15 which is an adhesive surface of the reflective sheets 17 and 18 and the resin sealing layer 15 can be suppressed. As a result, by further reducing the thickness of the linear light source device 11, the scattering and absorption of the light can be suppressed and light can be extracted efficiently even if the number of times of light reflection increases.

  Further, the reflecting plate 16 is inclined so as to become wider toward the light emitting direction of the light emitting element 12. Therefore, multiple scattering can be reduced in the first reflection sheet 17 and the second reflection sheet 18. Furthermore, as shown in FIG. 11A, light emitted from the light emitting element 12 with a large inclination in the width direction and the longitudinal direction side can be inclined upward, and the light can be emitted more efficiently. Can do.

  Further, as shown in FIG. 11B, light emitted upward from the light emitting element 12 or the like travels efficiently in the longitudinal direction through the resin sealing layer 15 by the second recess 21 (waveguide). Light that travels in the longitudinal direction can be taken out from the first recess 20.

  That is, the light emitted upward from the light emitting element 12 is diffused into the light extracted from the first recess 20 and the light extracted from the second recess 21, that is, the light emission form of the linear light source device ( Luminance and bright line distribution) are diffused in the longitudinal direction, and unevenness of bright lines and luminance of emitted light can be made difficult to occur.

  In general, when the phosphor is dispersed in the resin of the resin sealing portion 14, the phosphor concentration is slightly different in the manufacturing process. Color unevenness occurs in the emitted light. On the other hand, in the present embodiment, the light emitted from one light emitting element 12 or the like and the light emitted from the other adjacent light emitting element 12 or the like can be mixed in the first recess 20. The light that has passed through the different resin sealing portions 14 can be mixed, and color unevenness can be further suppressed.

  The above will be described in more detail. According to the linear light source device 11 according to the present embodiment, as shown in FIG. 11, the light emitted from the light emitting element 12 or the resin due to the formation of the second recess 21. When the phosphor is dispersed in the sealing portion 14, the light emitted from the phosphor with the light from the light emitting element 12 can be efficiently totally reflected on the surface of the second recess 21. It is possible to suppress going out directly toward the upper side.

  The light totally reflected on the surface of the second recess 21 is a plane connecting the second recess 21 and the first recess 20 inside the resin sealing layer 15 (the plane on the upper side of the resin sealing layer 15); The light travels in the longitudinal direction by reflection (bending) and total reflection occurring between the reflector 16 and the reflector 16. And the light which progresses to a longitudinal direction side can be efficiently extracted from a 1st recessed part. As a result, the amount of light exiting from the second recess 21 can be reduced, the amount of light traveling in the longitudinal direction can be increased, and the amount of light exiting from the first recess 20 can be reduced. Can be bigger.

  That is, the light distribution characteristics of light can be controlled, the luminance in the vicinity of the upper side of the light emitting element 12 that tends to be excessively bright can be suppressed, and two adjacent light emitting elements that are likely to have low luminance because there is no light emitting element The luminance of the 12 intermediate regions can be improved by efficiently extracting light guided in the longitudinal direction. Therefore, it is possible to improve the uniformity in the longitudinal direction of the emission intensity at the emission end face of the linear light source device.

  Furthermore, the light emitted from the second recess 21 is refracted (bent) by the second recess 21 and the traveling direction of the light deviates from the upper direction, so that the light distribution can be diffused in the longitudinal direction.

  Therefore, even if high luminance light is emitted from the surface light emitting device by mounting this linear light source device with high luminance uniformity on the surface light emitting device, the bright line unevenness and the luminance unevenness of light hardly occur. can do.

  On the other hand, in the case where the phosphor is dispersed in the resin of the resin sealing portion 14, a conventional line in which reflectors and light emitting elements are alternately arranged as shown in FIGS. In the light source device, since the light emitting elements are independent by the concave portions formed by the reflector, the light emitted from the adjacent light emitting elements 12 cannot be mixed.

  On the other hand, in the linear light source device 11 according to the present embodiment, a reflection plate disposed with respect to the periphery of the light emitting element 12, and a resin sealing layer disposed so as to cover the plurality of light emitting elements and the reflection plate. 15 and the first concave portion and the second concave portion formed in the resin sealing layer 15 allow the light emitted from the adjacent phosphors to mix and suppress color unevenness.

(4-1. Reflector 16)
As shown in FIG. 11A, in the present embodiment, the light emitting element 12 includes the reflecting plate 16 that is inclined so that the opening is widened. Therefore, the light emitted from the light emitting element 12 in the width direction is particularly large. The light can be efficiently emitted upward by the reflecting plate 16. That is, multiple scattering between the first reflection sheet 17 and the second reflection sheet 18 can be reduced, and light can be emitted efficiently.

(4-2. Regarding the second recess 21)
More specifically, the principle of using the second recess 21 to convert light emitted upward from the light emitting element 12 into light that travels (waveguides) in the longitudinal direction in the resin sealing layer 15 will be described in detail. In the linear light source device according to the present embodiment, the inclination angle of the inclined surface of the second recess 21 is inclined more than the critical angle θc of total reflection. In other words, the second recess 21 has a form in which light emitted upward from the light emitting element 12 or the like is totally reflected in the longitudinal direction. That is, by making the inclination angle of the second recess larger than the critical angle θc of total reflection, the traveling direction of the light emitted upward from the light emitting element can be efficiently changed to the longitudinal direction side.

Here, total reflection occurring on the boundary surface of the resin portion will be described with the outside of the linear light source device as the atmosphere. In this case, the critical angle θc of total reflection is obtained by the following equation (1).
n · sin θc = 1 (1)
In the formula (1), n represents the refractive index of the resin. In general, the refractive index has light wavelength dependency. Therefore, in the present embodiment, the refractive index of the resin is considered based on the center wavelength (emission peak wavelength) of the light emitted from the light emitting element 12.

  For example, when a blue light-emitting element having a wavelength of 455 nm is used as the light-emitting element, the refractive index n of the resin of the resin sealing layer 15 is 1.5, and the critical angle θc of total reflection is approximately 42 ° when calculated from the above equation. It becomes.

  A more specific description will be given based on FIGS. 12 (a) and 12 (b). FIGS. 12A and 12B are schematic diagrams illustrating a locus of light emitted upward from the light emitting element 12 in the linear light source device 11 according to the present embodiment.

  FIG. 12A shows light emission when the inclination angle θ of the surface of the second recess 21 is a gentle slope that is gentler than the critical angle θc of total reflection of light emitted upward from the light emitting element 12. FIG. 6 is a diagram showing a trajectory of light emitted upward from an element 12. In FIG. 12A, light 502 is a locus of light emitted upward from the light emitting element 12, and light 503 is on the surface of the second recess 21 (interface between the resin sealing layer 15 and the outside). It is a locus of light emitted to the outside after refraction.

  FIG. 12B shows the case where the inclination angle θ of the surface of the second recess 21 is steeper than the critical angle θc of total reflection of light emitted upward from the light emitting element 12. FIG. 4 is a schematic diagram showing a locus of light emitted upward from the light emitting element 12. In FIG. 12B, light 500 is a trajectory of light emitted upward from the light emitting element 12, and the light 501 is entirely on the surface of the second recess 21 (interface between the resin sealing layer 15 and the outside). This is a trajectory of light traveling in the longitudinal direction inside the resin sealing layer 15 after reflection.

  As shown in FIG. 12A, when the inclination angle θ of the surface of the second recess 21 is small and the inclination angle θ <θc, the light 502 emitted from the light emitting element 12 in the axial direction is 2 Refracted on the surface of the recess 21 and deflected from above. A part of the light is emitted to the outside 503, and the brightness of the light directly emitted upward from the light emitting element 12 can be reduced. Further, the light is refracted by the second recess 21 and the traveling direction is deflected from the upward direction. be able to. Since the light emitted from the second recess 21 can be diffused in the longitudinal direction, the uniformity of the light emission intensity of the linear light source device 11 can be improved, and the unevenness of brightness and the unevenness of color can be suppressed.

  On the other hand, as shown in FIG. 12B, when the inclination angle θ of the surface of the second recess 21 is large and the inclination angle θ> θc, the light 500 emitted upward from the light emitting element 12 is At a larger rate, the light 501 is totally reflected by the slope of the second concave portion and travels upward in the resin sealing layer 15 from the upper side toward the longitudinal direction. Thereby, since the distribution of the light emitted from the second concave portion can be diffused in the longitudinal direction, the uniformity of the light emission intensity of the linear light source device 11 can be improved, and the luminance unevenness and color unevenness can be further increased. Can be suppressed. Therefore, it is preferable that the inclination angle θ of the surface of the second recess of the linear light source device according to the present embodiment is steeper than the critical angle θc of total reflection.

(4-3. About the first recess 20)
Next, the principle of efficiently extracting the light traveling in the longitudinal direction in the resin sealing layer 15 from the first recess 20 will be described with reference to FIGS. FIG. 13 is a schematic diagram showing a trajectory of light traveling from the second recess 21 to the longitudinal direction side in the linear light source device 11 according to the present embodiment.

  FIG. 13A is a schematic diagram showing a trajectory in the vicinity of the first concave portion 20, and FIG. 13B is a schematic diagram showing a trajectory when the first concave portion 20 is not present, which is a comparative example of FIG. And (c) is a schematic diagram showing a case where light 602 having a small inclination α (i) traveling in the longitudinal direction side is not totally reflected by the first concave portion 20, and (d) is a diagram in the longitudinal direction side. FIG. 6 is a schematic diagram showing a case where light 605 having a small inclination α (i) traveling toward the center is totally reflected by the first recess 20.

  As shown in FIG. 13B, in the present embodiment, an intermediate region between two adjacent light emitting elements 12 (near the middle between the two second recesses 21), which is a region far from the light emitting element 12 and whose luminance tends to be low. In addition, as shown in FIG. 13A, when the first recess 20 is present, the light 600 guided in the longitudinal direction can be efficiently extracted as the light 601.

  On the other hand, as shown in FIG. 13C, when the inclination α (i) with respect to the longitudinal direction of the path of light traveling in the longitudinal direction is small, the light 602 is emitted from one side surface of the first recess 20; Light 603 is incident on the other side surface of the first recess 20 and becomes light 604.

  Therefore, as shown in FIG. 13D, by reducing the inclination angle θ (i), the light 605 is totally reflected on the side surface of the first recess 20, becomes light 606, and is reflected by the reflecting plate 16. Thus, the path of light traveling in the longitudinal direction becomes light 607 having a large inclination with respect to the longitudinal direction, and is emitted from the side surface of the first recess 20.

  That is, it is more preferable that the inclination angle θ (i) of the side surface of the groove having the V-shaped cross section of the first recess 20 is smaller than the critical angle θc of total reflection.

  By doing so, among the light traveling on the longitudinal direction side, the light traveling on the longitudinal direction side with less inclination can be totally reflected, so that the re-incident can be prevented. As a result, the light traveling in the longitudinal direction can be efficiently extracted from the first recess 20.

[Embodiment 2]
Next, another embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the structure which has the function similar to the structure demonstrated in the said embodiment, and the description is abbreviate | omitted.

(1. Basic configuration of the linear light source device 111)
FIG. 14 is a perspective view of the linear light source device 111 according to the second embodiment. FIG. 15 is a cross-sectional view of the linear light source device 111 taken along the longitudinal direction. FIG. 16 is a plan view of the linear light source device 111. FIG. 17 is a cross-sectional view of the linear light source device 111 taken along the width direction.

  As shown in FIG. 14, the linear light source device 111 according to the second embodiment is different from the linear light source device 11 according to the first embodiment in the structure of the reflection plate 116 and the other configurations are the same.

  The periphery of the light emitting element 12 is surrounded by a reflecting plate 116, and the side surface of the reflecting plate 116 on the side facing the light emitting element 12 is inclined so that the opening area becomes larger toward the emission direction of each light emitting element 12. The lower layer side surface 131 and the vicinity of the opening are formed by an upper layer side surface 132 having a rectangular recess shape formed by the lower layer side surface 131.

  As shown in FIGS. 15 and 17, the upper layer side surface 132 is formed only on the longitudinal direction side. The upper layer side surface 132 is formed in a step shape. That is, the upper layer side surface 132 has an angular columnar recess shape having a bottom surface wider than the opening surface of the recess formed by the lower layer side surface 131, and the side surface has no inclination. The opening surface of the recess formed by the lower layer side surface 131 has a form included in the bottom frame of the columnar upper layer side surface 132.

  The reflection plate 116 has a shape in which a one-step recess is formed by the lower layer side surface 131 and the upper layer side surface 132, and the resin sealing portion 14 is formed up to the upper end of the upper layer side surface 132. That is, as shown in FIG. 17, a part of the resin sealing portion 14 is bonded to the first reflection sheet 17 and the second reflection sheet 18 in the width direction of the substrate 13.

(2. Manufacturing method of linear light source device 111)
In the second embodiment, in the step of forming the reflecting plate, the reflecting plate 116 having a shape as shown in FIG. 18 is formed on the printed board 40. FIG. 18 is a perspective view of a printed board material on which a resin sealing layer according to this embodiment is formed.

  As shown in FIG. 18, the reflector 116 formed on the printed board 40 has a shape with a one-step recess. By setting it as such a shape, the resin which forms the resin sealing part 14 can be continuously apply | coated (pour) into the several concave part which the reflecting plate 116 makes.

  That is, the resin can be applied (filled) linearly in the Y-axis direction (width direction of the substrate 13) in FIG. Therefore, the complicated resin coating operation for forming the resin sealing portion 14 can be eliminated, and the coating time can be reduced.

  Moreover, the uniformity of resin which comprises a resin sealing part with different linear light source devices can be improved, and a highly reliable linear light source device can be provided. The other steps are the same as those in the first embodiment.

  Note that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

  By replacing the linear light source devices 11 and 111 of the present invention described above with the linear light source 410 described in the prior art, a planar light source with small luminance unevenness and low light loss (low power consumption). An apparatus can be provided.

  As described above, in the linear light source device according to the present invention, the light emitted from the light emitting element in the width direction of the substrate is first reflected by the reflecting member and then emitted from the sealing member. Therefore, it can be applied to a light source of an arbitrary display device having a backlight, and is particularly suitable for a light source of a display device such as a mobile phone, a digital camera, or a portable game machine.

11, 111 Linear light source device 12 Light emitting element 13 Substrate 14 Resin sealing part (fluorescent part)
15 Resin sealing layer (sealing member)
16, 116 Reflector (reflective member)
17 1st reflection sheet 18 2nd reflection sheet 20 1st recessed part 21 2nd recessed part 51a, b External connection terminal 52a, b External connection terminal 40 Printed board material (plate material)
61 surface light emitting device 62 light guide plate

Claims (13)

A linear light source device that emits linear light from a plurality of light emitting elements arranged in a longitudinal direction on an elongated substrate,
A reflection member that reflects light from the light emitting element is provided at the end in the width direction of the upper surface of the substrate so as to face the light emitting element.
A linear light source device, wherein a translucent sealing member that seals the light emitting element is provided on the substrate, the light emitting element, and the reflecting member.   The linear light source device according to claim 1, wherein the reflection member is provided in a region surrounding the light emitting element on the upper surface of the substrate.   3. The linear shape according to claim 2, wherein the region surrounding the plurality of light emitting elements is a region between the adjacent light emitting elements in addition to the region of the end portion in the width direction of the upper surface of the substrate. Light source device.   The reflecting member is formed in a region at an end portion in the width direction of the upper surface of the substrate, rather than a reflecting member formed in a region between the adjacent light emitting elements in a thickness in a direction perpendicular to the upper surface of the substrate. The linear light source device according to claim 3, wherein the reflecting member is thinner.   5. The linear shape according to claim 1, wherein the reflecting member is inclined so as to reflect light directly reaching the light emitting element in a normal direction of the substrate. Light source device. The sealing member is
A first recess provided between the light emitting elements adjacent to each other and bending the light guided in the sealing member to guide part or all of the light to the outside;
And a second recess that bends light emitted from the light emitting element in a normal direction on the upper surface of the substrate and guides part or all of the light into the sealing member. Item 6. The linear light source device according to any one of Items 1 to 5.   The linear light source device according to claim 6, wherein the first concave portion of the sealing member totally reflects light guided in the longitudinal direction in the sealing member.   The linear light source device according to claim 6, wherein the second concave portion of the sealing member totally reflects light irradiated from the light emitting element in a normal direction of the upper surface of the substrate.   The linear light source device according to any one of claims 1 to 8, wherein an external connection terminal that supplies electricity to the plurality of light emitting elements is provided at an end portion in a longitudinal direction of the substrate.   The linear light source device according to claim 1, wherein the sealing member includes a phosphor and includes a fluorescent portion that covers each of the light emitting elements.   The end surface of the light emitting side of the light emitting element, the side surface in the longitudinal direction is inclined with respect to the thickness direction of the substrate. Linear light source device. The linear light source device according to any one of claims 1 to 11,
A surface light emitting device comprising: a light guide plate for emitting light linearly incident from the linear light source device as planar light.   A liquid crystal display device that outputs a display by comprising the surface light emitting device according to claim 12 and a liquid crystal display panel that modulates light from the surface light emitting device.

Images