JP2016085797A - Surface light emitting module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface light emitting module which can make a non-light emitting region inconspicuous.SOLUTION: A surface light emitting module includes: a surface light source 10 having a light emitting surface 10S; and a prism sheet 20 which has an incident surface 21 and an emission surface 22, in which an irregular pattern 23 is formed on the incident surface, and which is arranged so that the irregular pattern faces the light emitting surface. The light emitting surface includes a light emitting region RA and a non-light emitting region RB. The light emitting region has luminance distribution in which, compared to front luminance in a central part out of the light emitting region, the front luminance of a first outside part located in a first direction X1 when viewed from the central part out of the light emitting region becomes higher. Light which has entered the prism sheet 20 by radiating to the further first direction X1 side than a normal direction of the light emitting region RA from the light emitting region RA is deflected, by the irregular pattern 23, so that it spreads to the first direction X1 side compared to the light before entering the prism sheet 20.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a surface emitting module including a surface light source.

  Unlike a point light source such as an incandescent lamp and LED, and a linear light source such as a fluorescent lamp, the surface light source emits substantially the entire light emitting surface of the surface light source. A surface emitting module including such a surface light source is not limited to the illumination field, and is also used as a backlight of various devices such as a liquid crystal television, a computer monitor, or an outdoor advertisement. An organic EL is known as an example of the surface light source. The organic EL is a thin surface light source and has flexibility, and thus is expected as a new light source for illumination.

  In a surface light source such as an organic EL, sealing is generally performed around the light emitting portion in order to protect the light emitting portion (light emitting layer or light emitting element) from moisture and oxygen. Since the sealing part is provided so as to cover the light emitting part, the sealing part has a larger area than the light emitting part. For this reason, not only a light emitting region that actually emits light but also a non-light emitting region that emits little or no light is formed on the surface of the surface light source that emits light (light emitting surface).

  The sealing portion also has a function of protecting the light emitting portion when manufacturing the surface light source. When manufacturing a surface light source, cracks and the like are likely to occur at the end of the surface light source. The sealing part also suppresses the occurrence of cracks and the like. Due to these necessity of protecting the light emitting portion, it is difficult to completely eliminate the sealing portion from the periphery of the light emitting portion, and a non-light emitting region having a certain width is formed around the light emitting region.

  By rotating the light emitted from the light emitting region to the non-light emitting region, a pseudo visual effect is obtained as if light is emitted from the non-light emitting region, and the presence of the non-light emitting region is less noticeable. As disclosed in Patent Documents 1 and 2 below, a technique for adjusting light distribution by using a prism sheet is known. The prism sheet is a sheet-like optical element that improves the luminance in a specific direction by utilizing the action of light refraction, and is also referred to as a lens sheet or BEF (Brightness Enhancement Film).

JP 2010-262827 A JP 2006-059542 A

  SUMMARY OF THE INVENTION An object of the present invention is to make a non-light emitting region less noticeable than in the conventional surface emitting module including a surface light source and a prism sheet.

  A surface light emitting module according to the present invention has a surface light source having a light emitting surface, an incident surface and an output surface, and a concave / convex pattern is formed on the incident surface, and the concave / convex pattern is arranged to face the light emitting surface. The light emitting surface includes a light emitting region and a non-light emitting region formed around the light emitting region, and the light emitting region has a front luminance at a central portion of the light emitting region. In comparison, the light emitting region has a luminance distribution in which the front luminance of the first outer portion located in the first direction when viewed from the central portion is higher, and the normal direction of the light emitting region from the light emitting region. The light that is radiated to the prism sheet and is incident on the prism sheet is deflected by the concave / convex pattern so as to spread more on the first direction side than before entering the prism sheet. Yes.

  Preferably, a first boundary line that is located in the first direction as viewed from the first outer portion and that partitions the first outer portion and the non-light-emitting region intersects the first direction. The concave and convex pattern of the prism sheet has a plurality of inclined surfaces, and each of the plurality of inclined surfaces is substantially with respect to the first boundary line. It is formed so as to extend along the parallel direction and to line up in order along the first direction.

  Preferably, the surface light source is composed of an organic EL that feeds power to the light emitting layer through a transparent electrode, and a portion of the transparent electrode located outside the light emitting region is substantially parallel to the first boundary line. Auxiliary electrodes extending along various directions are provided.

  Preferably, the surface light source is composed of an organic EL that feeds power to the light emitting layer through a transparent electrode, and the portions of the transparent electrode that are located on both outer sides of the light emitting region are substantially the same as the first boundary line. Two auxiliary electrodes extending in parallel directions are provided, respectively, and a direction opposite to the first direction is defined as a second direction, and the second direction is viewed from the central portion of the light emitting region. When the portion located is the second outer portion, the second boundary line that is located in the second direction as viewed from the second outer portion and that partitions the second outer portion and the non-light emitting region is The light emitting region extends along a direction substantially parallel to the first boundary line, and the light emitting region has the first luminance in the light emitting region as compared to the front luminance of the central portion in the light emitting region. A luminance distribution in which the front luminance of the outer portion and the second outer portion is higher. Then, the light emitted from the light emitting region to the second direction side with respect to the normal direction of the light emitting region and incident on the prism sheet is more than the light incident on the prism sheet by the concave / convex pattern. It is deflected so as to spread toward the second direction.

Preferably, a light diffusing portion is provided on the emission surface of the prism sheet.
Preferably, another light diffusion portion is provided on the light emitting surface of the surface light source.

  Preferably, the concavo-convex pattern of the prism sheet includes a plurality of unit prism portions arranged in a matrix direction, and each of the plurality of unit prism portions has a conical or frustum shape, and has a surface. The above inclined surface is formed.

  Preferably, the surface light source includes an organic EL that feeds power to the light emitting layer through a transparent electrode, and includes the first boundary line when a portion located on the outer periphery of the central portion of the light emitting region is an outer peripheral portion. The boundary line that divides the outer peripheral portion and the non-light-emitting region has a rectangular shape, and the portion of the transparent electrode that is positioned on the outer periphery of the light-emitting region has a boundary line. Four auxiliary electrodes extending along a direction substantially parallel to the four sides are provided, respectively, and the light emitting region is more than the front luminance of the central portion of the light emitting region. The outer peripheral portion located on the outer periphery of the central portion has a luminance distribution in which the front luminance is higher and radiates from the light emitting region so as to spread obliquely outward with respect to the normal direction of the light emitting region. Light incident on the prism sheet , By the uneven pattern is deflected so as to spread more the obliquely outward than before entering the said prism sheet.

  Preferably, the plurality of surface light sources are arranged to face one prism sheet.

  Preferably, the surface light source and the prism sheet have flexibility.

  According to said structure, in a surface emitting module provided with the surface light source and the prism sheet, it becomes possible to make a non-light-emitting area less conspicuous compared with the past.

It is a bottom view which shows the surface emitting module in Embodiment 1, and is equivalent to the surface emitting module seen from the arrow I direction in FIG. It is arrow sectional drawing along the II-II line | wire in FIG. It is sectional drawing which shows the surface light source with which the surface emitting module in Embodiment 1 is equipped. It is a top view which shows the surface light source with which the surface emitting module in Embodiment 1 is equipped, and is equivalent to the surface light source seen from the arrow IV direction in FIG. It is a bottom view which shows the surface light source with which the surface emitting module in Embodiment 1 is equipped, and is equivalent to the surface light source seen from the arrow V direction in FIG. It is a graph showing the front luminance of the light radiated | emitted from the part in the position where the arrow X is drawn using the dashed-two dotted line among the light emission areas shown in FIG. It is a bottom view which shows a mode that the surface emitting module in Embodiment 1 is light-emitting, and is equivalent to the surface emitting module seen from the arrow VII direction in FIG. It is arrow sectional drawing along the VIII-VIII line in FIG. It is sectional drawing which shows the surface emitting module in Embodiment 2. FIG. It is sectional drawing which shows the surface emitting module in Embodiment 3. It is a figure which shows the simulation model of the surface emitting module used for the experiment example (Example). It is a graph which shows the relationship (luminance profile) of a light source width and relative brightness | luminance as a simulation result by Comparative Examples 1-3 and an Example. It is the figure which showed the position where brightness | luminance becomes 50% compared with the center part as a simulation result by the comparative example a, comparative examples 1-3, and an Example. It is sectional drawing which shows the surface light source with which the surface emitting module in Embodiment 4 is equipped. It is a top view which shows the surface light source with which the surface emitting module in Embodiment 4 is provided, and is equivalent to the surface light source seen from the arrow XV direction in FIG. It is a graph showing the front luminance of the light radiated | emitted from the surface light source with which the surface emitting module in Embodiment 4 is equipped (it represents the front luminance of the light radiated | emitted from the part in the same position as FIG. 6). It is sectional drawing which shows the surface light source with which the surface emitting module in Embodiment 5 is equipped. It is a top view which shows the surface light source with which the surface emitting module in Embodiment 5 is provided, and is equivalent to the surface light source seen from the arrow XVIII direction in FIG. FIG. 18 is a bottom view showing a surface light source provided in the surface light emitting module according to Embodiment 5, and corresponds to a surface light source viewed from the direction of arrow XIX in FIG. It is a perspective view which shows the prism sheet with which the surface emitting module in the modification of Embodiment 5 is equipped. It is sectional drawing which shows the surface emitting module in Embodiment 6.

  Hereinafter, embodiments will be described with reference to the drawings. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
(Surface emitting module 100)
With reference to FIGS. 1-8, the surface emitting module 100 in Embodiment 1 is demonstrated. FIG. 1 is a bottom view showing the surface emitting module 100 and corresponds to the surface emitting module 100 viewed from the direction of arrow I in FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. As shown in FIGS. 1 and 2, the surface emitting module 100 includes a surface light source 10 (FIG. 2) and a prism sheet 20. Hereinafter, the surface light source 10 and the prism sheet 20 will be described in detail in order.

(Surface light source 10)
FIG. 3 is a cross-sectional view showing the surface light source 10. FIG. 4 is a plan view showing the surface light source 10 and corresponds to the surface light source 10 viewed from the direction of arrow IV in FIG. FIG. 5 is a bottom view showing the surface light source 10 and corresponds to the surface light source 10 viewed from the direction of arrow V in FIG. For convenience, the surface light source 10 is schematically illustrated in FIG.

  As shown in FIGS. 2 to 5 (mainly FIG. 3), the surface light source 10 includes a transparent substrate 11, an anode 12, a light emitting layer 13, a cathode 14, a sealing member 15, and an insulating layer 16. The transparent substrate 11 is made of glass, thin film glass, resin film, or the like.

  The transparent substrate 11 is a member that forms the light emitting surface 10 </ b> S of the surface light source 10. When the transparent substrate 11 is manufactured using a flexible material such as a thin film glass or a resin film, the surface light source 10 has flexibility, and the entire surface light source 10 can be curved. The flexibility of the surface light source 10 improves the degree of freedom of installation of the surface light source 10.

  The anode 12 (not shown in FIG. 2) is a conductive film having transparency. The anode 12 is formed, for example, by depositing ITO on the transparent substrate 11. A part of the ITO film for forming the anode 12 forms an electrode extraction portion 17 (for anode) and is exposed from the sealing member 15 for electrical connection. In the present embodiment, the electrode extraction portion 17 is provided at two locations (see FIGS. 3 and 4), and one electrode extraction portion 17 is located in the direction of the arrow X1 when viewed from the light emitting layer 13, and the other The electrode extraction part 17 is located in the direction of the arrow X2 when viewed from the light emitting layer 13.

  The light emitting layer 13 generates light when supplied with electric power. The light emitting layer 13 is configured by laminating a single layer or a plurality of layers. The cathode 14 (not shown in FIG. 2) is, for example, aluminum (AL), and is formed so as to cover the light emitting layer 13. A part of aluminum for forming the cathode 14 (FIG. 3) forms the electrode extraction part 18 (for cathode) shown in FIG. 4 and is exposed from the sealing member 15 for electrical connection. Yes. The electrode extraction part 18 of the present embodiment is located in a direction orthogonal to the directions of the arrows X1 and X2 when viewed from the light emitting layer 13 (see FIG. 3). The insulating layer 16 (see FIG. 3) is provided between the cathode 14 and the anode 12.

  The sealing member 15 is comprised from glass, thin film glass, or a resin film. The sealing member 15 seals substantially the whole of the anode 12, the light emitting layer 13, and the cathode 14 on the transparent substrate 11. The electrode extraction parts 17 and 18 are exposed from the sealing member 15 for electrical connection. The electrode extraction parts 17 and 18 are electrically connected to an external power source through the wiring members 41 to 43 (see FIG. 4).

  In the surface light source 10, an auxiliary electrode 17 a is provided in a portion of the anode 12 (transparent electrode) located outside the light emitting region RA (a portion of the electrode extraction portion 17 exposed on the left side in FIG. 4). It has been. Further, an auxiliary electrode 17b is provided in a portion of the anode 12 (transparent electrode) located outside the light emitting region RA (a portion of the electrode extraction portion 17 exposed on the right side in FIG. 4).

  In general, ITO or the like that constitutes a transparent electrode has a high electric resistance, and thus is more susceptible to a voltage drop as the distance from a feeding point (for example, a point where the wiring member 41 shown in FIG. 4 is provided) is increased. If the auxiliary electrode is not provided, the luminance decreases concentrically as the distance from the feeding point increases.

  On the other hand, since the auxiliary electrode 17a has a sufficiently low electric resistance compared to the transparent electrode, the potential difference generated in the auxiliary electrode 17a is extremely small. When the auxiliary electrode 17a is provided in the electrode extraction part 17, even if it is away from the point (feeding point) where the wiring member 41 shown in FIG. 4 is provided, there is almost no influence of the voltage drop. The same applies to the auxiliary electrode 17b.

(Light emitting area RA and non-light emitting area RB)
Referring to FIGS. 3 and 4, in surface light source 10 configured as described above, wiring members 41 to 43, auxiliary electrodes 17a and 17b, electrode extraction portions 17 and 18, anode 12 (transparent electrode), and cathode Power is supplied to the light emitting layer 13 through 14. Light is generated in the light emitting layer 13, and a part of the light passes through the anode 12 as it is and is extracted from the light emitting surface 10 </ b> S, and another part of the light is reflected by the cathode 14 and then passes through the anode 12. It is taken out from the light emitting surface 10S.

  In the surface light source 10, a part of the light emitting surface 10S (light emitting region RA) emits light (see the white arrow in FIG. 3). The light emitting surface 10S of the surface light source 10 includes a light emitting region RA (FIGS. 3 and 5) and a non-light emitting region RB, and the light emitting region RA mainly emits light. The non-light emitting region RB (see FIG. 5) formed around the light emitting region RA emits little or no light. In the present embodiment, the non-light emitting region RB is formed so as to surround the light emitting region RA by providing the sealing member 15 and the electrode extraction portions 17 and 18 in the surface light source 10.

  Referring to FIG. 5, light emitting area RA and non-light emitting area RB are partitioned by a boundary line indicated by a one-dot chain line in FIG. This boundary line has a rectangular shape with the points P1, P2, Q1, and Q2 as four vertices. The light emitting region RA is located inside the boundary line, and the non-light emission is outside the boundary line. Region RB is located.

  As shown in FIG. 5, the light emitting region RA has a rectangular shape. The light emitting region RA of the present embodiment includes a central portion RC, a first outer portion R1, and a second outer portion R2, all of which have a substantially rectangular shape. The central portion RC is located at the center of the light emitting region RA in the arrow X direction shown in FIG. The first outer portion R1 and the second outer portion R2 are located on both outer sides of the central portion RC in the direction of the arrow X shown in FIG. The central portion RC, the first outer portion R1, and the second outer portion R2 can be divided according to the width dimension.

  The direction of the arrow X can be defined as an arbitrary direction, but the direction of the arrow X in the present embodiment refers to two long sides of the light emitting region RA (a first boundary line BL1 and a second boundary described later). The direction is orthogonal to the line BL2. Here, a direction parallel to the arrow X and opposite to the direction indicated by the arrow X is defined as a first direction (direction indicated by the arrow X1), and is parallel to the arrow X and indicated by the arrow X. The direction that is the same as the direction shown is defined as the second direction (the direction indicated by the arrow X2).

  The definitions of the arrows X1 and X2 are common to FIGS. 1 to 5 and all the drawings mentioned in the following description. The first outer portion R1 of the light emitting region RA is located in the first direction (the direction indicated by the arrow X1) when viewed from the central portion RC, and the second outer portion R2 of the light emitting region RA is the central portion. It is located in the 2nd direction (direction shown by arrow X2) seeing from RC.

  Of the boundary lines that divide the light-emitting area RA and the non-light-emitting area RB, the boundary line is located in the first direction X1 when viewed from the first outer part R1, and the first outer part R1 and the non-light-emitting area RB are divided. The first boundary line BL1 has a linear shape extending along a direction that intersects (is orthogonal to the present embodiment) with respect to the first direction X1.

  Of the boundary lines that divide the light emitting region RA and the non-light emitting region RB, the second outer portion R2 is located in the second direction X2 when viewed from the second outer portion R2, and the second outer portion R2 and the non-light emitting region RB are divided. The second boundary line BL2 has a linear shape that extends along a direction that intersects (is orthogonal to in the present embodiment) the first direction X1. In the present embodiment, the first boundary line BL1 and the second boundary line BL2 are substantially parallel.

  4 and 5, in the present embodiment, auxiliary electrode 17a extends along a direction substantially parallel to first boundary line BL1, and auxiliary electrode 17b is the second It extends along a direction substantially parallel to the boundary line BL2. The auxiliary electrode 17a provided outside the first boundary line BL1 and the auxiliary electrode 17b provided outside the second boundary line BL2 are substantially parallel.

  FIG. 6 is a graph showing the front luminance N1 of the light emitted from the portion in the position where the arrow X is drawn using the two-dot chain line in the light emitting region RA shown in FIG. In the present embodiment, the light emitting region RA has a first outer portion R1 located in the first direction X1 when viewed from the central portion RC of the light emitting region RA, as compared to the front luminance of the central portion RC of the light emitting region RA. Has a luminance distribution with higher front luminance. Further, the light emitting region RA is compared with the front luminance of the central portion RC in the light emitting region RA, and the front luminance of the second outer portion R2 located in the second direction X2 when viewed from the central portion RC of the light emitting region RA. Has a higher luminance distribution.

  The front luminance N1 has a symmetrical shape in the directions of the arrows X1 and X2. Of the light emitting surface 10S of the surface light source 10, the front luminance of light in the directions of the arrows X1 and X2 is the front luminance shown in FIG. 6 regardless of the position of the front luminance in the direction orthogonal to the arrows X1 and X2. Appears approximately the same as N1. Such a luminance distribution can be easily realized by using the auxiliary electrodes 17a and 17b.

(Prism sheet 20)
Referring again to FIGS. 1 and 2, the prism sheet 20 (also referred to as BEF) is a sheet-like optical element having an incident surface 21 and an output surface 22. The prism sheet 20 has optical transparency and is made of, for example, resin. The thickness of the prism sheet 20 is, for example, 3.0 mm, and an uneven pattern 23 is formed on the incident surface 21. The emission surface 22 has a flat surface shape.

  The prism sheet 20 is disposed such that the incident surface 21 (uneven pattern 23) faces the light emitting surface 10S of the surface light source 10. In FIG. 1, a state seen from the emission surface 22 side of the boundary line that divides the light emitting region RA and the non-light emitting region RB of the surface light source 10 is transparently illustrated using a one-dot chain line. As described above, the boundary lines referred to here include the first boundary line BL1 and the second boundary line BL2.

  The prism sheet 20 has at least a size that can cover the entire light emitting region RA, and the prism sheet 20 of the present embodiment is provided so as to cover the entire light emitting surface 10S. . The prism sheet 20 may be manufactured using a flexible material. The prism sheet 20 has flexibility, and the entire prism sheet 20 can be curved. The flexibility of the prism sheet 20 improves the degree of freedom of installation of the prism sheet 20.

  The concave / convex pattern 23 provided on the incident surface 21 includes a plurality of unit prism portions 24. As shown in FIG. 1, when the prism sheet 20 is viewed in plan, each (one by one) of the unit prism portions 24 intersects the directions of the arrows X1 and X2 (in the present embodiment, they are orthogonal). A shape extending linearly along the direction is formed.

  Each of the unit prism portions 24 includes a valley portion 25, an inclined surface 26, a mountain portion 27, and an inclined surface 28, and the cross-sectional shape is a triangle. In FIG. 1, a state seen from the exit surface 22 side of the valley portion 25 and the mountain portion 27 is transparently illustrated using a dotted line (broken line). In the present embodiment, each of the plurality of inclined surfaces 26, 28 extends along a direction substantially parallel to the first boundary line BL 1 in the surface light source 10, and the first direction (or the arrow X 1) (or They are arranged in order along the second direction indicated by the arrow X2.

(Function and effect)
FIG. 7 is a bottom view showing how the surface light emitting module 100 emits light, and corresponds to the surface light emitting module 100 viewed from the direction of arrow VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. As described above, in the surface light emitting module 100, the surface of the prism sheet 20 on which the concave and convex pattern 23 (the plurality of inclined surfaces 26 and 28) is formed functions as the incident surface 21, and the surface light source 10 emits light. It arrange | positions so that the surface 10S may be opposed.

  With reference to FIG. 7 and FIG. 8, the light emitted from the light emitting region RA of the surface light source 10 enters the prism sheet 20 from the incident surface 21. At this time, the uneven pattern 23 of the prism sheet 20 refracts light incident on the prism sheet 20. The light incident on the prism sheet 20 travels so as to spread due to the action of refraction.

  The light that radiates from the light emitting area RA toward the first direction X1 with respect to the normal direction of the light emitting area RA and enters the prism sheet 20 is more incident on the prism sheet 20 than the light incident on the prism sheet 20 by the uneven pattern 23. It is deflected so as to spread toward the one direction X1 (see arrow D1 shown in FIGS. 7 and 8). Similarly, the light emitted from the light emitting area RA to the side of the second direction X2 with respect to the normal direction of the light emitting area RA and incident on the prism sheet 20 is compared with that before entering the prism sheet 20 due to the uneven pattern 23. Thus, it is deflected so as to spread toward the second direction X2 (see arrow D2 shown in FIGS. 7 and 8).

  If the prism sheet 20 is not arranged so as to face the light emitting surface 10S of the surface light source 10, the degree of light spreading is limited to the range between the line RA1a and the line RA1b shown in FIG. Become. The spread of light here is the spread of light at the position of the emission surface 22 when the prism sheet 20 is disposed to face the light emitting surface 10S of the surface light source 10.

  On the other hand, in the present embodiment, the concavo-convex pattern 23 of the prism sheet 20 faces the light emitting surface 10S of the surface light source 10, and each of the plurality of inclined surfaces 26 and 28 provided on the prism sheet 20 is It extends along a direction substantially parallel to the first boundary line BL1 and the second boundary line BL2. The degree of spread of light at the position of the emission surface 22 is expanded to a range surrounded by a line RA2 shown in FIG.

  On the emission surface 22 of the prism sheet 20, the light emitting area is larger than the light emitting area RA, and a wider light emission range can be obtained as compared with the case where the surface light source 10 is used alone. In other words, the light emitted from the light emitting region RA of the surface light source 10 is refracted by the prism sheet 20 and travels to a portion corresponding to the non-light emitting region RB in the emission surface 22 of the prism sheet 20. Radiated from there. When the surface light emitting module 100 is viewed from the front, a pseudo visual effect is obtained as if light is emitted from the non-light emitting region RB, and the presence of the non-light emitting region RB becomes inconspicuous.

  In the present embodiment, the inclined surface 26 of the prism sheet 20 with respect to the first boundary line BL1 located between the first outer portion R1 (FIG. 5) of the light emitting region RA and the non-light emitting region RB, 28 are arranged so as to extend substantially in parallel. According to this configuration, the light emitted from the first outer portion R1 and the vicinity thereof can be efficiently advanced toward the non-light emitting region RB (in the direction of the arrow D1 shown in FIGS. 7 and 8). .

  Similarly, the inclined surfaces 26 and 28 of the prism sheet 20 are substantially the same with respect to the second boundary line BL2 located between the second outer portion R2 (FIG. 5) of the light emitting region RA and the non-light emitting region RB. It arrange | positions so that it may extend in parallel. According to this configuration, the light emitted from the second outer portion R2 and the vicinity thereof can be efficiently advanced toward the non-light emitting region RB (in the direction of the arrow D2 shown in FIGS. 7 and 8). .

  In addition, since the inclined surfaces 26 and 28 of the prism sheet 20 extend substantially parallel to the first boundary line BL1 and the second boundary line BL2, the first boundary line BL1 and the second boundary line BL2 Along with this, the light emitting region can be expanded uniformly. Whereas the light emitting surface 10S of the surface light source 10 has a rectangular light emitting area RA, the light emitting area on the emission surface 22 is also rectangular without any extreme change from the shape of the light emitting area RA. be able to.

  As described above with reference to FIG. 5 and FIG. 6, the light emitting area RA of the present embodiment has a first outer portion R <b> 1 in the light emitting area RA as compared to the front luminance of the central area RC in the light emitting area RA. (FIG. 5) has a luminance distribution in which the front luminance is higher. According to the said structure, the light radiated | emitted from 1st outer side part R1 which has high brightness | luminance compared with center part RC is 1st seeing from light emission area | region RA (1st outer side part R1) of non-light-emitting area | region RB. This contributes to improving the luminance of the portion located in the direction (arrow X1 direction). On the other hand, the luminance of the portion corresponding to the first outer portion R1 in the emission surface 22 decreases. Therefore, of the exit surface 22 of the prism sheet 20, the portion corresponding to the central portion RC, the portion corresponding to the first outer portion R1, and the first direction (arrow X1 direction) as viewed from the first outer portion R1. Therefore, it is possible to reduce the variation in luminance with the portion to be performed.

  Similarly, in the light emitting region RA of the present embodiment, the front luminance of the second outer portion R2 (FIG. 5) of the light emitting region RA is more than the front luminance of the central portion RC of the light emitting region RA. It has a luminance distribution that increases. According to the said structure, the light radiated | emitted from 2nd outer side part R2 which has a high brightness | luminance compared with center part RC is 2nd seeing from light emission area | region RA (2nd outer side part R2) of non-light-emitting area | region RB. This contributes to improving the luminance of the portion located in the direction (arrow X1 direction). On the other hand, the luminance of the portion corresponding to the second outer portion R2 in the emission surface 22 decreases. Therefore, of the emission surface 22 of the prism sheet 20, the portion corresponding to the central portion RC, the portion corresponding to the second outer portion R2, and the second direction (arrow X2 direction) as viewed from the second outer portion R2. Therefore, it is possible to reduce the variation in luminance with the portion to be performed.

  According to the surface light emitting module 100, a pseudo visual effect as if light is emitted from the non-light emitting region RB is obtained, and an effect that the presence of the non-light emitting region RB is not conspicuous is obtained. It is also possible to reduce variation in luminance of light emitted from the light emitting region surrounded by the line RA2 shown in FIG.

[Embodiment 2]
With reference to FIG. 9, the surface emitting module 101 in Embodiment 2 is demonstrated. Here, differences between the second embodiment and the first embodiment will be described. FIG. 9 is a cross-sectional view showing the surface emitting module 101 and corresponds to FIGS. 2 and 8 in the first embodiment. In the surface light emitting module 101, a light diffusion portion 31 is provided on the emission surface 22 of the prism sheet 20.

  The light diffusing unit 31 diffuses light by using an internal scattering action by containing fine particles inside, or diffuses light by using an interface reflection action or an interface refraction action by having irregularities on the surface of the member. Things can be used. The light diffusing unit 31 may be a part (for example, a diffusion sheet) that is manufactured separately from the prism sheet 20 and then joined to the prism sheet 20, or is integrated with the prism sheet 20 as a part of the prism sheet 20. It may be a part (a part that can be formed by a roughening process) that has been manufactured.

  The light that travels inside the prism sheet 20 is diffused when passing through the light diffusing unit 31, so that the light diffusing unit 31 appears to emit light, and the light source appears to be further spread. An effect is obtained. In addition, due to the light diffusion effect of the light diffusion portion 31, luminance unevenness can be reduced.

[Embodiment 3]
With reference to FIG. 10, the surface emitting module 102 in Embodiment 3 is demonstrated. Here, differences between the third embodiment and the first embodiment will be described. FIG. 10 is a cross-sectional view showing the surface emitting module 102, and corresponds to FIGS. 2 and 8 in the first embodiment. In the surface light emitting module 102, the light diffusing unit 32 is provided on the light emitting surface 10 </ b> S of the surface light source 10.

  The light diffusing unit 32 diffuses light by using an internal scattering action by containing fine particles inside, or diffuses light by using an interface reflection action or an interface refraction action by having irregularities on the surface of the member. Things can be used. The light diffusing unit 32 may be a part (for example, a diffusion sheet) that is manufactured separately from the transparent substrate 11 of the surface light source 10 and then joined to the transparent substrate 11, or is transparent as a part of the transparent substrate 11. It may be a portion (a portion that can be formed by roughening) that is manufactured integrally with the substrate 11.

  The light diffusion unit 32 diffuses light passing through the light diffusion unit 32. When comparing the light before passing through the light diffusing unit 32 and the light after passing through the light diffusing unit 32, the light distribution characteristics of the light after passing through the light diffusing unit 32 are different for each angle of the light distribution characteristics. It changes so that the light quantity difference of becomes small. Since the light distribution characteristic of the light that has passed through the light diffusing unit 32 approaches a Lambertian distribution, the wavelength dependency of the light distribution becomes small. Therefore, when light is emitted from the exit surface 22 of the prism sheet 20, it is possible to suppress the occurrence of a color shift (a light distribution difference) due to the enlargement of the light source (light emitting region). Become.

  In addition, most of the light generated in the light emitting layer 13 enters the light diffusion portion 32 after passing through the inside of the transparent substrate 11. The light diffusion part 32 can also exhibit a so-called light extraction effect of extracting a light component that is not emitted from the transparent substrate 11. By providing the light diffusing unit 32, the light extraction efficiency is improved, and as a result, the light emission efficiency of the surface light emitting module 100 is improved. The configuration in the third embodiment (the configuration in which the light diffusing unit 32 is provided on the light emitting surface 10S of the surface light source 10) can be implemented in combination with the above-described second embodiment.

[Experimental example]
With reference to FIG. 11 to FIG. 13, an example of an experiment performed on the above-described second embodiment (see FIG. 9) will be described. The experimental example includes an example based on the above-described second embodiment, and comparative examples 1 to 3 (see FIG. 12) and a comparative example a (see FIG. 13) that are not based on the above-described second embodiment. In order to confirm the effect of the configuration of the second embodiment (example), evaluation and verification by simulation were performed. This simulation was performed using a geometric optical simulation tool (LightTools (registered trademark)) of Cybernet, and the simulation model was configured as shown in FIG.

  Referring to FIG. 11, the surface emitting module model used for the simulation has the following characteristics as a basic configuration. The basic configuration is common to the examples and comparative examples 1 to 3. The virtual light beam emitted from the light emitting layer 13 of the surface light source 10 sequentially passes through the transparent substrate 11, the member corresponding to the base material portion of the prism sheet 20, and the light diffusion portion 31, and then to the detection device (not shown). To reach.

  Here, the “member corresponding to the base material portion of the prism sheet 20” is simply a flat transparent member, and corresponds to a base material portion obtained by removing the uneven pattern 23 (unit prism portion 24) from the prism sheet 20. . FIG. 11 shows the configuration of the embodiment. The prism sheet 20 in FIG. 11 is incident with a concave / convex pattern 23 (unit prism portion 24) in addition to “a member corresponding to the base material portion of the prism sheet 20”. It is provided on the surface 21 side. The detection device evaluated the front luminance profile of the light emitted from the emission surface 22. Based on the front luminance profile, it was verified how much the light source width was widened.

  The light emitting layer 13 of the surface light source 10 has a rectangular shape when viewed from the front. The width WA of the light emitting layer 13 was set to 3.5 mm, and the dimension in the direction orthogonal to the width WA (direction perpendicular to the paper surface) was set to 5.0 mm. The detection device evaluated the front luminance profile in the direction corresponding to the short side direction (the direction of the width WA) of the light emitting layer 13.

  The reflective electrode (cathode 14 shown in FIG. 3) provided on the back side of the light-emitting layer 13 had a specular reflection surface, and the reflectance r was set to 90%. In both the transparent substrate 11 and the prism sheet 20 (base material portion), the transmittance t was set to 100%, and the refractive index n was set to 1.51. The sizes of the transparent substrate 11 and the prism sheet 20 (base material portion) were set to values that could sufficiently cover the light emitting layer 13.

  The thickness HA of the base material portion of the prism sheet 20 (the thickness of the base material portion excluding the portion of the prism sheet 20 where the unit prism portion 24 is formed) was set to 3.0 mm. The thickness HB of the transparent substrate 11 was set to 1.35 mm. Further, a light diffusing portion 31 is provided on the emission surface 22 of the prism sheet 20 (base material portion). The light diffusing portion 31 has a transmittance t set to 95% and a diffusion haze value set to 92%.

  In addition to the above basic configuration, the presence / absence of the concave / convex pattern 23 (BEF) and the presence / absence of the in-plane luminance distribution in the light emitting region RA are considered as additional elements. We compared and verified how it changed.

  Specifically, the comparative example 1 has the light diffusing portion 31 but does not have the uneven pattern 23 (BEF) and does not have the in-plane luminance distribution in the light emitting region RA (Lambertian distribution). ). In Comparative Example 2, in addition to the configuration of Comparative Example 1, it was further provided with a concavo-convex pattern 23 (BEF), but it did not have an in-plane luminance distribution in the light emitting region RA (Lambertian distribution).

  In Comparative Example 3, in addition to the configuration of Comparative Example 1, the in-plane luminance distribution in the light emitting region RA is further included, but the uneven pattern 23 (BEF) is not included. In addition to the configuration of Comparative Example 1, the example has the uneven pattern 23 (BEF) and the in-plane luminance distribution in the light emitting region RA. A comparative example a shown in FIG. 13 includes the surface light source 10 shown in FIG. 11, and does not have the prism sheet 20 (base material portion) itself.

  The concavo-convex pattern 23 (BEF) employed in this experimental example is provided on the surface of the prism sheet 20 on the side facing the light emitting surface 10S, as in the case of the second embodiment. The concavo-convex pattern 23 is a quadrangular pyramid prism having an apex angle of 45 ° and a height of 50 μm, which is parallel to an end of the light emitting region RA (a boundary line between the light emitting region RA and the non-light emitting region RB). It was assumed that a plurality of floors were laid without gaps.

  The in-plane luminance distribution in the light emitting area RA employed in this experimental example is a range from 0 mm to 0.35 mm from both ends in the directions of the arrows X1 and X2 in the light emitting area RA (first outer portion R1 shown in FIG. 5). And a range corresponding to the second outer portion R2) is set to a value twice the light emission luminance of the central portion RC.

(result)
FIG. 12 is a graph showing a relationship (luminance profile) between the light source width and relative luminance as a simulation result according to Comparative Examples 1 to 3 and the example. The relative luminance indicated by the vertical axis in the drawing indicates a value obtained by normalizing the luminance at the center (position where the light source width is shown as 0 mm) as 1.0. Compared with the configuration of Comparative Example 1, it can be seen that according to the configurations of Comparative Examples 2 and 3 and the Example, a luminance profile with a wider light source width can be obtained. Comparing Comparative Examples 2 and 3 and Examples, it can be seen that the configuration of the Examples can widen the light source width most widely among them.

  FIG. 13 is a diagram showing a position (so-called half-width at half maximum) where the luminance is 50% as compared with the central portion, as a simulation result according to Comparative Example a, Comparative Examples 1 to 3, and Examples. By referring to FIG. 13, it is possible to see the degree of spread of the luminance profile shown in FIG. 12 in more detail.

  Specifically, comparing Comparative Examples 1 and 2, it can be seen that the light source width is increased by 0.12 mm when the uneven pattern 23 (BEF) is added. Comparing Comparative Examples 1 and 3, it can be seen that when the in-plane luminance distribution in the light emitting region RA is added, the light source width is increased by 0.12 mm. Comparing Comparative Example 1 and Examples, it can be seen that when both the uneven pattern 23 (BEF) and the in-plane luminance distribution in the light emitting region RA are added, the light source width is increased by 0.29 mm.

  The value of 0.29 mm obtained from the configuration of the example is larger than the total value (0.24 mm) of the values obtained from the configurations of Comparative Examples 2 and 3. According to this result, when the two additional elements respectively employed in Comparative Examples 2 and 3 are combined to solve the problem of expanding the light source width, these two additional elements are independent of each other. It can be seen that a large effect can be obtained as compared with the total value of the effects obtained in the case of implementation.

[Embodiment 4]
With reference to FIGS. 14-16, the surface emitting module in Embodiment 4 is demonstrated. Here, differences between the fourth embodiment and the first embodiment will be described. FIG. 14 is a cross-sectional view illustrating a surface light source 10A provided in the surface emitting module according to the fourth embodiment, and corresponds to FIG. 3 according to the first embodiment. FIG. 15 is a plan view showing the surface light source 10A, and corresponds to the surface light source 10A viewed from the direction of the arrow XV in FIG.

  As shown in FIGS. 14 and 15, in the surface light source 10 </ b> A, the ITO film for forming the anode 12 is used to form the electrode extraction portion 17 (for anode) and the electrode extraction portion 18 (for cathode). It is divided into two regions by patterning. An auxiliary electrode 17a extending along a direction substantially parallel to the first boundary line BL1 is formed on a portion of the anode 12 (transparent electrode) located outside the light emitting region RA (here, the electrode extraction portion 17). Is provided. The electrode extraction part 17 is supplied with power through the wiring member 41 (FIG. 15) and the auxiliary electrode 17a. The electrode extraction portion 18 is supplied with power through the wiring member 42 (FIG. 15).

  In general, ITO or the like that constitutes a transparent electrode has a high electric resistance, and thus is more susceptible to a voltage drop as the distance from a feeding point (for example, a point where the wiring member 41 shown in FIG. 15 is provided) is increased. If the auxiliary electrode is not provided, the luminance decreases concentrically as the distance from the feeding point increases.

  On the other hand, since the auxiliary electrode 17a has a sufficiently low electric resistance compared to the transparent electrode, the potential difference generated in the auxiliary electrode 17a is extremely small. When the auxiliary electrode 17a is provided in the electrode extraction part 17, even if it is away from the point (feeding point) where the wiring member 41 shown in FIG. 15 is provided, the influence of the voltage drop hardly occurs.

  Referring to FIG. 16, the front luminance of light in the directions of arrows X1 and X2 on the light emitting surface 10S of surface light source 10A is the front luminance at any position in the direction orthogonal to arrows X1 and X2. , Which appears substantially the same as the front luminance N2 shown in FIG. The front luminance N2 has the characteristic that the front luminance on the side where the electrode extraction portion 17 shown in FIG. 15 is located is the highest and the front luminance on the side where the electrode extraction portion 18 shown in FIG. Have.

  In the present embodiment, the light emitting region RA has a first outer portion R1 located in the first direction X1 when viewed from the central portion RC of the light emitting region RA, as compared to the front luminance of the central portion RC of the light emitting region RA. Has a luminance distribution with higher front luminance. On the other hand, the light emitting region RA is a front surface of the second outer portion R2 located in the second direction X2 when viewed from the central portion RC of the light emitting region RA, as compared to the front luminance of the central portion RC of the light emitting region RA. It has a luminance distribution in which the luminance is lower.

  According to the surface light emitting module including the surface light source 10A, an effect that the light source is enlarged in the first direction (the direction of the arrow X1) is obtained, and the first light emitting region RA in the non-light emitting region RB is particularly viewed from the first. The part located in the direction (arrow X1 direction) can be made inconspicuous.

[Embodiment 5]
With reference to FIGS. 17-19, the surface emitting module in Embodiment 5 is demonstrated. Here, differences between the fifth embodiment and the first embodiment will be described. FIG. 17 is a cross-sectional view showing a surface light source 10C provided in the surface emitting module in the fifth embodiment, and corresponds to FIG. 3 in the first embodiment. FIG. 18 is a plan view showing the surface light source 10C and corresponds to the surface light source 10C viewed from the direction of the arrow XVIII in FIG. FIG. 19 is a bottom view showing the surface light source 10C, and corresponds to the surface light source 10C viewed from the direction of the arrow XIX in FIG.

  As shown in FIGS. 17 and 19, in the surface light source 10 </ b> C, a portion of the anode 12 (transparent electrode) located on the outer periphery of the light emitting region RA (a portion of the electrode extraction portion 17 appearing in FIG. 18). Auxiliary electrodes 17a to 17d are respectively provided.

  As shown in FIG. 19, the light emitting region RA of the present embodiment has a central portion RC and an outer peripheral portion RD. The outer peripheral portion RD is a portion located on the outer periphery of the central portion RC in the light emitting region RA. The boundary line that partitions the outer peripheral portion RD and the non-light emitting region RB of the light emitting region RA has a rectangular shape. This boundary line includes a first boundary line BL1 and a second boundary line BL2. The four auxiliary electrodes 17a to 17d (FIG. 18) extend along a direction substantially parallel to the four sides of the boundary line, and are arranged in a rectangular shape as a whole.

  The electrode extraction part 17 is supplied with power through the wiring members 41 to 44 (FIG. 18) and the auxiliary electrodes 17a to 17d. The electrode extraction portion 18 is supplied with power through the wiring member 45 (FIG. 18). The front luminance of the light emitted from the light emitting surface 10S of the surface light source 10C is highest at the portion corresponding to the positions of the auxiliary electrodes 17a to 17d, and gradually decreases toward the center of the central portion RC. That is, the light emitting region RA has a luminance distribution in which the front luminance of the outer peripheral portion RD is higher than the front luminance of the central portion RC. Such a luminance distribution can be easily realized by using the auxiliary electrodes 17a to 17d.

  The light emitted from the light emitting region RA of the surface light source 10C enters the prism sheet 20 (see FIG. 8) from the incident surface 21. At this time, the uneven pattern 23 of the prism sheet 20 refracts light incident on the prism sheet 20. The light that is emitted from the light emitting region RA so as to spread obliquely outward with respect to the normal direction of the light emitting region RA and is incident on the prism sheet 20 is more increased by the uneven pattern 23 than before entering the prism sheet 20. It is deflected to spread diagonally outward.

  More specifically, light radiated from the light emitting region RA toward the first direction X1 with respect to the normal direction of the light emitting region RA and incident on the prism sheet 20 is incident on the prism sheet 20 by the concave / convex pattern 23. It is deflected so as to spread toward the first direction X1 more than before. Similarly, the light radiated from the light emitting region RA toward the second direction X2 with respect to the normal direction of the light emitting region RA and incident on the prism sheet 20 before entering the prism sheet 20 by the concave / convex pattern 23. Compared to the second direction X2, the light is deflected. Further, the light radiated from the light emitting region RA to the side of the direction perpendicular to the first direction X1 with respect to the normal direction of the light emitting region and incident on the prism sheet 20 is incident on the prism sheet 20 by the concave / convex pattern 23. It is deflected so as to spread to the same direction side as before. The same applies to the opposite direction.

  According to the surface light emitting module including the surface light source 10C, not only the first direction (arrow X1 direction) side and the second direction (arrow X2 direction) side with respect to the normal direction of the light emitting area RA, but also the light emitting area. The effect that the light source expands to the side in the direction orthogonal to the first direction with respect to the normal direction of RA and the side opposite thereto is obtained, and the first light source region RB is seen from the light emitting region RA. A portion located in one direction (arrow X1 direction), a second direction (arrow X2 direction), a direction orthogonal to the first direction, and the opposite direction can be made inconspicuous.

(Modification of Embodiment 5)
Referring to FIG. 20, a higher effect can be obtained by using prism sheet 20A. The concavo-convex pattern 23 formed on the incident surface 21 of the prism sheet 20A is composed of a plurality of unit prism portions 24 arranged in the matrix direction. Each of the plurality of unit prism portions 24 has a quadrangular pyramid shape (so-called pyramid), and inclined surfaces 26a to 26d are formed on the surface. The prism sheet 20A is also disposed so that the concave / convex pattern 23 (incident surface 21) faces the light emitting surface of the surface light source.

  In the prism sheet 20A, inclined surfaces (for example, inclined surfaces 26a and 26c) formed in the plurality of unit prism portions 24 extend along a direction substantially parallel to the first boundary line BL1 and the second boundary line BL2. To be arranged. The inclined surfaces 26a to 26d of the unit prism portion 24 use the action of light refraction, so that the light is transmitted in the first direction (arrow X1 direction) side in the second direction (direction of the arrow X1) with respect to the normal direction of the light emitting region RA. It is advanced to the direction of arrow X2), the direction orthogonal to the first direction, and the opposite direction. Therefore, by using the prism sheet 20A, the light source width can be effectively expanded in all four directions. The substantially similar or similar effect is not limited to the case where the unit prism portion 24 has a quadrangular pyramid shape, but a conical shape (for example, a polygonal pyramid shape such as a conical shape, a triangular pyramid shape, a quadrangular pyramid shape). It can also be obtained by a unit prism portion 24 having a truncated cone shape (a truncated cone shape, a triangular truncated cone shape, a quadrangular truncated cone shape, or the like).

[Embodiment 6]
Referring to FIG. 21, in each of the above-described embodiments, one surface light source is disposed to face one prism sheet. As in the surface emitting module 105 illustrated in FIG. 21, a plurality of surface light sources 10 </ b> M and 10 </ b> N may be configured to face one prism sheet 20. Due to the effect of increasing the light source width, the gap generated between the surface light sources 10M and 10N can be made inconspicuous. The configuration in the seventh embodiment can be implemented in combination with the first to fifth embodiments described above.

[Other embodiments]
In the above description regarding the auxiliary electrode, it has been described that the auxiliary electrode is provided on the transparent electrode (ITO) constituting the anode 12, but when the cathode 14 is formed of a transparent electrode, the auxiliary electrode is provided on the cathode 14 side. You may use.

  In the above-described embodiment, the auxiliary electrode is used to increase the luminance of the outer peripheral portion and the peripheral portion of the light emitting surface 10S of the surface light source 10 as compared with the central portion. However, the brightness distribution may be generated by using a filter member that reduces the transmittance of the central portion in order to increase the luminance of the outer peripheral portion and the peripheral portion as compared with the central portion. Alternatively, UV light or laser light is irradiated to the central portion of the light emitting region, and the light emitting layer in the central portion is deteriorated to reduce the light emission efficiency of the irradiated portion. Thereby, the luminance of the central portion may be lowered and the luminance of the peripheral portion may be relatively increased.

  The surface light source described in each of the above embodiments is a so-called bottom emission type organic EL element. The surface light source is not limited to the above, and may be a top emission type organic EL element. The surface light source may be composed of a plurality of light emitting diodes and a diffusion plate arranged on the emission surface side of the plurality of light emitting diodes, or may be composed of a cold cathode tube or the like. There may be. As the surface light source, an inorganic EL may be used in addition to the organic EL, or a light source diode and a light guide plate may be used.

  Although the embodiments and examples have been described above, the above disclosure is illustrative in all respects and not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10, 10A, 10C, 10M, 10N surface light source, 10S light emitting surface, 11 transparent substrate, 12 anode (transparent electrode), 13 light emitting layer, 14 cathode, 15 sealing member, 16 insulating layer, 17, 18 electrode extraction part, 17a, 17b, 17c, 17d Auxiliary electrode, 20, 20A Prism sheet, 21 entrance surface, 22 exit surface, 23 uneven pattern, 24 unit prism portion, 25 valley portion, 26, 26a, 26b, 26c, 26d, 28 inclined surface 27 Mountain part 31, 32 Light diffusion part 41, 42, 43, 44, 45 Wiring member, 100, 101, 102, 105 Surface emitting module, BL1 first boundary line, BL2 second boundary line, HA, HB Thickness, N1, N2 front luminance, P1, P2, Q1, Q2 points, R1 first outer portion, R2 second outer portion, RA light emitting region, RA1a, RA 1b, RA2 line, RB non-light emitting region, RC central portion, RD outer peripheral portion, WA width, X1 first direction, X2 second direction.

Claims (10)

A surface light source having a light emitting surface;
A prism sheet having an entrance surface and an exit surface, a concavo-convex pattern formed on the entrance surface, and the concavo-convex pattern disposed to face the light emitting surface,
The light emitting surface includes a light emitting region and a non-light emitting region formed around the light emitting region,
In the light emitting region, the front luminance of the first outer portion located in the first direction when viewed from the central portion of the light emitting region is higher than the front luminance of the central portion of the light emitting region. Has a luminance distribution,
The light emitted from the light emitting region toward the first direction with respect to the normal direction of the light emitting region and incident on the prism sheet is more incident on the prism sheet than the light incident on the prism sheet due to the uneven pattern. Deflected to spread in one direction,
Surface emitting module. A first boundary line that is located in the first direction as viewed from the first outer portion and that partitions the first outer portion and the non-light-emitting region is along a direction that intersects the first direction. It has a linear shape that extends,
The uneven pattern of the prism sheet has a plurality of inclined surfaces,
Each of the plurality of inclined surfaces is formed so as to extend along a direction substantially parallel to the first boundary line and to be arranged in order along the first direction.
The surface emitting module according to claim 1. The surface light source is composed of an organic EL that feeds power to the light emitting layer through a transparent electrode,
A portion of the transparent electrode located outside the light emitting region is provided with an auxiliary electrode extending along a direction substantially parallel to the first boundary line.
The surface emitting module according to claim 2. The surface light source is composed of an organic EL that feeds power to the light emitting layer through a transparent electrode,
Two auxiliary electrodes extending along a direction substantially parallel to the first boundary line are provided on portions of the transparent electrode located on both outer sides of the light emitting region,
The second direction is the direction opposite to the first direction, and the portion located in the second direction when viewed from the central portion of the light emitting region is the second outer portion. A second boundary line located in the second direction and defining the second outer portion and the non-light-emitting region extends along a direction substantially parallel to the first boundary line. And
The light emitting region has a luminance distribution in which the front luminance of the first outer portion and the second outer portion of the light emitting region is higher than the front luminance of the central portion of the light emitting region. And
Light that radiates from the light emitting region to the side of the second direction with respect to the normal direction of the light emitting region and is incident on the prism sheet is more likely to be incident on the prism sheet than the light incident on the prism sheet due to the uneven pattern. Deflected to spread in two directions,
The surface emitting module according to claim 2. A light diffusion part is provided on the emission surface of the prism sheet.
The surface emitting module of any one of Claim 2 to 4. The light emitting surface of the surface light source is provided with another light diffusion portion,
The surface emitting module according to claim 2. The uneven pattern of the prism sheet is composed of a plurality of unit prism portions arranged in a matrix direction,
Each of the plurality of unit prism portions has a conical or frustum shape, and the inclined surface is formed on the surface.
The surface emitting module according to claim 2. The surface light source is composed of an organic EL that feeds power to the light emitting layer through a transparent electrode,
When a portion located on the outer periphery of the central portion of the light emitting region is defined as an outer peripheral portion, a boundary line that includes the first boundary line and divides the outer peripheral portion and the non-light emitting region has a rectangular shape. And
Four auxiliary electrodes extending along a direction substantially parallel to the four sides of the boundary line are respectively provided in portions of the transparent electrode located on the outer periphery of the light emitting region,
The light emitting region has a luminance distribution in which the front luminance of the outer peripheral portion located on the outer periphery of the central portion of the light emitting region is higher than the front luminance of the central portion of the light emitting region. And
The light that radiates from the light emitting region so as to spread obliquely outward with respect to the normal direction of the light emitting region and is incident on the prism sheet is more than before the light incident on the prism sheet due to the uneven pattern. Deflected so as to spread diagonally outward,
The surface emitting module according to claim 7. A plurality of the surface light sources are arranged to face one prism sheet,
The surface emitting module of any one of Claim 1 to 8. The surface light source and the prism sheet have flexibility.
The surface emitting module of any one of Claim 1 to 9.

Images