JP4989363B2 - Planar light emitting device - Google Patents

Description

  The present invention relates to a planar light emitting device used for a backlight of a liquid crystal display.

  In recent years, organic electroluminescence (also referred to as organic EL) elements have attracted attention as light emitting elements. An organic electroluminescence element (hereinafter abbreviated as “organic EL element”) has a very short time from energization to light emission, and the luminance changes instantaneously when the current is changed. In other words, it has excellent responsiveness and responsiveness. Has a characteristic that it hardly changes with temperature, and a viewing angle is close to 180 degrees.

  For example, as shown in FIG. 3, the light-emitting element 1 including such an organic EL element includes a support substrate 10 made of a transparent substrate (for example, a glass substrate) and one surface side of the support substrate 10 (upper surface side in FIG. 3). The transparent electrode 11 made of ITO or the like formed on the light emitting layer 12, the light emitting layer 12 made of an organic material formed on the opposite side of the transparent electrode 11 from the support substrate 10, and the light emitting layer 12 formed on the opposite side of the transparent electrode 11 And a sealing layer 14 formed so as to cover the light emitting layer 12 on the side opposite to the light emitting layer 12 in the reflective electrode 13. In the light-emitting element 1, the transparent electrode 11 and the reflective electrode 13 are connected to a power source (not shown) by bonding wires W, and the light-emitting layer 12 emits light when a predetermined potential is applied to the transparent electrode 11 and the reflective electrode 13. .

  When the light emitting layer 12 emits light, the light emitted from the light emitting layer 12 to the transparent electrode 11 side passes through the transparent electrode 11, enters the support substrate 10, passes through the support substrate 10, and passes through the support substrate 10. The light is emitted outward from the other surface side (the lower surface side in FIG. 3). On the other hand, the light emitted from the light emitting layer 12 to the reflective electrode 13 side is reflected by the reflective electrode 13 to the transparent electrode 11 side, and similarly emitted from the other surface side of the support substrate 10 outward. That is, in the light emitting element 1, the other surface of the support substrate 10 is a light emitting surface 10a.

  The light-emitting element 1 composed of the organic EL element as described above is suitable for surface light emission, and in recent years, for example, it is used in a planar light-emitting device L used for a backlight of a liquid crystal display (liquid crystal display device). . As shown in FIG. 4, the planar light emitting device L includes a plurality of light emitting elements 1 arranged in such a manner that each light emitting surface 10 a is positioned on the same plane.

  By the way, the light-emitting element 1 includes a transparent electrode 11 and a reflective electrode 13 for allowing a current to flow through the light-emitting layer 12, and the light-emitting layer 12 is secured in order to secure a portion where the bonding wire W is connected to the transparent electrode 11 and the reflective electrode 13. Is formed on the one surface side of the support substrate 10 so as to overlap a part of the one surface in the thickness direction, and is not formed so as to overlap the entire surface of the one surface in the thickness direction. Therefore, in the light emitting surface 10a of the light emitting element 1, as shown in FIG. 3, there are a portion that overlaps the light emitting layer 12 in the thickness direction and a portion that does not overlap. Therefore, in the light emitting surface 10a of the light emitting element 1, the brightness differs between the portion that overlaps the light emitting layer 12 in the thickness direction and the portion that does not overlap, and as a result, the region A1 where the light emitting layer 12 exists as shown in FIG. And brightness will differ in area | region A2 (site | part between the light emitting layers 12 of the adjacent light emitting element 1) where the light emitting layer 12 does not exist.

Therefore, in the planar light emitting device L, for example, a light diffusing plate 200 made of milky white translucent material is disposed opposite to the light emitting surface 10a of the light emitting element 1, so that no difference in brightness occurs. Therefore, the uniformity of the planar light emitting device L is improved (as a well-known technical example using a light diffusion plate for improving the uniformity, Patent Document 1 is cited).
No. 2006-208510

  By the way, in recent years, it is desired to reduce the thickness of the liquid crystal display, and accordingly, it is desired to reduce the thickness of the planar light emitting device L. Here, in reducing the thickness of the planar light emitting device L, it is conceivable to shorten the distance between the light diffusing plate 200 and the light emitting surface 10 a of the light emitting element 1, but the light diffusing plate 200 is used as the light emitting surface of the light emitting element 1. The closer to 10a, the more the light diffusing plate 200 becomes unable to diffuse the light, and the uniformity becomes worse. In other words, in order to improve the uniformity by the light diffusing plate 200, it is necessary to separate the light diffusing plate 200 from the light emitting surface 10a of the light emitting element 1, which hinders the thinning of the planar light emitting device L. It was.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a planar light emitting device capable of improving the uniformity while achieving a reduction in thickness.

In order to solve the above-described problem, in the invention of claim 1, a planar light-emitting device in which a plurality of light-emitting elements are arranged in a shape in which each light-emitting surface is located on the same plane, A light emitting surface side of a light emitting element, comprising: a support substrate; and an organic electroluminescence device comprising a support substrate and a light emitting layer made of an organic material formed on one surface side of the support substrate so as to overlap a part of the surface in the thickness direction. The light guide member is disposed so as to straddle between the light emitting layers of the adjacent light emitting elements, and the light guide member is arranged so as to overlap each end portion of the light emitting layer of the adjacent light emitting element in the thickness direction. A light emitting surface provided on the opposite side of the incident surface and the surface facing the portion between the light emitting layers of the adjacent light emitting elements, and a part of the light incident from the light incident surface is reflected to the light emitting surface side. Light reflected from the light reflecting surface and the light reflected from the light reflecting surface E Bei a light scattering means for emitted from reflecting surface, the light guide member is formed in a trapezoidal shape which is more narrow away from the light emitting surface of the light emitting element, slope constitute the reflecting surface, the light-scattering The means is characterized by comprising the above-mentioned facing surface subjected to light scattering treatment .

According to the first aspect of the present invention, the light emitted from the end portion of the light emitting layer enters the light guide member from the light incident surface of the light guide member, a part of which is reflected by the reflective surface, and the rest is reflected. The light that is emitted from the light guide member as it is without being reflected by the surface and is reflected by the reflection surface is scattered by the light scattering means and then emitted from the light exit surface to the outside of the light guide member. The visual effect as if light is radiated from the part between the light emitting layers of the element can be given, so that the uniformity can be improved, and unlike the conventional diffuser plate, it is not necessary to be spaced apart from the light emitting surface to some extent. Further, since it is preferable to dispose the light emitting surface close to the light emitting surface, the thickness can be reduced . According to the invention of claim 1, since the light guide member can be formed by simple processing, the manufacturing cost can be reduced.

In the invention of claim 2, in the invention of claim 1, the upper Symbol light scattering means is characterized in that the light emitting surface of the light scattering process is applied and consists of both the opposing faces.

  According to the invention of claim 2, since the light guide member can be formed by simple processing, the manufacturing cost can be reduced.

  In the invention of claim 3, in the invention of claim 2, the light scattering treatment includes surface roughening treatment, treatment for printing a predetermined light diffusion pattern with ink containing a light diffusing pigment as a component, and diffusing light. It is any one of the fine processing which forms a some recessed part, and the process which forms a microprotrusion.

  According to the invention of claim 3, since the light scattering means can be provided on the light guide member by a simple process, the manufacturing cost can be reduced.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the light scattering means scatters light as the distance from the light emitting layer of the adjacent light emitting element increases.

  According to invention of Claim 4, it can suppress that it becomes darker as the site | part spaced apart from a light emitting layer in the light-projection surface of a light guide member, improvement of the uniformity in a light-projection surface can be aimed at, and the improvement of the further uniformity is improved. I can plan.

  The present invention has an effect of improving the uniformity while reducing the thickness.

(Embodiment 1)
The planar light emitting device L of the present embodiment is used as a backlight of a liquid crystal display, for example, and includes a plurality of light emitting elements 1 as shown in FIG.

  The light-emitting element 1 includes an organic EL element, and includes a support substrate 10, a transparent electrode 11 formed on one surface side of the support substrate 10 (a lower surface side in FIG. 1), and the opposite side of the transparent electrode 11 from the support substrate 10. A light emitting layer 12 formed on the opposite side of the light emitting layer 12 from the transparent electrode 11, and one of the transparent electrode 11 and the reflective electrode 13 on the one surface side of the support substrate 10. And a sealing portion 15 that is attached so as to cover the light emitting layer 12.

  The support substrate 10 is a member for supporting the light emitting layer 12, and is formed in a rectangular plate shape from a material having translucency with respect to light emitted from the light emitting layer 12, for example. As such a support substrate 10, for example, a transparent substrate such as a glass substrate can be used.

  The transparent electrode 11 is a conductive thin film made of a material that transmits light with respect to light emitted from the light emitting layer 12. As a material of such a transparent electrode 11, a transparent conductive material such as ITO (Indium Tin Oxide) is used. In addition, the material of the transparent electrode 11 may be a material that allows light to pass therethrough, and it is also conceivable to use a carbon nanonet or the like.

  The light emitting layer 12 is made of, for example, an organic material of a fluorescent material or an organic material containing a fluorescent material, and includes a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and the like as necessary. Further, the light emitting layer 12 is appropriately designed so as to obtain light of a desired color (for example, white light).

  The reflective electrode 13 is a conductive thin film made of a material that reflects light emitted from the light emitting layer 12. As the material of the reflective electrode 13, for example, aluminum (Al), aluminum / lithium alloy, magnesium / silver alloy, or the like can be used.

  The sealing portion 15 is formed in a box shape having one surface opened by, for example, an insulating material (for example, glass). As described above, the transparent electrode 11 and the support electrode 10 are formed on the one surface side of the support substrate 10. A part of the reflective electrode 13 is exposed and attached to cover the light emitting layer 12. The sealing portion 15 is airtightly attached to the support substrate 10 with an adhesive or the like in order to prevent the light emitting layer 12 made of an organic material from gradually degrading due to the influence of oxygen or moisture. Here, the part of the transparent electrode 11 exposed from the sealing part 15 and the part of the reflective electrode 13 form a power supply terminal part.

  In such a light emitting element 1, the transparent electrode 11 and the reflective electrode 13 are connected to a power source by connecting the power supply terminal portions to an electrode pad (not shown) by bonding wires W, and the transparent electrode 11 and the reflective electrode. Light is emitted from the light emitting layer 12 by applying a predetermined potential to each of the light emitting layers 13. At this time, the light emitted from the light emitting layer 12 to the transparent electrode 11 side passes through the transparent electrode 11, enters the support substrate 10, passes through the support substrate 10, and is on the other surface side of the support substrate 10 (see FIG. 1 is emitted to the outside of the support substrate 10. On the other hand, the light radiated from the light emitting layer 12 to the reflective electrode 13 side is reflected by the reflective electrode 13 to the transparent electrode 11 side, then passes through the support substrate 10, and from the other surface side of the support substrate 10 to the support substrate. 10 is emitted to the outside. That is, in the light emitting element 1, the other surface of the support substrate 10 is a light emitting surface 10a.

  A plurality of such light emitting elements 1 are arranged on one surface of a flat support plate (not shown) so that the light emitting surfaces 10a are located on the same plane.

  Here, on the light emitting surface 10a side (upper surface side in FIG. 1) of the light emitting element 1, as shown in FIG. 1, the light guide member 2 is disposed so as to straddle between the light emitting layers 12 of the adjacent light emitting elements 1. Has been.

  The light guide member 2 is made of, for example, a light-emitting element 1 made of a material that transmits light emitted from the light-emitting layer 12 (for example, a transparent resin material such as acrylic resin, polycarbonate resin, or polypropylene resin, or glass). It is formed in a trapezoidal shape (isosceles trapezoidal shape in the illustrated example) that becomes narrower as the distance from the light emitting surface 10a increases.

  The light guide member 2 is adjacent to the light emitting surface 10a side of the light emitting element 1 on both sides in the width direction (left and right direction in FIG. 1) of one surface (the lower bottom surface in FIG. 1) facing the light emitting surface 10a. Each of the light emitting layers 12 is arranged so as to face the end (edge) of each light emitting layer 12, and the portion facing the end of each light emitting layer 12 of each adjacent light emitting element 1 on the one surface is a light emitting layer of each light emitting element 1. 12 is used as a light incident surface 20 on which light emitted by 12 is incident. Further, a surface (upper bottom surface in FIG. 1) opposite to the surface 21 facing the portion between the light emitting layers 12 of the adjacent light emitting elements 1 in the light guide member 2 is used as the light emitting surface 22.

  In addition, the inclined surface of the light guide member 2 reflects a part of the light incident from the light incident surface 20 so as to be emitted from the light emitting surface 22 and emits the rest without reflecting the light guide member 2. Used as the reflecting surface 23. Here, the inclined surface serving as the reflection surface 23 is formed in a shape extending over the region A1 where the light emitting layer 12 exists and the region A2 where the light emitting layer 12 does not exist. In addition, the angle of the inclined surface that becomes the reflection surface 23 is set to an angle that does not reflect all of the light incident on the light guide member 2 from the light incident surface 20 but reflects a part thereof.

  The opposing surface 21 of the light guide member 2 is subjected to light scattering processing. Here, the light scattering process is a process of printing the light diffusion pattern 24 on the opposing surface 21 with ink containing a light diffusing pigment as a component (for example, white ink), and the opposing surface 21 on which such a light scattering process has been performed. However, it constitutes a light scattering means that scatters the light reflected by the light reflecting surface 23 and emits it from the light emitting surface 22. In the present embodiment, the light diffusion pattern 24 is a pattern in which almost the entire opposing surface 21 is painted with white ink.

  As described above, the light guide member 2 of the present embodiment includes the light incident surface 20 that is disposed in the thickness direction so as to overlap each end portion of the light emitting layer 12 of the adjacent light emitting element 1, and the adjacent light emitting element 1. A light emitting surface 22 provided on the side opposite to the surface 21 facing the portion between the light emitting layers 12 and a light reflecting surface 23 that reflects a part of the light incident from the light incident surface 20 to the light emitting surface 22 side. And a light scattering means 24 that scatters the light reflected by the light reflecting surface 23 and emits the light from the light emitting surface 22.

  The planar light emitting device L of the present embodiment includes the light emitting element 1 and the light guide member 2 described above. When a predetermined potential is applied to each of the transparent electrode 11 and the reflective electrode 13 of each light emitting element 1 to cause the light emitting layer 12 to emit light, the light emitted from the light emitting layer 12 to the transparent electrode 11 side is transparent. After passing through the electrode 11, the light enters the support substrate 10, passes through the support substrate 10, and is emitted outward from the other surface side (upper surface side in FIG. 1) of the support substrate 10. On the other hand, the light emitted from the light emitting layer 12 to the reflective electrode 13 side is reflected by the reflective electrode 13 to the transparent electrode 11 side, and similarly emitted from the other surface side of the support substrate 10 outward.

At this time, as shown in FIG. 1, the light B1 and B2 emitted from the end portion of the light emitting layer 12 is incident on the light guide member 2 from the incident surface 20, passes through the light guide member 2, and is reflected on the reflective surface 23. Proceed to Here, the light B2 whose incident angle to the reflecting surface 23 is less than a critical angle (approximately 42 degrees when the light guide member 2 is made of acrylic resin and the light guide member 2 is placed in the air). Is not reflected by the reflecting surface 23 and is emitted outside the light guide member 2. On the other hand, the light B1 having an incident angle with respect to the reflecting surface 23 that is equal to or greater than the critical angle is totally reflected by the reflecting surface 23, whereby the light B1 travels in the light guide member 2 toward the facing surface 21. The light B1 in the opposing surface 21 of the light scattering means is scattered, light B1 scattered proceeds toward the inside of the light guide member 2 to the light emitting surface 22, the light exit surface 22 by Rishirubeko member 2 It is emitted outside.

  Therefore, on the light emitting surface 10a of the light emitting element 1, as shown in FIG. 1, a portion that overlaps the light emitting layer 12 in the thickness direction (region A1 where the light emitting layer 12 exists) and a portion that does not overlap (region where the light emitting layer 12 does not exist). Even if there is A2), by emitting light from the light emitting surface 22 of the light guide member 2, it can appear as if light is emitted from the region A2. In addition, the reflecting surface 23 of the light guide member 2 reflects a part of the light emitted from the end of the light emitting layer 12 without reflecting all of the light, and therefore corresponds to the end of the light emitting layer 12 in the region A1. Does not get too dark.

Therefore, according to the planar light emitting device L of the present embodiment described above, the light emitted from the end of the light emitting layer 12 enters the light guide member 2 from the light incident surface 20 of the light guide member 2, A part of the light is reflected by the reflecting surface 23, the rest is not reflected by the reflecting surface 23, and is emitted as it is to the outside of the light guide member 2, and the light reflected by the reflecting surface 23 is scattered by the light scattering means, Since the light is emitted from the light emitting member 22 to the outside of the light guide member 2, it is possible to give a visual effect as if light is emitted from a portion between the light emitting layers 12 of the adjacent light emitting elements 1 and light is emitted continuously as a whole. Therefore, the degree of uniformity can be improved, and the total light reflection is utilized to move the light in the light guide member 2 in the creeping direction of the light emitting surface 10a (the horizontal direction in FIG. 1). Unlike the plate 200, it is separated to some extent from the light emitting surface 10a. It is not necessary, because it is preferable that arranged close to the light emitting surface 10a in the opposite, thereby be made thinner than the conventional.

  Furthermore, according to the planar light emitting device L of the present embodiment, the light guide member 2 is formed in a trapezoidal shape that becomes narrower as the distance from the light emitting surface 10 a of the light emitting element 1 increases, and the inclined surface forms the reflecting surface 23. Since the light scattering means is composed of the opposing surface 21 that has been subjected to the light scattering treatment, the light guide member 2 can be formed by simple processing, so that the manufacturing cost can be reduced.

  In addition, the light scattering process is a process of printing a predetermined light diffusion pattern 24 on the opposing surface 21 with an ink containing a light diffusing pigment as a component (in this embodiment, a process of painting almost the entire opposing surface 21 with a white ink). Therefore, since the light scattering means can be provided on the light guide member 2 by a simple process, the manufacturing cost can be reduced.

Such light scattering treatment is not limited to the above example, and surface roughening treatment such as sandblasting, fine processing treatment for forming a plurality of concave portions for diffusing light, and treatment for forming fine protrusions. The light scattering means can be provided on the light guide member 2 with a simple process, so that the manufacturing cost can be reduced. Furthermore, the light scattering process may be performed by a method different from these, or a plurality of light scattering processes may be combined. Further, in the present embodiment, by applying the light scattering process the facing surface 21 of the light guide member 2, but using the opposing surfaces 21 as the light scatterer, light scattering process is subjected to light emitted reflecting surface 22 in may light emitted reflecting surface 22 so as to use as a light scattering means, both of the opposing surfaces 21 and light emitted reflecting surface 22 may be utilized as a light scattering means. Also, more surface light equipment L of the embodiment described, only a one embodiment of the present invention is not intended to limit the invention to this embodiment, without departing from the spirit of the present invention A degree of deformation is possible. These points are the same in the second embodiment described later.

(Embodiment 2)
As shown in FIG. 2, the planar light-emitting device L of the present embodiment is different from the first embodiment in the configuration of the light guide member 2, and the other configurations are the same as those in the first embodiment. Are denoted by the same reference numerals and description thereof is omitted.

  The light guide member 2 in this embodiment is not a single member but is composed of a pair of one-side light guide members 2A.

  The one-side light guide member 2A is made of, for example, a light-emitting element made of a material that transmits light emitted from the light-emitting layer 12 (for example, a transparent resin material such as acrylic resin, polycarbonate resin, or polypropylene resin, or glass). It is formed in a trapezoidal shape that becomes narrower as it is separated from one light emitting surface 10a. Further, the one-side light guide member 2A has an angle with one side surface (the right side surface in the left-side one-side light guide member 2A in FIG. 2) 25 and one surface (the lower bottom surface in FIG. 2) facing the light emitting surface 10a, and The angle with the other surface (upper bottom surface in FIG. 2) opposite to the one surface is a right angle, and the other side surface (the left side surface in the left side light guide member 2A in FIG. 2) is the one surface and the above surface. The slope is inclined with respect to the other surface. That is, the one-side light guide member 2A is formed in a trapezoidal shape in which the light guide member 2 in the first embodiment is divided into two in the width direction (left-right direction in FIG. 2).

  Such a one-side light guide member 2 </ b> A is arranged on the light emitting surface 10 a side of the light emitting element 1 such that the portion on the other side of the one surface faces the end of the light emitting layer 12 of the light emitting element 1. A light incident surface 20 on which light emitted from the light emitting layer 12 of the light emitting element 1 is incident on a portion of the one surface facing the end of the light emitting layer 12 (that is, a portion on the other side surface of the one surface). Used as Moreover, the site | part except the light-incidence surface 20 in the said one surface turns into the opposing surface 21 with the site | part between the light emitting layers 12 of the adjacent light emitting element 1 in the one side light guide member 2A, The said other side on the opposite side to this opposing surface 21 The surface is used as the light exit surface 22.

  Further, the inclined surface of the one-side light guide member 2A reflects in order to emit a part of the light incident from the light incident surface 20 from the light exit surface 22, and outside the one-side light guide member 2A without reflecting the rest. It is used as a reflective surface 23 that emits light to the surface. Here, the inclined surface serving as the reflection surface 23 is formed in a shape extending over the region A1 where the light emitting layer 12 exists and the region A2 where the light emitting layer 12 does not exist. In addition, the angle of the inclined surface serving as the reflection surface 23 is set to an angle that does not reflect all of the light incident from the light incident surface 20 into the one-side light guide member 2A but reflects a part thereof.

  And the light scattering process is made to the opposing surface 21 of 2 A of one side light guide members. This light scattering process is a process of printing the light diffusion pattern 24 on the opposing surface 21 with an ink (for example, white ink) containing a light diffusing pigment as a component, and the opposing surface 21 subjected to such a light scattering process is The light scattering means is configured to scatter the light reflected by the light reflecting surface 23 and emit the light from the light emitting surface 22.

  The light diffusion pattern 24 in the present embodiment is not formed by coating almost the entire surface of the opposed surface 21 with white ink as in the first embodiment. For example, the opposed surface 21 is separated from the light emitting layer 12 of the light emitting element 1. The area of the white ink applied to 21 increases. As the light diffusion pattern 24, in addition to the example shown in FIG. 2, a pattern in which the density of circular dots increases as the distance from the light emitting layer 12 of the light emitting element 1 increases. In short, the light diffusion pattern 24 may be any pattern that scatters more light as it is separated from the light emitting layer 12 of the adjacent light emitting element 1. Such a light diffusion pattern 24 can also be adopted in the first embodiment.

  By arranging the pair of one-side light guide members 2A described above in such a manner that the side surfaces 25 face each other, the two light-guiding members 1A are arranged so as to overlap each end of the light emitting layer 12 of the adjacent light emitting element 1 in the thickness direction. A light emitting surface 22 provided on the side opposite to the facing surface 21 between the light incident surface 20 and a portion between the light emitting layers 12 of the adjacent light emitting elements 1, and a part of the light incident from the light incident surface 20 The light guide member 2 includes a light reflecting surface 23 that reflects to the light emitting surface 22 side, and a light scattering means 24 that scatters the light reflected by the light reflecting surface 23 and emits the light from the light emitting surface 22. .

  And in this light guide member 2, since the light scattering means scatters light as the distance from the light emitting layer 12 of the adjacent light emitting element 1 increases, the uniformity on the light emitting surface 22 can be improved. It can suppress that the center part in the site | part between the adjacent light emitting elements 1 becomes darker than another site | part (it becomes dark, so that it leaves | separates from the light emitting layer 12).

  Therefore, according to the planar light emitting device L of the present embodiment, the same effects as those of the first embodiment can be obtained, and further the uniformity can be improved. The light guide member 2 in the present embodiment is not necessarily constituted by a pair of one-side light guide members 2A, and may be a single member as in the first embodiment, but the light guide member 2 is a pair of one-side guides. By configuring with the light member 2A, the light guide member 2 can be provided on the light emitting element 1 without arranging the light emitting elements 1 in a predetermined arrangement, so that the assembly work of the planar light emitting device L is facilitated.

1 is a schematic cross-sectional view of a planar light emitting device according to Embodiment 1. FIG. It is a schematic sectional drawing of the planar light-emitting device of Embodiment 2. It is a schematic sectional drawing of the conventional light emitting element. It is a schematic sectional drawing of the conventional planar light-emitting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Light guide member 10a Light emission surface 12 Light emission layer 20 Light incident surface 21 Opposite surface 22 Light output surface 23 Light reflection surface L Planar light-emitting device

Claims (4)

A planar light emitting device in which a plurality of light emitting elements are arranged in such a manner that each light emitting surface is located on the same plane,
The light-emitting element comprises an organic electroluminescence element comprising a support substrate and a light-emitting layer made of an organic material formed in a shape overlapping with a part of the one surface on the one surface side of the support substrate,
On the light emitting surface side of the light emitting element, a light guide member is disposed in a form straddling between the light emitting layers of adjacent light emitting elements,
The light guide member is disposed on the opposite side of the light incident surface arranged in the thickness direction so as to overlap each end portion of the light emitting layer of the adjacent light emitting element and the surface facing the portion between the light emitting layers of the adjacent light emitting element. The provided light emitting surface, the light reflecting surface that reflects a part of the light incident from the light incident surface to the light emitting surface side, and the light reflected by the light reflecting surface is scattered and emitted from the light emitting surface. e Bei and light scattering means, the light guide member is formed in a trapezoidal shape which is more narrow away from the light emitting surface of the light emitting element, slope constitute the light reflecting surface, the light scattering means, light A planar light emitting device comprising the above-described facing surface subjected to a scattering treatment . Upper Symbol light scattering means, the planar light emitting device according to claim 1, characterized in that the light emitting surface of the light scattering process is applied and consists of both the opposing faces.   The light scattering process includes a surface roughening process, a process of printing a predetermined light diffusion pattern with an ink containing a light diffusing pigment as a component, a fine processing process for forming a plurality of concave parts for diffusing light, and a fine protrusion. The planar light-emitting device according to claim 2, wherein the planar light-emitting device is one of forming processes. It said light scattering means, the planar light emitting device according to any one of claims 1 to 3 you characterized by scattering light enough away from the light-emitting layer of a light-emitting element adjacent.

Images