JP2018032467A - Planar light emitting body module and seal material for tiling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce high luminance light emission generated between adjacent light emitting sheet panels even when a planar light emitting body module is formed by arranging a plurality of planar light emitting sheet panels side by side.SOLUTION: A planar light emitting body module includes a flexible planar light emitting sheet which has a planar light emitting region, and a non-light emitting region arranged in the periphery of the light emitting region and including an electrode terminal take-out part or a sealing region. At least one part of the non-light emitting region forms a rear bent part which is formed by being bent in a sheet rear surface direction which is a non-light emitting surface of the planar light emitting sheet. The planar light emitting body module has a plurality of planar light emitting sheet panels 6 having a side inclined surface light emitting part in which a normal direction of the surface is changed by the formation of the rear bent part in the surface light emitting region, and the adjacent planar light emitting sheet panels 6 are arranged side by side so that the side inclined surface light emitting parts are close to each other or in contact. At a recess 5 formed between the side inclined surface light emitting parts of the adjacent planar light emitting sheet panels, a light absorbing seal material 8 is provided in which the surface coming into contact with the side inclined surface light emitting part for forming the recess 5 is made of a sticky surface or an adhesive surface.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a surface light emitting module tiling a flexible surface light emitting sheet panel, and a tiling sealing material used therefor.

2. Description of the Related Art In recent years, surface-emitting illumination devices using organic electroluminescence (EL) elements as light sources have attracted attention because of their high luminous efficiency, brightness, thinness, and direct current low voltage drive. High-brightness, high-efficiency organic EL elements often use a vacuum thin film process to form organic light-emitting layers, carrier transport layers, electrode layers, etc., making it easy to produce a large metric-sized panel without defects is not. In addition, it is not easy to form a light emitting element on a three-dimensional curved substrate such as a spherical surface.
For this reason, when using a surface emitting sheet or surface emitting panel on a large wall surface of a building or a curved surface such as a globe with a diameter of metric size, tiling to attach a surface emitting sheet or panel smaller than the object side by side A surface light emitter module is formed by this method.

In patent document 1, the electrode terminal extraction part of the non-light-emitting area formed on the four sides around the light-emitting area of the organic EL sheet formed on the flexible substrate is bent downward to fix the electrode terminal part. Adjacent large area light emitting modules are formed.
However, in Patent Document 1, each surface emitting sheet is connected and fixed to a socket provided on a wiring board under the sheet, so that adjacent surface emitting sheet panels are not integrated. For this reason, a clearance gap may arise between surface emitting sheet panels, or a module may become thick. In addition, since the surface-emitting sheet panel cannot stand alone, there is a problem that it is difficult to manufacture a large-area, three-dimensional and flexible surface-emitting module.

  In addition, between the adjacent surface emitting sheet panels, there is a recess sandwiched between side inclined light emitting portions generated at the end of each panel, and the light amount per unit area viewed from the vertical direction from the main light emitting portion on the upper surface in the recess. Increase. For this reason, in the case of a surface light emitting module in which a large number of surface light emitting sheet panels are two-dimensionally arranged, there is a problem that the area between the panels shines brighter than the main light emitting surface in a lattice shape. For example, in the case of bluish-white light emission having a high color temperature of light emission of the surface light emitting sheet panel, when the luminance of the concave region which is a joint between the panels is increased, the color tone of the portion looks brighter and white, and the light emission becomes uneven.

Japanese Patent No. 4717946

  In view of the circumstances as described above, the present invention reduces high-intensity light emission generated in an area between adjacent light emitting sheet panels even when a plurality of surface light emitting sheet panels are juxtaposed to form a surface light emitter module. With the goal.

In order to solve the problem, one embodiment of the present invention is a flexible surface light-emitting device including a surface light-emitting region and a non-light-emitting region that is disposed around the surface light-emitting region and includes an electrode terminal extraction portion or a sealing region. A sheet is provided, and at least a part of the non-light emitting area forms a back bent portion formed by bending in the sheet back surface direction which is a non-light emitting surface of the surface light emitting sheet, and the back bent portion is formed in the surface light emitting area. A surface light emitter having a plurality of surface light emitting sheet panels having side slope light emitting portions whose normal direction of the surface is changed by the above, and the adjacent surface light emitting sheet panels arranged side by side in close proximity or in contact with each other. In the module
The concave portion formed between the side slope light emitting portions of the adjacent surface light emitting sheet panels is provided with a sealing material in which the surface in contact with the side slope light emitting portion forming the concave portion is an adhesive surface or an adhesive surface. And

According to one embodiment of the present invention, it is possible to provide a surface light emitter module having a large area while uniforming light emission by reducing high luminance light emission in a region between each surface light emitting sheet panel.
For example, by applying the aspect of the present invention, a flexible surface emitting sheet panel tie having a surface light source element such as an organic EL element or an inorganic EL element sandwiched between a flexible substrate and a flexible sealing substrate. A large-area surface light emitter module using a ring, a large-area surface light emitter module integrated with uniform non-light-emitting areas in the gaps between the respective surface light-emitting panels and uniform light emission, and a three-dimensional shape The surface light emitter module can be provided.

It is a schematic diagram which shows the example of a shape of the surface emitting sheet used for a surface emitting sheet panel. It is a schematic diagram which shows an example of the cross section of a surface emitting sheet panel. It is a schematic diagram at the time of seeing from the light emission surface the surface light emitter module which arranged by bending and tiling at least one end of a surface light emission sheet panel to the back. FIG. 4 is a schematic view showing the A-A ′ cross section of the surface light emitting module of FIG. 3 in which at least one end of the surface light emitting sheet panel is bent and tiled in the back direction, with the light emitting surface facing up. It is a schematic diagram which shows the example of the cross section of the minor axis direction of the sealing material of this embodiment of a tape form. A surface light emitter module in which at least one end of a surface light emitting sheet is bent in the back direction and a surface light emitting sheet panel is tiled. It is a schematic diagram of the cross section of a module. In a surface light emitter module obtained by tiling a surface light emitting sheet panel in which at least one end of the surface light emitting sheet is bent in the back direction, the surface light emitter module in which the sealing material of the present embodiment is arranged and bonded to the concave portion between the panels is viewed from above. FIG. 5A is a schematic diagram showing light emission, and FIG. 5B is a layout diagram of a sealing material of the present embodiment disposed in a recess between panels in a surface light emitter module. It is a schematic diagram which shows the cross section of the surface light emitter module which further laminated | stacked the light-diffusion sheet on the light emission surface of the surface light emitter module of this embodiment.

Embodiments of the present invention will be described with reference to the drawings.
<Surface emitting sheet>
The surface light emitting sheet is an organic EL sheet having an organic light emitting layer containing an organic phosphor or phosphor between a pair of electrodes on which a transparent substrate film is formed so that at least one electrode is translucent, or inorganic light emission It is composed of a flexible (flexible) sheet made of an inorganic dispersion type EL sheet having body particles.
The example of the planar shape of the surface emitting sheet processed into a surface emitting sheet panel is shown in FIG. The surface light-emitting sheet has a surface light-emitting region and a non-light-emitting region 3 disposed around the surface light-emitting region and including an electrode terminal extraction portion or a sealing region along the surface direction.
The surface light emitting region has a main light emitting surface 1 and a portion that becomes a side slope light emitting portion 2 located between the main light emitting surface 1 and the non-light emitting region 3. As shown in FIG. 1, examples of the shape of the main light emitting surface of the surface emitting sheet include polygons such as a triangle, a quadrangle, a pentagon, and a hexagon. Around the main light emitting surface 1, a portion that becomes a side slope light emitting portion 2 and a non-light emitting region 3 continuous therewith are formed in a flap shape.

<Surface emitting sheet panel>
As shown in FIG. 2, the surface light emitting sheet panel is a surface light emitting sheet for at least a part of the non-light emitting region 3 on the extension of the side slope light emitting portion 2 adjacent to the other light emitting sheet panel. It is set as the back bend part bent in the sheet | seat back surface direction which is a non-light-emitting surface. By forming the back bend portion, the portion that becomes the side slope light emitting portion 2 continuous to the non-light emitting region 3 changes to the side slope light emitting portion 2 in the normal direction of the surface.
The back bent portion is preferably formed in a state where the radius of curvature is in the range of 0.1 mm or more and 1.0 cm or less and 90 degrees or more in the sheet back surface direction, for example.
More preferably, it is formed in a state of being bent at 90 degrees or more and 180 degrees within a radius of curvature of 0.5 mm or more and 5.0 mm or less. If the radius of curvature is less than 0.1 mm, sharp bending may occur and the surface-emitting sheet may be broken. If the radius of curvature is 1 cm or more, the thickness of the surface-emitting module increases. If the bending is less than 90 degrees, a non-light emitting gap may be generated between the surface emitting sheet panels.

<Surface emitter module>
Here, in the following description, a case where the shape of the main light emitting surface 1 is a square shape will be described as an example.
As shown in FIGS. 3 and 4, the surface light emitter module has a plurality of surface light emitting sheet panels 6 such that the side slope light emitting portions of the adjacent surface light emitting sheet panels 6 are close to or in contact with each other. Constructed by juxtaposition.
In this state, the light beam is emitted from the side slope light emitting portion 2 at the position of the concave portion 5 formed between the side slope light emitting portions 2 of the adjacent surface light emitting sheet panels 6, and thus when viewed from the front rather than the main light emitting surface 1. Increases and the front brightness increases. As a result, as shown in the light emission image of the top view of FIG. 3, the recesses between the panels appear brighter than the main light emission surface 1, and in the example of FIG. 3, the recesses 5 are arranged in a lattice pattern. Therefore, it looks bright and shining in a grid pattern.

On the other hand, in the surface light emitter module of this embodiment, the sealing material 8 as shown in FIG. 5 is fitted into the concave portion 5 on the light emitting surface side as shown in FIG. The structure is filled with the sealing material 8.
The sealing material 8 is adjacent to the side slope light emitting portion 2, which is in contact with the side slope light emitting portion 2. The adhesive surface or adhesive surface is attached to the side slope light emitting portion 2. The side slope light emitting portions 2 are joined together, that is, the adjacent surface emitting sheet panels 6 are joined.
Here, the cross-sectional shape of the concave portion 5 is a substantially inverted triangular shape in which the width decreases toward the bottom of the concave portion 5 or a reverse Fuji mountain shape in which the width decreases nonlinearly toward the bottom of the concave portion 5. It is the shape of. The sealing material 8 also preferably has a shape following that shape.

The sealing material 8 includes a base 9 made of a base film or a resin, and an adhesive or an adhesive that is attached to the lower side of the base 9 and has a shape whose width becomes narrower as the cross section goes toward the bottom of the recess. When the upper surface of the substrate 9 is provided in the recess 5, it is preferable to form a surface parallel to the juxtaposition direction of the plurality of surface emitting sheet panels 6.
Here, FIG. 5 is an example of a cross-sectional shape in the minor axis direction, and the sealing material 8 is a tape-like member and has a shape that can be attached along the recess.
The sealing material 8 shown in FIGS. 5a and 5b is formed by forming a layer of an adhesive material or an adhesive material 11 on the lower surface (surface on the concave side) of the base 9 that is a base film so as to have a triangular cross-sectional shape. It is an example that is configured. The sealing material 8 shown in FIG. 5c is configured by forming a layer of an adhesive material or an adhesive material 11 on the surfaces of two sides in contact with the concave portion 5 on the light emitting surface side in the base body 9 made of a substantially triangular base resin. It is an example.

The substrate 9 is made of, for example, polyester, polypropylene, triacetyl cellulose, polyvinyl acetate resin, acrylic resin, or other resin.
As the adhesive material or the adhesive material, a transparent material such as silicone, acrylic, urethane, or epoxy can be used. Furthermore, a release paper can be bonded to the adhesive surface or the adhesive surface and peeled off at the time of use.
In the example of the sealing material 8 in FIG. 5a, the film-like or sheet-like light-absorbing member 10 is arranged so as to be perpendicular to the center of the base 9 made of the base film (a direction parallel to the direction along the recess). doing. In this case, the light absorbing member 10 absorbs the average light absorptance in the visible light range in the range of 10% to 80% with respect to the direction parallel to the main light emitting surface of the surface light emitting sheet panel. When the sealing material 8 is attached to the recess 5, the layer made of the light-absorbing member 10 absorbs part of the light emitted from the side slope light emitting portion 2, so that the front luminance of the recess 5 is the main light emitting surface. It can suppress becoming higher than the front luminance of 1. And since the cross-sectional area of the light absorption member 10 seen from the front is small, even when the surface light emitter module 7 does not emit light, the presence of the light absorption member 10 is not conspicuous. The light-absorbing member 10 is made of a polarizing film having a thickness of 0.2 mm or less, a light-absorbing translucent material containing a mixed dye or pigment of black, yellow, cyan, or magenta, and made of the same material as the substrate 9. A resin film can be preferably used.

Further, the pressure-sensitive adhesive material or the adhesive material 11 itself used in FIG. 5b can be used as a light-absorbing member. Further, the base 9 itself made of the base resin shown in FIG. 5c can be used as a light absorbing member. In that case, the average light absorptance of the light-absorbing member 10 in the visible light wavelength range is 10% including the light absorption of the base film 9 or the resin substrate 9 with respect to the direction perpendicular to the main light-emitting surface of the surface-emitting sheet panel. It is desirable to use a material having a member of 80% or less.
A material having a low light absorption rate is used when the radius of curvature of the side slope light emitting portion is small and the depth of the recess 5 is shallow, and a material having a high light absorption rate has a large radius of curvature of the side slope light emitting portion and the depth of the recess 5. Used when deep. In this case, when a material having a light absorption rate of less than 10% is used, the high luminance between the surface light emitting sheet panels is not noticeable and it is difficult to obtain the effect of using a light absorbing member. On the other hand, when a material having a light absorption rate larger than 80% is used, the seam is conspicuous when the surface light emitter module is not lit. Therefore, a more preferable light absorption rate is 30% or more and 60% or less.

  The concave portion 5 on the light emitting surface side between the surface light emitting sheet panels 6 is filled with the sealing material 8 provided with the light absorbing member 10, and the gap portion 14 (see FIG. 3) where the concave portions intersect is covered and joined. At that time, the sealing material is also covered on the gap portion 14, and the base material and the refractive material are refracted near the surface of the adhesive material or the adhesive 11 layer of the sealing material 8 corresponding to the position of the gap portion 14 and the non-light emitting sealing region. Luminance of the non-light-emitting portion is obtained by attaching light-scattering particles having different rates or roughening the surface and scattering light emitted from the side-slope light-emitting portion that has propagated through the sealing material 8 on the non-light-emitting portion such as the gap. It is also possible to obtain more uniform surface light emission.

FIG. 7A shows a schematic diagram of the state of light emission when the light emitting surface of the surface light emitter module 7 is viewed from the front. Moreover, the pattern of the stuck sealing material 8 is shown in FIG.
The sealing material of this embodiment can suppress the increase in luminance of the region of the concave portion 5 between the surface light emitting sheet panels and can compensate for the low luminance of the gap portion, thereby obtaining a more uniform light emitting tiling panel.
In addition, it is desirable that the outer surface of the substrate 9 should not be sticky in terms of handling and the ease of performing the work of applying a sealing material.
Further, as shown in FIG. 8, a light diffusing sheet 13 can be attached to the light emitting surface of the surface light emitter module via an adhesive layer or an adhesive layer 12 to achieve more uniform surface light emission.

The light diffusion sheet 13 is formed of a resin foam sheet, a resin sheet in which inorganic particles having a high refractive index are dispersed, a prism lens sheet, or the like alone or laminated.
The integrated surface light emitter module 7 is electrically connected to a control device provided with a power source, a switch, a drive circuit and the like by electrically connecting the terminal portions of the surface light emitting sheet panel 6 included in the surface light emitter module 7. By connecting, each surface light emitting sheet panel can be caused to emit light in conjunction with another surface light emitting module 7, light can be caused to blink, or light can be emitted in various light emission patterns at the same time.

  In addition, according to the embodiment, a surface emitting sheet panel having a polygonal main light emitting surface such as a triangle, a quadrangle, a pentagon, a hexagon, and the like is tiling-joined to form a polyhedral solid, a soccer ball shape (from a pentagon shape and a hexagon shape). It is also possible to manufacture a flexible three-dimensional surface light emitter module such as a 32-face body or a sphere.

DESCRIPTION OF SYMBOLS 1 ... Main light emission surface 2 ... Side slope light emission part 3 ... Non-light emission area 4 ... Back surface 5 ... Recess 6 ... Surface emission sheet panel 7 ...・ Surface emitting body module 8... Sealing material 9... Base 10 ... Light-absorbing member 11 ... Adhesive material or adhesive material 12 ... Adhesive layer or adhesive layer 13 ... Light diffusion Sheet 14 ... gap

Claims (6)

A flexible surface-emitting sheet having a surface-emitting region and a non-light-emitting region disposed around the surface-emitting region and including an electrode terminal extraction portion or a sealing region, and at least a part of the non-light-emitting region is provided Forming a back bend portion that is bent in the sheet back surface direction, which is a non-light emitting surface of the surface light emitting sheet, and forming a side slope light emitting portion in which the normal direction of the surface is changed by the formation of the back bend portion in the surface light emitting region. In a surface light emitter module having a plurality of surface light emitting sheet panels, and adjacent surface light emitting sheet panels juxtaposed with each other's side slope light emitting portions in proximity or in contact with each other,
The concave portion formed between the side slope light emitting portions of the adjacent surface light emitting sheet panels is provided with a sealing material in which the surface in contact with the side slope light emitting portion forming the concave portion is an adhesive surface or an adhesive surface. Surface emitting module.   2. The surface light emitting device according to claim 1, wherein the back bent portion is formed in a state in which a radius of curvature is in a range of 0.1 mm or more and 1.0 cm or less and 90 degrees or more in the back surface direction of the sheet. module.   The sealing material has a base made of a base film or a resin, and an adhesive or an adhesive having a shape that is attached to the base and has a cross-section that becomes narrower toward the bottom of the recess. The surface emitting module according to claim 1 or 2.   The sealing material has an average light absorptance in a visible light wavelength range of 10% or more and 80% or less with respect to a direction parallel or perpendicular to a juxtaposition direction of the plurality of surface emitting sheet panels. The surface emitting module according to any one of claims 1 to 3. It is the said sealing material used for the surface emitting module described in any one of Claims 1-4,
A base made of a base film or a resin, and an adhesive or an adhesive having a shape that is formed on the base and has a cross-section that becomes narrower toward the bottom of the recess,
And a light-absorbing member having an average light absorptance in a visible light range of 10% to 80% with respect to a direction parallel to the juxtaposition direction of the plurality of surface emitting sheet panels. Seal material. It is the said sealing material used for the surface emitting module described in any one of Claims 1-4,
A base made of a base film or a resin, and an adhesive or an adhesive having a shape that is formed on the base and has a cross-section that becomes narrower toward the bottom of the recess,
And a light-absorbing member having an average light absorptance in a visible light range of 10% to 80% with respect to a direction perpendicular to the juxtaposition direction of the plurality of surface emitting sheet panels. Seal material.

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