WO2018173495A1

WO2018173495A1 - Light emitting sheet

Info

Publication number: WO2018173495A1
Application number: PCT/JP2018/003195
Authority: WO
Inventors: 峻濱口; 夏樹山本
Original assignee: コニカミノルタ株式会社
Priority date: 2017-03-23
Filing date: 2018-01-31
Publication date: 2018-09-27
Also published as: JPWO2018173495A1; JP2022174230A

Abstract

Provided is a light emitting sheet capable of light emission display without being connected to an external power source. A light emitting sheet (1A) comprises a base material (10), upon which is provided: a sheet battery (20), an organic EL element (30) which emits light using power from the sheet battery (20), and a switch (50) which can switch between a state in which the sheet battery (20) and the organic EL element (30) are electrically connected, and a state in which the sheet battery (20) and the organic EL element (30) are cut off from each other.

Description

Luminescent sheet

The present invention relates to a light emitting sheet using an organic EL element.

In recent years, advertising bodies and the like that are configured to be capable of surface light emission using EL elements have become widespread (see Patent Documents 1 to 3).

JP 2002-31865 A International Publication No. 2004/064020 JP 2012-160397 A

However, since the inventions described in Patent Documents 1 to 3 require power supply from an external power source, there is a limitation in the form of use.

This invention is made | formed in view of the said point, and makes it a subject to provide the light emission sheet which can perform a light emission display without the connection with an external power supply.
It is an issue to provide.

The present invention for solving the above-described problems has the following configuration.
1. A base material, a sheet battery provided on the base material, an organic EL element provided on the base material and emitting light by power from the sheet battery, and provided on the base material, the sheet A light emitting sheet comprising: a switch capable of switching between a state in which a battery and the organic EL element are electrically connected and a state in which the battery is disconnected.
2. 2. The light-emitting sheet according to 1, wherein the light-emitting sheet includes a display sheet that covers the organic EL element and includes a light transmission portion that can transmit light emitted from the organic EL element.
3. 3. The light emitting sheet according to 2, wherein a peak wavelength of light transmitted through the light transmission part is set within 30 nm from a peak wavelength of an emission spectrum of the organic EL element.
4). 4. The light emitting sheet according to 2 or 3, further comprising a light shielding sheet provided between the display sheet and the base material and having an opening through which light emitted from the organic EL element passes.
5). 2. The light emitting sheet according to 1 above, wherein the organic EL element is patterned by ultraviolet irradiation.
6). 2. The light-emitting sheet according to 1 above, wherein the sheet battery is provided on a surface of the substrate opposite to a surface on which the organic EL element is provided.
7). The sheet battery is provided on the same surface as the surface on which the organic EL element is provided of the base material, and is disposed on the opposite side of the organic EL element by bending the base material. 2. The light emitting sheet according to 1 above.
8). The switch includes a switch-side conductor that can move relative to the base material in a direction intersecting the surface of the base material, and the switch-side conductor contacts a base-material side conductor provided on the base material. The light-emitting sheet according to 1 above, wherein the sheet battery and the organic EL element are electrically connected.

According to the present invention, light emission display can be performed without connection to an external power source.

It is a disassembled perspective view which shows typically the light emission sheet which concerns on 1st embodiment of this invention. 1 is an exploded perspective view schematically showing a switch according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view schematically showing the light-emitting sheet according to the first embodiment of the present invention, and is a cross-sectional view taken along the line III-III in FIG. It is sectional drawing which shows typically the light emitting sheet which concerns on 2nd embodiment of this invention. It is a disassembled perspective view which shows typically the light emission sheet which concerns on 3rd embodiment of this invention. FIG. 6 is a cross-sectional view schematically showing a light emitting sheet according to a third embodiment of the present invention, and is a cross-sectional view taken along line VI-VI in FIG. It is a disassembled perspective view which shows typically the light emission sheet which concerns on 4th embodiment of this invention. FIG. 8 is a cross-sectional view schematically showing a light emitting sheet according to a fourth embodiment of the present invention, and is a cross-sectional view taken along line VIII-VIII in FIG.

Embodiments of the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted. The light emitting sheet of the present invention can be applied to a pamphlet, a product packaging container, and the like, and can emit a desired design (characters, numbers, figures, etc.) for advertising a product, for example. In the following drawings, the cross-sectional view schematically shows the laminated state of each sheet or the like, and does not accurately represent the relationship of the film thickness of each sheet or the like. In addition, regarding each sheet and the like, the front side surface (the side where the organic EL element 30 of the base material 10 is provided, the display sheet 70 side) will be described as one surface, and the back surface will be described as the other surface. Further, “transparency” in the present invention means that light (visible light) emitted by the organic EL element 30 is transmitted to an extent that can be visually recognized by the user.

<First embodiment>
As shown in FIGS. 1 and 3, the light emitting sheet 1 A according to the first embodiment of the present invention is formed to have a thickness of, for example, 500 μm or less, has flexibility, and comes from a power source that it has. It is a sheet that emits light to the front side by power supply (voltage application). The light emitting sheet 1 A includes a base material 10, a sheet battery 20, an organic EL (Electro Luminescence) element (OLED: Organic Light Emitting Diode) 30, a wiring 40, a switch 50, a light shielding sheet 60, and a display sheet 70. .

<Base material>
The substrate 10 is a sheet-like support on which the sheet battery 20, the organic EL element 30 and the wiring 40 are provided. The base material 10 can be formed of paper having flexibility and non-conductivity (insulating properties), a resin film, or the like. The base material 10 may not have transparency.

In the base material 10, a weak part (for example, perforation) 10a is formed so as to surround the sheet battery 20. The base material 10 can be cut off at the fragile portion 10a.

A switch position notification unit 10b (see FIG. 3) is formed in a portion corresponding to the switch 50 on the other surface of the base material 10. The switch position notification unit 10b is for informing the user of the position of the switch 50, and can be formed by, for example, applying a colorant to the other surface of the base material 10.

<Sheet battery>
The sheet battery 20 is provided on one surface of the substrate 10 and is a power source that supplies power to the organic EL element 30 in order to cause the organic EL element 30 to emit light. The sheet battery 20 is fixed to one surface of the base material 10 with an adhesive (not shown). The sheet battery 20 can be formed of a polymer battery or the like.

<Organic EL device>
The organic EL element 30 is an element that is provided on one surface of the substrate 10 and emits light by electric power supplied from the sheet battery 20. The organic EL element 30 emits surface light in a region larger than

openings

60a and 71a described later. The organic EL element 30 is fixed to one surface of the base material 10 with an adhesive (not shown). In the present embodiment, from the viewpoint of cost reduction, the organic EL element 30 includes, as an organic layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer in order from the substrate 10 side. It has 5 layers. The hole injection layer is electrically connected to the anode electrode of the organic EL element 30, and the electron injection layer is electrically connected to the cathode electrode of the organic EL element 30. Further, the organic EL element 30 includes a gas barrier layer, an inorganic layer, a sealing layer formed by ALPET (aluminum foil PET (PolyEthylene Terephthalate resin) composite film), and the like, in addition to the above-described organic layer and electrode. In the organic EL element 30, when power is supplied from the sheet battery 20, the electrons via the electron injection layer and the electron transport layer and the holes via the hole injection layer and the hole transport layer are combined in the light emitting layer. It emits light. The organic layer of the organic EL element 30 is not limited to the five-layer structure described above, and may be configured to include an electron blocking layer, a hole blocking layer, and the like.

<Wiring>
The wiring 40 is provided on one surface of the base material 10 and is used for electrically connecting the sheet battery 20 and the organic EL element 30 via the switch 50. The wiring 40 can be formed by applying conductive ink to one surface of the substrate 10 or attaching a conductive tape to one surface of the substrate 10.

In the present embodiment, the wiring 40 includes conducting

wires

41, 42, and 43 as the base-side conducting wires. One end portion of the conducting wire 41 is electrically connected to one electrode (for example, a positive electrode) of the sheet battery 20, and the other end portion of the conducting wire 41 extends to the switch 50. One end of the conducting wire 42 is electrically connected to the other electrode (for example, the negative electrode) of the sheet battery 20, and the other end of the conducting wire 42 is connected to one electrode (for example, the cathode) of the organic EL element 30. Electrically connected. One end of the conducting wire 43 is electrically connected to the other electrode (for example, an anode) of the organic EL element 30, and the other end of the conducting wire 43 extends to the switch 50.

Each electrode of the sheet battery 20 and each electrode of the organic EL element 30 are electrically connected to each of the conductive wires 41 to 43 through an adhesive (an anisotropic conductive film having adhesiveness) having conductivity in the film thickness direction. Is done.

<Switch>
The switch 50 is provided on one surface side of the base material 10 (that is, between the base material 10 and the light shielding sheet 60), a connection state in which power from the sheet battery 20 is supplied to the organic EL element 30, and a sheet battery. It is configured to be able to switch between a disconnected state in which power supply from 20 to the organic EL element 30 is cut off. In the present embodiment, the switch 50 is in a disconnected state in a non-operating state (non-pressed state), and is in a connected state in an operating state (pressed state). As shown in FIG. 2, the switch 50 includes a pair of

girder parts

51, 51, a ceiling part 52, and a conducting wire 53.

The pair of

girders

51 and 51 are provided on one surface of the base material 10 so as to intersect with the other ends of the

conductive wires

42 and 43. A pair of

girder parts

51 and 51 are being fixed to one side of substrate 10 with an adhesive which is not illustrated. The pair of

girders

51 and 51 can be formed of non-conductive (insulating) paper, resin film, or the like.

The ceiling part 52 is constructed by a pair of

girder parts

51 and 51. The ceiling portion 52 is fixed to the pair of

girder portions

51 and 51 with an adhesive (not shown). The ceiling portion 52 can be formed of non-conductive (insulating) paper, resin film, or the like.

The conducting wire 53 is switch-side conductivity provided on the other surface of the ceiling portion 52 (surface on the base material 10 side). The conducting wire 53 can be formed by applying conductive ink to the other surface of the ceiling portion 52 or attaching a conductive tape to the other surface of the ceiling portion 52. The thickness of the conducting wire 53 is set smaller than the thickness of the pair of

girder portions

51, 51. One end portion of the conducting wire 53 is arranged to face the other end portion of the conducting wire 41, and the other end portion of the conducting wire 53 is arranged to face the other end portion of the conducting wire 43. Moreover, the conducting wire 53 is configured to be relatively movable with respect to the substrate 10 (substrate-side conducting wires 41 and 43) in a direction intersecting the surface of the substrate 10. That is, the conducting wire 53 is normally separated from the base material

side conducting wires

41 and 43 and contacts the base material

side conducting wires

41 and 43 when the user operates the switch 50.

<Light-shielding sheet>
As shown in FIGS. 1 and 3, the light shielding sheet 60 is a sheet that blocks light unnecessary for display out of the light emitted by the organic EL element 30. The light shielding sheet 60 is a sheet that has the same shape and the same size as the base material 10 in a front view, and is provided on one surface of the base material 10. The peripheral edge of the light shielding sheet 60 is fixed to the peripheral edge of the substrate 10 by the adhesive 2. The light shielding sheet 60 can be formed of paper having flexibility and non-conductivity (insulating properties), a resin film, or the like. The light shielding sheet 60 does not have transparency and is desirably colored, particularly black.

An opening 60 a is formed at a portion overlapping the surface light emitting region of the organic EL element 30 in the front view of the light shielding sheet 60. The opening 60a imitates a design (characters, numbers, figures, etc.) to be displayed by the light emitting sheet 1A.

<Display sheet 70>
The display sheet 70 is a sheet that has the same shape and the same size as the base material 10 and the light shielding sheet 60 in a front view, and is provided on one surface of the light shielding sheet 60. As shown in FIG. 3, the display sheet 70 is a sheet that displays a desired design (characters, numbers, figures, etc.) by the light emitted by the organic EL element 30. The display sheet 70 includes a display sheet main body 71 and a translucent sheet 72.

≪Display sheet body≫
The display sheet main body 71 is provided so as to overlap one surface of the light shielding sheet 60. The peripheral edge of the display sheet main body 71 is fixed to the peripheral edge of the light shielding sheet 69 with an adhesive. The display sheet main body 71 can be formed of flexible and non-conductive (insulating) paper, a resin film, a cloth, or the like. The display sheet main body 71 does not have transparency.

An opening 71 a is formed in a portion overlapping the surface light emitting region of the organic EL element 30 in a front view of the display sheet main body 71. The opening 71a imitates the design (characters, numbers, figures, etc.) to be displayed by the light emitting sheet 1A, and has the same shape as the opening 60a described above.

≪Translucent sheet≫
The light transmissive sheet 72 is an example of a light transmissive portion that can transmit light emitted from the organic EL element 30, and is provided on the other surface of the display sheet main body 71 so as to close the opening 71 a. . The peripheral edge of the translucent sheet 72 is fixed to the other surface of the display sheet main body 71 by an adhesive (not shown). The translucent sheet 72 can be formed of a resin film having flexibility and non-conductivity (insulation). The translucent sheet 72 has transparency.

The translucent sheet 72 may be colorless and transparent or colored and transparent. In the case of being colored and transparent, it is desirable that the peak wavelength of the light transmitted through the translucent sheet 72 is set within 30 nm from the peak wavelength of the emission spectrum of the organic EL element 30. For example, when a red transparent film is employed as the translucent sheet 72, a material that emits red light having a peak wavelength in red is preferably used as the organic EL element 30.

<Operation example>
Subsequently, an operation example of the light emitting sheet 1A according to the first embodiment of the present invention will be described in the order of the light emitting operation and the sheet battery replacement.

≪Light emission operation≫
When the user presses the switch position notifying unit 10b from the other side (arrow X1 in FIG. 3), the conductive wire 53 on the switch 50 side and the

conductive wires

41 and 43 on the base material 10 side are electrically connected. Thereby, the electric power from the sheet battery 20 is supplied to the organic EL element 30, and the organic EL element 30 emits light. The light emitted by the organic EL element 30 passes through the light transmitting sheet 72 of the display sheet 70, whereby the light emitting sheet 1A emits and displays a desired design (characters, numbers, figures, etc.) (arrow X2 in FIG. 3). ).

≪Replacement of sheet battery≫
When it becomes necessary to replace the sheet battery 20 due to long-term use of the light emitting sheet 1A, the user cuts a part of the base material 10 (part where the sheet battery 20 is provided) at the fragile portion 10a. Replace 20 For example, the original sheet battery 20 (and a part of the conducting wires 41 and 42) is separated together with a part of the base material 10. Subsequently, the user prepares a new sheet battery 20 and a part of the conductive wires 41 and 42 (for example, made of conductive tape), and electrically connects a part of the

conductive wires

41 and 42 to the existing

conductive wires

41 and 42, respectively. While connecting, a part of new sheet battery 20 and conducting

wires

41 and 42 are covered with another base material. The sheet battery 20, the

conductive wires

41 and 42, the exposed peripheral edge of the light shielding sheet 60, and the edge of the notch formed by cutting the original base material 10 are attached to another base material with an adhesive. It is done.

Since the light emitting sheet 1A according to the first embodiment of the present invention can cause the organic EL element 30 to emit light by the electric power from the sheet battery 20, connection with an external power source can be made unnecessary.
Further, since the light emitting sheet 1A includes the switch 50, it is possible to suitably switch ON / OFF of the light emission display.
Moreover, since the base material 10, the light-shielding sheet 60, and the display sheet 70 are formed of paper, a film, or the like, the light-emitting sheet 1A can suitably achieve a reduction in thickness, weight, and flexibility. Further, the light emitting sheet 1A can be easily manufactured at a low cost.

Moreover, since the display sheet 70 has the light transmission part (the opening part 71a and the light transmission sheet 72), the light emitting sheet 1A suitably emits a desired design (characters, numbers, figures, etc.) with a simple configuration. Can be displayed.

Moreover, since the peak wavelength of the light which permeate | transmits the translucent sheet | seat 72 is set within 30 nm from the peak wavelength of the emission spectrum of the organic EL element 30, the light emitting sheet 1A loses the light emitted by the organic EL element 30. A suitable light-emitting display can be performed without doing so.

In addition, since the light-emitting sheet 1 A is provided with the light-shielding sheet 60 between the base material 10 and the display sheet 70, the light emitted by the organic EL element 30 passes through the display sheet 70 other than the light transmission portion. Brightening can be prevented and suitable light emission display can be performed.

Further, the light emitting sheet 1 A constitutes the switch 50 with a simple structure, and a suitable light emitting display can be performed only by pressing the switch 50 by the user.

<Second Embodiment>
Subsequently, the light emitting sheet according to the second embodiment of the present invention will be described focusing on differences from the light emitting sheet 1A according to the first embodiment. As shown in FIG. 4, in the light emitting sheet 1 B according to the second embodiment of the present invention, the sheet battery 20 is provided on the other surface of the substrate 10. Moreover, the conducting

wires

41 and 42 are provided from one surface of the base material 12 to the other surface so as to be electrically connected to the sheet battery 20. The conducting

wires

41 and 42 can be formed by attaching a conductive tape from one surface of the base material 10 to the other surface. Further, the weakened portion 10 a is not formed on the base material 10.

<Operation example / sheet battery replacement>
When it becomes necessary to replace the sheet battery 20 due to long-term use of the light emitting sheet 1B, the user replaces the sheet battery 20 exposed on the back side of the light emitting sheet 1B. That is, the user removes the sheet battery 20 from the base material 10, electrically connects the new sheet battery 20 to the

conductors

41 and 42, and attaches the sheet battery 20 to the original sheet battery 20 using an adhesive.

The light emitting sheet 1B according to the second embodiment of the present invention can improve the exchangeability of the sheet battery 20.

<Third embodiment>
Subsequently, the light emitting sheet according to the third embodiment of the present invention will be described focusing on differences from the light emitting sheet 1A according to the first embodiment. As shown in FIGS. 5 and 6, in the light emitting sheet 1 C according to the third embodiment of the present invention, the base material 10 is formed larger than the light shielding sheet 60 and the display sheet 70, and the folding margin 10 c is formed. Have. Part of the sheet battery 20 and the

conductive wires

41 and 42 is formed on one surface of the base material 10 and on one surface of the folding margin 10c. The folding margin portion 10 c is folded to the other surface side of the base material 10, and the other surface of the main body portion of the base material 10 and the other surface of the folding margin portion 10 c are fixed by the adhesive 4. Further, the weakened portion 10 a is not formed on the base material 10.

<Operation example / sheet battery replacement>
When it becomes necessary to replace the sheet battery 20 due to long-term use of the light emitting sheet 1C, the user replaces the sheet battery 20 exposed on the back side of the light emitting sheet 1C. That is, the user removes the sheet battery 20 from the base material 10, electrically connects the new sheet battery 20 to the

conductors

The light-emitting sheet 1C according to the third embodiment of the present invention can improve the exchangeability of the sheet battery 20 without reducing the productivity of the wiring 40.

<Fourth embodiment>
Subsequently, a light emitting sheet according to the fourth embodiment of the present invention will be described focusing on differences from the light emitting sheet 1A according to the first embodiment. As shown in FIG. 7, the light emitting sheet 1 D according to the fourth embodiment of the present invention includes a light transmitting sheet 80 instead of the light shielding sheet 60 and the display sheet 70.

The translucent sheet 80 is a sheet having the same shape and the same size as the substrate 10 in a front view, and is provided on one surface of the substrate 10. The peripheral edge of the translucent sheet 80 is fixed to the peripheral edge of the substrate 10 by the adhesive 2. As this translucent sheet | seat 80, the film similar to the above-mentioned translucent sheet | seat 72 is used suitably.

Further, the organic EL element 30 is patterned by UV irradiation. That is, in the organic EL element, a portion not irradiated with ultraviolet rays is a light emitting region 31, and a portion irradiated with ultraviolet rays is a non-light emitting region 32. The light emitting area 31 is similar to the

openings

60a and 71a described above, and imitates the design (characters, numbers, figures, etc.) to be displayed.

<Operation example / Light emission operation>
When the user presses the switch position notifying unit 10b from the other side (arrow X1 in FIG. 8), the conductive wire 53 on the switch 50 side and the

conductive wires

41 and 43 on the base material 10 side are electrically connected. Thereby, the electric power from the sheet battery 20 is supplied to the organic EL element 30, and the light emitting region 31 of the organic EL element 30 emits light. When the light emitted from the light emitting region 31 of the organic EL element 30 is transmitted through the light transmitting sheet 80, the light emitting sheet 1D emits and displays a desired design (characters, numbers, figures, etc.).

Since the light-emitting sheet 1D according to the fourth embodiment of the present invention does not require the light-shielding sheet 60 and the display sheet 70, the light-emitting sheet 1D can more suitably realize a reduction in thickness, weight, and flexibility.

As mentioned above, although embodiment and the modification of this invention were demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, the light emitting sheet 1D according to the fourth embodiment may have a configuration in which the organic EL element 30 is not patterned by UV irradiation. In this case, a member corresponding to the light shielding sheet 60 and the display sheet 70 of the first embodiment is provided on an object (pamphlet, packaging container, or the like) to which the light emitting sheet 1D is attached, so that a desired design is achieved. Can be displayed in a light-emitting manner.

Further, the light emitting sheets 1A to 1D may be configured to include a plurality of organic EL elements 30 having different emission colors. In this case, it is desirable that a light transmission portion in which the peak wavelength of transmitted light is set within 30 nm from the peak wavelength of the emission spectrum of the organic EL element 30 is provided corresponding to each organic EL element 30. Such a configuration is applicable when a plurality of light transmission parts are separated by, for example, 4 mm or more.

Further, the

adhesives

2 and 3 may be provided over the entire base 10 and the respective sheets 60 and 70. In addition, the switch position notification unit may be formed on one surface of the display sheet 70. Further, the switch position notifying unit may be a concavo-convex part or the like formed on the base material 10 and / or the display sheet 70 by embossing.

1A, 1B, 1C, 1D Light emitting sheet 10 Base material 20 Sheet battery 30 Organic EL element 50 Switch 60 Light shielding sheet 70 Display sheet 71a Opening (light transmission part)
72 Translucent sheet (light transmission part)

Claims

A substrate;
A sheet battery provided on the substrate;
An organic EL element that is provided on the base material and emits light by electric power from the sheet battery;
A switch that is provided on the base material and is capable of switching between a state in which the sheet battery and the organic EL element are electrically connected and a state in which the sheet battery is disconnected;
A light emitting sheet comprising:
The light-emitting sheet according to claim 1, further comprising a display sheet that covers the organic EL element and includes a light transmission part capable of transmitting light emitted from the organic EL element.
The light emitting sheet according to claim 2, wherein a peak wavelength of light transmitted through the light transmitting portion is set within 30 nm from a peak wavelength of an emission spectrum of the organic EL element.
The light emitting sheet according to claim 2 or 3, further comprising a light shielding sheet provided between the display sheet and the base material and having an opening through which light emitted from the organic EL element passes.
The light emitting sheet according to claim 1, wherein the organic EL element is patterned by ultraviolet irradiation.
The light-emitting sheet according to claim 1, wherein the sheet battery is provided on a surface of the substrate opposite to a surface on which the organic EL element is provided.
The sheet battery is provided on the same surface as the surface on which the organic EL element is provided of the base material, and is disposed on the opposite side of the organic EL element by bending the base material. The luminescent sheet according to claim 1.
The switch includes a switch-side conductor that can move relative to the base material in a direction intersecting the surface of the base material, and the switch-side conductor contacts a base-material side conductor provided on the base material. The luminescent sheet according to claim 1, wherein the sheet battery and the organic EL element are electrically connected.