JP2010135175A - Distributed inorganic electroluminescence panel and distributed inorganic electroluminescence complex panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distributed inorganic EL panel capable of displaying an image at the time of light emitting only and displaying a one-sheet image or a plurality of images in order by switching the one-sheet image or the plurality of images. <P>SOLUTION: In the distributed inorganic EL panel 1, a light-emitting body layer 12 and a patterned dielectric layer 10 are arranged between a rear electrode 15 and a front electrode 11. In a distributed inorganic EL complex panel, a structure wherein the light-emitting body layer 12 and the dielectric layer 10 are arranged between the rear electrode 15 and the front electrode 11 of the panel 1 is set up to be a unit, a plurality of units are piled up, the whole dielectric layer 10 and all electrodes excluding the most rear side electrode are transparent, and each unit can be independently light-emitted and/or light-quenched. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dispersion-type inorganic electroluminescence panel that does not display an image at the time of extinction but displays an image only at the time of light emission, and a dispersion-type inorganic electroluminescence composite panel in which a plurality of such panels are stacked.

A dispersion-type inorganic electroluminescence panel (dispersion-type inorganic EL panel) is useful as a backlight and can be manufactured by a simple process using printing technology. Therefore, a liquid crystal screen of a mobile phone, a backlight of a key, POP (Point of Purchase, Used in store advertising).
As a dispersion-type inorganic EL panel, for example, a light emitting layer and a high dielectric layer interposed between electrodes has been proposed. By filling a high dielectric fine powder with a high filling degree, light emission luminance can be achieved. Has been disclosed (see Patent Document 1).
In addition, an image display device (see Patent Document 2) in which a translucent panel on which an image is formed is superimposed on a dispersion-type inorganic EL panel, which is a light emitting light source, is disclosed. Such devices are mainly used.
JP 2004-259546 A JP-A-2005-70501

  However, in a conventional image display device using a dispersion-type inorganic EL panel as a light-emitting light source, a light-transmitting panel on which an image is formed in advance is used. The image can be recognized. In other words, the brightness of the image to be displayed simply changes due to light emission / extinction. For example, in POP, the advertising method could not be surprising. Further, it has been impossible to switch a plurality of images and display them sequentially. As described above, the conventional image display apparatus has a problem that the application is limited to a limited range.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dispersive inorganic EL panel that can display an image only at the time of light emission and can sequentially display one image or a plurality of images by switching.

As a result of intensive studies to solve the above problems, the present inventors have arranged a dielectric layer and a patterned dielectric layer in combination to provide a patterned dielectric layer during light emission. As a result, the present inventors have found a phenomenon in which the luminance changes at a certain part, thereby completing the present invention. In particular, the effect is enhanced by arranging the dielectric layers having different dielectric constants and / or different film thicknesses in combination.
That is, according to the present invention, there is provided a light emitting inorganic layer and a dielectric layer including one or more dielectric layers between a back electrode and a front electrode, and at least one of the dielectric layers is patterned. A luminescence panel is provided.
In addition, the present invention provides a dispersion inorganic electroluminescence panel according to the present invention in which a plurality of units are provided, with a unit in which a phosphor layer and one or more dielectric layers are provided between a back electrode and a front electrode. Dispersed inorganic electro, wherein all dielectric layers and all electrodes except the backmost side are transparent, and each unit is capable of independently emitting and / or quenching. A luminescent composite panel is provided.

  According to the present invention, an image can be displayed only during light emission. In addition, by disposing a plurality of dispersed inorganic EL panels and independently emitting and / or extinguishing each of them, a color image can be displayed by sequentially switching a plurality of images or simultaneously displaying RGB images. Can do.

The dispersed inorganic electroluminescence panel of the present invention is characterized in that a light emitting layer and one or more dielectric layers are provided between a back electrode and a front electrode, and at least one of the dielectric layers is patterned. To do.
In the present invention, a layer that emits light even if it is a dielectric is called a light emitter layer. A layer made of a dielectric material provided separately from the light emitting layer for causing the light emitting layer to emit light is called a dielectric layer.
Hereinafter, the present invention will be described in detail with reference to the drawings.

<Dispersed inorganic EL panel>
[First embodiment]
FIG. 1 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to the first embodiment of the invention. In the present embodiment, the provided dielectric layer is a single layer.
The dispersion-type inorganic EL panel 1 is configured by laminating a front electrode 11, a light emitter layer 12, a dielectric layer 10, and a back electrode 15 in this order. The dielectric layer 10 is patterned so as to form a desired image, and the light emitting layer 12 and the back electrode 15 are in contact with each other except the patterning portion.
The front electrode 11 is configured by laminating an electrode layer 11b on a base material 11a. In the present embodiment, the substrate 11a is a transparent substrate, the electrode layer 11b is a transparent electrode layer, and the front electrode is a transparent electrode.
An AC power supply 16 is connected between the electrode layer 11b and the back electrode 15, and the dispersion-type inorganic EL panel 1 emits light when an AC voltage is applied.

  As the material of the transparent substrate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polystyrene (PS), polyethylene (PE), polyarylate (PAR), polyetheretherketone ( Examples thereof include flexible polymers such as PEEK), polycarbonate (PC), polypropylene (PP), polyimide (PI), and triacetyl cellulose (TAC), and glass. Among these, glass is preferable.

The transparent electrode layer is a transparent conductive film made of a transparent oxide semiconductor, for example, and can be formed by a thin film forming method such as sputtering, CVD, spray pyrolysis deposition (SPD), or printing / coating. Transparent oxide semiconductors include indium tin oxide (ITO), fluorine-doped tin oxide (FTO), antimony-doped tin oxide (ATO), tin oxide (TO), fluorine-doped zinc oxide (FZO), aluminum-doped zinc oxide ( Examples thereof include AZO), gallium-doped zinc oxide (GZO), boron-doped zinc oxide (BZO), and zinc oxide (ZO).
Examples of the material for the transparent electrode layer include conductive polymers in addition to the oxide semiconductor. Specific examples thereof include polyaniline and polyethylenedioxythiophene (PEDOT). When these conductive polymers are used, it is particularly preferable to apply a printing / coating method.
Among these, an oxide semiconductor is preferable as the material for the transparent electrode layer.

The thickness of the base material 11a is preferably 10 to 250 μm, and particularly preferably 50 to 200 μm.
Although the thickness of the electrode layer 11b is not specifically limited, Usually, it is preferable that it is 5-500 nm.

  The electrode layer 11b may be formed by disposing a comb-like or grid-type metal and / or alloy fine wire on the substrate 11a and forming a conductive film thereon. This can improve the electrical conductivity. Preferred examples of the metal and alloy include copper, silver, aluminum, and nickel. In the case where metal and / or alloy fine wires are arranged, the distance between the fine wires is not too narrow and the width and height of the fine wires are not too large so that the light transmittance is not excessively reduced. It is preferable to ensure the above transmittance.

  The phosphor layer 12 is a layer formed by dispersing and containing inorganic phosphor particles. The inorganic luminescent material may be fine particles of a semiconductor usually used for an inorganic EL panel, and may be appropriately selected according to a necessary emission wavelength region. Specific examples include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, CaS, MgS, SrS, GaP, GaAs, and mixed crystals of two or more thereof, and ZnS is preferable.

  The binder resin used to disperse the inorganic phosphor particles is an active energy ray curable resin, a thermosetting resin, a heat drying resin (a resin that does not cause a reaction such as crosslinking and forms a film by drying the solvent) ) Can be used. Examples of the active energy ray curable resin include acrylate resins, examples of the thermosetting resin include epoxy resins, and examples of the heat drying resin include cyanoethyl cellulose resins and fluorine resins.

  The thickness of the luminous body layer 12 is preferably 10 to 150 μm, and more preferably 20 to 70 μm.

  The phosphor layer 12 can be formed by a known method. Among these, a method having a step of applying a coating liquid by applying a screen printing method, a slide coating method, a spin coating method, a dip coating method, a bar coating method, a spray coating method, or the like is preferable. For example, in the case of screen printing, the phosphor layer 12 is formed by dispersing fine particles of an inorganic phosphor in a binder resin solution to form a dispersion and applying the dispersion through a screen mesh. At this time, it is possible to control the thickness of these layers by appropriately selecting the thickness of the screen mesh, the aperture ratio, and the number of coatings, and it is possible to easily enlarge the formation surface by changing the size of the screen mesh. . In particular, when the substrate 11a on which the electrode layer 11b is formed is a flexible film substrate, a continuous process by Roll-to-Roll can be easily applied.

Any dielectric layer 10 can be used. In particular, when a high dielectric constant is realized, a layer containing an inorganic dielectric is preferable. As the inorganic dielectric in the dielectric layer 10, any material can be used as long as it is a material having a high dielectric constant and insulation and a high breakdown voltage. Specifically, various metal oxides and nitrides can be exemplified, and preferable ones are SiO ₂ , TiO ₂ , BaTiO ₃ , SrTiO ₃ , PbTiO ₃ , KNbO ₃ , PbNbO ₃ , Ta ₂ O ₃ , BaTa ₂ O. ₆ , LiTaO ₃ , Y ₂ O ₃ , Al ₂ O ₃ , ZrO ₂ , AlON and the like can be exemplified, and BaTiO ₃ and SrTiO ₃ are particularly preferable. These can be used alone or in combination.

  The dielectric layer 10 is preferably a layer formed by dispersing and containing inorganic dielectric particles. As binder resin used for dispersion of inorganic dielectric particles, active energy ray curable resin, thermosetting resin, heat drying resin (resin that does not cause cross-linking reaction and forms a film by drying solvent) ) Can be used. An acrylate resin is used as the active energy ray curable resin, an epoxy resin is used as the thermosetting resin, and a dielectric constant is relatively high among cyanoethyl cellulose resins and vinylidene fluoride resins as the heat drying resin. Each polymer can be exemplified. These binder resins can also be used as a single resin that does not contain inorganic dielectric particles.

  The dielectric constant of the dielectric layer 10 is preferably 5 to 200, more preferably 15 to 100, and particularly preferably 50 to 80.

  The thickness of the dielectric layer 10 is preferably as thin as possible without causing dielectric breakdown, and is preferably 1 to 50 μm, and more preferably 1 to 30 μm.

  In the present embodiment, the dielectric layer 10 may be either transparent or opaque, and may be adjusted according to the type of dielectric used and other components.

In the present embodiment, it is preferable that the dielectric constants of the patterned dielectric layer 10 and the light emitting layer 12 are different. Since the dielectric constants are different, the contrast ratio (luminance at a portion where the dielectric layer 10 is not provided / brightness at a portion where the dielectric layer 10 is provided) is increased, and an image can be displayed more clearly.
When the dielectric layer 10 and the light emitting layer 12 have different dielectric constants, the dielectric layer 10 preferably has a higher dielectric constant than the light emitting layer 12. The dielectric constant of the dielectric layer 10 may be adjusted by adjusting the type and / or amount of the dielectric material to be contained.

  The dielectric in the dielectric layer 10 may be one kind alone, or two or more kinds.

The dielectric layer 10 is provided at a predetermined location on the light emitting layer 12 and patterned so as to form a desired image. In the present invention, “image” refers to all still images including not only video but also characters and the like.
The method for patterning the dielectric layer 10 is not particularly limited, and a known method can be arbitrarily applied according to a desired image. For example, a coating liquid containing a dielectric is applied by the same method as that for the light emitting layer 12. Next, when the dielectric is active energy ray curable, active energy ray irradiation is performed, and when the dielectric is thermosetting or heat drying, curing or drying is performed by heating.
As a method for patterning the dielectric layer 10, for example, when a precise image is desired to be displayed, a printing method such as screen printing, gravure printing, gravure offset printing, or offset printing can be applied. Moreover, it can also pattern by the photolithographic method using a photosensitive emulsion or photosensitive resin.

The back electrode 15 can be made of any material having transparent or opaque conductivity, and is preferably opaque when the dispersed inorganic EL panel 1 is used alone.
The materials having opaque conductivity include gold, silver, copper, aluminum, beryllium, cobalt, chromium, iron, germanium, iridium, potassium, lithium, magnesium, molybdenum, sodium, nickel, platinum, silicon, tin, tantalum, Examples thereof include metals such as tungsten and zinc, and conductive carbon materials such as graphite. Of these, gold, silver, copper, aluminum, graphite and the like are preferable.
Examples of the transparent conductive material include the same materials as the transparent electrode layer.
The back electrode 15 can be formed by pasting a conductive sheet on the surface on which the dielectric layer 10 is patterned, or printing / coating a conductive paste. In particular, when a conductive paste is used, it is preferable in that a continuous process by Roll-to-Roll can be easily applied.

[Second Embodiment]
FIG. 2 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to the second embodiment of the invention. In the present embodiment, the provided dielectric layers are two layers, except that the first dielectric layer 13 is provided in addition to the patterned second dielectric layer 14. It is the same as one embodiment. Among the components in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted. The same applies to other embodiments described later.

  The dispersion-type inorganic EL panel 2 is configured by laminating a front electrode 11, a light emitter layer 12, a first dielectric layer 13, a second dielectric layer 14, and a back electrode 15 in this order. The second dielectric layer 14 is patterned so as to form a desired image, and the first dielectric layer 13 and the back electrode 15 are in contact with each other except for the patterning portion.

  The first dielectric layer 13 preferably has a higher dielectric constant than the second dielectric layer 14. Any material can be used for the first dielectric layer 13. In particular, when a high dielectric constant is realized, a layer containing an inorganic dielectric is preferable. As the inorganic dielectric in the first dielectric layer 13, any material can be used as long as it has a high dielectric constant and insulating property and a high dielectric breakdown voltage. Specifically, the same inorganic dielectric in the dielectric layer 10 can be exemplified.

  The first dielectric layer 13 is preferably a layer formed by dispersing and containing inorganic dielectric particles. The binder resin used for dispersion of the inorganic dielectric particles is the same as the binder resin in the dielectric layer 10.

  The first dielectric layer 13 can be formed in the same manner as the light emitting layer 12.

  The dielectric constant of the first dielectric layer 13 is preferably 5 to 200, more preferably 15 to 100, and particularly preferably 50 to 80.

The thickness of the first dielectric layer 13 is preferably as thin as possible without causing dielectric breakdown, and is preferably 1 to 50 μm, and more preferably 1 to 30 μm.
The first dielectric layer 13 may be either transparent or opaque, and may be adjusted depending on the type of dielectric used and other components.

The second dielectric layer 14 preferably has a dielectric constant lower than that of the first dielectric layer 13, and the dielectric constant may be adjusted by adjusting the type and / or amount of the dielectric to be contained. In this case, the dielectric in the second dielectric layer 14 may be any material having a low dielectric constant and a high dielectric breakdown voltage. For example, the active energy ray curable resin, the thermosetting resin, and the heat drying resin (A resin that does not cause a reaction such as crosslinking and forms a film by drying of a solvent) can be used. As the active energy ray-curable resin, for example, when a screen printing method is applied as a patterning method for the second dielectric layer, a photosensitive emulsion for screen plate making can be used. For example, an epoxy resin can be used as the thermosetting resin. As the heat drying resin, for example, a fluorine-based resin can be used.
In the present embodiment, the second dielectric layer 14 may be either transparent or opaque, and may be adjusted according to the type of dielectric used and other components.

  The dielectric in the second dielectric layer 14 may be a single type or two or more types.

  The dielectric constant of the second dielectric layer 14 is preferably 1 to 8, and more preferably 1 to 5.

  The luminance of the portion where the second dielectric layer 14 is provided when an AC voltage is applied decreases as the thickness of the second dielectric layer 14 increases, and the second dielectric layer 14 is provided. There is a tendency that the contrast ratio with the brightness of the part where no second dielectric layer is provided (the brightness of the part where the second dielectric layer is not provided / the brightness of the part where the second dielectric layer is provided). The larger the contrast ratio, the clearer the image can be displayed. However, if the thickness of the second dielectric layer 14 is too thick, the dispersion-type inorganic EL panel 2 cannot be thinned and the cost increases. From these viewpoints, the thickness of the second dielectric layer 14 is preferably 2 to 100 μm, more preferably 5 to 60 μm, and particularly preferably 7 to 45 μm.

The second dielectric layer 14 is provided and patterned at a predetermined location on the first dielectric layer 13 so as to form a desired image.
The method for patterning the second dielectric layer 14 is not particularly limited, and a known method can be arbitrarily applied according to a desired image. For example, a coating liquid containing a dielectric is applied by the same method as that for the first dielectric layer 13. Next, when the dielectric is active energy ray curable, active energy ray irradiation is performed, and when the dielectric is thermosetting or heat drying, curing or drying is performed by heating.
As a method for patterning the second dielectric layer 14, for example, when a precise image is desired to be displayed, a printing method such as screen printing, gravure printing, gravure offset printing, or offset printing can be applied. Moreover, it can also pattern by the photolithographic method using a photosensitive emulsion or photosensitive resin.

  In the dispersion-type inorganic EL panel 2, when the potential difference of the AC voltage to be applied is the same, the lower the frequency, the lower the luminance in the portion where the second dielectric layer 14 is provided and the portion where it is not provided. Tend to be. In addition, when the frequency of the alternating voltage to be applied is the same, the lower the potential difference, the lower the luminance at any part where the second dielectric layer 14 is provided and where it is not provided.

[Third embodiment]
FIG. 3 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to the third embodiment of the invention.
In the dispersion-type inorganic EL panel 3, the second dielectric layer 14 is not between the first dielectric layer 13 and the back electrode 15 but between the first dielectric layer 13 and the phosphor layer 12. Except for being patterned, it is the same as the dispersion-type inorganic EL panel 2 according to the second embodiment. The first dielectric layer 13 is provided between the second dielectric layer 14 and the back electrode 15.

  In the dispersion-type inorganic EL panel 3, the potential difference, frequency, and luminance of the AC voltage to be applied have the same relationship as that of the dispersion-type inorganic EL panel 2.

  The dispersion type inorganic EL panel 3 is the same as the dispersion type inorganic EL panel 2 except that the second dielectric layer 14 is patterned on the light emitting layer 12 and the first dielectric layer 13 is formed on the patterning surface. It can produce like.

[Fourth embodiment]
FIG. 4 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to the fourth embodiment of the invention.
In the dispersion-type inorganic EL panel 4, the second dielectric layer 14 is patterned not between the first dielectric layer 13 and the back electrode 15 but between the electrode layer 11 b and the light emitting layer 12. Except for the point, it is the same as the dispersion-type inorganic EL panel 2 according to the second embodiment. And it can produce similarly to the dispersion | distribution type inorganic EL panel 2 except patterning the 2nd dielectric material layer 14 on the electrode layer 11b, and forming the light-emitting body layer 12 on this patterning surface.
Thus, even if the second dielectric layer 14 is not provided in contact with the first dielectric layer 13, an image can be displayed in the same manner as in the first and second embodiments. However, when at least a part of the light emitter layer is located on the back electrode side of the second dielectric layer, the second dielectric layer needs to be transparent.

[Fifth embodiment]
FIG. 5 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to the fifth embodiment of the invention.
In the dispersion-type inorganic EL panel 5, the second dielectric layer 14 is not overlaid on the first dielectric layer 13 in the thickness direction of the panel, but in the electrode surface direction of the panel. Except for being arranged in the same plane as the body layer 13, it is the same as the dispersion-type inorganic EL panel 2 according to the second embodiment. That is, in the dispersion type inorganic EL panel 5, the first dielectric layer 13 and the second dielectric layer 14 are both patterned on the light emitting layer 12 in the same plane. The dispersion-type inorganic EL panel 5 can be produced in the same manner as the dispersion-type inorganic EL panel 2 except that both the first dielectric layer 13 and the second dielectric layer 14 are patterned on the light-emitting layer 12. Note that the layer in which the first dielectric layer 13 and the second dielectric layer 14 are patterned in the same plane may be disposed between the front electrode 11 and the light emitting layer 12 as long as it is transparent.

  In the present invention, the second dielectric layer may be an air layer. In the case where the second dielectric layer is an air layer, the dispersion-type inorganic EL panel includes a second dielectric layer 14 and a first dielectric layer 13 which are air layers in FIG. Further, it is preferable that a further first dielectric layer 13 is provided between them. By adopting such a configuration, current leakage due to the air layer is suppressed, and a dispersive inorganic EL panel with better quality is obtained. In such a dispersion-type inorganic EL panel, a dispersion-type inorganic EL panel is formed except that the first dielectric layer 13 is formed on the entire surface of the light emitting layer 12 and the first dielectric layer 13 is further patterned thereon. It can be manufactured in the same manner as the EL panel 5. Further, the two first dielectric layers 13 may be integrally formed. For example, the first dielectric layer 13 may be patterned on the light emitting layer 12 so as to provide a recess in the first dielectric layer 13. Also good.

  In the second to fifth embodiments, examples in which only the second dielectric layer or the first and second dielectric layers are patterned are described. In the present invention, the first dielectric layer is used. Only may be patterned. However, it is preferable that only the second dielectric layer or both the first and second dielectric layers are patterned from the viewpoint that an image with a higher contrast ratio can be displayed.

  In the present invention, by using two dielectric layers as in the second to fifth embodiments, the contrast ratio is higher than in the case where the dielectric layer is a single layer as in the first embodiment. A higher image can be displayed.

The present invention is known in the art that luminance is changed at a portion where a patterned dielectric layer is provided when an alternating voltage is applied by arranging the dielectric layer and the patterned dielectric layer in combination. It was the first time that a phenomenon that was not found was discovered and completed. In particular, the effect is enhanced by arranging the dielectric layers having different dielectric constants and / or different film thicknesses in combination. The dielectric layer may be configured to also serve as the light emitter layer (for example, the first embodiment), or may be separately provided in addition to the light emitter layer (for example, the second to fifth embodiments).
A conventional dispersion-type inorganic EL panel is used as a light-emitting light source, and a light-transmitting panel on which an image is formed in advance is used for image display. On the other hand, the dispersion-type inorganic EL panel of the present invention is different from the conventional panel in that it forms an image itself.
According to the dispersion-type inorganic EL panel of the present invention, an image is not displayed at the time of extinction, and an image is displayed only at the time of light emission. Therefore, since the unexpectedness at the time of image display is strong and a strong impact can be given, for example, an advertisement having a high appeal effect in POP or the like is possible.

<Dispersed inorganic EL composite panel>
The dispersion-type inorganic EL composite panel of the present invention is based on the configuration in which the light-emitting layer and one or more dielectric layers are provided between the back electrode and the front electrode of the dispersion-type inorganic electroluminescence panel of the present invention. A plurality of such units are stacked, all dielectric layers and all electrodes except the backmost side are transparent, and each unit can independently emit and / or extinguish. To do.
What is necessary is just to select suitably the number of the dispersion | distribution type inorganic electroluminescent panels piled up according to the objective. For example, when a plurality of images are sequentially switched or simultaneously displayed, an arbitrary number corresponding to the number of images may be used. When a display image is colored, the number is set according to the color scheme. good.

[Sixth embodiment]
FIG. 6 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL composite panel according to the sixth embodiment of the invention.
The dispersion-type inorganic EL composite panel 6 shown here is obtained by stacking the dispersion-type inorganic EL panels 2A, 2B, and 2C according to the second embodiment in this order in the same direction. Here, “same direction” means that the back electrode 15 is positioned above the front electrode 11 in the paper in any of the dispersion-type inorganic EL panels.
In the dispersion-type inorganic EL composite panel 6, the first dielectric layer 13 and the second dielectric layer 14 are transparent in all of the dispersion-type inorganic EL panels 2A, 2B, and 2C. Moreover, the back electrode 15 and the front electrode 11 of the dispersion type inorganic EL panels 2A to 2C are all transparent except for the back electrode 15 of the dispersion type inorganic EL panel 2C which is the rearmost side.

  In FIG. 6, the dispersion type inorganic EL panel is overlaid with the front electrode 11 and the back electrode 15 in contact with each other, but the present invention is not limited to this, and the effects of the present invention are achieved. The front electrode 11 and the back electrode 15 may be overlapped without contacting each other within a range not damaged.

  As the dispersive inorganic EL panels to be stacked, for example, as shown in FIG. 6, all the panels according to the second embodiment may be used. Panels having different configurations such as those according to the embodiment and those according to the third embodiment may be used in combination.

  There is no particular limitation on the method of allowing the stacked dispersion-type inorganic EL panels to emit light and / or extinguish independently of each other. For example, as shown in FIG. 6, a method of connecting an AC power supply 16 between a transparent electrode and a back electrode in each of the dispersion-type inorganic EL panels, such as stacking the dispersion-type inorganic EL panels of the present invention as they are. Can be illustrated.

[Seventh embodiment]
FIG. 7 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL composite panel according to the seventh embodiment of the present invention.
The dispersion-type inorganic EL composite panel 7 shown here is formed by stacking three dispersion-type inorganic EL panels according to the fourth embodiment. In the first dispersion-type inorganic EL panel according to the fourth embodiment from the lower side of the drawing, the back electrode 15 is omitted. In the second dispersion-type inorganic EL panel according to the fourth embodiment, the base material 11a is omitted, and the electrode layer 11b serves as the back electrode of the first panel and the front electrode of the second panel. ing. The third dispersion-type inorganic EL panel according to the fourth embodiment is arranged in the reverse direction. The back electrode 15 of the second panel also serves as the back electrode of the third panel. In the dispersion type inorganic EL panel according to the fourth embodiment, as individual panels, reference numeral 11 in the figure is referred to as a front electrode, and reference numeral 15 is referred to as a back electrode. Do not mean. In the composite panel, there is no concept of a front electrode and a back electrode in the electrodes arranged in the middle. That is, in the composite panel as a whole, the electrode located on the foremost side may be referred to as the front electrode, the electrode on the most opposite side opposite thereto is referred to as the back electrode, and the electrode arranged in the middle may be referred to as the intermediate electrode.
In the dispersion-type inorganic EL composite panel 7 shown in FIG. 7, the electrode layer 11b and the electrode 15 disposed in the middle are transparent. Further, either one of the two electrodes 11 may be opaque.

  According to the dispersion-type inorganic EL composite panel of the present invention, a plurality of stacked dispersion-type inorganic EL panels are independently lit and / or extinguished, so that a plurality of images are sequentially switched or displayed simultaneously. Can be made. In addition, the display image can be colored by changing the color of the image for each dispersed inorganic EL panel and displaying it simultaneously. At this time, by displaying the images with different colors in an overlapping manner, the images can be displayed in various colors by overlapping the colors.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.

[Examples 1 to 3, Comparative Example 1]
As shown in FIG. 2, an inorganic EL panel in which a second dielectric layer was provided between the first dielectric layer and the back electrode was produced by the following procedure.
An ITO-deposited glass plate was used as the front electrode.
On the front electrode, a mixture of phosphor GG45 (manufactured by Sylvania, inorganic phosphor) / cyanoresin CR-M (manufactured by Shin-Etsu Chemical Co., Ltd.) / Cyclohexanone = 5 g / 1 g / 4 g was applied by screen printing, and 40 The phosphor layer was formed so as to have a thickness of 45 to 50 μm by drying under conditions of ° C / 15 minutes and 120 ° C / 30 minutes.
Next, a mixture of barium titanate (BaTiO ₃ ) HPBT-1 (manufactured by Fuji Titanium Industry Co., Ltd.) / Cyanoresin CR-M (manufactured by Shin-Etsu Chemical Co., Ltd.) / Cyclohexanone = 5 g / 1 g / 4 g on the phosphor layer. Was applied by screen printing and dried under the conditions of 40 ° C./15 minutes and further 120 ° C./30 minutes to form a first dielectric layer having a thickness of 10 to 20 μm. The dielectric constant of the first dielectric layer was 67.
Next, dirazol rapid (Teikoku Ink Manufacturing Co., Ltd., emulsion for screen plate making) was applied to one half of the surface of the first dielectric layer by a screen printing method, and this was accumulated with a metal halide lamp. The thickness is 8 μm (Example 1), 22 μm (Example 2), or 39 μm (Example 3) by exposing and curing at an illuminance of 2.0 mW / cm for 120 seconds so as to be 247.5 mJ / cm ^2. A second dielectric layer was formed so that The dielectric constant of the second dielectric layer was about 5.
Next, Electrodag 427SS (manufactured by Japan Atchison Co., Ltd., silver ink) is applied on the first dielectric layer on which the second dielectric layer is formed, and dried under conditions of 120 ° C./30 minutes, A back electrode was formed to form an inorganic EL panel.
An AC voltage is applied to the manufactured inorganic EL panel under predetermined conditions (voltage, frequency) to emit light, and the second dielectric layer is provided (Examples 1 to 3). The brightness of the part (Comparative Example 1) is measured with a color luminance meter BM-7 (manufactured by Topcon Co., Ltd.), and the contrast ratio (the brightness of the part where the second dielectric layer is not provided / second dielectric) The luminance of the part provided with the body layer was determined. Table 1 shows the results under each light emitting condition. The voltages in Table 1 are effective values.

[Examples 4 to 6, Comparative Example 2]
Instead of DiRasol Rapid (made by Teikoku Ink Manufacturing Co., Ltd., photosensitive emulsion for screen plate making), the epoxy resin FEVE resin F400 (large ▲ ream 振 邦 邦 ▲ 塗 ▼ ▼ 股 股 製 有限公司 有限公司 、, Fluoroethylene Vinyl ether) / TDI trimer HT3375 (manufactured by Bayer, toluene diisocyanate) / methyl ethyl ketone = 1 g / 0.1 g / 0.5 g, and this is cured at 120 ° C./30 min. Inorganic EL in the same manner as in Examples 1 to 3, except that the second dielectric layer was formed so as to be 9 μm (Example 4), 24 μm (Example 5), or 41 μm (Example 6). A panel was produced. The dielectric constant of the second dielectric layer was about 3.
An AC voltage is applied to the manufactured inorganic EL panel under predetermined conditions (voltage, frequency) to emit light, and the second dielectric layer is provided (Examples 4 to 6). The brightness | luminance of the site | part (comparative example 2) which does not exist was measured with color luminance meter BM-7 (made by Topcon Corporation), and the contrast ratio was calculated | required similarly to the above. Table 2 shows the results under each light emitting condition. The voltages in Table 2 are effective values.

[Examples 7 to 9, Comparative Example 3]
As shown in FIG. 2, an inorganic EL panel in which a second dielectric layer was provided between the first dielectric layer and the back electrode was produced by the following procedure.
An ITO-deposited glass plate was used as the front electrode.
On the front electrode, a mixture of phosphor GG45 (manufactured by Sylvania, inorganic phosphor) / cyanoresin CR-M (manufactured by Shin-Etsu Chemical Co., Ltd.) / Cyclohexanone = 5 g / 1 g / 4 g was applied by screen printing, and 40 The phosphor layer was formed so as to have a thickness of 45 to 50 μm by drying under conditions of ° C / 15 minutes and 120 ° C / 30 minutes.
Next, a mixture of cyanoresin CR-M (manufactured by Shin-Etsu Chemical Co., Ltd.) / Cyclohexanone = 1 g / 4 g was applied on the phosphor layer by screen printing, and 40 ° C./15 minutes, further 120 ° C./30 minutes. It dried on conditions, and formed the 1st dielectric material layer so that thickness might be set to 10-20 micrometers. The dielectric constant of the first dielectric layer was 17.
Next, dirazol rapid (Teikoku Ink Manufacturing Co., Ltd., emulsion for screen plate making) was applied to one half of the surface of the first dielectric layer by a screen printing method, and this was accumulated with a metal halide lamp. The thickness is 10 μm (Example 7), 23 μm (Example 8), or 38 μm (Example 9) by exposing and curing at an illuminance of 2.0 mW / cm for 120 seconds so as to be 247.5 mJ / cm ^2. A second dielectric layer was formed so that The dielectric constant of the second dielectric layer was about 5.
Next, Electrodag 427SS (manufactured by Japan Atchison Co., Ltd., silver ink) is applied on the first dielectric layer on which the second dielectric layer is formed, and dried under conditions of 120 ° C./30 minutes, A back electrode was formed to form an inorganic EL panel.
An alternating voltage is applied to the manufactured inorganic EL panel under predetermined conditions (voltage, frequency) to emit light, and the second dielectric layer is provided as a part (Examples 7 to 9). The brightness of the part (Comparative Example 3) is measured with a color luminance meter BM-7 (manufactured by Topcon Co., Ltd.), and the contrast ratio (the brightness of the part where the second dielectric layer is not provided / second dielectric) The luminance of the part provided with the body layer was determined. Table 3 shows the results under each light emitting condition. The voltages in Table 3 are effective values.

[Examples 10 to 12, Comparative Example 4]
Instead of DiRasol Rapid (made by Teikoku Ink Manufacturing Co., Ltd., photosensitive emulsion for screen plate making), the epoxy resin FEVE resin F400 (large ▲ ream 振 邦 邦 ▲ 塗 ▼ ▼ 股 股 製 有限公司 有限公司 、, Fluoroethylene Vinyl ether) / TDI trimer HT3375 (manufactured by Bayer, toluene diisocyanate) / methyl ethyl ketone = 1 g / 0.1 g / 0.5 g, and this is cured at 120 ° C./30 min. Inorganic EL in the same manner as in Examples 7 to 9 except that the second dielectric layer was formed so as to be 11 μm (Example 10), 22 μm (Example 11), or 40 μm (Example 12). A panel was produced. The dielectric constant of the second dielectric layer was about 3.
An AC voltage is applied to the manufactured inorganic EL panel under predetermined conditions (voltage, frequency) to emit light, and the second dielectric layer is provided (Examples 10 to 12). The brightness | luminance of the site | part (Comparative Example 4) which does not exist was measured with the color luminance meter BM-7 (made by Topcon Corporation), and the contrast ratio was calculated | required similarly to the above. Table 4 shows the results under each light emitting condition. The voltages in Table 4 are effective values.

  The present invention is applicable to a monochrome or color still image display device.

1 is a cross-sectional view schematically illustrating a dispersion-type inorganic EL panel according to a first embodiment of the invention. It is sectional drawing which illustrates typically the dispersion type inorganic electroluminescent panel concerning 2nd embodiment of this invention. It is sectional drawing which illustrates typically the dispersion type inorganic electroluminescent composite panel concerning 3rd embodiment of this invention. It is sectional drawing which illustrates typically the dispersion type inorganic electroluminescent panel concerning 4th embodiment of this invention. It is sectional drawing which illustrates typically the dispersion type inorganic electroluminescent panel concerning 5th embodiment of this invention. It is sectional drawing which illustrates typically the dispersion type inorganic EL composite panel concerning the 6th embodiment of this invention. It is sectional drawing which illustrates typically the dispersion | distribution type inorganic EL composite panel concerning the 7th embodiment of this invention.

Explanation of symbols

  1, 2, 2A, 2B, 2C, 3, 4, 5 ... dispersive inorganic electroluminescence (EL) panel, 6, 7 ... dispersive inorganic electroluminescence (EL) composite panel, 10 ... dielectric Body layer, 11 ... front electrode, 11a ... base material, 11b ... electrode layer, 12 ... illuminant layer, 13 ... first dielectric layer, 14 ... second Dielectric layer, 15 ... back electrode

Claims (8)

  A dispersed inorganic electroluminescence panel, wherein a light emitting layer and one or more dielectric layers are provided between a back electrode and a front electrode, and at least one of the dielectric layers is patterned.   The dispersive inorganic electroluminescence panel according to claim 1, wherein the dielectric layer that is patterned has a dielectric constant higher than that of the light emitting layer.   As the dielectric layer, a first dielectric layer and a second dielectric layer are provided, and the second dielectric layer has a dielectric constant lower than that of the first dielectric layer, and at least of these dielectric layers. The dispersion-type inorganic electroluminescence panel according to claim 1 or 2, wherein one is patterned.   4. The dispersed inorganic electro according to claim 3, wherein the second dielectric layer is patterned between the first dielectric layer and the back electrode, or between the first dielectric layer and the light emitting layer. Luminescence panel.   4. The first dielectric layer is provided between the patterned second dielectric layer and the back electrode, or between the patterned second dielectric layer and the light emitting layer. The dispersion-type inorganic electroluminescence panel described.   The dispersive inorganic electroluminescence panel according to claim 3, wherein a second dielectric layer is patterned between the light emitting layer and the front electrode.   The dispersed inorganic electroluminescence panel according to claim 3, wherein both the first dielectric layer and the second dielectric layer are patterned in the same plane. The dispersion-type inorganic electroluminescence panel according to any one of claims 1 to 7, wherein a unit in which a light emitting layer and one or more dielectric layers are provided between a back electrode and a front electrode is the unit. Multiple units are stacked,
A dispersed inorganic electroluminescence composite panel, wherein all dielectric layers and all electrodes except the backmost side are transparent, and each unit can independently emit and / or quench.

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