JPS62128488A - Display apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application" The present invention is a display device in which an excited luminescent material such as a rare earth element or a transition metal element is encapsulated in an aluminum anodic oxide film to cause electric field excitation luminescence. The present invention relates to a display device, and more particularly to a display device characterized by its electric field excitation structure.

"Prior art" A light emitting device in which a phosphor such as a rare earth element such as europium or terbium is activated and encapsulated in a porous film obtained by anodizing a high-purity aluminum plate or foil. The applicant of this application previously disclosed the body element in Japanese Unexamined Patent Application Publication No. 1986-
This was proposed in Japanese Patent Application Laid-open No. 182689 and Japanese Patent Application Laid-open No. 60-205989. As a means of activating and encapsulating a phosphor in a porous film formed by anodizing, the porous film is immersed in a phosphor salt solution such as a europium salt solution or a terbium salt solution, and then re-anodized. method can be adopted. In such a method, in order to prevent the phosphor sealed in the porous film from leaking out, the pores filled with the phosphor are sealed, and the fluorescent material inside the pores of the porous film is sealed. In order to increase the amount of encapsulation and stability, it is also possible to form even finer encapsulation holes at the bottom of each hole by performing a second anodization treatment at a lower voltage after the second anodization treatment step. .

In addition to ultraviolet rays or electron beams, electric field excitation means or the like can be used as a means for excitation of luminescence of such a light-emitting element.
In the case of the electric field excitation means, as shown in FIG. By arranging the so-called Nesa Glass 4 on which the transparent electrode 5A is formed, and applying an AC voltage E between the two aluminum plates and the transparent electrode 5, the phosphor can be activated depending on the type and class of the encapsulated phosphor. It is possible to perform an operation of emitting light in orange, red, yellow-green, or the like.

"Problems to be Solved by the Invention" When constructing a display device using such a light-emitting element, if the transparent electrode 5A is simply formed in close contact with the porous light-emitting film 3 as described above, the transparent electrode 5A becomes transparent 1! Since abnormal discharge occurs between the pole 5A and the light emitting film 3, causing dielectric breakdown of the film 3, the light emitting element 1 is destroyed in a short time, making it extremely difficult to expect stable light emitting operation. However, the problem is that the luminance is low. Further, such a display device has the disadvantage that characters, symbols, figures, etc. to be displayed are greatly restricted due to the structure of the uniform transparent electrode 5A.

"Means for Solving the Problems" Therefore, the present invention provides a display device in which a transparent electrode is provided on a luminescent element in which an excited luminescent material is enclosed in an aluminum anodic oxide film. The electrode and the transparent electrode are arranged in a mutual matrix electrode structure, and insulating spacers forming a large number of display gaps corresponding to the matrix electrode structure are provided between the light emitting element and the transparent electrode. M) To provide a display device which can display arbitrary light emission such as characters, symbols or figures by selectively applying an excitation voltage to the IJ Lux poles. A structure may also be adopted in which an insulating resin such as phenol resin is filled between the strip electrodes to be provided on the light emitting element side in order to increase the mechanical strength of the light emitting element.

"Examples" The present invention will be described in more detail below according to illustrated embodiments.
In FIGS. 1 to 3, the same reference numerals as in FIG. 5 indicate the same components, and in FIG. and also,
As shown in the figure, a large number of transparent electrodes 5 on the Nesa glass 4 side are formed in a strip shape in a manner perpendicular to the strip electrode 2, and these electrodes 2 and 5 constitute a mutual matrix electrode structure. Reference numeral 7 denotes an insulating spacer interposed between the porous light emitting film 3 and the transparent electrode 5, in which a large number of display gaps 6 formed corresponding to the matrix electrode structure are arranged. The gap between the porous light emitting film 3 and the transparent electrode 5 formed in each display gap 6, and thus the thickness of the spacer 7, can be from several μm to several tens of μm, for example from 2 to 19 pm, preferably from 5 to 10 μm. It can be set to about 18 μm. Such a spacer 7 is not limited to the method of constructing it separately as in this example, but can be formed by, for example, an insulating metal oxide film such as aluminum oxide or titanium oxide by sputtering, or an insulating polymer film by screen printing or photolithography. etc. can also be formed directly on the porous light emitting film 3.

The luminescent material to be enclosed in the porous luminescent film 3 is not limited to the above-mentioned rare earth elements, but may be Mn.

One or two types of transition element metals such as Co, Zn, or Ce, or metals thereof can be used as appropriate, and the encapsulation means include the electrochemical method as described above, as well as direct injection into the porous film. It is also suitable to inject the above-mentioned light-emitting material by ion implantation. Such a porous luminescent coating 3 can be peeled off from an aluminum plate as a base material by a reverse electrolytic method.

FIG. 2 shows an example of a method of forming the band-shaped electrode 2 provided on the light emitting element 1. In this method, a resist material 8 for etching is applied to the two aluminum plates of the light emitting element 1 having a conventional structure. Etching means using an aqueous solution of mercuric chloride, a methanol solution of bromine, or an anhydrous ether solution of hydrogen chloride, which can dissolve only two aluminum plates without dissolving the porous luminescent coating 3 in a state in which a large number of strips are provided. You can do it with Furthermore, when using a material from which the porous light-emitting film 3 has been peeled off as described above, the band-shaped electrode 2 can be appropriately formed thereon alone.

In such a display device, 280V to 380V is selectively applied between the strip-shaped electrodes 2 and 5 constituting the matrix electrode.
By applying an alternating current voltage of approximately It becomes possible to maintain a stable and uniform high-brightness light-emitting display operation while suitably preventing the occurrence of discharge.

As shown in FIG. 3, between the strip electrodes 2 on the side of the light emitting element 1, an insulating resin 9 such as a phenolic resin having a coefficient of thermal expansion equal to or close to that of the electrode material made of aluminum or the like is filled. It is also preferable to configure the light emitting element 1 so as to increase its mechanical strength. And porous luminescent coating 3
This type of electroluminescent display device uses, in addition to the matrix electrode structure and the matrix display using the spacer 7,
Characters 6A and 6B as illustrated in FIG. 4 are formed between the porous luminescent coating 3 of the luminous element 1 shown in FIG. 5 and the transparent electrode 5A.
It is also preferable to use a spacer 7 made of an insulating film punched out to display specific characters, etc.; Since it is necessary to punch out the shape of the spacer in advance, the display content tends to be restricted compared to the present invention, which can perform any matrix light emitting display using a single spacer. Therefore, the present invention is extremely advantageous in that it provides any matrix light emitting display function without changing the spacer.

"Effects of the Invention" As explained above, the display device of the present invention is an electric field excitation light emitting display device using a porous light emitting film in which a luminescent material is enclosed in an aluminum anodic oxide film. Since the electrodes for electric field excitation are formed in a matrix structure and the spacer is provided with a large number of gaps for light emitting display corresponding to the matrix electrodes, any matrix light emitting display can be performed using a single spacer. This allows the display function to be suitably enhanced. Further, in such a light emitting display operation, it is possible to suitably prevent the occurrence of abnormal discharge as in the conventional case, maintain a stable and uniform high luminance light emitting display operation, and provide a highly durable display device.

[Brief explanation of drawings]

FIG. 1 is a conceptual exploded perspective view of a display device according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a method of forming a strip electrode on the light emitting element of FIG. 1, and FIG. , a conceptual partial cross-sectional configuration diagram of a display device in which an insulating resin is filled between the strip electrodes of the light-emitting element in the display device shown in FIG. 1, and FIG. FIG. 5 is a conceptual partial cross-sectional configuration diagram of a conventional display device using a porous light emitting film. 1: Two luminous elements: Aluminum plate 2: Strip-shaped electrode 3: Porous luminescent film 4: Nesa glass 5: Transparent strip-shaped electrode 6: Display gap 7: Insulating spacer 9: Insulating resin Figure 1, Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a display device in which a transparent electrode is provided on a light-emitting element in which an excited light-emitting substance is enclosed in an aluminum anodic oxide film, the electrode of the light-emitting element and the transparent electrode are arranged in a mutual matrix electrode structure. 1. A display device comprising: an insulating spacer that forms a large number of display gaps corresponding to the matrix electrode structure, and is provided between the light emitting element and the transparent electrode. (2) The display device according to claim (1), wherein an insulating resin is provided between the strip electrodes of the light emitting element.