JPS60130096A - El panel - 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 applications The present invention relates to an EL panel.

Conventional configuration and its problems In the recent information society, the role of nice play, which is a means of visually transmitting information, has become even more important. In particular, with the rapid spread of microcomputers, they have become suitable for displaying not only numbers but also letters, symbols, and figures.
There is a strong demand for particularly thin and lightweight displays. One of them is an EL display device that uses all EL panels.

EL panels are generally classified into powder dispersion type and thin film type, and further divided into alternating current type and direct current type based on their driving method. All of these four persimmon types use ZnS as the phosphor layer matrix.

One thing that can be said in common is that this compound is sensitive to moisture, which is one of the causes of brightness deterioration during one drive. Therefore, the above E
The L panel must be moisture-proofed in some way.

Conventionally, the methods of (1) covering the entire EL layer in a dense layer with an inorganic or other substance film, (2) providing an envelope such as a crow cap, and (3) using the crow canog described in (2) above. (4) Fill the crow cap in (2) above with an insulating liquid such as silicone oil; (5) Absorb moisture together with the insulating liquid such as silicone oil in the crow cap in (2) above. As an agent, it can be used as
Countermeasures have been taken, such as pasting the sorted material on the inner wall of the cap.

In order to improve the contrast as well as prevent moisture, a method has been devised in which the entire silicone oil is colored with the above-mentioned dye.

The above moisture-proofing measures have the following problems in terms of effectiveness and production. That is, method (1) is inconvenient for heat dissipation of the EL element and self-healing micro-dielectric breakdown, and method (2) is insufficiently effective. Methods (3), (4), and (5) all have manufacturing difficulties, and method (3) is difficult to manufacture because of the pressure difference between the external atmospheric pressure and the vacuum inside the cap. There is a risk of strength damage. Therefore, it is desirable to have an EL panel that is easier to manufacture, has lower contrast, and has an effective moisture-proof sealing device.

Purpose of the Invention As described above with respect to the structure of the conventional example and its problems, the present invention provides a long-life EL that is effective in preventing moisture, is easy to manufacture, and is provided with a sealing member that also has the effect of improving contrast.
The purpose is to realize a panel.

Structure of the Invention The present invention is to form a zeolite colored blue by adding CO into a thick film, a ceramic paste, or a film made of a composite with an organic resin to form an EL thin film layer on the upper inner wall of a canopy. It is characterized by being fixed.

Description of Examples Father-flow thin film type EL, which has been most actively developed in recent years
An example panel will be explained below.

Generally, an AC thin film type EL panel consists of a glass substrate with striped transparent electrodes, an insulator layer, a phosphor layer,
An insulating material layer and an aluminum stripe-shaped electrode intersecting with the striped transparent electrode are laminated in this order. Even if the insulating layer is left open on one side, it will not make any difference. In the present invention, the EL layer having such a structure is covered with a cap made of glass or an organic resin with a small space left, and one part of the cap is covered with a cap. , L layer side d+'V This is a blue V? - It has a structure in which it is colored to improve its light absorption ability and fixed in the form of a thin ceramic plate or a composite film with organic resin. The cap is adhesively fixed on the glass substrate at the end surface and has a structure that protects internal components from external moisture and dirt.

In the present invention, zeolite was selected and studied as a moisture absorbent that absorbs moisture within the cap covering the EL layer and quickly adsorbs moisture even if moisture enters the cap from the outside. The reason is as follows.

(1) Zeolite is a type of clay mineral that is not only stable but also harmless to other components of the EL panel.

(2) Selectivity for substances to be adsorbed; selectivity is determined by the pore distribution derived from the crystal structure of zeolite. For example, zeolites with a pore size of about 3 iye selectively absorb water in the air. Furthermore, even if zeolite with a large pore diameter is used, the ability to preferentially adsorb polar substances such as water is expected.

(3) Compared to silica gel and activated alumina, it has a large adsorption capacity even when the partial pressure of water is extremely low.

(■ Even at high temperatures (below room temperature), it has a larger adsorption capacity than activated alumina or silica gel.

- A method for coloring zeolite having the above advantages will be described below. As the coloring agent, 12 pieces of COS were used.

COCl2) A total of 50.7 kg of powdered zeolite was placed in 10 weight water 'FIio, 5R (7), and after moderate stirring, 1
It was left for 2 hours. After that, remove most of the water by passing E.
Put the cake-shaped powder into a dryer and heat it at 200°C.
Heated for 2 hours. As a result, a strongly blue-colored zeolite powder could be obtained. - The stronger the degree of dryness, the stronger the blue coloring, so the change in color can be used as a guide to the degree of dryness. The conditions such as the temperature and volume of the Co(-12 water solution, powder weight, immersion time, etc.) are not strict, and similar colored zeolite can be obtained under a fairly wide range of conditions.

The case where the cap is used as a cap will be explained below.

In the case of crow, it is more heat resistant than organic resin, so
The zeolite powder can be baked on the inner wall of the glass as a thick film.

A potash water glass aqueous solution having a concentration of about 7 was added to the mixed powder to form a paste suitable for printing coating, and the paste was applied to the inner wall of a glass cap to a thickness of about 10 to 200 μm. After drying at 150'C in a dry chamber, due to the activation of zeolite (deadsorption gas) and the adhesion of the face cloth membrane to the crow,
Heated at 35Q° C. for 2 hours in vacuum using a low coupon pump. Unlike the case of white zeolite powder, the colored zeolite thick film formed in this manner exhibits strong original absorption and can have a diffuse reflectance of 1% or less. Thereafter, a cap was placed over the AC oil film type EL layer in a dry atmosphere, and the end surfaces were adhered with a epoxy resin. The cross section of the completed EL panel of the present invention is shown in the figure. In the figure, 1 is a glass cap, 2 is a thick film of colored zeolite powder, 3 is an epoxy resin, 4 is a glass substrate, 5 is a transparent electrode, and 6 is ZnS: M
N is a phosphor layer, 7 is a Y2O3 insulator layer, and 8 is an L electrode on the back side. The EL panel constructed as described above does not have the drawbacks mentioned in the conventional structure and its problems, namely, the inside of the cap does not need to be filled with vacuum-squeezed silicone oil and is easy to manufacture. At the same time, contrast can also be improved. Rhinotes with all segments emitting light at the same time with a 5kHz+ sine wave)
As a result, the panel retained 90% of its initial brightness after 1000 hours, confirming that it was a great EL panel due to its moisture-resistant sealing effect.

Furthermore, in order to further reduce costs2, we considered using a plastic cap instead of the glass cap. In this case, it is impossible to burn the zeolite powder at 360℃ due to its low heat resistance, so 10 parts of 7% potash water bath liquid and 20% clay as an auxiliary binder are added to the colored zeolite powder. ,
This was press-molded into a flat plate with a thickness of 1 mm at a pressure of 5°C/c7zi, and then heated in a rotary vacuum at 5°C for 2 hours to form a ceramic shape. The ceramic circle thus prepared was attached to the inner wall of the epoxy/resin cap using Ehoquin resin adhesive to produce an EL panel having the same structure as shown in the figure. As a result, in a life test similar to that of the glass cap, it was confirmed that the cap retained 90% of its initial brightness after 10000 hours and had a long life.

Next, a method that is easy to implement for any sealed gear knob made of glass, plastic or metal will be described below. That is, a composite film with zeolite was prepared using an organic resin that relatively easily permeates water. Is the resin suitable for the above? Urethane was selected because it is durable and can withstand the temperature during zeolite activation. Urethane and zeolite were mixed in a N ratio of 1=3 to 1:4 to form a film with a thickness of 0.2 to 0.6 mm. The film is flexible, can be easily cut with a cutter, is not easily damaged, and is easy to handle.f) 4:12 points. Considering the heat resistance of the film thus produced, it was activated by degassing by heating it at 200° C. in a rotary vacuum for 2 hours.

Compared to ordinary powdered zeolite, the film had a slower moisture adsorption rate, but no difference in adsorption capacity.

The characteristics of being flexible and hard to break were retained even after the activation of the sword.

Such a composite film of zeolite and urethane resin was attached to the inside of an all-glass or plastinox seal cap to obtain life characteristics similar to those of the EL panel described above. The resin is not limited to the urethane mentioned above, but has appropriate moisture permeability and heat resistance, and has a one-cycle or 18iT capacity. For example, polyhinyl alcohol thread resin can also be used.

In this case, the temperature should be lowered a little to activate the scum removal.
It worked well for long periods of time at 0°C, and similar effects were confirmed.

Hereinafter, we have described a two-ac, seven-film type 1i1L panel, but it is clear that an EL panel with such a structure can also be constructed with an alternating current or direct current powder type or a direct current thin film type, and the effects of J will be the same. It is clear in principle.

Effects of the Invention As described above, the present invention makes the 00-colored zeolite powder into a thick film, ceramic, or composite film with a resin and fixes it to the inner wall of a seal cap, and seals the EL layer with moisture resistance using the cap. Since the EL panel has a fixed structure, this EL panel has excellent life characteristics, and at the same time, it can improve contrast, and is easy to manufacture due to its foldable structure.

In principle, the EL panel of the present invention may be of powder type, thin film type, alternating current type, or direct current type.

[Brief explanation of drawings]

The figure shows a partial cross-sectional view of a moisture-proof sealed crossed thin film type EL panel of the present invention. 1... Glass cap, 2... Thick film of colored zeolite powder, 3... Epoxy resin adhesive, 4... Glass substrate, 5... Transparent electrode, 6... Fluorescent material layer,
7... Insulator layer, 8... Back electrode.

Claims (4)

[Claims] (1) Zeolite colored by adding Cof) -If
An EL panel characterized in that it is fixed to the inner wall of a seal cap covering an EL thin film layer. (2) Claim 1 in which zeolite is in the form of a thick film
1 listed in 3ji! , L panel. (3) An EL panel as claimed in claim 1, in which zeolite is in the form of ceramic. (4) The EL panel according to claim 1, in which zeolite is formed into a film using an organic resin.