JPS58198893A - Method of producing el display element - 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 The present invention relates to an electroluminescent display element (hereinafter referred to as EL display element) in which a phosphor layer is sandwiched between a pair of electrodes, and a DC voltage is applied between both electrodes to cause the phosphor to emit light. ).

The phenomenon of emitting light when a voltage is applied to a phosphor made of zinc sulfide (Zn8) or the like and injected with activator or activator impurities is well known as electroluminescence (EL), and EL using this phenomenon is known as electroluminescence (EL). Luminescent P3 cords have been developed. EL light emitting elements have recently attracted attention as energy-saving light sources because they consume less power and generate less heat, and can be made very thin.

Furthermore, with the rapid digitalization of electronic equipment and the diversification of display formats, attempts have been made to put it to practical use as a PL light emitting cable display. However, if moisture is present inside the EL light emitting device, the decomposition of the phosphor such as zinc sulfide will progress and the brightness will deteriorate significantly, making it unusable as an EL display device. For this reason, when manufacturing an EL display element, sufficient care must be taken to ensure that no moisture is present inside the element.

FIG. 1 shows a typical EL display search element configuration, with fl
(2) is an organic transparent insulating film made of enalene trifluoride chloride, etc., and (2) is an EL formed by vapor-depositing mesh-shaped gold, aluminum, ITO (oxide of In and Sn), etc. on the transparent insulating film. A transparent electrode that allows light to pass through (314) is a phosphor powder made by injecting an activator or activator such as copper, manganese, aluminum, or chlorine bromine into zinc sulfide or zinc selenide. The phosphor layer is dispersed in an organic binder such as fluorocarbon resin, (4) is a counter electrode made of aluminum or gold foil or plate, and (5) is trifluorochloride enalene film alone or trifluoride. This is a moisture-proof protective film made by laminating and adhering a chlorinated enalene film and a polyethylene film.The transparent electrode (2
) and the counter electrode (4), the phosphor layer (3) emits light and displays, then the conventional BL
A method for manufacturing a display cord will be explained.

First, on a counter electrode (4) made of metal foil or metal plate such as aluminum, a paste for forming a phosphor layer, which is a mixture of cyanoenalized cellulose and phosphor powder, is applied and dried to form a phosphor layer (3). ) to form. Furthermore, transparent insulating film f
The transparent electrode (2) formed on the phosphor layer (3)
) and bonded by heating and pressing to produce an EL display element substrate.

Furthermore, the EL display 1 abandoned substrate is sandwiched between a moisture-proof protective film made by adhering a trifluorochloroethylene film alone or a laminate of a trifluorochloride enalene film and a polyethylene film, and then sandwiching it between the heating rolls. An EL display element was produced by passing through the glass and sealing with adhesive.

FIGS. 2(5) and 2(B) show an EL display element manufactured by a conventional assembly method, and are a front view and a sectional side view, respectively. As shown in Figure 2 (5), the EL display element manufactured using the conventional manufacturing method has both sides (non-display area) of the protective film (5) separated by 3 to 5 cabinets from the EL display element substrate in order to increase the moisture-proofing effect. I had to make it large. or,
As shown in Figure 2 (13), the EL display cord base (6)
When adhesively sealing the EL display element substrate (5) with the protective film (5), a void (force is likely to be generated) near the end of the EL display element substrate (6) and the void (7)
) easily absorbs moisture, reducing the reliability of the completed EL display cord 2
Lowering t:.

FIG. 3 shows an EL display element manufactured by a conventional method, in which the middle part of the display part has an opening, and (8) is the opening. A conventional method for producing this type of BL display cord is as follows. First, create the EL display element base in the opening,
The EL display element substrate is sandwiched between protective films and passed between heated rolls to be adhesively sealed. Next, the excess portions of the protective film (5) at the top and the openings are cut off to complete the HL display cord.

As shown in Fig. 3, this kind of EL display element manufactured by the conventional method has a protective film that is attached to the outer periphery and around the opening (8) (non-display area) to prevent moisture from forming on the EL display element substrate (6). They are also 3 to 51 mm large, so there are restrictions on the shape, and miniaturization is difficult. However, the conventional method is unsuitable for continuous manufacturing and mass production because the EL display cord base is cut or apertures are formed before moisture-proof sealing to create a complicated shape.

The present invention was made in order to eliminate assembly defects.
Continuous with no openings - By punching out the BL display cable base film formed into a two-one shape into an arbitrary shape and then sealing the ends with moisture-proof treatment, the upper body of the QEL display cable can be created. The object of the present invention is to provide a method for manufacturing EL display cords that have the same vertical dimensions, can be mass-produced easily, and are highly reliable.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

View-□L□□ Example 1 A transparent electrode made of indium oxide and tin oxide is formed on a hoop-shaped transparent insulating film made of a 0.1-thick polyester sheet by sputtering or vapor deposition. Next, a vehicle was prepared by mixing cyanoenalized cellulose and a solvent such as acetone, menalenalketone, or enal acetoacetate at a weight ratio of 1:1 to 10. The weight ratio of the injected phosphor powder to the cyanoenalized cellulose is 1:1 to 10.
A phosphor paste is prepared by adding Xg in a vehicle so that the following results are obtained. The phosphor paste is continuously dried on a cloth using a roll coater method, a printing method, or a spray method to form a phosphor layer so that the film thickness after drying is 10 to 50 μm. , to produce a hoop-shaped phosphor film. The phosphor film and a counter electrode made of a hoop-shaped aluminum foil having a thickness of 10 to 5011 fn are laminated and heated to 80 to 170°C while passing through a roll at a pressure of 10 to 80 Kf/crtl and pressed together to form a hoop shape. Create a luminescent film.

JP-A-58-198893 (≧V) For the roll used for crimping, silicone rubber with a thickness of 3 to 10 mm is used on the back side of the counter electrode to prevent strain during crimping due to surface unevenness of the phosphor layer. Next, the polyenalene sides of two hoop-shaped moisture-proof protective films, which are wider than the hoop-shaped luminescent film and are laminated with polyethylene trifluorochloride and polyethylene, are placed opposite each other, and 90 to 150 by inserting a luminescent film into the
A continuous hoop-shaped EL display element substrate film is produced by passing the film through a roll heated to 0.degree. C. and sealing it by pressure f:'f:r. Further, the hoop-shaped EL display element substrate film is punched into a predetermined shape using an Ares or the like and cut into sills to produce an EL display element substrate.

Finally, liquid enalene trifluoride chloride, which is melted from a hot melt gun that heats the EL display element substrate to 250 to 350°C, is cooled around the cut portion after whole blood to complete the EL display element.

4(A) and (B) are a front view and a cross-sectional side view of the EL display cable produced in this manner, respectively, and as shown in FIG. 4(A), the EL display cable base (6 ) Peripheral part and opening part (8) The peripheral part (non-display part) is also very small and compact, and as shown in the same figure (B), the EL display element base (6
) No voids occur near the edges either. Therefore, it is possible to manufacture a highly reliable EL display cable which can be miniaturized.

Note that (1) is a transparent insulating film, (2) is a transparent electrode,
(3) is a phosphor layer, (4) is a counter electrode, and (5) is a protective film.

Embodiment 2 FIG. 5 is a cross-sectional side view of an EL display element during the manufacturing process according to this embodiment. An EL display cable body was prepared in the same manner as in Example 1, and as shown in FIG.
9), and apply an umbrella-shaped sealing material made of enalene trifluorochloride to the opening (8). Next, a heater iron heated to 250 to 350° C. or hot air is blown onto the outer periphery and around the opening to melt and seal the sealing material t9), QO) to complete the EL display element. In this example as well, the completed EL display element is completely sealed around the periphery, and is small and highly reliable.

Note that (1) is a transparent insulating film, (2) is a transparent electrode,
(3) is a phosphor layer, (4) is a counter electrode, and (5) is a protective film.

Example 3 In the same manner as in Example 1, the peripheral area including the opening of the EL display element substrate is heated from above and below to 250 to 350°C using a heating beam such as a red tat beam. Moisture-proof protective film melts and flows to cover the cut surface.
After this, when the heating beam is removed, the peripheral area is cooled and a strong moisture-proof film made of enalene trifluoride chloride is formed.

As can be seen from the explanation on assembly, in the present invention, after producing the hoop-shaped EL display element substrate film, it is cut into a predetermined shape, and then the cut portion is subjected to moisture-proofing treatment, thereby achieving high mass production and further reducing the Since the display section can be made extremely small, there is a great degree of freedom in shape design, and there is a great advantage that a highly reliable BL display element substrate can be provided without creating a void at the end of the EL display cable body.

[Brief explanation of drawings]

Figure 1 is an enlarged cross-sectional side view of the main parts of an EL display element, and Figure 2 (5
) and (B) are a conventional example, respectively, a front view and an end cross-sectional side view of the EL display cord, and FIG. 3 is a conventional example of a BL with an opening.
4 is a front view of a display element, and FIG. 4 is an embodiment of the present invention,
The figure shows a front view of the EL display element, FIG. 5B shows an end cross-sectional side view, and FIG. 5 shows another embodiment of the present invention. (11 Transparent insulating film (2) Transparent electrode (3) Fluorescent layer (4) Counter electrode (5) Protective film (6j EL display cable base (7) Gap (8) Opening part (9), (10 ) Sealing material Fig. 2 (A) (B) ! Fig. 3

Claims (3)

[Claims] (1) A step of continuously forming a phosphor layer on a hoop-shaped transparent insulating film on which a transparent electrode of a predetermined shape is continuously formed on the surface to produce a hoop-shaped light emitting film, A step of press-bonding the luminescent film with a metal foil to produce a continuous hoop-shaped luminescent film, and sandwiching the luminescent film from above and below between two hoop-shaped protective films and sealing with heat and pressure to form a continuous hoop-shaped BL display element substrate. A step of producing a film, a step of punching and cutting the E'L display cable base film into an arbitrary shape to produce a BL display element base, and a step of sealing the periphery of the cut portion of the EL display cable base. A method for manufacturing an EL display element, characterized in that: (2) A patent claim characterized in that a film made of enalene trifluorochloride is used as the protective film, and a resin of the same material is heat-melted and applied to the periphery of the cut portion of the EL display element substrate for sealing. EL of the first term in the range of
A method for manufacturing a display element. (3) The method for manufacturing an EL display element according to claim 1, characterized in that a hot melt material is applied by heating and melting around the cut portion of the EL display element substrate for sealing. A method for manufacturing a BL display element according to claim 1, characterized in that: