JPS6155238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a flexible electroluminescent lamp, particularly to a sealing operation of a light emitting element with a resin film.
The purpose is to improve the uniform sealing surface and ease of assembly.

Generally, a flexible electroluminescent lamp has a phosphor layer 3 or an insulator layer 4 interposed between a pair of flat electrodes 1 and 2, at least one of which is transparent, as shown in FIG. The light emitting element 5 is covered with resin films 8 and 9 having good moisture resistance from both sides, leaving a part of the electrode leads 6 and 7 connected to both electrodes 1 and 2, and the area between the resin films 8 and 9 on the periphery of the light emitting element 5 is covered. It has a sheet-like structure that is sealed and has excellent flexibility, so it is used in various shapes of display devices and liquid crystal backlights.

Such a resin-sealed flexible electroluminescent lamp is one in which a light-emitting element 5 is sandwiched between resin films 8 and 9 and heat-sealed by applying pressure from both sides using a heat press machine or a heating roller. Therefore, the sealing work is generally easy.

By the way, the length l of the sealed portion of the resin films 8 and 9 around the periphery of the light emitting element 5 is required to be at least about 0.5 mm in terms of adhesive strength and moisture resistance. The longer the length of the sealing part, the larger the non-emissive area will be, and the periphery of the display screen will become darker, especially for backlights such as liquid crystal displays, so the maximum length of the sealing part should be 1 mm to
It can be pressed down to about 2mm. For this reason, it is important to align the light emitting element and the resin film with each other during the sealing process. Conventionally, a sealing jig or the like was used to align each element one by one, and temporary adhesive was used to prevent the two from shifting. This led to inefficiency, and improvements were desired in this area.

The present invention has been proposed in view of the above, and provides an electroluminescent lamp that is easy to align a light emitting element and a resin film for sealing, and is excellent in mass production in which a large number of light emitting elements can be sealed in succession. A manufacturing method is provided.

The method for manufacturing an electroluminescent lamp according to the present invention provides an outer skin for sealing a light-emitting element, in which a plurality of strips of resin film are juxtaposed on a wide resin film, each of which is fixed on one side with each strip opening in the same direction. a process of forming
An element assembly step of inserting a light emitting element between resin films of the outer skin to obtain an assembly of the light emitting element, and an element obtaining a sealed body of the light emitting element by roll pressing the assembly from the fixed side of the outer skin. This method is characterized by including a sealing step and a cutting step of obtaining individual electroluminescent lamps by cutting the sealed body between the light emitting elements, in which the light emitting elements are placed between resin films fixed on each side. Due to the sandwiching structure, it is easy to assemble the device and is excellent for mass production, and since the resin films on the top and bottom of the outer skin are open, it has excellent effects such as uniform sealing without wrinkles during roll pressing. is obtained.

Embodiments of the present invention will be described in detail below with reference to the drawings. First, prior to the sealing work of the light emitting element, an outer skin 1 for sealing the light emitting element as shown in FIGS. 2 and 3 is prepared.
1 is created. This outer skin 11 is made of a fluorine-based resin film with good moisture resistance, and as shown in the figure,
A strip-shaped resin film 1 is placed on a wide resin film 12.
3 are arranged side by side, each right side is fixed and the left side is open and attached in a line. The outer skin body 11 having such a structure has each strip-shaped resin film 1
3 and the wide resin film 12 corresponding to this film 13 constitute the outer skin of the light-emitting element to be sealed, making it possible to seal a large number of light-emitting elements simultaneously or successively. To manufacture such an outer skin 11, strips of resin film 13 cut to a predetermined size according to the light-emitting element to be sealed are juxtaposed on a wide resin film 12, and the right side of each strip is adhered by heat-sealing or using an adhesive. Alternatively, after laminating two wide resin films and heat-sealing or adhering them at a predetermined pitch according to the dimensions of the light-emitting element to be sealed, one resin film is attached to the adhesive edge. It can be easily created by making an incision at the section.

Next, a plurality of strip-shaped resin films 13 are arranged side by side in this way, and each right side is a wide resin film 12.
As shown in FIGS. 4 and 5, the outer skin 11 fixed on the top has a light emitting element 14 inserted between each strip-shaped resin film 13 and wide resin film 12 from the opening side of each left side. assembled. The assembly of the light emitting element 14 to the outer skin 11 is carried out because the resin films 12 and 13 are fixed on the right sides, respectively.
The position of the light emitting element 14 can be easily regulated by abutting this fixed part, and if the width of the fixed part between each strip-shaped resin film 13 and the wide resin film 12 is kept constant, the sealing length can be adjusted. A constant light emitting device assembly 15 is obtained. In addition, since the light emitting element assembly 15 has a structure in which the light emitting element 14 is sandwiched between the two resin films 12 and 13, it is difficult to handle the light emitting element during assembly and subsequent steps. There is no need to worry about misalignment during the sealing process.
There is no need for complicated work such as temporary fixing between the light emitting element and the resin outer skin as in the past. Next, as shown in FIG. 6, the light emitting element assembly 15 in which the light emitting elements 14 are assembled in this manner is roll-pressed onto a heating roller 16 set at a predetermined sealing temperature. At this time, the rolling direction of the heating roller 16 should be such that the fixed side of the resin films 12 and 13 of the outer skin 11 faces the roll side, and the resin film 13 freely escapes from the heating roller 16 toward the opening side. , each strip-shaped resin film 13 is uniformly adhered to the surface of the light emitting element 14, and no wrinkles or the like occur.

FIGS. 7 and 8 show a sealed body 17 of light emitting elements rolled-pressed in this manner, in which a plurality of light emitting elements 14 are successively sealed in a flat plate shape with an outer shell 11. The sealed body 17 of the light emitting elements is put through a cutting machine (not shown) and cut and separated between the light emitting elements 14 (indicated by arrows in FIG. 8) to obtain an electroluminescent lamp as shown in FIG. It will be done.

As described above, the present invention involves attaching a plurality of strip-shaped resin films with at least one side open to a wide resin film in parallel when sealing a light-emitting element with a resin outer skin, and attaching these strip-shaped resin films and Since the light emitting element is sandwiched between wide resin films and roll pressed, element assembly is easy, the sealing dimensions can be regulated, and a uniform sealing surface can be obtained, making it possible to produce electroluminescent lamps with excellent mass production. We can provide manufacturing methods.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a flexible electroluminescent lamp, Figures 2 to 8 are parts in the process of manufacturing the electroluminescent lamp of the present invention for producing the electric field lamp shown in Figure 1, and Figure 2 is a front view of the outer shell. 3 is a sectional view taken along the - line in FIG. 2, FIG. 4 is a front view of the light emitting element assembly, FIG. 5 is a sectional view taken along the - line in FIG. 4, and FIG. 7 is a front view of the sealing process shown in FIG. 5, and FIG. 8 is a sectional view taken along the line - in FIG. 7. 11...Outer skin body, 12...Wide resin film,
13...Resin film strip, 14...Light emitting element, 15... Assembly, 17... Sealing body.

Claims (1)

[Claims] 1 A step of arranging a plurality of strip-shaped resin films on a wide resin film and fixing one side of each, a step of sandwiching a light emitting element between the fixed resin films, and a step of sandwiching the sandwiched resin films. A method for manufacturing an electroluminescent lamp, comprising the step of roll pressing from the fixed side.