JPH01231291A - Manufacture of el panel - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process by heat-melting a pair of sheets compression-formed from minute pellets while an EL element is sandwiched between the sheets, and simultaneously performing both forming of an outer coat film and sealing of the El element. CONSTITUTION:When minute pellets pass through between upper and lower compressing rollers 17, 17 arranged at the front of a blade 16, they are compress-formed to be long sheets 20 with a desired film thickness, which are cut in the similar form as an EL element and with an area larger than the same. Next, the platelike EL element 2 is sandwiched between the sheets 20, 20, while two parallel lead wires 3 extending from short edges thereof is introduced out. When it passes through between heating rollers 19, 19, it is heated and compressed from the upper and lower sides by the sheets 20, 20 and then the minute pellets 6 melt to form outer coat films 4, 4. Peripheral member 4a, 4b extending from the EL element 2 are fused and stuck each other, thereby the element is sealed. It is thus possible to simplify the manufacturing process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an EL panel, and more specifically, in manufacturing an EL panel used for a bank light of a liquid crystal display device, an EL element is covered with a skin film. Concerning a method of sealing.

A specific example of an organic fractional type EL panel used in a bank light or the like in a conventional blood crystal display device is shown in FIGS. 9 and 10 and will be described.

In the EL panel (1) shown in the figure, (2) is a plate-shaped EL element, and (3) (3) is two parallel pieces of phosphor bronze etc. led out from the short side of the EL element (2). Lead wires (4) (4) are outer films that sandwich and seal the EL element (2) from above and below. The above EL element (2) is
Although not shown, the luminescent layer of the phosphor is inserted into a transparent layer through an insulating layer.
r! It is sandwiched between the i-pole and the back electrode, and the lead wires (3) (3) are led out from the transparent electrode and the back electrode. The outer skin film (4) is a flexible film made of fluororesin or the like that has a larger area than the EL element (2), and is sandwiched between the EL element (2) in a sandwich style. The protruding peripheral part (4a) (4a)
By welding and fixing them together, the EL element (2) is hermetically sealed. The lead wires (3) (3) are led out from two locations around the outer skin film (4) (4).

The above EL panel (1) is manufactured using the apparatus shown in FIG. 1) and FIG. 12. Note that Figure 1) shows the manufacturing equipment for the outer skin film (4), and Figure 12 shows the manufacturing equipment for the outer skin film (4).
) shows the thermocompression bonding device.

1) In the manufacturing equipment shown in Figure 1, (5) is a large number of micro pellets (6) (6) which are the raw material for the outer skin film (4).
(7) is an extruder that heats and melts the micro pellets (6) (6) and sends them out, (8) is a molten raw material that flows down in the form of a film. T-die (9) (9) is a pair of cooling rollers arranged below the T-die (8), (10) is a spool for winding up the long outer skin film (4).

Next, in the thermocompression bonding apparatus shown in FIG. 12, (1))
(1)) is a pair of thermocompression rollers arranged above and below.
It is an elastic row with a built-in heater (not shown). (1
2) (12) is the above thermocompression roller (1)) (1
)) This is a feeding spool into which a long outer skin film (4) (4) is fed.

The production of the above-mentioned outer skin film (4) is carried out using micro pellets (6) supplied from a hopper (5) as shown in Fig. 1).
(6)... is heated and melted in an extruder (7) and sent out, and the molten raw material is allowed to flow down in a film form from a T-die (8). When this passes between the cooling rollers (9) (9), it is rapidly cooled to form a long outer skin film (4) having a predetermined thickness, which is wound around a take-up spool (10).

The feeding spool (12) (12) wrapped with the outer skin film (4) (4) thus obtained is then
As shown in Figure 2, the thermocompression roller (1)) (
The rotational force of the spool (12) (1))
The EL elements (2) are sequentially positioned and mounted on the outer skin film (4) from the lower spool (12), which is fed out from the lower spool (12). The EL element (2) passing between the thermocompression rollers (1)) (1)) is
The outer skin film (4) (4) is heated and pressed from above and below by the thermocompression roller (1)) (1)), and the peripheral portion of the outer skin film (4) (4) protrudes from the EL element (2). (4a) (4a) (Figures 9 and 10
(see figure) are welded together and sealed. A pair of long outer skin films (4) (4) are integrated while sealing the EL element (2) with this thermocompression roller (1)) (1))
is cut into a predetermined shape for each EL element (2), (2), etc. to obtain a desired EL panel (1).

i-mouth ()]

By the way, in the conventional manufacturing method of the EL panel (1) mentioned above,
Micro pellets (6) that are the raw material for the outer skin film (4)
(6) Forming the EL element (2) into a film, and forming the EL element (2) between the pair of outer skin films (4>(4)).
There are two heating steps: one is a step of thermocompression bonding while the other is sandwiched between the two. In such a heating process, when the fluororesin that is the raw material for the outer skin film (4) is heated to a high temperature, decomposition and crystallization progress, and the outer skin film (4) becomes bent and easily breaks, causing the product to deteriorate. The value of the product will be significantly reduced. In addition, the number of man-hours increases in manufacturing the EL panel (1), and the long outer skin film (4) must be manufactured once, and then the outer skin film (4) must be manufactured once.
) (4) After sealing the element (2), the outer film (4) (4) is cut into a predetermined shape, so the remainder of the outer film (4) (4) due to this cutting is There was a problem with parts being wasted.

Therefore, the present invention was proposed in view of the above problems.
The purpose of this is to decompose and decompose the raw materials for the outer skin film.
An object of the present invention is to provide a method for manufacturing an EL panel that suppresses crystallization as much as possible and makes effective use of raw materials.

-7ff' - The technical means for achieving the above object in the method of the present invention is to accumulate a large number of micro pellets, which are raw materials for the outer skin film, and press-form them into a sheet to form a sheet member of a predetermined size. and a step of sandwiching a plate-shaped EL element between a pair of sheet members, heating and melting the sheet members to form an outer skin film, and simultaneously sealing the EL element with the outer skin film. This is a manufacturing method.

According to the method of the present invention, the EL element is sandwiched between a pair of sheet members of a predetermined shape that are compression-molded from micro pellets, and the sheet members are heated and melted to form an outer skin film. Simultaneously sealing the EL element,
The manufacturing process is simplified by omitting the long outer skin film intermediate structure.

An example of an apparatus for carrying out the method of manufacturing an EL panel according to the present invention will be described with reference to FIGS. 1 and 3. Components that are the same as or corresponding to those in FIGS. 9 to 12 are given the same reference numerals, and explanations thereof will be omitted. In addition, FIG. 1 shows the sheet member forming apparatus.
FIG. 3 shows an apparatus for forming a skin film.

In the sheet member forming apparatus shown in FIG. 1, (15) is a conveyor belt, and (16) is a conveyor belt at a fixed position of the slope belt (15). Blades arranged above, (17)
(17) is a pair of pressure rows arranged above and below the conveyor belt (15).

Next, in the outer skin film forming apparatus shown in FIG.
8) is a conveyor belt, (19) (19) is a pair of heating rollers disposed above and below the conveyor belt (1B), which are elastic rollers with built-in heaters (not shown).

The EL panel (1) is manufactured using the above apparatus as follows.

First, as shown in Figure 1, a large number of micro pellets (6) (6), made of fluorine resin such as polytrifluorochloroethylene,
... is supplied to the position immediately in front of the blade on the conveyor belt (15). Then, by moving the conveyor belt (15), a fixed amount of minute pellets (6), (6), etc. are scooped out from a certain gap m between the lower end of the blade (16) and the conveyor belt (15).

Furthermore, micro pellets (6) are placed between the upper and lower pressure rollers (17) arranged in front of the blade (16).
(6) When ... passes through, its minute pellets) (6)
(6)... is pressure-molded to form a long sheet member (20) having a desired film thickness.Next, although not shown, the sheet member (20) is shaped into a desired shape and size. That is, it is cut into a larger area than that of the EL element (2) which will be described later. Even if there is any remaining portion at the time of cutting, it can be reused because it is only a small piece of pressure molded (6) (6)....

Sheet member (20) obtained in this way (20
), and as shown in Figure 2, prepare two sheets of the above sheet member (
20) A plate-shaped EL element (2) is sandwiched between (20), and two parallel lead wires (3) made of phosphor bronze or the like are connected to the outside from the short side of this EL element (2). derived. The EL element (2) is similar to the conventional one, in which a luminescent layer of phosphor is sandwiched between a transparent electrode and a back electrode via an insulating layer, and a lead wire (3) is connected from the transparent electrode to the back electrode. (3)
is derived.

Next, the sheet members (2o) and (20) sandwich the EL resistor (2) as described above, and as shown in FIG. supply sequentially. When the conveyor belt (18) passes between the upper and lower heating rollers (19) (19), the heating rollers (19) (19) move according to the shape of the EL element (2) as shown in FIG. This heating roller (1
9) In (19), the sheet member (20) (20) is heated from above and below, and the compressed micro pellets 7) (6) (6) of the sheet member (20) (20) are melted,
A skin film <4) (4) is formed. At the same time as this outer skin film (4) (4) is formed, this outer skin film (
4) The peripheral part protruding from the EL element (2) in (4) (
4a) (4a) are polymerized and the bolt (18) is fed between the (19) (19) made of a material with good thermal conductivity that deforms elastically in response to the heating roller (19) (19). Then, the outer film (4) (4) is formed and the EL element (2) is sealed to manufacture the EL panel (1) one by one.

Next, another example of an apparatus for implementing the present invention will be described.

As shown in FIG. 5, the sheet member forming apparatus consists of upper and lower pressure blocks (21), (21), and the upper surface of the lower pressure block (21), that is, the upper pressure block (
(6) (6)・
A recess (22) is formed according to the shape of the pressure molded. Further, as shown in FIG. 7, the outer skin film forming apparatus consists of upper and lower heating blocks (23) (23), which are elastic bodies with built-in heaters (not shown).

The EL panel (1) is manufactured using the above apparatus as follows.

First, as shown in Figure 5, a large number of micro pellets (6) (6) made of fluorine-based resin such as polytrifluorochloroethylene, etc.
* is supplied in a fixed amount to the recess (22) of the lower pressure block (21). And upper and lower pressure blocks (21) (2
1) relatively close to each other, and during the above period gI! The micro pellets (6) (6) in (22) are pressurized and formed into the shape of the recess (22) as shown in Fig. 6 to form a sheet member (20) with a desired thickness. . Next, as shown in FIG. 7, two sheet members (20
) (20) Position and place the EL element (2) on the lower heating block (23) with the EL element (2) sandwiched therebetween. still,
Said EL Keiko (2): It has the same configuration as that in the previous embodiment. And the upper and lower heating blocks (23) (23
) by moving the heating block (23) relatively close to each other.
(23) and sheet member (20) (20) and EL
Insert element (2).

At this time, the heating block (23) (23)
It is elastically deformed according to the shape of the L element (2), and the sheet member (20) (2) is heated in this heating block (23) (23).
0) is heated from above and below and compressed into a microscopic bellet l-
(6) (6) ... is melted, outer film (4) (4
) is formed. At the same time as the formation of the outer skin film (4) (4), the E of the outer skin film (4) (4) shown in FIG.
The peripheral part (4a) protruding from the L element (2) (4
a) are polymerized and welded together, and the EL element (2) is sealed with the outer film (4) (4) as shown in Figure 8.
L panel (1) is manufactured.

Effects of the Invention According to the method of the present invention, the formation of the outer film and the sealing of the EL element can be performed at the same time, simplifying the manufacturing process, and reducing the number of times of heat treatment of the raw material for the outer film. The decomposition and crystallization of the above-mentioned raw materials can be suppressed as much as possible, the elongation of the outer skin film can be maintained, and the raw materials can be used effectively, resulting in a significant improvement in commercial value.

[Brief explanation of the drawing]

1 to 4 are for explaining one embodiment of the method of the present invention, FIG. 1 is a schematic front view showing a sheet member forming apparatus, and FIG. 2 is a perspective view showing a sheet member and an EL element. ,
Figure 3 is a schematic front view showing the outer skin film forming device;
The figure is an enlarged partial sectional view taken along line A--A in FIG. 3. 5 to 8 are for explaining other embodiments of the method of the present invention, and FIGS. 5 and 6 are cross-sectional views showing the state of the sheet member forming apparatus before and after operation, FIG. 7 and FIG. 8 are sectional views showing the state of the outer skin film forming apparatus before and after operation. FIG. 9 is a plan view showing a specific example of an EL panel, FIG. 10 is an enlarged partial sectional view taken along the line B-B in FIG. 9, and FIG. 1) and FIG. 12 are conventional examples of the EL panel manufacturing method. 1) is a schematic front view showing an outer skin film forming apparatus, and FIG. 12 is a schematic front view showing an outer skin film thermocompression bonding apparatus. (1) - EL panel, (2) - EI, element, (4) - outer film, (6) - minute pellet,
(20) - Sheet member. Patent applicant Kansai NEC Co., Ltd. ---
, i 1), .: 'A, 1・1 O Sheet δPj: I Figure 3 (: Figure 4 Figure 5 Figure 6 Figure 71 Figure 8 υ・Dice!O1'1ff1

Claims (1)

[Claims] (1) A process in which a large number of micro pellets, which are raw materials for the outer skin film, are assembled and pressure-formed into a sheet to form a sheet member of a predetermined size, and a plate-shaped EL element is sandwiched between a pair of sheet members. ,
A method for manufacturing an EL panel, comprising the steps of: heating and melting a sheet member to form an outer skin film, and simultaneously sealing the EL element with the outer skin film.