JPS60249293A - Electric field light emitting lamp and method of producing same - 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 Field of Industrial Application The present invention relates to an electroluminescent lamp and a method for manufacturing the same, and more particularly, an electroluminescent lamp element having a current collecting band along one side edge is formed by folding a resin outer film into a folded state. The present invention relates to an electroluminescent lamp that is heat-sealed and suitable for backlights of liquid crystal display devices, etc., and a method for manufacturing the same.

Conventional liquid crystal display devices are non-emissive, and therefore Varicrite is used. This backlight uses organic electroluminescent lamps (hereinafter referred to as
(abbreviated as KL) has been awarded the award. For example, as disclosed in Japanese Patent Publication No. 86-8479, this type of EL has an EL element sandwiched between two resin outer films and sealed by thermocompression, but it is said to have poor moisture resistance. There were drawbacks. Therefore, as disclosed in Japanese Patent Publication No. 40-857-5, moisture-absorbing films were placed above and below the EL element, and the EL element was sandwiched between two resin outer films and sealed by thermocompression to improve moisture resistance. Civilization is proposed.

FIG. 14 shows a plan view of the above KT, and FIG. 15 shows a sectional view taken along the line XV-XV in FIG. 14.

In the figure, 1 is an EL element, with moisture absorbing films 2.3 placed above and below it, sandwiched between resin outer films 4. Crimp sealed. As is clear from FIG. 15, the E-L element 1 has a high dielectric constant material such as barium titanate and a high dielectric constant material such as barium titanate contained in a high dielectric constant organic material such as cyanoethyl cellulose on a back electrode 6 made of aluminum foil or the like. Reflective insulating layer 7 in which white insulating substance powder is dispersed
A light-emitting layer 8 in which phosphor powder such as ZoS:Cu is dispersed in an organic substance similar to the above, and a resin film 10 made of polyester or the like with a transparent electrode 9 made of In, O, etc. formed on the lower surface are laminated. The transparent electrode 6 is formed with a current collecting band 11 coated with a silver base or the like, and the current collecting band 11 and the back electrode 6 are provided with leads 12 made of a phosphor bronze thin plate or the like.
18 are connected. In addition, the moisture absorbing soil 2.
3 is a resin film 14.15 made of a polyamide condensate known under the trade name Nylon-6, for example, and an adhesive layer made of a polyamide condensate known under the trade name Nylon-12. 16.17 was formed. Further, the resin outer film 4.5 is formed by forming an adhesive layer 20.21 made of polyethylene or the like on one side of a resin film 18.19 made of, for example, chlorinated ethylene or the like.

If the resin outer films 4 and 5 have a structure in which the adhesive layers 20 and 21 are sealed together by thermocompression, as in KL above, the sealing dimension A of the resin outer films 4 and 5 is required to be 2ffi+++ or more. There is. In addition, resin outer film 18.19
When directly sealing them by thermocompression, the above sealing dimension A is 1
It may be above 100%, but the thermocompression sealing temperature is high and the luminescent layer is 8.
The disadvantage is that it easily deteriorates.

Problems to be Solved by the Invention By the way, if the sealing dimension A is set to be the same on each of the four sides of the EL, this sealing dimension A will naturally become a non-light-emitting part, but the part of the current collecting band 11 will also be a current collecting band. As a result of the light emission being blocked by 11, it becomes a non-light emitting portion in fact. Therefore, the dimension B of the non-light-emitting portion at the side end where the current collecting band 11 is formed is larger than the sealing dimension A. Therefore, the above K
In the case of L, the external dimensions of the ET are large compared to the light emitting area, and the dimensions of the non-light emitting part are different between the side ends with and without the current collecting band 11, and the problem is that the light emitting part is not in the center of the EL. was there.

In the first invention, a KL element having a current collecting band along the negative side edge is sandwiched between two-fingered resin outer film so that one side edge is in close contact with the inner surface of the second finger part, and heated. It is characterized by being crimped and sealed.

In the second invention, a KL element having a current collecting band along the - side edge is sandwiched between two folded resin outer films so that the - side edge is in close contact with the inner surface of the second finger part. Then, after heating and pressurizing the EL element to temporarily fix it to the portion near the secondary part, the temporarily fixed body is passed through a thermocompression roller to thermocompress and seal the resin outer films together. It is.

-Flaw 1- According to the first invention, the resin outer soil rem is folded in half at the side end where the current collecting band is formed, and the E
Since the dimension from the edge of L to the edge of the EL element is as small as the thickness of the resin outer film, the dimension of the non-luminous part formed by the current collecting band and the dimension of the non-luminous part on the opposite side are close to each other. As a result, an EL having a small outer size relative to its light emitting area can be obtained, and the light emitting portion of the EL element can be located in the center of the EL.

Further, according to the second invention, by temporarily fixing the folded resin outer film and the EL element, the temporarily fixed body can be passed through a thermocompression roller to thermocompress and seal the resin outer films. When doing so, only the resin outer film is held between the thermocompression rollers, and the relative position between the resin outer film and the EL element does not shift, and the EL element of the first invention can be produced efficiently and with high dimensional accuracy. Can be manufactured.

Embodiment FIG. 2 shows a plan view of the EL of the first invention, and FIG. 3 shows an enlarged sectional view taken along line III-m in FIG.

14 and 15 except for the following points.
Since it is similar to the figure, the same parts are given the same reference numerals. The difference between FIG. 14 and FIG. 15 is that the resin outer film 22 is folded in half at the side edge where the current collecting band 11 of the PL element 1 is formed; The resin outer films 22 are sealed together by thermocompression at the side ends. This resin outer film 22 is made of, for example, a resin film 23 made of trifluorochloroethylene or the like.
An adhesive layer 24 made of polyethylene or the like is formed on the inner surface of the holder, and in more detail, the adhesive layers 24 are sealed together by thermocompression. In this way, when the resin outer film 22 is folded in half at the side end where the current collecting band 11 is formed and sealed by thermocompression, the non-light-emitting portion of the resin outer film 22 on the current collecting band 11 side The size of C becomes extremely small depending on the thickness of the resin outer film 22, and even if there is a non-light-emitting part due to the current collecting band 11, the size C of the total non-light-emitting part is the same as the heat between the resin outer film 22 on the opposite side. This is approximately the same as the dimension B of the non-light-emitting portion formed by pressure sealing. Therefore, not only can the external dimensions of the EL be made small in relation to the light emitting area, but also the light emitting portion can be located in the center of the EL.

By the way, when the above-mentioned ET is manufactured using a flat plate type heat press machine, bubbles may be packed depending on the flatness of the heat press machine, etc.
The problem is that the removal process is troublesome and time consuming, making it unsuitable for mass production. Therefore, it is conceivable to perform continuous thermocompression sealing using thermocompression lobes. However, when such a method is adopted, the following new problems arise.

4 and 5 show cross-sectional views at different stages of the method described above. In the figure, 25 and 26 are thermocompression rollers,
Hard rubber 29.80 is fixed to the outer periphery of each pipe 27.28 made of stainless steel or the like, and alumina is placed inside the pipe 27.28.

Insulating powder such as magnesia 81.82 and heater 33°84
It has a built-in device and can be rotated in the direction of the arrow in the figure. Then, the laminate of the ELL child 1 and the moisture-absorbing film 2.8 is supplied to the inner surface of the second finger portion of the folded resin outer film 22 in the direction of the arrow shown in the figure, and the laminate is passed between the thermocompression rollers 25 and 26. In this way, the resin outer film membranes 22 are sealed together by thermocompression. However, as shown in FIG. 5, when the two fingers of the resin outer film 22 are wedged between the thermocompression rollers 25 and 26, only this resin outer film 22 is pulled between the thermocompression rollers 25 and 26. , the FiL element 1 is a little later than the thermocompression roller 25.26
It is easy to get caught between the two.

If, like this, the resin outer film 22 and the EL element 1
If slippage occurs between the two, the desired EL cannot be obtained. FIG. 6 shows a plan view of such an undesired 1EL, and FIG. 7 shows an enlarged cross-sectional view taken along the line ■--■ in FIG. That is, the resin outer film 22 and KLL
If slippage occurs between the KL and the collector 1, the collector band 11 of the KL
The size of the non-light-emitting part on the side increases and the sealing dimension E on the opposite side decreases, so not only is the light-emitting part no longer located in the center of the EL, but also the moisture resistance decreases due to the decrease in the sealing IL dimension E. descend. Cut resin outer film 22 and KLL
In order to obtain a sufficient sealing dimension on the side opposite to the current collecting band 11 even if slipping occurs with the child 1, if a resin outer film 22 with a large size is used in advance, the resin outer film 22 may be The amount used will increase, causing an increase in costs.

Figures 8 to 10, Figure 1, Figures 11 to 13
The figures show ELL children 1 to F at different stages for explaining the manufacturing method of the second invention that solves the above problems.
A plan view or a cross-sectional view of iL is shown.

First, a laminate in which absorbent 10-wet films 2.3 are placed above and below the ELL child 1 is manufactured in the same manner as in the conventional method (FIGS. 8 and 9). Next, prepare the resin outer film 22 which has been folded in half, and fold the resin outer film so that the side edge where the current collecting band 11 of the element 1 is formed is brought into close contact with the inner surface of the folded part. Insert KT and element 1 between 22 (FIGS. 10A and 10B). In this state, from the outside of the resin skin film 22, heat and pressure are applied to the diagonally shaded portion 35 along the side edge where the current collecting band 11 of the element 1 is formed, and the EL element 1 and the moisture absorbing film 2.3 are laminated. The body and the resin outer film 22 are temporarily fixed (FIG. 1A and FIG. 1B). Next, this temporarily fixed body is placed on a thermocompression roller 2.
During 5.26, the resin outer film 22 and the EL element are passed through from the temporarily fixed side end side and the resin outer film 22 protruding from the KL element 1 is sealed by thermocompression (Fig. 11).C Then, the resin outer film 22 and the EL element 1 and moisture absorbing film 2, 3
Since the laminate is temporarily fixed, there is no slippage between the resin outer film 22 and the laminate, and the EL element 1
The dimension F of the non-light-emitting portion of the current collecting band 11 becomes the minimum, and accordingly, the sealing dimension G on the opposite side also becomes a sufficient size. Therefore, an EL can be obtained which has small external dimensions relative to the light emitting area, has a light emitting portion located in the center of KL, and has excellent moisture resistance (FIGS. 12 and 13).

In addition, although the said Example demonstrated the case where the moisture absorption film 2.3 is used, the case where the moisture absorption film 2,8 is not used is also the same.

Effects of the Invention According to the first invention, a PL can be obtained in which the light emitting portion is located in the central portion and the external dimensions are small in relation to the area of the light emitting portion.

According to the second invention, a thermocompression roller suitable for mass production is used to prevent slippage between the resin outer film and the EL element, and the light emitting part is located in the center, and the area of the light emitting part is small. EL with relatively small external dimensions and excellent moisture resistance can be manufactured efficiently and accurately.

[Brief explanation of drawings]

FIG. 1A is a top view of a one-stage electroluminescent lamp of the second invention, and FIG. 1B is a side view thereof. FIG. 2 is a plan view of an electroluminescent lamp according to an embodiment of the first invention, and FIG. 3 is an enlarged sectional view taken along line I-Ill in FIG. 2. 4 and 5 are cross-sectional views at different stages to explain an efficient method of manufacturing the electroluminescent lamp of FIG. 2 and its problems. FIG. 6 is a plan view of an undesired "electroluminescent lamp" manufactured by the above method, and FIG. 7 is an enlarged sectional view taken along the line ■-■ in FIG. 6. Figure Fi shows a plane (2) or cross-sectional view of an electroluminescent lamp element or an electroluminescent lamp at different stages for explaining the manufacturing method of the second invention, and Fig. 8 shows a laminate of an electroluminescent lamp element and a moisture absorbing film. Plan view, No. 9
The figure is an enlarged sectional view taken along the line - in Fig. 8, Fig. 10A is a plan view showing the electroluminescent lamp element and the laminate of the moisture-absorbing film sandwiched between the folded resin outer film; 10
Figure B is a side view, Figure 11 is a cross-sectional view of the electroluminescent lamp element, moisture absorption film laminate and resin outer film before being passed between a pair of thermocompression rollers, and Figure 12 is the The plan view of the electroluminescent lamp after crimping and sealing, Figure 18, is the same as ■-■ in Figure 12.
FIG. 3 is an enlarged cross-sectional view taken along the line. FIG. 14 is a plan view of a conventional electroluminescent lamp, and FIG. 15 is an enlarged sectional view taken along line XV-XV in FIG. 14. 1・・・・・・・・・・・・・・・・・・・・・・・・
・Electroluminescent lamp element, 2.3・・・・・・・・・・・・・
・・・・・・Moisture absorbing film, 6・・・・・・・・・・−・
・・・・・・・・・Back electrode, 8・・・・・・・・・・・・
.........Light-emitting layer, 9...
・・・・・・・・・・・・・・・Transparent electrode, 11...
・・・・・・・・・・・・・・・・Collector band, 22・
・・・・・・・・・・・・・・・・・・Resin outer film, 25.26・・・・・・Thermo compression roller, 35・・・・・・・・・・・・・・・・・・・・・・・・
Temporary fixation part/patent applicant Kansai NEC Co., Ltd. 14-

Claims (1)

[Scope of Claims] l An electroluminescent lamp element having a light-emitting layer sandwiched between a pair of electrodes, at least one of which is transparent and having a current collecting band along one side edge, is folded in two.1. between the resin outer film,
An electroluminescent lamp formed by sandwiching one end of a current collecting band so that it is in close contact with the inner surface of a bifold part and sealing it by thermocompression. 2. A step of manufacturing an electroluminescent lamp element in which a luminescent layer is sandwiched between a pair of electrodes, at least one of which is transparent and has a current collecting band along one side edge; , a step of sandwiching the two-folded resin outer film so that one end of the current collecting band is in close contact with the inner surface of the two-fold part; and a step of sandwiching the resin outer film in the vicinity of the two-fold part and the electroluminescent lamp element. and a step of temporarily fixing them by applying heat and pressure, and passing the temporarily fixed body through a pair of thermocompression rollers to thermocompress and seal the resin outer films protruding from the remaining side edges of the electroluminescent lamp element. A method of manufacturing an electroluminescent lamp, including a process.