JPH012296A - Method of manufacturing electroluminescent lamps - 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 a method for manufacturing an electroluminescent lamp, and more particularly to a method for forming a current collecting band on a transparent electrode in an organic electroluminescent lamp.

Organic electroluminescent lamps used as backlights for liquid crystal display devices
Hereinafter, it will be referred to as organic EL. ] is used. This E
L has a light emitting surface with an area slightly larger than the display surface of a liquid crystal display board, and it is a BL element in which a light emitting layer is sandwiched between a pair of opposing electrodes, at least one of which is transparent, and leads are led out from each electrode. It has a structure in which the EL element is sealed by sandwiching larger sized outer films from above and below, passing through a laminator, and heat-pressing the outer films that protrude from the EL element with the leads sandwiched between them.

A part of the structure and manufacturing method of the above organic type BL will be shown below with reference to FIGS. 4 to 8. FIG. 4 shows the organic type EL (1
), and FIG. 5 is a cross-sectional view taken along line A-A in FIG. 4. In FIGS. 4 and 5, (2) is a BL element,
3) and (4) are two resin outer skin films sandwiching and sealing the EL element (2) from above and below. As shown in Figure 6, the EL element (2) consists of a back electrode (5) of, for example, ^lfa, a highly reflective high dielectric constant material (titanic acid, etc.) on a high dielectric constant organic material (cyanoethyl cellulose, etc.) from the bottom layer of the drawing. A reflective insulating layer (6) in which powder of barium, etc.) is dispersed, a light-emitting layer (7) in which phosphor powder, such as ZnS:Cu, etc. is dispersed in the same organic material as mentioned above, and a transparent electrode (such as tn, o, etc.). 8
), a laminate of resin sheets (9) such as polyester, which will serve as the base material of the transparent electrode (8), is coated with a moisture-absorbing material (10
) (11), the transparent electrode (8) has a resistance value of about 500Ω/hole, so when the light emitting area exceeds a certain level, a band of silver paste etc. is applied to the transparent electrode (8). The current collecting band (8a) is formed by coating the current collecting band (8a). Back electrode (5) and current collecting band (8a) (or transparent electrode (8)
)], each has a belt-shaped reed (12) (13)
- ends of which are electrically and mechanically connected to the lead (12).
(13) is led out from the EL element (2) in parallel to the outside. The two outer skin films (3) and (4) are made of a fluororesin film with good moisture resistance coated with a low melting point polyethylene resin as an adhesive on the inner surface.
This is one size larger than the EL element (2), and the EL
The element (2) is sandwiched from above and below in a sandwich manner, and the parts protruding from the EL element (2) are bonded together by thermocompression.

When laminating and forming each layer of the EL element (2), first, as shown in FIG. A reflective insulating layer (6) and a light-emitting layer (7) are formed by sequentially applying a dispersed organic substance and an organic type substance containing phosphor powder to a constant thickness. As shown,
A resin sheet (9) having a transparent electrode (8) made of In103 or the like adhered thereto is prepared, and silver paste is further applied in a band shape onto the transparent electrode (8) to form a current collecting band (8a). Then, as shown in FIG. 7, a reflective insulating layer (6) and a light emitting layer (
7) A light emitting layer (
7) and a transparent electrode (8) facing each other, and a resin sheet (9)
Layer them together, and then apply moisture absorbing material (10) (11) from above and below.
), and the above-mentioned surrounds are bonded together by thermocompression by lamination processing to form the EL element (2) shown in FIG.

Incidentally, in the production of the EL element (2) described above, a silver paste is applied on the transparent electrode (8) to form the current collecting band (8a).
In forming the current collecting band (8a), screen printing is performed using a mask having a cut-out pattern matching the shape of the current collecting band (8a). Therefore, many types of masks are required depending on the shape and size of the current collecting band or the overall shape and size, and masks are required even for a small number of types, making storage and management of the masks troublesome. Furthermore, each time the product type changes, it is necessary to perform new positioning of the mask, which takes time to replace the mask, and furthermore, the positioning accuracy of the current collecting band is not sufficient. Furthermore, when a mask is used repeatedly, it gradually stretches and its dimensions become out of order, so there is a limit to the number of times the mask can be used repeatedly, and it usually becomes unusable after 4 to 5,000 times.

Solution to Problem 5 The present invention provides a method for manufacturing an electroluminescent lamp in which a reflective insulating layer, a light-emitting layer, and a transparent electrode are sequentially laminated and formed on a back electrode. The method is characterized in that a conductive agent is injected from a coating nozzle that is scanned in the x and Y force directions to form a current collecting band in a predetermined pattern.

According to the above technical means, it is possible to form a current collection band in a predetermined pattern on the transparent electrode of an organic EL without using screen printing, and a mask is not required.

The method for manufacturing an electroluminescent lamp according to the present invention is illustrated in FIGS. 1 to 3.
An example of its application will be described below with reference to the drawings. 1st
The figure shows a schematic plan view of a specific example of the current collecting IF coating means (17) according to the present invention, in which (14) is a silver paste coating nozzle, and (15) is an XY drive mechanism for the coating nozzle (14). , (16) is a transparent electrode film. Above X-
The Y drive mechanism (15) moves the application nozzle (14) in the direction of the arrow (X
) direction reciprocating X-scanning mechanism (15a);
Y to drive the scanning mechanism (15a) back and forth in the arrow (Y) direction
- a scanning mechanism (15b);
) is dispenser method, inkjet printer method,
Alternatively, a plotter method can be used. Then, a conductive agent such as silver paste is injected onto the transparent electrode film (16) from a coating nozzle (14), and a current collecting band is coated by controlling the format pattern using a computer.

That is, in the above configuration, first, as shown in FIG. 2, a transparent polar film (16) with transparent electrodes formed on the surface is supplied in roll form, cut into a desired size, and then coated with the cut edges as a reference. When the silver paste is injected while scanning the nozzle (14) in the XY force direction under computer control, the third
As shown in the figure, a predetermined pattern of current collecting bands (18) is formed on the transparent electrode film (16), and then the film is stored in a rack or the like and dried. So T, H Kaden Tei (18) can obtain any size and shape by simply changing the information input into the computer, and can produce many types of current collector strips with one device.
18). In addition, if the size and shape are significantly different, the nozzle may be replaced, or the coating means (17) may be used to mark black spots etc. on the transparent electrode film (16) or current collection band (18) using another nozzle. By doing so, this point can be automatically recognized in a subsequent process and used as a reference point to automatically perform cutting or other operations, making it possible to automate operations.

Furthermore, if an ultraviolet curable resin is mixed as a binder in a conductive agent such as silver paste, the transparent electrode film (16) can be coated with the collector band (18) in roll form, and then immediately irradiated with ultraviolet rays. It becomes possible to dry the current collecting band (18) and wind it up again into a roll, thereby making it possible to automate the current collecting band forming operation. In this case, if you mark black dots etc. on the transparent electrode film (16) etc. when applying the current collecting band, these dots will be automatically recognized in the later process and the problem will be solved! By making points 2, it is possible to automatically cut to a desired size. Alternatively, a conductive agent such as silver paste may be coated on the transparent electrode film (16) while it is in a rolled form, and black dots etc. may be marked on the transparent electrode film (16), and after coating, the film may be cut based on the black dots and dried. Furthermore, if the transparent electrode film (16) is fed in the X direction while still in roll form, it is only necessary to scan the application nozzle (14) in the Y direction.

According to the present invention, when forming a current collection band in a predetermined pattern on a transparent electrode of an organic EL, X
Since the conductive agent is injected from a coating nozzle that scans in the Y force direction to form a current collecting band, it is possible to form a current collecting band of any size and shape with one coating device, which greatly reduces work. This simplifies the process and improves dimensional accuracy.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an example of a collector band coating means used in the method for manufacturing an electroluminescent lamp according to the present invention, FIG. 2 is a perspective view of a rolled transparent electrode film according to the present invention, and FIG. The figure is a plan view of a transparent electrode on which a current collecting band is formed according to the present invention. FIG. 4 is a plan view showing a conventional example of an organic EL, FIG. 5 is a sectional view taken along the line A-A in FIG. 4, and FIG. 6 is a side sectional view of the EL element.
FIG. 7 is a side cross-sectional view showing one step of manufacturing the EL element shown in FIG. 6, and FIG. 8 is a perspective view showing a transparent electrode on which a current collecting band is formed. (1)--Electroluminescent lamp, (5)--Back electrode, (6)
-・-Reflective insulating layer, (7) -Emissive layer, (8) (1
6)...Transparent electrode, its film, (14)--coating nozzle, (15)--xy drive mechanism, (1B)--
1--Collector band. Patent applicant: Kansai NEC Co., Ltd.
Rito Ewara Shogo1 ′−
1-1 1st vrt, /'2 6th k
l & 7th N

Claims (1)

[Claims] (1) In the manufacturing process of an electroluminescent lamp in which a reflective insulating layer, a light-emitting layer, and a transparent electrode are sequentially laminated and formed on a back electrode, a coating nozzle scanned in at least one direction is applied to the transparent electrode to conduct electricity. 1. A method for manufacturing an electroluminescent lamp, which comprises injecting an agent to form a current collecting band in a predetermined pattern.