JPH04209496A - Electroluminescence display device - Google Patents

Abstract

PURPOSE:To prevent the deposition of a connecting conductive layer on a colored layer, and improve a product quality by forming the colored layer on the external surface of an enclosure means at a position corresponding to a display section. CONSTITUTION:An electroluminescence element 27 is so constituted that an electroluminescence layer 24 is enclosed with dielectric layers 23 and 25 on a transference electrode 22, and many rear electrodes 26 are arranged on the layer 25 in a direction intersecting the electrode 22. A rear glass panel 28 as an enclosure means is bonded to a glass substrate 21 with a resin adhesive 29. Also, a colored resin layer 35 is printed on the upper surface 28a of the rear glass panel 28 at a position corresponding to a display area 38 formed with the electrodes 22 and 26. A gap 30 is filled with a mixture of insulation fluid 32, dye 33 and silica gel 34. The fluid 32 insulates the electrodes 26 from each other, and the silica gel 34 dehumidifies space in the gap 30, thereby preventing a drop in the characteristics of the layer 24 and the undesirable display thereof, due to the ingress of moisture in the layer 24 from a pinhole and a crack generated in forming a layer 25. A drop in the insulation quality of the electrodes 26 is also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an alternating current field type electroluminescent (hereinafter abbreviated as EL) display device.

In a conventional EL display device, an EL light emitting layer surrounded by a dielectric layer is interposed between transparent row electrodes arranged in a direction crossing each other and a column electrode such as AI. Display by matrix driving is performed by selectively driving the column electrodes.

FIG. 4 is a sectional view of a conventional EL display device 11.

A large number of parallel band-shaped transparent electrodes 2 are formed on a glass substrate 1, and a first dielectric layer 3 is formed on the transparent electrodes 2.
, a ZnS luminescent layer 4, and a second dielectric layer 5 are sequentially laminated, and a large number of parallel strip-shaped back electrodes 6 are formed on the dielectric layer 5 in a direction crossing the transparent electrode 2. It is set in. The above-mentioned transparent electrode 2, first dielectric layer 3,
An EL element 7 is composed of a ZnS light emitting layer 4, a second dielectric layer 5, and a back electrode 6.

On the glass substrate 1, a rear glass plate 8 is formed with a gap 10 having a depth of approximately 0.5 mm large enough to sufficiently cover the EL element 7 using a sand etching (sandblasting) method, and is coated with a resin adhesive 9. glued by. This void 10
An insulating fluid 12 containing dye 13 and silica gel 14 is filled inside. Further, a colored resin layer 15 is formed on the upper surface 8a of the rear glass plate 8.

The transparent electrode 2 protrudes from the back glass plate 8 to the glass substrate 1 to form a terminal 2a.The back electrode 6 also forms a terminal (not shown).

Problems to be Solved by the Invention FIG. 5 shows the terminal 2a of the EL display device 11 shown in FIG.
3 is a cross-sectional view showing immersion in solder 17. FIG.

When connecting the terminal 2a to a wiring board or the like, the terminal 2a must be immersed in solder 17 in a solder bath 16, as shown in FIG. In order to meet the strength required for connection with the wiring board, it is necessary to form solder 17 on the entire terminal 2a.
It is necessary to immerse it into the solder 17 to a depth of about 3 mm. This also applies to the terminals of the back electrode 6 (not shown).

Therefore, a part of the colored resin layer 15 is immersed in the solder 17,
A large amount of solder 17 pieces adheres to the colored resin layer 15. In the glass substrate 1, only a small amount of the solder 17 pieces adhere to parts other than the terminals 2a, and the adhered solder 17 pieces can be easily removed by Freon cleaning and wiping. However, the 17 pieces of solder attached to the colored resin layer 15 are difficult to remove by Freon cleaning and wiping, and the 17 pieces of solder remain on the colored resin layer 15.

Freon cleaning is a cleaning method in which after ultrasonic cleaning in a warm Freon solution, cleaning is performed using a Freon solution, and further cleaning is performed using Freon vapor.

These 17 pieces of residual solder will eventually detach from the colored resin layer 15 and adhere between the terminals 2a and the back electrode 6, causing a short circuit between the terminal 2a and the terminal of the back type FI6, or causing a wiring board failure. There is.

An object of the present invention is to provide an electroluminescent display device in which a connecting conductive layer does not remain in a colored layer and quality reliability is improved.

Means for Solving the Problems The present invention provides a light-transmitting substrate surrounded by a light-transmitting electrode formed on the light-transmitting substrate, and a dielectric layer disposed on the light-transmitting electrode. an electroluminescent element having an electroluminescent light emitting layer and a metal electrode formed on the dielectric layer; an enclosing means airtightly attached to the light-transmitting substrate and forming a space covering the electroluminescent element; , a filler made of an insulating fluid, a dehumidifier, and a dye filled in the space, and formed on the outer surface of the enclosing means in a portion corresponding to the display section formed by the transparent electrode and the metal electrode. an electroluminescent display device comprising: a colored layer; and a connecting conductive layer formed on a connecting terminal formed by drawing out the transparent electrode and the metal electrode to the outside of the display section. be.

Function According to the present invention, an electroluminescent display device comprises a transparent substrate, an electroluminescent element, a surrounding means, a filler, a colored layer and a connecting conductive layer. The electroluminescent element includes a light-transmitting electrode formed on the light-transmitting substrate, an electroluminescent light-emitting layer surrounded by a dielectric layer disposed on the light-transmitting electrode, and a light-transmitting layer formed on the dielectric layer. It has a metal electrode formed on the metal electrode. Further, the enclosing means is airtightly attached to the translucent substrate to form a space that covers the electroluminescent element, and the filler is made of an insulating fluid, a dehumidifier, and a dye filled in the space, The colored layer is formed on the outer surface of the enclosing means in a portion corresponding to the display area formed by the transparent electrode and the metal electrode, and the connecting conductive layer is formed on the outer surface of the enclosing means in a portion corresponding to the display area formed by the transparent electrode and the metal electrode. It is formed on the connecting terminal which is drawn out to the outside.

By forming a colored layer on the outer surface of the enclosing means in a portion corresponding to the display section, when forming a conductive layer for connection on the connection terminal by a dipping method, the conductive layer for connection is formed on the colored layer. Adhesion can be prevented.

Embodiment FIG. 1 is a sectional view of an electroluminescence (EL) display device 31 according to an embodiment of the present invention.

An EL element 27 is installed on a glass substrate 21 that is a transparent substrate. However, here, the EL element 27 is made of E
The L-emitting layer 24 is surrounded by first and second dielectric layers 23.25, and a back electrode, which is a large number of parallel metal electrodes, is provided on the second dielectric layer 25 in a direction intersecting the transparent electrode 22. Vi! 26 is comprehensively shown. To explain in more detail, the first dielectric layer 23 is Y2
O1, T i 02, Ae20s, Si3N+, S i
02, etc., and is formed by a sputtering method, an electron beam evaporation method, or the like. A Z layer is formed on the upper surface of the first dielectric layer 23 by electron beam evaporation.
An EL light emitting layer 24 is formed of an nS:Mn fired pellet or the like, and the first dielectric layer 1 is formed on the upper surface of this EL light emitting layer 24.
A second dielectric layer 25 made of the same material as 3 is formed. This second
On the dielectric layer 25, a large number of parallel strip-shaped back electrodes 26 made of a laminate of Al and Ni are formed by vapor deposition in a direction intersecting the transparent electrode 22, thereby forming an EL element 27.

On the glass substrate 21, a soda glass, borosilicate glass, or the like is formed using a sand etching (sandblasting) method to form a gap 30 with a depth of about 0.5 mm, which is large enough to sufficiently cover the EL element 27. A rear glass plate 28, which is an enclosing means, is bonded with a resin adhesive 29 such as a photocurable resin or an epoxy resin. The transparent electrode 2 of the EL element 27 is provided on the upper surface 28a of this rear glass plate 28.
A colored resin layer 35, which is a colored layer, is printed by screen printing or the like at a position corresponding to the display area 28, which is a display section formed by the display panel 2 and the back electrode 26. The colored resin layer 35 is made by dispersing dyes, pigments, carbon, etc. in a synthetic resin such as epoxy resin to make it black or E.
The light emitting layer 24 is colored in the same color as a dye 33, which will be described later, such as a complementary color to the light emitting color of the L light emitting layer 24. The void 24 is filled with a mixture of a filler such as an insulating fluid 32 such as silicone oil or grease, a dye 33, and a silica gel 34.

The transparent electrode 22 and the back electrode 26 protrude from the back glass plate 28 to the end 21a of the glass substrate 21 to form terminals 22a and 26a on the glass substrate 21. The terminal 22a of the transparent electrode 22 is formed by laminating AI, Ni, etc. on the transparent electrode 21.

The insulating fluid 32 provides insulation between the back electrodes 26 , and the silica gel 34 dehumidifies the space 30 .
This prevents deterioration of the characteristics of the EL light emitting layer 24 and undesirable display caused by moisture intrusion into the EL light emitting layer 24 through pinholes and microcracks generated during the formation of the dielectric layer 25, and also prevents the rear This prevents the insulation of the electrode 26 from deteriorating. Dye 33 is silica gel 34
It is added to prevent this because it gradually settles and becomes whiteish unevenly. Like the silica gel 34, this dye 33 gradually settles and causes color unevenness, so a colored resin layer 35 is formed on the upper surface 28a of the rear glass plate 28 in order to prevent this color unevenness. Therefore, as described above, the colored resin layer 35 is formed at a position corresponding to the display area 38 over a range described later.

FIG. 2 shows the solder 37 of the EL display device W31 shown in FIG.
3 is a cross-sectional view showing immersion in the EL display device 31 shown in FIG. 1. FIG. EL display device 31
The terminals 22a, 26a are immersed in solder 37 in a solder bath 36 to form solder 37 on the terminals 22a, 26a. At this time, it is necessary to cover the entire surface of the terminals 22a and 26a with the solder 37 in order to obtain the desired connection strength by the solder 37. For this purpose, not only the terminals 22a, 26a but also a portion of the back glass plate 28 must be immersed. The formation range of the colored resin layer 35 is selected so as to cover the display area 38 and not be immersed in the solder 37 when immersed in the solder 37. For example, the length of one piece of the glass substrate 21 is B3=220 mm, and the length of the other piece is A3.
= 150 mm, the length of one piece of the back glass plate 28 is B2 - 210 mm, and the length of the other piece is A2 = 140 mm.
When , the length B1 of one piece of the colored resin layer 35 = 200
mm, and the length A1 of the other piece is preferably about 130 mm, and this range is selected to be slightly larger than the display area 38.

Therefore, when immersing the solder 37, adhesion of the solder 37 to the colored resin layer 35 is prevented, and the immersed portion of the glass substrate 21 and the upper surface 28a of the rear glass plate 28 where the colored resin layer 35 is not formed is prevented from adhering to the colored resin layer 35. Hardly any of the solder 37 pieces adhere, and even if they do adhere, the solder 37 pieces can be easily removed by fluorocarbon cleaning or wiping.

As described above, according to this embodiment, the 37 pieces of solder do not adhere to the colored resin layer 35, thereby preventing a short circuit between the terminals 22a and 26a caused by the 37 pieces of solder and failure of the wiring board to be connected. I can do it.

Therefore, the quality reliability of the electroluminescent display device can be improved.

Effects of the Invention As described above, according to the present invention, in order to form a colored layer on the outer surface of the enclosing means in a portion corresponding to the display area formed by the transparent electrode and the metal electrode, the connection is made on the connection terminal by dipping. When forming the conductive layer for connection, adhesion of the conductive layer for connection to the colored layer is prevented.

Therefore, the reliability of the quality of the electroluminescent display device is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an EL display device 31 according to an embodiment of the present invention, and FIG. 2 is a solder 3 of the EL display device 31 shown in FIG.
7, FIG. 3 is a cross-sectional view showing immersion in E.
4 is a plan view of the L display device 31, FIG. 4 is a cross-sectional view of the conventional EL display device 11, and FIG. 5 is a cross-sectional view showing the EL display device 11 shown in FIG. 4 being immersed in the solder 17. 21...Glass substrate, 22...Transparent electrode, 22a. 26a...terminal, 23...first dielectric layer, 24...
EL light emitting layer, 25... Second dielectric layer, 26 peak back electrode, 27... EL element, 28... Back glass plate, 30
...Void, 31...EL display device, 32...Insulating fluid, 33...Dye, 34...Silica gel, 35...
・Colored resin layer, 37...Solder, 38...Display area Agent Patent attorney Kei Saikyo 12 Figure

Claims (1)

[Scope of Claims] A light-transmitting substrate, a light-transmitting electrode formed on the light-transmitting substrate, and an electroluminescent light-emitting layer surrounded by a dielectric layer disposed on the light-transmitting electrode. , an electroluminescent element having a metal electrode formed on the dielectric layer; an enclosing means airtightly attached to the light-transmitting substrate and forming a space covering the electroluminescent element; and filling the space. a filler made of an insulating fluid, a dehumidifier, and a dye; and a colored layer formed on the outer surface of the enclosing means in a portion corresponding to the display area formed by the transparent electrode and the metal electrode. An electroluminescent display device comprising: a connecting conductive layer formed on a connecting terminal in which the transparent electrode and the metal electrode are drawn out to the outside of the display section.