JPH0334289A - Membranous el display panel - Google Patents

Abstract

PURPOSE:To prevent the generation of a poor current flowing owing to a cutting of a back electrode by burying conductive terminals for drawing out the outer terminals of a membranous EL element in a glass base. CONSTITUTION:A matrix-form membranous EL element 22 is formed on a glass base 21 of a light-permeating property. A cover glass 28 is fixed to the glass base 21 with an adhesive 29 to compose an envelope 30. Stripe-form conductive terminals 40 are buried in the glass base 21, the one ends of a transparent electrode 23 and a back electrode 27 are extended to the near side of the connection position of the cover glass 28 to the glass base 21, and the extending ends and the conductive terminals 40 buried in the glass base 21 are superposed and connected. By such a constitution, the generation of a poor current flowing owing to a cutting of the back electrode can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film EL display panel, and more particularly to a matrix type thin film EL display panel for displaying various information.

[Conventional technology]

Matrix type thin film EL display panels generally have a glass package structure. An example of its structure will be described with reference to FIGS. 4(a>, (b)) and FIGS. 5(a), (b).

Note that FIG. 4(a) is a sectional view in the X direction, and FIG. 4(b) is a sectional view in the Y direction orthogonal to the X direction.

In FIGS. 4(a) and 4(b), reference numeral 1 indicates a light-transmitting glass substrate, and reference numeral 2 indicates a matrix type thin film EL element formed on the glass substrate 1. In FIG. In the thin film EL element 2,
3 is a large number of striped transparent electrodes formed by forming ITO (a mixed crystal of indium oxide and tin oxide) along the X direction at a predetermined pitch on a glass substrate 1 by vapor deposition or sputtering; 4 is a transparent electrode 3; A transparent first dielectric layer such as Y2O3 covering the top, and 5 a layer of XnS laminated on the first dielectric layer 4.
: A light emitting layer such as Mn, 6 a transparent second dielectric layer such as Y2O.3 covering the light emitting layer N5, and 7 a plurality of stripes formed on the second dielectric M6 at a predetermined pitch along the Y direction. This is the back electrode formed by the Aff vapor deposited film.

8 is an inverted dish-shaped cover glass that is fixed onto the glass substrate 1 via an adhesive 9 such as epoxy resin to hermetically seal the thin film EL element 2; The enclosure 10 is configured. In order to improve the moisture resistance of the thin film EL element 2, 11 is an insulating protective fluid such as silicone oil filled in the internal space of the envelope 10, and is injected through an injection hole 12 formed in a part of the cover glass 8. After injection, the injection hole 12 is sealed with a lid plate 13.

By the way, one end of each of the transparent mold i3 and the back electrode 7 is extended to the periphery of the glass substrate 1, and each extended end is connected to a terminal part 14, 15 formed on the periphery of the glass substrate 1. is connected in a superimposed manner. The terminal portion 14 on the side of the transparent electrode 3 disposed along the X direction is formed by overlapping the transparent electrode on the extended end of the pole 3, while the back electrode disposed along the Y direction On the terminal portion 15 on the side 7, an extended end portion of the back electrode 7 is formed to overlap. Reference numeral 16 denotes a flexible lead for externally extending the electrodes of the thin film EL element 2, which is made by adhering a large number of external leads 18 such as copper foil to a plastic film 17, and has a large number of terminal portions 14 exposed from the envelope 10. 1
The corresponding ends of the external leads 18 on the external leads 5 are electrically and mechanically connected by solder.

[Problem to be solved by the invention]

At the periphery of the conventional thin film EL element 2 described above, the back electrode 7 is bent as shown in FIG. There was a problem in that the thin film EL element 2 was cut at the h portion, making it impossible to conduct electricity to the thin film EL element 2 and significantly reducing reliability.

An object of the present invention is to provide a highly reliable thin film EL display panel in which the back electrode is not cut and electricity cannot be supplied to the thin film EL element.

[Means to solve the problem]

The present invention provides a thin-film EL display panel in which a thin-film EL element is enclosed in an envelope formed by bonding a glass substrate and a cover glass, in which conductive terminals for taking out external terminals are embedded in the outer periphery of the glass substrate. It is characterized by

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIGS. 1(a) and (b) are cross-sectional views in the X and Y directions of the first embodiment of the present invention, respectively, and FIGS. 2(a) and (b) are respectively FIGS. FIG. 3B is a partially enlarged cross-sectional view of the external terminal extraction portion of FIG. Figure 1 (a), (b) and Figure 2 (
a).

In (b), 21 is a transparent glass substrate;
2 is a matrix type thin film EL element formed on a glass substrate 21. 23 in this thin film EL element 22
2 is a striped transparent electrode formed of ITO at a predetermined pitch along the X direction by vapor deposition or sputtering; 24 is a transparent first insulating layer such as Y2O3 that covers the transparent electrode 23;
5 is a light emitting layer such as ZnS:Mn formed on the first insulating layer 24, and 26 is a transparent second layer such as Y2O3 covering the light emitting layer 25.
The insulating layer 27 is a back electrode made of a striped e-evaporated film formed on the second insulating layer 26 along the Y direction. Colored glass 28 is fixed to the glass substrate 21 with an adhesive 29, and constitutes an envelope 30 of the thin J14EL element 22. 40 is a strip-shaped conductive terminal embedded in the glass substrate 21. Conductive terminal 40 and transparent electrode 23. The back electrode 27 has the same pitch. One end of each of the transparent electrode 23 and the back electrode 27 is extended to the front side of the joining portion of the cover glass 28 to the glass substrate 21, and this extended end and the conductive terminal 40 embedded in the glass substrate 21 are connected in an overlapping manner. Ru. 31 is a dielectric protection fluid such as silicone oil filled in the inner space of the envelope 30 and is injected from an injection hole 32 formed in the cover glass, and after injection, the injection hole 32 is sealed with a cover plate 33. Reference numerals 34 and 35 indicate terminal portions connected in an overlapping manner to draw out conductive terminals. Reference numeral 36 indicates a flexible lead for externally extending the electrodes of the thin film EL element 22, and is made by forming a large number of external leads 38 such as copper foil on a plastic film 37 in the form of stripes, and is formed on the periphery of the glass substrate 21. Terminal section 34.35
The ends of the external leads 38 corresponding to the top are electrically and mechanically connected by solder.

FIGS. 3(a) and 3(b) are partially enlarged cross-sectional views of the external terminal take-out portion in the X direction and the Y direction, respectively, of the second embodiment of the present invention. In the second embodiment, as shown in FIGS. 3(a) and 3(b), the conductive terminal 40 has a transparent electrode 23 and a back electrode 27.
and a terminal portion 34 provided on the peripheral portion of the glass substrate 21.
The portion other than the portion that is overlapped and connected to 35 is completely buried in the glass substrate 21. This has the advantage that a groove 41 for adhering the cover glass 28 to the glass substrate 21 can be provided, making alignment easier.

〔Effect of the invention〕

As explained above, the present invention allows terminals of thin-film EL elements of a thin-film EL display panel to be drawn out of the envelope through conductive terminals embedded in the peripheral part of a glass substrate, which is not possible with conventional methods. This has the effect of eliminating the current conduction failure caused by cutting of the electrode extension portion for drawing out the terminals of the thin film EL element under the adhesive portion of the cover glass to the glass substrate.

[Brief explanation of drawings]

Figure 1 (a>, (b) is a sectional view in the X direction and Y direction of the first embodiment of the present invention, respectively, Figure 2 (a), (b)
1(a) and (b) are partial enlarged cross-sectional views of the external terminal take-out portion, respectively, and FIGS. 3(a) and (b) are views of the X-direction and Y-direction, respectively, of the second embodiment of the present invention. FIGS. 4(a) and 4(b) are partially enlarged cross-sectional views of an external terminal extraction portion, and FIG. 5(a) is a cross-sectional view in the X direction and Y direction of an example of a conventional thin film EL display panel, respectively. (1)) is a partial enlarged sectional view of the external terminal take-out part of FIGS. 4(a) and (b), respectively, and FIG. 6 is an enlarged sectional view of the main part illustrating the cut state of the extended portion of the back electrode. . 1.21...Glass substrate, 2,22...Thin film EL element, 3.23...Transparent electrode, 4,24...First dielectric layer, 5,25...Light emitting layer , 6.26...second
dielectric layer, 7, 27... back electrode, 8.28...
Cover glass, 9.29... Adhesive, 10.30...
・Envelope, 11.31... Insulating protective fluid, 12.3
2... Injection hole, 23, 33... Lid plate, 14, 15,
34.35...Terminal part, 16.36...Flexible lead, 17.37...Plastic film, ],
8.38... External lead, 40... Conductive terminal, 41...
··groove.

Claims (1)

[Claims] In a thin film EL display panel in which a thin film EL element is enclosed in an envelope formed by bonding a glass substrate and a cover glass, a conductive terminal for taking out an external terminal of the thin film EL element is embedded in the glass substrate. Characteristic thin film EL display panel.