JPH0645291U - EL element - Google Patents

Abstract

(57) [Abstract] [Purpose] A light emitting layer is sandwiched between a pair of electrodes, at least one of which is translucent, and is surrounded by a base sheet that is isolated from the ambient atmosphere. By applying a voltage to the electrodes and by providing a conductive layer that connects the wiring cord from the external drive circuit outside the region of the light emitting part, the area of the light emitting part becomes the light emitting area as it is, and the degree of freedom of the shape of the light emitting part increases. . [Structure] A pair of electrodes 1, 15 at least one of which is transparent
The light emitting layer 3 is sandwiched therebetween to form the light emitting section 11. The light emitting section (11) is surrounded by a pair of base sheets (16, 17) at least one of which is transparent. Electrodes 1 and 15 are provided on the inner surfaces of the base sheets 16 and 17, respectively.
Electrodes 1,15 that are in contact with but not in contact with each other
A pair of conductive layers 16, at least one of which has a terminal 16a for applying a voltage
Provide 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lead-out structure of a terminal in an electroluminescence (hereinafter referred to as EL) element.

[0002]

[Prior art]

 An EL element in which a light emitting layer exhibiting an EL phenomenon is sandwiched by electrodes is disclosed in Japanese Patent Laid-Open No. 62-52884, and as shown in FIGS. A light emitting layer 3 formed by mixing an insulator layer 2 made of yttrium oxide, silicon nitride or the like on the electrode 1, and a base material such as zinc sulfide added with an emission center such as manganese in a binder such as cyanoethyl cellulose. Are sequentially laminated by a screen printing method or the like, while a transparent electrode 4 made of tin oxide, indium oxide or the like and a current collecting band 5 made of silver pace or the like are provided around the outer surface of the transparent electrode 4. A transparent sheet 6 made of a polyester film or the like is formed on one surface by vapor deposition or sputtering, and the transparent electrode 4 is arranged on the light emitting layer 3 so that the transparent electrode 4 is in contact with the light emitting layer 3. A pair of lead pieces 9 and 10 to be terminals are connected to the collector band 5 connected to the transparent electrode 4 with the adhesive tapes 7 and 8. After pulling out the lead pieces 9 and 10 in the circumferential direction, the back electrode A thin flat plate EL element 14 is formed by surrounding the entire light emitting portion 11 composed of 1 to the transparent sheet 6 with a pair of base sheets 12 and 13 made of a transparent polymer film with an adhesive and performing a lamination treatment. Has been formed. Then, by connecting a wiring cord (not shown) from an external drive circuit (not shown) to the lead pieces 9 and 10 and applying a predetermined voltage, the light emitting layer 3 between the back electrode 1 and the transparent electrode 4 is connected. Emits surface light.

[0003]

[Problems to be solved by the device]

 Since the back electrode 1 and the transparent electrode 4 are thin and weak materials, it is not possible to directly connect a wiring cord from an external power source to them by soldering, etc. Therefore, as described above, the back electrode 1 and the transparent electrode 1 have been conventionally used. The lead strips 9 and 10 having sufficient strength of copper foil or the like and capable of connecting the above wiring cords are fixed to the collector band 5 connected to the transparent electrode 4 with the adhesive tapes 7 and 8. Since the band 5 and the adhesive tape 8 are non-translucent, the area that covers the light emitting layer 3 increases as the area increases, and the light emitting area of the light emitting section 11 decreases accordingly. There is a problem that the shape of 11 is limited, and the designability and commercialability of the EL element 14 are impaired.

[0004]

[Means for Solving the Problems]

 The present invention focuses on the above-mentioned conventional problems, in which at least one light-emitting layer sandwiches a light-emitting layer between a pair of translucent electrodes, and the light-emitting layer emits light in response to a voltage applied to the electrode. Section and a pair of base sheets, at least one of which is transparent to the ambient atmosphere, that separates the light emitting section from the ambient atmosphere, and a pair of base sheets that are provided on the inner surface of the base sheet and that are in contact with the electrodes and are not in contact with each other, and a voltage to A connection terminal to an external drive circuit for applying a voltage is provided outside the region of the light emitting portion, and at least one of the connection terminals has a pair of translucent conductive layers.

[0005]

[Action]

 Since the terminal of the conductive layer provided on the base film is outside the region of the light emitting portion, the area of the light emitting portion becomes the light emitting area as it is, and the degree of freedom of the shape of the light emitting portion increases.

[0006]

【Example】

 The present invention will be described below with reference to the embodiments shown in FIGS. 1 and 2, but the same or corresponding parts in the conventional example will be designated by the same reference numerals and detailed description thereof will be omitted.

The insulator layer 2 and the light emitting layer 3 are sequentially formed on the back electrode 1, and on one side of the light emitting layer 3, indium oxide as a conductive fine powder having a visible light transmitting property is formed. A conductive paste dispersed in cyanoethyl cellulose as a resin is formed by printing to form a transparent electrode 15, and a back electrode 1, an insulator layer 2, a light emitting layer 3, and a transparent electrode 15 form a light emitting portion 11. Then, on the inner surface of the base sheets (polyester film) 12 and 13 that cover the light emitting portion 11, a coating type ITO (indium oxide / tin alloy) is formed in a shape that is in contact with the back electrode 1 and the transparent electrode 15 and does not contact each other. Conductive layers 16 and 17 are formed by vapor deposition or sputtering, etc., and a part of these conductive layers 16 and 17 are located outside the region of the light emitting section 11 for connection with an external drive circuit (not shown). The terminals 16a and 17a are provided, and after applying an adhesive (not shown) to the peripheral portions of the inner surfaces of the base sheets 12 and 13, the EL element 14 without lead pins is formed by laminating.

When a wiring cord (not shown) from the external driving circuit is connected to the terminals 16a and 17a of the conductive layers 16 and 17 and a predetermined voltage is applied, the light emitting layer 3 between the back electrode 1 and the transparent electrode 15 Emits surface light, and one surface of the EL element 14 appears to shine through the transparent electrode 15, the conductive layer 17, and the base sheet 13.

Although not shown, the lead sheets 9 shown in FIG. 3 and FIG. 4 are formed on the peripheral portions of the conductive layers 16 and 17 located outside the area of the light emitting portion 11 without protruding the base sheets 12 and 13. , 10 may be fixed with adhesive tapes 7, 8 to form the EL element 14 as these terminals 16a, 17a.

In addition, the conductive layers 16 and 17 are coated with the current collector 5 shown in FIGS. 3 and 4 to strengthen the conductive layers 16 and 17, or the base sheets 12 and 13 are laminated with a moisture-proof film (not shown). Then, the moisture-proof effect can be enhanced.

Needless to say, the conductive layers 16 and 17 are not limited to the shapes of the embodiments, and may have any shape as long as the back electrode 1 and the transparent electrode 15 are not short-circuited.

The back electrode 1 can also be formed at the same time as the transparent electrode 15 so as to have translucency, and at least one of the pair of electrodes 1 and 15 need only be translucent. Accordingly, at least one of the pair of base sheets 12 and 13 and the conductive layers 16 and 17 may be transparent.

[0013]

[Effect of device]

 According to the present invention, a light-emitting layer is sandwiched between a pair of electrodes, at least one of which is transparent, and the light-emitting layer emits light in response to a voltage applied to the electrode, and at least one of which isolates the light-emitting section from the surrounding atmosphere. A pair of translucent base sheets, and a connection terminal with an external drive circuit for applying a voltage to the electrodes that is in contact with the electrodes provided on the inner surface of the base sheet and does not contact each other. At least one of the light emitting portions outside the region has a pair of translucent conductive layers, and the light emitting area can be reduced without covering the light emitting portion with a current collecting band or adhesive tape. It can be used all at once and enhances the design and marketability of EL devices.

[Brief description of drawings]

FIG. 1 is an exploded sectional view of an EL device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same EL element.

FIG. 3 is a sectional view of an EL element showing a conventional example.

FIG. 4 is a rear view of the same EL device.

[Explanation of symbols]

 1 Back electrode 2 Insulator layer 3 Light emitting layer 11 Light emitting part 12, 13 Base sheet 14 EL element 15 Transparent electrode 16, 17 Conductive layer 16a, 17a Terminal

Claims (1)

[Scope of utility model registration request] 1. A light-emitting portion, at least one of which is translucent, sandwiches a light-emitting layer between the pair of electrodes, and the light-emitting layer emits light in response to a voltage applied to the electrode, and the light-emitting portion is isolated from a surrounding atmosphere. A connection terminal of a pair of base sheets, at least one of which is translucent, and an external driving circuit for applying a voltage to the electrodes, which is provided on the inner surface of the base sheet and which is in contact with the electrodes and does not contact each other. An EL element, characterized in that at least one having a light emitting element outside the region of the light emitting portion has a pair of translucent conductive layers.