JPH0945480A - EL display panel - Google Patents

Abstract

(57) [PROBLEMS] To provide an EL display panel which can be easily cut by a user and has a simple structure at low cost. A transparent substrate 1 having a transparent electrode layer 2 on its back surface.
In an EL display panel in which a light emitting layer 3, an insulating layer 4, and a back electrode layer 5 are sequentially stacked, a transparent electrode voltage drop prevention band 6 is provided on the back surface of the transparent electrode exposed portion 2a exposed at the outer peripheral portion. A back electrode voltage drop prevention band 7 having a long groove 8 is formed in each of them. The transparent electrode voltage drop prevention band 6 has a plurality of recesses 6a, which serve as cutting guides, on the outer peripheral edge thereof.
Are formed at equal intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL display panel, and more particularly to a thin and large format EL display panel used for advertisement display (POP) and the like.

[0002]

2. Description of the Related Art Conventionally, a thin EL display panel that can be cut with scissors or the like is not only cut according to the external specifications at the time of its manufacture, but also when it is used for advertisement display (POP) and the like. Is cut to a desired size.

FIGS. 5 and 6 show conventional EL display panels 100 and 110 used in the above method. The same members in the EL display panels 100 and 110 are designated by the same reference numerals. EL display panel 100, 1
10 is an EL display panel formed by sequentially laminating a transparent base material 101 having a transparent electrode layer 102 on the back surface, a light emitting layer 103, an insulating layer 104, and a back electrode layer 105, and is shown in the drawing at the time of manufacturing. It is cut out in such an outer shape. A voltage drop prevention band 106 is formed on the back electrode layer 105. Further, in the EL display panel 110 of FIG. 6, a long groove 107 is formed in the voltage drop prevention band 106.

When the EL display panels 100 and 110 are used, strip-shaped cutting is performed at regular intervals, and strip-shaped cutting such as half-cutting or four-cutting is performed.

[0005]

However, in the above-mentioned conventional EL display panel, a mark (dot or line) serving as a guide for cutting out to the specified contour at the time of manufacturing is printed in the margin of the transparent substrate. After cutting into the outer shape as shown in FIG. 5 and FIG. 6, since the mark does not remain, there is no standard for cutting by the user, and it is inconvenient to cut into a predetermined shape and size. Further, in the EL display panel 110 of FIG.
It is possible to cut into half-cuts or four-cuts along the long groove 107, but it is difficult to accurately cut into other dimensions, in particular, a strip having a small area.

Further, it is possible to print a mark serving as a guide for cutting at the time of use on the front surface or the back surface of the EL display panel, but there is a problem that the cost for printing increases due to an increase in plate cost for the printing. is there.

Therefore, an object of the present invention is to provide an EL display panel which can be easily cut by a user and which has a simple structure at low cost.

[0008]

In order to achieve the above object, a first feature of the present invention comprises a transparent base material having a transparent electrode layer on the back surface, a light emitting layer, an insulating layer and a back electrode layer. An EL display panel in which these are sequentially laminated is formed, and a transparent electrode exposed portion is formed on the transparent electrode layer by exposing the outer peripheral portion of the transparent electrode layer from other layers. A transparent electrode voltage drop prevention zone is formed on the exposed portion of the transparent electrode. A plurality of recesses are formed at predetermined intervals on the peripheral edge of the transparent electrode voltage drop prevention band.

The second characteristic is that in addition to the above-mentioned first characteristic,
A back electrode voltage drop prevention band is formed on the back electrode layer.
A long groove is formed inside the back electrode voltage drop prevention band, and the inside of this long groove is formed in the back electrode exposed portion. A plurality of recesses are formed at predetermined intervals on the inner circumference of the long groove.

A third feature is an EL display panel including a transparent base material having a transparent electrode layer on the back surface, a light emitting layer, an insulating layer, and a back electrode layer, which are sequentially laminated. A back electrode voltage drop prevention band is formed on the layer. And, in the outer peripheral edge of the back electrode voltage drop prevention band,
The plurality of recesses are formed at predetermined intervals.
The fourth feature is that, in addition to the above-mentioned third feature, a long groove is formed inside the back electrode voltage drop prevention zone, and the inside of this long groove is formed in the back electrode exposed portion. A plurality of recesses are formed at predetermined intervals on the inner circumference of the long groove.

[0011]

1 and 2 show a first embodiment of an EL display panel of the present invention. This EL display panel is a non-sealed type without a sealing film, and is a thin and large-sized flexible EL display panel.

In this EL display panel, a transparent electrode layer 2 is formed on the back surface of a transparent substrate 1 made of a synthetic resin film such as polyethylene terephthalate (PET) by a method such as vapor deposition of ITO. The light emitting layer 3, the insulating layer 4, and the back electrode layer 5 are sequentially formed on the top by screen printing or the like.

For the light-emitting layer 3, an ink is used in which a light-emitting body obtained by doping copper into zinc sulfide, which is a fluorescent substance, and a fluororesin binder are mixed and stirred. The insulating layer 4 uses an ink in which barium titanate, which is a high dielectric material, and a fluorine binder are mixed and stirred. The back electrode layer 5 is made of carbon paste.

As shown in FIG. 2, in the outer peripheral portion of the EL display panel, the outer peripheral portion of the transparent electrode layer 2 is exposed from other layers, and a transparent electrode exposed portion 2a is formed. That is, the transparent electrode layer 2 is printed so that a predetermined amount (area) is exposed from a part or the entire circumference of the light emitting layer 3 and the insulating layer 4.

The transparent electrode exposed portion 2a and the back electrode layer 5 are also provided.
The back electrode layer 5 is formed such that the end portion thereof is located inward of the end portion of the insulating layer 4 so that the insulating layer 4 is interposed between the back electrode layer 5 and the insulating layer 4.

As shown in this embodiment, a transparent electrode lead-out portion 2b made of carbon paste is formed on the transparent electrode exposed portion 2a to ensure the reliability of connection.
The transparent electrode lead-out portion 2b also secures a sufficient distance for insulation with the back electrode layer 5. A transparent electrode voltage drop prevention band 6 made of silver paste or the like is formed on the transparent electrode exposed portion 2a via a transparent electrode extraction portion 2b. The transparent electrode voltage drop prevention band 6 is for increasing conductivity,
It is formed in a strip shape along the outer periphery of the transparent electrode layer 2.

On the back electrode layer 5, a back electrode voltage drop prevention band 7 made of silver paste or the like for enhancing conductivity is formed similarly to the transparent electrode voltage drop prevention band 6. The back electrode voltage drop prevention band 7 is formed in a strip shape on the outer peripheral portion of the back electrode layer 5, and is formed integrally with this in a cross shape (lattice shape) inside the back electrode layer 5 in FIG. 1. . Thereby, in the back electrode layer 5 made of carbon, it is possible to prevent the voltage from dropping as the distance from the voltage applying portion increases. The number and size of the grids of the back electrode voltage drop prevention band 7 can be increased or decreased according to the size of the area of the light emitting portion of the EL display panel.

Further, a long groove 8 is formed along the longitudinal direction inside the cross-shaped portion of the back electrode voltage drop prevention band 7 formed inside the back electrode layer 5, and the inside of the back electrode is exposed. It is a part 5a. As a result, the user of this EL display panel can cut along the long groove 8 when cutting the EL display panel into half cut, four cut, or eight cut, and the individual EL display after cutting can be cut. Since the voltage drop prevention zone is formed on the outer peripheral portion of the panel, uneven light emission does not occur.

A plurality of recesses 6a are formed on the outer peripheral edge of the transparent electrode voltage drop prevention band 6. This recess 6a
Is a reference (scale) when the user cuts the EL display panel. In FIG. 1, the recesses 6a provided on the left and right outer edges of the transparent electrode voltage drop prevention band 6 are
The cutting lines when cut in accordance with this are formed at the same position in the vertical direction so that they become horizontal lines, and the recesses 6a provided at the upper and lower outer edge portions are the cutting lines when cut in accordance with this. Are formed at the same position in the lateral direction so that the line becomes a vertical line. The interval between the recesses 6a ... Can be set arbitrarily. Further, the shape of the concave portion 6a is not limited, and may be formed in a V shape or the like other than the rectangular shape shown in the drawing. Further, if the shape or size of the recessed portions 6a is formed so as to be different for each predetermined number, it becomes easier to count as a scale, which is more convenient. Furthermore, a recess similar to the above may be provided on the inner peripheral edge of the transparent electrode voltage drop prevention band 6.

The recess 6a is formed simultaneously with the printing of the transparent electrode voltage drop prevention band 6 in the manufacturing process of the EL display panel.

Next, the method of using the EL display panel will be described. The user of the EL display panel can cut the recess 6a into a desired shape and size by using, for example, a ruler and a cutter as a cutting guide. In that case,
Not only can the EL display panel be cut in half, four, or eight, but it can also be cut into smaller strips. It is also easy to cut diagonally, and it is possible to cut into various shapes and sizes.

FIG. 3 shows an EL display panel according to another embodiment. In this EL display panel, the outer peripheral edge of the back electrode voltage drop prevention band 7 on the back electrode layer 5 is
A plurality of concave portions 7a ... Are formed at equal intervals. Since other configurations are similar to those of the above-described embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. The recess 7a can be formed on the inner peripheral edge of the back electrode voltage drop prevention band 7, but it is preferable to form the recess 7a on the outer peripheral edge as described above because a wider range can be covered. The recess 7a is formed simultaneously with the printing of the back electrode voltage drop prevention band 7 in the manufacturing process of the EL display panel.

FIG. 4 shows still another embodiment. In this EL display panel, a plurality of recesses 7a are formed in the outer peripheral edge of the back electrode voltage drop prevention band 7 on the back electrode layer 5.
Are formed at equal intervals, and a plurality of recesses 8a are formed at predetermined intervals on the inner peripheral portion of the long groove 8. By doing so, there is an advantage that the recess 7a or the recess 8a remains on each side of each cut panel even after the EL display panel is cut into half, four, and eight. Therefore, it becomes easier to cut it into a desired size. Since other configurations are similar to those of the above-described embodiment shown in FIGS. 1 and 2, the same components are designated by the same reference numerals and the description thereof will be omitted.

Although not shown, a plurality of recesses 6a are formed in the outer peripheral edge of the transparent electrode voltage drop prevention band 6 as in the embodiment shown in FIG. 2, and the rear electrode voltage drop is performed as shown in FIG. A plurality of concave portions 8a are formed on the inner peripheral portion of the long groove 8 of the prevention band 7.
May be formed. In this case, there are the same advantages as the embodiment of FIG.

[0025]

As described above, according to the EL display panel of the present invention, the scale serving as a cutting guide is provided at the peripheral edge of the transparent electrode voltage drop prevention band or the outer peripheral edge of the back electrode voltage drop prevention band. By forming the concave portions that serve a role at predetermined intervals, cutting is easy and time-consuming during use, and the printing process does not increase during manufacturing, so that the structure is low-cost and simple.

In addition, since the concave portion is formed in the inner peripheral portion of the long groove formed inside the back electrode voltage drop prevention zone, it is more convenient for cutting.

[Brief description of drawings]

FIG. 1 is a rear view of an EL display panel of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a rear view of an EL display panel according to another embodiment of the present invention.

FIG. 4 is a rear view of an EL display panel according to another embodiment of the present invention.

FIG. 5 is a rear view of an EL display panel which is a conventional example.

FIG. 6 is a rear view of an EL display panel which is another conventional example.

[Explanation of symbols]

 1 Transparent Substrate 2 Transparent Electrode Layer 2a Transparent Electrode Exposed Area 3 Light Emitting Layer 4 Insulating Layer 5 Back Electrode Layer 5a Back Electrode Exposed Area 6 Transparent Electrode Voltage Drop Prevention Zone 7 Back Electrode Voltage Drop Prevention Zone 8 Long Grooves 6a, 7a, 8a Recess

Claims (4)

[Claims] 1. An EL display panel comprising a transparent base material having a transparent electrode layer on the back surface, a light emitting layer, an insulating layer, and a back electrode layer, which are sequentially laminated, wherein the transparent electrode layer comprises: A transparent electrode exposed portion is formed by exposing the outer peripheral portion from another layer, and a transparent electrode voltage drop prevention band is formed on the transparent electrode exposed portion, and a peripheral portion of the transparent electrode voltage drop prevention band is formed. In the EL display panel, a plurality of concave portions are formed at predetermined intervals. 2. The back electrode layer according to claim 1, wherein a back electrode voltage drop prevention band is formed on the back electrode layer, and a long groove is formed inside the back electrode voltage drop prevention band. An EL display panel, characterized in that it is formed in an electrode exposed portion, and a plurality of concave portions are formed at predetermined intervals on an inner peripheral portion of the long groove. 3. An EL display panel comprising a transparent base material having a transparent electrode layer on the back surface, a light emitting layer, an insulating layer and a back electrode layer, which are sequentially laminated, wherein the back electrode layer has a back surface. An EL display panel, wherein an electrode voltage drop prevention band is formed, and a plurality of recesses are formed at predetermined intervals on the outer peripheral edge of the back electrode voltage drop prevention band. 4. The long groove is formed inside the back electrode voltage drop prevention band according to claim 3, the inside of the long groove is formed at a back electrode exposed portion, and an inner peripheral portion of the long groove is formed.
An EL display panel, characterized in that a plurality of recesses are formed at predetermined intervals.