JP2000223263A - Electroluminescence(el) - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the life of a luminescent part from being shortened due to the permeation of moisture from a bonding part of an upper glass substrate to a lower glass substrate, and prevent the damage of a pattern caught between the glass substrates from occurring. SOLUTION: A luminescent part 8 composed by laminating a transparent electrode 3, a luminescent layer 5, a dielectric layer 6 and a back electrode 4 is integrally formed on the inside surface of either one resin substrate (1 in Fig.) out of a pair of flat plate-like resin substrates 1, 2 oppositely arranged, resin sealing members 11 is caught between the resin substrate 1 having the formed luminescent part 8 and the opposite resin substrate 2, and the upper and lower resin substrates 1, 2 are welded to the resin sealing members 11 by means of an ultrasonic wave and sealed at welded parts 12. A through-hole 2a is formed in the lower resin substrate 2, and a conductive terminal 2C is installed in it. The lower resin substrate is molded into a box-like shape and welded to the upper resin substrate by means of an ultrasonic wave. Additionally, stepped parts are formed on the upper and lower resin substrates, which are welded to the resin sealing members at the stepped parts by means of an ultrasonic wave. Still additionally, the resin substrates and the resin sealing members are formed of a polycarbonate resin. A moisture permeation preventing effect is improved and EL can be realized at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to electroluminescence.

[0002]

2. Description of the Related Art In recent years, electroluminescence (hereinafter abbreviated as EL) has been used in electronic display devices such as portable watches and cellular phones for backlight illumination. In the EL used as the backlight, the EL is used to improve the moisture resistance and extend the life.
Some have a structure in which is sealed with glass.

As one of the structures sealed with glass,
There is one shown in FIG. FIG. 4 is a sectional view showing the structure of a conventional EL. In FIG. 4, the EL 9 is provided integrally with a light emitting portion 8 formed by sequentially laminating a transparent electrode 3, a light emitting layer 5, a dielectric layer 6, and a back electrode 4 on the lower surface side of the upper glass substrate 1. The upper glass substrate 1 and the lower glass substrate 2 are bonded and sealed with an insulating adhesive 7. Further, an extension 1a is provided on the upper glass substrate 1 in order to provide a conductive pattern for voltage application outside, and a conductive pattern 3a and a part of the back electrode 4 taken out from a part of the transparent electrode 3 on the lower surface of the extension 1a. Are formed by extending conductive patterns (not shown) taken out of the device and applying a voltage through the respective extended conductive patterns. In addition, a thermosetting insulating resin adhesive or the like is used for joining the upper glass substrate 1 and the lower glass substrate 2, and in particular, for joining at the conductive pattern portion, an adhesive layer is used to prevent the pattern from being damaged. Consideration such as thickening is required.

Here, the transparent electrode 3 is formed by depositing indium tin oxide (ITO) powder obtained by doping indium oxide with tin oxide on the lower surface of the upper glass substrate 1 by a vapor deposition method or the like. In addition, the light emitting layer 5 is formed by, for example, dispersing an activator such as zinc sulfide, copper or manganese, and an activator such as chlorine in a high dielectric resin binder such as a cyanoresin compound by a printing method or the like. . The dielectric layer 6 is made of, for example, a high dielectric substance such as barium titanate.
For example, it is formed by dispersing in a high dielectric resin binder such as a cyanoresin compound or the like by a printing method or the like. Also, the back electrode 4
Is formed by printing silver powder or graphite powder into a paste or the like.

There is also disclosed a structure in which the light emitting section 8 is covered with a moisture-proof film or the like and integrated with a glass substrate.

Further, a structure in which a moisture-proof oil such as silicon oil is sealed in a space between the upper and lower glass substrates 1 and 2 and the light-emitting portion 8 for the purpose of further improving the moisture-proof property is disclosed.

[0007]

However, the above-mentioned prior art has the following problems.
That is, as a means for sealing the upper and lower glass substrates, a thermosetting sealing method using a resin adhesive is employed. Therefore, heat adversely affects the EL inside the seal. At the same time, there is a fatal problem that moisture inevitably penetrates from the adhesive portion of the resin adhesive and shortens the light emission life of the light emitting portion.

Further, a structure in which silicon oil or the like is sealed has a problem that the life is slightly increased, but it cannot be said to be complete, and the cost is extremely increased.

In the conventional sealing structure, the conductive terminals extend to the outer edge of the glass substrate and are sealed. Therefore, since the extended pattern is sandwiched between the upper and lower glass substrates, it is caused by the thermosetting of the adhesive. The pattern is easily damaged due to stress distortion, warpage of the glass substrate, and the like. In order to prevent this, even a little adhesive layer is provided and sealed, so that the penetration of moisture increases. There is a problem that cutting the pattern significantly reduces the reliability of the EL.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to completely prevent the penetration of moisture, have excellent moisture resistance, drastically improve the luminous life, and furthermore, the pattern is free from breakage and reliable. It is intended to provide an EL having excellent properties at low cost.

[0011]

In order to achieve the above object, an EL according to the present invention comprises a light emitting layer and a dielectric layer interposed between two electrodes, a transparent electrode and a back electrode, and a voltage is applied to both electrodes. A light-emitting portion in which the light-emitting layer emits light by applying the light-emitting layer is integrally formed on the inner surface of any one of the pair of substrates disposed opposite to each other, and the formed light-emitting portion is sealed with the pair of substrates. In the electroluminescence encapsulated with the member, the pair of substrates is formed of a flat resin substrate, the sealing member is formed of a resin sealing member, and the pair of resin substrates and the resin sealing member are ultrasonically welded. It is characterized by being sealed.

In addition, a light emitting layer and a dielectric layer are sandwiched between two electrodes, a transparent electrode and a back electrode, and a light emitting portion in which the light emitting layer emits light when a voltage is applied to both electrodes is arranged to face each other. In electroluminescence in which the formed light emitting portion is integrally formed on the inner surface of any one of the pair of substrates and the formed light emitting portion is bonded and sealed to the pair of substrates, the pair of substrates is a flat resin substrate and a box. And two resin substrates are sealed by ultrasonic welding.

[0013] Further, a concave step portion is formed in the outer peripheral portions of the pair of flat upper and lower resin substrates facing each other, and a resin sealing member is ultrasonically welded and sealed at the step portion. Things.

Further, the resin substrate and the resin sealing member are both made of polycarbonate resin.

Further, a through-hole is provided in the substrate on which the light emitting portion is integrally formed, and a through-hole pattern is formed in the through-hole, and a conduction terminal for connecting to the through-hole pattern is provided. is there.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an EL according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of the EL according to the first embodiment of the present invention. In the drawings, the same members as those of the prior art are denoted by the same reference numerals.

In FIG. 1, an EL 10 has a light emitting section 8 formed by laminating a transparent electrode 3, a light emitting layer 5, a dielectric layer 6, and a back electrode 4 in the center of the lower surface of a flat upper resin substrate 1. It is provided integrally with the upper resin substrate 1. Then, the upper resin substrate 1 and the flat lower resin substrate 2 are formed around the outer resin substrate 1.
Sandwiches the resin sealing member 11 over the entire circumference, and ultrasonically welds the two resin substrates 1 and 2 and the resin sealing member 11 to the welding portion 1.
2 is used for sealing. The welding portion 12 can prevent moisture from entering.

Two small through holes 2a (2b are omitted in the figure) are formed in the lower resin substrate 2 at a position slightly away from the light emitting portion 8 formed in the upper resin substrate 1, and the transparent electrodes 3 are formed.
A through hole pattern 2A (2B is omitted in the figure) is formed. Further, patterns 3a and 6a extending from a part of the transparent electrode 3 and the back electrode 6 are formed, extend to the respective through holes 2a (2b), and are connected to and protrude from the through hole patterns 2A (2B). A conduction terminal 2C (2D is omitted in the figure) is formed. The conduction terminal 2C (2D) can be a terminal for applying voltage.

As described above, the conventional glass substrate is replaced with a resin substrate, and the resin substrate and the resin sealing member are sealed by ultrasonic welding, so that the sealing method is very simple. Can be manufactured at low cost.

FIG. 2 is a cross-sectional view of a main part showing the structure of an EL according to a second embodiment of the present invention. The above-described lower resin substrate is a box-shaped resin substrate, and the sealing member is omitted. As shown in FIG. 2, the flat upper resin substrate 1 and the box-shaped lower resin substrate 2 are ultrasonically welded. And welded part 1
2 sealed. As described above, the sealing member is not required, and the welding location is one. Further, the box-shaped lower resin substrate 2 can be easily formed.

FIG. 3 is a sectional view showing a main part of an EL structure according to a third embodiment of the present invention. The pair of flat upper and lower resin substrates 1 and 2 described in the first embodiment described above.
The stepped portions 13 having a concave shape are respectively formed on the outer peripheral portions facing each other, and the resin sealing member 11 is ultrasonically welded at the stepped portions 13 and sealed with the welded portions 12. By providing the stepped portion, even if moisture enters, if there is a stepped portion, once the stepped portion stops there, it is prevented from entering straight inside, and the effect of moisture prevention is produced.

Further, the use of a polycarbonate resin (for example, a polycarbonate material containing glass) for both the resin substrate and the resin sealing member can further improve the moisture permeation prevention effect.

[0023]

As described above, the cost can be reduced by using a flat resin substrate in place of the pair of glass substrates facing the EL and sealing it by ultrasonic welding.

In addition, by using a box-shaped resin substrate for the lower resin substrate, the sealing member can be eliminated and the cost can be reduced. In addition, by using only one welded portion, the location where moisture is permeated can be reduced, and moisture can be prevented. The effect is improved.

Further, by providing a step portion in the sealing portion, the invasion of moisture is prevented, and the effect of preventing moisture is improved.

Further, both the resin substrate and the resin sealing member can be replaced with polycarbonate resin to further improve the effect of preventing moisture penetration.

In addition, since the conductive terminal is taken out from the through-hole portion and the outer region of the EL is sealed, it is possible to provide an EL having excellent reliability without breakage of the pattern.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of an EL according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a structure of an EL according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part showing a structure of an EL according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a structure of a conventional EL.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper resin substrate 2 lower resin substrate 2a through hole 2A through hole pattern 2C conductive terminal 3 transparent electrode 4 back electrode 5 light emitting layer 6 dielectric layer 8 light emitting unit 10 EL 11 resin sealing member 12 welding portion 13 step portion

Claims (5)

[Claims] 1. A light-emitting layer and a dielectric layer are sandwiched between two electrodes, a transparent electrode and a back electrode, and light-emitting portions in which the light-emitting layer emits light by applying a voltage to both electrodes are arranged to face each other. In electroluminescence in which the formed light emitting portion is integrally formed on the inner surface of any one of the pair of substrates and the formed light emitting portion is sealed with the pair of substrates and a sealing member, the pair of substrates are formed of a flat resin. Electroluminescence, wherein the sealing member is made of a resin sealing member, and the pair of resin substrates and the resin sealing member are sealed by ultrasonic welding. 2. A light-emitting layer and a dielectric layer are interposed between two electrodes, a transparent electrode and a back electrode, and light-emitting portions, which emit light when the voltage is applied to both electrodes, are arranged opposite to each other. In electroluminescence in which the formed light emitting portion is integrally formed on the inner surface of any one of the pair of substrates and the formed light emitting portion is bonded and sealed to the pair of substrates, the pair of substrates is a flat resin substrate and a box. An electroluminescence device comprising: a resin substrate having a shape of a circle; and sealing the two resin substrates by ultrasonic welding. 3. A pair of flat upper and lower resin substrates, wherein a concave step portion is formed in the outer peripheral portions facing each other, and a resin sealing member is sealed by ultrasonic welding at the step portion. The electroluminescence according to claim 1. 4. The electroluminescence according to claim 1, wherein both the resin substrate and the resin sealing member are polycarbonate resins. 5. The semiconductor device according to claim 1, wherein a through-hole is provided in the substrate on which the light emitting portion is integrally formed, and a through-hole pattern is formed in the through-hole, and a conduction terminal connected to the through-hole pattern is provided. 5. The electroluminescence according to any one of 1 to 4.