JP3817103B2 - Manufacturing method of display panel device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a method of manufacturing a display panel equipment using an organic electroluminescence as a display device.
[0002]
[Prior art]
Organic EL (Electroluminecense) panels are used as various displays and light-emitting elements for information industry equipment. Especially, since they have excellent resistance to external mechanical vibrations and shocks, they are recently used in displays for car stereos and mobile phones. Attracted attention as a panel device.
[0003]
In order to protect the panel after forming the organic EL film, the organic EL panel needs to be covered on the back side of the glass substrate with a protective member made of an inorganic material such as glass or metal, or an organic material such as a film or acrylic. An adhesive is applied to bring the protective member into close contact with the glass substrate, and at the same time, entry of substances that degrade the organic EL, such as oxygen and moisture, is prevented from the outside.
[0004]
FIG. 4 shows a conventional method for bonding a protective component and a glass substrate. (A) and (b) show the cross-sectional structure and the planar structure of the display panel device before bonding and (b) and (c), respectively, after bonding.
In FIG. 4, the application of the adhesive 2 is performed by a dispenser or a printing method, and sealing is performed by making portions A, B, C, and D where no adhesive is applied in the entire circumference application. The internal pressure was released.
[0005]
[Problems to be solved by the invention]
By the way, according to the conventional bonding method shown in FIG. 4, there is a possibility that the pressure inside the seal is the same as the outside, or may be lowered due to temperature change, etc. It becomes the situation that becomes easy to invade. In addition, a process such as partly cutting the adhesive is required, the adhesive application accuracy is deteriorated, and the dead space of the display panel is increased.
[0006]
The present invention has been made in view of the above circumstances, an organic EL layer is formed on a substrate, an adhesive is applied so as to surround the organic EL layer, a protective member is placed in this state, and By pressing this protective member and crushing the adhesive, the pressure in the internal space of the substrate sealed by the protective member is set to be larger than the pressure in the external space of the display panel device including the substrate. in, and to provide a manufacturing method of a display panel equipment capable of preventing the entry of harmful substances for organic EL externally.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problem, a method for manufacturing a display panel device according to claim 1 includes a substrate, a display element mounted on the substrate, and a surface on the substrate opposite to the display surface of the display element. A method of manufacturing a display panel device comprising a protective member that seals the display element attached to the side and protects the display element, the step of forming the display element on the substrate, A step of adhering an adhesive at a predetermined height so as to surround the display element, a step of bonding the protective member on the substrate so that the adhesive contacts, and a pressurized state isolated from the outside at the container, the protective member is pressed to the substrate side as the adhesive is deformed, the pressure in the inner space of the substrate is larger than the pressure in the external space of the display panel device including the substrate Process and the group The pressure of the internal space in large state of, and curing the adhesive, and it was a step of sealing by the protective member said display elements are contacted by the protective member and the substrate.
[0011]
According to a second aspect of the present invention, in the method for manufacturing the display panel device according to the first aspect, the internal pressure is +0.01 compared to the pressure in the external space of the display panel device including the substrate. It was decided to be in the range of ˜ + 10 atm. Furthermore, the manufacturing method of the display panel according to claim 3 is the same method according to claim 1 or 2, wherein the adhesive is a UV curable epoxy resin before the pressing. The predetermined height is set to a range of 100 to 200 μm, and the predetermined height after the pressing is set to 1 to 20 μm. The method for manufacturing a display panel according to claim 4 encloses a substrate, a display element mounted on the substrate, and the display element mounted on the surface opposite to the display surface of the display element. A method of manufacturing a display panel device comprising a protective member that stops and protects the display element, the step of forming the display element on the substrate, and UV curing so as to surround the display element on the substrate A step of attaching an adhesive at a height in the range of 100 to 200 μm, a step of bonding the protective member on the substrate so that the UV curable adhesive is in contact, and the UV curable adhesive comprising the protective member. The substrate is pressed so as to be deformed, the UV curable adhesive is set to a height in the range of 1 to 20 μm, and the pressure in the internal space of the substrate is compared with the pressure in the external space of the display panel device including the substrate. Big And the step of sealing the display element with the protective member by curing the UV adhesive and bringing the protective member and the substrate into close contact with each other in a state where the pressure in the internal space of the substrate is increased. It was equipped with.
[0012]
Manufacturing method of a display panel device according to claim 5, in the method according to any one of claims 1 to 4, it was decided the display element is an organic EL element. Moreover, the manufacturing method of the display panel of Claim 6 is the same method of any one of Claims 1 thru | or 5 , The said board | substrate is a transparent glass substrate, The light generated from the said display element is the said. The output was made through a transparent glass substrate.
[0013]
Thus, the adhesive is applied to the entire circumference of the panel sealing portion by adhering the adhesive at a predetermined height so as to surround the display element on the substrate on which the display element is formed. And the substrate are bonded together, and the volume is changed by pressing the adhesive. The pressure change by blastema product was a closed space changes, and cure the adhesive in this state, the high pressure than the pressure of the sealed-inside to the outside by adhering the protective member and the substrate Can be maintained. Accordingly, it is possible to prevent the entry of harmful components such as moisture and oxygen from the outside into the organic EL. In addition, an extra step such as cutting a part of the adhesive is applied to the entire circumference, so that it is unnecessary.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a basic structure of a display panel device according to a manufacturing method of the present invention, and a cross section and a plane are shown by (a) and (b), respectively.
As shown in FIG. 1, the display panel device of the present invention includes a glass substrate 1, an organic EL element 10 formed on the glass substrate 1, and a display surface of the organic EL element 10 on the glass substrate 1. The protective member 3 is attached to the surface side and seals and protects the organic EL element 10. Characteristically, the pressure in the internal space of the glass substrate 1 sealed by the protective member 3 is set to be larger than the pressure in the external space of the display panel device including the glass substrate 1. Details will be described later.
[0015]
FIG. 2 is a process diagram showing a method for manufacturing a display panel according to the present invention. Each process is listed as (a) to (d). In the display panel device shown in FIG. 1, first, an organic EL element 10 is formed on a glass substrate 1 (step a). Next, the adhesive 2 is deposited so as to be deposited at a predetermined height so as to surround the organic EL element 10 formed on the glass substrate 1 (step b). And the protection member 3 is bonded together on the glass substrate 1 so that the adhesive agent 2 may contact in this state (process c).
Next, the protective member 3 is pressed toward the glass substrate 1 so that the adhesive 2 is deformed, and the pressure in the internal space of the glass substrate 1 is larger than the pressure in the external space of the display panel device including the glass substrate 1. Then, the organic EL element 10 is sealed with the protective member 3 (step d).
[0016]
FIG. 3 is a diagram showing details of the bonding process between the glass substrate 1 and the protective member 2 shown in FIG. 2, wherein (a) and (b) are before bonding, and (b) and (c) are bonding. A cross-sectional structure and a planar structure of the display panel device will be shown later.
In the embodiment of the present invention, a UV curable epoxy resin having a high viscosity and thixotropy is used as the adhesive 2, and a shape in which the adhesive 2 is applied to the entire periphery of the panel sealing portion by a dispenser or printing is possible. Try to keep as long as possible. In this state, the protection member 3 is placed, and the protection member 3 and the glass substrate 1 are bonded together.
[0017]
Here, a volume change occurs by crushing the bonded portion (shaded portion in the figure). That is, because the volume is closed, the pressure increases if the volume decreases. In this state, the adhesive 2 is cured and the protective member 3 and the glass substrate 1 are brought into close contact with each other, so that the pressure inside the seal can be kept higher than the outside (positive pressure). Since the pressure inside the seal is positive, it is difficult for harmful substances such as moisture and oxygen to enter the organic EL from the outside, and the adhesive is applied all around and partially cut off. This eliminates the need for protrusions, and also provides a derivative effect that the application accuracy is improved and the display panel is narrowed.
[0018]
The numerical range of the internal pressure is +0.01 to +10 atm when the outside is 1 atm. Moreover, the pressure assumed when sealing with flat glass is + 0.05- + 8.3 atmospheres, In this embodiment, it was set to + 0.1- + 0.2 atmospheres. However, the size of the protection member 3 is 101 mm × 24 mm for the car stereo type, and 36.6 mm × 22.4 mm for the mobile phone type. In addition, the height of the adhesive 2 before pressing the protective member 3 is about 100 μm, and the height of the adhesive 2 after pressing is 1 to 20 μm. In the embodiment of the present invention, the thickness is 12 μm.
[0019]
As described above, in the present invention, the organic EL layer 10 is formed on the glass substrate 1, the adhesive 2 is applied so as to surround the organic EL element 10, and the protective member 3 is placed in this state. Then, the pressure of the internal space of the glass substrate 1 sealed by the protective member 3 is compared with the pressure of the external space of the display panel device including the glass substrate 1 by pressing the protective member 3 and crushing the adhesive 2. In order to prevent the entry of substances harmful to the organic EL from the outside, the application accuracy of the adhesive 2 is further improved.
[0020]
In addition, when sealing is performed in the above-described embodiment of the present invention, it is performed in a container isolated from the outside, and the container is kept at the same or slightly higher pressure than the pressure in the seal before the adhesive is cured in the container. The internal pressure should be adjusted. By adjusting in such a manner, the yield of the sealing process is improved.
[0021]
【The invention's effect】
As described above, according to the present invention, the adhesive is applied to the entire periphery of the panel sealing portion by adhering the adhesive at a predetermined height so as to surround the display element on the substrate on which the display element is formed. Then, the protective member and the substrate are bonded together in that state, and the pressure change caused by the volume change by pressing the adhesive is utilized, and the adhesive is cured in that state to bring the protective member and the substrate into close contact with each other. Thus, the pressure inside the seal can be maintained at a higher pressure than the outside. This can prevent the entry of harmful components such as moisture and oxygen into the organic EL from the outside. In addition, since the adhesive is applied to the entire circumference, it is possible to eliminate the need for extra steps such as cutting a part, and it is possible to improve the application accuracy such as protrusion, and the display panel is narrowed. Derivative effects can also be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a cross-sectional structure of a display panel device of the present invention.
FIG. 2 is a process diagram showing a method for manufacturing a display panel according to the present invention.
FIG. 3 is a diagram showing details of a bonding process in FIG. 2;
FIG. 4 is a diagram cited for explaining a conventional bonding process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Adhesive 3 Protection member 10 Organic EL element

Claims (6)

A substrate, a display element mounted on the substrate, and a protective member that protects the display element by sealing the display element that is mounted on the substrate and opposite to the display surface of the display element. A method for manufacturing a display panel device, comprising:
Forming the display element on the substrate;
Attaching an adhesive at a predetermined height so as to surround the display element on the substrate;
Bonding the protective member on the substrate so that the adhesive contacts,
In a pressurized container isolated from the outside, the protective member is pressed against the substrate so that the adhesive is deformed, and the pressure in the internal space of the substrate is outside the display panel device including the substrate. A process for increasing the pressure in space ,
The step of sealing the display element with the protective member by curing the adhesive and bringing the protective member and the substrate into close contact with each other in a state where the pressure of the internal space of the substrate is increased .
A method for manufacturing a display panel device, comprising: 2. The method of manufacturing a display panel device according to claim 1, wherein the internal pressure is in a range of +0.01 to +10 atm as compared with a pressure in an external space of the display panel device including the substrate . When the adhesive used is a UV curable epoxy resin, the adhesive has a predetermined height before pressing in the range of 100 to 200 μm, and the predetermined height after pressing is set to 1 to 20 μm, The manufacturing method of the display panel apparatus of Claim 1 or 2 . A substrate, a display element mounted on the substrate, and a protective member that protects the display element by sealing the display element that is mounted on the substrate and opposite to the display surface of the display element. A method for manufacturing a display panel device, comprising:
Forming the display element on the substrate;
Attaching a UV curable adhesive at a height in the range of 100 to 200 μm so as to surround the display element on the substrate;
Bonding the protective member onto the substrate so that the UV curable adhesive is in contact;
The protective member is pressed against the substrate side so that the UV curable adhesive is deformed, the UV curable adhesive is set to a height in the range of 1 to 20 μm, and the pressure in the internal space of the substrate includes the substrate. A process for increasing the pressure in the external space of the device ;
The step of sealing the display element with the protective member by curing the UV adhesive in a state where the pressure of the internal space of the substrate is increased, and bringing the protective member and the substrate into close contact with each other ;
A method for manufacturing a display panel device, comprising: The display device manufacturing method of the display panel device according to any one of claims 1 to 4, characterized in that an organic EL element. The substrate is a transparent glass substrate, a manufacturing method of a display panel device according to any one of claims 1 to 5 light generated from the display device is characterized in that it is output through the transparent glass substrate.

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