KR20060032037A - Encapsulation cap - Google Patents

Abstract

The present invention discloses a sealing cap having a structure capable of performing a moisture absorption function on the components of the elements by using only one getter (hygroscopic agent) while simultaneously sealing two elements. In the device sealing cap according to the present invention, recesses having a predetermined depth and width are respectively formed on the first surface and the second surface opposite to the first surface, and the members are formed with cutouts for communicating each recess with each other. A getter (hygroscopic agent) is attached to the edge of the cutout of the bottom of any one recess. Therefore, the components of each element attached to the outer portion by sealant on the outer portion of each recess are located and sealed in each recess, and the moisture present in both recesses is absorbed by a single getter attached to the bottom of either recess. do.

Organic electroluminescent element, sealing cap

Description

Sealing cap {Encapsulation cap}

1 is a cross-sectional view of a general organic electroluminescent device.

2 is a schematic side view of a mobile phone.

3 is a cross-sectional view showing a relationship between two organic electroluminescent elements and a sealing cap according to the present invention.

The present invention relates to a sealing cap, and in particular, a structure capable of attaching display elements on both sides can minimize the thickness of the entire device on which the device is mounted, and uses only a single getter (absorbent) for both devices. A sealing cap capable of performing a hygroscopic action.

In organic electroluminescence, electrons and holes injected through a cathode and an anode are recombined to form an exciton in an organic (low molecular or polymer) thin film, and light of a specific wavelength is generated by energy from the excitons formed. This is a phenomenon that occurs.

The organic EL device using this phenomenon has a basic structure as shown in FIG. 1. The organic electroluminescent element is basically an indium tin oxide layer 2 formed on the glass substrate 1 and the glass substrate 1 and used as an anode electrode, hereinafter referred to as an "ITO layer". ), An insulating layer, an organic material layer 3 and a metal electrode layer 4 which is a cathode electrode are laminated. Reference numeral “W” denotes a partition wall for separating the organic material layer 3 and the cathode electrode layer 4 into a plurality of zones.

On the other hand, the elements constituting the organic material layer 3 is a general matter in the technical field of the organic electroluminescent device, and thus a detailed description thereof will be omitted.

The organic material layer 3, which is one of the elements constituting the organic EL device having such a structure, has a property of being vulnerable to moisture and heat. Thus, in order to isolate the organic layer 3 from the outside (atmosphere) (i.e., to prevent moisture penetration), the metal cap 10 is fixed to the edge of the ITO layer 2 to seal its inner space, that is, each component of the device. Let's do it. The structure and bonding process of the metal cap 10 having this function will be briefly described.

In general, the metal cap is formed inside the junction 11, the junction 11 attached to the surface of the ITO layer 2 to accommodate the cathode electrode layer 4, the organic layer 3, and the partition wall W described above. It is divided into a second space portion 13 formed inside the first space portion 12 and the first space portion 12 and to which a getter 6, which is a moisture absorbent, is attached to the bottom through a tape 5.

After forming the above-described elements on the glass substrate 1, a sealant (S; sealant) on the bottom surface of the junction surface 11 of the metal cap 10 in order to attach the metal cap 10 to the surface of the ITO layer 2; After dispensing), the metal cap 10 is pressed against the surface of the ITO layer 2. Therefore, each component of the organic EL device is completely isolated from the outside by the cap 10.

Meanwhile, as shown in FIG. 2, the mobile phone H widely used as a communication means includes a sub window (SW) in front of the display unit D and a main window (MW) in the rear thereof. Each of these is composed separately. In mobile phones in use today, the main window (MW) is composed of a liquid crystal display (LCD) element, and the sub window (SW) is composed of an organic electroluminescent device (OLED), respectively, and the main window (MW) and a sub window (SW). ) Is designed to be driven and controlled independently by each associated circuit (chip).

In a situation where the size of a mobile phone is gradually miniaturized and the image sharpness is greatly improved, both the sub window SW and the main window MW are composed of organic electroluminescent elements, and a single chip is used to Technological development is being carried out to drive and control all of the main windows (MW).

One of the considerations when configuring the sub window SW and the main window MW is to isolate the organic material layer, which is one of the elements constituting the organic EL device, from the outside (atmosphere) as described above. It is the structure of the cap used.

When the sub-window SW and the main window MW are each composed of an organic electroluminescent device, an organic material layer is disposed in the organic electroluminescent device constituting the sub-window SW and the organic electroluminescent device constituting the main window MW. Caps are to be fitted to protect the structures involved. However, the cap (shown in FIG. 1) mounted on each device acts as a factor of increasing the specification (thickness) of the device, and in particular, the two caps mounted on each device result in the final product to which the device is applied, namely The standard (thickness) of the mobile phone is bound to increase.

 SUMMARY OF THE INVENTION An object of the present invention is to provide a cap capable of simultaneously sealing two elements when two display elements are disposed on both sides of the same member, such as a sub window and a main window configured on both sides of a display portion of a mobile phone. .

Another object of the present invention is to provide a sealing cap having a structure capable of performing a moisture absorption function on the components of the elements by using only one getter (hygroscopic agent) while simultaneously sealing two elements.

In the device sealing cap according to the present invention to achieve the above object is provided with recesses of a predetermined depth and width on the first surface of the member and the second surface opposite to the first surface, respectively, the members communicate with each other. A cutout is formed, and a getter (hygroscopic agent) is attached to the cutout edge of the bottom surface of any one recess. Accordingly, the components of each element having the outer portion attached to the outer portion of each recess by sealant are placed and sealed in each recess, and moisture present in both recesses is absorbed by one getter.

Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.

3 is a cross-sectional view illustrating a relationship between two organic electroluminescent devices and a sealing cap according to the present invention. A first feature of the sealing cap according to the present invention is the first organic electroluminescent element P1 (hereinafter referred to as < RTI ID = 0.0 > 1) < / RTI > And a second organic electroluminescent element (hereinafter referred to as "second panel") are hermetically attached to each other. On the other hand, for convenience, each element illustrated in FIG. 3 does not show all the components shown in FIG. 1.

The first surface 31 and the second surface 32 of the flat cap 30 are formed with recesses 31A and 32A each having a predetermined depth and width, and the first recess 31A and the second recess 32A. The through cutout GH of a predetermined area is formed in the predetermined area | region of the member which distinguishes the recessed part 32A. Therefore, the 1st recessed part 31A and the 2nd recessed part 32A maintain the state which communicated with each other through this incision part GH.

On the other hand, the getter G which is a moisture absorber is attached to the bottom surface of any one of 31 A of 1st recessed parts and 32 A of 2nd recessed parts (1st recessed part 31A in FIG. 3). That is, the bottom outer edge of the getter G is attached on the outer surface of the cutout GH existing at the bottom of the first recess 31A. Therefore, the first surface of the getter G is exposed to the space of the first recess 31A, and the second surface opposite to the first surface is exposed to the space of the second recess 32A through the incision GH. It is in a state.

The sealant S is applied to the outer portions 31B and 32B of the first surface 31 and the second surface 32 of the cap 30, that is, the outer portions of the respective recesses 31A and 32A. (P1) and the second panel P2 are bonded and fixed to the outer surfaces 31B and 32B of the first surface 31 and the second surface 32 of the cap 30 via the sealant S, respectively. .

Element components (not shown) formed on one surface of the first and second panels P1 and P2 are recessed portions 31A and 32A formed on the first and second surfaces 31 and 32 of the cap 30. Since it corresponds to each, the contact with the cap 30 is not made. In addition, the first and second panels P1 and P2 have components formed on one surface thereof, respectively, on recesses 31A and 32A formed on the first surface 31 and the second surface 32 of the cap 30, respectively. Correspondingly, light generated in each of the panels P1 and P2 can be observed from the outside.

Here, the moisture present in the first recess 31A in which the element components of the first panel P1 are accommodated is absorbed by the getter G exposed to the first recess 31A. In addition, the moisture present in the second recess 32A in which the element components of the second panel P2 are accommodated is getter G attached to the bottom surface of the first recess 31A through the cutout GH. Is absorbed into.

On the other hand, Figure 3 shows that the getter (G) attached to the bottom surface of any one of the recesses in this case, but in this case the center portion of the getter (G) corresponds to the incision (GH) there is no supported portion . Therefore, the central portion of the getter G may be deformed due to sagging or the like, and the deformation of the getter G may cause contact between the getter G and the components of the device. In the present invention, the getter G is formed by forming a cutout portion (not shown in the drawing) having a larger area than that of the cutout portion GH formed in the central portion of the getter G. The deflection phenomenon can be prevented.

As described above, the sealing cap according to the present invention may completely separate the components of the two elements from the outside by a single cap by attaching two display elements, respectively, by forming recesses on both sides of a single member cap. .

In addition, by attaching the getter only to the bottom surface of any one of the parts to perform the dehumidification function of the components of both devices can be obtained the effect of the getter attachment process and the reduction of the getter material.

In addition, as shown in FIG. 3, by attaching the getter only to the bottom surface of one recess, the depth t of the other recess where the getter is not attached is reduced to a minimum enough to accommodate the height of the element formed in the panel. It can also be set to reduce the height of the final device.

The present invention described above has been disclosed for the purpose of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Accordingly, such modifications, changes and additions should be considered to be within the scope of the following claims.

Claims (3)

In the cap attached to the outer periphery of the substrate constituting the display device to isolate each component of the device from the outside, Recesses of a predetermined depth and width are respectively formed on the first face of the member and on the second face opposite to the first face, and the member is formed with an incision that communicates the recesses with each other at a predetermined position. Cap for element sealing with a getter (hygroscopic) attached to the edge of the cutout. The element sealing cap according to claim 1, wherein a cutout of a predetermined area is formed in a central portion of the getter. 3. The device sealing cap according to claim 2, wherein the cutout formed in the getter has a larger area than the area of the cutout formed in the bottom of the recess.

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