KR20060068687A - Organic electro luminescence display device - Google Patents

Abstract

The present invention relates to an organic electroluminescent display device that can reduce the damage to the device to the external shock while thinning the mobile phone.

In the organic electroluminescent display device according to the present invention, a first concave region is provided on a first surface, and a second concave region having a smaller size than the first concave region is provided on a second surface opposite to the first surface. A glass cap; A first substrate formed with a first organic electroluminescent array packaged by the first concave region; And a second substrate on which a second organic light emitting array packaged by the second concave region is formed, wherein the areas of the first and second substrates are the same.

Description

Organic Electroluminescent Display Device             

1 is a view schematically showing a conventional organic electroluminescent display device.

2 is a diagram illustrating a light emission principle of a conventional organic electroluminescent display device.

3 is a schematic view of an organic electroluminescent display device having two organic electroluminescent arrays sharing one glass cap according to an embodiment of the present invention.

4 is a view showing an organic light emitting display device used in a communication means according to an embodiment of the present invention.

    <Explanation of symbols for the main parts of the drawings>

2: substrate 102: first substrate

4: anode electrode 8: partition wall

10 organic light emitting layer 12 cathode electrode

28,128: Glass cap 25,125: Sealant

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display device, and more particularly, to an organic electroluminescent display device capable of miniaturizing a mobile phone and minimizing damage to the device against external shock.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, and an electroluminescence display device. And the like). In particular, the EL display device is basically formed by attaching electrodes to both sides of an organic light emitting layer including a hole transporting layer, a light emitting layer, and an electron transporting layer.

Such EL display elements are largely divided into inorganic EL display elements and organic EL display elements depending on the materials used. Among them, the organic EL display device can be driven at a lower voltage than the inorganic EL display device because when the charge is injected into the organic EL layer formed between the hole injection electrode and the electron injection electrode, electrons and holes are paired and extinguished to emit light. Has the advantage. In addition, the organic EL display device can be formed on a flexible transparent substrate, such as plastic, and can be driven at a voltage lower than 10V compared to a PDP or an inorganic EL display device, and the power consumption is relatively low. Small, excellent color

1 is a cross-sectional view schematically showing an organic EL display device using a conventional glass cap, and FIG. 2 is a view for explaining the light emission principle of the organic EL display device shown in FIG.

The organic EL display device illustrated in FIG. 1 includes a first electrode (or anode electrode) 4 and a second electrode (or cathode electrode) formed on the substrate 2 so as to cross each other with an organic light emitting layer 10 interposed therebetween. 12) and an organic EL array 15 comprising a glass cap 28, and a glass cap 28 for packaging the organic EL array 15.

A plurality of anode electrodes 4 of the organic EL array 15 are spaced apart at predetermined intervals on the substrate 2. On the substrate 2 on which the anode electrode 4 is formed, an insulating film 6 having an opening for each EL cell EL region is formed. On the insulating film 6, a partition 8 for separating the organic light emitting layer 10 and the cathode electrode 12 to be formed thereon is positioned. The partition wall 8 is formed in a direction crossing the anode electrode 4 and has a reverse taper structure in which the upper end portion has a wider width than the lower end portion. On the insulating film 6 on which the partition 8 is formed, the organic light emitting layer 10 and the cathode electrode 12 made of an organic compound are sequentially deposited on the entire surface. The organic light emitting layer 10 includes an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer.

The organic EL array 15 has a property of being easily degraded by moisture and oxygen. To solve this problem, the organic EL array 15 is formed by encapsulation process in which the substrate 2 and the cap 28 on which the organic EL array 15 is formed are bonded through a sealant 25 such as an epoxy resin. ) Is protected from oxygen and moisture.

The glass cap 28 includes a getter 22 positioned on a surface facing the organic EL array 15 to absorb moisture and oxygen, and a semipermeable membrane 24 for fixing the getter 22. Equipped. Here, the getter 22 may be formed of inorganic oxide, that is, calcium oxide (Cao), barium oxide (BaO), or the like, which reacts with water to form hydroxyl groups (OH). Teflon, polyester, paper or the like is used to lift. On the other hand, the glass cap 28 is simple to manufacture compared to the metal cap in general, there is an advantage in forming a large element.

In the organic EL display device, as shown in FIG. 2, when a voltage is applied between the anode electrode 4 and the cathode electrode 12, electrons generated from the cathode electrode 12 are transferred to the electron injection layer 10a and the electron. It moves toward the light emitting layer 10c through the transport layer 10b. In addition, holes generated from the anode electrode 4 move toward the light emitting layer 10c through the hole injection layer 10e and the hole transport layer 10d. Accordingly, in the light emitting layer 10c, excitons are formed by recombination of electrons and electrons supplied from the electron transport layer 10b and the hole transport layer 10b, and the excitons are excited to the ground state and emit light of constant energy. The image is displayed by being discharged to the outside through the anode electrode 4.

Organic EL display elements having such a structure are widely used for communication means such as mobile phones. In particular, as the function of the mobile phone is gradually improved, a model having two windows in one mobile phone has been proposed. In the case of such an element, two organic EL arrays are used by having two windows, for example, a main window and a sub window. Accordingly, a problem arises in that the thickness of the mobile phone is increased and the device is easily damaged by external shock.

Accordingly, an object of the present invention is to provide an organic light emitting display device that can reduce the damage to the device to the external shock while thinning the mobile phone.

In order to achieve the above object, the organic electroluminescent display device according to the present invention is provided with a first concave region on the first surface and a smaller size than the first concave region on the second surface opposite to the first surface. A glass cap provided with a second concave region having; A first substrate formed with a first organic electroluminescent array packaged by the first concave region; And a second substrate on which a second organic light emitting array packaged by the second concave region is formed, wherein the areas of the first and second substrates are the same.

An area of the first and second substrates and an area of the glass cap are substantially the same.

The first and second substrates include a display area where an image is displayed and a non-display area that is a bonding area with the glass cap, wherein the display area of the second substrate is smaller than the display area of the first substrate, The non-display area of the second substrate is larger than the non-display area of the first substrate.

Each of the first and second concave regions may further include a getter positioned.

The first and second organic light emitting arrays may be different in size from each other.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 and 4.

First, prior to the detailed description of the embodiment of the present invention will be described with respect to the organic EL display element for mobile phones pre- filed by the applicant of the present invention directly related to the present invention.

3 is a view showing an organic EL display element having two organic EL arrays sharing one glass cap.

In the organic EL display device shown in FIG. 3, organic EL arrays are packaged on both surfaces of one glass cap 128, respectively.

The glass cap 128 has first and second recessed areas 136 and 138 that can package the first and second organic EL arrays 115 and 116, and a getter 122 in the center of each recessed area 136 and 138. Will be located. Here, the glass cap 128 may be formed by a manufacturing process such as a photo process, an etching process, and a sanding process.                     

The first substrate 102 on which the first organic EL array 115 is formed is bonded to the surface on which the first concave region 136 of the glass cap 128 is provided, and the second substrate on which the second organic EL array 116 is formed. 103 is bonded to the surface on which the second concave region 138 of the glass cap 128 is provided. Here, the first substrate 102 on which the first organic EL array 115 is formed becomes the main window of the mobile phone, and the second substrate 102 on which the second organic EL array 116 is formed serves as a sub window. . Accordingly, the second substrate 103 has a relatively small area compared to the first substrate 103.

As such, since the two organic EL arrays share one glass cap 128 in order to implement the main window and the sub window, the thickness of the organic EL display element in the entire mobile phone is significantly reduced. Accordingly, the mobile phone can be thinned. However, the structure of the second substrate 103 is smaller than that of the first substrate 102 so that the adhesion area between the second substrate 102 and the glass cap 128 is small. Accordingly, when the user drops the mobile phone to the ground, or when an external pressure or an impact is applied, the second substrate 103 may fall off or be damaged from the glass cap 128, and the second substrate 103 may be broken in severe cases. Things happen.

In order to solve this problem, an embodiment of the present invention proposes an organic EL display device as shown in FIG.

The organic EL display device according to the present invention has the same size and area as those of the first and second substrates 102 and 103 as compared with FIG. Each of the first and second substrates 102 and 103 includes a display area P1 in which an image is implemented and a non-display area P2 bonded to the glass cap 128 through the sealant 25. The display area P1 of the substrate 103 is smaller than the display area P1 of the first substrate 102, and the non-display area P2 of the second substrate 103 is formed of the first substrate 102. It is larger than the non-display area P2.

The second substrate 103 does not all serve as the display area P1 in which all of the images can be displayed. However, since the non-display area P2 is formed wider than before, the glass cap 128 and the second substrate ( The bonding area with 103 is increased. As a result, the bonding force between the glass cap 128 and the second substrate 103 is improved, so that the impact applied to the second substrate 103 by an external impact or the like can be alleviated. That is, unlike the structure shown in FIG. 3, since the second substrate 103 is more firmly attached to the glass cap 128, resistance to external pressure and impact may be further improved. In addition, an area of the first and second substrates 102 may be formed to be substantially the same as or slightly smaller than that of the glass cap 128. Accordingly, the second substrate 103 can be firmly attached to the glass cap 128 and can be sufficiently supported.

On the other hand, the first organic EL array 115 is used to implement the image of the main window is formed in a relatively larger size (size) than the second organic EL array 116 used to implement the image of the sub-window. Here, the first and second organic EL arrays 115 and 116 include an anode electrode and a cathode electrode formed to cross each other with the organic light emitting layer therebetween.

As described above, in the organic EL display device according to the present invention, the first organic EL array serving as the main window and the second organic EL array serving as the sub window share one glass cap. Accordingly, the size of the mobile phone that implements the main window and the sub window can be reduced.

In addition, the organic EL display device according to the present invention is formed such that the first substrate on which the first organic EL array is formed and the second substrate on which the second organic EL array is formed have the same area. Accordingly, the second substrate can be bonded to the glass cap in a large area as much as or more than the area where the first substrate is bonded to the glass cap, thereby allowing the second substrate to be firmly bonded to the glass cap. As a result, the resistance of the second substrate to withstand external pressure and impact is further improved, thereby minimizing damage due to impact on the device.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (5)

A glass cap having a first concave region on a first surface thereof and a second concave region having a smaller size than the first concave region on a second surface opposite to the first surface; A first substrate formed with a first organic electroluminescent array packaged by the first concave region; And a second substrate having a second organic electroluminescent light emitting device packaged by the second concave region, The area of the first and second substrates is the same as each other, the organic light emitting display device. The method of claim 1, The area of the first and second substrates and the area of the glass cap are substantially the same as each other. The method of claim 1, The first and second substrates A display area in which an image is displayed and a non-display area that is a bonding area with the glass cap, The display area of the second substrate is smaller than the display area of the first substrate, and the non-display area of the second substrate is larger than the non-display area of the first substrate. The method of claim 1, And a getter positioned in each of the first and second concave regions. The method of claim 1, And the first and second organic light emitting arrays have different sizes.

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