KR20050034878A - Dual-type organic electro luminesence display - Google Patents

Abstract

According to the present invention, a double-emitting organic light emitting display device is disclosed. The double-sided organic light emitting display device includes a first substrate serving as an image display surface, a first display area including a light emitting element, and a first circuit portion for supplying power to the first display area. And a second substrate disposed to face the first organic light emitting display device, the second substrate serving as a display surface of an image, a second display area including a light emitting element, and a second circuit portion for supplying power to the second display area. A second organic light emitting display device and bonding means for bonding the first organic light emitting display device and the second organic light emitting display device to seal at least the first and second display areas are provided. According to the disclosed double-sided organic light emitting display device, an independent image may be realized on both sides of the display device, and thus, a double-sided light emitting display device capable of reducing manufacturing costs and removing weight and thickness of the display device may be provided. Can be.

Description

Dual-type organic electro luminesence display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided organic light emitting display device, and more particularly, to a double-sided organic light emitting display device which can realize an image independent on both sides, and which is advantageous for weight reduction and thickness of the double-sided light emitting display device.

Electroluminescent display devices are attracting attention as next-generation display devices because of their advantages such as wide viewing angle, excellent contrast, and fast response speed.

The electroluminescent display is classified into an inorganic electroluminescent display and an organic electroluminescent display according to a material forming the light emitting layer.

Among them, in the organic light emitting display device, a transparent glass or a plastic plate is used as a substrate, and an organic film is formed by stacking a first electrode portion, a hole transport layer, an organic light emitting layer, an electron transport layer, and the like on top of the substrate, and a second layer on the top thereof. By sequentially stacking the electrode portions, a light emitting element is provided.

In the organic light emitting device having such a structure, when a potential difference is provided between the first electrode part and the second electrode part, holes injected into the hole transport layer and electrons injected into the electron transport layer are recombined in the organic light emitting layer to emit light.

Recently, many studies on a double-sided organic light emitting display device capable of realizing images on both sides of a display device have been conducted. The double-sided organic light emitting display device disclosed in Japanese Laid-Open Patent Publication No. 2001-332392 is characterized by an opaque cathode electrode, An electric field transport layer, an organic light emitting layer, and a hole transport layer are stacked between the transparent anode electrodes, and a transparent member is formed as a light guide portion on a portion of the opaque cathode electrode.

In the double-sided organic light emitting display device configured as described above, since the same image generated by one organic light emitting diode is extracted from both sides of the display device, it is impossible to implement independent images on both sides. have.

In order to solve this problem, a technique of implementing different images on both sides of the display device by bonding the organic light emitting diodes sealed with the sealing member to face each other, is used. According to the present invention, the space required for the sealing structure has a limitation in reducing the thickness of the display device, and the weight of the sealing member also limits the weight of the display device.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a double-side organic light emitting display device capable of realizing an independent image on both sides of the display device.

Another object of the present invention is to provide a double-sided organic light emitting display device which is advantageous in weight and thickness.

It is still another object of the present invention to provide a double-emitting organic light emitting display device having improved support structure and improved product reliability.

In order to achieve the above object, the double-emitting organic light emitting display device of the present invention comprises a first substrate serving as a display surface of an image, a first display area including a light emitting element, and a first supplying power to the first display area. A first organic light emitting display device having a first circuit portion, a second substrate disposed to face the first organic light emitting display device and serving as a display surface of an image, a second display area including a light emitting element, and the second display device. A second organic light emitting display device having a second circuit portion for supplying power to a display area, and the first organic light emitting display device and the second organic light emitting display so that at least the first and second display areas are sealed. Joining means for joining the apparatus.

In addition, the bonding means may include a spacer interposed between the first organic light emitting display device and the second organic light emitting display device and a hardened adhesive material applied around the spacer.

In addition, a moisture absorbent may be further included in the region sealed by the first substrate and the second substrate.

The area of the first display area may be wider than that of the second display area, and the absorbent material may be disposed around the second display area.

In addition, an area of the first display area may be wider than that of the second display area, and the driving IC of the second circuit part may be directly mounted on the second substrate.

In addition, the driving IC of at least one of the first circuit portion and the second circuit portion is disposed outside the region sealed by the first substrate and the second substrate, and the driving IC is at least one of the first substrate and the second substrate. It can be mounted directly on one substrate.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

1 is a cross-sectional view illustrating a double-sided organic light emitting display device according to an exemplary embodiment of the present invention, and FIGS. 2 to 5 illustrate a double-sided organic light emitting display device according to another embodiment of the present invention. It is a cross-sectional view.

Referring to FIG. 1, the double-sided organic light emitting display device 100 includes a first organic light emitting display device 10, a second organic light emitting display device 20, and a bonding means 5.

The first organic light emitting display device 10 includes a first substrate 11, a first display area 15 formed on the first substrate 11, a first circuit part 13, and a first wiring part. (17).

The first substrate 11 serving as the display surface of the image may be provided as a transparent glass substrate for light transmission.

The first display area 15 is disposed at substantially the center of the first substrate 11. The first display area 15 includes an emission part (not shown) to become an image display part for implementing an image.

The first circuit part 13 includes a vertical circuit part, a horizontal circuit part (not shown), and the like. The first circuit portion 13 and the first wiring portion 17 are mainly regions for supplying controlled power to the light emitting portion.

Meanwhile, the second organic light emitting display device 20 includes a second substrate 21, a second display area 25 formed on the second substrate 21, a second circuit unit 23, and a second circuit. The wiring part 27 is included.

The second organic light emitting display device 20 has the same configuration as the first organic light emitting display device 10 described above. Accordingly, the second substrate 21 may be provided as a transparent glass substrate for light transmission, and the second display area 25 is disposed at an approximately central portion of the second substrate 21. In addition, a second circuit part 23 including a vertical circuit part and a horizontal circuit part (not shown) and a second wiring part 27 are disposed around the second display area 25.

The first organic light emitting display device 10 and the second organic light emitting display device 20 configured as described above are bonded to each other by the bonding means 5, wherein the bonding means 5 includes spacers. (1) and the curing adhesive 2 can be used. That is, the spacer 1 is disposed at the edges of the first and second substrates 11 and 21, and a curing adhesive 2 is applied to the periphery thereof to contain the spacer 1.

The spacer 1 may be formed to have a predetermined size or more so that the first organic light emitting display device 10 and the second organic light emitting display device 20 do not come into contact with each other and are damaged.

Here, the spacer 1 may be provided as a regular body having a predetermined shape, in consideration of the support strength required for the spacer 1, for example, when four directions of support are required, the spacer 1 may be provided as a cross body. Can be. Glass or ceramic may be adopted as the material of the spacer 1.

As the cured adhesive 2, for example, a thermosetting resin or a UV curing resin may be used.

The double-emitting organic light emitting display device 100 may be implemented as shown in FIG. 2. Referring to the drawings, the first organic light emitting display device 10 and the second organic light emitting display device 20 are disposed to face each other, and the spacer 1 is formed by the joining means 5 of the organic light emitting display device 10 and 20. And a hardened adhesive material 2 are provided.

The spacer 1 is interposed between the first and second circuit portions 13 and 23 and between the first and second wiring portions 17 and 27, and the hardened adhesive material 2 is formed around the spacer 1. ), And the first and second organic light emitting display devices 10 and 20 are bonded to each other.

3 shows another embodiment of the present invention. As shown, the first display area 15 is formed over a larger area than the second display area 25. The moisture absorbing material 30 is provided on the second substrate 11 to protect the organic layers (not shown) of the first and second display areas 15 and 25 from moisture. The hygroscopic material 30 may be filled in the space formed through the etching.

Figure 4 shows another embodiment of the present invention. As shown, the first circuit portion 13 may be disposed outside the region sealed by the first and second substrates 11 and 21. In this case, the driving IC (not shown) constituting the first circuit unit 13 may be mounted in a chip on glass (COG) method, which is directly mounted on the first substrate without a separate surface mounting portion. have. At this time, if the internal wiring connecting the driving IC and the display area is provided in a multilayer structure, the line resistance can be reduced. In addition, since the circuit portion 13 is disposed in a portion other than the sealing region, the area of the display region 15 can be increased.

The bonding means 5 may be formed on the display areas 15 and 25. That is, as shown in FIG. 5, the bonding means 5 is provided with a spacer 1 and a hard adhesive 2, and the spacer 1 and the hard adhesive 2 are formed of first and second display areas. It is formed on top of (15,25). In this case, the sealing material 40 seals the edges of the first and second substrates 11 and 21 to protect the organic layers (not shown) formed in the first and second display regions 15 and 25. It can be applied to.

The spacer 1 may be formed of glass or ceramic. In addition, the spacer 1 may be formed integrally with a connecting member (not shown) therebetween. In this case, since the spacer 1 may be integrally handled, the process may be easily performed.

The spacer 1 formed inside the display area may be uniformly arranged in various patterns such as, for example, bar, lattice, and irregularities in a regular pattern.

A curable adhesive 2 is coated around the spacer 1 to enclose the spacer 1, where the curable adhesive 2 may be a thermosetting resin or a UV curable resin.

In the above exemplary embodiment, a protective film (not shown) may be further formed on the display areas 15 and 25 in which the spacer 1 is in contact with each other so that the first and second display areas 15 and 25 are protected. have. The protective film may be provided with an inorganic material or an organic material.

In addition, the first and second display areas 15 and 25 may be sealed with the spacer 1 and the hard adhesive 2 without using the sealing material 40.

According to the double-emitting organic light emitting display device 100 of the present invention, the following effects can be obtained.

Since the first organic light emitting display device 10 and the second organic light emitting display device 20 may be individually driven, an independent image may be realized on both surfaces of the display device 100.

In addition, a separate encapsulation structure is not required to protect the internal structure of the display device, and the first and second substrates 11 and 21 serve as encapsulation structures. Therefore, the number of parts can be reduced, compared to a double-sided light emitting display device in which an organic light emitting display device having a separate encapsulation structure is simply combined, thereby reducing manufacturing costs and lightening the display device. In addition, since the space required for the separate encapsulation structure can be removed, the thickness of the double-sided light emitting display device can be reduced.

In addition, when the spacer 1 is interposed between the first organic light emitting display device 10 and the second organic light emitting display device 20 by the bonding means 5 of the present invention, the first and second organic light emitting devices may be used. Since the distance between the electroluminescent display devices 10 and 20 can be kept constant, the warping and torsion of the entire display device can be prevented, and therefore, a display device which is advantageous for large size can be provided.

When COG mounting the circuit parts 13 and 23 of the first and / or second organic light emitting display device 10 or 20 of the present invention, a COG type display without a separate surface mounting portion may be implemented. Can be. In particular, if the circuit portions 13 and 23 are COG mounted in regions other than the portions sealed by the first and second substrates 11 and 21, the area of the display regions 15 and 25 in the sealing portion can be increased. .

According to the active driving flat panel display of the present invention configured as described above, the following effects can be obtained.

First, since each of the first organic light emitting display device and the second organic light emitting display device may be driven separately, an image independent of both surfaces of the display device may be realized.

Second, a separate encapsulation structure is not required to protect the internal structure of the display device, and the first and second substrates serve as encapsulation structures. Therefore, the number of parts can be reduced, compared to a double-sided light emitting display device in which an organic light emitting display device having a separate encapsulation structure is simply combined, thereby reducing manufacturing costs and lightening the display device. In addition, since the space required for the separate encapsulation structure can be removed, the thickness of the double-sided light emitting display device can be reduced.

Third, when the spacer is interposed between the first organic light emitting display device and the second organic light emitting display device by the bonding means of the present invention, the distance between the first and second organic light emitting display devices can be kept constant. Therefore, bending and twisting of the entire display device can be prevented, and in particular, damage to the electrode part that can occur due to pressurization of the electrode part can be prevented, so that a display device which is advantageous for large size can be provided.

Fourth, when the circuit part of the first and / or second organic light emitting display device of the present invention is COG mounted, a COG type display without a surface mounting portion may be implemented. In particular, when the circuit portion is COG mounted in a region other than the portions sealed by the first and second substrates, the area of the display region can be increased in the sealing portion.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible for those skilled in the art to which the present invention pertains. You will understand the point. Accordingly, the true scope of protection of the invention should be defined by the appended claims.

1 is a cross-sectional view showing a double-emitting organic light emitting display device according to an embodiment of the present invention;

2 to 5 are cross-sectional views illustrating a double-sided organic light emitting display device according to another embodiment of the present invention.

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

1: spacer 2: curing adhesive

5: bonding means 10: first organic light emitting display device

11: first substrate 13: first circuit portion

15: first display area 17: first wiring portion

21: second substrate 23: second circuit portion

25: second display area 27: second wiring part

30: moisture absorbing material 40: sealing material

100: double-sided organic light emitting display device

Claims (6)

A first organic light emitting display device having a first substrate serving as a display surface of an image, a first display area including a light emitting element, and a first circuit portion for supplying power to the first display area; A second substrate disposed to face the first organic light emitting display device, the second substrate serving as a display surface of an image, a second display region including a light emitting element, and a second circuit portion for supplying power to the second display region; A second organic light emitting display device; And bonding means for bonding the first organic light emitting display device and the second organic light emitting display device so that at least the first and second display regions are sealed. The light emitting device of claim 1, wherein the bonding means comprises a spacer interposed between the first organic light emitting display device and the second organic light emitting display device and a hardened adhesive material applied around the spacer. Organic light emitting display device. The device of claim 1, wherein a moisture absorbent is further provided inside the region sealed by the first substrate and the second substrate. The device of claim 3, wherein an area of the first display area is wider than that of the second display area, and the absorbent material is disposed around the second display area. The double-sided organic light emitting diode of claim 1, wherein an area of the first display area is wider than an area of the second display area, and the driving IC of the second circuit part is directly mounted on the second substrate. Display device. The driving IC of claim 1, wherein the driving IC of at least one of the first circuit portion and the second circuit portion is disposed outside the region sealed by the first substrate and the second substrate, and is disposed outside the sealed region. The IC is directly mounted on at least one of the first substrate and the second substrate.