KR100700719B1 - Organic light emitting diode of multi-faces - Google Patents

Abstract

An organic electroluminescent device and a method of manufacturing the same are disclosed.

An organic electroluminescent device according to the present invention comprises at least one organic electroluminescent device formed by selectively laminating at least one red, green, blue and / or white light emitting layer, which is three primary colors of light, and a sealant of these organic electroluminescent devices. By sealing the fastening using, to implement a multi-sided light source such as a two-sided light source, a three-sided light source, a four-sided light source, and can be implemented in various forms in various devices, such as a mobile phone that requires one or more display unit, compact size, Simplifies the manufacturing process while achieving high resolution in comparison with the conventional liquid crystal display device while providing power efficiency arrangement, excellent response, uniformity of light, high brightness, improved durability, and miniaturization as well as medium and large size. As a result, it is possible to improve productivity and provide inexpensive manufacturing costs. It relates to electroluminescent multiple surface-emitting device and its manufacturing method.

 Bottom emission, calcium oxide (CaO), barium oxide (BaO), moisture absorbent, sealant, can, liquid crystal display (LCD), back light, getter ( Getter, Dopant

Description

ORGANIC LIGHT EMITTING DIODE OF MULTI-FACES}

1 is a configuration diagram of a general mobile phone having two display windows.

FIG. 2 is a cross-sectional view of a configuration of the liquid crystal display of FIG. 1. FIG.

3 is a cross-sectional view of the backlight unit of FIG.

Figure 4 is a cross-sectional view of the backlight unit of Figure 2 according to the edge light emitting form.

5 is an exemplary configuration diagram showing a state in which the organic electroluminescent multi-light emitting device according to the present invention is applied to a mobile phone.

6 is a cross-sectional view of a structure of an organic electroluminescent device according to the present invention.

FIG. 7 is a cross-sectional view illustrating in detail the organic electroluminescent device of FIG. 5. FIG.

8 is a graph showing emission spectra according to wavelength and intensity change of white light by a conventional organic electroluminescent device.

FIG. 9 is a graph showing emission spectra according to wavelengths and intensities of green light emitted by conventional organic EL devices. FIG.

FIG. 10 is a graph illustrating emission spectra of wavelengths and intensities of white light and green light in which an organic electroluminescent device according to the present invention is formed by stacking a white light emitting layer and a green light emitting layer, respectively, on a first and a second light emitting unit.

FIG. 11 is a graph illustrating emission spectra of wavelengths and intensities of white light and green light, in which the first and second light emitting layers of FIG.

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FIG. 13 is a cross-sectional view for maintaining and forming a constant gap between two rear organic electroluminescent devices constituting an organic electroluminescent device according to the present invention; FIG.

14 is an exemplary configuration diagram of a state in which an organic electroluminescent device according to the present invention is implemented in a medium and large size.

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

500: organic electroluminescent device 600: organic electroluminescent device

611: first light emitting unit 612: second light emitting unit

620: substrate 630: light diffusion layer

640: epoxy or sealant

650: the absorbent (Getter) 663: third electrode

The present invention relates to a separate stacked organic electroluminescent device for a bidirectional backlight light source and a method of manufacturing the same, and in particular, an organic electric field in which one or more are selectively laminated from the three primary colors of red, green, blue, and / or white light emitting layers. The present invention relates to a high brightness white and monochromatic organic electroluminescent multi-surface light-emitting device comprising one or more light-emitting elements and sealing them to each other to achieve light output in multiple planes, and a method of manufacturing the same.

The general mobile phone has an outer window 41 and an inner window 42, which are respectively disposed at the front and the inside thereof, and each of the outer window 41 and the inner window 42 has to be provided with backlight units 41a and 42a. As the thickness and volume are implemented relatively large, there was a problem that the mobile phone having a simple appearance could not be designed and designed. (See FIG. 1).

In addition, as the aforementioned display windows 41 and 42 require a lot of power for operating the backlight units 41a and 42a, overdischarge of the battery and consequently greatly deteriorate the battery life. There was another problem, such as providing a (not shown 43 and 44 are keypads and batteries, respectively).

Such a display device generally employs a liquid crystal display device 10 having the configuration as shown in FIG. 2.

The liquid crystal display 10 (LCD: Liquid Crystal Display) is formed by enclosing the liquid crystal 12 between two glass substrates, the liquid crystal that can adjust the amount of light transmitted through the substrate by adjusting the voltage intensity It is a display mechanism using the electro-optical properties of (see Fig. 2).

Referring to FIG. 2, the liquid crystal display 10 will be described in more detail. The liquid crystal display 10 includes a backlight unit 11, a liquid crystal 12, and a color filter 13. Since the liquid crystal 12 does not emit light by itself and merely performs a light amount adjusting function, there is a problem in that an image cannot be observed in a dark place.

Accordingly, the backlight unit 11 is used as a light source so that the image can be observed even in a dark place. The backlight unit 11 has a direct light type and an edge according to the arrangement of the light source. It is divided into two types (Edge Light Type) (see Figs. 3 and 4).

Referring to FIGS. 3 and 4, the direct emission type and the edge emission type, in the direct emission type backlight unit 20, a plurality of light sources 21 are arranged at regular intervals, and below the light source 21. In this case, the reflecting plate 22 and the protective plate 23 are sequentially positioned, and the light diffusing plate 24 and the prism plate 25 are sequentially arranged above the light source 21.

On the other hand, the edge emitting type backlight unit 30 includes a light diffusion plate 34 and a prism plate 35 above the light guide plate 32, and a reflecting plate 33 below the light guide plate 32. In addition, the light guide plate 32 includes a light source 31 provided with a light source cover 36 for condensing light on a portion of the light guide plate 32 adjacent to the side surface.

Here, the light sources 21 and 31 generally use a cold cathode fluorescent lamp (CCFL) and the like, and since they are all linear light sources instead of surface light sources, the reflector plates 22 and 33 are used as described above. , A light guide plate 32, diffuser plates 24 and 34, and prism plates 25 and 35, and have a complex structure composed of various optical sheets.

As a result, in the liquid crystal display 10, the liquid crystal 12 for adjusting gray scale is positioned on the upper portion of the backlight unit 11 as shown in FIG. 2 and expresses color. In order to achieve the color filter 13 had to be provided.

In the conventional liquid crystal display, the power consumption of the backlight unit occupies 50 to 70% of the total power consumption, and the light emitted from the light source disappears about 90% while passing through the optical sheet, the liquid crystal, and the color filter. Only 10% of the time is externally expressed.

In addition, as the display becomes larger and thinner, a large number of light sources must be provided in order to obtain a high amount of light. As a result, power consumption is increasing day by day, and the cold cathode fluorescent lamp described above is used for a long time. In addition, the uniformity of the visual luminance is not sharply lowered, and as described above, when a plurality of light sources are used, the surface temperature of the backlight unit is increased to make it impossible to easily control the liquid crystal.

For the above reasons, the liquid crystal display device using the backlight unit has a difficult aspect of medium and large size, and since the color is inevitably implemented through the color filter, many problems in the manufacturing process have been derived, and the color reproduction rate is about 40%. As it was implemented, high resolution could not be expected, resulting in a largely limited viewing angle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and includes a plurality of back-emitting organic electroluminescent devices and seals them at regular intervals through sealants and spacers to emit light independently of one light emitter. An object of the present invention is to provide an organic electroluminescent multi-surface light emitting device which is made to be implemented and can achieve light emission of the same emission luminance in multiple planes, that is, in both directions.

Another object of the present invention, when the bi-directional light source such as a mobile phone can be carried out as a single device to perform bi-directional light emission, it is possible to significantly reduce the thickness and volume of the display device to implement a thin film device, of course, The present invention provides an organic electroluminescent light emitting device that can significantly reduce power consumption and greatly extend the life of a battery.

Still another object of the present invention is that the organic light emitting layer is composed of one or more multilayers, which is excellent in color purity and color reproducibility, ensures high brightness and uniformity of the emitted light, and of course, comprises a positive electrode or a negative electrode that is transparent to the organic light emitting layer. An organic electroluminescent device is provided.

Still another object of the present invention is to seal two organic electroluminescent devices emitting backside light, so that each device can serve as a can of another device, and thus a stainless can for sealing process can be used. The present invention provides a method for manufacturing an organic electroluminescent device that can omit a component such as a glass can or a glass can, and also a manufacturing process thereof.

As a feature of the organic EL device according to the present invention for achieving the above object,

A substrate, a first electrode formed on one surface of the substrate and serving as a positive electrode, a first light emitting part formed on the first electrode and emitting light having a predetermined wavelength, and protecting the first light emitting part The ultra-thin metal electrode layer formed on the first light emitting portion, the second electrode formed on the ultra-thin metal electrode layer, and the wavelength formed on the second electrode and different from the wavelength of light emitted from the first light emitting portion A plurality of organic electroluminescent elements comprising a second light emitting part for emitting light having a light emitting portion, and a third electrode formed on the second light emitting portion; A sealant of a transparent material which is disposed along the edge surface of the substrate so that the plurality of organic electroluminescent elements are disposed to face each other in different directions to integrally seal the plurality of organic electroluminescent elements; It comprises a moisture absorbent in the recess formed on the inner substrate sealed by the sealant has a configuration feature made to be utilized as a double-sided light source or a multi-sided light source.

Here, the ultra-thin metal electrode layer, as implemented with a transparent material, is preferably made to improve the light transmission efficiency.

In addition, the light diffusion layer is further formed on the portion of the substrate through which the light is transmitted, or stacked as a separate sheet layer is more preferably implemented to emit the uniformity and high brightness of the light emitted.

Meanwhile, the first light emitting unit or the second light emitting unit is made of one or more organic light emitting materials,

The organic light emitting material may include a host light emitting material selected from Alq ₃ , NPB, CBP, and DPVBi having a large energy band gap; An organic dopant luminescent material selected from green dopant C545T, red dopant DCM2, and DCJTB, blue dopant perylene; This is preferably doped.

In addition, the substrate is preferably made of a thin film silicon wafer and a glass or flexible synthetic resin material.

The first light emitting part or the second light emitting part is formed by sequentially stacking a transparent positive electrode, a hole injection layer, a hole transport layer, a light emitting layer, a hole limiting layer, an electron transport layer, and an electron injection layer on the substrate.

The ultra-thin metal electrode layer may be formed by stacking one or more of LiF / Al / Ag, Ca / Ag, or Ag / Ca, thereby preventing damage to the light emitting device, and alloying the organic light emitting layers with each other. To adjust the work function of the metal and to increase the adhesion to the organic light emitting layer, it is preferable that the ultra-thin metal electrode layer is made of 0.1 ~ 20nm thickness.

Here, the second electrode formed on the ultra-thin metal electrode layer is plasma-treated for a predetermined time using oxygen, argon, and nitrogen ions under atmospheric pressure or vacuum to increase the work function of the ITO and increase the adhesion to the organic material. This is ideal.

The sealant may be formed by being mixed with a spacer having a spherical and square pillar shape and inserted between the two organic EL devices.

On the other hand, on the part surface through which the light is transmitted in the substrate, the transparent epoxy resin and SiO ₂ powder is preferably added and applied to ensure the optical uniformity of the emitted light, it is preferably made to obtain high brightness.

Here, the light diffusion layer, the transparent diffusion sheet in the form of a film having a high refractive index is bonded to the substrate, or a high refractive index transparent epoxy resin is applied, the thickness of the coating layer is made of about 1㎛ ~ 1mm Is most preferred.

Preferably, as the ultra-thin metal electrode layer is patterned in a uniform shape, the production efficiency and durability may be improved.

As a manufacturing method of the organic electroluminescent device according to the present invention having such a structural feature,

a) forming a positive electrode on the transparent substrate;

b) sequentially forming a hole injection layer, a hole transport layer, a light emitting layer, a hole limiting layer, an electron transport layer, an electron injection layer on the upper surface of the positive electrode to form a light emitting portion;

c) forming a transparent electrode on the light emitting unit by using ITO;

d) forming an ultra-thin metal electrode layer between the light emitting part and the transparent electrode with one or more of LiF / Al, Ag, Ca, Mg, selectively 0.1 to 20 nm thick;

e) inserting a moisture absorbent between the two organic electroluminescent devices having completed the steps a) to d), and sealingly fastening with a sealant of a transparent material;

It is made, including.

At this time, any one of the steps a) to e), f) forming a light diffusion layer on the portion of the substrate through which light is transmitted; As it proceeds further to be made to obtain the uniformity of the emitted light and the emitted light source of high brightness.

Further, in any one of the steps a) to e), the electrode pads are designed to be positioned so that each of the different organic electroluminescent devices, which are sealed to each other, may have different light emitting regions, and are electrically connected to the positive electrode and the negative electrode. Is preferably formed in different positions so that they do not overlap each other.

On the other hand, in any one of the steps a) to e), further comprising the step of forming a groove on the substrate in the step e) the hygroscopic (BaO, CaO, MgO) in the groove The feeding step may also proceed.

In addition, the step b) may be implemented by selecting from vacuum thermal vapor deposition, laser beam deposition, ink jet printing, color patterning deposition,

In step c), RF sputter, RF grid sputter, DC sputter, DC pulse sputter, DC pulse sputter, ALD (atomic layer deposition), PEALD (plasma enhanced atomic) layer deposition).

On the other hand, step e), it is preferable to proceed in a high-purity nitrogen atmosphere or vacuum state,

Step e),

i) inserting and aligning two organic electroluminescent elements in a fixing frame (Zig),

ii) applying and combining the absorbent insert and sealant,

iii) more preferably, simultaneously cutting the upper substrate and the lower substrate.

As another manufacturing method of the organic electroluminescent device according to the present invention,

a) disposing two organic light emitting elements so as to face each other, and then forming a pattern using PR, SiO ₂ , and SiN _x on mutually opposing substrates of the organic light emitting elements;

b) forming a first light emitting unit, a second light emitting unit, and a top negative electrode;

c) forming a SiO layer as a barrier layer on the uppermost negative electrode;

d) forming a thin film protective layer using Ca, CaO, Ba, BaO, Mg, MgO;

e) applying and inserting a sealant and a moisture absorbent along the edge surface of the substrate with a constant distance between the two organic EL devices, and sealing sealing the organic EL devices;

It may be made, including.

As another manufacturing method of the organic electroluminescent device according to the present invention,

a) disposing two organic light emitting devices so as to face each other, and then patterning PR, SiOx, and SiNx in a mesh shape or a tile shape on opposite substrates of the organic light emitting devices;

b) laminating a light emitting layer, a barrier layer, and a protective layer on the pattern formed by step a);

c) inserting an absorbent and a sealant along the pattern edge formed by the step a) to mutually fasten the two organic EL devices;

It is also made to be able to easily achieve the medium and large size.

Other objects and specific advantages of the present invention will become more apparent through the following detailed description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 5 is an exemplary configuration diagram showing a state in which the organic electroluminescent multi-light emitting device according to the present invention is applied to a mobile phone, FIG. 6 is a cross-sectional view of the organic electroluminescent multi-light emitting device according to the present invention, and FIG. It is a sectional drawing which shows the organic electroluminescent element in detail.

6 and 7, in the organic electroluminescent device 500 according to the present invention, as shown in FIG. 6, two organic electroluminescent devices 600 emitting back light are positioned upward and downward, respectively. Arranged so as to face each other so as to be mutually sealed fastening using a sealant 640, the organic electroluminescent device 500 according to the present invention implemented as described above is applied to a mobile phone as shown in FIG. Through the light source 45, the internal and external display windows (41, 42) can be implemented to achieve a light display with the same brightness, so as to reduce the power consumption can greatly extend the life of the battery, as well as thinning of the mobile phone There is an advantage such that it can be planned.

Referring to FIG. 7, the organic electroluminescent device 600 will be described in more detail. The first light emitting unit 611 and the second light emitting unit 612 are stacked to form the organic electroluminescent device 600. The positive electrode 661 formed on the substrate 620, the organic material layers 601, 602, 604, 605, and 651, the ultra thin metal electrode layer 606, and a negative electrode and a transparent material that functions as a positive electrode. The second electrode 662 and the organic layers 601, 602, 604, 605, and 652, and the third electrode 663, which is a negative electrode, are sequentially stacked on the transparent electrode 662.

In more detail, the organic EL device 600 is provided with a transparent substrate 620.

At this time, the positive electrode 661, which is a first electrode patterned with a black matrix PR, is stacked on the substrate 620, and the first electrode 661 is transparent conductive such as indium tin oxide (ITO) having a high work function. Is implemented.

Here, the ITO film is formed in a predetermined thin film form by a general sputtering method, and in forming the first electrode 661, a transparent insulator such as photoresist (PR), SiO _X , SiN _X , or the like is used. After a predetermined pattern is formed, plasma treatment is performed for a predetermined time using oxygen and / or nitrogen ions at atmospheric pressure or in vacuum to obtain a high work function.

Next, the organic material layer is formed on the substrate 620 on which the first electrode 661 is formed using an organic material as follows.

On the substrate on which the first electrode 661 is formed, a hole injection layer 601 using CuPC, MTDATA, etc., a hole transport layer 602 using NPB, TPD, etc., a blue light emitting layer DPVBi, and a red light emitting layer Alq ₃ : The white light emitting layer 651 made of DCJTB (1%), the electron transport layer 604 made of Alq ₃ , and the electron injection layer 605 made of LiF, BCP: Cs are successively deposited by vacuum thermal evaporation. The light emitting part 611 is formed.

Subsequently, a second electrode 662 of a transparent material, which is both a negative electrode and a positive electrode, is formed on the first light emitting unit 611. More specifically, in order to minimize the damage of the already formed organic thin film, LiF An ultra-thin metal electrode layer 606 composed of / Al / Ag or Ca / Ag is formed by a vacuum thermal vapor deposition method.

In this case, a transparent second electrode 662 made of transparent ITO is formed on the ultra-thin metal electrode layer 606 in a sputtering manner in the sputter chamber where the ITO target is installed.

Subsequently, a second light emitting part 612 is formed on the second electrode 662 in the same manner as the first light emitting part 611, but Alq is used as the light emitting layer 652 of the second light emitting part 612. _An organic light emitting material such as ₃ or Alq ₃ : C545T is used to form green light.

At this time, Al, which is a third electrode 663, is formed on the top surface of the second light emitting part 612, and one or more protective layers are formed on the third electrode 663 to protect the moisture-proof function and the light emitting device. 664 is configured.

The protective layer 664 is formed using an organic film such as NPB or Alq ₃ or an inorganic film such as SiN _X or SiO _X.

Subsequently, on the opposite side of the substrate 620 where the light emitting layer is not formed, an epoxy resin layer of a transparent material having a large refractive index, or a light diffusing layer 630 such as a diffusion sheet is used to improve light straightness and light emission efficiency. Has an applied configuration.

FIG. 8 is a graph illustrating emission spectra of wavelengths and intensities of white light emitted by a conventional organic EL device, and FIG. 9 is a graph illustrating emission spectra of wavelengths and intensities of green light sources emitted by a conventional organic EL device. It is a graph.

Referring to FIG. 8, a white light emitting layer including ITO is formed on a transparent glass substrate with a thickness of 120 nm as a positive electrode, and thereon, a NPB 60 nm as a hole transporting layer, DPVBi 15 nm as a blue light emitting layer, and Alq ₃ : DCJTB (1%) 10 nm as a red light emitting layer. And Alq ₃ 35 nm as an electron transport layer, LiF 1 nm as an electron injection layer, and Al 100 nm as a negative electrode were formed.

As can be seen in FIG. 8, it can be seen that blue light emission is started at 450 nm and red light emission is started at 610 nm. Here, although the spectrum of FIG. 8 shows white light emission, it can be understood that green light emission is insufficient to be used as a backlight light source.

Meanwhile, referring to FIG. 9, a general green organic electroluminescent device is the same as the device structure showing the emission spectrum of FIG. 8 described above, and the light emitting layer is made of Alq ₃ 30 nm, which is a green light emitting material, and green light emission is started at 534 nm. Can be observed.

Here, the blue and red light emitting layer is composed of the first light emitting unit 611 in the same manner as the device structure of FIG. The emission spectrum of the organic EL device having the green light emitting layer as the second light emitting unit 612 is shown for each wavelength and intensity change.

FIG. 10 is a view illustrating an emission spectrum according to wavelengths and intensities of white light and green light, in which the organic electroluminescent light emitting device 500 according to the present invention stacks a white light emitting layer and a green light emitting layer on each of the first and second light emitting units. FIG. 11 is a graph illustrating emission spectra of wavelengths and intensities of white light and green light stacked on the first and second light emitting parts of FIG.

Referring to FIG. 10, although the green light emission of the second light emitting unit 612 is mixed with the white light emitting source of the first light emitting unit 611 to form light, the light emission luminance is deteriorated due to the optical effect. In addition, the white light emission spectrum of the first light emitting unit 611 may also observe that the light emission luminance of the blue light source is lower than that of the red light source due to the optical effect.

On the contrary, referring to FIG. 11, although the light emission luminance of the white light emitting source of the second light emitting unit 612 is lower than that of the blue light emitting source due to the optical effect, the light emission of the green light of the first light emitting unit 611 is reduced. It can be seen that the red, green, and blue light emitting sources are properly mixed due to the circle, thereby revealing the white light source.

Therefore, the structure of the organic electroluminescent device according to the present invention is to improve the deficient emission luminance of the red, green or blue light emitting source generated when the structure of the organic electroluminescent device is the same as that of the conventional organic electroluminescent device, that is, a single light emitting layer For this purpose, there is an advantage that can be solved by stacking one or more light emitting layers.

Hereinafter, an organic electroluminescent multi-light emitting device equipped with at least one organic electroluminescent device according to the present invention manufactured as described above and usable as a multi-plane backlight light source will be described in detail.

A plurality of organic EL devices are manufactured in the same manner as described above.

More specifically, referring to FIG. 7, in order to prevent penetration of moisture and oxygen into the inside of the two organic electroluminescent devices, a transparent epoxy or sealant 640 is formed on the organic light emitting devices. A moisture absorbent may be applied on the surface between the sealant 640 and the organic light emitting layer of the substrate 620 so as to be applied along the edge surfaces of the substrate 620 facing each other and to remove moisture and oxygen remaining therein. After the 650 is inserted, the two organic light emitting diodes are hermetically sealed.

Here, in the step of inserting the absorbent, a groove for injecting the absorbent on the substrate 620 is generated by a scratch generating method or the like, and the substrate 620 by injecting the absorbent onto the thus formed groove. The moisture absorbent is preferably made so as not to leak out of the phase.

In addition, when the two organic electroluminescent devices 600 are combined, spacers are inserted between the organic electroluminescent devices 600 so as to maintain an appropriate interval, or an epoxy or sealant 640 of a transparent material may be used. May be applied to the light emitting layer as well as the edge of the substrate 620 to completely remove the moisture and oxygen from the beginning.

In such a method, when the firing step is performed for a long time at a relatively low temperature during firing, there is an effect of preventing damage to the light emitting layer.

Preferably, it is ideal to proceed in a high-purity nitrogen atmosphere or in a vacuum state when combining the two organic electroluminescent devices 600 as described above.

FIG. 13 is a cross-sectional view for maintaining and forming a constant gap between two backside organic electroluminescent devices constituting the organic electroluminescent device according to the present invention. FIG. 14 is an organic electroluminescent device according to the present invention. A structural example for implementing medium and large sized.

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On the other hand, as shown in Figure 13, in combining the two organic electroluminescent devices, after forming a pattern of PR, SiO2, SiNx, the light emitting layer and the top negative electrode is formed, and the SiO layer as a barrier layer on the top negative electrode In addition, after the protective layer is stacked with a material such as Ca, CaO, Ba, BaO, Mg, MgO, or the like in the form of a thin film, the distance between the two back-emitting devices may be made constant.

In addition, as illustrated in FIG. 14, after forming the light emitting layer, the barrier layer, and the protective layer, the absorbent 650 and the sealant 640 are inserted into the edge of the pattern to be combined to achieve a medium and large size relatively easily. .

The present invention can be variously modified.

As an example, in the present specification, only two surfaces, that is, bidirectional light emitting forms, are described in detail, but a multi-sided light source such as a three-sided light source and a four-sided light source may be implemented, which is manufactured by a plurality of organic electroluminescent devices as described above. After the positioning is completed, it is also possible to firmly seal and fasten each other by using the part surfaces of the elements adjacent to each other, an absorbent, a sealant, and the like, which are also within the technical scope of the present invention.

As mentioned above, if it is based on this invention, the following effects can be acquired.

As a display such as a liquid crystal display device, by using an organic electroluminescent element, high viewing angle, fast response speed, and low power driving are possible;

When the bidirectional backlight light source is manufactured in the above manner, the backlight light source of the mobile phone internal LCD and the external LCD that is currently used can be manufactured as one, so that the thickness can be significantly reduced when applied to the bidirectional display;

When the external light is strong, the third electrode can be used as a reflecting plate can be applied to the reflective display, of course;

The organic electroluminescent devices serve as glass cans of different organic electroluminescent devices, and thus, a glass can or a stainless steel can is not used in the encapsulation process, and thus a large profit can be obtained in the manufacturing process;

Transparent substrates, such as glass or synthetic resin substrates, are used as the substrate of the organic electroluminescent device, and light uniformity is provided by inserting a light diffusion layer on the opposite side of the substrate of the organic electroluminescent device layer stacked along the electrode surface of the transparent substrate. It is a very useful invention with the advantage that it can also be used as a high brightness backlight light source.

Claims (19)

A substrate, a first electrode formed on one surface of the substrate and serving as a positive electrode, a first light emitting part formed on the first electrode and emitting light having a predetermined wavelength, and protecting the first light emitting part The ultra-thin metal electrode layer formed on the first light emitting portion, the second electrode formed on the ultra-thin metal electrode layer, and the wavelength formed on the second electrode and different from the wavelength of light emitted from the first light emitting portion A plurality of organic electroluminescent elements comprising a second light emitting part for emitting light having a light emitting portion, and a third electrode formed on the second light emitting portion; A sealant of a transparent material which is disposed along the edge surface of the substrate so that the plurality of organic electroluminescent elements are disposed to face each other in different directions to integrally seal the plurality of organic electroluminescent elements; A moisture absorbent embedded in a groove formed on an inner substrate sealed by the sealant; And Organic light-emitting device comprising a light diffusion layer formed on the other surface of the substrate to be utilized as a double-sided light source or a multi-sided light source. The method of claim 1, wherein the ultra-thin metal electrode layer, An organic electroluminescent device comprising a transparent material. delete The method of claim 1, wherein the first light emitting unit, An organic electroluminescent device comprising a blue light emitting layer and a red light emitting layer. The method of claim 1, wherein the second light emitting unit, An organic electroluminescent device comprising a green light emitting layer. delete The method of claim 1, wherein the first light emitting unit or the second light emitting unit, An organic electroluminescent device comprising a hole injection layer, a hole transport layer, a light emitting layer, a hole limiting layer, an electron transport layer, and an electron injection layer sequentially stacked. The method of claim 1, wherein the ultra-thin metal electrode layer, An organic electroluminescent device comprising a stack of any one of LiF / Al / Ag, Ca / Ag, and Ag / Ca. delete delete delete delete delete delete delete delete delete delete delete

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