KR20040042249A - Organic electro luminesence display device with liquid crystal display portion - Google Patents

Abstract

PURPOSE: An OELD including a liquid crystal display is provided to reduce power consumption and realize a high quality image by adopting a liquid crystal display as a sub screen. CONSTITUTION: An OELD including a liquid crystal display comprises a first substrate(10) made of a transparent material, an organic electro luminescent display(20) formed on one surface of the first substrate and having an organic lighting layer(22) formed between two electrodes(21,23) arranged oppositely each other, and a liquid crystal unit(30) formed on the other surface of the first substrate and including a liquid crystal(34) between two electrodes(32,33) arranged oppositely each other. The liquid crystal display uses one of the electrodes of the organic electro luminescent display as a reflection plate.

Description

Organic electroluminescent display device having a liquid crystal display unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display, and more particularly, to an organic electroluminescent display equipped with a liquid crystal display having low power consumption.

In general, an organic light emitting display device is a self-luminous display that emits light by electrically exciting a fluorescent organic compound, and can be driven at a low voltage and can be thinned. Has an advantage. In addition, the organic light emitting display device is attracting attention as a next-generation display that can solve the disadvantages pointed out as a problem in the liquid crystal display device, such as wide viewing angle, fast response speed.

The organic light emitting display device is formed by forming an anode in a predetermined pattern on glass or other transparent insulating substrate, forming a light emitting layer with an organic film on the anode, and sequentially stacking cathodes of a predetermined pattern so as to be orthogonal to the anode. do. At this time, the organic film has a structure in which a hole transporting layer, an organic light emitting layer, and an electron transporting layer are sequentially stacked from the bottom, and each of the organic film layers alone or in combination of a plurality of layers to form a light emitting layer.

When voltage is applied to the anode and the cathode of the organic light emitting display device configured as described above, holes injected from the anode are moved to the organic light emitting layer via the hole transport layer, and electrons are transferred from the cathode to the organic light emitting layer via the electron transport layer. Is injected into. In this organic light emitting layer, electrons and holes recombine to generate excitons, and as the excitons change from the excited state to the ground state, the fluorescent molecules of the organic light emitting layer emit light to form an image.

On the other hand, the organic electroluminescent display as described above can be used with a liquid crystal display, a conventional organic electroluminescent display is used as a lighting device such as a back light (light) of the liquid crystal display. That is, US Patent No. 5,965,907 discloses a liquid crystal display in which an organic electroluminescent display composed of three layers is used as a backlight of three colors of red, green, and blue, and US Patent No. 5,796,509 discloses an organic electroluminescent display. A liquid crystal display device in which the display device is used as a backlight or a front light is disclosed. In addition, Korean Unexamined Patent Publication No. 1999-28896 also discloses a liquid crystal display using an organic electroluminescent display as a lighting device.

As such, in the related art, the organic electroluminescent display is used only for the illumination of the liquid crystal display, and thus, the response of the organic electroluminescent display may not be sufficiently utilized because the response is excellent and the video is smoothly implemented.

In addition, the organic electroluminescent display device consumes less than 100 mW and consumes less power than a transmissive liquid crystal display, but uses more power than a reflective liquid crystal display of several to several tens of mW. There was a problem such as the use of a high capacity battery.

In order to solve the above problems, the present invention is to provide an organic electroluminescent display device having a liquid crystal display that can implement a high-quality image while reducing unnecessary power consumption by adopting the liquid crystal display as an auxiliary screen. There is a purpose.

It is another object of the present invention to provide an organic electroluminescent display having a liquid crystal display unit which can reduce the thickness by using a liquid crystal display unit and an organic electroluminescent display unit sharing a single substrate and using one electrode of the organic electroluminescent display unit as a reflector of the liquid crystal display unit. To provide a device.

1 is a cross-sectional view illustrating a schematic configuration of an organic light emitting display device having a liquid crystal display according to a first exemplary embodiment of the present invention.

2 is a cross-sectional view illustrating a schematic configuration of an organic light emitting display device having a liquid crystal display according to a second exemplary embodiment of the present invention.

3 is a cross-sectional view illustrating a schematic configuration of an organic light emitting display device having a liquid crystal display according to a third exemplary embodiment of the present invention.

4 is a cross-sectional view showing another preferred embodiment of the second substrate of FIG.

5 is a cross-sectional view illustrating a schematic configuration of an organic light emitting display device having a liquid crystal display according to a fourth exemplary embodiment of the present invention.

<Brief description of the main parts of the drawing>

10: first substrate 20, 20 ': organic electroluminescent display

21, 21 ': first electrode layer 22: organic light emitting film

23, 23 ': second electrode layer 24, 24': sealing structure

26: sealing substrate 30, 30 ': liquid crystal display

31, 36: second substrate 32: third electrode layer

33: fourth electrode layer 34: liquid crystal

In order to achieve the above object, the present invention provides an organic electroluminescent display comprising a first substrate of a transparent material, and an organic light emitting film formed between two electrodes disposed opposite to each other and formed on one surface of the first substrate; And a liquid crystal display formed on the other surface of the first substrate and including a liquid crystal between two electrodes disposed to face each other, and using any one electrode of the organic light emitting display as a reflecting plate. An organic electroluminescent display device having a liquid crystal display unit is provided.

According to another feature of the present invention, the organic electroluminescent display and the liquid crystal display may share the first substrate.

According to another feature of the invention, one electrode of the organic light emitting display portion is formed on one surface of the first substrate, one electrode of the liquid crystal display portion is formed on the other surface of the first substrate, the first Electrodes formed on both surfaces of the substrate may be provided as electrodes of a transparent material, and the organic electroluminescent display and the liquid crystal display may both implement an image in the direction of the liquid crystal display on the first substrate.

In this case, a circular polarizer may be further provided outside the liquid crystal display, and the organic light emitting display and the liquid crystal display may share the circular polarizer.

According to another feature of the invention, one electrode of the organic light emitting display portion is formed on one surface of the first substrate, one electrode of the liquid crystal display portion is formed on the other surface of the first substrate, the first The electrode of the organic light emitting display unit formed on one surface of the substrate is provided to reflect light introduced from the outside of the liquid crystal display unit, the electrode of the liquid crystal display formed on the other surface of the first substrate is provided as an electrode of a transparent material, The organic electroluminescent display and the liquid crystal display may be configured to implement images in opposite directions.

In this case, an electrode of the organic light emitting display unit formed on one surface of the first substrate may be provided as a transflective reflecting plate of the liquid crystal display unit.

According to another feature of the present invention, the organic light emitting film may include red, green, and blue pixels of a predetermined pattern.

According to another feature of the invention, the liquid crystal display may be a white light is projected.

In order to achieve the above object, the present invention also provides a first substrate of transparent material, first and second electrodes sequentially formed from the first substrate on one surface of the first substrate, and the first and second electrodes. An organic electroluminescent display including an organic light emitting film interposed therebetween, a third electrode formed on the other surface of the first substrate, and a fourth electrode disposed on the surface facing the third electrode and spaced apart from the third electrode by a predetermined distance. And a liquid crystal display unit comprising a second substrate having a second liquid crystal and a liquid crystal disposed between the third and fourth electrodes, and using the first electrode or the second electrode as a reflecting plate. Provided is an organic light emitting display device.

According to another feature of the invention, the first electrode, the third electrode and the fourth electrode is a transparent material electrode, the second electrode is provided to reflect light introduced from the outside of the second substrate, Both the organic electroluminescent display and the liquid crystal display may implement an image in an outward direction of the second substrate.

According to another feature of the invention, the second electrode, the third electrode and the fourth electrode is an electrode of a transparent material, the first electrode is provided to reflect light introduced from the outside of the second substrate, The organic light emitting display and the liquid crystal display may implement images in different directions.

In this case, the first electrode may be provided as a transflective plate of the liquid crystal display.

According to another feature of the present invention, a circular polarizer may be further provided on the opposite side of the second substrate on which the fourth electrode is formed.

According to another feature of the invention, the second substrate may be provided as a circular polarizing plate.

According to another feature of the present invention, the organic light emitting film may include red, green, and blue pixels of a predetermined pattern.

According to another feature of the invention, the liquid crystal display may be a white light is projected.

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

<Example 1>

1 illustrates an organic light emitting display device having a liquid crystal display according to a first embodiment of the present invention.

As shown in FIG. 1, an organic light emitting display device having a liquid crystal display according to the present invention includes a first substrate 10 made of a transparent material and an organic electric field formed on one surface of the first substrate 10. The light emitting display unit 20 and the liquid crystal display unit 30 formed on the other surface are provided.

The organic electroluminescent display 20 is formed by sequentially forming a first electrode layer 21, an organic light emitting layer 22, and a second electrode layer 23 on one surface of a transparent first substrate 10. As shown in FIG. 1, the organic electroluminescent display 20 is sealed to the outside of the second electrode layer 23 to encapsulate the encapsulation structure so that water penetration from outside or invasion of air can be blocked. 24 may be further provided. This sealing structure 24 is mentioned later.

The first substrate 10 may be any material as long as it is a transparent material. Transparent glass or a plastic substrate may be used. Although not shown in the drawings, a buffer layer may be formed on both surfaces of the first substrate 10 by SiO _2, or the like, to block infiltration of impurities.

The first electrode layer 21 is formed on one surface of the first substrate 10 as described above. The first electrode layer 21 is transparent, such as indium tin oxide (ITO), according to a preferred embodiment of the present invention. It can be formed in a predetermined pattern using a conductive material of the material. After the first electrode layer 21 is formed in this way, an interlayer insulating film (not shown) for preventing a short circuit between the first electrode layer 21 and a short circuit between the first electrode layer 21 and the second electrode layer 23 to be formed later. And the like can be further formed.

After forming the first electrode layer 21 as described above, the organic light emitting film 22 is formed. The organic light emitting layer 22 may be any organic film that can be used in an organic light emitting display, and may be formed by stacking a hole transport layer, an electron transport layer, etc. in a single or composite structure around the organic light emitting layer. In addition, usable organic materials include phthalocyanine (CuPc: copper phthalocyanine), N, N-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine (N, N'-Di (naphthalene-1-yl) ) -N, N'-diphenyl-benzidine (NPB), tris-8-hydroxyquinoline aluminum (Alq3) and the like can be applied in various ways. The organic light emitting layer of the organic light emitting layer 22 includes red, green, and blue pixels so that full color can be realized. In this case, each pixel has a predetermined pattern.

In the upper portion of the first substrate 10 on which the organic light emitting film 22 is formed, that is, in FIG. 1, the second electrode layer 23 is formed again under the organic light emitting film 22. The second electrode layer 23 is preferably formed in a predetermined pattern in a direction crossing the first electrode layer 21. In addition, according to an exemplary embodiment of the present invention, the second electrode layer 23 may be used as a reflecting plate of the liquid crystal display unit 30 to be described later, and may reflect light flowing from the liquid crystal display unit 30 side. It may be formed of aluminum or an aluminum alloy so as not to be limited thereto, and a conductive metal layer such as magnesium silver alloy may be used. The second electrode layer 23 is preferably formed in a predetermined pattern so that the organic light emitting layer 22 is not damaged. For this purpose, a separate partition wall is formed of an insulating material or a direct pattern is formed using a deposition mask. It can be formed and deposited.

After all of the second electrode layers 23 are formed as described above, the sealing structure 24 may be formed as the outer layer. Although the sealing structure 24 is not shown, a metal cap incorporating a moisture absorbent may be used, and the sealing structure 24 may be configured to be sealed as a separate resin material. In addition, the sealing structure 24 may be formed of a transparent substrate provided with transparent glass or plastic.

Although not illustrated in the drawings, the organic light emitting display unit 20 formed on one surface of the first substrate 10 may be driven by a passive matrix, or may include a thin film transistor for each pixel. It may also be driven in an active matrix. The driving circuit unit for driving is not shown in the drawings for the convenience of description.

Meanwhile, a reflective liquid crystal display 30 is formed on the other surface of the first substrate 10. As the reflective liquid crystal display 30, a general reflective liquid crystal display 30 may be employed as it is.

That is, as shown in FIG. 1, the second electrode layer 32 having a predetermined pattern is formed on the other surface of the first substrate 10, and the second electrode spaced apart from the other surface of the first substrate 10 by a predetermined distance. The fourth electrode layer 33 is formed on the surface of the substrate 31 facing the third electrode layer 32, and the liquid crystal 34 is disposed between the first substrate 10 and the second substrate 31. Structure. Although not shown in the drawings, the liquid crystal display further includes an alignment layer.

The third electrode layer 32 and the fourth electrode layer 33 are preferably formed of a conductive material made of a transparent material for light transmission. According to an exemplary embodiment of the present invention, the third electrode layer 32 and the fourth electrode layer 33 may be formed of ITO. In addition, the second substrate 31 may use a glass or plastic substrate made of a transparent material. On the outer surface of the second substrate 31 is further attached a circular polarizing plate 35 for blocking the reflected light. The circular polarizing plate 35 is commonly applied to the liquid crystal display unit 30 and the organic electroluminescent display unit 20, and functions to block reflection of external light.

The liquid crystal 34 disposed between the third electrode layer 32 and the fourth electrode layer 33 may be any common liquid crystal layer, but according to a preferred embodiment of the present invention, a twisted nematic liquid crystal, etc. However, the present invention is not limited thereto, and any liquid crystal material usable in the liquid crystal display may be applied.

In the present invention, the liquid crystal display unit 30 as described above may be driven as a reflective liquid crystal display unit 30 that does not require a separate lighting device such as a backlight. As described above, the organic light emitting display unit 20 may be used. Can be used as the reflecting plate. In addition, the liquid crystal display 30 may be a white normal type in which white light having a higher light transmittance is projected.

In the above liquid crystal display unit, a driving circuit for realizing the image is not illustrated for convenience of description, and a control unit for controlling driving of the organic light emitting display unit and the liquid crystal display unit is not illustrated.

Next, the operation of the organic light emitting display device having the liquid crystal display unit having the above configuration will be described.

The liquid crystal display unit 30 is a voltage driving method, and the organic light emitting display unit 20 is a current driving method. The liquid crystal display 30 and the organic electroluminescent display 20 both display a screen in the direction of the arrow of FIG. 1.

As described above, since the liquid crystal display 30 uses the second electrode layer 23 of the organic light emitting display 20 as a reflecting plate, the liquid crystal display 30 may be driven even when the organic light emitting display 20 is not driven. In other words, when the external light is sufficient and during daytime, or when it should be always on for display such as a simple date and time, only the liquid crystal display 30 is driven, and the organic electroluminescent display 20 is not driven. It is possible to prevent unnecessary waste of power. In this case, the liquid crystal display 30 uses a screen reflected by external light by using the second electrode layer 23 of the organic electroluminescent display 20 as a reflecting plate. Since the liquid crystal display unit 30 consumes only a few mW of power, the liquid crystal display unit 30 can be driven at all times, and in this case, the power consumption is significantly reduced compared to the case where the organic electroluminescent display unit 20 is driven at all times. can do.

Meanwhile, the organic light emitting display 20 may be driven regardless of whether the liquid crystal display 30 is driven or not, and the organic light emitting diode is disposed between the first electrode layer 21 and the second electrode layer 23. The film 22 can self-luminous to realize a full color image.

Therefore, when the organic light emitting display device having the reflective liquid crystal display unit is used, the reflective liquid crystal display unit 30 is used to display a simple screen that should always be displayed, such as time or date, and the organic electroluminescent display. The display unit 20 can be used to display a video screen or other desired full color screen, thereby preventing the waste of power consumption caused by the organic electroluminescent display 20 being driven at all times.

<Example 2>

2 illustrates an organic light emitting display device having a liquid crystal display according to a second exemplary embodiment of the present invention.

Since the basic configuration of the organic light emitting display device having the liquid crystal display as shown in FIG. 2 is the same as that of the first embodiment described above, the same reference numerals are used for the same components.

As shown in FIG. 2, in the second embodiment of the present invention, an organic electroluminescence display 20 ′ is formed on one surface of the first substrate 10 as in the first embodiment, and the liquid crystal display 30 is formed on the other surface. ) Is formed. As shown in the figure, the organic electroluminescent display 20 'and the liquid crystal display 30 share a first substrate 10, and one surface of the first substrate 10 has an organic electroluminescent display 20'. The first electrode layer 21 ′, which is an electrode layer, is formed, and the third electrode layer 32 of the liquid crystal display unit 30 is formed on the other surface. In the following, the same configuration as that of the first embodiment described above will be omitted, and the difference will be mainly described.

In the present exemplary embodiment, the organic electroluminescent display 20 'formed on one surface of the first substrate 10 has a first electrode layer 21' formed of a reflective material on one surface of the first substrate 10. The organic light emitting film 22 and the second electrode layer 22 'are sequentially formed. In this case, the first electrode layer 21 'is preferably formed of aluminum or an aluminum alloy so as to reflect external light, and the second electrode layer 23' is preferably formed of a transparent electrode layer such as ITO. Of course, the first and second electrode layers 21 'and 23' are preferably formed to intersect in a predetermined pattern, and the organic light emission is performed at the portions where the first and second electrode layers 21 'and 23' intersect. The film 22 emits light to produce a predetermined image. Since the organic light emitting film 22 is the same as in the first embodiment, the description thereof is omitted. Also, in the present exemplary embodiment, the organic light emitting display unit 20 ′ may include a thin film transistor (not shown) for each pixel. Further, a sealing structure 24 'is further provided outside the second electrode layer 23'. At this time, unlike the sealing structure of the first embodiment described above, the sealing structure 24 'should be provided with a transparent substrate such as a transparent substrate such as glass or plastic or a transparent layer such as a sealing layer provided with a resin material of transparent material. It is preferable that the circularly polarizing plate 25 is further provided on the outside to block the reflected light to improve the contrast.

On the other hand, the liquid crystal display 30 formed on the other surface of the first substrate 10 uses the first electrode layer 21 'of the organic electroluminescent display 20' as the reflecting plate, and the configuration thereof is described above. Since it is the same as that of the first embodiment, the description thereof is omitted.

As shown in FIG. 2, the organic light emitting display device having the liquid crystal display unit having the above structure has a structure that emits light on both sides. That is, the organic electroluminescent display 20 'formed on one surface of the first substrate 10 implements an image in the direction in which the second electrode layer 23' is formed, and the liquid crystal display formed on the other surface of the first substrate 10. 30 implements an image in the direction of the second substrate 31.

Therefore, such a display device can be used for a dual type display device such as a dual folding portable telephone which is widely used in recent years. In this case, since the liquid crystal display 30 is operated by external light, the LCD 30 is operated as an auxiliary screen that is always displayed, such as time or date, and the organic electroluminescent display 20 'is operated as a main screen. can do. Therefore, in the folder type display device, only the liquid crystal display unit 30, which usually consumes less power, is driven, and when the folder is opened to operate the main screen, the organic electroluminescence display unit 20 'is driven to provide a desired predetermined value. You can make the image visible. By using the liquid crystal display unit 30 using the reflecting plate as an auxiliary screen in the folder type display device as described above, it is usually used with the minimum power consumption, and the desired image can be viewed as the organic electroluminescent display unit 20 '. Can be minimized.

On the other hand, in such a double-sided light emitting display device, not only the liquid crystal display unit 30 is used as a reflective liquid crystal display unit which can see an image by external light but also the first electrode layer 21 'is used as a transflective plate. It can be used as a transflective liquid crystal display. That is, even when the image is viewed only by the liquid crystal display 30, the organic electroluminescent display 20 ′ may be driven to implement the image using the light. In this case, even when the liquid crystal display 30 is used as a semi-transmissive type, the organic electroluminescent display 20 'is not always driven, so the waste of power consumption can be minimized.

<Example 3>

3 illustrates an organic light emitting display device having a liquid crystal display according to a third exemplary embodiment of the present invention.

The organic electroluminescent display having the liquid crystal display according to the third embodiment of the present invention shown in FIG. 3 has the same basic configuration as that of the first embodiment of the present invention shown in FIG. The description thereof is omitted.

Referring to FIG. 3, an organic light emitting display device having a liquid crystal display according to a third exemplary embodiment of the present invention uses a polymer substrate that blocks reflected light as the second substrate 36. As shown in a partially enlarged view of FIG. 3, the second substrate 36 may be provided with a circular polarizing plate 360 and a protective sheet 363.

The circular polarizing plate 360 has a linear polarizing plate 361 selectively passing only light traveling in the x or y direction, and a quarter wavelength for circularly polarizing the light passing through the linear polarizing plate 361 in a predetermined direction. It is provided with a phase difference plate 362. The two optical axes of the 1/4 wavelength retardation plate 362 are formed to form a 45 degree angle with the polarization axis of the linear polarizing plate 361. Therefore, when unpolarized external light first passes through the linear polarizing plate 361, the polarization of the transmitted light becomes an angle of 45 degrees with the optical axis of the quarter-wave retardation plate 362. As the light passes through the quarter-wave retardation plate 362, the electric field vibration of the light becomes circularly polarized light, and when the circularly polarized light is reflected by the first electrode layer 21, which is the reflecting plate, the polarization direction of the circularly polarized light is reversed. If the reflected light passes through the 1/4 wavelength retardation plate 362 again, linear polarization is performed again, but the polarization direction is perpendicular to the polarization axis of the linear polarization plate 361 and thus cannot penetrate the linear polarization plate 361. The reflection to the outside of the second substrate 36 is blocked. After the circular polarizing plate 360 is formed, a protective sheet is formed on the surface of the linear polarizing plate 361 and the surface of the quarter-wave retardation plate 362 to maintain the strength as a substrate and to protect the circular polarizing plate 360. Each one of the fields 363 is attached.

As described above, the circularly polarizing plate itself is used as the substrate instead of the circularly polarizing plate attached to a separate substrate, thereby reducing the thickness of the entire display device. The circular polarizing plate 360 may be used as the circular polarizing plate 35 of the first and second embodiments described with reference to FIGS. 1 and 2, respectively. In this case, the second substrate to which the circular polarizing plate 360 is attached may be an isotropic substrate.

As described above, the second substrate provided as the circular polarizing plate may be provided as another embodiment. That is, the second substrate 36 as shown in FIG. 4 attaches protective sheets 363 to both surfaces of the linear polarizing plate 361, and the linear polarizing plate 361 to which the protective sheet 363 is attached. The 1/4 wavelength retardation plate 362 is attached to one surface of the.

Fourth Embodiment

FIG. 5 illustrates an organic electroluminescent display having a liquid crystal display according to a fourth preferred embodiment of the present invention. As shown in FIG. 5, the basic configuration thereof is the second preferred embodiment of the present invention according to FIG. Since it is the same as the example, description of the component is abbreviate | omitted.

Referring to FIG. 5, an organic light emitting display device having a liquid crystal display according to a fourth exemplary embodiment of the present invention uses a polymer substrate that blocks reflected light as the second substrate 36. As shown in the partial enlarged view of FIG. 5, the second substrate 36 may be provided with a circular polarizing plate 360 and a protective sheet 363, which is the third embodiment of the present invention according to FIG. 3. Since it is the same as the case of an Example, the detailed description is abbreviate | omitted. According to the present invention, the second substrate 36 may also use a structure as shown in FIG.

As described above, since the organic light emitting display device is a double-sided light emission type around the first substrate 10, the liquid crystal display 30 ′ and the organic electroluminescent display 20 ′ respectively implement images in different directions. Done. Therefore, the circularly polarizing film should be attached to the outer surface of the sealing structure provided to the outside of the second electrode layer 23 ', and the sealing substrate 26 including the sealing structure and the circularly polarizing film as the circular polarizing film is described above. Can also be used. That is, as shown in a partially enlarged view of FIG. 5, the circularly polarizing plate 260 having the protective sheets 263 is used as the sealing substrate 26 provided outside the second electrode layer 23 ′. In this case, even when the organic light emitting display 20 'is driven, the reflection to external light can be lowered to improve contrast. Although not shown in the figure, the sealing substrate 26 may be provided such that the protective sheets are attached to both sides of the linear polarizing plate and a quarter-wave retardation plate is attached to the inner side as shown in FIG. 4.

According to the organic electroluminescent display provided with the liquid crystal display of the present invention as described above, the following effects can be obtained.

First, by utilizing the advantages of the liquid crystal display and the organic electroluminescent display, it is possible to reduce unnecessary power consumption by using a liquid crystal display having a relatively small power consumption in the case of not requiring a special image.

Second, the liquid crystal display and the organic electroluminescent display share a single substrate and / or a polarizing plate, and the thickness of the organic electroluminescent display is reduced by using one electrode as the reflective plate of the liquid crystal display. Can be.

Third, even when the image is implemented in one direction, the low power consumption of the liquid crystal display device may be used, and the fast response characteristic of the organic light emitting display device may be simultaneously used, and the thickness thereof may also be minimized.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (16)

A first substrate of transparent material; An organic light emitting display unit formed on one surface of the first substrate and including an organic light emitting layer formed between two electrodes disposed to face each other; And And a liquid crystal display formed on the other surface of the first substrate and including a liquid crystal between two electrodes disposed to face each other, and using any one electrode of the organic light emitting display as a reflecting plate. An organic light emitting display device comprising a liquid crystal display unit. The method of claim 1, The organic electroluminescent display device having a liquid crystal display unit, wherein the organic electroluminescent display unit and the liquid crystal display unit share the first substrate. The method of claim 2, One electrode of the organic light emitting display unit is formed on one surface of the first substrate, and one electrode of the liquid crystal display unit is formed on the other surface of the first substrate, and electrodes formed on both surfaces of the first substrate are transparent materials. 2. The organic light emitting display device having a liquid crystal display unit of claim 1, wherein both of the organic light emitting display unit and the liquid crystal display unit implement an image in a direction of the liquid crystal display unit on the first substrate. The method of claim 3, A circular polarizer is further provided outside the liquid crystal display, and the organic electroluminescent display and the liquid crystal display share the circular polarizer. The method of claim 2, One electrode of the organic light emitting display unit is formed on one surface of the first substrate, and one electrode of the liquid crystal display unit is formed on the other surface of the first substrate, and an organic electroluminescent display unit formed on one surface of the first substrate. The electrode of the liquid crystal display is provided to reflect light introduced from the outside, the electrode of the liquid crystal display formed on the other surface of the first substrate is provided with an electrode of a transparent material, the organic electroluminescent display and the liquid crystal display An organic light emitting display device having a liquid crystal display, characterized in that to implement an image in the opposite direction. The method of claim 5, The electrode of the organic light emitting display unit formed on one surface of the first substrate is provided with a transflective reflecting plate of the liquid crystal display unit. The method according to any one of claims 1 to 6, And the organic light emitting layer comprises red, green, and blue pixels having a predetermined pattern. The method according to any one of claims 1 to 6, The organic light emitting display device having a liquid crystal display unit, wherein the liquid crystal display unit projects white light. A first substrate of transparent material; An organic electroluminescent display including a first electrode and a second electrode sequentially formed from the first substrate on one surface of the first substrate, and an organic light emitting layer provided between the first and second electrodes; And A third electrode formed on the other surface of the first substrate, a second substrate provided to be spaced apart from the third electrode by a predetermined distance and having a fourth electrode on a surface facing the third electrode, and the third and fourth electrodes An organic electroluminescent display device having a liquid crystal display, comprising: a liquid crystal display unit including a liquid crystal disposed between the liquid crystal display unit using the first electrode or the second electrode as a reflecting plate. The method of claim 9, The first electrode, the third electrode, and the fourth electrode are electrodes of a transparent material, and the second electrode is provided to reflect light introduced from the outside of the second substrate. The organic light emitting display unit and the liquid crystal display unit All of the organic light emitting display device having a liquid crystal display, characterized in that to implement the image in the outward direction of the second substrate. The method of claim 9, The second electrode, the third electrode, and the fourth electrode are electrodes of a transparent material, and the first electrode is provided to reflect light introduced from the outside of the second substrate, and the organic light emitting display and the liquid crystal display are An organic light emitting display device having a liquid crystal display, characterized in that to implement an image in different directions. The method of claim 11, And the first electrode is a semi-transmissive reflector of the liquid crystal display. The method of claim 9, And a circularly polarizing plate on the opposite side of the second substrate where the fourth electrode is formed. The method of claim 9, The second substrate is an organic electroluminescent display device having a liquid crystal display, characterized in that provided as a circular polarizing plate. The method according to any one of claims 9 to 14, And the organic light emitting layer comprises red, green, and blue pixels having a predetermined pattern. The method according to any one of claims 9 to 14, The organic light emitting display device having a liquid crystal display unit, wherein the liquid crystal display unit projects white light.