KR20150078392A - Organic light emitting diode display device and fabricating method of the same - Google Patents

Abstract

Disclosed are an organic electroluminescent display device and a manufacturing method thereof. The organic electroluminescent display device of the present invention comprises: a substrate including a plurality of pixel areas; a thin film transistor formed on each of the pixel areas; a first flattening film formed on the thin film transistor; a reflected layer formed on the flattening film; an organic light emitting device which is formed on the reflected layer and emits light by including a first electrode, an organic light emitting layer, and a second electrode; and a color filter formed between the reflected layer and the organic light emitting device. Therefore, the organic electroluminescent display device and the manufacturing method thereof according to the present invention can prevent external light reflection by forming the color filter on a reflected plate and increase a light emitting efficiency and improve brightness. Moreover, the process can be simplified by omitting the process to bond a color filter substrate to the outside by including the color filter in the inner side. There is no necessity for considering a process margin. Misalignment can be prevented and the thickness can be reduced. Furthermore, the present invention can be applied to a transparent flexible organic electroluminescent display device and offers an advantage to high resolution applications.

Description

[0001] The present invention relates to an organic electroluminescent display device,

The present invention relates to an organic light emitting display device and a method of manufacturing the same, and more particularly, to an organic light emitting display device capable of preventing external light reflection, improving brightness, preventing mis- And a manufacturing method thereof.

In recent years, as the information age has come to a full-fledged information age, a display field for visually expressing electrical information signals has been rapidly developed. In response to this, various flat panel display devices having excellent performance of thinning, light weight, Flat Display Device) has been developed to replace CRT (Cathode Ray Tube).

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), an organic light emitting display (OLED), an electrophoretic display (EPD) A plasma display panel (PDP), a field emission display (FED), an electroluminescence display (ELD), and an electro-wetting display (EWD) And the like. In general, a flat panel display panel, which realizes images, is an essential component. The flat panel display panel includes a pair of substrates bonded together with an intrinsic light emitting material or a polarizing material layer therebetween.

Since an organic light emitting diode (OLED) display device, which is one of such flat panel display devices, includes an organic light emitting element that is a self light emitting element, a separate light source used in a liquid crystal display It is lightweight and thin. In addition, it has superior viewing angle and contrast ratio compared with liquid crystal display devices, is advantageous in terms of power consumption, can be driven by DC low voltage, has a quick response speed, is resistant to external impacts due to its solid internal components, It has advantages.

The organic light emitting diode is a device for emitting light by depositing an organic light emitting layer formed of an organic material between an anode made of ITO or the like and a cathode made of aluminum or the like on a glass substrate and applying an electric field thereto. When a voltage is applied between the anode and the cathode of the organic light emitting diode, holes are injected from the anode, electrons are injected from the cathode, and then excitons are generated in the light emitting layer through migration. The organic light emitting display may use light emitted when the generated excitons fall to a ground state.

At this time, the conventional organic light emitting display device includes at least one electrode capable of reflecting light, and has a problem of reflecting light incident from the outside. Therefore, it is difficult to realize black due to reflection of external light, and the contrast is lowered. In order to solve such a problem, a conventional organic light emitting display device arranges a polarizing plate to prevent external light from being reflected.

1 is a view illustrating a conventional organic light emitting display device including a polarizing plate.

1, a semiconductor device includes an element layer 11 including an insulating substrate 10 and an element such as a thin film transistor formed on the substrate 10 and a planarization layer 12 formed on the element layer 11 The element substrate S is formed. An organic light emitting diode OL including a first electrode 14, an organic light emitting layer 15 and a second electrode 16 is formed on the device substrate S. A reflection plate 13 is formed between the organic light emitting device OL and the device substrate S to allow light to be emitted from the organic light emitting device OL to the front surface. A sealing layer 17 is formed on the organic light emitting diode OL to protect the organic light emitting diode OL from oxygen and moisture and a polarizing plate 18 is formed on the sealing layer 17.

At this time, the polarizing plate 18 generally has a transmittance of 40 to 45%, blocking the reflection of external light, and reducing light emitted to the front surface of the organic light emitting diode OL, thereby lowering the luminous efficiency.

2. Description of the Related Art In recent years, display devices have been actively developed, so that diversity is required different from existing designs, display devices capable of enhancing aesthetic functions, and capable of providing various functions in use are being discussed. As an example, a transparent organic electroluminescent display device is under development. The transparent organic light emitting display device must transmit light in a region except a pixel region to maintain transparency.

However, when the organic light emitting display device including the polarizing plate 18 is applied to a transparent organic light emitting display device, transparency is reduced. To improve this, a structure for forming a color filter substrate on an organic light emitting display instead of a polarizing plate has been proposed.

2 is a view showing a conventional organic light emitting display device including a color filter substrate.

Referring to FIG. 2, the organic light emitting device OL is formed on the element substrate S with the reflection plate 23 interposed therebetween. The device substrate S includes an insulating substrate 20 and an element layer 21 including elements such as thin film transistors formed on the substrate 20 and a planarization film 22 formed on the element layer 21 do. The organic light emitting diode OL includes a first electrode 24, an organic light emitting layer 25, and a second electrode 26. An encapsulation layer 27 is formed on the organic light emitting diode OL to protect the organic light emitting diode OL.

And a color filter substrate C is adhered and formed on the sealing layer 27. The color filter substrate (C) has a color filter (31) and a black matrix (32) formed on a glass substrate (30). The color filter substrate C is provided with color filters 31 so as to correspond to the respective pixel regions and black matrices 32 are arranged so as to correspond to the pixel regions and are then bonded onto the sealing layer 27. At this time, an ultraviolet ray shielding film 28 may be further formed on the back surface of the glass substrate 30 of the color filter substrate C.

Accordingly, the light of each pixel region emitted from the OLED OL can be emitted to the outside without passing through the color filter 31 instead of the polarizer. In addition, the external light reflectance can be reduced to about 30%. In addition, when applied to a transparent organic electroluminescence display device, transparency does not decrease in a region excluding a pixel region.

However, a conventional organic light emitting display device including a color filter substrate may cause misalignment in the color filter substrate bonding process. This is detrimental to high resolution applications. Further, when misalignment occurs, there is a problem that the transmissive region is obscured or the contrast due to exposure of the reflective electrode is lowered. In addition, when the color of the pixel region and the color filter do not match, a problem arises in that color mixing occurs and the luminance is lowered.

In addition, a conventional organic light emitting display device including a color filter substrate is greatly increased in thickness by a glass substrate or the like, and it is difficult to manufacture a thin organic light emitting display device. In addition, since a glass substrate is included and the thickness is too thick, it is difficult to apply to a flexible organic electroluminescence display device.

An object of the present invention is to provide an organic electroluminescence display device and a method of manufacturing the same that can prevent reflection of external light, increase luminous efficiency, and improve brightness by forming a color filter on a reflection plate.

Further, according to the present invention, by including the color filter in the inside, the process for attaching the color filter substrate to the outside can be omitted, the process is simplified, the process margin is not required to be considered, misalignment is prevented, And a method of manufacturing the same.

It is another object of the present invention to provide an organic light emitting display device which is applicable to a transparent flexible organic light emitting display device and is advantageous for high resolution application and a method of manufacturing the same.

According to an aspect of the present invention, there is provided an organic light emitting display including: a substrate including a plurality of pixel regions; A thin film transistor formed on each of the pixel regions on the substrate; A first planarization film formed on the thin film transistor; A reflective layer formed on the first planarization layer; An organic light emitting element formed on the reflective layer and including a first electrode, an organic light emitting layer, and a second electrode to emit light; And a color filter formed between the reflective layer and the organic light emitting device.

According to another aspect of the present invention, there is provided a method of manufacturing an organic light emitting display, including: forming a thin film transistor in each pixel region on a substrate including a plurality of pixel regions; Forming a first planarization film on the thin film transistor; Forming a reflective layer on the first planarization layer; Forming a color filter on the reflective layer; Forming a second planarization film on the color filter; And forming an organic light emitting device including a first electrode, an organic light emitting layer, and a second electrode on the second planarization layer and emitting light.

The organic electroluminescence display device and the method of manufacturing the same according to the present invention have the first effect of preventing reflection of external light, increasing the luminous efficiency, and improving the luminance by forming the color filter on the reflection plate.

In addition, the organic light emitting display device and the method of manufacturing the same according to the present invention can simplify the process by omitting the step of attaching the color filter substrate to the outside by including the color filter therein, and there is no need to consider the process margin , There is a second effect that misalignment is prevented and the thickness can be reduced.

The organic electroluminescent display device and the method of manufacturing the same according to the present invention can be applied to a transparent flexible organic electroluminescent display device and have a third advantageous effect in high resolution application.

1 is a view illustrating a conventional organic light emitting display device including a polarizing plate.
2 is a view showing a conventional organic light emitting display device including a color filter substrate.
3 is a view illustrating an organic light emitting display device according to the present invention.
4A to 4G are views showing a method of manufacturing an organic light emitting display device according to the present invention.
5A and 5B are diagrams illustrating a simulation of the light emitting efficiency of the conventional invention and the present invention.
FIG. 6 is a diagram showing the luminance improvement of the present invention in comparison with the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

3 is a view illustrating an organic light emitting display device according to the present invention.

Referring to FIG. 3, the organic light emitting display includes an element substrate S including an insulating substrate 100, an element layer 110, and a first planarization layer 120. The element layer 110 is formed with a plurality of thin film layers and electrical elements. And more particularly, a thin film transistor including a gate electrode, a semiconductor layer, a source electrode, and a drain electrode.

In the element layer 110, a gate line and a data line are formed to intersect with each other to define a pixel region. As a result, the substrate 100 includes a plurality of pixel regions. At least one thin film transistor is formed in each pixel region of the plurality of pixel regions. A first planarization layer 120 is formed on the element layer 110 including the thin film transistor.

A reflective layer 130 is formed on the first planarization layer 120 and a color filter 131 is formed on the reflective layer 130. A second planarization layer 132 is formed on the color filter 131. By forming the color filter 131 on the reflection layer 130, the reflectance of the external light can be reduced to about 30%.

The color filter 131 is formed in a color corresponding to a sub-pixel of a pixel region where the color filter 131 is formed. For example, when the sub-pixel in which the color filter 131 is formed is a red sub-pixel, the color filter 131 is formed of a red color filter. When the sub-pixel in which the color filter 131 is formed is a green sub-pixel, the color filter 131 is formed of a green color filter, and the sub-pixel in which the color filter 131 is formed is a blue sub- The color filter 131 is formed of a blue color filter. That is, the color filter 131 is formed in the same color as that of the light emitted by the OLED OL.

In the organic light emitting display device according to the present invention, the color filter 131 is formed on the reflective layer 130 and under the organic light emitting device, thereby reducing external light reflection and improving contrast. Also, unlike the conventional method of attaching the color filter substrate, the laminating process can be omitted, and the thickness can be reduced.

A separate glass substrate or the like is not required, and the present invention is also applicable to a flexible organic light emitting display device. In particular, when applied to a transparent organic electroluminescence display device, transparency can be ensured in a region excluding a pixel region, which is advantageous. The flexible organic light emitting display device refers to a display device in which the insulating substrate 100 is formed of a flexible material and can be bent or the like. The transparent organic electroluminescence display device refers to a display device that maintains transparency in a region excluding a pixel region.

In addition, the organic light emitting display according to the present invention does not need to consider a process margin due to omission of a laminating process, unlike the prior art, can prevent misalignment, and is advantageously applied to a high resolution. That is, it is possible to omit the polarizing plate or the color filter substrate formed on the organic light emitting element while blocking the reflection of the external light.

A second planarization layer 132 is formed on the color filter 131. The color filter 131 has a rough surface and a curvature occurs due to the color filter 131, and thus a second planarization film 132 is required. An organic light emitting diode OL having a first electrode 140, an organic light emitting layer 150, and a second electrode 160 stacked on the second planarization layer 132 is formed. When a voltage is applied to the first electrode 140 and the second electrode 160, the organic light emitting device OL moves the holes and electrons, and holes and electrons in the organic light emitting layer 150 meet to form an exciton. And emits light when the generated exciton falls to a ground state. At this time, the color of the light emitted from the organic light emitting diode OL and the color of the color filter 131 are formed to be the same.

An encapsulating layer 170 for blocking oxygen and moisture is formed on the OLED OL. Since the organic light emitting diode OL can easily cause defects in oxygen and moisture, the sealing layer 170 is required. Further, an ultraviolet blocking film 180 may be further formed on the sealing layer 170. The organic electroluminescent display device and the method of manufacturing the same according to the present invention will now be described in detail with reference to cross sectional views.

4A to 4G are views showing a method of manufacturing an organic light emitting display device according to the present invention.

Referring to FIG. 4A, a buffer layer 101 is formed on an entire surface of an insulating substrate 100 formed of glass, plastic, polyimide (PI) or the like. A semiconductor layer 102 is formed on the buffer layer 101. A gate electrode 104 is formed so as to overlap with the semiconductor layer 102 and the gate insulating film 103 therebetween. Although the gate insulating film 103 is formed only under the gate electrode 104 in the drawing, the gate insulating film 103 may be formed on the entire surface of the substrate 100.

The gate electrode 104 may be formed of an alloy formed from a combination of molybdenum (Mo), titanium (Ti), tantalum (Ta), tungsten (W), copper (Cu), chromium (Cr) It may be formed by laminating at least one of ITO, IZO and ITZO which are transparent conductive materials. However, the material is not limited to this, and it can be formed of a material of a gate electrode and a gate line which are generally used. Although the gate electrode 104 is formed of a single metal layer in the drawing, it is not fixed and can be formed by stacking two or more metal layers.

An interlayer insulating film 105 is formed on the entire surface of the substrate 100 on which the gate electrode 104 is formed. Thereafter, the interlayer insulating film 105 is etched by a photoresist process to form a contact hole for exposing the semiconductor layer 102. A source electrode 106 and a drain electrode 107 are formed on the interlayer insulating film 105 in which the contact hole is formed. A protective layer 108 is formed on the entire surface of the substrate 100 on which the source electrode 106 and the drain electrode 107 are formed.

The source electrode 106 and the drain electrode 107 may be formed of a metal such as molybdenum (Mo), titanium (Ti), tantalum (Ta), tungsten (W), copper (Cu), chromium (Cr) Can be formed by using any one of alloys formed from combinations. In addition, a transparent conductive material such as indium tin oxide (ITO) may be used. In the drawings, a single metal layer is formed, but in some cases, at least two or more metal layers may be stacked. However, the present invention is not limited thereto.

A thin film transistor including the semiconductor layer 102, the gate electrode 104, the source electrode 106 and the drain electrode 107 is formed and the element layer 110 including the thin film transistor is completed. Although not shown in the figure, the device layer 110 may further include a gate line and a data line which intersect with each other to define a pixel region. A plurality of pixel regions are formed on the substrate 100, and at least one thin film transistor is formed in each pixel region.

A first planarization layer 120 is formed on the device layer 110. A first contact hole exposing the drain electrode 107 and the first planarization layer 120 and the protective layer 108 may be formed to connect the drain electrode 107 and the first electrode formed in a subsequent process. . Thus, the element substrate S including the substrate 100, the element layer 110 including the thin film transistor formed on the substrate 100, and the first planarization film 120 is completed as described above.

However, the drawings only show the element substrate including the thin film transistor according to the present invention, and the present invention is not limited thereto. That is, the thin film transistor is represented by one thin film transistor in the drawing, but the thin film transistor may be composed of one or more thin film transistor combinations depending on the characteristics of the operation, and is not limited to the representation of the drawings. In addition, the configuration and the like of the thin film transistor can be variously modified and modified within a range not departing from the technical idea of the present invention. In addition, the organic light emitting display device may be variously modified in the structure of an element substrate formed under the organic light emitting element of the organic light emitting display device.

Referring to FIG. 4B, a reflective layer 130 is formed on the element substrate S on which the first contact hole is formed. The reflective layer 130 is formed of a metal material having a high reflectance such as aluminum (Al). However, the present invention is not limited thereto and may be formed of a material capable of reflecting light emitted from the organic light emitting device to the outside.

The reflective layer 130 is formed on the first contact hole exposing the drain electrode 107. That is, the reflective layer 130 is formed in contact with the drain electrode 107 through the first contact hole. Accordingly, the reflective layer 130 can prevent the drain electrode 107 from being damaged in the process of forming the second contact hole for contacting the drain electrode 107 and the first electrode of the organic light emitting device in a subsequent process have.

Referring to FIG. 4C, a color filter 131 is formed on the reflective layer 130. The color filter 131 is formed in a color corresponding to a sub-pixel of a pixel region where the color filter 131 is formed. For example, when the sub-pixel in which the color filter 131 is formed is a red sub-pixel, the color filter 131 is formed of a red color filter. When the sub-pixel in which the color filter 131 is formed is a green sub-pixel, the color filter 131 is formed of a green color filter, and the sub-pixel in which the color filter 131 is formed is a blue sub- The color filter 131 is formed of a blue color filter. That is, the color filter 131 is formed in the same color as the color of the light emitted by the organic light emitting device formed in a subsequent process.

A conventional organic electroluminescent display device has been added with a process of attaching a color filter substrate on an organic light emitting element to use a color filter in place of a polarizing plate. As a result, a process is added to increase the time and cost in the process, and the thickness increases due to the glass substrate of the color filter substrate and the like. In addition, the color filter substrate is thick and has a glass substrate or the like, which is difficult to apply to a flexible organic light emitting display device.

In addition, the OLED display device may miss-align the color filter and the pixel area during the laminating process. If misalignment occurs, the transmissive area may be obscured or the reflective electrode may be exposed. Defects such that the contrast was lowered occurred. Further, when the color of the pixel region and the color filter do not match, color mixing occurs and the luminance is lowered.

In the organic light emitting display device according to the present invention, the color filter 131 is formed on the reflective layer 130 and under the organic light emitting device, thereby reducing external light reflection and improving contrast. Also, unlike the conventional method of attaching the color filter substrate, the laminating process can be omitted, and the thickness can be reduced.

A separate glass substrate or the like is not required, and the present invention is also applicable to a flexible organic light emitting display device. In particular, when applied to a transparent organic electroluminescence display device, transparency can be ensured in a region excluding a pixel region, which is advantageous. The flexible organic light emitting display device refers to a display device in which the insulating substrate 100 is formed of a flexible material and can be bent or the like. The transparent organic electroluminescence display device refers to a display device that maintains transparency in a region excluding a pixel region.

In addition, the organic light emitting display according to the present invention does not need to consider a process margin due to omission of a laminating process, unlike the prior art, can prevent misalignment, and is advantageously applied to a high resolution. That is, it is possible to omit the polarizing plate or the color filter substrate formed on the organic light emitting element while blocking the reflection of the external light.

Referring to FIG. 4D, a second planarization layer 132 is formed on the entire surface of the substrate including the color filter 131. The color filter 131 has a rough surface and a curvature occurs due to the color filter 131, and thus a second planarization film 132 is required. Then, the second planarization layer 132 is etched to form a second contact hole in a region corresponding to the first contact hole. As the reflective layer 130 is formed on the first contact hole, the second contact hole is formed to expose the reflective layer 130.

The second contact hole is formed to connect the first electrode of the organic light emitting diode and the drain electrode 107 in a subsequent process. The step of forming the second contact hole in the second planarization layer 132 may be a wet etching process. At this time, the drain electrode 107 may be damaged due to the etching process. Accordingly, the reflective layer 130 is formed on the first contact hole exposing the drain electrode 107, a second contact hole is formed in the region corresponding to the first contact hole, May be formed to expose the reflective layer 130.

Referring to FIG. 4E, the organic light emitting diode OL is formed on the second planarization layer 132 having the second contact holes. The organic light emitting device OL includes a first electrode 140, an organic light emitting layer 150, and a second electrode 160.

The first electrode 140 is formed on the second contact hole. That is, the first electrode 140 is formed to be connected to the drain electrode 107 with the reflective layer 130 interposed therebetween. And may be formed of a transparent conductive material such as ITO. However, the material is not limited to ITO, and a material which can be generally formed by the first electrode is sufficient.

On the first electrode 140, a bank pattern 141 defining a light emitting region and a non-light emitting region is formed. The bank pattern 141 is formed to expose the first electrode 140 only in the light emitting region. The organic light emitting layer 150 is formed on the first electrode 140 exposed through the bank pattern 141. The organic light emitting layer 150 may be formed of a single layer of a light emitting material or may include a hole injection layer, a hole transporting layer, an emitting material layer, and an electron transporting layer an electron transporting layer, and an electron injection layer. A second electrode 160 is formed on the organic light emitting layer 150.

At this time, the second electrode 160 may be formed of IZO. When light is incident on the organic light emitting display device from the outside, reflection may also occur at the second electrode 160. In order to prevent this, the second electrode 160 may be formed of a material having a reflectance of 10% or less, for example, IZO. Thus, reflection of external light can be prevented.

Referring to FIG. 4F, a sealing layer 170 for blocking oxygen and moisture is formed on the OLED OL. Since the organic light emitting diode OL can easily cause defects in oxygen and moisture, the sealing layer 170 is required. The sealing layer 170 may be formed of a plurality of layers and may include a moisture absorbent. However, the present invention is not limited thereto, and generally, the organic light emitting diode OL may be sealed.

An ultraviolet blocking film 180 may be further formed on the sealing layer 170. If the polarizing plate is omitted, a transparent ultraviolet blocking film 180 may be additionally formed to block ultraviolet rays that may affect the device.

The organic light emitting display device according to the present invention can increase the light emitting efficiency of light emitted from the organic light emitting device in addition to the effect of blocking external light. This will be described below with reference to the drawings.

5A and 5B are diagrams illustrating a simulation of the light emitting efficiency of the conventional invention and the present invention.

FIG. 5A is a simulation result of a light emitting efficiency of a conventional organic light emitting display device including a color filter substrate, and FIG. 5B is a simulation result of an organic light emitting display device according to the present invention. 50% of light is emitted from the upper and lower surfaces of the organic light emitting device, the reflectance of the reflective layer 23 and 130 is 100%, the transmittance of the organic light emitting device OL is 100%, and the transmittance of the color filters 31 and 131 is 80% I suppose.

5A, in the conventional organic light emitting display, 50% of the light emitted from the organic light emitting diode OL is directed to the color filter 31 and 50% is directed to the reflection layer 23. Light directed toward the color filter 31 is transmitted through the color filter 31 and emitted as 40% of light. Light directed toward the reflective layer 23 passes through the organic light emitting device OL and is transmitted through the color filter 31 to be emitted as 40% of light. As a result, it can be seen that light emitted from the organic light emitting device of the conventional organic light emitting display device is emitted at 80%.

Referring to FIG. 5B, in the organic light emitting display according to the present invention, 50% of the light emitted from the organic light emitting diode OL is directly emitted to the outside, and 50% is directed to the color filter 131. Light directed toward the color filter 131 passes through the color filter 31 and is directed to the reflective layer 130 with 40% of the light. The light reflected by the reflective layer 130 passes through the color filter again, passes through the organic light emitting diode OL with 32% light, and is emitted to the outside. As a result, it can be seen that the light emitted from the organic light emitting diode of the organic light emitting display according to the present invention is emitted at 82%. Therefore, the organic light emitting display according to the present invention can further improve the luminous efficiency of light emitted from the organic light emitting device than the conventional organic light emitting display.

FIG. 6 is a diagram showing the luminance improvement of the present invention in comparison with the prior art.

Referring to FIG. 6, the red spectrum of the present invention is improved by 14.6% compared to that of the conventional red spectrum, the green spectrum of the present invention is improved by 19.5% than the green spectrum of the conventional invention, It can be seen that the luminance is improved by 15.1% than the blue spectrum of the conventional invention. 6 means a conventional organic light emitting display device including a color filter substrate.

That is, the organic light emitting display according to the present invention has a luminance of about 16.4% as compared with the related art.

Accordingly, the organic light emitting display device and the method of manufacturing the same according to the present invention can prevent reflection of external light, increase luminous efficiency, and improve brightness by forming a color filter on a reflection plate. Further, by including the color filter in the inside, omission of the process for attaching the color filter substrate to the outside can simplify the process, eliminate the need of consideration of the process margin, prevent mis-alignment, and reduce the thickness. Further, the present invention is applicable to a transparent flexible organic light emitting display device, and is advantageous for high resolution application.

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

100: insulating substrate 140: first electrode
110: element layer 150: organic light emitting layer
120: first planarization layer 160: second electrode
130: reflective layer 170: sealing layer
131: Color filter 180: UV protection film
132: second planarizing film

Claims (19)

1. A liquid crystal display comprising: a substrate comprising a plurality of pixel regions;
A thin film transistor formed on each of the pixel regions on the substrate;
A first planarization film formed on the thin film transistor;
A reflective layer formed on the first planarization layer;
An organic light emitting element formed on the reflective layer and including a first electrode, an organic light emitting layer, and a second electrode to emit light; And
And a color filter formed between the reflective layer and the organic light emitting device.
The method according to claim 1,
And the second electrode is IZO.
The method according to claim 1,
An encapsulation layer formed on the organic light emitting device; And
And an ultraviolet blocking film formed on the sealing layer.
The method according to claim 1,
Wherein the color filter is formed in the same color as that of light emitted from the organic light emitting diode.
The method according to claim 1,
And a second planarizing film formed on the color filter,
And a first electrode is formed on the second planarization layer.
6. The method of claim 5,
Wherein the first planarizing film includes a first contact hole exposing a drain electrode of the thin film transistor,
And the reflective layer is formed on the first contact hole.
The method according to claim 6,
And the second planarization layer includes a second contact hole exposing the reflective layer in a region corresponding to the first contact hole.
8. The method of claim 7,
Wherein the first electrode is connected to the drain electrode of the thin film transistor with the reflective layer interposed therebetween.
The method according to claim 1,
Wherein the organic light emitting display device emits light to the front surface.
The method according to claim 1,
Wherein the organic light emitting display device is a flexible organic light emitting display device including a flexible substrate.
The method according to claim 1,
Wherein the organic light emitting display device is a transparent organic light emitting display device that maintains transparency in a region excluding the pixel region.
Forming a thin film transistor in each pixel region on a substrate including a plurality of pixel regions;
Forming a first planarization film on the thin film transistor;
Forming a reflective layer on the first planarization layer;
Forming a color filter on the reflective layer;
Forming a second planarization film on the color filter; And
And forming an organic light emitting device including a first electrode, an organic light emitting layer, and a second electrode on the second planarization layer and emitting light.
13. The method of claim 12,
Wherein the second electrode is formed of IZO.
13. The method of claim 12,
Forming an encapsulation layer on the organic light emitting device; And
And forming an ultraviolet shielding film on the sealing layer.
13. The method of claim 12,
Wherein the color filter is formed in the same color as that of light emitted from the organic light emitting device.
13. The method of claim 12,
The forming of the first planarization layer may include:
And forming a first contact hole exposing a drain electrode of the thin film transistor by etching the first planarization film.
17. The method of claim 16,
Wherein the reflective layer is formed to extend on the first contact hole.
18. The method of claim 17,
Wherein forming the second planarization layer comprises:
And etching the second planarization layer to form a second contact hole exposing the reflective layer in a region corresponding to the first contact hole.
19. The method of claim 18,
Wherein the first electrode is connected to the drain electrode of the thin film transistor with the reflective layer interposed therebetween.

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