KR102283853B1 - Organic Light Emitting Display Device and Method for fabricating the thereof - Google Patents

Abstract

The present invention discloses an organic light emitting display device and a method for manufacturing the same. The disclosed organic light emitting display device of the present invention includes: a substrate in which red (R), green (G), and blue (B) sub-pixel regions are partitioned; a bank layer formed on the substrate to divide the red (R), green (G), and blue (B) sub-pixel regions into unit pixel regions; and an organic light emitting diode formed on a substrate between the bank layers and including a first electrode, an organic light emitting layer, and a second electrode, wherein the first electrode is red (R), green (G) and blue (B). ) each sub-pixel region has a different thickness.
The organic light emitting display device and the method for manufacturing the same according to the present invention provide different thicknesses of electrodes corresponding to the red (R), green (G) and blue (B) sub-pixel regions to form red (R) and green (G) sub-pixel regions. and red (R), green (G), and blue (B) lights can be independently emitted from each of the blue (B) sub-pixel regions.

Description

Organic Light Emitting Display Device and Method for fabricating the thereof

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device in which a distance between an organic light emitting layer and an electrode is adjusted to generate light of different wavelengths according to the microcavity principle, and an organic light emitting display device and the same It relates to a manufacturing method.

A video display device that implements a variety of information on a screen is a key technology in the information and communication era, and is developing in the direction of thinner, lighter, portable and high-performance. Accordingly, as a flat panel display capable of reducing the weight and volume, which are disadvantages of a cathode ray tube (CRT), an organic light emitting diode (OLED) that displays an image by controlling the emission amount of an organic light emitting layer is in the spotlight.

The organic light emitting display device is a self-luminous device, and since a backlight used in a liquid crystal display device, which is a non-light emitting device, is not required, it is possible to be lightweight and thin.

In addition, the viewing angle and contrast ratio are superior to those of the liquid crystal display device, and it is advantageous in terms of power consumption, direct current low voltage driving is possible, the response speed is fast, the internal components are solid, so the external shock is strong, and the use temperature range is wide. has a

In particular, since the manufacturing process is simple, there is an advantage in that the production cost can be greatly reduced compared to the conventional liquid crystal display device. An organic light emitting diode display having these characteristics is largely divided into a passive matrix type and an active matrix type. In the passive matrix type, a device is formed in a matrix form while crossing signal lines, whereas an active matrix type device is formed. The type is such that a thin film transistor, which is a switching element that turns on/off a pixel, a driving thin film transistor that passes current, and a capacitor that maintains a voltage to the driving thin film transistor for one frame are located for each pixel.

Recently, since the passive matrix type has many limiting factors such as resolution, power consumption, and lifespan, research on an active matrix type organic light emitting diode display capable of realizing a high resolution or a large screen is being actively conducted.

In addition, such an organic light emitting display device is divided into a top emission type and a bottom emission type according to the transmission direction of the emitted light. There is a problem that it is difficult to apply to high-resolution products because of the limitation of

Accordingly, recently, research on a top emission method having a high aperture ratio and high resolution is being actively conducted.

1 is a diagram illustrating a structure of a top emission type organic light emitting display device according to the related art.

Referring to FIG. 1 , in a conventional top emission type organic light emitting display device, a first red (Red), green (Green), and blue (Blue) organic light emitting diode (R, G, B) is formed for each sub-pixel area. It is composed of a substrate 10 and a second substrate 30 facing the first substrate 10 .

In addition, although not shown in the drawing, a driving thin film transistor (D-Tr) is formed on the first substrate 10 for each sub-pixel region in which the red (R), green (G) and blue (B) organic light emitting diodes are formed. and switching elements, gate lines, data lines, and power lines for controlling the organic light emitting diodes R, G, and B connected to each of the driving thin film transistors D-Tr are formed.

In addition, the organic light emitting diodes (R, G, B) sequentially on the anode (anode), a hole injection layer (HIL), a hole transport layer (HTL), red, green and blue organic light emitting layer (EML), an electron transport layer (ETL) ), an electron injection layer (EIL) and a cathode are formed in a stacked structure.

In addition, each sub-pixel area is separated by a bank layer 20 as shown in FIG. 1 .

However, in the conventional top emission type organic light emitting display device, a bank layer is formed on a substrate on which a thin film transistor is formed to separate each pixel region, and red (R), green (G), and blue (B) are formed in each pixel region. ), because the organic materials are sequentially formed, there is a disadvantage in that the process is complicated.

In addition, in general, the red organic light emitting layer, the green organic light emitting layer, and the blue organic light emitting layer respectively formed in the red (R), green (G) and blue (B) organic light emitting diodes are formed to have different thicknesses due to different emission wavelengths.

For this reason, the area of the organic light emitting diodes of the conventional organic light emitting diode display cannot maintain a uniform plane, and thus there is a problem in that the quality of the screen is deteriorated.

According to the present invention, electrode thicknesses corresponding to the red (R), green (G), and blue (B) sub-pixel regions are formed to be different from each other in the red (R), green (G), and blue (B) sub-pixel regions. An object of the present invention is to provide an organic light emitting display device capable of emitting red (R), green (G) and blue (B) light independently, and a method for manufacturing the same.

In addition, in the present invention, one electrode is formed to correspond to the red (R), green (G) and blue (B) organic light emitting diodes, and the thickness of the electrodes is changed to red (R), green (G) and blue (B). ) Another object of the present invention is to provide an organic light emitting display device capable of generating light of different wavelengths for a microcavity effect by forming differently for each pixel area, and a method for manufacturing the same.

In addition, according to the present invention, the organic light emitting diode layer formed in the organic light emitting display device is formed in units of red (R), green (G), and blue (B) pixel regions to simplify the process and realize high resolution. Another object of the present invention is to provide a display device and a method for manufacturing the same.

In order to solve the problems of the prior art, an organic light emitting display device of the present invention includes: a substrate in which red (R), green (G), and blue (B) sub-pixel regions are partitioned; a bank layer formed on the substrate to divide the red (R), green (G), and blue (B) sub-pixel regions into unit pixel regions; and an organic light emitting diode formed on a substrate between the bank layers and including a first electrode, an organic light emitting layer, and a second electrode, wherein the first electrode is red (R), green (G) and blue (B). ) each sub-pixel region has a different thickness.

In addition, the method of manufacturing an organic light emitting display device of the present invention includes: providing a substrate in which red (R), green (G), and blue (B) sub-pixel regions are partitioned; forming a bank layer formed on the substrate to divide the red (R), green (G), and blue (B) sub-pixel regions into unit pixel regions; forming a metal film on the substrate on which the bank layer is formed, and forming a first photoresist pattern using a mask divided into a first transmission region, a second transmission region, a third transmission region, and a non-transmission region; forming a second photoresist pattern after etching the metal film using the first photoresist pattern as a mask and ashing; forming a first electrode having a different thickness for each red (R), green (G), and blue (B) sub-pixel region by etching a metal layer using the second photoresist pattern as a mask; and forming an organic light emitting layer and a second electrode on the first electrode to complete the organic light emitting diode.

The organic light emitting display device and the method for manufacturing the same according to the present invention provide different thicknesses of electrodes corresponding to the red (R), green (G) and blue (B) sub-pixel regions to form red (R) and green (G) sub-pixel regions. and red (R), green (G), and blue (B) lights can be independently emitted from each of the blue (B) sub-pixel regions.

In addition, in the organic light emitting display device and the manufacturing method thereof of the present invention, one electrode is formed to correspond to the red (R), green (G) and blue (B) organic light emitting diodes, and the thickness of the electrode is set to red (R). , green (G) and blue (B) are formed differently for each pixel area, so that light of different wavelengths can be generated in the microcavity effect.

In addition, the organic light emitting display device and the manufacturing method thereof of the present invention simplify the process by forming the bank layer formed in the organic light emitting display device in units of red (R), green (G), and blue (B) pixel regions. And it has the effect of enabling high-resolution implementation.

1 is a diagram illustrating a structure of a top emission type organic light emitting display device according to the related art.
2 is a diagram illustrating a structure of an organic light emitting display device according to a first embodiment of the present invention.
3A to 3D are diagrams illustrating a manufacturing process of an organic light emitting diode display according to the present invention.
4A to 4C are diagrams for explaining the microcavity effect applied to the organic light emitting display device of the present invention.
5 is a diagram illustrating a structure of an organic light emitting display device according to a second exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

The organic light emitting display device is divided into a top emission type and a bottom emission type according to the transmission direction of the emitted light. Hereinafter, the top emission type will be described as an example in the present invention. However, it can also be applied to the bottom light emitting method.

2 is a diagram illustrating a structure of an organic light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 2 , although not shown, the organic light emitting display device according to the first embodiment of the present invention is a substrate 100 on which a driving thin film transistor (D-Tr), a switching element, a gate line, a data line, and a power line are formed. ), a single organic light emitting diode is formed in the red (R), green (G) and blue (B) sub-pixel regions.

The thin film transistors constituting the driving thin film transistor and the switching element may be formed in a top-gate type or a bottom-gate type, and the channel layer may be formed of a crystalline silicon film or an oxide semiconductor such as IGZO.

In the organic light emitting display device according to the first exemplary embodiment of the present invention, red (R), green (G), and blue (B) sub-pixel regions are defined as one unit pixel, and red (R) and green regions are defined in the unit pixel region. One organic light emitting diode emitting independent red (R), green (G), and blue (B) light is formed for each (G) and blue (B) sub-pixel area.

Accordingly, in the organic light emitting diode display of the present invention, the bank layer 150 is formed in units of red (R), green (B), and blue (B) sub-pixel regions. That is, in the first embodiment of the present invention, a bank layer for separating each of the red (R), green (B), and blue (B) sub-pixel regions is not formed.

Therefore, it is easy to apply to a high-resolution organic light emitting display device.

The bank layer 150 may be formed of one material selected from among organic insulating material black resin, graphite powder, gravure ink, black spray, and black enamel. In addition, the bank layer may be formed in a structure in which materials having different refractive indices are stacked.

In the organic light emitting display device according to the first embodiment of the present invention, a first electrode (R), green (G), and blue (B) having different thicknesses for each sub-pixel region on the substrate 100 ( 120) is formed.

The first electrode 120 is an anode of the organic light emitting diode, and may be formed of a material having a relatively large work function value, such as aluminum (Al).

A balance layer 121 formed of a transparent conductive material (ITO, IZO, ITZO) is further formed on the first electrode 120 . The balance layer 121 is formed to balance energy with the work function of the first electrode 120 .

As described above, when the balance layer 121 is formed on the first electrode 120 , holes are injected into the balance layer 121 corresponding to the red (R), green (G), and blue (B) sub-pixel regions. A hole layer 125 composed of a hole injection layer (HIL) and a hole transport layer (HTL) is formed.

Then, on the hole layer 125 , the organic light emitting layer 130 , the electron transport layer (ETL) and the electron injection layer (EIL) are formed on the electron layer 131 and the second electrode 140 ). ) to form

The organic light emitting layer 130 is formed of a white (W) organic light emitting material to emit white light.

In addition, since the thickness of the first electrode 120 is different for each red (R) region, green (G) region, and blue (B) region that are sub-pixel regions, the organic light emitting layer 130 and the second electrode 120 have different thicknesses. The distances between the electrodes 120 have different distances H depending on the thickness of the electrodes.

In the red (R) region, the distance between the first electrode 120 and the organic emission layer 130 is H1, and in the green (G) region, the distance between the first electrode 120 and the organic emission layer 130 is H2 In the blue (B) region, the distance between the first electrode 120 and the organic light emitting layer 130 is H3.

Accordingly, in the red (R), green (G), and blue (B) sub-pixel regions, light generated from the organic light emitting layer 130 is emitted from the first electrode 120 by the microcavity principle described with reference to FIGS. 4A to 4C below. Light of a wavelength where constructive interference occurs while being reflected, that is, light of a different wavelength (λ) is emitted according to the distance (H1, H2, H3).

According to the above Equations 1 and 2, it is possible to obtain light in a wavelength band where beam interference occurs according to the distance between the first electrode 120 and the organic light emitting layer 130 .

refractive index [n=1.6] Wavelength (λ) [nm] Thickness (H) [nm] Blue 450 70 Green 545 85 Red 640 100

As shown in Table 1, in order to emit light of a red wavelength from the red (R) sub-pixel region, it is preferable to implement a distance between the first electrode 120 and the organic light emitting layer 130 to be 100 nm.

In addition, in order to emit light of a green wavelength from the green (G) sub-pixel region, it is preferable to implement a distance between the first electrode 120 and the organic light emitting layer 130 to be 85 nm.

In addition, in order to emit light of a blue wavelength from the blue (B) sub-pixel region, it is preferable to implement a distance between the first electrode 120 and the organic light emitting layer 130 to be 70 nm.

That is, in the present invention, the path (distance) through which the light generated by the organic light emitting layer 130 is reflected and emitted is adjusted in the red (R) region, the green (G) region, and the blue (B) sub-pixel region to form one electrode. can independently emit red (R), green (G) and blue (B) light.

In the organic light emitting display device according to the first embodiment of the present invention, electrodes corresponding to the red (R), green (G), and blue (B) sub-pixel regions have different thicknesses from each other to form the red (R), green ( There is an effect that red (R), green (G), and blue (B) light can be independently emitted from the G) and blue (B) sub-pixel regions, respectively.

Further, in the organic light emitting display device according to the first embodiment of the present invention, one electrode is formed to correspond to the red (R), green (G), and blue (B) organic light emitting diodes, and the thickness of the electrode is reduced to the red (R), green (G), and blue (B) organic light emitting diodes. By forming differently for each R), green (G), and blue (B) pixel areas, there is an effect that light having different wavelengths can be generated in the microcavity effect.

In addition, in the organic light emitting display device according to the first embodiment of the present invention, the bank layer formed in the organic light emitting display device is formed in units of red (R), green (G) and blue (B) pixel areas, so that the process It has the effect of simplifying and enabling high-resolution implementation.

3A to 3D are diagrams illustrating a manufacturing process of an organic light emitting diode display according to the present invention.

3A to 3D , in the organic light emitting diode display of the present invention, red (R), green (G), and blue (B) sub-pixel regions are defined as unit pixel regions, and thin film transistors, gates, and data lines are A bank layer 150 is formed for each unit pixel area on the formed substrate 100 .

As described above, when the bank layer 150 is formed on the substrate 100 , the first metal layer 120a is formed between each bank layer 150 . The first metal layer 120a may be formed by a sputtering method.

Then, a photoresist film is formed on the first metal film 120a, and exposure and development processes are performed using a mask divided into a first transmissive region, a second transmissive region, a third transmissive region and a non-transmissive region. 1 A photoresist pattern 300 is formed.

The first transmissive region may transmit 30% of light, the second transmissive region may transmit 50% of light, and the third transmissive region may transmit 100% of light.

Transmittances of the first and second transmission regions may be variously adjusted to adjust the thickness of the first metal layer 120a corresponding to the red (R), green (G), and blue (B) sub-pixel regions. . For example, the first transmissive region may be formed of 70%, and the second transmissive region may be formed of 25%.

Accordingly, the first photoresist pattern 300 is formed to have different thicknesses in regions corresponding to the red (R), green (G), and blue (B) sub-pixel regions.

As described above, when the first photoresist pattern 300 is formed, an etching process is performed, and then an ashing process is performed to form the second photoresist layer pattern 301 as shown in FIG. 3B .

An etching process is performed using the second photoresist layer pattern 301 as a mask to form a second metal layer 120b thinner than the first metal layer 120a.

In the same manner, after ashing the second photoresist layer pattern 301 , the thickness of the second metal layer 120b in the green (G) sub-pixel area is thinner than that of the first metal layer 120a in the blue (B) sub-pixel area. The etching process is performed to make it thicker.

Since the metal layer of the blue (B) sub-pixel region is exposed to the etching process until the first electrode 120 is completed, the thickness etched by the second photoresist layer pattern 301 can be adjusted. That is, when the metal film corresponding to the green (G) sub-pixel region is etched to realize the electrode thickness, the electrode thickness of the blue (B) sub-pixel region is also finally completed.

As illustrated in FIG. 3C , when the etching process is completed, the first electrode 120 having different thicknesses in the red (R), green (G), and blue (B) sub-pixel regions is completed.

Then, a transparent conductive material (ITO, IZO, ITZO) is formed on the first electrode 120 to form a balance layer 121 on the first electrode 120 .

Then, as shown in FIG. 3D , a hole injection layer (HIL) and a hole transport layer (HTL) are formed in regions corresponding to the red (R), green (G) and blue (B) sub-pixel regions. A hole layer 125 composed of a transport layer) is formed.

An organic light emitting layer 130 is formed on the hole layer 125 , followed by an electron transport layer (ETL) and an electron injection layer (EIL) composed of an electron layer 131 and a second electrode. (140) is formed.

Since the thickness of the first electrode 120 of the organic light emitting diode is different for each red (R) region, green (G) region, and blue (B) sub-pixel region, the thickness between the organic light emitting layer 130 and the first electrode 120 is different. The distance varies according to the red (R) region, the green (G) region, and the blue (B) sub-pixel region.

In the red (R) region, the distance between the first electrode 120 and the organic light emitting layer 130 becomes H1, in the green (G) region, H2, and in the blue (B) region, H3.

Accordingly, as described in FIG. 2 , the red (R) region, the green (G) region, and the blue (B) sub-pixel region are not separated by the bank layer, respectively, and the formed organic light emitting layer is also a white (W) organic light emitting layer. However, different wavelengths of light are emitted from the red (R) region, the green (G) region, and the blue (B) region.

4A to 4C are diagrams for explaining the microcavity effect applied to the organic light emitting display device of the present invention.

4A to 4C , a first electrode E1 is formed on a substrate G formed of a transparent insulating material, and a first hole layer H1 having a predetermined inclined surface is formed on the first electrode E1. ), a second hole layer H2 and an organic light emitting layer EML, and a plurality of second electrodes E2 are formed.

Due to the inclined surface of the first hole layer H1 , each of the plurality of second electrodes E2 has a different distance from the first electrode E1 .

When a voltage is supplied to the first electrode E1 and the second electrode E2 in the structure as described above, the light generated from the organic light emitting layer EML is reflected by the second electrodes E2, respectively, and is separated from each other at different distances. After advancing the optical path, the light is emitted to the rear surface of the first electrode E1.

4B and 4C , light having a wavelength of 600 nm is emitted from the first second electrode (E2) region (①), and light having a wavelength between 575 to 600 nm is emitted from the second second electrode (E2) region (②). is released

In addition, light of a wavelength of 550 to 560 nm is emitted from the third second electrode (E2) region (③), 525 nm from the fourth region (④), 480 nm from the fifth region (⑤), and 475 nm from the sixth region (⑥). you can see

That is, when the distance between the organic light emitting layer and the electrode reflected by the light generated from the organic light emitting layer is adjusted for each region in a single organic light emitting diode, it can be seen that light of various wavelengths is independently generated by the microcavity effect.

In the first and second embodiments of the present invention, the microcavity effect was basically used, but the distance between the organic light emitting layer and the electrode was implemented by forming different thicknesses of the electrodes for each red, green, and blue region.

5 is a diagram illustrating a structure of an organic light emitting display device according to a second exemplary embodiment of the present invention.

The second embodiment of FIG. 5 has the same structure as that of the organic light emitting diode display of the first embodiment of FIG. 2 , and only a portion in which a balance layer is added is distinguished between the first electrode and the substrate.

Accordingly, the operating principle and manufacturing method of the first embodiment are equally applied to the second embodiment.

Referring to FIG. 5 , in the organic light emitting diode display according to the second exemplary embodiment of the present invention, red (R), green (G), and blue (B) sub-pixel areas are defined as one unit pixel, and the unit pixel area is A single organic light emitting diode emitting independent red (R), green (G), and blue (B) light is formed in each of the red (R), green (G) and blue (B) sub-pixel regions.

In the organic light emitting diode display of the present invention, a bank layer 250 is formed on a substrate 200 in units of red (R), green (B) and blue (B) sub-pixel regions, and between the bank layers 250 . A second balance layer 221 formed of a transparent conductive material (ITO, IZO, ITZO) is formed on the substrate 100 to improve adhesion properties.

A first electrode 220 having a different thickness for each red (R), green (G), and blue (B) sub-pixel region is formed on the second balance layer 221 , and on the first electrode 220 , A first balance layer 222 formed of a transparent conductive material (ITO, IZO, ITZO) is formed.

The first balance layer 222 is formed for energy balance with the work function of the first electrode 220 .

On the first balance layer 222 , a hole layer 225 comprising a hole injection layer (HIL) and a hole transport layer (HTL), a white (W) organic light emitting layer 230 , an electron transport layer (ETL) and an electron injection layer (EIL) ), the electronic layer 231 and the second electrode 240 are formed.

In addition, since the thickness of the first electrode 220 is different for each red (R) region, green (G) region, and blue (B) region, which are sub-higher regions, the organic light emitting layer 230 and the second electrode 220 have different thicknesses. The distance between the first electrodes 220 is different for each red (R), green (G), and blue (B) sub-pixel regions.

Accordingly, in the red (R), green (G), and blue (B) sub-pixel regions, light generated from the organic light emitting layer 230 is reflected by the first electrode 220 according to the microcavity principle described with reference to FIGS. 4A to 4C . As a result, constructive interference occurs, and light of different wavelengths (λ) is emitted according to the distance for each red (R), green (G), and blue (B) sub-pixel area.

In the organic light emitting display device according to the second exemplary embodiment of the present invention, electrodes corresponding to the red (R), green (G), and blue (B) sub-pixel regions have different thicknesses, so that the red (R), green ( There is an effect that red (R), green (G), and blue (B) light can be independently emitted from the G) and blue (B) sub-pixel regions, respectively.

In addition, in the organic light emitting display device according to the second embodiment of the present invention, one electrode is formed to correspond to the red (R), green (G), and blue (B) organic light emitting diodes, and the thickness of the electrode is reduced to the red (R), green (G) and blue (B) organic light emitting diodes. By forming differently for each R), green (G), and blue (B) pixel areas, there is an effect that light having different wavelengths can be generated in the microcavity effect.

Further, in the organic light emitting display device according to the second embodiment of the present invention, a bank layer formed in the organic light emitting display device is formed in units of red (R), green (G) and blue (B) pixel regions, and the process It has the effect of simplifying and enabling high-resolution implementation.

100: substrate 120: first electrode
140: second electrode 121: balance layer
125: hole layer 130: organic light emitting layer
131: electronic layer 140: second electrode
150: bank layer

Claims (18)

a substrate in which a plurality of unit pixel areas each including red (R), green (G), and blue (B) sub-pixel areas are partitioned;
a bank layer formed on the substrate to separate the plurality of unit pixel areas;
an organic light emitting diode formed on the substrate between the bank layers and including a first electrode, an organic light emitting layer, and a second electrode;
a first balance layer formed on the first electrode and made of a transparent conductive material to balance energy with a work function of the first electrode; and
a second balance layer formed between the first electrode and the substrate and made of a transparent conductive material;
The first electrode is made of aluminum and has different thicknesses for each red (R), green (G), and blue (B) sub-pixel regions,
The distance between the organic light emitting layer and the first electrode is different for each red (R), green (G), and blue (B) sub-pixel region,
The bank layer is not disposed at a boundary between the sub-pixel areas included in each unit pixel area,
The distance between the first balance layer and the organic light emitting layer is different for each red (R), green (G), and blue (B) sub-pixel regions,
The distance between the second balance layer and the organic light emitting layer is the same for each red (R), green (G), and blue (B) sub-pixel area.
delete delete delete The organic light emitting display device of claim 1 , wherein the organic light emitting layer emits white light.
The organic light emitting diode display of claim 5 , wherein the organic light emitting diode emits light of different wavelengths for each of the red (R), green (G), and blue (B) sub-pixel regions.
providing a substrate in which a plurality of unit pixel areas each including red (R), green (G), and blue (B) sub-pixel areas are partitioned;
forming a bank layer formed on the substrate to separate the plurality of unit pixel areas;
forming a second balance layer made of a transparent conductive material between the bank layers;
forming a metal layer on the second balance layer and forming a first photoresist pattern using a mask divided into a first transmission region, a second transmission region, a third transmission region, and a non-transmission region;
forming a second photoresist pattern after etching the metal film using the first photoresist pattern as a mask and ashing;
forming a first electrode having a different thickness for each red (R), green (G), and blue (B) sub-pixel region by etching a metal layer using the second photoresist pattern as a mask;
forming a first balance layer made of a transparent conductive material on the first electrode to balance energy with a work function of the first electrode; and
Comprising the step of forming an organic light emitting layer and a second electrode on the first electrode to complete the organic light emitting diode,
The distance between the organic light emitting layer and the first electrode is different for each red (R), green (G) and blue (B) sub-pixel region,
The bank layer is not disposed at a boundary between the sub-pixel areas included in each unit pixel area,
The first electrode is made of aluminum,
The distance between the first balance layer and the organic light emitting layer is different for each red (R), green (G), and blue (B) sub-pixel regions,
The distance between the second balance layer and the organic light emitting layer is the same for each red (R), green (G), and blue (B) sub-pixel region.
delete delete delete The method of claim 7 , wherein the organic light emitting layer emits white light.
The method of claim 7 , wherein the organic light emitting diode emits light having different wavelengths for each red (R), green (G), and blue (B) sub-pixel regions.
delete According to claim 1,
The organic light emitting diode further includes a hole layer disposed between the first balance layer and the organic light emitting layer, and an electron layer disposed between the organic light emitting layer and the second electrode.
15. The method of claim 14,
a thickness of the hole layer in the green (G) sub-pixel region is greater than a thickness of the hole layer in the red (R) sub-pixel region;
A thickness of the hole layer in the blue (B) sub-pixel region is greater than a thickness of the hole layer in the green (G) sub-pixel region.
delete 8. The method of claim 7,
In the step of completing the organic light emitting diode,
The organic light emitting diode may further include a hole layer disposed between the first balance layer and the organic light emitting layer, and an electron layer disposed between the organic light emitting layer and the second electrode.
18. The method of claim 17,
a thickness of the hole layer in the green (G) sub-pixel region is greater than a thickness of the hole layer in the red (R) sub-pixel region;
A thickness of the hole layer in the blue (B) sub-pixel region is greater than a thickness of the hole layer in the green (G) sub-pixel region.

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