KR20090046100A - Organic light emitting diode display device and method of manufacturing the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode display, comprising: a substrate having first, second, and third pixels; a reflection pattern disposed on each of the first, second, and third pixels; and a reflection pattern. And an organic light emitting diode device for forming white light, and color filter patterns respectively disposed on the organic light emitting diode device of the first, second and third pixels, and having different thicknesses, thereby improving color reproducibility. The organic light emitting diode display device can be formed through an easy manufacturing process.

Color filter, white, micro cavity, organic light emitting diode, color reproduction rate, light efficiency

Description

Organic light emitting diode display and manufacturing method thereof {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to an organic light emitting diode display, and more particularly, to an organic light emitting diode display having a color filter and a method of manufacturing the same.

The present invention relates to an organic light emitting diode display. Specifically, the present invention relates to an organic light emitting diode display and a method of manufacturing the same that can improve optical characteristics.

The display device provides the image information to the user. Such display devices include liquid crystal display devices, field emission display devices, organic light emitting diodes display devices, plasma display devices, and the like. do.

In particular, the organic light emitting diode display device is a self-luminous type and does not require a backlight light source such as an LCD, so that the organic light emitting diode display can be made thin and light, and can be manufactured through a simple process. In addition, organic light emitting diode display devices have many advantages such as low voltage driving, high luminous efficiency, and wide viewing angle, and are rapidly rising as next generation displays.

The organic light emitting diode display includes an anode, an organic light emitting layer, and a cathode sequentially formed on a substrate. In the organic light emitting diode display, holes and electrons provided at the anode and the cathode recombine in the organic light emitting layer to form excitons, and the excitons fall to a stable low energy level at an unstable high energy level to form light. do. Here, the light passes through the electrode and the substrate of any one of the anode and the cathode to provide an image to the user.

When the light is emitted from the substrate above the critical angle, the light causes total reflection at the interface between the electrode having the high refractive index and the substrate having the low refractive index. Due to this total reflection, about one quarter of the light formed in the organic light emitting layer is emitted to the outside. Accordingly, the organic light emitting diode display has a problem of low light efficiency. When the light efficiency is lowered, the luminance of the organic light emitting diode display is lowered. Therefore, in order to increase the luminance of the organic light emitting diode display, the driving voltage of the organic light emitting diode display should be increased. As a result, power consumption of the organic light emitting diode display may increase, and the organic light emitting layer included in the organic light emitting diode display may deteriorate, thereby reducing the lifespan of the organic light emitting diode display.

In addition, the organic light emitting diode display may implement full color by independent driving of red, green, and blue pixels. In this case, the organic light emitting diode display may emit a wavelength that is not related to a wavelength for realizing a full color, thereby reducing color reproduction.

One object of the present invention is to provide an organic light emitting diode display device capable of improving light efficiency and color reproducibility.

Another object of the present invention is to provide a method of manufacturing the organic light emitting diode display.

In order to achieve the above technical problem, an aspect of the present invention provides an organic light emitting diode display. The organic light emitting diode display device includes a substrate including first, second, and third pixels, a reflection pattern disposed on each of the first, second, and third pixels, and a white light disposed on the reflection pattern. Organic light emitting diode elements, and color filter patterns disposed on the organic light emitting diode elements of the first, second, and third pixels, respectively, and having different thicknesses.

In order to achieve the above technical problem, another aspect of the present invention provides a method of manufacturing an organic light emitting diode display. The manufacturing method includes providing a substrate having first, second, and third pixels, forming a reflective pattern and an organic light emitting diode element on each of the first, second, and third pixels; Forming color filter patterns having different thicknesses on the upper substrate corresponding to the second and third pixels, respectively; and bonding the substrate and the upper substrate to each other.

In order to realize full color, the organic light emitting diode display of the present invention forms a color filter pattern on the organic light emitting diode element portion forming white light instead of forming an organic light emitting pattern separated for each color using a shadow mask. In addition, it can be easily applied to large-area substrates, can reduce the initial capital investment cost, and can be formed through a simple process.

In addition, the organic light emitting diode display of the present invention can increase the light sensitivity of the wavelength associated with each color through the micro-cavity effect, as the thickness of the color filter is different for each color, thereby improving the light efficiency and color reproduction rate. You can.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of the organic light emitting diode display. The following embodiments are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the invention is not limited to the embodiments described below and may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like numbers refer to like elements throughout.

1A and 1B are diagrams illustrating an organic light emitting diode display device according to a first embodiment of the present invention.

1A is a plan view of an organic light emitting diode display according to a first exemplary embodiment of the present invention. 1A is an enlarged view of only three pixels forming different light among the plurality of pixels for convenience of description.

Referring to FIG. 1A, an organic light emitting diode display includes a plurality of pixels for displaying an image. Each pixel may be defined as a unit for displaying the image.

The plurality of pixels may include first, second, and third pixels P1, P2, and P3 that implement different colors. For example, the first pixel P1 may implement red, the second pixel P2 may implement green, and the third pixel P3 may implement blue.

The driving element portion and the organic light emitting diode element portion electrically connected to each other are disposed in the pixels.

Although not shown in the drawings, the pixels may be defined by gate lines and data lines crossing each other. In addition, a driving line crossing the pixel is further disposed.

The driving element is electrically connected to the gate line and the data line. In addition, the driving element is electrically connected to a driving wiring for supplying power. The driving device unit may include at least two thin film transistors. For example, the driving device unit controls the brightness of the organic light emitting diode device by controlling a current applied to the organic light emitting diode device from the driving wiring by selecting a switching thin film transistor to select a pixel and the switching thin film transistor. A driving thin film transistor may be included. The driving device unit may further include a capacitor configured to charge an electrical signal for driving the driving thin film transistor for a predetermined time.

Accordingly, the driving device unit may drive the organic light emitting diode device to provide an image to a user.

FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A. Here, the organic light emitting diode element portion is electrically connected to the driving element portion, but the driving element portion is not illustrated for convenience of description in FIG. 1B.

Referring to FIG. 1B, the organic light emitting diode display faces the substrate 100 and the substrate 100 in which a plurality of pixels, for example, the first, second, and third pixels P1, P2, and P3 are defined. The upper substrate 200 is included.

On each pixel of the substrate 100, a reflective pattern 102 for reflecting light upward is disposed. The reflective pattern 102 may be made of a material that reflects light. For example, the reflective pattern 102 may be made of any one of Al, AlNd, Ag, Pt, Au, Mg, and alloys thereof. The reflective pattern 102 may have the form of a single layer or multiple layers.

An organic light emitting diode element is disposed on the reflective pattern 102 to form white light. The organic light emitting diode element portion includes a first electrode 110, organic light emitting layers 140, 150, 160, and a second electrode 190.

In detail, the first electrode 110 is disposed on the reflective pattern 102. The first electrode 110 may be an anode, and the second electrode 190 may be a cathode. Alternatively, the first electrode 110 may be a cathode and the second electrode 190 may be an anode. Hereinafter, the first electrode 110 will be described based on the embodiment of the anode.

The first electrode 110 may be formed of a material having a larger work function than the second electrode 110 to be described later. For example, the first electrode 110 may be formed of at least one of ITO, IZO, ZnO, and In 2 O 3.

When the reflective pattern 102 and the first electrode 110 are formed by a photo process using the same mask for convenience of the process, the reflective pattern 102 and the first electrode 110 may have the same shape. . That is, the reflective pattern 102 and the first electrode 110 are separated for each pixel.

A buffer pattern 114 may be further disposed around an edge portion of the first electrode 110 and around each pixel. The buffer pattern 114 may serve to prevent a short between the first electrode 110 and the second electrode 190 to be described later. The charge is concentrated on the edge portion of the first electrode 110, and the organic light emitting layers 140, 150, and 160, which will be described later, corresponding to the edge portion of the first electrode 110 are deteriorated, thereby deteriorating the organic light emitting diode display. This is because the service life may be reduced or the first electrode 110 and the second electrode 190 may be shorted.

The organic light emitting layers 140, 150, and 160 are disposed on the substrate 100 including the first electrode 110. The organic light emitting layers 140, 150, and 160 are stacked with a first organic light emitting layer 140 for forming red light, a second organic light emitting layer 150 for forming green light, and a third organic light emitting layer 160 for forming blue light. The organic light emitting layers 140, 150, and 160 may form white light.

A first charge injection layer 120 and a second charge transport layer 130 may be further interposed between the first electrode 110 and the organic light emitting layers 140, 150, and 160. The first charge injection layer 120 and the second charge transport layer 130 match energy levels of the first electrode 110 and the organic light emitting layers 140, 150, and 160, and thus, at the first electrode 110. The organic light emitting layer 140, 150, 160 serves to efficiently provide a first charge. In addition, the first charge injection layer 120 and the second charge transport layer 130 may further serve as an energy barrier to prevent the first charge from being emitted from the organic light emitting layers 140, 150, and 160. The light efficiency of the light emitting diode display can be improved.

The second electrode 190 is disposed on the organic light emitting layers 140, 150, and 160. The second electrode 190 may be made of a conductive material having a lower work function than the first electrode 110. For example, the second electrode 190 may be formed of any one of Li, Ca, Al, Ag, Mg, and a laminate thereof. The second electrode 190 may have a thickness of several tens of microwatts so as to transmit light.

A second charge transport layer 170 and a second charge injection layer 180 may be further interposed between the organic light emitting layers 140, 150, and 160 and the second electrode 190. The second charge transport layer 170 and the second charge injection layer 180 match the energy levels of the organic light emitting layers 140, 150, 160 and the second electrode 190, and thus the second electrode 190. From the to the organic light emitting layer (140, 150, 160) to efficiently provide a second charge. In addition, the second charge transport layer 170 and the second charge injection layer 180 prevent emission of the second charge from the organic light emitting layers 140, 150, and 160, thereby improving light efficiency of the organic light emitting diode display. You can.

In the organic light emitting diode display, color filter patterns 210, 220, and 230 are disposed on the upper substrate 200 corresponding to the organic light emitting diode element part to realize full color. Here, the white light formed in the organic light emitting diode element part is filtered by the color filter patterns 210, 220, and 230 so that only a wavelength corresponding to each pixel is emitted to the outside, so that the organic light emitting diode display displays a full color. Can be implemented. For example, the color filter patterns 210, 220, and 230 may include the first, second, and third color filter patterns 210, 220, respectively corresponding to the first, second, and third pixels P1, P2, and P3. 230). Here, the first color filter pattern 210 may implement red, the second color filter pattern 220 may implement green, and the third color filter pattern 230 may implement blue.

However, not all of the white light formed in the organic light emitting diode element portion is emitted toward the color filter patterns 210, 220, and 230, but part of the white light is reflected by the reflective pattern 102. A portion of the reflected light reflected by the reflective pattern 102 is emitted toward the color filter patterns 210, 220, and 230 to be emitted to the upper substrate 200, or the reflective pattern 102 and the upper substrate ( While repeating the reflection between 200), the reflected light may be amplified or canceled to reduce light efficiency and color reproduction by the microcavity effect. Here, the micro-cavity effect may generate multiple reflection interference between the reflective film and the semi-transmissive film, thereby enhancing specific wavelengths and canceling other wavelengths. In other words, in the organic light emitting diode display, a part of the white light formed in the organic light emitting diode element part is amplified by the microcavity effect to form light of an undesired wavelength, thereby lowering color reproducibility, or canceling each other to reduce light efficiency. You can.

When the microcavity effect is used inversely, light having a desired wavelength can be amplified to improve color reproducibility and light efficiency. Here, the wavelength of the light may be amplified or canceled by adjusting the path distance of the light.

In order to achieve full color, the first, second and third pixels P1, P2, and P3 must emit light having different wavelengths, and thus, wavelengths to be augmented for each pixel are different.

Here, the path distance of the light for amplifying a specific wavelength may be designed as shown in Equation 1 below.

L = ∑di × ni = λ × (m-Φ / 2π) / 2

Here, d is the thickness of the layers interposed between the reflective film and the transflective film. For example, the reflective film may be a reflective pattern 102 and the semi-transmissive film may be a second electrode 190. n is the refractive index of the layer. i is the number of layers of the layer interposed between the reflective film and the transflective film. Φ is the phase change in the reflecting surface. And m is an integer (0, 1, 2, 3 ....).

The path distance of the light is affected by the refractive index and the thickness. Here, since the refractive index is a unique property of the material, the path distance of light can be adjusted using the thickness of the layers.

Accordingly, the organic light emitting diode display may adjust the thicknesses of the color filter patterns 210, 220, and 230 disposed between the reflective pattern 102 and the upper substrate 200 in order to adjust the path distance of light for each pixel. . This is because the color filter patterns 210, 220, and 230 are formed on the upper substrate 200 separately from the organic light emitting diode element, and thus, the thickness of the color filter patterns 210, 220, and 230 may be easily controlled. In addition, since the color filter patterns 210, 220, and 230 are patterned for each pixel, a separate process does not need to be added. On the other hand, in order to adjust the path distance of the light, when adjusting the first electrode 110 disposed between the reflective pattern 102 and the upper substrate 200, the first electrode 110 having a different thickness for each pixel The process can be complicated because at least three mask processes have to be performed to form. In addition, when the thickness of the organic light emitting layers 140, 150, and 160 disposed between the reflective pattern 102 and the upper substrate 200 is adjusted, the thickness of the organic light emitting layers 140, 150, and 160 is greater than the design value. If there is a large error, the color is shifted, so that the color reproducibility may rather be lowered. In addition, when the thickness of the organic light emitting layers 140, 150, and 160 has a larger error than the designed value, the organic light emitting layers 140, 150, and 160 must be removed and cleaned. At this time, the driving element portion formed below it may be deformed or damaged.

According to Equation 1, the amplification of the wavelength is proportional to the thickness of the layers interposed between the reflective pattern 102 and the second electrode 190, and thus the pixel emitting the long wavelength light among the plurality of pixels; The thickness of the corresponding color filter patterns 210, 220, and 230 may be the thickest. For example, when the first color filter pattern 210 implements red, the second color filter pattern 220 implements green, and the third color filter pattern 230 implements blue, the first color filter pattern 210 implements the first color. The thickness of the color filter pattern 210 may be the thickest. In addition, the thickness of the third color filter pattern 230 may be the thinnest.

Therefore, the organic light emitting diode display may include color filter patterns 210, 220, and 230 having different thicknesses for each pixel, thereby improving color reproduction and light efficiency.

In addition, the organic light emitting diode display device uses color filter patterns 210, 220, and 230 without performing a process of patterning the organic light emitting layers 140, 150, and 160 for each pixel in order to realize full color. Accordingly, the process of the organic light emitting diode display device can be facilitated. In order to separate and form the organic light emitting layers 140, 150, and 160 for each pixel, the deposition process using a shadow mask is required, and the process is not only complicated but also limited to a large area of the substrate 100 due to the limitation of manufacturing facilities. This is because it is difficult to apply. On the other hand, the color filter patterns 210, 220, and 230 may be easily formed through an inkjet printing method or an exposure and development process.

In addition, to prevent color mixing, a black matrix may be further disposed on the upper substrate corresponding to the periphery of each pixel.

In addition, although not shown in the drawings, a getter may be further disposed on the upper substrate 200 or on the color filter patterns 210, 220, and 230. The getter may remove oxygen and moisture remaining in the organic light emitting display or input from the outside. As a result, the OLED display can be prevented from being degraded by oxygen and moisture. Since the getter emits light through the upper substrate 200, the getter may be made of a transparent material. Examples of the material used as the getter may include nickel sulfate, lithium sulfate, alkali metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, metal perchlorate and phosphorus pentoxide.

Therefore, in the exemplary embodiment of the present invention, the organic light emitting diode display device may be manufactured through an easy process as it is designed to implement full color by including the color filter patterns 210, 220, and 230.

In addition, the color filter patterns 210, 220, and 230 may improve color reproducibility and light efficiency by adjusting the thickness of each pixel to amplify the wavelength of light corresponding to each pixel.

2A through 2D are cross-sectional views illustrating a method of manufacturing an organic light emitting diode display device according to a second embodiment of the present invention.

Referring to FIG. 2A, to manufacture an organic light emitting diode display, a substrate 100 in which a plurality of pixels are first defined is provided.

The reflective pattern 102 and the first electrode 110 are formed on each pixel of the substrate 100. In order to form the reflective pattern 102 and the first electrode 110, a reflective film and a conductive film are sequentially formed on the substrate 100. The reflective film may be formed of any one of Al, AlNd, Ag, Pt, Au, Mg, and alloys thereof. The reflective film may be formed through a deposition method. The conductive film may be formed of any one of ITO, IZO, ZnO, and In 2 O 3. The conductive film may be formed through a deposition method. Thereafter, a photoresist pattern having a predetermined pattern is formed on the conductive film. The photoresist pattern may be formed using an exposure and development process using a mask. The first electrode 110 and the reflective pattern 102 may be formed by etching the conductive layer and the reflective layer by using the photoresist pattern as an etching mask.

As a result, the first electrode 110 and the reflective pattern 102 may have the same shape.

A buffer pattern 114 is formed on an edge portion of the first electrode 110 and the reflective pattern 102 and a peripheral portion of each pixel. The buffer pattern 114 may be formed of an inorganic insulating material or an organic insulating material. When the buffer pattern 114 is formed of an inorganic insulating material, the buffer pattern 114 may be formed through an etching process using a deposition process of the inorganic insulating material and a photoresist pattern having a predetermined pattern. In addition, when the buffer pattern 114 is formed of an organic insulating material, the buffer pattern 114 may be formed using an exposure and development process using a mask.

Referring to FIG. 2B, the first charge injection layer 130, the first charge transport layer 140, and the organic light emitting layer 140 are formed on the substrate 100 including the first electrode 110 and the buffer pattern 114. , 150, 160, second charge transport layer 170 and second charge injection layer 180 are sequentially formed.

When the first electrode 110 is an anode and the second electrode 190 is a cathode, the first charge may be a hole and the second charge may be an electron.

In this case, since the first charge injection layer 120 serves to easily release holes from the first electrode 110, the first charge injection layer 120 has a difference in work function of the first electrode 110. It may be made of a material having a small HOMO. For example, the first charge injection layer 120 is 4,4 ', 4 "-tris (3-methylphenyl-N-phenylamino) triphenylamine) (4,4', 4" -tris (3- methylphenyl-N-phenylamino) triphenylamine; m-MTDATA) or copper phthalocyanine (CuPc). The first charge injection layer 120 may be formed by a vacuum deposition method.

The first charge transport layer 130 prevents energy transfer from the organic light emitting layers 140, 150, and 160, and transports holes provided from the first electrode 110 to the organic light emitting layers 140, 150, and 160. Do it. Examples of the material for forming the first charge transport layer 130 include N, N-bis (naphthalen-1-yl) phenyl-N, N-bis (phenyl) benzidine (N, N'-bis (naphthalen-1-ul) and benzidine derivatives such as phenyl) -N, N'-bis (phenyl) benzidine; NPB). The first charge transport layer 130 may be formed by a vacuum deposition method.

First, second and third organic light emitting layers 140, 150 and 160 respectively forming red, green and blue on the first charge transport layer 130 to form the organic light emitting layers 140, 150 and 160. ) Are formed sequentially. As a result, the organic light emitting layers 140, 150, and 160 may form white light.

The first organic light emitting layer 140 may be formed by co-depositing a first dopant and a first host. For example, the first dopant may be 2-methyl-6- (2- (2,3,6,7, tetrahydro-1H, 5H-benzoquinolizine-9-yl) ethenyl) -4H-pyran- 4-ylidene) propane-dantrile) (2-metyle-6- (20 (2,3,6,7-tetrahydro-1H, 5H-benzo quinolizin-9-yl) ethenyl) -4H-pyran-4- ylidene) propane-dinitrile (DCM2) and rubrene (Rubrene) can be any one. Further, the first host is (N, N-bis (naphthalen-1-yl) phenyl-N, N'-bis (phenyl) benzidiine (N, N'-bis (naphthanlen-1-yl-phenyl) -N, N'-bis (phenyl) benzidine; NPB).

The second organic light emitting layer 150 may be formed by co-depositing a second dopant and a second host. For example, the second dopant may be quinacridone or coumarin. In addition, the second host may be aluminum tris (8-hydroxyquinoline; Alq3).

The third organic light emitting layer 160 may be formed by co-depositing a third dopant and a third host. For example, the third dopant may be 2,5,8,11-tetra-3-butylperylene. In addition, the third host is 4,4'-bis (2,2-diphenyl-ethen-1-yl) -diphenyl (4,4'-bis (2,2-diphenyl-ethene-1-yl) -diphenyl; DPVBi), spiro-DPVBi, DPVBi derivatives and the like.

The second charge transport layer 170 serves to smoothly transfer electrons from the second electrode 190. For example, the second charge transport layer 170 is (2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole) (2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole (PBD) and aluminum tris (8-hydroxyquinoline; Alq3). The second charge transport layer 170 may be formed by a vacuum deposition method.

The second charge injection layer 180 easily discharges electrons from the second electrode 190 and smoothly provides the electrons to the second charge transport layer 170. For example, the second charge injection layer 180 may be formed of lithium fluoride (LiF) or the like. The second charge injection layer 180 may be formed by a vacuum deposition method.

However, in the embodiment of the present invention, the first charge injection layer 120, the first charge transport layer 130, the organic light emitting layers 140, 150, 160, the second charge transport layer 170 and the second charge injection layer The material forming the 180 is not limited thereto.

A second electrode 190 is formed on the second charge injection layer 180. The second electrode 190 may be formed of a conductive material having a lower work function than the first electrode 110. For example, the second electrode 190 may be formed of at least one of Li, Ca, Al, Ag, and Mg.

As a result, the organic light emitting diode device may be formed on the substrate 100 to form the reflective pattern 102 and the white light.

Referring to FIG. 2C, an upper substrate 200 corresponding to the substrate 100 is separately provided. The black matrix pattern 240 is formed along the periphery of each pixel of the upper substrate 200. That is, the black matrix pattern 240 exposes each pixel.

Thereafter, color filter patterns 210, 220, and 230 having different thicknesses are formed to correspond to the first, second, and third pixels P1, P2, and P3. In order to form the 220 and 230, a first color filter pattern 210 corresponding to the first pixel P1 and having a first thickness is formed. In order to form the first color filter pattern 210, a first color filter layer is formed on the upper substrate 200 on which the black matrix pattern 240 is formed. An exposure and development process is performed on the first color filter layer to form the first color filter pattern 210. Thereafter, as in the process of forming the first color filter pattern 210, the second and third color filter patterns 220 and 230 are formed. Here, the second color filter pattern 220 corresponds to the second pixel P2 and has a second thickness smaller than the first thickness. The third color filter pattern 230 has a third thickness corresponding to the third pixel and smaller than the second thickness. The first, second, and third thicknesses may be formed by adjusting the rotation speed of the spin coating method when the first, second, and third color filter layers are formed by spin coating.

Alternatively, the first, second, and third color filter patterns 210, 220, and 230 having different thicknesses may be formed using an inkjet printing method.

In addition, although not shown in the drawing, a getter may be further formed. The getter layer may be formed on the upper substrate 2000 before forming the black matrix pattern 240. Alternatively, the getter may be formed on the first, second and third color filter patterns 210, 220, and 230. It can also be formed in.

Referring to FIG. 2D, an organic light emitting diode display device may be manufactured by bonding the substrate 100 and the upper substrate 2000. In this case, the organic light emitting diode element portion and the color filter patterns 210, 220, and the like. 230 may face each other, and the first, second, and third pixels correspond to the first, second, and third color filter patterns 210, 220, and 230, respectively.

In order to implement full color, the organic light emitting diode display of the present invention uses a shadow mask to form a color filter pattern 210 on the organic light emitting diode element portion that forms white light instead of forming an organic light emitting pattern separated for each color. 220, 230). As a result, the organic light emitting diode display device can be easily applied to the large-area substrate 100, can reduce the initial equipment investment cost, and can be formed through a simple process.

In addition, according to the organic light emitting diode display of the present invention, the thickness of the color filter patterns 210, 220, and 230 is formed differently for each color, thereby increasing the light sensitivity of wavelengths associated with each color through the microcavity effect. Therefore, light efficiency and color reproduction rate can be improved.

Hereinafter, a first organic light emitting diode display manufactured according to an embodiment of the present invention was manufactured, and color reproduction characteristics thereof were examined. In the first organic light emitting diode display, the red, green, and blue color filter patterns are formed to have different thicknesses as in the exemplary embodiment of the present invention. Here, the thickness of the red color filter pattern was formed to 19Å, the thickness of the green color filter pattern was formed to 17Å, the thickness of the blue color filter pattern was formed to 13Å. In addition, the reflective pattern 102 and the organic light emitting diode element of the first organic light emitting diode display are manufactured as shown in Table 1 below.

Configuration Refractive index Thickness Reflection pattern 0.77 / 0.12 (Al / Ag) 2000 ~ 3000 First electrode 1.9 500 First charge injection layer 1.8 60 First charge transport layer 1.82 60 First organic light emitting layer 1.84 50 2nd organic light emitting layer 1.85 200 Third organic light emitting layer 1.85 100 Second charge transport layer 1.72 200 Second charge injection layer 1.39 16 Second electrode 0.77 / 0.12 (Al / Ag) 10-50

The second organic light emitting diode display is compared with the first organic light emitting diode display. The second organic light emitting diode display has the same structure and the same thickness as the first organic light emitting diode display. In the second organic light emitting diode display, the red, green, and blue color filter patterns are formed to have the same thickness. The thicknesses of the red, green, and blue color filter patterns were 13 μs.

3 is a light emission spectrum measured from the first and second organic light emitting diode display devices.

As shown in FIG. 3, the peaks of the red, green, and blue spectra (MR, MG, MB) measured by the first organic light emitting diode display are measured by the red, green, and blue measured by the second organic light emitting diode display. It has light intensities that are closer than the peaks of each spectrum (R, G, B).

4 is a color coordinate measured from the first and second organic light emitting diode display devices.

As shown in FIG. 4, the color reproducibility of the first organic light emitting diode display was improved to 16.9% compared to the second organic light emitting diode display.

1A is a plan view of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A.

2A through 2D are cross-sectional views illustrating a method of manufacturing an organic light emitting diode display device according to a second embodiment of the present invention.

3 is a light emission spectrum measured from the first and second organic light emitting diode display devices.

4 is a color coordinate measured from the first and second organic light emitting diode display devices.

 (Explanation of reference numerals for the main parts of the drawings)

100: substrate 102: reflection pattern

110: first electrode 120: first charge injection layer

130: first charge transport layer 140: first organic light emitting layer

150: second organic light emitting layer 160: third organic light emitting layer

170: second charge transport layer 180: second charge injection layer

190: second electrode 200: upper substrate

210: first color filter pattern 220: second color filter pattern

230: second color filter pattern

Claims (7)

A substrate having first, second and third pixels; A reflection pattern disposed on each of the first, second, and third pixels; An organic light emitting diode device disposed on the reflective pattern to form white light; And An organic light emitting diode display device comprising color filter patterns having different thicknesses, respectively disposed on the organic light emitting diode elements of the first, second and third pixels. The method of claim 1, The color filter patterns may include first, second, and third color filter patterns implementing red, green, and blue colors, respectively, wherein the thickness of the first color filter pattern is thickest among the color filter patterns. Organic light emitting diode display. The method of claim 1, The color filter patterns may include first, second, and third color filter patterns implementing red, green, and blue colors, respectively, wherein the thickness of the third color filter pattern is the thinnest among the color filter patterns. Organic light emitting diode display. The method of claim 1, And the color filter patterns are disposed on an upper substrate facing the substrate. The method of claim 4, wherein  And a getter interposed between the color filter patterns and the upper substrate or disposed on the color filter pattern. Providing a substrate having first, second and third pixels; Forming a reflective pattern and an organic light emitting diode element on each of the first, second and third pixels; Forming color filter patterns having different thicknesses on upper substrates corresponding to the first, second and third pixels, respectively; And And attaching the substrate and the upper substrate to each other. The method of claim 6, The color filter patterns are formed using an inkjet printing method or a spin coating method.

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