KR20110028716A - Organic light emitting display device and manufacturing method of the same - Google Patents

Abstract

PURPOSE: An organic light emitting display device and a manufacturing method thereof are provided to form colorful or white organic electroluminescence light emitting devices at a specific location, thereby realizing a panel with high resolution. CONSTITUTION: A substrate(110) is defined by white and colorful organic electroluminescence light emitting device areas. The first electrode(131), the first common layer(132), the second common lalyer(133), the first light emitting layer(134a), and the third common layer(135) are successively deposited on the front side of the substrate using the first mask. The fourth common layer(136), the second light emitting layer, and the fifth common layer(137) are successively deposited on the third common layer of the white organic electroluminescence light emitting device area using the second mask. The second electrode(138) is formed on the front side of the substrate using the first mask. The second electrode is formed on the fifth common layer of the white organic electroluminescence device area.

Description

Organic Light Emitting Display Device and Manufacturing Method of the Same}

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 and a method of manufacturing the same, which can easily implement black or white at a specific position and improve yield.

Video display devices that realize various information as screens are the core technologies of the information and communication era, and are developing in a direction of thinner, lighter, portable and high performance. Accordingly, as a flat panel display device that can reduce the weight and volume, which is a disadvantage of the cathode ray tube (CRT), an organic light emitting display device for displaying an image by controlling the amount of light emitted from the organic light emitting layer has been spotlighted. An organic light emitting display device is a self-luminous device using a thin light emitting layer between electrodes, and has an advantage of thinning like a paper.

In the active matrix organic light emitting display (AMOLED), pixels composed of three color (R, G, B) sub-pixels are arranged in a matrix to display an image. Each sub pixel includes an organic light emitting diode and a cell driver for independently driving the organic light emitting diode. The cell driver includes at least two thin film transistors and a storage capacitor to control the amount of current supplied to the organic light emitting display according to the data signal to control the brightness of the organic light emitting display.

The organic light emitting device is composed of an electrode and an organic light emitting layer, the organic light emitting layer is composed of a common layer and the light emitting layer. In the related art, the organic light emitting diode is manufactured as a sub pixel unit 30 of R, G, and B on the substrate 10 using a fine metal mask 50 as shown in FIG. 1. Or, in order to improve the luminous efficiency of the organic light emitting device, a shadow mask is used to deposit a sub-pixel unit of white on a substrate and manufacture a method of adding R, G, and B color filters.

However, when implementing a white organic light emitting device using a fine metal mask, there is a limit in reducing the size of the open area, such as bending or cutting of the blocking area between the open areas of the fine metal mask, and it is difficult to be misaligned. easy. In addition, the fine metal mask causes a defect such as scratching of the substrate, thereby lowering the yield.

In case of implementing the white organic light emitting device using a shadow mask, the white organic light emitting device is uniformly applied to the entire panel so that the same color is displayed as a whole, so that individual information display or the display of leader lines cannot be displayed. There is.

An object of the present invention is to provide an organic light emitting display device and a method of manufacturing the same, which can easily implement black or white at a specific position and improve yield.

According to an aspect of the present invention, there is provided a method of manufacturing an organic light emitting display device, the method including preparing a substrate defined by a white organic light emitting diode region and a colored organic light emitting diode region; Sequentially depositing a first common layer, a second common layer, a first light emitting layer, and a third common layer; and using a second mask on a third common layer of the white organic light emitting device region, using a fourth common layer and a second Depositing a light emitting layer and a fifth common one by one; and forming a second electrode on the entire surface of the substrate by using the first mask.

Here, the first mask is opened with respect to the white organic light emitting diode region and the colored organic light emitting diode region, and the second mask is opened with respect to the white organic light emitting diode region only.

The second electrode is formed on the fifth common layer of the white organic light emitting diode region, and is formed on the third common layer of the colored organic light emitting diode region.

The method of manufacturing an organic light emitting display device according to the present invention further includes depositing a third light emitting layer between the second light emitting layer and the second electrode by using the second mask.

The first light emitting layer is formed of a blue color emitting material.

The organic light emitting diode formed in the white organic light emitting diode region includes a light emitting layer made of a blue color material and a yellow color material, or includes a light emitting layer made of a blue color material and a red color material, or a blue color material and a red color material. And a light emitting layer comprising a green color developing material, or a light emitting layer including a blue color developing material, a green color developing material, and a yellow color developing material, or a light emitting layer including a blue color developing material, a green color developing material, a yellow color developing material, and a red color developing material. .

An organic light emitting display device according to the present invention includes a substrate defined by a white organic light emitting diode region and a colored organic light emitting diode region, a first electrode, a first common layer, a second common layer, A white organic light emitting diode formed of a first light emitting layer, a third common layer, a fourth common layer, a second light emitting layer, a fifth common layer, and a second electrode, and a first electrode and a first electrode in the colored organic light emitting element region. The organic light emitting device may include a color organic light emitting device that is stacked with a common layer, a second common layer, a first light emitting layer, a third common layer, and a second electrode.

The colored organic light emitting diode is formed at the edge of the substrate or the center of the substrate.

The first light emitting layer is made of a blue color-emitting material, the second light emitting layer is made of one of a yellow color material and a red color material, or the second light emitting layer is a mixture of green color material and red color material, green It is formed of a mixture of a chromogenic substance and a yellow chromogenic substance and one of a mixture of a green chromogenic substance, a yellow chromogenic substance, and a red chromogenic substance.

Since the present invention can be manufactured without using a fine metal mask, it is possible to prevent a substrate defect and improve the yield. In addition, the process of adding a color filter can be omitted, thereby lowering the process cost.

In addition, the present invention can form a colored or white organic light emitting device at a desired specific position to enable a high resolution panel as well as display information or display lines.

In addition, the present invention is effective to use for the use of patient information or indication of unusual matters when using as a medical display.

Hereinafter, an organic light emitting display device and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view illustrating an organic light emitting display device according to a first embodiment of the present invention.

An organic light emitting display device according to a first exemplary embodiment of the present invention includes a substrate 110 defined by a white organic light emitting diode region and a colored organic light emitting diode region, and an organic light constituting a plurality of sub pixels on the substrate 110. Electroluminescent elements 130 and 140 are included. The organic light emitting diodes 130 and 140 are layers in which light is emitted while the axtone formed by combining holes and electrons respectively injected by the first electrode 131 and the second electrode 138 falls to the ground state. The white organic light emitting diode 130 and the colored organic light emitting diode 140 are included.

In the first embodiment of the present invention, three sub-pixels constitute one unit pixel, and in one unit pixel, two sub-pixels are composed of the white organic light emitting diodes 130 and one sub-pixel is colored organic electroluminescence. Element 140. The white organic light emitting diode 130 is formed in the white organic light emitting diode region of the substrate 110, and the colored organic light emitting diode 140 is formed in the colored organic light emitting diode region.

The white organic light emitting diode 130 is an organic light emitting diode that emits white light. The white organic light emitting diode 130 may include a first electrode 131, a first common layer 132, a second common layer 133, 1st light emitting layer 134a, 3rd common layer 135, 4th common layer 136, 2nd light emitting layer 134b, 3rd light emitting layer 134c, 5th common layer 137, and 5th Two electrodes 138.

The colored organic light emitting diode 140 is an organic light emitting diode that emits light of a color other than white. The colored organic light emitting diode 140 includes a first electrode 131, a first common layer 132, and a second common layer 133 that are sequentially stacked. And a first light emitting layer 134a, a third common layer 135, and a second electrode 138.

The first electrode 131 of the white organic light emitting diode 130 and the colored organic light emitting diode 140 is called an anode as an electrode for hole injection, and has a high work function as an electrode for hole injection. The emitted light of is formed of a transparent conductive layer so that it can come out of the device. As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or these It is formed by the combination of. The first electrode 131 is formed on the substrate 110 in sub pixel units.

The second electrode 138 of the white organic light emitting diode 130 and the colored organic light emitting diode 140 is called a cathode and is formed of at least one layer structure using a transparent conductive material or an opaque conductive material, or It can be formed in a multi-layer structure of. The second electrode 138 is formed on the entire surface of the substrate 110.

 The first common layer 132 and the second common layer 133 of the white organic light emitting diode 130 and the colored organic light emitting diode 140 may transmit holes supplied from the first electrode 131 to the light emitting layer. The layer is positioned between the first electrode 131 and the first light emitting layer 134a. The first common layer 132 is made of a hole injection material, and the second common layer 133 is made of a hole transport material.

The third common layer 135 and the fifth common layer 137 are layers for lowering an energy barrier to facilitate injection and transport of electrons supplied from the second electrode 138. The third common layer 135 is positioned between the first light emitting layer 134a and the second light emitting layer 134b and is made of an electron transport material. The fifth common layer 137 is positioned between the second light emitting layer 134b or the third light emitting layer 134c and the second electrode 138 and may be made of an electron transporting material, an electron injection material, or a combination thereof. The third common layer 135 constitutes the white organic light emitting device 130 and the colored organic light emitting device 140, but the fifth common layer 137 comprises only the white organic light emitting device 130.

The fourth common layer 136 is a layer for increasing the current efficiency generated in the light emitting layers stacked in series by generating charge, that is, electrons and holes in the white organic light emitting element 130, and the first light emitting layer 134a. ) And the second light emitting layer 134b. The fourth common layer 136 may be formed of a hole injection material, a hole transport material, an electron injection material, a blocking material, or a charge generating material, or a combination of these materials or a stacked structure.

The first light emitting layer 134a, the second light emitting layer 134b, and the third light emitting layer 134c may be formed of a host material and a dopant material to emit light between the first electrode 131 and the second electrode 138. The first light emitting layer 134a is positioned between the second common layer 133 and the third common layer 135 and is made of a blue, green, yellow, or red color developing material. Can be. Since the colored organic light emitting diode 140 includes only the first light emitting layer 134a, the first light emitting layer 134a is preferably made of a blue color emitting material.

The second light emitting layer 134b is positioned between the fourth common layer 136 and the fifth common layer 137 and may be made of a material that emits blue, green, yellow, or red colors. When the first light emitting layer 134a is made of a material that emits blue color, the second light emitting layer 134b is made of a material that emits yellow or red color. In this case, the second emission layer 134b may be formed of a mixed color material, and specifically, may be formed of a green color material and a red color material, or may be mixed with a green color material and a yellow color material.

The third light emitting layer 134c may be positioned between the second light emitting layer 134b and the fifth common layer 137 and may be omitted depending on the color material forming the first light emitting layer 134a and the second light emitting layer 134b. The third light emitting layer 134c may be made of a material emitting blue, green, yellow, or red, or a combination thereof.

The color light-emitting material of the first light emitting layer 134a, the second light emitting layer 134b, and the third light emitting layer 134c is not limited to the above-described materials and combinations thereof, and the white organic light emitting diode 130 emits white light. And the colored organic light emitting device 140 may emit any color other than white light, for example, black light.

That is, the light emitting layers 134a, 134b, and 134c of the white organic light emitting diode 130 may be formed of a blue color material and a yellow color material, but may be formed of a blue color material and a red color material, or may be formed of a blue color material and a red color material. It is preferably made of a green coloring material, or made of a blue coloring material, a green coloring material, and a yellow coloring material, or a blue coloring material, a green coloring material, a yellow coloring material, and a red coloring material. The light emitting layer 134a of the colored organic light emitting diode 140 may be formed of a blue color emitting material.

Meanwhile, in FIG. 2, the colored organic light emitting diode 140 is illustrated as being formed on one side of the white organic light emitting diode 130 in one unit pixel, but the colored organic light emitting diode 140 is intended to be implemented. It may be formed on the other side of the white organic light emitting device 130 according to the panel. In addition, the colored organic light emitting diode 140 may be formed at the center between the white organic light emitting diodes 130 or at the edges of the unit pixels that are both sides of the white organic light emitting diode 130.

A common layer may be further formed between the second light emitting layer 134b and the third light emitting layer 134c.

3 is a cross-sectional view illustrating an organic light emitting display device according to a second embodiment of the present invention. The organic light emitting diode display according to the second exemplary embodiment of the present invention includes the white organic light emitting diode and the colored organic field of the first embodiment except for the positions of the white organic light emitting diode 230 and the colored organic light emitting diode 240. Since it corresponds to the structure of the light emitting device, a description thereof will be omitted.

The white organic light emitting diodes 230 of the organic light emitting diode display according to the second exemplary embodiment of the present invention are formed on the substrate 210 with a colored organic light emitting diode 240 interposed therebetween. That is, the three sub-pixels constituting one unit pixel are made of only the white organic light emitting diodes 230 or only the colored organic light emitting diodes 240.

 4 is a cross-sectional view illustrating an organic light emitting display device according to a third embodiment of the present invention. The organic light emitting diode display according to the third exemplary embodiment of the present invention has the white organic light emitting diode and the colored organic field except for the positions of the white organic light emitting diode 330 and the colored organic light emitting diode 340. Since it corresponds to the structure of the light emitting device, a description thereof will be omitted.

The white organic light emitting diodes 330 of the organic light emitting diode display according to the third exemplary embodiment of the present invention are formed on the entire surface except for the edge of the substrate 310, and the colored organic light emitting diodes 340 are formed on the substrate 310. It is formed on the outer edge. In this case, the colored organic light emitting diode 340 may be formed on the outer edge of the substrate 310 as one unit pixel or on the outer edge of the substrate 310 as one sub pixel.

As described above, the organic light emitting display device according to the present invention can implement a high resolution panel by including a white organic light emitting device in one unit pixel or in one panel, and can also display information or display lines by providing a colored organic light emitting device. You can do Furthermore, the structure in which the white organic light emitting diodes and the colored organic light emitting diodes are mixed is more effective in utilizing patient information or displaying specifics when used as a medical display.

Hereinafter, a method of manufacturing the organic light emitting display device of the present invention will be described. 5A through 5C are cross-sectional views illustrating a manufacturing process of the OLED display illustrated in FIG. 2.

Referring to FIG. 5A, a substrate 110 defined as a white organic light emitting diode region and a colored organic light emitting diode region is prepared. Next, the first electrode 131, the first common layer 132, the second common layer 133, the first emission layer 134a and the third common layer are formed on the substrate 110 using the first mask 150. Layers 134 are deposited one after the other. A cell driver (not shown) for driving the organic light emitting diode may be formed on the substrate 110.

The first mask 150 includes an open region 150a and a blocking region 150b, and the open region 150a is open to the entire region where the organic light emitting diode is to be formed.

The first electrode 131 is an electrode for hole injection. The first electrode 131 has a high work function and is formed of a transparent conductive layer so that light emitted from the light emitting layer can come out of the device. As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or these It is formed by the combination of. The first electrode 131 is formed on the substrate 110 in sub pixel units.

The first common layer 132 and the second common layer 133 are layers for transferring holes supplied from the first electrode 131 to the light emitting layer, and are formed next to the first electrode 131. The first common layer 132 is formed of a hole injection material and the second common layer 133 is formed of a hole transport material.

The first emission layer 134a is a layer that emits light by being made of a host material and a dopant material, and may be formed of a blue, green, yellow, or red color developing material. The first light emitting layer 134a is preferably formed of a blue color emitting material. The third common layer 135 is a layer for smoothly injecting and transporting electrons to the first light emitting layer 134a and is formed of an electron transporting material after the first light emitting layer 134a is formed.

Referring to FIG. 5B, the fourth common layer 136, the second emission layer 134b, the third emission layer 134c, and the fifth common layer 137 are sequentially deposited using the second mask 160. The second mask 160 includes an open region 160a and a blocking region 160b, and the open region 160a is open only to the white organic light emitting diode region.

The fourth common layer 136 is a layer for increasing the current efficiency generated in the light emitting layers stacked in series by generating charges, that is, electrons and holes in the organic light emitting device, and is formed between the light emitting layers. The fourth common layer 136 is formed in the white organic light emitting diode region exposed by the open region 160a of the second mask 160.

The fourth common layer 136 is formed of a hole injection material, a hole transport material, an electron injection material, a blocking material, or a charge generating material in the third common layer 135 of the white organic light emitting device region, or a combination thereof. It can be formed of a material or a stacked structure thereof.

The second light emitting layer 134b and the third light emitting layer 134c are formed on the fourth common layer 136 of the white organic light emitting diode region according to the color forming material forming the first light emitting layer 134a. For example, when the first light emitting layer 134a is formed of a blue light emitting material, the second light emitting layer 134b and the third light emitting layer 134c may be formed of a green light emitting material and a red light emitting material, or a green light emitting material and a yellow light emitting material. It can be formed as.

One light emitting layer of the second light emitting layer 134b and the third light emitting layer 134c may be omitted. For example, when the first light emitting layer 134a is formed of a blue light emitting material, one light emitting layer of the second light emitting layer 134b and the third light emitting layer 134c may be formed of a red light emitting material or a yellow light emitting material. have.

One light emitting layer of the second light emitting layer 134b and the third light emitting layer 134c may be formed by mixing two color emitting materials. For example, when the first light emitting layer 134a is formed of a blue color developing material, the second light emitting layer 134b and the third light emitting layer 134c may be formed of a red color developing material, a green color developing material, and a yellow color developing material.

The color generating material constituting the first light emitting layer 134a, the second light emitting layer 134b, and the third light emitting layer 134c is not limited to the above-described materials and combinations thereof, and the open region 160a of the second mask 160 is provided. The light emitting device may emit white light in an area corresponding to and emit light other than white light in an area corresponding to the open area 150a of the first mask 150.

Meanwhile, a common layer may be further formed between the second light emitting layer 134b and the third light emitting layer 134c.

The fifth common layer 137 may be formed of an electron transport material, an electron injection material, or a combination thereof in the second emission layer 134b or the third emission layer 134c of the white organic light emitting diode region.

Referring to FIG. 5C, an organic light emitting display device including a white organic light emitting diode 130 and a colored organic light emitting diode 140 may be formed by using the first mask 150 again to form a second electrode 138. To prepare. The second electrode 138 is formed of at least one layer structure using a transparent conductive material or an opaque conductive material or formed on the entire surface of the substrate 110 in a multilayer structure thereof.

Since the open area 150a of the first mask 150 is open to the entire region where the organic light emitting diode is to be formed, the second electrode 138 is the fifth common layer 137 forming the white organic light emitting diode 130. And a third common layer 135 forming the colored organic light emitting device 140.

According to the application of the second mask 160 and the design of the open area 160a, the positions of the white organic light emitting diode 130 and the colored organic light emitting diode 140 may be specified. The colored organic light emitting diode 140 is formed in the open region 150a of the first mask, and the white organic electroluminescent device 130 is formed in the open region 160a of the second mask.

As described above, the method of manufacturing the organic light emitting display device according to the present invention may be provided by mixing a white organic light emitting diode and a colored organic light emitting diode in one unit pixel or in one panel. As a result, not only a high-resolution panel can be realized but also a color organic light emitting device can be used to display information or display a leader. In addition, the manufacturing method of the organic light emitting display device according to the present invention does not use the conventional fine metal mask, so there is no fear of misalignment, and the yield does not cause defects such as scratches on the substrate by the fine metal mask. Can be improved.

Meanwhile, although the fifth common layer 137 is described as being deposited using the second mask 160, the fifth common layer 137 is formed on the entire surface of the substrate 110 using the first mask 150. Can be formed. The colored organic light emitting diode 140 may be displayed in black.

The above-described techniques represent presently preferred embodiments, and the present invention is not limited to the above-described embodiments and the accompanying drawings. Modifications and other uses of the embodiments will be apparent to those skilled in the art, and such changes and other uses are defined by the scope of the claims contained within or appended to the spirit of the invention.

1 is a cross-sectional view illustrating a method of manufacturing an organic light emitting diode according to the related art.

2 is a cross-sectional view illustrating an organic light emitting display device according to a first embodiment of the present invention.

3 is a cross-sectional view illustrating an organic light emitting display device according to a second embodiment of the present invention.

4 is a cross-sectional view illustrating an organic light emitting display device according to a third embodiment of the present invention.

5A through 5C are cross-sectional views illustrating a manufacturing process of the OLED display illustrated in FIG. 2.

6A to 6D are views for explaining a mask used in the manufacturing process of FIGS. 5A to 5C.

<< Explanation of symbols for main part of drawing >>

130, 230, and 330: white organic light emitting diodes 131: first electrode

134a: first light emitting layer 134b: second light emitting layer

134c: third light emitting layer 138: second electrode

140, 240, and 340: colored organic light emitting diodes 150: first mask

160: second mask

Claims (10)

Preparing a substrate defined by a white organic light emitting diode region and a colored organic light emitting diode region; Sequentially depositing a first electrode, a first common layer, a second common layer, a first light emitting layer, and a third common layer on the entire surface of the substrate using a first mask; Sequentially depositing a fourth common layer, a second emission layer, and a fifth common layer on a third common layer of the white organic light emitting device region by using a second mask; And And forming a second electrode on the entire surface of the substrate using the first mask. The method of claim 1, wherein the first mask is opened with respect to the white organic light emitting device region and the colored organic light emitting device region, And the second mask is opened only in the white organic light emitting device region. The display panel of claim 1, wherein the second electrode is formed on the fifth common layer of the white organic light emitting diode region. And a third common layer in the colored organic light emitting element region. The method of claim 1, further comprising depositing a third emission layer between the second emission layer and the second electrode by using the second mask. The method of claim 1, wherein the first emission layer is formed of a blue color emitting material. The organic light emitting diode of claim 1, wherein the organic light emitting diode formed in the white organic light emitting diode region includes a light emitting layer made of a blue color material and a yellow color material. A light emitting layer comprising a blue color material and a red color material, or A light emitting layer comprising a blue color material, a red color material and a green color material, or A light emitting layer comprising a blue color material and a green color material and a yellow color material, or A method of manufacturing an organic light emitting display device, comprising: a light emitting layer comprising a blue color material, a green color material, a yellow color material, and a red color material. A substrate defined by a white organic light emitting diode region and a colored organic light emitting diode region; A first electrode, a first common layer, a second common layer, a first light emitting layer, a third common layer, a fourth common layer, a second light emitting layer, a fifth common layer, and a second electrode are stacked on the white organic light emitting device region. A white organic electroluminescent device formed; And An organic light emitting display device comprising a colored organic light emitting diode that is formed by stacking a first electrode, a first common layer, a second common layer, a first light emitting layer, a third common layer, and a second electrode on the colored organic light emitting element region. . The organic light emitting display device of claim 7, wherein the colored organic light emitting diode is formed at an edge of a substrate or a center of the substrate. The organic light emitting diode display of claim 7, wherein the white organic light emitting diode further comprises a third emission layer between the second emission layer and the second electrode. The method of claim 7, wherein the first light emitting layer is made of a blue color material, The second light emitting layer is made of one of a yellow color material and a red color material, or The second light emitting layer is formed of a mixture of a green color material and a red color material, a mixture of green color material and a yellow color material, and a mixture material of one of green color material, yellow color material, and red color material. An organic light emitting display device, characterized in that.

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