KR101611905B1 - Organic Light Emitting Display Device and Manufacturing Method of the Same - Google Patents

Abstract

The present invention relates to an organic light emitting diode (OLED) display device capable of easily achieving black or white in a specific position and improving yield, and a method of manufacturing the same, A first common layer, a second common layer, a first luminescent layer, and a third common layer in this order on the entire surface of the substrate using a first mask Depositing a fourth common layer, a second light emitting layer, and a fifth common on the third common layer of the white organic electroluminescent device region by using a second mask, And forming a second electrode using the second electrode.

OLED, mask, white, luminescent layer, deposition

Description

Technical Field [0001] The present invention relates to an organic light emitting display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display and a method of manufacturing the same, and more particularly, to an organic light emitting display and a method of manufacturing the same.

The image display device that realizes various information on the screen is a core technology of the information communication age and it is becoming thinner, lighter, more portable and higher performance. Accordingly, an organic light emitting display device for displaying an image by controlling the amount of light emitted from the organic light emitting layer by using a flat panel display capable of reducing weight and volume, which is a disadvantage of a cathode ray tube (CRT) The OLED display is a self-luminous device using a thin light emitting layer between electrodes, and has an advantage that it can be thinned like a paper.

In an active matrix organic light emitting display device (AMOLED), pixels composed of three color (R, G, B) sub-pixels are arranged in a matrix form to display an image. Each sub-pixel includes an organic electroluminescent element and a cell driver for independently driving the organic electroluminescent element. 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 electroluminescent device is composed of an electrode and an organic luminescent layer, and the organic luminescent layer is composed of a common layer and a luminescent layer. Conventionally, an organic electroluminescent device has been manufactured with R, G, and B sub-pixel units 30 on a substrate 10 using a fine metal mask 50 as shown in FIG. Alternatively, in order to improve the luminous efficiency of the organic electroluminescent device, a shadow mask is used to deposit white sub-pixel units on the substrate and color filters of R, G, and B are added.

However, when a white organic electroluminescent device is implemented using a fine metal mask, there is a limit to reduce the size of the open region such that the cut-off region between the open regions of the fine metal mask is bent or cut and misaligned easy. In addition, scratches are generated on the substrate by fine metal masks, resulting in defects, thereby lowering the yield.

In the case of implementing a white organic electroluminescent device using a shadow mask, white organic electroluminescent devices are uniformly applied to the entire panel, so that the same color is displayed as a whole, so that individual information can not be displayed or the leader can not be displayed. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an organic light emitting display device and a method of manufacturing the same, which can easily realize a black or white display at a specific position and improve a yield.

A method of manufacturing an organic light emitting display according to the present invention includes the steps of preparing a substrate defined by a white organic electroluminescent element region and a colored organic electroluminescent element region, A first common layer, a second common layer, a first light emitting layer, and a third common layer in this order on the first common layer of the white organic electroluminescent device region; Emitting layer and a fifth common are sequentially deposited on the substrate and a second electrode is formed on the entire surface of the substrate using the first mask.

Here, the first mask is opened to the white organic electroluminescent element region and the colored organic electroluminescent element region, and the second mask is opened only to the white organic electroluminescent element region.

And the second electrode is formed in the fifth common layer of the white organic electroluminescent element region and is formed in the third common layer of the colored organic electroluminescent element region.

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

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

The organic electroluminescent device formed in the white organic electroluminescent device region may include a light emitting layer composed of a blue coloring material and a yellow coloring material or a light emitting layer composed of a blue coloring material and a red coloring material, And a light emitting layer made of a green coloring material or a light emitting layer made of a blue coloring material, a green coloring material and a yellow coloring material, or a light emitting layer made of a blue coloring material, a green coloring material, a yellow coloring material and a red coloring material .

The organic electroluminescent display device according to the present invention includes a substrate defined as a white organic electroluminescent element region and a colored organic electroluminescent element region, a first electrode, a first common layer, a second common layer, A white organic electroluminescent device formed by stacking a first electrode, a first common electrode, a second common electrode, a first common electrode, a first common electrode, a first common electrode, a first common electrode, A second common layer, a first light emitting layer, a third common layer, and a second electrode.

The colored organic electroluminescent device is formed at the edge of the substrate or the center of the substrate.

Wherein the first light emitting layer is formed of a blue coloring material and the second light emitting layer is formed of one of a yellow coloring material and a red coloring material or the second light emitting layer is formed of a mixture of a green coloring material and a red coloring material, A mixed material of a coloring material and a yellow coloring material, and a mixed material of a green coloring material, a yellow coloring material, and a red coloring material.

Since the present invention can be manufactured without using a fine metal mask, the defective substrate can be prevented and the yield can be improved. In addition, the color filter addition process can be omitted, and the process cost can be reduced.

Further, the present invention can form a colored or white organic electroluminescent device at a desired position, thereby realizing a high-resolution panel, and displaying information or leader lines.

In addition, the present invention is effective for use in the utilization of patient information, special indication, and the like when used as a medical display.

Hereinafter, the organic light emitting diode display and the 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 OLED display according to a first embodiment of the present invention.

The organic light emitting diode display according to the first embodiment of the present invention includes a substrate 110 defined as a white organic electroluminescent element region and a colored organic electroluminescent element region, And electroluminescent elements 130 and 140. The organic electroluminescent devices 130 and 140 are layers in which an exciton formed by the combination of holes and electrons injected by the first electrode 131 and the second electrode 138 falls to a ground state and emits light, A white organic electroluminescent device 130 and a colored organic electroluminescent device 140.

In the first embodiment of the present invention, the three sub-pixels constitute one unit pixel, the two sub-pixels in one unit pixel constitute the white organic electroluminescent device 130, and one sub- Device 140 as shown in FIG. A white organic electroluminescent device 130 is formed in the white organic electroluminescent device region of the substrate 110 and a colored organic electroluminescent device 140 is formed in the colored organic electroluminescent device region.

The white organic electroluminescent device 130 is an organic electroluminescent device that emits white light and includes a first electrode 131 sequentially stacked, a first common layer 132, a second common layer 133, 1 light emitting layer 134a, a third common layer 135, a fourth common layer 136, a second light emitting layer 134b, a third light emitting layer 134c, a fifth common layer 137, Two electrodes 138 are formed.

The colored organic electroluminescent device 140 is an organic electroluminescent device that emits non-white colored light, and sequentially includes a first electrode 131, a first common layer 132, a second common layer 133, A first emission layer 134a, a third common layer 135, and a second electrode 138. [

The white organic electroluminescent device 130 and the first electrode 131 of the colored organic electroluminescent device 140 are electrodes for hole injection and are called anodes and have high work function as electrodes for hole injection, The transparent conductive layer is formed so that light emitted from the light emitting layer can be emitted outside the device. As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO) . The first electrode 131 is formed on the substrate 110 in units of sub-pixels.

The white organic electroluminescent device 130 and the second electrode 138 of the colored organic electroluminescent device 140 are referred to as a cathode and may be formed of at least one layer structure using a transparent conductive material or an opaque conductive material, Layer structure. 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 electroluminescent device 130 and the colored organic electroluminescent device 140 are arranged to transmit the holes supplied from the first electrode 131 to the light emitting layer Layer is located between the first electrode 131 and the first emission layer 134a. The first common layer 132 is made of a hole injecting material and the second common layer 133 is made of a hole transporting material.

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

The fourth common layer 136 is a layer for increasing electric current efficiency generated in the light emitting layer which is serially stacked by generating charges, that is, electrons and holes, in the white organic electroluminescent device 130. The first common light emitting layer 134a ) And the second light emitting layer 134b. The fourth common layer 136 may be composed of a hole injecting material, a hole transporting material, an electron injecting material, a blocking material, a charge generating material, or a combination thereof or a laminated structure.

The first light emitting layer 134a, the second light emitting layer 134b and the third light emitting layer 134c are formed of a host material and a dopant material and emit light between the first electrode 131 and the second electrode 138. The first light emitting layer 134a is disposed between the second common layer 133 and the third common layer 135 and is formed of a coloring material of blue, green, yellow or red. . Since the colored organic electroluminescent device 140 includes only the first emission layer 134a, it is preferable that the first emission layer 134a is formed of a blue coloring material.

The second light emitting layer 134b is disposed between the fourth common layer 136 and the fifth common layer 137 and may be formed of a material that develops blue, green, yellow, or red. When the first light emitting layer 134a is made of a substance that emits blue light, the second light emitting layer 134b is made of a material that develops yellow or red. Here, the second light emitting layer 134b may be formed of a mixed coloring material, specifically, a mixture of a green coloring material and a red coloring material, or a mixture of a green coloring material and a yellow coloring material.

The third light emitting layer 134c is located between the second light emitting layer 134b and the fifth common layer 137 and may be omitted depending on the coloring material forming the first light emitting layer 134a and the second light emitting layer 134b. The third light emitting layer 134c may be formed of a material that develops blue, green, yellow, or red, or may be formed of a combination of these materials.

The coloring 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 materials and combinations thereof. The white organic light emitting device 130 may emit white light And the organic electroluminescent device 140 can emit a color other than white light, for example, black light.

That is, the light emitting layers 134a, 134b, and 134c of the white organic electroluminescent device 130 are formed of a blue coloring material and a yellow coloring material, and a blue coloring material and a red coloring material, A green coloring material, 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 electroluminescent device 140 is preferably made of a blue coloring material.

2, the colored organic electroluminescent device 140 is formed on one side of the white organic electroluminescent device 130 in one unit pixel, The white organic electroluminescent device 130 may be formed on the other side of the white organic electroluminescent device 130. The colored organic electroluminescent device 140 may be formed at the center between the white organic electroluminescent devices 130 or may be formed at the edge of the unit pixel on both sides of the white organic electroluminescent device 130.

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

3 is a cross-sectional view illustrating an OLED display according to a second embodiment of the present invention. The organic light emitting display according to the second embodiment of the present invention includes the white organic electroluminescent device of the first embodiment and the organic electroluminescent device of the first embodiment except for the positions of the white organic electroluminescent device 230 and the colored organic electroluminescent device 240. [ And thus the description thereof will be omitted.

The white organic electroluminescent devices 230 of the organic light emitting display according to the second embodiment of the present invention are formed on the substrate 210 with the colored organic electroluminescent device 240 therebetween. That is, the three sub-pixels constituting one unit pixel are formed only by the white organic electroluminescent devices 230 or only the colored organic electroluminescent devices 240.

 4 is a cross-sectional view illustrating an OLED display according to a third embodiment of the present invention. The organic light emitting display according to the third embodiment of the present invention includes the white organic electroluminescent device of the first embodiment and the organic electroluminescent device of the first embodiment except for the positions of the white organic electroluminescent device 330 and the colored organic electroluminescent device 340. [ And thus the description thereof will be omitted.

The white organic electroluminescent devices 330 of the organic light emitting display according to the third embodiment of the present invention are formed on the entire surface excluding the edge of the substrate 310 and the colored organic electroluminescent devices 340 are formed on the entire surface of the substrate 310 And is formed at the outer edge. At this time, the colored organic electroluminescent device 340 may be formed at the outer edge of the substrate 310 as one unit pixel, or may be formed at the outer edge of the substrate 310 as one sub-pixel.

As described above, the organic light emitting diode display according to the present invention includes a white organic electroluminescent element in one unit pixel or one panel, thereby realizing a high-resolution panel. In addition, since the organic electroluminescent element is provided, . Furthermore, a structure in which a white organic electroluminescent device and a colored organic electroluminescent device are mixed is more effective in utilizing patient information or specific indication when utilized as a medical display.

Hereinafter, a method for manufacturing an organic light emitting display device of the present invention will be described. 5A to 5C are cross-sectional views illustrating a manufacturing process of the organic light emitting display shown in FIG.

Referring to FIG. 5A, a substrate 110 defined as a white organic electroluminescent element region and a colored organic electroluminescent element region is prepared. Next, the first electrode 131, the first common layer 132, the second common layer 133, the first light emitting layer 134a, and the third common layer 132 are formed on the substrate 110 using the first mask 150. Next, Layer 134 in this order. The substrate 110 may have a cell driver (not shown) for driving the organic electroluminescent device.

The first mask 150 has an open region 150a and a blocking region 150b and the open region 150a is open to the entire region where the organic electroluminescence device is to be formed.

The first electrode 131 is an electrode for hole injection, and is formed of a transparent conductive layer so that the work function is high and light emitted from the light emitting layer can be emitted outside the device. As the transparent conductive layer, indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO) . The first electrode 131 is formed on the substrate 110 in units of sub-pixels.

The first common layer 132 and the second common layer 133 are formed next to the first electrode 131 to transmit the holes supplied from the first electrode 131 to the light emitting layer. The first common layer 132 is formed of a hole injecting material and the second common layer 133 is formed of a hole transporting material.

The first light emitting layer 134a is formed of a host material and a dopant material and emits light. The first light emitting layer 134a may be formed of a blue, green, yellow or red coloring material. The first light emitting layer 134a is preferably formed of a blue coloring material. The third common layer 135 is a layer for facilitating injection and transport of electrons into the first light emitting layer 134a, and is formed of an electron transporting material after the formation of the first light emitting layer 134a.

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

The fourth common layer 136 is formed between the light emitting layers as a layer for increasing electric current efficiency generated in the light emitting layer which is formed by serially stacking charges, that is, electrons and holes, inside the organic electroluminescent device. The fourth common layer 136 is formed in the white organic electroluminescent element region exposed by the open area 160a of the second mask 160. [

The fourth common layer 136 may be formed of a hole injecting material, a hole transporting material, an electron injecting material, a blocking material, or a charge generating material in the third common layer 135 of the white organic electroluminescent device region, Materials or stacked structures thereof.

The second light emitting layer 134b and the third light emitting layer 134c are formed in accordance with the coloring material forming the first light emitting layer 134a in the fourth common layer 136 of the white organic electroluminescent device region. For example, when the first light emitting layer 134a is formed of a blue coloring material, the second light emitting layer 134b and the third light emitting layer 134c may be formed of a green coloring material and a red coloring material or a green coloring material and a yellow coloring material As shown in FIG.

One 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 coloring material, one of the second light emitting layer 134b and the third light emitting layer 134c may be formed of a red coloring material or a yellow coloring material have.

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

The coloring material forming 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, but may be an open region 160a of the second mask 160, It is possible to emit white light in the region corresponding to the open region 150a of the first mask 150 and to emit the non-white light in the region corresponding to the open region 150a of the first mask 150. [

On the other hand, a common layer may be additionally 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 transporting material or an electron injecting material in the second light emitting layer 134b or the third light emitting layer 134c of the white organic electroluminescent device region, or may be formed of a combination thereof.

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

Since the open region 150a of the first mask 150 is open to the entire region where the organic electroluminescent device is to be formed, the second electrode 138 is electrically connected to the fifth common layer 137 And is formed on the third common layer 135 constituting the color organic electroluminescent device 140. [

The position of the white organic electroluminescent device 130 and the color organic electroluminescent device 140 can be specified according to the application of the second mask 160 and the design of the open area 160a. A colored organic electroluminescent device 140 is formed in the open region 150a of the first mask and a white organic electroluminescent device 130 is formed in the open region 160a of the second mask.

As described above, the method of manufacturing an organic light emitting display according to the present invention may include a white organic electroluminescent element and a colored organic electroluminescent element in a single unit pixel or in one panel. As a result, it is possible to realize a high-resolution panel and to display an information display or a leader by providing a colored organic electroluminescent device. In addition, since the conventional method of manufacturing an organic light emitting display device according to the present invention does not use a fine metal mask, there is no fear of misalignment, scratches are generated on the substrate by a fine metal mask, Can be improved.

Although the fifth common layer 137 is described above as being deposited using the second mask 160, the fifth common layer 137 is formed on the front surface of the substrate 110 using the first mask 150 . The colored organic electroluminescent device 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 modifications and other uses are intended to be included within the spirit of the present invention or defined by the scope of the appended claims.

1 is a cross-sectional view illustrating a conventional method for manufacturing an organic electroluminescent device.

2 is a cross-sectional view illustrating an OLED display according to a first embodiment of the present invention.

3 is a cross-sectional view illustrating an OLED display according to a second embodiment of the present invention.

4 is a cross-sectional view illustrating an OLED display according to a third embodiment of the present invention.

5A to 5C are cross-sectional views illustrating a manufacturing process of the organic light emitting display shown in FIG.

Figs. 6A to 6D are views for explaining masks used in the manufacturing process of Figs. 5A to 5C. Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

130, 230, 330: white organic electroluminescent device 131: first electrode

134a: First light emitting layer 134b: Second light emitting layer

134c: third light emitting layer 138: second electrode

140, 240, 340: colored organic electroluminescent device 150: first mask

160: Second mask

Claims (10)

Preparing a substrate defined as a white organic electroluminescent element region and a colored organic electroluminescent element 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 light emitting layer, and a fifth common to a third common layer of the white organic electroluminescent device region using a second mask; And And forming a second electrode on the entire surface of the substrate using the first mask. 2. The organic electroluminescent device according to claim 1, wherein the first mask is open to the white organic electroluminescent element region and the colored organic electroluminescent element region, Wherein the second mask is open only to the white organic electroluminescent element region. The organic electroluminescent device according to claim 1, wherein the second electrode is formed in the fifth common layer of the white organic electroluminescent device region, Wherein the third common layer of the colored organic electroluminescent device region is formed on the third common layer. The method of claim 1, further comprising depositing a third light emitting layer between the second light emitting layer and the second electrode using the second mask. The method of claim 1, wherein the first light emitting layer is formed of a blue coloring material. The organic electroluminescent device according to claim 1, wherein the organic electroluminescent device formed in the white organic electroluminescent device region comprises a light emitting layer comprising a blue coloring material and a yellow coloring material, A light emitting layer made of a blue coloring material and a red coloring material, A blue coloring material, a red coloring material and a green coloring material, A blue coloring material, a green coloring material and a yellow coloring material, Wherein the light emitting layer comprises a blue coloring material, a green coloring material, a yellow coloring material, and a red coloring material. A substrate defined as a white organic electroluminescent element region and a colored organic electroluminescent element region; The first common layer, the second common layer, the first light emitting layer, the third common layer, the fourth common layer, the second light emitting layer, the fifth common layer, and the second electrode in the white organic electroluminescent device region, A white organic electroluminescent device formed; And And a colored organic electroluminescent device 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 in the colored organic electroluminescent device region, Wherein the substrate has a plurality of unit pixels composed of three sub-pixels, Wherein one of the three sub-pixels is a colored organic electroluminescent element and the two sub-pixels are a white organic electroluminescent element. delete 8. The organic light emitting diode display according to claim 7, wherein the white organic electroluminescent device further comprises a third light emitting layer between the second light emitting layer and the second electrode. 8. The organic electroluminescent device according to claim 7, wherein the first light emitting layer is made of a blue coloring material, Wherein the second light emitting layer is made of one of a yellow coloring material and a red coloring material, The second light emitting layer may include a mixed material of a green coloring material and a red coloring material, a mixed material of a green coloring material and a yellow coloring material, and a mixed material of a green coloring material, a yellow coloring material, Emitting display device.

Images