KR100712100B1 - organic light emitting display device and manufacturing method of the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device and a method of manufacturing the same, wherein yellow pixels, cyan pixels, and magenta pixels are arranged between red pixels, green pixels, and blue pixels, respectively, and cyan light, magenta light, and red light, green light, and blue light. By reproducing yellow light, it is possible to display a near-real image by increasing the color reproduction range, to facilitate the process, and to increase the number of unit pixels for reproducing color, thereby increasing the area of the flat panel display device. .

Complementary color, cyan pixel, magenta pixel, yellow pixel.

Description

Organic light emitting display device and manufacturing method thereof

1 is a plan view schematically showing a pixel of an organic EL device according to the prior art;

2 is a color coordinate diagram showing a color gamut of an organic EL device according to the prior art.

3 is a plan view of the organic electroluminescent device according to the present invention limited to red (R), yellow (Y), green (G), cyan (C), blue (B) and magenta (M) unit pixels.

4 is a plan view schematically showing a pixel of an organic EL device according to the present invention;

5 is a timing diagram of an organic light emitting display device according to the present invention;

6 is a color coordinate diagram showing a color gamut of an organic electroluminescent device according to the present invention;

<Explanation of symbols for the main parts of the drawings>

100: cyan pixel 200: magenta pixel

300: yellow pixel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display device and a method of manufacturing the same, and more particularly, to an organic electroluminescence device capable of reproducing complementary colors other than the primary colors by arranging pixels that reproduce complementary colors between red, green, and blue pixels. A display element and its manufacturing method are related.

In general, the organic light emitting display device is a self-luminous display device, which has a wide viewing angle, excellent contrast, and fast response speed.

The organic light emitting diode includes a substrate, an anode disposed on the substrate, an emission layer (EML) positioned on the anode, and a cathode disposed on the emission layer. The driving principle of the organic light emitting device is as follows. When a voltage is applied between the anode and the cathode, holes are injected from the anode into the light emitting layer and electrons are injected from the cathode into the light emitting layer. The holes and electrons injected into the light emitting layer recombine in the light emitting layer to generate excitons, and the excitons emit light while transitioning from the excited state to the ground state.

In such an organic light emitting device, there is a method of forming the light emitting layers corresponding to each of the colors to realize full colors of red (R), green (G), and blue (B).

US Pat. No. 6,281,634 discloses a full color organic light emitting device in which light emitting layers corresponding to R, G, and B are formed. More specifically, the U.S. Patent discloses a full color organic electroluminescent device in which the light emitting layers are formed independently for each of R, G, and B colors, and in which other organic films except for the light emitting layers are formed in common.

The organic EL device may include a red pixel, a green pixel, and a blue pixel arranged as illustrated in FIG. 1, and may implement full color using the organic pixel.

However, when the color is reproduced using the R, G, and B pixels as described above, as shown in FIG. 2, the color within the triangular area formed by connecting the points of R, G, and B may be reproduced. There is a disadvantage that the color reproduction range is narrow because the color cannot be reproduced.

An object of the present invention is to solve the above problems of the prior art, by arranging the yellow pixels, cyan pixels and magenta pixels between red pixels, green pixels and blue pixels, respectively, in addition to red light, green light and blue light, cyan light and magenta light. And an organic electroluminescent display device capable of increasing a color reproduction range by reproducing even a gamut of yellow light, and a method of manufacturing the same.

In order to achieve the above object, the organic light emitting display device according to the present invention,

An organic light emitting display device having a first electrode and a second electrode and including an organic light emitting layer therebetween;

At least two thin film transistors for controlling the organic light emitting display device;

A plurality of scan signal lines for supplying scan signals to the thin film transistors;

A plurality of data signal lines for supplying data to the thin film transistors;

A pixel region defined by each of the scan signal lines and the data signal lines, the pixel region including the organic light emitting element;

Wherein the pixel region is provided in the order of red pixels, yellow pixels, green pixels, cyan pixels, blue pixels and magenta pixels,

The yellow pixel is provided with a red light emitting layer and a green light emitting layer at the same time,

The yellow pixel is provided in the order of the red light emitting layer and the green light emitting layer,

The cyanide pixel is provided with a green light emitting layer and a blue light emitting layer at the same time,

The cyanide pixel is provided in the order of the green light emitting layer and the blue light emitting layer,

The magenta pixel is provided with a blue light emitting layer and a red light emitting layer at the same time,

The magenta pixel may be provided in the order of the blue light emitting layer and the red light emitting layer.

In order to achieve the above object, a method of manufacturing an organic light emitting display device according to the present invention,

An organic light emitting display device having a first electrode and a second electrode and including an organic light emitting layer therebetween;

At least two thin film transistors for controlling the organic light emitting display device;

A plurality of scan signal lines for supplying scan signals to the thin film transistors;

A plurality of data signal lines for supplying data to the thin film transistors;

A pixel region defined by each of the scan signal lines and the data signal lines, the pixel region including the organic light emitting element;

In the pixel area is a manufacturing method of an organic light emitting display device arranged in the order of red pixels, yellow pixels, green pixels, cyan pixels, blue pixels and magenta pixels,

The light emitting layer of each pixel and the light emitting layer of the same color constituting the adjacent pixels are formed at the same time,

The yellow pixel is composed of a red light emitting layer and a green light emitting layer,

The cyanide is composed of a green light emitting layer and a blue light emitting layer,

The magenta pixel is composed of a blue light emitting layer and a red light emitting layer,

The green light emitting layer constituting the yellow pixel, green pixel and cyan pixel is formed at the same time,

The blue light emitting layer constituting the cyan pixel, the blue pixel and the magenta pixel is formed at the same time,

The red light emitting layer constituting the magenta pixel, the red pixel and the yellow pixel is formed at the same time,

The light emitting layer may be formed by a vacuum deposition method or a laser induced thermal imaging method using a fine metal mask.

Hereinafter, although not shown, a general method of manufacturing an organic light emitting display device will be described.

A transparent insulating substrate having red (R), green (G), and blue (B) unit pixel regions is provided. It is preferable to form a buffer film on the transparent insulating substrate. An active layer, a gate insulating film, a gate electrode, an interlayer insulating film, and a source / drain electrode are formed on the buffer film according to a conventional method. As a result, a pixel driving thin film transistor including an active layer, a gate electrode, and a source / drain electrode may be formed on each unit pixel region. In forming the gate electrode, data lines are formed together.

Subsequently, a passivation insulating film is formed on the substrate on which the pixel driving thin film transistor is formed, and a via hole exposing any one of source / drain electrodes of the pixel driving thin film transistor is formed in the passivation insulating film. The passivation insulating film is preferably formed of a silicon nitride film.

Subsequently, a first electrode material is stacked on the substrate on which the via hole is formed, and patterned to form a first electrode in each unit pixel region. The first electrode may be an anode or a cathode. When the first electrode is an anode, the first electrode may be formed using indium tin oxide (ITO) or indium zinc oxide (IZO), or aluminum-neodymium (AlNd) and ITO. It can be laminated | stacked and formed in order. Meanwhile, when the first electrode is a cathode, the first electrode may be formed using Mg, Ca, Al, Ag, Ba, or an alloy thereof.

Subsequently, it is preferable to form a pixel defining layer having an opening that exposes a part of the surface of the first electrode on the first electrode. The pixel defining layer having the opening serves to define a light emitting area. The pixel defining layer is preferably formed of one material selected from the group consisting of acrylic resin, BCB (benzocyclobutene) and PI (polyimide).

Next, an organic layer including at least a light emitting layer is formed on a surface of the first electrode exposed to the pixel defining layer. The organic film layer may further include a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer as necessary. The light emitting layer may be formed of a red, green, and blue light emitting layer, and phosphorescent or fluorescent materials may be used.

The red light emitting layer includes CBP (carbazole biphenyl) or mCP as a host material, PIQIr (acac) (bis (1-phenylisoquinoline) acetylacetonate iridium), PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium as a dopant material ), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) is formed using a phosphor containing one or more selected from the group consisting of. In addition, the red light emitting layer may be formed using a fluorescent material such as PBD: Eu (DBM) 3 (Phen) or perylene.

The green light emitting layer includes CBP or mCP as a host material and is formed using a phosphor including Ir (ppy) 3 (fac tris (2-phenylpyridine) iridium) as a dopant material. In addition, the green light emitting layer may be formed using a fluorescent material such as Alq3 (tris (8-hydroxyquinolino) aluminum).

The blue light emitting layer is a fluorescent material including one material selected from the group consisting of DPVBi, Spiro-DPVBi, Spiro-6P, distilbene (DSB), distyrylarylene (DSA), PFO-based polymer and PPV-based polymer Is formed using. When the blue light emitting layer is formed of a phosphor, optical properties are unstable and are formed using the above-described fluorescent materials.

Forming the light emitting layers for each unit pixel region may be performed by vacuum deposition using a fine metal mask or laser induced thermal imaging.

Next, a second electrode is formed. The second electrode may be an anode or a cathode. When the second electrode is an anode, the second electrode may be formed using indium tin oxide (ITO) or indium zinc oxide (IZO), or aluminum-neodymium (AlNd) and ITO. It can be laminated | stacked and formed in order. On the other hand, when the second electrode is a cathode, it can be formed using Mg, Ca, Al, Ag, Ba or alloys thereof.

3 is a plan view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention, in which scan lines 125 arranged in one direction, data lines 135 and the scan lines 125 are insulated from and intersected with the scan lines 125. ) Are insulated from each other and parallel to each other and parallel to the data line 135. The unit pixel is defined by the intersection of the scan line 125 and the data line 135. The scan line 125 selects a unit pixel to be driven, and the data line 135 serves to apply a data signal to the selected unit pixel.

Each unit pixel includes a switching thin film transistor 140 for switching a data signal applied to the data line 135 according to a signal applied to the scan line 125, and data input through the switching thin film transistor 140. For example, the organic light emitting diode is configured by receiving a signal based on a capacitor 145 that accumulates a charge according to a data voltage and a voltage difference applied to the common power line 131, and a charge that is accumulated in the capacitor 145. The pixel driving thin film transistor 150 which flows current to the display element 240 is positioned. The organic light emitting display device 240 includes a pixel electrode 170 and a light emitting layer electrically connected to each other through the pixel electrode 170 and the opening 175a. The openings 175a are arranged in the order of red pixel (R), yellow pixel (C), green pixel (G), cyan pixel (C), blue pixel (B), and magenta pixel (M) as unit pixel regions. have.

4 is a plan view schematically illustrating a pixel array of an organic light emitting diode according to an exemplary embodiment of the present invention, and schematically illustrates only a pixel area of the organic light emitting diode display of FIG. 3.

The organic electroluminescent device includes red pixels (R), yellow pixels (Y, 300), green pixels (G), cyan pixels (C, 100), blue pixels (B), and magenta pixels (M, 200) in that order. It is arranged repeatedly. The red pixel (R) is composed of a red light emitting layer, the yellow pixel (Y) is composed of a red and green light emitting layer, and the green pixel (G) is composed of only a green light emitting layer. In addition, the cyan pixel (C) is composed of a green and blue light emitting layer, the blue pixel (B) is composed of only a blue light emitting layer and the magenta pixel (M) is composed of a blue and red light emitting layer. In this case, the light emitting layer provided in each pixel is provided with the same kind of light emitting layer provided in the adjacent pixel. That is, the yellow pixel Y arranged between the red pixel R and the green pixel G is provided in the order of the red light emitting layer and the green light emitting layer, and cyan arranged between the green pixel G and the blue pixel B. The pixel C is provided in the order of the green light emitting layer and the blue light emitting layer, and the magenta pixel M arranged between the blue pixel B and the red pixel R is provided in the order of the blue light emitting layer and the red light emitting layer. Here, the light emitting layers may be formed using a vacuum deposition method or a laser induced thermal imaging method using a fine metal mask as described above, and the light emitting layer is provided because the same kind of light emitting layers are provided in adjacent pixels. Is easy to form. For example, when the green light emitting layer is formed, the green light emitting layer of yellow pixels (Y), green pixels (G), and cyan pixels (C) may be simultaneously formed. In addition, when the blue light emitting layer is formed, the blue light emitting layer of the cyan pixel (C), the blue pixel (B), and the magenta pixel (M) may be formed at the same time. When the red light emitting layer is formed, the magenta pixel (M) and the red color may be formed. The red light emitting layers constituting the pixel R and the yellow pixel Y can be formed at the same time.

5 is a timing diagram of an organic light emitting display device according to an exemplary embodiment of the present invention, and a switching thin film transistor for switching a signal applied to a data line according to a signal applied to a scan line and a data signal input through the switching thin film transistor. When driving each pixel by flowing a current through the pixel driving thin film transistor, red light, green light, blue light, cyan color light, magenta light or yellow color light may be realized.

Therefore, as shown in FIG. 6, the color gamut formed by connecting the points of red (R), green (G), blue (B), cyan (C), magenta (M), and yellow (Y) may be formed. All colors can be reproduced.

 According to the present invention as described above, yellow pixels, cyan pixels, and magenta pixels are arranged between red pixels, green pixels, and blue pixels, respectively, to reproduce colors by reproducing cyan light, magenta light, and yellow light in addition to red light, green light, and blue light. It is possible to display an image close to the real object by increasing the reproduction range, to facilitate the process, and to increase the number of unit pixels for reproducing color, thereby advantageously increasing the area of the flat panel display device.

Claims (15)

An organic light emitting display device having a first electrode and a second electrode and including an organic light emitting layer therebetween; Two or more thin film transistors for controlling the organic light emitting display device; A plurality of scan signal lines for supplying scan signals to the thin film transistors; A plurality of data signal lines for supplying data to the thin film transistors; A pixel region defined by each of the scan signal lines and the data signal lines, the pixel region including the organic light emitting element; And the pixel area is provided in the order of red pixels, yellow pixels, green pixels, cyan pixels, blue pixels, and magenta pixels. The method of claim 1, The yellow pixel includes a red light emitting layer and a green light emitting layer at the same time. The method of claim 2, The yellow pixel is provided in the order of the red light emitting layer and the green light emitting layer. The method of claim 1, The cyanide pixel includes a green light emitting layer and a blue light emitting layer at the same time. The method of claim 4, wherein The cyanide pixel is provided in the order of the green light emitting layer and the blue light emitting layer. The method of claim 1, The magenta pixel includes a blue light emitting layer and a red light emitting layer at the same time. The method of claim 6, The magenta pixel is provided in the order of the blue light emitting layer and the red light emitting layer. An organic light emitting display device having a first electrode and a second electrode and including an organic light emitting layer therebetween; Two or more thin film transistors for controlling the organic light emitting display device; A plurality of scan signal lines for supplying scan signals to the thin film transistors; A plurality of data signal lines for supplying data to the thin film transistors; A pixel region defined by each of the scan signal lines and the data signal lines, the pixel region including the organic light emitting element; In the pixel area is a manufacturing method of an organic light emitting display device arranged in the order of red pixels, yellow pixels, green pixels, cyan pixels, blue pixels and magenta pixels, The light emitting layer of each pixel and the light emitting layer of the same color constituting the adjacent pixels are formed at the same time. The method of claim 8, The yellow pixel is a manufacturing method of an organic light emitting display device, characterized in that consisting of a red light emitting layer and a green light emitting layer. The method of claim 8, The cyanide pixel is a method of manufacturing an organic light emitting display device, characterized in that consisting of a green light emitting layer and a blue light emitting layer. The method of claim 8, The magenta pixel comprises a blue light emitting layer and a red light emitting layer. The method according to any one of claims 8 to 11, The green light emitting layer constituting the yellow pixel, green pixel and cyan pixel is formed simultaneously. The method according to any one of claims 8 to 11, The blue light emitting layer constituting the cyan pixel, blue pixel and magenta pixel is formed at the same time. The method according to any one of claims 8 to 11, And a red light emitting layer constituting the magenta pixel, the red pixel, and the yellow pixel is formed at the same time. The method of claim 8, The light emitting layer is a method of manufacturing an organic light emitting display device, characterized in that formed by vacuum deposition using a fine metal mask (Laser Induced Thermal Imaging).

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