KR102434387B1 - Organic light emitting display device including organic light emitting diode and method for manufacturing the same - Google Patents

Abstract

The present embodiments disclose an organic light emitting diode display including an organic light emitting diode and a method of manufacturing the same. In the organic light emitting display device according to the disclosed embodiments, the first electrode or the second electrode of the organic light emitting device includes a wavelength conversion region in a region corresponding to the emission region of at least one sub-pixel, thereby reducing the thickness of the display device. and to simplify the process.

Description

Organic light emitting display device including organic light emitting element and manufacturing method thereof

The present invention relates to an organic light emitting diode display including an organic light emitting device and a method for manufacturing the same, and more particularly, to an organic light emitting display device including an organic light emitting device capable of reducing the thickness of the display device and simplifying a process thereof It relates to a manufacturing method.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Recently, a liquid crystal display device (LCD), a plasma display panel device (PDP), Various flat panel display devices such as an organic light emitting diode display device (OLED) are being used.

Among such display devices, since the organic light emitting display device uses a self-luminous device, a backlight used in a liquid crystal display device using a non-light emitting device is not required, so that it can be lightweight and thin. In addition, the organic light emitting display device has better viewing angle and contrast ratio than the liquid crystal display device, and is advantageous in terms of power consumption. In addition, the organic light emitting display device can be driven with a low DC voltage, has a fast response speed, is strong against external shocks because the internal components are solid, has a wide operating temperature range, and has advantages of low cost in terms of manufacturing cost.

Such an organic light emitting display device displays an image in the form of a top emission method or a bottom emission method according to a structure of an organic light emitting device including a first electrode, a second electrode, and an organic light emitting layer. The bottom emission method displays visible light generated from the organic light emitting layer toward the lower side of the substrate on which the TFT is formed, whereas the top emission method displays visible light generated from the organic light emitting layer toward the upper side of the substrate on which the TFT is formed.

Such an organic light emitting display device includes a plurality of color filters for color gamut. Accordingly, a process of forming a color filter is added. In addition, in the case of a top emission type organic light emitting display device, a color filter is provided on one surface of the upper substrate, and a bonding process of the upper substrate and the lower substrate is further added. In addition, since the organic light emitting display device includes a color filter, there is a problem in that the thickness of the display device is increased.

In addition, in the case of a large-area organic light emitting display device, a large-area mask is used to form a color filter. In this case, it is difficult to form a desired pattern due to the mask sagging due to the weight of the mask. Accordingly, there is a demand for an organic light emitting display device capable of solving such a problem.

An object of the present invention is to provide an organic light emitting diode display including an organic light emitting device capable of simplifying a process and reducing the thickness of a display panel, and a method for manufacturing the same.

An organic light emitting display device including an organic light emitting device of the present invention for solving the problems of the prior art and a method for manufacturing the same include a first electrode, an organic light emitting layer on the first electrode, and nanoparticles on the organic light emitting layer and a second electrode. Here, the nanoparticles may be any one or more of aluminum, molybdenum, gold, silver, copper, or an alloy thereof.

A substrate divided into a plurality of sub-pixels, which is disposed for each sub-pixel on the substrate, and includes a first electrode, an organic light emitting layer, and a second electrode, wherein the first electrode or the second electrode comprises a light emitting area of at least one sub pixel; A wavelength conversion region is provided in the corresponding region.

Here, the wavelength conversion region includes a plurality of nanoparticles. The nanoparticles may be any one or more of aluminum, molybdenum, gold, silver, copper, or an alloy thereof.

The plurality of nanoparticles may be doped into the first electrode or the second electrode.

The wavelength conversion region may convert the first light emitted from the organic light emitting diode into a wavelength different from that of the first light.

In addition, at least one sub-pixel among the plurality of sub-pixels may include an unarranged wavelength conversion region.

In the organic light emitting display device including the organic light emitting diode according to the present embodiments and the method for manufacturing the same, at least one light emitting region includes a first electrode or a second electrode of the organic light emitting device including a wavelength conversion region, so that There is an effect that can reduce the thickness of the generated panel.

In addition, the organic light emitting display device including the organic light emitting diode and the manufacturing method thereof according to the present embodiments can eliminate the process of forming a color filter, and thus the bonding process of the upper substrate and the lower substrate can also be simplified. have.

In addition, since the organic light emitting display device including the organic light emitting diode and the method for manufacturing the same according to the present embodiments includes a wavelength conversion region, the mask drooping phenomenon due to the weight of the mask is prevented even when manufacturing the large area display device. This can prevent problems with aligning the mask.

1 is a schematic system configuration diagram of an organic light emitting diode display according to example embodiments.
2 is a diagram illustrating a schematic structure of an organic light emitting diode display according to the first exemplary embodiment.
3 is a cross-sectional view of the organic light emitting display device according to the first exemplary embodiment.
4 is a view showing that the wavelength of light is converted through the wavelength conversion region.
5 is a diagram illustrating light absorption and scattering by nanoparticles.
FIG. 6 is a view showing that the surface plasmon resonance phenomenon occurs by nanoparticles.
7 is a diagram illustrating a schematic structure of an organic light emitting diode display according to a second exemplary embodiment.
8 is a cross-sectional view of an organic light emitting diode display according to a second exemplary embodiment.
9 is a diagram illustrating a schematic structure of an organic light emitting diode display according to a third exemplary embodiment.
10 is a cross-sectional view of an organic light emitting diode display according to a third exemplary embodiment.
11 is a diagram illustrating a schematic structure of an organic light emitting display device according to a fourth exemplary embodiment.
12 is a cross-sectional view of an organic light emitting display device according to a fourth exemplary embodiment.
13 to 16 are views illustrating a process of forming a wavelength conversion region applied to the present embodiments.

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

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

Reference to an element or layer to another element or “on” or “on” includes not only directly on the other element or layer, but also with other layers or other elements interposed therebetween. do. On the other hand, reference to an element "directly on" or "directly on" indicates that there are no intervening elements or layers.

The spatially relative terms "below, beneath", "lower", "above", "upper", etc. are one element or component as shown in the drawings. and can be used to easily describe the correlation with other devices or components. Spatially relative terms should be understood as terms including different directions of the device during use or operation in addition to the directions shown in the drawings. For example, when an element shown in the figures is turned over, an element described as "beneath" or "beneath" another element may be placed "above" the other element. Accordingly, the exemplary term “below” may include both directions below and above.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms.

1 is a schematic system configuration diagram of an organic light emitting diode display according to example embodiments. Referring to FIG. 1 , in the organic light emitting diode display 1000 according to the present exemplary embodiments, a plurality of data lines DL to DLm and a plurality of gate lines GL1 to GLn are disposed, and a plurality of sub pixels are disposed. ), the data driver 1200 driving the plurality of data lines DL to DLm, the gate driver 1300 driving the plurality of gate lines GL1 to GLn, and the data driver 1200 and a timing controller 1400 for controlling the gate driver 1300 , and the like.

The data driver 1200 drives a plurality of data lines by supplying data voltages to the plurality of data lines. In addition, the gate driver 1300 sequentially drives the plurality of gate lines by sequentially supplying scan signals to the plurality of gate lines.

Also, the timing controller 1400 controls the data driver 1200 and the gate driver 1300 by supplying control signals to the data driver 1200 and the gate driver 1300 . The timing controller 1400 starts scanning according to the timing implemented in each frame, converts the input image data input from the outside to match the data signal format used by the data driver 1200, and outputs the converted image data. , control the data drive at an appropriate time according to the scan.

The gate driver 1300 sequentially drives the plurality of gate lines by sequentially supplying a scan signal of an on voltage or an off voltage to the plurality of gate lines under the control of the timing controller 1400 . . In addition, the gate driver 1300 may be located only on one side of the organic light emitting display panel 1100 as shown in FIG. 1 , depending on a driving method or an organic light emitting display panel design method, etc., and in some cases, located on both sides. You may.

Also, the gate driver 1300 may include one or more gate driver integrated circuits. Each gate driver integrated circuit is connected to a bonding pad of the organic light emitting display panel 1100 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) method. ) type and may be disposed directly on the organic light emitting display panel 1100, or may be integrated and disposed on the organic light emitting display panel 1100 in some cases.

In addition, each gate driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, the gate driving chip corresponding to each gate driver integrated circuit may be mounted on a flexible film, and one end of the flexible film may be bonded to the organic light emitting display panel 1100 .

When a specific gate line is opened, the data driver 1200 converts the image data received from the timing controller 1400 into analog data voltage and supplies it to the plurality of data lines, thereby driving the plurality of data lines. In addition, the data driver 1200 may drive a plurality of data lines including at least one source driver integrated circuit.

Each source driver integrated circuit is connected to a bonding pad of the organic light emitting display panel 1100 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or the organic light emitting display panel ( It may be directly disposed on the 1100 , or in some cases, may be integrated and disposed on the organic light emitting display panel 1100 .

In addition, each source driver integrated circuit may be implemented in a chip on film (COF) method. In this case, the source driving chip corresponding to each source driver integrated circuit is mounted on a flexible film, one end of the flexible film is bonded to at least one source printed circuit board, and the other end is an organic light emitting display. It is bonded to the panel 1100 .

The source printed circuit board is connected to the control printed circuit board through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). A timing controller 1400 is disposed on the control printed circuit board.

In addition, a power controller (not shown) that supplies voltage or current to the organic light emitting display panel 1100 , the data driver 1200 , and the gate driver 1300 or controls the voltage or current to be supplied is further disposed on the control printed circuit board can be The above-mentioned source printed circuit board and control printed circuit board may be a single printed circuit board.

Meanwhile, a pixel of the present invention includes one or more subpixels. For example, the pixel of the present invention may include 2 to 4 sub-pixels. The colors defined in the sub-pixel may include red (R), green (G), blue (B), and optionally white (W), but the present invention is not limited thereto.

In addition, the organic light emitting device of the present invention may include a first electrode, an organic light emitting layer, and a second electrode, and the organic light emitting layer may include all of the configurations disposed in each sub-pixel or disposed on the entire surface of the lower substrate.

In this case, the electrode connected to the thin film transistor for controlling the light emission of each sub-pixel of the display panel is referred to as a first electrode, and the electrode disposed on the entire surface of the display panel or including two or more pixels is referred to as a second electrode. When the first electrode is an anode electrode, the second electrode is a cathode electrode, and vice versa. Hereinafter, an anode electrode as an embodiment of the first electrode and a cathode electrode as an embodiment of the second electrode will be mainly described, but the present invention is not limited thereto.

Next, the organic light emitting display device according to the first embodiment will be reviewed with reference to FIGS. 2 to 5 . 2 is a diagram illustrating a schematic structure of an organic light emitting diode display according to the first exemplary embodiment.

Referring to FIG. 2 , the organic light emitting display device according to the first embodiment includes a first substrate 100 , an organic light emitting device EL, an encapsulation layer 160 , a resin layer 170 , and a second substrate 180 . include Here, the first substrate 100 is divided into a plurality of sub-pixels, and each sub-pixel includes light-emitting areas EA1 , EA2 , and EA3 . In addition, the organic light emitting device EL may include a first electrode 120 , an organic light emitting layer 140 , and a second electrode 150 .

Meanwhile, the organic light emitting display device according to the first embodiment discloses a configuration in which one pixel includes three sub-pixels. Specifically, one pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel.

In addition, the first sub-pixel includes the first emission area EA1 , the second sub-pixel includes the second emission area EA2 , and the third sub-pixel includes the third emission area EA3 . Meanwhile, the first light emitting area EA1 , the second light emitting area EA2 , and the third light emitting area EA3 may emit light in at least one of red (R), green (G), and blue (B) colors. .

In detail, the first electrode 120 is disposed on the first substrate 100 , the organic light-emitting layer 140 is disposed on the first electrode 120 , and the second electrode 150 is disposed on the organic light-emitting layer 140 . ) is placed. Then, the encapsulation layer 160 is disposed on the second electrode 150 , the resin layer 170 is disposed on the encapsulation layer 160 , and the second substrate 180 is disposed on the resin layer 170 . do.

In this case, the first electrode 120 of the organic light emitting device EL may include a reflective layer. In addition, the second electrode 150 may be made of a transparent conductive material. Accordingly, the light emitted from the organic light emitting layer 140 directly passes through the second electrode 150 or is reflected by the second electrode 120 and passes through the second electrode 150 , thereby generating top-emission. can do.

Here, the organic light emitting layer 140 of the organic light emitting device EL may emit first light in the first to third light emitting regions EA1 , EA2 , and EA3 . In this case, the first light may be white (W) light.

On the other hand, the second electrode 150 of the organic light emitting device EL disposed in the first to third light emitting areas EA1, EA2, EA3 forms the wavelength conversion areas 151, 152 and 153 in at least one light emitting area. can be provided Here, the wavelength conversion region may convert the first light emitted from the organic light emitting device EL into any one of the second light, the third light, and the fourth light.

A detailed review of this configuration with reference to FIG. 3 is as follows. 3 is a cross-sectional view of the organic light emitting display device according to the first exemplary embodiment.

Referring to FIG. 3 , the organic light emitting diode display according to the first embodiment includes first to third sub-pixels SP1 , SP2 , and SP3 . A thin film transistor 110 is disposed on the first substrate 100 for each of the sub-pixels SP1 , SP2 , and SP3 , and a protective layer 111 is disposed on the thin film transistor.

In addition, the first electrode 120 of the organic light emitting device EL electrically connected to the drain electrode (not shown) of the thin film transistor 110 through the contact hole formed in the protective layer 111 is disposed. In this case, the first electrode 120 may be a reflective electrode.

However, although FIG. 3 discloses a configuration in which the first electrode 120 is formed of a single layer, the first electrode 120 according to the first embodiment is not limited thereto, and is configured to include a reflective layer and a transparent conductive layer. It may be multi-layered. For example, the first electrode 120 may be formed of two to four layers.

A bank pattern 130 defining a light emitting region and a non-emission region is disposed on a portion of the upper surface of the first electrode 120 of the organic light emitting diode EL and the upper surface of the protective layer 111 . The organic light emitting layer 140 is disposed on the bank pattern 130 and the upper surface of the first electrode 120 .

In this case, the organic light emitting layer 140 may be the organic light emitting layer 140 emitting the first light. Here, the first light may be white (W) light. In addition, the second electrode 150 is disposed on the organic light emitting layer 140 .

On the other hand, the organic light emitting layer 140 according to the first embodiment is disposed on the bank pattern 130 and the upper surface of the first electrode 120, and discloses a configuration for emitting white (W) light, but in the first embodiment Other organic light emitting display devices are not limited thereto. For example, the organic light emitting layer 140 of the organic light emitting diode display according to the first embodiment may be disposed only on the upper surface of the first electrode 120 .

In addition, the organic light emitting layer 140 disposed in each of the sub-pixels SP1 , SP2 , and SP3 may emit any one of red (R), green (G), and blue (B) colors. However, in the following description, the configuration in which the organic light emitting layer 140 is disposed on the bank pattern 130 and the first electrode 120 and the organic light emitting layer 140 emits the first light will be mainly described.

Meanwhile, the first to third sub-pixels SP1 , SP2 , and SP3 include a first emission area EA1 , a second emission area EA2 , and a third emission area EA3 , respectively. In addition, the second electrode 150 may include a wavelength conversion region in a region corresponding to the emission region of at least one sub-pixel.

2 and 3, the second electrode 150 is a first wavelength conversion region 151 at positions corresponding to the first emission region EA1, the second emission region EA2, and the third emission region EA3, respectively. , discloses a configuration having a second wavelength conversion region 152 and a third wavelength conversion region 153 .

However, the organic light emitting display device according to the first exemplary embodiment is not limited thereto, and the second electrode 150 includes at least one of the first light emitting area EA1 , the second light emitting area EA2 , and the third light emitting area EA3 . It may include a configuration having a wavelength conversion region to correspond to one light emitting region.

The above-described wavelength conversion regions 151 , 152 , and 153 may convert light emitted from the organic light emitting layer 140 into light having a different wavelength. The configuration of the wavelength conversion regions 151, 152, and 153 will be described with reference to FIGS. 4 to 6 as follows.

4 is a view showing that the wavelength of light is converted through the wavelength conversion region. 5 is a diagram illustrating light absorption and scattering by nanoparticles. FIG. 6 is a view showing that the surface plasmon resonance phenomenon occurs by nanoparticles.

Meanwhile, FIG. 4 will be mainly described with respect to the organic light emitting diode disposed in the area corresponding to the first light emitting area EA1 of the organic light emitting display device according to the first exemplary embodiment. In FIG. 4 , the first wavelength conversion region 151 may include a plurality of nanoparticles 151a. Here, the plurality of nanoparticles 151a may be doped on the surface of the second electrode. That is, the first wavelength conversion region 151 may include the second electrode of the organic light emitting device and a plurality of nanoparticles 151a.

Also, the nanoparticles 151a may be made of a metal material. For example, the nanoparticles 151a may be made of at least one of aluminum (Al), molybdenum (Mo), gold (Au), silver (Ag), copper (Gu), or an alloy thereof.

At this time, the nanoparticles 151a made of a metal material cause a surface plasmon resonance phenomenon in the first light emitting region EA1 to simultaneously increase scattering and absorption of light, thereby emitting light from the organic light emitting layer 140 . The light extraction effect may be improved while converting the first light into the second light having a wavelength different from that of the first light.

On the other hand, plasmon is a phenomenon in which electrons in a material vibrate at the same time, meaning waves of electrons. When a metal containing a large number of free electrons becomes nano-sized, the surface plasmon resonance characteristic appears due to the behavior of free electrons, thereby having unique optical properties.

Here, surface plasmon resonance refers to a phenomenon in which free electrons on the metal surface collectively vibrate due to resonance with an electromagnetic field of a specific energy possessed by light when light is incident between the surface of a metal nanoparticle and a dielectric such as water or air. .

That is, surface plasmon resonance is a collective charge density oscillation of free electrons occurring on the surface of a metal. to be.

In FIG. 5 , the nanoparticles 151a absorb the light 300 passing through the first wavelength conversion region 151 of the second electrode. In addition, the light 300 absorbed by the nanoparticles 151a may reach the surface of the nanoparticles 151a and be scattered in all directions to become the scattered light 310 .

In other words, the nanoparticles 151a strongly absorb light by strongly resonating with the light in the visible wavelength region, and scatter the absorbed light so that more photons can be emitted. In this case, the wavelength of the light absorbed by the nanoparticles 151a may be adjusted differently depending on the size or the amount of the nanoparticles 151a. Accordingly, the nanoparticles 151a may efficiently induce a surface plasmon resonance phenomenon.

This will be reviewed in more detail with reference to FIG. 6 as follows. In FIG. 6 , free electrons of the nanoparticles 151a are collectively vibrated by the light 320 incident between the surfaces of the nanoparticles 151a. At this time, a local charge imbalance of the free electrons of the nanoparticles 151a occurs and vibrates at a resonance frequency. Here, the wavelength band resonating with the same frequency as the first light emitted from the organic light emitting layer 140 is extinguished, ie, absorbed, and the light of the remaining wavelength band is emitted. Here, the light that is extinguished due to the surface plasmon resonance phenomenon is expressed as 'absorbed', and the emitted light is expressed as 'scattered'.

Meanwhile, in FIG. 4 , the nanoparticles 151a of the first wavelength conversion region 151 disposed in the first emission region EA1 have a wavelength of 620 nm to 640 nm among the first light emitted from the organic emission layer 140 . Absorbs all wavelengths of light except for In addition, the nanoparticles 151a scatter light having a wavelength of 620 nm to 640 nm, that is, the second light to be extracted to the outside. Accordingly, the first wavelength conversion region 151 converts the first light emitted from the organic light emitting layer 140 into the second light and extracts it to the outside.

As described above, in FIG. 3 , the nanoparticles of the second wavelength conversion region 152 disposed in the second emission region EA2 exclude light having a wavelength of 520 nm to 560 nm among the first light emitted from the organic emission layer 140 . All other wavelengths of light are absorbed. And, the nanoparticles are extracted to the outside by scattering the light having a wavelength of 520 nm to 560 nm, that is, the third light. Accordingly, the second wavelength conversion region 152 converts the first light emitted from the organic light emitting layer 140 into a third light and extracts it to the outside.

In addition, the nanoparticles of the third wavelength conversion region 153 disposed in the third light emitting area EA3 have wavelengths other than light of a wavelength of 420 nm to 460 nm among the first light emitted from the organic light emitting layer 140 . absorb all And, the nanoparticles are extracted to the outside by scattering the light having a wavelength of 420 nm to 460 nm, that is, the fourth light. Accordingly, the third wavelength conversion region 153 converts the first light emitted from the organic light emitting layer 140 into the fourth light and extracts it to the outside.

Meanwhile, the first wavelength conversion region 151 , the second wavelength conversion region 152 , and the third wavelength included in each of the first emission region EA1 , the second emission region EA2 , and the third emission region EA3 . Each of the transformation regions 153 includes different nanoparticles. Through this, it is possible to emit light of different wavelengths in different light emitting regions. Here, the difference means that at least one or more of the shape, size, and type of the nanoparticles, the amount of nanoparticles included in the wavelength conversion region, or the implantation depth of the nanoparticles is different. The above factors are factors that can control the degree of absorbing or scattering light through the nanoparticles.

For example, the amount of nanoparticles included in the first wavelength conversion region 151 , the second wavelength conversion region 152 , and the third wavelength conversion region 153 may be different from each other. Through this, the wavelength band of the light absorbed by the nanoparticles can be adjusted.

Specifically, the amount of nanoparticles included in the first wavelength conversion region 151 may be less than the amount of nanoparticles included in the second wavelength conversion region 152 . In addition, the amount of nanoparticles included in the second wavelength conversion region 152 may be less than the amount of nanoparticles included in the third wavelength conversion region 153 . That is, as the amount of nanoparticles is smaller, light of a lower wavelength may be absorbed and light of a higher wavelength may be scattered, so that light having a higher wavelength to the outside of the display device may be emitted to the outside of the second substrate 180 .

On the other hand, as the amount of nanoparticles increases, the size of the nanoparticles may increase and the shape may change. Accordingly, the size and shape of nanoparticles included in the first wavelength conversion region 151 , the second wavelength conversion region 152 , and the third wavelength conversion region 153 may be different from each other. Here, as the amount of nanoparticles increases, the nanoparticles have an irregular or prismatic shape rather than a spherical particle. That is, the wavelength band of the light absorbed by the nanoparticles can be adjusted by using these optical properties.

Specifically, the size of the nanoparticles included in the first wavelength conversion region 151 may be smaller than the size of the nanoparticles included in the second wavelength conversion region 152 . In addition, the size of the nanoparticles included in the second wavelength conversion region 152 may be smaller than the size of the nanoparticles included in the third wavelength conversion region 152 . That is, as the size of the nanoparticles is smaller, light of a lower wavelength band may be absorbed, and light of a higher wavelength may be scattered to allow light of a higher wavelength to be emitted outside the second substrate 180 to the outside of the display device.

An encapsulation layer 160 , a resin layer 170 , and a second substrate 180 may be sequentially disposed on the second electrode 150 of the organic light emitting device EL as described above.

As described above, in the top emission type organic light emitting display device, since the second electrode 150 of the organic light emitting element EL has a wavelength conversion region in a region corresponding to the emission region, light of a desired wavelength is emitted without a separate color filter. The light can be emitted to the outside of the display device. That is, since there is no separate color filter, the color filter process can be eliminated and the thickness of the display device can be reduced.

Next, the organic light emitting display device according to the second embodiment will be reviewed with reference to FIGS. 7 and 8 . The organic light emitting diode display according to the second exemplary embodiment may include the same components as those of the above-described exemplary embodiment. A description that overlaps with the above-described embodiment may be omitted. Also, the same components have the same reference numerals.

7 is a diagram illustrating a schematic structure of an organic light emitting diode display according to a second exemplary embodiment. Referring to FIG. 7 , in the organic light emitting display device according to the second embodiment, the first electrode 220 of the organic light emitting element EL is made of a transparent conductive material and the second electrode 250 is made of a reflective electrode. There is a difference.

At this time, a portion of the light emitted from the organic light emitting layer 140 is emitted to the outside of the first substrate 100 through the first electrode 220 , and a portion of the remaining light is reflected by the second electrode 250 to the first electrode As light exits to the outside of the first substrate 100 through 220 , bottom emission may be performed.

Here, the organic light emitting layer 140 of the organic light emitting device EL may emit first light in the first to third light emitting regions EA1 , EA2 , and EA3 . In this case, the first light may be white (W) light.

On the other hand, the first electrode 220 of the organic light emitting device EL disposed in the first to third light emitting areas EA1, EA2, EA3 forms wavelength conversion areas 221, 222, 223 in at least one light emitting area. can be provided Here, the wavelength conversion region may convert the first light emitted from the organic light emitting device EL into any one of the second light, the third light, and the fourth light.

A detailed review of this configuration with reference to FIG. 8 is as follows. 8 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment.

Referring to FIG. 8 , in the organic light emitting display device according to the second exemplary embodiment, the first electrode 220 of the organic light emitting element EL includes a first light emitting area EA1 , a second light emitting area EA2 , and a third light emission. A first wavelength conversion area 221 , a second wavelength conversion area 222 , and a third wavelength conversion area 223 are provided in the area corresponding to the area EA3 , respectively.

The first wavelength conversion region 221 , the second wavelength conversion region 222 , and the third wavelength conversion region 223 each include a plurality of nanoparticles. In addition, the nanoparticles included in each wavelength conversion region (221, 222, 223) may differ in shape, size, type, at least one or more of the amount of nanoparticles included in the wavelength conversion region or the injection depth of the nanoparticles. have.

Here, the first wavelength conversion area 221 disposed in the first light emitting area EA1 converts the first light emitted from the organic light emitting layer 140 into second light that is light having a wavelength of 620 nm to 640 nm to form a first substrate. (100) Extracted to the outside.

In addition, the nanoparticles of the second wavelength conversion region 222 disposed in the second light emitting area EA2 convert the first light emitted from the organic light emitting layer 140 into the third light having a wavelength of 520 nm to 560 nm. The first substrate 100 is extracted to the outside.

In addition, the nanoparticles of the third wavelength conversion region 223 disposed in the third light emitting area EA3 convert the first light emitted from the organic light emitting layer 140 into fourth light having a wavelength of 420 nm to 460 nm. The first substrate 100 is extracted to the outside.

As described above, in the bottom emission type organic light emitting display device, since the first electrode 220 of the organic light emitting element EL includes a wavelength conversion region, light of a desired wavelength is emitted from each sub-pixel without a separate color filter. can be emitted.

Hereinafter, the organic light emitting display device according to the third exemplary embodiment will be reviewed with reference to FIGS. 9 and 10 . The organic light emitting diode display according to the third exemplary embodiment may include the same components as those of the above-described exemplary embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

9 is a diagram illustrating a schematic structure of an organic light emitting diode display according to a third exemplary embodiment. 10 is a cross-sectional view of an organic light emitting display device according to a third exemplary embodiment. 9 and 10 , a top emission type organic light emitting display device in which four sub-pixels constitute one pixel is disclosed.

In detail, one pixel includes four sub-pixels SP1, SP2, SP3, and SP4, and each of the four sub-pixels SP1, SP2, SP3, and SP4 includes one emission region. That is, one pixel includes a first emission area EA1 , a second emission area EA2 , a third emission area EA3 , and a fourth emission area EA4 .

On the other hand, the second electrode 350 of the organic light emitting diode display according to the third exemplary embodiment is formed in regions corresponding to the first light emitting area EA1 , the second light emitting area EA2 , and the third light emitting area EA3 , respectively. It includes a first wavelength conversion region 351 , a second wavelength conversion region 352 , and a third wavelength conversion region 353 .

That is, the second electrode 350 may not include a wavelength conversion region in a region corresponding to the fourth emission region EA4 . In other words, the second electrode 350 may include the wavelength conversion region unassigned section 354 in the region corresponding to the fourth light emitting region EA4 .

Accordingly, the second light may be emitted from the first emission area EA1 , the third light may be emitted from the second emission area EA2 , and the fourth light may be emitted from the third emission area EA3 . In addition, in the fourth light emitting area EA4 , the first light emitted from the organic light emitting layer 240 may be emitted to the outside of the second substrate 200 as it is.

In addition, the organic light emitting diode display according to the present exemplary embodiments is not limited thereto, and may be formed as shown in FIGS. 11 and 12 . 11 is a diagram illustrating a schematic structure of an organic light emitting diode display according to a fourth exemplary embodiment. 12 is a cross-sectional view of an organic light emitting display device according to a fourth exemplary embodiment.

The organic light emitting diode display according to the fourth exemplary embodiment may include the same components as those of the above-described exemplary embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

11 and 12 , a bottom emission type organic light emitting display device in which four sub-pixels constitute one pixel is disclosed. On the other hand, the first electrode 420 of the organic light emitting diode display according to the fourth exemplary embodiment is formed in regions corresponding to the first light emitting area EA1, the second light emitting area EA2, and the third light emitting area EA3, respectively. It includes a first wavelength conversion region 421 , a second wavelength conversion region 422 , and a third wavelength conversion region 423 .

That is, the first electrode 420 may not include a wavelength conversion region in a region corresponding to the fourth emission region EA4 . In other words, the first electrode 420 may include the wavelength conversion region unassigned section 424 in the region corresponding to the fourth light emitting region EA4 . Accordingly, in the fourth light emitting area EA4 , light emitted from the organic light emitting device EL may be emitted to the outside of the display device as it is.

As described above, the organic light emitting diode display according to the present exemplary embodiments includes a wavelength conversion region in a region corresponding to the emission region of at least one sub-pixel even in a structure in which four sub-pixels constitute one pixel, so that each sub-pixel It is possible to emit a desired color even if the color filter is not provided.

A process for forming a wavelength conversion region applied to the present embodiments will be reviewed with reference to FIGS. 13 to 16 as follows. 13 to 16 are views illustrating a process of forming a wavelength conversion region applied to the present embodiments. 13 to 16 disclose a manufacturing method using a wavelength conversion region applied to an organic light emitting display device according to the third embodiment as an example.

13 to 16 , a light emitting region of one sub-pixel is disclosed, and a configuration in which the second electrode 350 is disposed on the organic light emitting layer 140 of the organic light emitting device is disclosed. Here, the second electrode 350 may be made of a transparent conductive material. For example, any one selected from indium-tin-oxide (ITO), indium-zinc-oxide (IZO), and indium-tin-zinc-oxide (ITZO) However, the material of the second electrode 350 is not limited thereto.

In addition, the first mask 500 is disposed to face the second electrode 350 . Here, the first mask 500 may include a first opening 501 . Thereafter, the first nanoparticles 351a are doped in the direction of the second electrode 350 .

In this case, the first nanoparticles 351a may be doped into a partial region of the second electrode 350 through the first opening 501 . The region of the second electrode 350 doped with the first nanoparticles 351a through the first opening 501 may be a first wavelength conversion region 351 .

Then, the second nanoparticles 352a different from the first nanoparticles 351a are doped through the second mask 510 having the second opening 502 . The region of the second electrode 350 doped with the second nanoparticles 352a through the second opening 502 may be the second wavelength conversion region 352 .

Thereafter, third nanoparticles 353a different from the first and second nanoparticles 351a and 352a are doped through a third mask 520 having a third opening 503 . The region of the second electrode 350 doped with the third nanoparticles 353a through the third opening 503 may be the third wavelength conversion region 353 .

Here, the implantation dose of the first to third nanoparticles 351a, 352a, and 353a may be in the range of 1.0E-16 to 3.0E-18 ions/cm 2 . In this case, the amounts of nanoparticles 351a, 352a, and 353a doped into the first to third wavelength conversion regions 351 , 352 , and 353 may be different within the aforementioned implantation amount range. Through this, light having a different wavelength may be emitted for each light emitting region.

As described above, by forming the first to third wavelength conversion regions 351 , 352 , and 353 , there is no need to use a mask used in a large-area organic light emitting display device, so a desired pattern can be formed due to the mask sagging due to the weight of the mask. It is possible to avoid problems with the formation.

As described above, in the organic light emitting display device according to the present exemplary embodiments, since at least one light emitting region includes the first electrode or the second electrode of the organic light emitting device including the wavelength conversion region, the color filter configuration may be omitted. Accordingly, it is possible to solve the problem of increasing the thickness of the panel caused by the color filter.

In addition, in the organic light emitting display device according to the present exemplary embodiments, the process of forming the color filter may be omitted, and thus the bonding process may also be simplified. That is, since it is not necessary to align the color filter arrangement area and each sub-pixel, the bonding process may be simplified.

In addition, since the organic light emitting display device according to the present exemplary embodiments has a wavelength conversion region, there is no need to use a mask used for a large area organic light emitting display device during the manufacturing process, thereby causing problems such as sagging of the mask due to the weight of the mask. Thus, it is possible to prevent problems in forming a desired pattern.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments may be implemented by modification.

120: first electrode
130: bank pattern
140: organic light emitting layer
150: second electrode
151: first wavelength conversion region
152: second wavelength conversion region
153: third wavelength conversion region

Claims (14)

delete delete a substrate divided into a plurality of sub-pixels; and
an organic light-emitting device disposed for each sub-pixel on the substrate and including a first electrode, an organic light-emitting layer, and a second electrode;
The plurality of sub-pixels include a light-emitting area and a non-emission area defined by a bank pattern including an upper surface and an inclined surface,
The first electrode or the second electrode includes a wavelength conversion region in a region corresponding to the emission region of at least one sub-pixel,
The wavelength conversion region is divided for each sub-pixel by a region corresponding to the upper surface of the bank pattern, and the wavelength conversion region divided for each sub-pixel includes first to third wavelength conversion regions,
In the first to third wavelength conversion regions, a plurality of metal nanoparticles different from each other in regions corresponding to the emission region are included in the first electrode or the second electrode,
Metal nanoparticles are not included in the first electrode and the second electrode in the region corresponding to the upper surface of the bank pattern,
The organic light emitting layer emits a first light,
The first wavelength conversion region converts the first light into light having a wavelength of 620 nm to 640 nm,
The second wavelength conversion region converts the first light into light having a wavelength of 520 nm to 560 nm,
The third wavelength conversion region converts the first light into light having a wavelength of 420 nm to 460 nm.
delete 4. The method of claim 3,
The nanoparticles are aluminum, molybdenum, gold, silver, copper, or an organic light emitting display device of any one or more of an alloy thereof.
4. The method of claim 3,
Nanoparticles included in different wavelength conversion regions have different shapes, sizes, and types of nanoparticles, at least one or more of the amount of nanoparticles included in the wavelength conversion region, or the injection depth of nanoparticles.
7. The method of claim 6,
An organic light emitting display device that absorbs light of a lower wavelength and scatters light of a higher wavelength as the size of the nanoparticles decreases.
7. The method of claim 6,
An organic light emitting display device that absorbs light of an unfamiliar wavelength and scatters light of a higher wavelength as the amount of the nanoparticles decreases.
7. The method of claim 6,
An organic light emitting display device that absorbs low-wavelength light and scatters high-wavelength light as the shape of the nanoparticles is closer to a spherical shape.
delete 4. The method of claim 3,
The first electrode includes a reflective layer, and the second electrode includes a transparent conductive material.
4. The method of claim 3,
and at least one sub-pixel among the plurality of sub-pixels includes a wavelength conversion region unarranged region.
forming a first electrode for each sub-pixel on the substrate;
forming an organic light emitting layer on the first electrode; and
forming a second electrode on the organic light emitting layer; including,
Each of the sub-pixels includes a light-emitting area and a non-emission area defined by a bank pattern including an upper surface and an inclined surface,
The first electrode or the second electrode includes a wavelength conversion region in a region corresponding to the emission region of at least one sub-pixel,
The wavelength conversion region is divided for each sub-pixel by a region corresponding to the upper surface of the bank pattern, and the wavelength conversion region divided for each sub-pixel includes first to third wavelength conversion regions,
In the first to third wavelength conversion regions, a plurality of metal nanoparticles different from each other in regions corresponding to the emission region are included in the first electrode or the second electrode,
Metal nanoparticles are not included in the first electrode and the second electrode in the region corresponding to the upper surface of the bank pattern,
The organic light emitting layer emits a first light,
The first wavelength conversion region converts the first light into light having a wavelength of 620 nm to 640 nm,
The second wavelength conversion region converts the first light into light having a wavelength of 520 nm to 560 nm,
The third wavelength conversion region converts the first light into light having a wavelength of 420 nm to 460 nm.
14. The method of claim 13,
The step of forming a wavelength conversion region on the first electrode or the second electrode,
disposing a mask having an opening to face the first electrode or the second electrode; and
and doping the nanoparticles through the mask.

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