KR102009881B1 - Organic light emitting diode display device - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes a substrate including an active region in which an image is displayed, and a light emitting layer disposed on the active region of the substrate and interposed between the first electrode and the second electrode. A plurality of subpixels, each of the plurality of subpixels being arranged in n columns and m rows (n, m is one or more natural numbers), and each color filter corresponding to each of the subpixels is arranged, The red and green color filters are alternately arranged in the nth column, and the sky blue and deep blue color filters are alternately arranged in the n + 1th column, and the size of the subpixel in the n + 1th column is located in the nth column. It is characterized by being larger than the size of the sub-pixel.

Description

Organic light emitting display device and manufacturing method thereof {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting display device and a method of manufacturing the same.

Recently, the importance of flat panel displays (FPDs) has increased with the development of multimedia. In response to this, a variety of liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), organic light emitting devices (Organic Light Emitting Devices), etc. Flat panel displays have been put into practical use.

In particular, the organic light emitting display device has a high response time with a response speed of 1 ms or less, low power consumption, and self-luminous light. In addition, there is no problem in viewing angle, which is advantageous as a moving image display medium regardless of the size of the device. In addition, low-temperature manufacturing is possible, and the manufacturing process is simple based on the existing semiconductor process technology has attracted attention as the next generation flat panel display device.

1 is a cross-sectional view of a conventional organic light emitting display device, and FIG. 2 is a plan view of an organic light emitting display device. Referring to FIG. 1, first electrodes 10 are positioned on the thin film transistor array substrate 5, and a light emitting layer 11 and a second electrode 12 are positioned on the first electrode 10. For each pixel, a red color filter 13R, a green color filter 13G, a blue color filter 13B, and a white color filter 13W are positioned to form an organic light emitting display device. As shown in FIG. 2, in the organic light emitting display device, a red color filter 13R, a green color filter 13G, a blue color filter 13B, and a white color filter 13W are sequentially arranged, and red and green colors are arranged. Blue, white and white.

The above-described organic light emitting display device emits white light in the light emitting layer and implements full color through red, green, blue, and white color filters. However, since four subpixels are required, high resolution is difficult to apply in terms of resolution, and white light is emitted as it is without color filters in the white subpixels, resulting in a decrease in ambient contrast ratio (ACR). . Therefore, it is difficult to remove the polarizing plate of the display device, thereby increasing the manufacturing cost and increasing the process.

The present invention provides an organic light emitting display device and a method of manufacturing the same, which can reduce the manufacturing process and cost by increasing the structure of subpixels, increase light efficiency, and improve aperture ratio.

In order to achieve the above object, an organic light emitting display device according to an embodiment of the present invention, a substrate including an active region in which an image is displayed, and is positioned on the active region of the substrate, the first electrode and the second And a plurality of subpixels including a light emitting layer interposed between electrodes, wherein the plurality of subpixels are arranged in n columns and m rows (n and m are one or more natural numbers) and correspond to the respective subpixels. Each color filter is arranged, the red and green color filters are alternately arranged in the nth column, and the sky blue and deep blue color filters are alternately arranged in the n + 1th column, and the subpixels are located in the n + 1th column. Is greater than the size of the sub-pixel located in the n-th column.

The light emitting layer is characterized in that it comprises light emitting layers for emitting yellow and blue.

The light emitting layers are positioned on the entire surface of the active area.

The size of the color filter is characterized in that corresponding to the size of the one sub-pixel.

The size of at least one of the sky blue or the deep blue color filter is greater than or equal to the sum of the sizes of the red and green color filters.

The method may further include a first hole transport layer and a second hole transport layer positioned between the first electrode and the light emitting layer.

The first hole transport layer is positioned on the substrate in the form of a stripe.

The first hole transport layer is positioned only in the row where the red color filter is located.

The second hole transport layer is located on the first hole transport layer, characterized in that located on the entire surface of the active area.

In addition, the method of manufacturing an organic light emitting display device according to an embodiment of the present invention includes providing a substrate including an active region, and forming a light emitting layer interposed between a first electrode and a second electrode on the active region of the substrate. Forming a plurality of subpixels, and forming a color filter corresponding to each of the plurality of subpixels, wherein the plurality of subpixels are arranged in n columns and m rows (n, m is a natural number of 1 or more), and the red and green color filters are alternately arranged in the nth column, and the sky blue and deep blue color filters are alternately arranged in the n + 1th column, and the subpixels of the n + 1th column The size is larger than the size of the subpixel located in the nth column.

The light emitting layer is characterized in that it comprises light emitting layers for emitting yellow and blue.

The emission layers may be formed on the entire surface of the active region.

The size of the color filter is characterized in that corresponding to the size of the one sub-pixel.

The size of at least one of the sky blue or the deep blue color filter is greater than or equal to the sum of the sizes of the red and green color filters.

The method may further include forming a first hole transport layer and a second hole transport layer positioned between the first electrode and the light emitting layer.

The first hole transport layer is formed in a stripe shape on the substrate.

The first hole transport layer may be formed only in a row where the red color filter is located.

The second hole transport layer is positioned on the first hole transport layer, and is formed on the entire surface of the active region.

The organic light emitting display device according to the exemplary embodiment of the present invention forms a light emitting layer on the entire surface of the active region without using a shadow mask, thereby simplifying the process, reducing the manufacturing cost, and is easy to apply to mobile or large area. In addition, since pixels are distinguished by color filters, production is simpler than the structure of RGB.

In addition, by using the sky blue color filter, the light efficiency is increased compared to the case of using only the red, green, and blue color filters in the related art, and the polarizing plate can be removed because white light of the white sub-pixel with poor contrast is not used. The power consumption can be reduced, and the process can be reduced and the cost can be reduced. In addition, the full cavity structure of the red and green subpixels and the semi cavity structure of the deep blue and sky blue subpixels have an advantage of increasing light efficiency and reducing power consumption.

1 is a cross-sectional view showing a conventional organic light emitting display device.
2 is a plan view illustrating a conventional organic light emitting display device.
3 is a plan view illustrating an organic light emitting display device according to an embodiment of the present invention.
4 is a cross-sectional view taken along the line II ′ of FIG. 3.
FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 3.
6 is a view schematically illustrating the cavity effect of the organic light emitting display device of the present invention.
7A to 7D are cross-sectional views illustrating a method of manufacturing an organic light emitting display device according to the present invention.
8A to 8C are plan views illustrating a method of manufacturing an organic light emitting display device for each process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line II ′ of FIG. 3, and FIG. 5 is a line II-II ′ of FIG. 3. It is a cut section.

Referring to FIG. 3, the organic light emitting display device 100 of the present invention includes a plurality of red subpixels R, green subpixels G, deep blue subpixels DB, and sky blue subpixels SB. It consists of sub-pixels to form an active area (A / A) that implements an image.

The red subpixel R, the green subpixel G, the deep blue subpixel DB, and the sky blue subpixel SB include light emitting parts 200R, 200G, 200DB, and 200SB which emit white light. That is, the red light emitting unit 200R is formed in the red subpixel R, the green light emitting unit 200G is formed in the green subpixel G, and the deep blue light emitting unit 200DB is formed in the deep blue subpixel DB. ) Is formed, and the sky blue light emitting unit 200SB is formed in the sky blue sub-pixel SB. The light emitting units are labeled with colors, but it should be noted that all of the light emitting units emit white light.

The red subpixel (R), the green subpixel (G), the deep blue subpixel (DB), and the sky blue subpixel (SB) including the light emitting units may have red, green, deep blue and sky blue color filters. Arranged on the light emitting device to emit light corresponding to the color filter. In more detail, a red color filter 300R is positioned in the red subpixel R to emit red light, and a green color filter 300G is positioned in the green subpixel G to emit green light, and a deep blue sub A deep blue color filter 300DB is positioned in the pixel DB to emit deep blue light, and a sky blue color filter 300SB is positioned in the sky blue sub-pixel SB to emit sky blue light.

On the other hand, the plurality of subpixels are arranged in n columns and m rows, where n and m are natural numbers. Here, the red subpixel (R) and the green subpixel (G) are alternately arranged in the nth column, and the deep blue subpixel (DB) and the sky blue subpixel (SB) are alternately arranged in the n + 1th column. do. When the red subpixel R and the green subpixel G are viewed as one row, the red subpixel R and the green subpixel G are located in the nth column of the mth row, and n + 1. The deep blue subpixel DB is located in the first column. The red subpixel R and the green subpixel G are located in the n + 2th column, and the sky blue subpixel SB is located in the n + 3th column. In the next column, the n to n + 3th columns described above are repeated again.

Further, the red subpixel R and the green subpixel G are located in the nth column of the m + 1th row, and the sky blue subpixel SB is located in the n + 1th column. The red subpixel R and the green subpixel G are located in the n + 2th column, and the deep blue subpixel DB is located in the n + 3th column. In the next column, the n to n + 3th columns described above are repeated again. That is, the deep blue subpixel DB and the sky subpixel SB are alternately arranged in columns and rows. Accordingly, the red subpixel R and the green subpixel G are arranged in a column direction, that is, in a vertical line, and the deep blue subpixel DB and the sky blue subpixel SB are arranged in the red subpixel ( Arranged on the horizontal horizontal line of R) and the green sub-pixel G to prevent the mixing of the left and right viewing angles.

Here, each of the red subpixel R and the green subpixel G located in the nth column is smaller than the deep blue subpixel DB and the sky blue subpixel SB located in the n + 1th column. For example, the size of the deep blue subpixel DB or the sky blue subpixel SB is greater than twice the size of the red subpixel R or the green subpixel G to improve the efficiency of white light.

Looking at the organic light emitting display device 100 of the present invention in detail as follows. FIG. 4 shows red subpixels R and green subpixels G taken along line II ′ of FIG. 3, and FIG. 5 shows deep blue subpixels taken along II-II ′ of FIG. 3. ) And the sky blue subpixel (SB). 6 is a view schematically illustrating the cavity effect of the organic light emitting display device of the present invention.

4 and 5, a first electrode patterned for each of the red subpixel R, the green subpixel G, the deep blue subpixel DB, and the sky blue subpixel SB on the substrate 100. 120 is located. In an embodiment of the present invention, the first electrode 120 is made of a reflective electrode including a reflective film. The first electrode 120 may have a shape in which a reflective film is interposed between the transparent conductive films, or may have a shape in which a transparent conductive film is formed on the reflective film. The first electrode 120 is partitioned for each subpixel by the bank layer 125. The bank layer 125 has an opening 127 exposing the first electrode 120.

In addition, the first hole transport layer 130 is positioned on the first electrode 120. In more detail, the first hole transport layer 130 is positioned on the first electrode 120 of the red subpixel R, and the first hole transport layer is disposed on a part of the first electrode 120 of the deep blue subpixel DB. 130 is positioned, and the first hole transport layer 130 is positioned on a portion of the first electrode 120 of the sky blue subpixel SB. The formed position of the first hole transport layer 130 in more detail will be specified in the manufacturing method described later. Here, the first hole transport layer 130 is not formed in the green subpixel G, the remaining part of the deep blue subpixel DB, and the remaining part of the sky blue subpixel SB.

Meanwhile, the second hole transport layer 135 is positioned on the entire surface of the substrate 110 having the first hole transport layer 130 formed on a portion thereof, that is, on the entire surface of the active region. Unlike the first hole transport layer 130 described above, the second hole transport layer 130 is commonly formed on the entire surface of the active region, and may be made of the same material as the first hole transport layer 130.

The emission layer 140 is positioned on the second hole transport layer 135. The light emitting layer 140 emits white light and includes a yellow light emitting layer 142 and a blue light emitting layer 143. The yellow light emitting layer 142 and the blue light emitting layer 143 emit yellow light and blue light, respectively, and emit white light due to their color mixture. The yellow light emitting layer 142 and the blue light emitting layer 143 are commonly formed on the entire surface of the active region of the substrate 110 on which the second hole transport layer 135 is formed. The second electrode 150 is positioned on the light emitting layer 140. The second electrode 150 has a thin thickness to transmit the light emitted from the light emitting layer 140.

The color filter is positioned on the substrate 110 on which the second electrode 150 is formed. More specifically, the red color filter 300R is positioned at the red subpixel R, the green color filter 300G is positioned at the green subpixel G, and the deep blue color filter 300DB is located at the deep blue subpixel DB. ) And the sky blue color filter 300SB is located in the sky blue sub-pixel SB. Accordingly, the white light emitted from the light emitting layer of each subpixel passes through the red color filter 300R from the red subpixel R, and is converted into red light, and the green color filter 300G is transferred from the green subpixel G. Passed through the green light, the deep blue sub-pixel (DB) through the deep blue color filter (300DB) through the deep blue light, through the sky blue sub-pixel (SB) through the sky blue color filter (300SB) Your sky is converted to blue light. Thus, red, green, deep blue and sky blue light may be emitted to implement full color.

Meanwhile, the cavity effect of each subpixel according to the formation of the first hole transport layer described above will be described. Referring to FIG. 6, the first hole transport layer 130 is positioned on a part of the red subpixel R and the deep blue subpixel DB on the first electrode 120, which is a reflective electrode, and the second hole transport layer 135. ), The light emitting layer 140 and the second electrode 150 are located in front. Here, referring to the red subpixel R and the green subpixel G as an example, the height H1 of the red subpixel R on which the first hole transport layer 130 is formed is formed by the first hole transport layer 130. It is adjusted to be thicker than the green subpixel G which is not. That is, the height H1 is adjusted through the first hole transport layer 130 to form a height capable of exhibiting a full cavity effect in the red subpixel R. In addition, in the green subpixel G, the first hole transport layer 130 is not formed because the full cavity effect can be exhibited without the first hole transport layer 130. As a result, the red subpixel R and the green subpixel G can reflect red or green light wavelengths in a full cavity, thereby improving luminous efficiency.

In addition, since the first hole transport layer 130 is partially disposed in each of the deep blue subpixel DB and the sky blue subpixel SB, deep blue and sky blue wavelengths exist due to areas having different heights in the subpixel. It implements a semi cavity effect that reflects about half of.

Hereinafter, a manufacturing method of an organic light emitting display device according to an embodiment of the present invention described above will be described. In the following, the same reference numerals are assigned to the same components as those described in FIGS. 3 to 5 to make it easier to understand.

7A to 7D are cross-sectional views illustrating a method of manufacturing an organic light emitting display device according to the present invention, and FIGS. 8A to 8C are plan views illustrating a manufacturing method of an organic light emitting display device according to processes.

Referring to FIG. 7A, a transparent conductive film, such as indium tin oxide (ITO) or indium zinc oxide (IZO), is stacked and patterned on a substrate 100 to form a red subpixel R, a green subpixel G, and a deep blue. The first electrode 120 patterned for each of the subpixels DB and the sky blue subpixels SB is formed. In an embodiment of the present invention, the first electrode 120 is made of a reflective electrode including a reflective film. The first electrode 120 may have a shape in which a reflective film is interposed between the transparent conductive films, or may have a shape in which a transparent conductive film is formed on the reflective film. Here, the reflective film may be made of a metal having high reflectance such as aluminum (Al), silver (Ag), gold (Au), magnesium (Mg), calcium (Ca), and an alloy thereof.

Subsequently, the bank layer 125 may be formed by coating an organic material such as polyimide, benzocyclobutene series resin, and acrylate on the substrate 110 on which the first electrode 120 is formed. Form. A portion of the bank layer 125 is patterned to form an opening 127 exposing the first electrode 120.

Subsequently, the first hole transport layer 130 is formed on the substrate 110 on which the first electrode 120 is formed. The first hole transport layer 130 may play a role of smoothly transporting holes from the first electrode 120 to the light emitting layer, and may include NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine) and TPD (N). , N'-bis- (3-methylphenyl) -N, N'-bis- (phenyl) -benzidine), s-TAD and MTDATA (4,4 ', 4 "-Tris (N-3-methylphenyl-N- phenyl-amino) -triphenylamine) may be composed of one or more selected from the group consisting of, but is not limited thereto.

The first hole transport layer 130 is deposited using a shadow mask to be formed on the red subpixel R, a part of the deep blue subpixel DB, and a part of the sky blue subpixel SB. Here, the first hole transport layer 130 is not formed in the green subpixel G, the remaining part of the deep blue subpixel DB, and the remaining part of the sky blue subpixel SB.

Referring to FIG. 8A, the first hole transport layer 130 is formed in the horizontal direction in which the red subpixel R is formed in the active region A / A of the substrate 110. That is, the first hole transport layer 130 is formed on a portion of the red subpixel R, a portion of the deep blue subpixel DB, and a portion of the sky blue subpixel SB. In the active region A / A, the first hole transport layer 130 is formed in a stripe shape.

Subsequently, referring to FIG. 7B, a second hole transport layer 135 is formed on the substrate 110 on which the first hole transport layer 130 is formed. As shown in FIG. 8B, unlike the first hole transport layer 130 described above, the second hole transport layer 130 is commonly formed on the entire surface of the active region, and may be made of the same material as the first hole transport layer 130. have.

Subsequently, the emission layer 140 is formed on the second hole transport layer 135. In more detail, the yellow light emitting layer 142 is first formed, and the blue light emitting layer 143 is formed on the yellow light emitting layer 143. Here, the yellow light emitting layer 142 includes a host material including Alq3, and includes rubrene and 4- (dicyanomethylene) -2-methyl-6- (p-dimethylaminostyryl-4H-pyran (DCM1). A dopant material may be used, but the present invention is not limited thereto, and may be used as long as it emits yellow light, and the blue light emitting layer 143 may include a host material including CBP or mCP (4, 6). A dopant material including -F ₂ ppy) ₂ Irpic may be used, but is not limited thereto, and may be used as long as it emits blue light, and the yellow light emitting layer 142 and the blue light emitting layer 143 may be a second hole transport layer. It is formed in common on the entire active region of the substrate 110 on which the 135 is formed.

Next, a second electrode 150 is formed on the entire surface of the substrate 110 on which the emission layer 140 is formed. The second electrode 150 may be made of silver (Ag), magnesium (Mg), calcium (Ca), etc. as metals having a low work function, and may have a thin thickness to transmit light emitted from the light emitting layer 140. Is done.

Meanwhile, although not shown in the drawings in the present invention, a hole injection layer may be further formed between the first electrode 120 and the first hole transport layer 125. The hole injection layer is commonly located in front of the active region and includes cupper phthalocyanine (CuPc), poly (3,4) -ethylenedioxythiophene (PEDOT), polyaniline (PANI), and NPD (N, N-dinaphthyl-N, N'-diphenyl). benzidine) may be composed of any one or more selected from the group consisting of, but is not limited thereto.

In addition, at least one of an electron transport layer or an electron injection layer may be further formed between the emission layer 140 and the second electrode 150. The electron transport layer serves to facilitate the transport of electrons, and may be made of one or more selected from the group consisting of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq, but is not limited thereto. It doesn't work. The electron injection layer serves to facilitate the injection of electrons, and may use any one or more selected from the group consisting of LiF, Li, Ba, and BaF ₂ , but is not limited thereto.

7D and 8C, a color filter is formed on the substrate 110 on which the second electrode 150 is formed. More specifically, the red color filter 300R is formed in the red subpixel R, the green color filter 300G is formed in the green subpixel G, and the sky blue color filter is formed in the sky blue subpixel SB. To form 300SB. Although not shown in the drawing, a deep blue color filter 300DB is formed in the deep blue subpixel DB. Accordingly, the white light emitted from the light emitting layer of each subpixel passes through the red color filter 300R from the red subpixel R, and is converted into red light, and the green color filter 300G is transferred from the green subpixel G. Passed through the green light, the deep blue sub-pixel (DB) through the deep blue color filter (300DB) through the deep blue light, through the sky blue sub-pixel (SB) through the sky blue color filter (300SB) Your sky is converted to blue light. Thus, red, green, deep blue and sky blue light may be emitted to implement full color.

As described above, the organic light emitting display device according to the exemplary embodiment of the present invention forms a light emitting layer on the entire surface of the active region without using a shadow mask, thereby simplifying a process, reducing manufacturing cost, and being easy to apply to mobile or large area. Do. In addition, since pixels are distinguished by color filters, production is simpler than the structure of RGB.

In addition, by using the sky blue color filter, the light efficiency is increased compared to the case of using only the red, green, and blue color filters, and since the white color filter with poor light contrast is not used, the polarizing plate can be removed and power consumption is reduced. It can be reduced, process reduction and cost can be reduced. In addition, the full cavity structure of the red and green subpixels and the semi cavity structure of the deep blue and sky blue subpixels have an advantage of increasing light efficiency and reducing power consumption.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

110 substrate 120 first electrode
125: bank layer 130: first hole transport layer
135: second hole transport layer 140: light emitting layer
142: yellow light emitting layer 143: blue light emitting layer
150: second electrode 300R: red color filter
300G: Green Color Filter

Claims (18)

A substrate including an active region in which an image is displayed; And
A plurality of subpixels positioned on an active region of the substrate and including a light emitting layer interposed between a first electrode and a second electrode,
The plurality of subpixels are arranged in n columns and m rows (n, m are one or more natural numbers), and respective color filters corresponding to the respective subpixels are arranged.
The red and green color filters are alternately arranged in the nth column, and the sky blue and deep blue color filters are alternately arranged in the n + 1th column, and the size of the subpixel in the n + 1th column is located in the nth column. Larger than the size of the subpixel,
Further comprising a first hole transport layer and a second hole transport layer positioned between the first electrode and the light emitting layer,
And the first hole transport layer is disposed only in a row in which the red color filter, a part of the deep blue color filter, and a part of the sky blue color filter are disposed.
According to claim 1,
And the light emitting layer includes light emitting layers emitting yellow and blue light.
The method of claim 2,
And the light emitting layers are disposed on the entire surface of the active area.
According to claim 1,
And a size of the color filter corresponds to a size of the one subpixel.
According to claim 1,
And at least one of the sky blue and the deep blue color filters is greater than or equal to the sum of the sizes of the red and green color filters.
delete According to claim 1,
The first hole transport layer is an organic light emitting display device, characterized in that located on the substrate in the form of a stripe.
delete The method of claim 7, wherein
The second hole transport layer is disposed on the first hole transport layer, the organic light emitting display device, characterized in that located on the entire surface of the active area.
Providing a substrate comprising an active region;
Forming a plurality of subpixels including a light emitting layer interposed between a first electrode and a second electrode on an active region of the substrate; And
Forming a color filter corresponding to each of the plurality of sub-pixels;
The plurality of subpixels are arranged in n columns and m rows (n, m is a natural number of 1 or more),
The red and green color filters are alternately arranged in the nth column, and the sky blue and deep blue color filters are alternately arranged in the n + 1th column, and the size of the subpixel in the n + 1th column is located in the nth column. Larger than the size of the subpixel,
Further comprising a first hole transport layer and a second hole transport layer positioned between the first electrode and the light emitting layer,
And the first hole transport layer is disposed only in a row in which the red color filter, a part of the deep blue color filter, and a part of the sky blue color filter are disposed.
The method of claim 10,
The light emitting layer includes a light emitting layer for emitting yellow and blue light.
The method of claim 11, wherein
And the light emitting layers are formed on the entire surface of the active area.
The method of claim 10,
And the size of the color filter corresponds to the size of the one sub-pixel.
The method of claim 10,
The size of at least one of the sky blue or the deep blue color filter is greater than or equal to the sum of the sizes of the red and green color filters.
delete The method of claim 10,
And the first hole transport layer is formed in a stripe shape on the substrate.
delete The method of claim 10,
The second hole transport layer is disposed on the first hole transport layer, the method of manufacturing an organic light emitting display device, characterized in that formed on the entire surface of the active area.

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