KR100669772B1 - Electroluminescence display device - Google Patents

Abstract

The present invention provides a display device having a plurality of pixels for facilitating the deposition of the light emitting layer of each subpixel while improving the accuracy of the pattern, wherein each pixel is configured to emit red, green, and blue light, respectively. The subpixels may be disposed along one direction, and the subpixels included in the pixels in the one direction of the display apparatus may be arranged in the subpixels of pixels in which the color of light emitted by each subpixel is in contact with the one direction. The display device is characterized in that it is provided so as to be symmetrical with each other based on the arrangement of the color of the light emitted from the pixels.

Description

Display device {Electroluminescence display device}

1 is a plan view schematically showing a pattern of a light emitting layer of a conventional electroluminescent display device.

2 is a plan view schematically showing a mask used for depositing a blue light emitting layer of the electroluminescent display of FIG.

3 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to an exemplary embodiment of the present invention.

4 is a plan view schematically illustrating a mask used to deposit a blue light emitting layer of the electroluminescent display of FIG. 3.

5 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to another exemplary embodiment of the present invention.

FIG. 6 is a plan view schematically illustrating a mask used to deposit a blue light emitting layer of the electroluminescent display of FIG. 5. FIG.

FIG. 7 is a plan view schematically illustrating a mask used to deposit a red light emitting layer of the electroluminescent display of FIG. 5. FIG.

8 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to another exemplary embodiment of the present invention.

9 is a plan view schematically showing a mask used for depositing a blue light emitting layer of the electroluminescent display of FIG.

10 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to another preferred embodiment of the present invention.

FIG. 11 is a plan view schematically illustrating a mask used for depositing a blue light emitting layer of the electroluminescent display of FIG. 10. FIG.

12 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to another preferred embodiment of the present invention.

13 is a cross-sectional view showing an example of an electroluminescent unit.

14 is a cross-sectional view showing another example of the electroluminescent unit.

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

100: electroluminescent display device

110, 120, 130, 140: Pixel

110R, 120R, 130R, 140R: Red Light Emitting Layer

Green light emitting layer: 110G, 120G, 130G, 140G

110B, 120B, 130B, 140B: Blue light emitting layer

The present invention relates to a display device, and more particularly, to a display device for facilitating the deposition of the light emitting layer of each subpixel while improving the accuracy of the pattern.

Among the display devices, the electroluminescent display device has attracted attention as a next generation display device because of its advantages of having a wide viewing angle, excellent contrast, and fast response speed.

The electroluminescent display device includes an intermediate layer including at least a light emitting layer between the first electrode and the second electrode facing each other. In this case, the electrodes and the intermediate layer may be formed by various methods, one of which is deposition. In order to manufacture the electroluminescent display device using the deposition method, a mask having the same pattern as the pattern of the thin film to be formed on the surface on which the thin film is to be formed is brought into close contact with each other, and a thin film having a predetermined pattern is formed by depositing a material such as a thin film.

1 is a plan view schematically showing a pattern of a light emitting layer of a conventional electroluminescent display device, and FIG. 2 is a plan view schematically showing a mask used for depositing a blue light emitting layer of the electroluminescent display device of FIG.

Referring to FIG. 1, each pixel 11, 12, 13, and 14 of a conventional electroluminescent display device includes light emitting layers 11R, 12R, 13R, 14R, 11G, 12G, which emit red, green, and blue light. 13G, 14G, 11B, 12B, 13B, 14B). Three subpixels, each emitting red, green, and blue light, form one pixel.

As described above, the light emitting layer of the subpixels is formed through deposition using a mask, and the light emitting layer of the subpixels emitting light of any one of red, green, and blue colors, for example, the subpixels emitting red light, is formed. At the same time, the light emitting layer of sub-pixels emitting green light is formed through evaporation at the same time, and then the light emitting layer of sub-pixels emitting blue light is formed through evaporation. Therefore, in order to form the pattern of the blue light emitting layer of the electroluminescent display device as shown in FIG. 1, a mask 10Bm having openings 11Bm, 12Bm, 13Bm, and 14Bm as shown in FIG. 2 should be used. In addition, in order to form the pattern of the red and green light emitting layers of the electroluminescent display device as shown in FIG. 1, a mask having openings at the same interval as the mask 10Bm as shown in FIG. 2 should be used.

Meanwhile, in order to manufacture a high quality display device, the spacing between subpixels is narrower, and thus, the spacing between openings of a mask for depositing light emitting layers of the subpixels is narrower. That is, referring to FIG. 2, the distance l 0 between the openings 11Bm and 12Bm adjacent to each other in the x-axis direction becomes narrower. Although in FIG. 2 for convenience broadly showing the interval (l 0) between said openings, in fact, the spacing between the apertures (l 0) are very approximately as 0.068㎜ case of the EL display device of the QCIF-grade having a resolution of 140ppi small. Therefore, in order to implement a high-quality electroluminescent display device, it is essential to manufacture a high-definition mask having a smaller gap between the openings.

In addition, with high definition, the patterning of the mask and the alignment between the mask and the portion where the light emitting layer is to be deposited become more difficult, and due to a slight error, the overlapping with the light emitting layer emitting light of other adjacent colors occurs, etc. There was a problem.

In addition, in the display devices other than the electroluminescent display device, in the case of the display devices in which each sub-pixel is provided through vapor deposition, there are problems as described above.

The present invention has been made to solve various problems including the above problems, and an object of the present invention is to provide a display device that facilitates the deposition of the light emitting layer of each subpixel while improving the accuracy of the pattern.

In order to achieve the above object and various other objects, the present invention provides a display device having a plurality of pixels, each pixel of the sub-pixels emitting light of red, green and blue, respectively, in one direction. The subpixels included in the pixels in one direction of the display device may include an array of colors of light emitted by each subpixel of a pixel in which the color of light emitted by each subpixel is in contact with the one direction. Provided is a display apparatus, which is provided to be symmetrical with respect to each other based on pixels.

According to another aspect of the present invention, each of the subpixels includes a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode, and each other in the one direction. In the adjacent pixels, the light emitting layers of two subpixels which are in contact with each other based on the adjacent pixels may be integrally provided.

According to another feature of the present invention, the sub-pixels in the other direction forming an angle of 90 ° with the one direction may emit light of the same color.

According to another feature of the present invention, each of the subpixels includes a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode, and each other in the one direction. In the adjacent pixels, the light emitting layers of two subpixels which are in contact with each other based on the adjacent pixels may be integrally provided.

According to another feature of the invention, the light emitting layers of the sub-pixels in the other direction may be provided integrally.

According to another feature of the invention, the light emitting layer of the several sub-pixels in the other direction may be provided integrally.

According to still another feature of the present invention, at least one intermediate layer may be interposed between at least one of the first electrode and the light emitting layer and between the second electrode and the light emitting layer.

According to another feature of the present invention, in the sub-pixels adjacent to each other, the intermediate layer may have the same patterning as the light emitting layer.

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

3 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to a first preferred embodiment of the present invention, and FIG. 4 is a mask used to deposit a blue light emitting layer of the electroluminescent display device of FIG. 3. It is a top view which shows schematically. Although FIG. 3 schematically shows the pattern of the light emitting layer of the electroluminescent display device, it may be regarded as schematically showing each subpixel for convenience. The same is true in the embodiments to be described later.

Referring to FIG. 3, in an electroluminescent display device having a plurality of pixels 110, 120, 130, and 140, each pixel includes a subpixel emitting red light and a subpixel emitting green light. And sub-pixels emitting blue light in one direction, for example, in the x-direction of FIG. 3, and provided in the sub-pixels 110, 120, 130, and 140 in the x-direction of the electroluminescent display device. They are provided so that the arrangement of the color of the light emitted by each subpixel is symmetrical with respect to the arrangement of the color of the light emitted by each subpixel of the pixel in the x direction and between the pixels.

For example, in more detail as follows. The pixels 110, 120, 130, and 140 provided in a line along the x direction of FIG. 3 have subpixels that emit red, green, and blue light, respectively, along the x direction. For convenience, the pixels arranged in the top row of the light emitting layer (subpixel) pattern shown in FIG. 3 are respectively arranged along the x direction of FIG. 3 in the first pixel 110, the second pixel 120, and the first pixel. For example, the third pixel 130 and the fourth pixel 140 may include a subpixel 110R emitting red light along the x direction, and a subpixel 110G emitting green light. ) And a subpixel 110B for emitting blue light.

Meanwhile, subpixels are also provided in the second pixel 120, the third pixel 130, and the fourth pixel 140. In this case, an array of subpixels 120R, 120G, and 120B of the second pixel 120 adjacent to the first pixel 110 may be disposed between the first pixel 110 and the second pixel 120. As a reference, the first pixel 110 is provided to be symmetrical with the arrangement of the subpixels 110R, 110G, and 110B. That is, the arrangement of the subpixels 120R, 120G, and 120B that emits red, green, and blue light, respectively, of the second pixel 120 may be disposed between the first pixel 110 and the second pixel 120. Based on the reference, the first pixel 110 is symmetrical with the arrangement of the sub-pixels 110R, 110G, and 110B that emit red, green, and blue light, respectively. Accordingly, as shown in FIG. 3, the first pixel 110 emits red light along the x direction, the subpixel 110R, the subpixel 110G emitting green light, and the blue light. When the subpixel 110B emits light, the second pixel 120 adjacent to the first pixel 110 may include a subpixel 120B that emits blue light along the x direction and a green color. A subpixel 120G for emitting light and a subpixel 120R for emitting red light are provided.

An array of subpixels 130R, 130G, and 130B that emits red, green, and blue light, respectively, of the third pixel 130 may be disposed between the second pixel 120 and the third pixel 130. As a reference, the second pixel 120 is symmetrical with the arrangement of the subpixels 120R, 120G, and 120B that emit red, green, and blue light, respectively. Accordingly, as shown in FIG. 3, the second pixel 120 emits blue light along the x direction, the subpixel 120B, the subpixel 120G that emits green light, and the red light. Since the sub-pixel 120R emits light, the third pixel 130 adjacent to the second pixel 120 has a sub-pixel 130R emitting green light along the x direction, and A subpixel 130G for emitting light and a subpixel 130B for emitting blue light are provided.

The fourth pixel and the other pixels also have subpixels arranged in the same manner as described above, and as shown in FIG. 3, the subpixel emitting red light is R and the subpixel emitting green light. When G is a sub-pixel emitting blue light, B, R, G, B, B, G, R, R, G, B, B, R, G, ‥‥‥ Will have

Of course, such an arrangement is an example, and the arrangement of colors of light emitted by each subpixel may be symmetrical with respect to each other based on the pixels. Therefore, for example, the arrangement may be in the order of G, R, B, B, R, G, G, R, B, B, R, G, .... The same is true in the embodiments to be described later. Hereinafter, for convenience, an electroluminescent display device having an arrangement of subpixels as shown in FIG. 3 will be described.

In forming the light emitting layer of the electroluminescent display device in which subpixels are arranged as described above, for example, when depositing a light emitting layer emitting blue light, openings 110Bm, 120Bm, and 130Bm as shown in FIG. , A mask 100Bm having 140Bm is used. The mask used in depositing the light emitting layer emitting red light also has a form similar to that of the mask 100Bm shown in FIG. 4.

In the electroluminescent display device in which subpixels are arranged as described above, the subpixel 110B that emits blue light of the first pixel 110 may be a subpixel that emits blue light of the second pixel 120. The subpixel 120R, which is in contact with 120B and emits red light of the second pixel 120, is in contact with the subpixel 130R, which emits red light in the third pixel 130. That is, the subpixels that are in contact with each other based on the adjacent pixels are subpixels that emit light of the same color. Therefore, even if a slight error occurs in depositing the light emitting layers of the subpixels which are in contact with each other based on the adjacent pixels, the light emitting layer emits light of the same color so that it does not affect the image reproduction of the entire electroluminescent display device. do. Therefore, in manufacturing a high-definition and high-definition display device, it is possible to prevent a drop in yield due to a narrowing of the intervals between subpixels and to reduce production costs.

Meanwhile, in FIGS. 3 and 4, the sub-pixels in the other direction, that is, the y-direction, which form an angle of 90 ° with the x direction are illustrated as sub-pixels that emit light of the same color, but the present invention is not limited thereto. Do not. That is, as shown in Figure 3, the arrangement of subpixels arranged in the top row is R, G, B, B, G, R, R, G, B, B, G, R, ... And the arrangement of the subpixels arranged in the second row is also R, G, B, B, G, R, R, G, B, B, G, R, .... Alternatively, the arrangement of subpixels arranged in the top row is R, G, B, B, G, R, R, G, B, B, G, R, ... The arrangement of subpixels arranged in the second row is G, B, R, R, B, G, G, B, R, R, B, G, ..., etc. In the pixels in the x-direction of FIG. 3, the arrangement of the colors of the light emitted by each subpixel is sufficient so as to be symmetrical with respect to each other with respect to each pixel.

FIG. 5 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to a second exemplary embodiment of the present invention, and FIG. 6 is a mask used to deposit a blue light emitting layer of the electroluminescent display device of FIG. 5. 7 is a plan view schematically illustrating a mask used for depositing a red light emitting layer of the electroluminescent display of FIG. 5. Although FIG. 5 schematically shows the pattern of the light emitting layer of the electroluminescent display device as described above, it may be regarded as schematically showing each subpixel for convenience.

Referring to FIG. 5, in an electroluminescent display device having a plurality of pixels 210, 220, 230, and 240, each pixel includes a subpixel emitting red light and a subpixel emitting green light. And sub-pixels emitting blue light along one direction, for example, the x-direction of FIG. 5, and the sub-pixels provided in the pixels 210, 220, 230, and 240 in the x-direction of the electroluminescent display device. They are provided so that the arrangement of the color of the light emitted by each subpixel is symmetrical with respect to the arrangement of the color of the light emitted by each subpixel of the pixel in the x direction and between the pixels. That is, as described in the above-described first embodiment, the sub-pixels in the x-direction are for example R, G, B, B, G, R, R, G, B, B, G, R, ... It is provided.

In addition, the sub-pixels in the other direction forming the angle of 90 ° with the x direction, that is, the y-direction of FIG. 5 are sub-pixels that emit light of the same color. That is, as shown in Figure 5, the arrangement of subpixels arranged in the top row is R, G, B, B, G, R, R, G, B, B, G, R, ... If ..., the arrangement of subpixels arranged in the subsequent rows is R, G, B, B, G, R, R, G, B, B, G, R, ....

In the above configuration, the electroluminescent display device according to the present embodiment differs from the electroluminescent display device according to the first embodiment described above in the form of a light emitting layer.

Each of the subpixels includes a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode. In this case, the electroluminescent display device according to the present exemplary embodiment includes a light emitting layer of two subpixels which are in contact with each other based on the adjacent pixels in the pixels adjacent to each other in the x direction.

With reference to FIG. 5, it demonstrates in more detail. In the pattern of the light emitting layer (subpixel) illustrated in FIG. 5, the pixels arranged in the uppermost row are respectively arranged along the x direction of FIG. 5 in the first pixel 210, the second pixel 220, and the second pixel. If the third pixel 230 and the fourth pixel 240 are referred to, the first pixel 210 may have a subpixel 210R emitting red light along the x direction, and a subpixel 210G emitting green light. ) And a subpixel 210B that emits blue light. Of course, it may have a different order of arrangement, but will be described for the case having the arrangement of the above order for convenience.

In addition, the arrangement of the subpixels 220R, 220G, and 220B of the second pixel 220 adjacent to the first pixel 210 is referred to between the first pixel 210 and the second pixel 220. The first pixel 210 is provided to be symmetrical with the arrangement of the subpixels 210R, 210G, and 210B. Accordingly, the first pixel 210 includes a subpixel 210R that emits red light, a subpixel 210G that emits green light, and a subpixel 210B that emits blue light along the x direction. Will be provided.

In the above structure, a light emitting layer of subpixels adjacent to each other, that is, a subpixel emitting blue light of the first pixel 210, is disposed between the first pixel 210 and the second pixel 220. The light emitting layer 210B and the light emitting layer of the subpixel 220B emitting blue light of the second pixel 220 are integrally provided. In addition, the light emitting layer of sub-pixels adjacent to each other, that is, the sub-pixels emitting red light of the second pixel 220, may be formed based on the same structure between the second pixel 220 and the third pixel 230. The light emitting layer of 220R and the light emitting layer of the subpixel 230R emitting red light of the third pixel 230 are integrally provided. The above structure continues for the pixels in the x direction.

In the above structure, the mask used when forming the light emitting layer of the sub-pixels emitting blue light through vapor deposition is a mask 200Bm as shown in FIG. The mask used when forming the light emitting layer of the pixels through deposition is a mask 200Rm as shown in FIG. 7. 6 and 7, it can be seen that the size of the openings provided in each of the masks 200Bm and 200Rm is increased, and the gap l 2 between the openings is increased.

As described above, in order to deposit the light emitting layer according to the arrangement of the subpixels of the conventional electroluminescent display device as shown in FIG. 1, the mask 10Bm as shown in FIG. 2 should be used. In the conventional mask as described above, the interval l 0 between the openings 11Bm and 12Bm provided in the mask 10Bm is narrow, which makes it difficult to fix and align.

However, when the mask 200Bm as shown in FIG. 6 is used to deposit the light emitting layer according to the arrangement of the subpixels of the electroluminescent display device according to the present embodiment as shown in FIG. 5, as shown in FIG. 6. Similarly, the distance l 2 between the openings 220Bm and 230Bm provided in the mask 200Bm is approximately equal to the distance l 0 between the openings 11Bm and 12Bm provided in the conventional mask 10Bm. The area of each of the openings 220Bm and 230Bm provided in the mask 200Bm is also approximately twice the area of each of the openings 11Bm and 12Bm provided in the mask 10Bm. In the case of the QCIF class electroluminescent display device having a resolution of 140 ppi, the gap l 2 between the openings 220Bm and 230Bm is approximately 0.1368 mm, thus further reducing the gap between the openings. As a result, a high-quality electroluminescent display device can be realized.

FIG. 8 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to a third exemplary embodiment of the present invention, and FIG. 9 is a mask used to deposit a blue light emitting layer of the electroluminescent display device of FIG. 8. It is a top view which shows schematically.

Referring to FIG. 8, in an electroluminescent display device having a plurality of pixels 310, 320, 330, and 340, each pixel includes a subpixel emitting red light and a subpixel emitting green light. And sub-pixels emitting blue light in one direction, for example, in the x-direction of FIG. 8, and provided in the sub-pixels 310, 320, 330, and 340 of the x-direction of the electroluminescent display device. They are provided so that the arrangement of the color of the light emitted by each subpixel is symmetrical with respect to the arrangement of the color of the light emitted by each subpixel of the pixel in the x direction and between the pixels. That is, as described in the above embodiments, the sub-pixels in the x direction are provided as, for example, R, G, B, B, G, R, R, G, B, B, G, R, ... It is.

Each of the subpixels includes a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode. In this case, the electroluminescent display device according to the present embodiment is the same as the electroluminescent display device according to the second embodiment described above, and in the pixels adjacent to each other in the x direction, are in contact with each other based on the adjacent pixels. The light emitting layer of the two subpixels is integrally provided.

The electroluminescent display device according to the present embodiment differs from the electroluminescent display device according to the second embodiment described above in that the sub-pixels in the other direction forming an angle of 90 ° with the x direction, that is, the y pixel of FIG. It is not just the subpixels that emit light of the same color. That is, as shown in Fig. 8, for example, the arrangement of subpixels arranged in the top row (row, a) is R, G, B, B, G, R, R, G, B in the x direction. , B, G, R, ‥‥‥, the array of subpixels arranged in the second row (row, b) is R, G, B, B, G, R, R, G in the x direction Arrangements other than, B, B, G, R, ..., such as B, G, R, R, G, B, B, G, R, R, G, B, ... It may have the same arrangement as.

In such a structure, for example, the light emitting layer of the subpixels 310Ba, 320Ba, 330Ba, 340Ba, 310Bb, 320Bb, 330Bb, and 340Bb emitting blue light in the arrangement of the subpixels as shown in FIG. For deposition, a mask 300Bm with openings 310Bam, 320Bam, 330Bam, 340Bam, 310Bbm, 320Bbm, 330Bbm, 340Bbm as shown in FIG. 9 is used.

By providing the light emitting layer as described above, in order to form the light emitting layer through vapor deposition, as shown in FIG. 9, a mask provided with openings arranged in a zigzag form is used. As a result, it is possible to prevent the openings of the mask from being deformed when a tension is applied to the mask to prevent the mask from sag when the light emitting layer is deposited.

FIG. 10 is a plan view schematically illustrating a pattern of a light emitting layer of the electroluminescent display device according to a fourth preferred embodiment of the present invention, and FIG. 11 is a mask used to deposit a blue light emitting layer of the electroluminescent display device of FIG. 10. It is a top view which shows schematically.

Referring to FIG. 10, in an electroluminescent display device having a plurality of pixels 410, 420, 430, and 440, each pixel includes a subpixel emitting red light and a subpixel emitting green light. And sub-pixels emitting blue light along one direction, for example, the x-direction of FIG. 10, and the sub-pixels provided in the pixels 410, 420, 430, and 440 in the x-direction of the electroluminescent display device. They are provided so that the arrangement of the color of the light emitted by each subpixel is symmetrical with respect to the arrangement of the color of the light emitted by each subpixel of the pixel in the x direction and between the pixels. That is, as described in the above embodiments, the sub-pixels in the x direction are provided as, for example, R, G, B, B, G, R, R, G, B, B, G, R, ... It is.

Each of the subpixels includes a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode. In this case, the electroluminescent display device according to the present embodiment is the same as the electroluminescent display device according to the second and third embodiments described above, in the pixels adjacent to each other in the x direction, between the adjacent pixels. A light emitting layer of two subpixels which are in contact with each other based on the reference is integrally provided.

The electroluminescent display device according to the present embodiment differs from the electroluminescent display device according to the second and third embodiments described above in another direction forming an angle of 90 ° with the x direction, that is, the y direction in FIG. 10. The subpixels of are provided with subpixels emitting light of the same color, and in particular, the light emitting layer of the subpixels in the y direction is integrally provided.

With the above structure, for example, in order to deposit the light emitting layer of the subpixels 410B, 420B, 430B, and 440B which emit blue light in the arrangement of the subpixels as shown in FIG. A mask 400Bm with openings 410Bm, 420Bm, 430Bm, 440Bm as shown is used.

As described above, when the mask 400m having the openings as shown in FIG. 11 is used to form the emission layer through deposition by providing the emission layer, the mask 400Bm is provided as described above. The interval l 4 between the opened openings 420Bm and 430Bm is approximately twice the interval l 0 between the openings 11Bm and 12Bm provided in the conventional mask 10Bm, and the mask 400Bm The area of each of the openings 420Bm and 430Bm provided in the mask is also approximately twice the area of each of the openings 11Bm and 12Bm provided in the mask 10Bm. Therefore, the gap between the openings can be further reduced, and as a result, a high quality electroluminescent display device can be realized. In particular, by making the openings of the stripe pattern in the y direction, it is possible to facilitate the manufacture of the mask.

12 is a plan view schematically illustrating a pattern of a light emitting layer of an electroluminescent display device according to a fifth exemplary embodiment of the present invention.

The electroluminescent display device according to the present embodiment is different from the electroluminescent display device according to the fourth embodiment described above, as shown in FIG. 12, in the sub-pixels in the y direction, all the subpixels in the y direction. This light emitting layer is not formed integrally, the light emitting layer of the several sub-pixels in the y direction is formed integrally. In the structure as described above, the openings of the mask for depositing the light emitting layer have the same pattern. As described above, a tension is applied to the mask to prevent the mask from sagging in depositing the light emitting layer using the mask, and the openings of the mask may be deformed by the tension. In particular, according to the large area of the display device, such a phenomenon may be more easily generated, which may be more easily generated when openings having a long stripe pattern in one direction are provided.

 Accordingly, the mask does not have openings on the stripe corresponding to the light emitting layers of all the sub-pixels in the y direction, but instead correspond to the light emitting layers of the several sub-pixels in the y direction. By having the openings on the stripe in length, it is possible to manufacture a high-definition mask while preventing the deformation of the openings of the mask, thereby producing a high-quality electroluminescent display device.

In the above-described embodiments, each sub-pixel of the electroluminescent display device is said to have a first electrode and a second electrode facing each other, and a light emitting layer interposed between the first electrode and the second electrode, At least one intermediate layer may be interposed between at least one of the first electrode and the light emitting layer and between the second electrode and the light emitting layer. In this case, of course, in the subpixels adjacent to each other, the intermediate layer may have the same patterning as the light emitting layer.

The structure of the electroluminescent device provided in the electroluminescent display device according to the embodiments, including the intermediate layer as described above, will be briefly described with reference to FIGS. 13 and 14.

The electroluminescent device which may be provided in the electroluminescent display device according to the above embodiments is provided on the substrate 602, the substrate 602 may be a transparent glass material, in addition, acrylic, poly Mid, polycarbonate, polyester, mylar and other plastic materials can be used.

Electroluminescent devices can be applied in various forms, i.e., passive matrix (PM) electroluminescent devices of simple matrix type, or active matrix (AM) electroluminescent devices with thin film transistors. This can be applied to the present invention.

First, FIG. 13 illustrates an example of a passive type (PM type) electroluminescent device, in which a buffer layer 621 is formed on a substrate 602, for example, SiO _2, and on the buffer layer 621. The first electrode 631 is formed in a predetermined pattern, and the emission layer 633 and the second electrode 634 are sequentially formed on the first electrode 631. An insulating layer 632 may be further interposed between the lines of the first electrode 631, and the second electrode 634 may be formed in a pattern orthogonal to the pattern of the first electrode 631. . Although not shown in the drawings, a separate insulating layer may be further provided in a pattern orthogonal to the first electrode 631 for the pattern of the second electrode 634.

The emission layer 633 may be formed of an organic material or an inorganic material. In the case of an organic material, the light emitting layer 633 may be provided of a low molecular weight or a high molecular weight organic material. In case of using low molecular organic materials, a hole injection layer (HIL), a hole transport layer (HTL), an organic emission layer (EML), an electron transport layer (ETL), an electron injection layer (EIL) : Electron Injection Layer) can be formed by stacking single or complex structure, and usable organic materials are copper phthalocyanine (CuPc), N, N-di (naphthalen-1-yl) -N, N '-Diphenyl-benzidine (N, N'-Di (naphthalene-1-yl) -N, N'-diphenyl-benzidine: NPB), tris-8-hydroxyquinoline aluminum ( Alq3) can be used in various ways. These low molecular weight organic materials are provided by patterning as described above, and are formed by vacuum deposition using masks as described above.

In the case of the polymer organic material, the structure may include a hole transporting layer (HTL) and a light emitting layer (EML). In this case, PEDOT is used as the hole transporting layer, and PPV (Poly-Phenylenevinylene) and polyfluorene are used as the light emitting layer. Polymer organic materials such as (Polyfluorene) are used.

The first electrode 631 functions as an anode electrode, and the second electrode 634 functions as a cathode electrode. Of course, the polarities of these first electrodes 631 and the second electrodes 634 may be reversed.

The first electrode 631 may be provided as a transparent electrode or a reflective electrode. When used as a transparent electrode may be provided with ITO, IZO, ZnO or In ₂ O ₃ , when used as a reflective electrode Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr and compounds thereof After the reflection film is formed, or the like, ITO, IZO, ZnO, or In ₂ O ₃ can be formed thereon.

The second electrode 634 may also be provided as a transparent electrode or a reflective electrode. When the second electrode 634 is used as a transparent electrode, the second electrode 634 is used as a cathode, and thus a metal having a small work function, that is, Li, Ca, or LiF. / Ca, LiF / Al, Al, Mg and their compounds are deposited to face the organic film 633, and then supplemented with a material for forming a transparent electrode such as ITO, IZO, ZnO, or In ₂ O ₃ thereon. Electrodes or bus electrode lines can be formed. When used as a reflective electrode, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, and compounds thereof are formed by full deposition.

14 illustrates an example of an AM type electroluminescent device. Each subpixel has at least one thin film transistor (TFT) as shown in FIG.

The thin film transistor is not necessarily limited to the structure shown in FIG. 14, and the number and structure may be variously modified. The active driving electroluminescent device will be described in more detail as follows.

As shown in FIG. 14, a buffer layer 621 is formed on the glass substrate 602, for example, SiO ₂ , and the thin film transistor is disposed above the buffer layer 621.

The thin film transistor includes an active layer 622 formed on the buffer layer 621, a gate insulating layer 623 formed on the active layer 622, and a gate electrode 624 on the gate insulating layer 623. A gate electrode 624 is formed in a predetermined region above the gate insulating layer 623. The gate electrode 624 is connected to a gate line for applying a thin film transistor on / off signal. The region where the gate electrode 624 is formed corresponds to the channel region of the active layer 622.

An inter-insulator 625 is formed on the gate electrode 624, and the source and drain regions of the active layer 622 are respectively formed by the source electrode 626 and the drain electrode 627 through contact holes. It is formed to be in contact with.

A passivation film 628 made of SiO ₂ or the like is formed on the source electrode 626 and the drain electrode 627, and a pixel definition film 629 is formed on the passivation film 628 by acrylic, polyimide, or the like. Is formed. The passivation film 628 may serve as a protective film for protecting the thin film transistor, or may serve as a planarization film for planarizing an upper surface thereof.

Although not shown in the drawings, at least one capacitor is connected to the thin film transistor. The circuit including the thin film transistor is not necessarily limited to the example illustrated in FIG. 14, and may be variously modified.

On the other hand, an electroluminescent element is connected to the drain electrode 627. The first electrode 631 of the electroluminescent device is formed on the passivation film 628, and an insulating pixel definition film 629 is formed on the upper portion of the passivation film 628, and is provided on the pixel definition film 629. The light emitting layer 633 or the like is formed in the predetermined opening. In FIG. 14, the light emitting layer 633 is patterned so as to correspond only to the subpixels. However, the light emitting layer 633 is illustrated as such for convenience of description of the configuration of each subpixel, and as described in the above-described embodiments, The light emitting layer 633 may be formed integrally with the light emitting layer of the adjacent subpixel.

The materials of the first electrode 631 and the second electrode 634, the light emitting layer 633 interposed between the electrodes, and an intermediate layer (not shown) of the upper and lower portions of the light emitting layer are the same as those of the passive driving type electroluminescent device described above. can do.

The electroluminescent element formed on the board | substrate 602 is sealed by the opposing member (not shown). The opposing member may be formed of glass or plastic material in the same manner as the substrate 602. In addition, the opposing member may be formed of a metal cap or the like.

In the electroluminescent display device provided with the electroluminescent elements having the above structure, the light emitting layer or the intermediate layers of the display device to have the same structure as the above-described embodiments, it is easy to deposit the light emitting layer of each sub-pixel, etc. It is possible to manufacture a high-quality electroluminescent display device to improve the accuracy of the pattern while being made.

In addition, although the present invention has been described with reference to the structure of the electroluminescent display device in the above embodiments, the present invention may be applied to any display device as long as the display devices each subpixel is provided through deposition.

According to the display device of the present invention made as described above, the following effects can be obtained.                     

First, in the pixels in one direction, the arrangement of colors of light emitted from each subpixel based on the adjacent pixels are symmetrical to each other, thereby reducing the difficulty of mask fabrication and alignment. In manufacturing a high-definition display device, it is possible to prevent a drop in yield due to a narrow interval between subpixels and to reduce production costs.

Secondly, in the above structure, the light emitting layers of the subpixels which are in contact with each other based on the adjacent pixels are integrally formed, thereby increasing the size of the openings provided in the mask for forming the light emitting layer and between the openings. Can widen the gap.

Third, by adopting the structure as described above, it is possible to easily manufacture a high-definition mask, it is possible to manufacture a high-quality display device using such a mask.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (8)

In the display device having a plurality of pixels, each pixel includes sub-pixels that emit light of red, green, and blue, respectively, in one direction, and is provided in the pixels of the one direction of the display device. The pixels are arranged such that the arrangement of colors of light emitted by each subpixel is symmetrical with respect to the arrangement of the colors of light emitted by each subpixel of the pixel in one direction and the pixels. . The method of claim 1, Each subpixel is A first electrode and a second electrode facing each other; And A light emitting layer interposed between the first electrode and the second electrode; And a light emitting layer of two subpixels which are in contact with each other based on the adjacent pixels in the pixels adjacent to each other in the one direction. The method of claim 1, And the sub-pixels in the other direction forming an angle of 90 ° with the one direction emit light of the same color. The method of claim 3, wherein Each subpixel is A first electrode and a second electrode facing each other; And A light emitting layer interposed between the first electrode and the second electrode; And a light emitting layer of two subpixels which are in contact with each other based on the adjacent pixels in the pixels adjacent to each other in the one direction. The method of claim 4, wherein The light emitting layer of the sub-pixels in the other direction is integrally provided. The method of claim 4, wherein And a light emitting layer of several subpixels in the other direction is integrally provided. The method according to any one of claims 2 and 4 to 6, And a hole injection layer or a hole transporting layer is interposed between the first electrode and the light emitting layer, and an electron transporting layer or an electron injection layer is interposed between the second electrode and the light emitting layer. The method of claim 7, wherein The subpixels adjacent to each other, wherein the layer interposed between the first electrode and the light emitting layer and the layer interposed between the second electrode and the light emitting layer have the same patterning as the light emitting layer.

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