KR101479994B1 - Organic light emitting diode display and method for manufacturing the same - Google Patents

Abstract

The present invention provides a liquid crystal display device including a first pixel electrode and a plurality of first pixels, a second pixel electrode, and a second pixel electrode formed on the first pixel electrode and including a light emitting layer for displaying a first color, And a plurality of third pixels including a third pixel electrode and a light emitting layer formed on the third pixel electrode and displaying a third color, Wherein the first pixel and the plurality of second pixels are alternately arranged along a first column and the plurality of third pixels are arranged continuously along a second column, An organic light emitting diode (OLED) display device, and a method of manufacturing the same.

Organic light emitting display, luminescent layer, shadow mask, shadow effect, aperture ratio

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display device,

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

A cathode ray tube (CRT) has been replaced by a liquid crystal display (LCD) in accordance with such a demand.

However, a liquid crystal display device requires not only a backlight but also a response speed and a viewing angle.

Recently, organic light emitting diode (OLED) displays have been attracting attention as display devices capable of overcoming these limitations.

The organic light emitting display includes two electrodes and a light emitting layer disposed therebetween. Electrons injected from one electrode and holes injected from the other electrode are combined in the light emitting layer to form an exciton And the exciton emits light while emitting energy.

The plurality of light emitting layers each displaying red, green, and blue may represent a full color, and may be a stripe structure in which light emitting layers displaying the same color are arranged in a row.

 The light emitting layer having such a stripe structure can be formed using a shadow mask. At this time, the shadow mask has a plurality of openings having substantially the same shape and size as those of the light emitting layer to be formed, and a plurality of light emitting layers arranged in a line can be formed at one time by depositing an organic material through the openings.

However, in this case, the interval between the openings arranged in a line and the openings is narrow, so that the edge portions of the openings of the shadow mask can not be finely manufactured. Accordingly, when an organic material is deposited through the opening, a shadow effect may occur in which an organic material is not precisely deposited at a portion contacting the edge of the opening. In this case, the area of the light- And the opening ratio may be lowered.

Accordingly, an object of the present invention is to reduce the shadow effect and improve the aperture ratio of the organic light emitting display device.

According to an embodiment of the present invention, an OLED display includes a first pixel electrode, a plurality of first pixels, a second pixel electrode, and a second pixel electrode, the first pixel electrode being formed on the first pixel electrode and including a light- A plurality of second pixels formed on the two pixel electrodes and including a light emitting layer for displaying a second color, and a plurality of second pixels formed on the third pixel electrodes and the third pixel electrode, Wherein the plurality of first pixels and the plurality of second pixels are alternately arranged along a first column and the plurality of third pixels are arranged continuously along a second column, The light emitting layer of the third pixel overlaps at least two neighboring third pixel electrodes.

The third pixel may have a larger area than the first pixel and the second pixel.

The first pixel and the second pixel may be alternately arranged along the first column.

The first pixel and the second pixel may be alternately arranged in two along the first column.

The light emitting layer of the first pixel may overlap with at least two neighboring first pixel electrodes.

The light emitting layer of the second pixel may overlap with at least two neighboring second pixel electrodes.

The first color may be red, the second color may be green, and the third color may be blue.

An organic light emitting display according to another embodiment of the present invention includes a plurality of first pixels including a light emitting layer for displaying a first color, a plurality of second pixels including a light emitting layer for displaying a second color, Wherein the plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, and the plurality of third pixels are arranged in a second column And the light emitting layers of at least two third pixels may be connected to each other.

The first color may be red, the second color may be green, and the third color may be blue.

The light emitting layers of the at least two first pixels may be connected to each other.

The light emitting layers of the at least two second pixels may be connected to each other.

The third pixel may have a larger area than the first pixel and the second pixel.

The organic light emitting display according to another embodiment of the present invention includes a plurality of red pixel groups arranged in a 2x2 matrix and including four red pixels sharing one red light emitting layer, A plurality of green pixel groups including four green pixels sharing a green light emitting layer and a plurality of blue pixel groups including four blue pixels arranged in a 2x2 matrix and sharing one blue light emitting layer, The red pixel group and the green pixel group are alternately arranged to form a first column, and the blue pixel group is continuously arranged to form a second column, and the first column and the second column are alternately arranged.

The arrangement of the pixel groups of the first two columns positioned on both sides of the second column may be the same.

The position of the red pixel group and the position of the green pixel group may be shifted from each other in two first columns located on both sides of the second row.

The organic light emitting display according to another embodiment of the present invention includes a plurality of first, second, and third pixels that display different colors, and the plurality of first pixels and the plurality of second pixels include The plurality of third pixels are successively arranged along a second column, and the interval between the third pixels is an interval between the first pixel and the second pixel .

The first pixel, the third pixel, the second pixel, and the third pixel may be alternately arranged along a row.

The first, second, and third pixels may not include portions arranged consecutively along rows or columns, respectively.

And an interval between the first pixel and the third pixel may be substantially equal to an interval between the second pixel and the third pixel or an interval between the first pixel and the second pixel.

The first, second, and third pixels may display red, green, and blue, respectively.

A method of manufacturing an organic light emitting display according to an embodiment of the present invention includes forming a plurality of pixel electrodes on a substrate, forming a plurality of first, second, Forming a first electrode, a second electrode, and a third light emitting layer on the first light emitting layer, and forming a common electrode on the first, second and third light emitting layers, Forming the plurality of first light emitting layers using a first mask having a plurality of first openings, forming the plurality of second light emitting layers at neighboring positions of the first light emitting layer using the first mask Forming a plurality of third light emitting layers at neighboring positions of the first light emitting layer and the second light emitting layer using a second mask having a plurality of second openings different in size from the first openings,It should.

The third light emitting layer may overlap with at least two neighboring pixel electrodes.

At least one of the first light emitting layer and the second light emitting layer may overlap with at least two neighboring pixel electrodes.

The second opening may be larger in area than the first opening.

According to another aspect of the present invention, there is provided a method of manufacturing an organic light emitting display, including: forming a plurality of pixel electrodes on a substrate; forming a plurality of light emitting layers on the pixel electrodes; Wherein the step of forming the light emitting layer includes sequentially forming a plurality of first light emitting layers, a plurality of second light emitting layers, and a plurality of third light emitting layers that emit different colors, wherein the first light emitting layer, And the third light emitting layer may be formed to overlap with at least two pixel electrodes.

The first light emitting layer and the second light emitting layer are formed using a first mask having a plurality of first openings and the third light emitting layer is formed using a second mask having a plurality of second openings larger than the first openings .

It is possible to prevent the shadow effect that may occur due to the limitation of the shadow mask, thereby preventing the light emitting area and the aperture ratio from being reduced even in the large area organic light emitting display device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

[Example 1]

An organic light emitting display according to an embodiment of the present invention will now be described in detail with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a plan view schematically showing the arrangement of a plurality of pixels in an organic light emitting display according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II'-II ' 1, an OLED display according to an embodiment of the present invention includes a red pixel R for displaying red, a green pixel G for displaying green, and a red And a blue pixel B for displaying are arranged. The red pixel R, the green pixel G and the blue pixel B are basic pixels for expressing full color, and the three pixels are grouped and repeated along rows and columns.

More specifically, the arrangement of the red pixel R, the green pixel G and the blue pixel B is such that a plurality of red pixels R and a plurality of green pixels G are alternately arranged along a first column And the plurality of blue pixels B are arranged continuously along the second row.

The red pixel R and the blue pixel B are alternately arranged along a row and the green pixel G and the blue pixel B are alternately arranged along the row.

According to this arrangement, there is no portion where the red pixel R, the green pixel G and the blue pixel B are successively arranged side by side along the column or row direction.

At this time, the interval b between the adjacent blue pixels B is larger than the interval a between the red pixel R and the green pixel G. The distance a between the red pixel R and the green pixel G is set to be equal to the distance between the red pixel R and the blue pixel B or between the distance between the green pixel G and the blue pixel B, .

The red pixel R and the green pixel G may have substantially the same area and the blue pixel B may have a larger area than the red pixel R and the green pixel G. [ At this time, when the red pixel R and the green pixel G are bisected on the basis of one group including the red pixel R, the green pixel G and the blue pixel B, (B) is positioned on the post, the above-mentioned area ratio can be adjusted. However, the arrangement of the pixels can be variously modified.

Since the blue pixel B is formed to be larger than the red pixel R and the green pixel G as described above, the blue light-emitting layer is less liable to have a lower luminous efficiency and a shorter lifetime than the red and green light- The luminance of the pixels R, G, and B can be balanced.

Referring to FIG. 2, an OLED display device having a pixel arrangement according to an exemplary embodiment of the present invention includes pixel electrodes 191R, 191G, and 191B formed on an insulating substrate 110, organic light emitting layers 370R, 370G, and 370B And a common electrode 270. The pixel electrodes 191R, 191G and 191B, the organic light emitting layers 370R, 370G and 370B and the common electrode 270 form an organic light emitting diode (OLED). And an insulating film 361 for insulating the pixel electrodes 191R, 191G, and 191B from the common electrode 270. A plurality of signal lines including a gate line, a data line, and a driving voltage line, And a driving transistor connected to the switching transistor, the driving voltage line, the switching transistor, and the pixel electrodes 191R, 191G, and 191B connected to the data lines.

Hereinafter, a method of manufacturing the OLED display of FIGS. 1 and 2 will be described with reference to FIGS. 3A and 5 together with FIGS. 1 and 2. FIG.

FIGS. 3A and 3B are schematic views showing masks used for forming an organic light emitting layer in a method of manufacturing an organic light emitting display according to an embodiment of the present invention. FIGS. 4A to 4C are cross- Fig. 5 is a cross-sectional view taken along the line VV in Fig. 4A. Fig.

Referring to FIG. 2, a plurality of pixel electrodes 191R, 191G, and 191B are formed on an insulating substrate 110, and an insulating film 361 is formed thereon. At this time, the insulating film 361 has a plurality of openings 365 for exposing the pixel electrodes 191R, 191G, and 191B.

Next, organic light emitting layers 370R, 370G, and 370B are formed in the openings 365, respectively.

The organic light emitting layers 370R, 370G, and 370B can be formed by a deposition method using a shadow mask.

Referring to FIG. 3, in one embodiment of the present invention, two masks 10 and 20 are required for depositing the organic light emitting layers 370R, 370G, and 370B. The first mask 10 has a plurality of openings 10a having a substantially square shape as shown in FIG. 3A, and the second mask 20 has a larger area than the opening 10a, as shown in FIG. 3B, And has a plurality of rectangular openings 20a.

4A and FIG. 5, the first mask 10 is disposed on the substrate 110 on which the pixel electrodes 191R, 191G, and 191B and the insulating film 361 are formed. A red light emitting material 370R is formed on the pixel electrode 191R by depositing a red light emitting material 50 through the opening 10a of the first mask 10.

Referring to FIG. 4B, the first mask 10 is moved by a predetermined distance, and a green light emitting material is deposited on the pixel electrode 191G through the opening 10a to form a green light emitting layer 370G.

Referring to FIG. 4C, a second mask 20 is disposed on the substrate 110, and a blue light emitting material is deposited on the pixel electrode 191B through the opening 20a to form a blue light emitting layer 370B.

The red light emitting layer 370R and the green light emitting layer 370G are formed by using the first mask 10 and the blue light emitting layer 370B is formed by using the second mask 20 in the embodiment of the present invention.

At this time, the red light emitting layer 370R and the green light emitting layer 370G are formed at positions alternately arranged along the first column and the blue light emitting layer 370B is formed at a position continuously arranged along the second column adjacent to the first column do. The interval between the neighboring blue light emitting layers 370B is formed to be larger than the interval between the red light emitting layer 370R and the green light emitting layer 370G.

In the embodiment of the present invention, the organic light emitting layer can be formed using a mask having a sufficient space between the openings by having such pixel arrangement. When a mask having a sufficient gap between the openings is used, the edges of the openings can be finely fabricated, so that the organic material can be precisely deposited to a portion where the organic material is deposited through the openings to the edge of the openings. In this case, since the organic light emitting layer having almost the same size as the opening of the mask can be formed, the light emitting area and the aperture ratio can be ensured.

The effects of the present invention can be explained by comparing with the organic light emitting diode display of the conventional stripe structure.

An organic light emitting display device having such a stripe structure and a manufacturing method thereof will be described with reference to FIGS. 6 to 9. FIG.

FIG. 6 is a plan view schematically showing the arrangement of a plurality of pixels in an organic light emitting diode display of a stripe structure, FIG. 7 is a schematic view showing a mask used for forming an organic light emitting layer in a stripe structure organic light emitting display, FIG. 8C is a schematic view sequentially showing a method of forming an organic light emitting layer when the organic light emitting display device having a stripe structure is manufactured, and FIG. 9 is a sectional view taken along the line XI-XI in FIG. 8A.

Referring to FIG. 6, in the organic light emitting diode display of the stripe structure, a plurality of red pixels R are successively arranged along the first column and a plurality of green pixels G are arranged continuously along the second column A plurality of blue pixels B are successively arranged along the third row. In the row direction, a red pixel R, a green pixel G and a blue pixel B are arranged side by side to form one group.

A method of manufacturing an organic light emitting display having such a stripe structure will be briefly described with reference to FIGS. 7 to 9. FIG. The same portions as those of the above-described embodiment are omitted.

Referring to FIG. 7, in the organic light emitting diode display of the stripe structure, one mask may be used for depositing the organic light emitting layer. That is, since the red, green, and blue light emitting layers 370R, 370G, and 370B have the same shapes and sizes, they can be all deposited using the same mask 30. At this time, the mask 30 has a plurality of openings 30a having a substantially rectangular shape, and the plurality of openings 30a are spaced apart from the openings 10a and 20a of the masks 10 and 20 according to the embodiment of the present invention And are arranged along the rows.

8A and 9, the third mask 30 is disposed on the substrate 110 on which the pixel electrode 191R and the insulating film 361 are formed. A red light emitting material 370R is formed on the pixel electrode 191R by depositing a red light emitting material 50 through the opening 30a of the third mask 30.

Referring to FIG. 8B, the third mask 30 is moved by a predetermined distance, and a green light emitting material is deposited on the pixel electrode 191G through the opening 30a to form a green light emitting layer 370G.

Referring to FIG. 8C, the third mask 30 is moved by a predetermined distance, and a blue light emitting material is deposited on the pixel electrode 191B through the opening 30a to form a blue light emitting layer 370B.

As described above, in the organic light emitting diode display of the stripe structure, one mask 30 can be moved three times to form the red, green and blue light emitting layers 370R, 370G and 370B. At this time, the interval between the openings 30a and the openings 30a arranged in the same column in the mask 30 is narrow, so that the edges of the openings can not be finely manufactured at the time of mask production.

Referring to FIG. 9, when the gap between the opening 30a and the opening 30a is narrow, the mask must be etched on both sides of the mask to form the opening. In this case, the edge of the opening is not finely formed, And can be formed in a cross-sectional shape. In this case, when an organic material is deposited through the opening 30a, a shadow effect that an organic material can not be deposited occurs at the portions 15a and 15b that contact the edge of the opening, thereby reducing the area of deposition of the organic material. Accordingly, the organic emission layer actually formed is formed to have an area smaller than the size of the opening, so that the emission area and the aperture ratio are inevitably lowered.

5 and 9, the deposition area of the organic light emitting layer formed according to one embodiment of the present invention is larger than the deposition area of the organic light emitting layer formed in the stripe structure organic light emitting display, so that the light emitting area and the aperture ratio are improved .

[Example 2]

Hereinafter, an OLED display according to another embodiment of the present invention will be described in detail with reference to FIGS. 10 and 11. FIG.

FIG. 10 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention. FIG. 11 is a plan view showing a red pixel R, a green pixel G, And a blue pixel B according to the first embodiment of the present invention.

Referring to FIG. 10, the arrangement of pixels in the OLED display according to the present embodiment will be described. In the same manner as in the previous embodiment, a plurality of red pixels R and a plurality of green pixels G are alternately And the plurality of blue pixels B are arranged continuously along the second row.

The red pixel R and the blue pixel B are alternately arranged along a row and the green pixel G and the blue pixel B are alternately arranged along the row.

The distance d between the red pixel R and the green pixel G is equal to the distance between the red pixel R and the blue pixel B or between the green pixel G and the blue pixel B, And the two adjacent blue pixels B ₁ and B _{2 are} referred to as one blue pixel group, the interval f between the neighboring blue pixel groups is equal to the distance between the red pixel R and the green pixel G, (D).

In this embodiment, unlike the above-described embodiment, the light emitting layers 370B of two neighboring blue pixels B ₁ and B ₂ are formed in a single pattern. In other words, the light emitting layer 370B of the blue pixel B overlaps with two neighboring pixel electrodes 191B ₁ and 191B ₂ .

10 and 11, a red light emitting layer 370R is formed on the pixel electrode 191R in the red pixel R, and a green light emitting layer 370G is formed on the pixel electrode 191G in the green pixel G have. On the other hand, the blue pixel B includes two adjacent blue pixels B ₁ and B ₂ , that is, a light emitting layer 370B of the first blue pixel B ₁ and the second blue pixel B ₂ , Pattern. At this point, the light emitting layer (370B ₁₎ and a part of the blue emission layer (370B) a second light-emitting layer of a blue pixel (B ₂₎ (370B ₂₎ of a portion of the blue light-emitting layer (370B) a first blue pixel (B _1). This can be achieved by depositing a blue light emitting layer 370B using a shadow mask having openings of a size corresponding to the sum of the light emitting areas of the neighboring first and second blue pixels B ₁ and B ₂ have. This will be described later.

At this time, since the emission layers 370B of the first and second blue pixels B ₁ and B ₂ adjacent to each other are one pattern, they do not have an interval therebetween, and the neighboring first blue pixels B ₁ and second a blue pixel (B ₂₎ distance (e) between the pixel electrodes (191B ₂₎ of the pixel electrodes (191B ₁₎ and a second blue pixel (B ₂₎ of substantially the first blue pixel (B ₁₎ the spacing between . At this time _, the interval e between the pixel electrodes 191B _{1 and} 191B ₂ is independent of the shadow mask used for depositing the light emitting layer 370B, so that the shadow effect of reducing the light emitting area due to the limitation of the shadow mask can be prevented.

10 and 11 will be described with reference to FIGS. 12A to 13C together with FIGS. 10 and 11. FIG.

FIGS. 12A and 12B are schematic views showing masks used for forming an organic light emitting layer in the method of manufacturing an organic light emitting display according to another embodiment of the present invention. FIGS. 13A to 13C are cross- A method of forming an organic light-emitting layer when the device is manufactured.

Referring first to FIG. 11, forming a plurality of pixel electrodes _{(191R, 191G, 191B 1,} 191B 2) on an insulating substrate 110 and laminating the insulation film 361 thereon. At this time, the insulating film 361 has a plurality of openings 365 for exposing the pixel electrodes 191R, 191G, 191B ₁ , and 191B ₂ .

Next, organic light emitting layers 370R, 370G, and 370B are formed in the openings 365, respectively.

The organic light emitting layers 370R, 370G, and 370B can be formed by a deposition method using a shadow mask.

12A and 12B, in the embodiment of the present invention, two masks 40 and 50 are required for depositing the organic light emitting layers 370R, 370G and 370B. The fourth mask 40 has a plurality of openings 40a having a substantially square shape as shown in Fig. 12A. This is because the fourth mask 40 has a plurality of openings 40a, which are used for depositing the red light emitting layer 370R and the green light emitting layer 370G in the above- May be the same as the mask 10. The fifth mask 50 has a plurality of openings 50a having a larger area and an approximately rectangular shape than the openings 40a of the fourth mask 40 as shown in Fig. 12B.

13A, the fourth mask 40 is disposed on the substrate 110 on which the pixel electrodes 191R, 191G, 191B ₁ , and 191B ₂ and the insulating film 361 are formed. A red luminescent material is deposited on the pixel electrode 191R through the opening 40a of the fourth mask 40 to form a red luminescent layer 370R in the same manner as in the above embodiment.

Referring to FIG. 13B, the fourth mask 40 is moved by a predetermined distance, and a green light emitting material is deposited on the pixel electrode 191G through the opening 40a to form a green light emitting layer 370G.

Next, referring to FIG. 13C, a fifth mask 50 is disposed on the substrate 110, and a blue light emitting material 370B is formed on the pixel electrodes 191B ₁ and 191B ₂ by depositing a blue light emitting material through the opening 50a do. The blue light emitting layer 370B is formed to have a size overlapping the two pixel electrodes 191B ₁ and 191B ₂ .

In this embodiment, the red light emitting layer 370R and the green light emitting layer 370G are formed using the fourth mask 40, and the two adjacent blue light emitting layers 370B ₁ and 370B _{2 are} formed by the fifth mask 50 To form a single pattern.

In the embodiment of the present invention, an organic light emitting layer can be formed by using the mask having a sufficient space between the openings by forming the organic light emitting layer by the above-described method. When a mask having a sufficient gap between the openings is used, the edges of the openings can be finely fabricated, so that the organic material can be precisely deposited to a portion where the organic material is deposited through the openings to the edge of the openings.

Particularly, in this embodiment, when the light emitting layers of two neighboring blue pixels are formed in one pattern, the shadow effect that can occur due to the limitation of the shadow mask described above can be prevented. Therefore, it is possible to prevent the light emitting area and the aperture ratio from being reduced by the distance between the light emitting layers.

[Example 3]

Hereinafter, an OLED display according to another embodiment of the present invention will be described in detail with reference to FIGS. 14 and 15. FIG.

FIG. 14 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention. FIG. 15 is a plan view showing a red pixel R, a green pixel G ) And a blue pixel (B).

Referring to FIG. 14, the pixel arrangement of the organic light emitting diode display according to the present embodiment will be described. In the same manner as in the previous embodiment, the red pixel R and the blue pixel B are alternately arranged along a row, And the blue pixel B are alternately arranged along the row.

At this time, the interval g between the red pixel R and the green pixel G, the gap g between the red pixel R and the blue pixel B and the interval g between the green pixel G and the blue pixel B G " are substantially the same. When two neighboring blue pixels B ₁ and B _{2 are} referred to as one blue pixel group, an interval i between adjacent blue pixel groups is set to a distance between the red pixel R and the green pixel G g.

In the present embodiment, unlike the above-described embodiment, two red pixels R and two green pixels G are repeatedly arranged along a row. This is because the blue light emitting layer 370B of the two blue pixels B ₁ and B ₂ neighboring in the column direction is formed in one pattern in the above-described embodiment, and the two red pixels R ₁ , The red light emitting layer 370R of red (R ₂ ) and / or the green light emitting layer 370G of two neighboring green (G ₁ , G ₂ ) pixels are formed in a single pattern.

Some of the first blue light of the blue light-emitting layer (370B) in the above embodiment the pixel light-emitting layer of (B ₁₎ (370B ₁₎ and the blue light-emitting layer the light emitting layer of the part and a second blue pixel (B ₂₎ of the (370B) (370B ₂₎ in that same manner, a light emitting layer (370R ₂₎ of the red light-emitting luminescent layer a part of the first red pixel (R ₁₎ a (370R) (370R ₁₎ and some a second red pixel of a red emission layer (370R) (R ₂₎ and is, the light emitting layer in a part of the green emission layer (370G) a first green pixel (G ₁₎ (370G ₁₎ and the light emitting layer (370G ₂₎ of a part of the green emission layer (370G) a second green pixel (G _2).

This is because when the red light emitting layer 370R or the green light emitting layer 370G is deposited, the light emission of the neighboring first and second red pixels R ₁ and R ₂ or the neighboring first and second green pixels G 1 and G 2 Can be formed by using a shadow mask having an opening having a size corresponding to the sum of the areas.

At this time, since the emission layers 370R of the first and second red pixels R ₁ and R ₂ adjacent to each other are one pattern, they do not have an interval therebetween, and the neighboring first red pixels R ₁ and second red pixels R ₁ , gap between the pixels (R ₂₎ is substantially determined by the spacing (h) between the first red pixel a pixel electrode (191R ₁₎ and the second pixel electrode (191R ₂₎ of a red pixel (R ₂₎ a (R ₁₎ do. Likewise, the light emitting layers 370G of the first and second green pixels G ₁ and G ₂ are one pattern and do not have an interval therebetween. The neighboring first green pixel G ₁ and second green pixel G ₂₎ the distance between is substantially determined by a first distance (h) between the pixel electrode ₍₂ 191G) of a green pixel (a pixel electrode of G _1), (191G ₁₎ and a second green pixel (G _2).

Distance (h) between the time a pixel electrode (191R _1, 191R ₂₎ or pixel electrodes (191G _1, 191G ₂₎ are independent of the shadow mask used for depositing a luminescent layer (370R, 370G) by the limitation of a shadow mask It is possible to prevent the shadow effect in which the light emitting area is reduced.

14 and 15 will be described with reference to Figs. 16A to 17C together with Figs. 14 and 15. Fig.

FIGS. 16A and 16B are schematic views showing masks used for forming an organic light emitting layer in a method of manufacturing an organic light emitting display according to another embodiment of the present invention. FIGS. 17A to 17C are cross- And a method of forming an organic luminescent layer when the display device is manufactured.

If the first reference to Figure 15, forming a plurality of pixel electrodes ₍₁ 191R, 191R _2, 191G _{1, 2} 191G, 191B _1, 191B ₂₎ on an insulating substrate 110 and laminating the insulation film 361 thereon. At this time, the insulating film 361 has a plurality of openings 365 exposing the pixel electrodes _{(191R 1, 191R 2, 191G} 1, 191G 2, 191B 1, 191B 2).

Next, organic light emitting layers 370R, 370G, and 370B are formed in the openings 365, respectively.

The organic light emitting layers 370R, 370G, and 370B can be formed by a deposition method using a shadow mask.

Referring to FIGS. 16A and 16B, in the embodiment of the present invention, two masks 50 and 60 are required for depositing the organic light emitting layers 370R, 370G and 370B. The sixth mask 60 has a plurality of openings 60a having a substantially rectangular shape as shown in Fig. 16A and is used for depositing the red light emitting layer 370R and the green light emitting layer 370G, and the fifth mask 50 And has a plurality of openings 50a having a substantially rectangular shape as shown in FIG. 16B, and is used for depositing the blue light emitting layer 370B.

14 and referring to Figure 17a, the pixel electrode _{(191R 1, 191R 2, 191G} 1, 191G 2, 191B 1, 191B 2) and the insulating film 361 is formed on the sixth mask 60 on the substrate 110 in . Then it claims 6 to form a red luminescent layer (370R) is deposited on the red light-emitting material through an opening (60a), a pixel electrode (191R _1, 191R ₂₎ of the mask (60). Red light-emitting layer (370R) is formed to a size to overlap the two pixel electrodes (191R _1, 191R _2).

17B, a sixth mask 60 is moved by a predetermined distance and a green light emitting material is deposited on the pixel electrodes 191G ₁ and 191G ₂ through the opening 60a to form a green light emitting layer 370G . The green light emitting layer 370G is formed to have a size overlapping the two pixel electrodes 191G ₁ and 191G ₂ .

17C, a fifth mask 50 is disposed on the substrate 110 and a blue light emitting material 370B is formed on the pixel electrodes 191B ₁ and 191B ₂ by depositing a blue light emitting material through the openings 50a. do. The blue light emitting layer 370B is formed to have a size overlapping the two pixel electrodes 191B ₁ and 191B ₂ .

Thus, in this embodiment, not only the blue luminescent layer 370B but also the red luminescent layer 370R and the green luminescent layer 370G are formed in one pattern over two neighboring pixels. Therefore, the red pixel R and the green pixel G as well as the blue pixel B can be prevented from being reduced due to the fabrication limit of the shadow mask, so that the red pixel R, the green pixel G, (B) can secure the light emitting area and the aperture ratio.

[Example 4]

Hereinafter, an OLED display according to another embodiment of the present invention will be described with reference to FIG.

18 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention.

Referring to FIG. 18, the pixel arrangement of the OLED display according to the present embodiment will be described. As in the third embodiment, two red pixels R and green pixels G are repeatedly arranged along the first column, And blue pixels B are arranged consecutively along two rows.

However, unlike the third embodiment, two red pixels R and blue pixels B are repeatedly arranged along a row, and two green pixels G and blue pixels B are repeatedly arranged.

According to this pixel arrangement, four blue pixels B, four red pixels R, and four green pixels G are grouped into groups, and four blue pixels B ₁ , B _2, a red emission layer (370R) of B _3, B ₄₎ of the blue light-emitting layer (370B) is formed into a pattern, the four red pixels _{(R 1, R 2, R} 3, R 4) adjacent to each other And green light emitting layers 370G of four adjacent green pixels G ₁ , G ₂ , G ₃ and G ₄ are formed in one pattern.

At this time, the interval j between the red pixel group including the four red pixels R and the green pixel group including the four green pixels G, the red pixel group and the four blue pixels B The interval j between the blue pixel groups and the interval j between the green pixel group and the blue pixel group are substantially equal to each other.

In this embodiment, since four neighboring pixels are formed of one light emitting layer, they can be formed by using a shadow mask having an opening with a size corresponding to the sum of the light emitting areas of four neighboring pixels when depositing the light emitting layer. The deposition method using the shadow mask is the same as that of the above-described embodiment, and will not be described here.

  At this time, the light emitting layers of the neighboring four pixels are one pattern, so that they do not have an interval therebetween, and the interval between neighboring pixels is substantially determined by the interval (k) between the pixel electrodes. The red pixel group, the green pixel group, and the blue pixel group.

Distance (h) between the time a pixel electrode (191R _1, 191R ₂₎ or pixel electrodes (191G _1, 191G ₂₎ are independent of the shadow mask used for depositing a luminescent layer (370R, 370G) by the limitation of a shadow mask It is possible to prevent the shadow effect in which the light emitting area is reduced. Further, since the light emitting layers of the four neighboring pixels are formed in one pattern, the light emitting area can be further secured as compared with the above-described embodiment, which is advantageous.

[Example 5]

Hereinafter, an OLED display according to another embodiment of the present invention will be described with reference to FIG.

19 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention.

Referring to FIG. 19, the pixel arrangement of the OLED display according to the present embodiment will be described. As in the fourth embodiment, two red pixels R and green pixels G are repeatedly arranged along the first column, And blue pixels B are arranged consecutively along two rows.

However, unlike the fourth embodiment, two red pixels R, two blue pixels B, and two green pixels G are repeatedly arranged along a row. In this case, the aperture ratio is the same as that of Embodiment 4, but the visibility can be improved.

In the above-described embodiments, two types of pixels, for example, a red pixel R and a blue pixel B or a green pixel G and a blue pixel B are repeatedly arranged along the row direction. On the other hand, in the present embodiment, by using a structure in which three kinds of pixels, that is, red pixel (R), blue pixel (B) and green pixel (G) It is possible to prevent horizontal line spots that may occur along the row direction when displaying a specific color such as the green pixel G. [ Therefore, the pixel arrangement according to the present embodiment can improve the visibility in comparison with the above-described embodiments.

The aperture ratio improvement of the OLED display according to the present invention will be described with reference to FIG.

20 is a graph comparing the aperture ratios of the organic light emitting diode display of the stripe structure according to the embodiments of the present invention.

 Referring to FIG. 20, it can be seen that the aperture ratio of the OLED display according to the first to fifth embodiments is improved compared with the OLED display of the stripe structure.

Therefore, the organic light emitting display according to the embodiments of the present invention can prevent the shadow effect that may occur due to the limitation of the shadow mask, thereby preventing the light emitting area and the aperture ratio from being reduced even in a large- have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And falls within the scope of the invention.

1 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to an embodiment of the present invention,

2 is a cross-sectional view schematically showing a cross section of a red pixel R, a green pixel G and a blue pixel B of the organic light emitting diode display of FIG. 1,

3A and 3B are schematic views showing a mask used for forming an organic light emitting layer in a method of manufacturing an organic light emitting display according to an embodiment of the present invention,

FIGS. 4A to 4C are schematic views sequentially illustrating a method of forming an organic light emitting layer when the OLED display of FIGS. 1 and 2 is manufactured.

5 is a cross-sectional view taken along the line V-V in Fig. 4A,

6 is a plan view schematically showing the arrangement of a plurality of pixels in an organic light emitting diode display of a stripe structure,

7 is a schematic view showing a mask used for forming an organic light emitting layer in an organic light emitting display of a stripe structure,

8A to 8C are schematic views sequentially showing a method of forming an organic light emitting layer in manufacturing an organic light emitting display device having a stripe structure,

FIG. 9 is a sectional view taken along the line XI-XI in FIG. 8A,

10 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention,

11 is a cross-sectional view schematically showing a cross section of a red pixel (R), a green pixel (G), and a blue pixel (B) in the organic light emitting diode display of FIG.

12A and 12B are schematic views showing a mask used for forming an organic light emitting layer in a method of manufacturing an organic light emitting display according to another embodiment of the present invention,

FIGS. 13A to 13C are schematic views sequentially showing a method of forming an organic light emitting layer in manufacturing the OLED display of FIGS. 10 and 11,

14 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention,

15 is a cross-sectional view schematically showing a cross section of a red pixel R, a green pixel G and a blue pixel B of the organic light emitting diode display of FIG. 14,

16A and 16B are schematic views showing a mask used for forming an organic light emitting layer in a method of manufacturing an organic light emitting display according to another embodiment of the present invention,

FIGS. 17A to 17C are schematic views sequentially showing a method of forming an organic light emitting layer in manufacturing the OLED display of FIGS. 14 and 15. FIG.

18 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention,

19 is a plan view schematically showing the arrangement of a plurality of pixels in an OLED display according to another embodiment of the present invention,

20 is a graph comparing the aperture ratios of the organic light emitting diode display of the stripe structure according to the embodiments of the present invention.

Claims (26)

A plurality of first pixels formed on the first pixel electrode and the first pixel electrode and including a light emitting layer for displaying a first color, A second pixel electrode and a second pixel formed on the second pixel electrode and including a light emitting layer for displaying a second color, A third pixel electrode, and a plurality of third pixels including a light emitting layer formed on the third pixel electrode and displaying a third color, Lt; / RTI > Wherein the plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, Wherein the plurality of third pixels are successively arranged along a second column, The light emitting layer of the third pixel overlaps with at least two neighboring third pixel electrodes, Wherein an interval between the light emitting layers of the third pixel is greater than an interval between the first pixel and the second pixel. The method of claim 1, Wherein the third pixel has a larger area than the first pixel and the second pixel. 3. The method of claim 2, Wherein the first pixel and the second pixel are alternately arranged one after another along the first column. 3. The method of claim 2, Wherein the first pixel and the second pixel are alternately arranged in two along the first column. 5. The method of claim 4, Wherein the light emitting layer of the first pixel overlaps at least two neighboring first pixel electrodes. The method of claim 5, Wherein the light emitting layer of the second pixel overlaps with at least two neighboring second pixel electrodes. 3. The method of claim 2, Wherein the first color is red, the second color is green, and the third color is blue. A plurality of first pixels including a light emitting layer for displaying a first color, A plurality of second pixels including a light emitting layer for displaying a second color, and A plurality of third pixels including a light emitting layer for displaying a third color, Lt; / RTI > Wherein the plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, Wherein the plurality of third pixels are successively arranged along a second column, Emitting layers of at least two third pixels are connected to each other, Wherein an interval between the light emitting layers of the third pixel is greater than an interval between the first pixel and the second pixel. 9. The method of claim 8, Wherein the first color is red, the second color is green, and the third color is blue. The method of claim 9, And the light emitting layers of the at least two first pixels are connected to each other. 11. The method of claim 10, And the light emitting layers of the at least two second pixels are connected to each other. The method of claim 9, Wherein the third pixel has a larger area than the first pixel and the second pixel. A plurality of red pixel groups arranged in a 2x2 matrix and including four red pixels sharing one red light emitting layer, A plurality of green pixel groups arranged in a 2x2 matrix and including four green pixels sharing one green light emitting layer, and A plurality of blue pixel groups arranged in a 2x2 matrix and including four blue pixels sharing one blue light emitting layer / RTI > Wherein the red pixel group and the green pixel group are alternately arranged to form a first column, Wherein the blue pixel group is continuously arranged to form a second row, Wherein the first column and the second column are alternately arranged Organic light emitting display. The method of claim 13, And the pixel groups of two first columns located on both sides of the second column are the same. The method of claim 13, Wherein a position of the red pixel group and a position of the green pixel group are shifted from each other in two first columns located on both sides of the second row. delete delete delete delete delete Forming a plurality of pixel electrodes on a substrate, Forming a plurality of first, second and third light emitting layers adjacent to each other on the pixel electrode to emit light of first, second and third colors, respectively, and Forming a common electrode on the first, second and third light emitting layers, Lt; / RTI > The step of forming the first, second and third light emitting layers Forming the plurality of first light emitting layers using a first mask having a plurality of first openings, Forming the plurality of second light emitting layers at neighboring positions of the first light emitting layer using the first mask, and Forming a plurality of third light emitting layers at neighboring positions of the first light emitting layer and the second light emitting layer using a second mask having a plurality of second openings larger in area than the first openings Lt; / RTI > Wherein the third light emitting layer overlaps at least two adjacent pixel electrodes, And the distance between the second openings is larger than the distance between the first openings. delete 22. The method of claim 21, Wherein at least one of the first light emitting layer and the second light emitting layer overlaps at least two neighboring pixel electrodes. delete delete delete

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