KR20090049515A - Organic light emitting diode display and method for manufacturing the same - Google Patents

Abstract

According to an embodiment of the present invention, a plurality of first pixels, a second pixel electrode, and a second pixel electrode are formed on a first pixel electrode and the first pixel electrode, and include a light emitting layer displaying a first color. And a plurality of second pixels including a light emitting layer for displaying a light emitting layer, 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. A first pixel and the plurality of second pixels are alternately arranged along a first column, the plurality of third pixels are continuously arranged along a second column, and the light emitting layer of the third pixel is adjacent to at least An organic light emitting diode display overlapping two third pixel electrodes, and a method of manufacturing the same.

OLED display, light emitting layer, shadow mask, shadow effect, aperture ratio

Description

Organic light-emitting display device and manufacturing method therefor {ORGANIC LIGHT EMITTING DIODE DISPLAY AND METHOD FOR MANUFACTURING THE SAME}

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

Lightweight and thinner monitors or televisions are required, and cathode ray tubes (CRTs) are being replaced by liquid crystal displays (LCDs) according to such demands.

However, the liquid crystal display device requires not only a separate backlight as a light emitting device, but also has limitations in response speed and viewing angle.

Recently, as a display device capable of overcoming such a limitation, an organic light emitting diode display (OLED display) has attracted attention.

The organic light emitting diode display includes two electrodes and a light emitting layer interposed therebetween, and electrons injected from one electrode and holes injected from another electrode are combined in the light emitting layer to form excitons. The excitons emit light while releasing energy.

Each of the plurality of light emitting layers displaying red, green, and blue colors may express full color, and in this case, the plurality of light emitting layers may have a stripe structure in which light emitting layers displaying the same color are arranged in a line.

 The light emitting layer of the stripe structure may be formed using a shadow mask. In this case, the shadow mask has a plurality of openings having substantially the same shape and size as the light emitting layer to be formed, and a plurality of light emitting layers arranged in a line may be formed at once by depositing an organic material through the openings.

In this case, however, the gap between the openings arranged in a line and the openings is narrow so that the edge portion of the opening of the shadow mask cannot be manufactured in detail. As a result, when the organic material is deposited through the opening, a shadow effect may occur at a portion of the organic material that is not deposited precisely, and in this case, the area of the light emitting layer that is actually deposited is reduced, resulting in a light emitting area. Can be reduced and the aperture ratio can drop.

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

An organic light emitting diode display according to an exemplary embodiment of the present invention includes a plurality of first pixels, second pixel electrodes, and the first pixel electrode and a light emitting layer formed on the first pixel electrode and displaying a first color. A plurality of second pixels including a light emitting layer formed on two pixel electrodes and including a second color; and a plurality of third pixels and a light emitting layer formed on the third pixel electrode and displaying a third color; A third pixel, 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 continuously arranged along a second column, The emission layer of the third pixel overlaps with 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 one by one along the first column.

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

The emission layer of the first pixel may overlap at least two neighboring first pixel electrodes.

The emission 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.

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

Pixel group arrangements of two first columns positioned at both sides of the second column may be identical.

The position of the red pixel group and the position of the green pixel group may be inverted in two first columns positioned at both sides of the second column.

The organic light emitting diode display according to another exemplary embodiment of the present invention includes a plurality of first, second and third pixels displaying different colors, and the plurality of first pixels and the plurality of second pixels Alternately arranged along a first column, and the plurality of third pixels are continuously arranged along a second column, and an interval between the third pixels is an interval between the first pixel and the second pixel. Can be greater than

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

The first, second and third pixels may not include portions that are continuously arranged along a row or a column, respectively.

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 diode display according to an exemplary embodiment of the present invention includes forming a plurality of pixel electrodes on a substrate, and a plurality of first light emitting first, second, and third colors of light on the pixel electrodes, respectively. Forming second and third light emitting layers adjacent to each other, and forming a common electrode on the first, second and third light emitting layers, and forming the first, second and third light emitting layers. Forming a plurality of first light emitting layers using a first mask having a plurality of first openings, and 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 adjacent positions of the first light emitting layer and the second light emitting layer by using a second mask having a plurality of second openings having a different size from the first opening.It should.

The third emission layer may overlap at least two neighboring pixel electrodes.

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

The second opening may have a larger area than the first opening.

According to another exemplary embodiment of the present invention, a method of manufacturing an organic light emitting display device includes forming a plurality of pixel electrodes on a substrate, forming a plurality of light emitting layers on the pixel electrodes, and forming a common electrode on the light emitting layer. The forming of the light emitting layer may include 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, and wherein the first light emitting layer and the second light emitting layer are formed. And at least one of the third emission layers may overlap 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 opening. Can be formed.

The shadow effect may be prevented due to the limitation of the shadow mask to prevent the light emitting area and the aperture ratio from being reduced even in a large area organic light emitting display device.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a portion of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "right over" but also when there is another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Example 1

Next, an organic light emitting diode display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIG. 2 is a II-II'-II ''-II 'of the organic light emitting diode display of FIG. 1. Referring to FIG. 1, an organic light emitting diode display according to an exemplary embodiment of the present invention includes red pixels R for displaying red, green pixels G for displaying green, and blue. The blue pixel B to display is arrange | positioned. The red pixel R, the green pixel G, and the blue pixel B are basic pixels for representing full colors, and the three pixels are repeated in rows and columns in a group.

Specifically, referring to the arrangement of the red pixels R, the green pixels G, and the blue pixels B, the plurality of red pixels R and the plurality of green pixels G are alternately along the first column. The plurality of blue pixels B are arranged continuously along the second column.

In addition, the red pixels R and the blue pixels B are alternately arranged along a row, and the green pixels G and the blue pixels B are alternately arranged along the row.

According to this arrangement, there is no portion in which the red pixels R, the green pixels G, and the blue pixels B are continuously arranged side by side in the column or row direction.

In this case, an interval b between neighboring blue pixels B is greater than an interval a between the red pixels R and the green pixels G. In addition, the spacing a between the red pixel R and the green pixel G is substantially equal to the spacing between the red pixel R and the blue pixel B or between the green pixel G and the blue pixel B. Same as

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. In this case, when the left and right are separated from each other based on one group including the red pixel R, the green pixel G, and the blue pixel B, the red pixel R and the green pixel G are positioned on the left side and the blue pixel is positioned on the left side. The area ratio can be matched by having (B) located in the post. However, the arrangement of the pixels may be variously modified.

As such, the blue pixel B is formed larger than the red pixel R and the green pixel G, thereby eliminating the limitation that the blue light emitting layer has a lower luminous efficiency and lifetime than the red and green light emitting layers depending on the light emitting material. The luminance of the pixels R, G, and B can be balanced.

Referring to FIG. 2, an organic light emitting display device having a pixel arrangement according to an exemplary embodiment of the present invention includes pixel electrodes 191R, 191G, and 191B and organic light emitting layers 370R, 370G, and 370B formed on an insulating substrate 110. ) And the common electrode 270. The pixel electrodes 191R, 191G, and 191B, the organic emission layers 370R, 370G, and 370B, and the common electrode 270 form an organic light emitting diode (OLED). In addition, an insulating film 361 is provided to insulate the pixel electrodes 191R, 191G, and 191B from the common electrode 270. Although not illustrated, a plurality of signal lines, gate lines, and the like include gate lines, data lines, and driving voltage lines. The display device may further include a switching transistor connected to a data line, a driving voltage line, a switching transistor, and a driving transistor connected to the pixel electrodes 191R, 191G, and 191B.

Next, a method of manufacturing the OLED display of FIGS. 1 and 2 will be described with reference to FIGS. 3A through 5 along with FIGS. 1 and 2.

3A and 3B are schematic views illustrating a mask used to form an organic light emitting layer in a method of manufacturing an organic light emitting display device according to an embodiment of the present invention, and FIGS. 4A to 4C are views of the organic light emitting display of FIGS. 1 and 2. FIG. 5 is a schematic view sequentially showing a method of forming an organic light emitting layer when manufacturing a device, and FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4A.

First, referring to FIG. 2, a plurality of pixel electrodes 191R, 191G, and 191B are formed on the insulating substrate 110, and an insulating film 361 is stacked thereon. In this case, the insulating layer 361 has a plurality of openings 365 exposing the pixel electrodes 191R, 191G, and 191B.

Next, organic light emitting layers 370R, 370G, and 370B are formed in each opening 365.

The organic light emitting layers 370R, 370G, and 370B may 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 required to deposit the organic light emitting layers 370R, 370G, and 370B are provided. 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 and larger than the opening 10a as shown in FIG. 3B. It has a plurality of rectangular openings 20a.

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

Next, referring to FIG. 4B, the first mask 10 is disposed by moving a predetermined distance, and a green light emitting layer 370G is formed on the pixel electrode 191G by depositing a green light emitting material through the opening 10a.

Subsequently, referring to FIG. 4C, the blue mask 370B is formed on the pixel electrode 191B by disposing a second mask 20 on the substrate 110 and depositing a blue light emitting material through the opening 20a.

As described above, in the exemplary embodiment of the present invention, the red light emitting layer 370R and the green light emitting layer 370G are formed using the first mask 10, and the blue light emitting layer 370B is formed using the second mask 20.

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

In the exemplary embodiment of the present invention, the organic light emitting layer may be formed by using a mask having a sufficient gap between the openings by forming the pixel arrangement. In the case of using a mask having sufficient gap between the openings, the edges of the openings can be manufactured finely, and thus, when the organic material is deposited through the openings, the organic materials can be precisely deposited up to the part which contacts the edges of the openings. In this case, since the organic light emitting layer having substantially the same size as the opening of the mask can be formed, the light emitting area and the opening ratio can be secured.

Such an effect according to an exemplary embodiment of the present invention can be described in comparison with an organic light emitting display device having a stripe structure.

An organic light emitting diode display having a stripe structure and a method of manufacturing the same will be described with reference to FIGS. 6 to 9.

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

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

A method of manufacturing the organic light emitting display device having the stripe structure will be briefly described with reference to FIGS. 7 to 9. The same parts as in the above-described embodiment are omitted.

Referring to FIG. 7, one mask may be used when the organic light emitting layer is deposited in the stripe-type organic light emitting diode display. That is, since the shapes and sizes of the red, green, and blue light emitting layers 370R, 370G, and 370B are the same, all of them may be deposited using the same mask 30. In this case, the mask 30 has a plurality of openings 30a having a substantially rectangular shape, and the plurality of openings 30a are narrower than the openings 10a and 20a of the masks 10 and 20 according to the embodiment of the present invention. Are arranged in columns.

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

Next, referring to FIG. 8B, the third mask 30 is disposed by moving a predetermined distance, and a green light emitting layer 370G is formed on the pixel electrode 191G by depositing a green light emitting material through the opening 30a.

Next, referring to FIG. 8C, the blue light emitting layer 370B is formed on the pixel electrode 191B by disposing the third mask 30 by moving a predetermined distance and depositing a blue light emitting material through the opening 30a.

As described above, in the organic light emitting diode display having a striped structure, the red, green, and blue light emitting layers 370R, 370G, and 370B may be formed by moving one mask 30 three times. At this time, the gap between the opening 30a and the opening 30a arranged in the same row in the mask 30 is narrow, so that the edge portion of the opening cannot be manufactured in detail during the mask fabrication.

Referring to FIG. 9, when the gap between the opening 30a and the opening 30a is narrow, the mask should be etched on both sides of the mask during fabrication to form the opening. In this case, the edge portion of the opening cannot be formed finely, and it is bumpy. It may be formed into a cross section of one shape. In this case, when the organic material is deposited through the opening 30a, a shadow effect in which the organic material is not deposited occurs in the portions 15a and 15b that contact the edges of the opening, thereby reducing the area where the organic material is deposited. Accordingly, the organic light emitting layer actually formed is formed with a smaller area than the size of the opening, so that the emission area and the opening ratio may be lowered.

5 and 9, since the deposition area of the organic light emitting layer formed according to the exemplary embodiment of the present invention is larger than the deposition area of the organic light emitting layer formed in the organic light emitting diode display having a stripe structure, the emission area and the aperture ratio may be improved. It can be seen that.

Example 2

Hereinafter, an organic light emitting diode display according to another exemplary embodiment will be described in detail with reference to FIGS. 10 and 11.

FIG. 10 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment. FIG. 11 is a red pixel R and a green pixel G of the organic light emitting diode display of FIG. 10. And a cross-sectional view schematically showing a cross section of the blue pixel B. FIG.

Referring to FIG. 10, the arrangement of pixels in the organic light emitting diode display according to the present exemplary embodiment, like the above-described exemplary embodiment, the plurality of red pixels R and the plurality of green pixels G are alternately along the first column. The plurality of blue pixels B are arranged continuously along the second column.

In addition, the red pixels R and the blue pixels B are alternately arranged along a row, and the green pixels G and the blue pixels B are alternately arranged along the row.

At this time, the interval 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. Substantially the same, when two neighboring blue pixels B ₁ and B _{2 are} referred to as one blue pixel group, a distance f between the neighboring blue pixel groups is equal to the red pixel R and the green pixel G. Greater than the interval d between.

Unlike the above-described embodiment, the light emitting layer 370B of two neighboring blue pixels B ₁ and B ₂ is formed in one pattern. That is, the emission layer 370B of the blue pixel B overlaps with two neighboring pixel electrodes 191B ₁ and 191B ₂ .

10 and 11, the red light emitting layer 370R is formed on the pixel electrode 191R in the red pixel R, and the 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 has two light emitting layers 370B of two blue pixels B ₁ and B ₂ adjacent to each other, that is, the first blue pixel B ₁ and the second blue pixel B ₂ . It is formed in a 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). When the blue light emitting layer 370B is formed, it may be formed by depositing using a shadow mask having an opening having 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, the neighboring first and second blue pixel first blue pixel (B ₁₎ to the light emitting layer (370B) of (B _1, B ₂₎ being one of a pattern and continued without a gap therebetween, adjacent to the second to 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 Is determined. In this case _, the interval e between the pixel electrodes 191B _{1 and} 191B ₂ is independent of the shadow mask used to deposit the light emitting layer 370B, and thus the shadow effect of reducing the emission area due to the limitation of the shadow mask may be prevented.

Next, a method of manufacturing the OLED display of FIGS. 10 and 11 will be described with reference to FIGS. 12A through 13C along with FIGS. 10 and 11.

12A and 12B are schematic views illustrating a mask used to form an organic light emitting layer in a method of manufacturing an organic light emitting diode display according to another exemplary embodiment, and FIGS. 13A to 13C illustrate the organic light emitting display of FIGS. 10 and 11. It is a schematic diagram showing in turn a method of forming an organic light emitting layer when manufacturing a device.

First, referring to FIG. 11, a plurality of pixel electrodes 191R, 191G, 191B ₁ , and 191B ₂ are formed on the insulating substrate 110, and an insulating film 361 is stacked thereon. In this case, the insulating layer 361 has a plurality of openings 365 exposing each pixel electrode 191R, 191G, 191B ₁ , and 191B ₂ .

Next, organic light emitting layers 370R, 370G, and 370B are formed in each opening 365.

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

12A and 12B, in the exemplary embodiment of the present invention, two masks 40 and 50 required to deposit the organic light emitting layers 370R, 370G, and 370B are provided. The fourth mask 40 has a plurality of substantially square openings 40a as shown in FIG. 12A, which is the first used to deposit the red light emitting layer 370R and the green light emitting layer 370G in the above-described embodiment. It may be the same as the mask 10. As shown in FIG. 12B, the fifth mask 50 has a plurality of openings 50a having a larger area than the opening 40a of the fourth mask 40 and having a substantially rectangular shape.

Referring to FIG. 13A, a fourth mask 40 is disposed on the substrate 110 on which the pixel electrodes 191R, 191G, 191B ₁ , and 191B ₂ and the insulating layer 361 are formed. Subsequently, the red light emitting layer 370R is formed on the pixel electrode 191R by depositing a red light emitting material through the opening 40a of the fourth mask 40 in the same manner as in the above-described embodiment.

Next, referring to FIG. 13B, the fourth mask 40 is disposed by moving a predetermined distance, and a green light emitting layer 370G is formed on the pixel electrode 191G by depositing a green light emitting material through the opening 40a.

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

As described above, in the present exemplary 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 form} the fifth mask 50. Use to form one pattern.

In the exemplary embodiment of the present invention, the organic light emitting layer may be formed using a mask having a sufficient gap between the openings by forming the organic light emitting layer by the above-described method. In the case of using a mask having sufficient gap between the openings, the edges of the openings can be manufactured finely, and thus, when the organic material is deposited through the openings, the organic materials can be precisely deposited up to the part which contacts the edges of the openings.

In particular, in the present exemplary embodiment, when the light emitting layers are formed separately by forming the light emitting layers of two neighboring blue pixels in one pattern, it is possible to prevent a shadow effect that may occur due to the limitation of the above-described shadow mask. Therefore, it is possible to prevent the light emitting area and the aperture ratio from decreasing due to the interval between the light emitting layers.

Example 3

Hereinafter, an organic light emitting diode display according to another exemplary embodiment will be described in detail with reference to FIGS. 14 and 15.

FIG. 14 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment. FIG. 15 is a red pixel R and a green pixel G of the organic light emitting diode display of FIG. 14. And a cross-sectional view of the blue pixel B schematically.

Referring to FIG. 14, the pixel arrangement of the organic light emitting diode display according to the present exemplary embodiment is the same as the above-described exemplary embodiment. The red pixels R and the blue pixels B are alternately arranged along a row, and the green pixels G are alternately arranged. ) And the blue pixels B are also arranged alternately along the row.

At this time, the interval g between the red pixel R and the green pixel G, the interval g between the red pixel R and the blue pixel B, and between the green pixel G and the blue pixel B The interval g of is substantially the same. In addition, when two neighboring blue pixels B ₁ and B _{2 are} referred to as one blue pixel group, an interval i between neighboring blue pixel groups is defined as a gap between the red pixel R and the green pixel G ( greater than g).

Unlike the embodiment described above, the red pixel R and the green pixel G are repeatedly arranged two by one along the column. This is just like the blue light-emitting layer (370B) of the two blue pixel (B _1, B ₂₎ neighboring in the column direction in the above embodiment is formed in a pattern, two red pixels neighboring in a column direction (R _1, The red light emitting layer 370R of R ₂ and / or the green light emitting layer 370G of two neighboring green pixels G ₁ and G ₂ are also formed in one 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 of neighboring first and second red pixels R ₁ and R ₂ or neighboring first and second green pixels G1 and G2 is emitted. It can be formed by using a shadow mask having an opening of a size corresponding to the sum of the areas.

At this time, the neighboring first and second red pixels (R _1, R ₂₎ of the light-emitting layer (370R) being one of a pattern and continued without gaps therebetween, adjacent a first red pixel (R ₁₎ and second red to which 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. Similarly, since the light emitting layers 370G of the first and second green pixels G ₁ and G ₂ are one pattern, the light emitting layers 370G are connected without a gap therebetween, and adjacent neighboring first green pixels G ₁ and second green pixels 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 of reducing the light emitting area.

Next, a method of manufacturing the OLED display of FIGS. 14 and 15 will be described with reference to FIGS. 16A through 17C along with FIGS. 14 and 15.

16A and 16B are schematic views illustrating a mask used to form an organic light emitting layer in the method of manufacturing an organic light emitting diode display according to another exemplary embodiment, and FIGS. 17A to 17C illustrate organic light emitting diodes of FIGS. 14 and 15. When manufacturing a display device, a schematic diagram showing a method of forming an organic light emitting layer is provided.

If the first reference to Figure 15, forming a plurality of pixel electrodes _{(191R 1, 191R 2, 191G} 1, 191G 2, 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 each opening 365.

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

16A and 16B, in the embodiment of the present invention, two masks 50 and 60 are required to deposit 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 to deposit the red light emitting layer 370R and the green light emitting layer 370G, and the fifth mask 50 may be used. As shown in FIG. 16B, a plurality of openings 50a having a substantially rectangular shape are used to deposit 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 Place it. Subsequently, a red light emitting material is deposited through the opening 60a of the sixth mask 60 to form a red light emitting layer 370R on the pixel electrodes 191R ₁ and 191R ₂ . The red light emitting layer 370R is formed to overlap the two pixel electrodes 191R ₁ and 191R ₂ .

Next, referring to FIG. 17B, the sixth mask 60 is disposed by moving a predetermined distance, and a green light emitting layer 370G is formed on the pixel electrodes 191G ₁ and 191G ₂ by depositing a green light emitting material through the opening 60a. . The green emission 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 is deposited through the opening 50a to form a blue light emitting layer 370B on the pixel electrodes 191B ₁ and 191B ₂ . do. The blue light emitting layer 370B is formed to have a size overlapping the two pixel electrodes 191B ₁ and 191B ₂ .

As described above, in the present embodiment, not only the blue light emitting layer 370B but also the red light emitting layer 370R and the green light emitting layer 370G are formed in one pattern across two neighboring pixels. Therefore, not only the blue pixel B but also the red pixel R and the green pixel G can prevent the emission area from being reduced due to the manufacturing limitation of the shadow mask, so that the red pixel R, the green pixel G, and the blue pixel can be prevented. In both (B), the light emitting area and the aperture ratio can be secured.

Example 4

Hereinafter, an organic light emitting diode display according to another exemplary embodiment will be described with reference to FIG. 18.

18 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present invention.

Referring to FIG. 18, the pixel arrangement of the organic light emitting diode display according to the present exemplary embodiment is the same as that of the third exemplary embodiment, in which red pixels R and green pixels G are repeatedly arranged along the first column. Blue pixels B are continuously arranged along two columns.

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

According to the pixel arrangement, four blue pixels B, four red pixels R, and four green pixels G form a group, and thus four blue pixels B ₁ neighboring each other. , The blue light emitting layer 370B of B ₂ , B ₃ , and B ₄ is formed in one pattern, and the red light emitting layer 370R of four red pixels R ₁ , R ₂ , R ₃ , and R ₄ which are adjacent to each other. The light emitting layer 370G of four green pixels G ₁ , G ₂ , G ₃ , and G ₄ adjacent to each other is formed in one pattern, and is formed in one pattern.

In this case, an interval j between a red pixel group including four red pixels R and a green pixel group including four green pixels G, a red pixel group, and four blue pixels B are included. An interval j between the blue pixel group and an interval j between the green pixel group and the blue pixel group are substantially the same.

In the present exemplary embodiment, four neighboring pixels are formed of one light emitting layer, and thus, when the light emitting layer is deposited, it may be formed by using a shadow mask having an opening having a size corresponding to the sum of the light emitting areas of the four neighboring pixels. Since the deposition method using the shadow mask is the same as in the above-described embodiment, it is omitted here.

  In this case, since the light emitting layers of the four neighboring pixels are one pattern, they are continued without a gap therebetween, and the interval between neighboring pixels is substantially determined by the distance k between pixel electrodes. The red pixel group, the green pixel group, and the blue pixel group are all applicable.

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 of reducing the light emitting area. In addition, since the light emitting layers of four neighboring pixels are formed in one pattern, the light emitting area can be more secured than in the above-described embodiment.

Example 5

Hereinafter, an organic light emitting diode display according to another exemplary embodiment will be described with reference to FIG. 19.

19 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present invention.

Referring to FIG. 19, the pixel arrangement of the organic light emitting diode display according to the present exemplary embodiment is the same as that of the fourth exemplary embodiment, in which red pixels R and green pixels G are repeatedly arranged along the first column. Blue pixels B are continuously arranged along two columns.

However, unlike Embodiment 4, 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 the fourth embodiment, but the visibility can be improved.

The above-described embodiments have a structure in which two kinds of pixels, for example, the red pixel R and the blue pixel B, or the green pixel G and the blue pixel B are repeatedly arranged along the row direction. In contrast, the present embodiment uses a structure in which three kinds of pixels, ie, the red pixel R, the blue pixel B, and the green pixel G, are repeatedly arranged along the direction, and thus, the red pixel R or the like. When displaying a specific color, such as the green pixel G, it is possible to prevent horizontal streaks that may occur along the row direction. Therefore, the pixel arrangement according to the present embodiment may be improved in visibility compared to the above-described embodiments.

An improvement in aperture ratio of the organic light emitting diode display according to the exemplary embodiments described above will be described with reference to FIG. 20.

20 is a graph comparing aperture ratios of an organic light emitting diode display and an organic light emitting diode display having a stripe structure according to example embodiments.

 Referring to FIG. 20, it can be seen that the aperture ratio of the organic light emitting diode display according to the first to fifth embodiments is improved compared to the organic light emitting diode display having the stripe structure.

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

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

1 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to an exemplary embodiment of the present disclosure.

FIG. 2 is a cross-sectional view schematically illustrating a cross section of a red pixel R, a green pixel G, and a blue pixel B of the OLED display of FIG. 1.

3A and 3B are schematic views illustrating a mask used to form an organic light emitting layer in a method of manufacturing an organic light emitting diode display according to an exemplary embodiment of the present invention.

4A through 4C are schematic views sequentially illustrating a method of forming an organic emission 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 illustrating an arrangement of a plurality of pixels in an organic light emitting diode display having a striped structure;

7 is a schematic diagram illustrating a mask used to form an organic light emitting layer in an organic light emitting diode display having a striped structure.

8A to 8C are schematic views sequentially illustrating a method of forming an organic light emitting layer when manufacturing an organic light emitting display device having a striped structure.

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

FIG. 10 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present disclosure; FIG.

FIG. 11 is a cross-sectional view schematically illustrating a cross section of a red pixel R, a green pixel G, and a blue pixel B of the OLED display of FIG. 10.

12A and 12B are schematic views illustrating a mask used to form an organic light emitting layer in a method of manufacturing an organic light emitting diode display according to another exemplary embodiment of the present invention.

13A to 13C are schematic views sequentially illustrating a method of forming an organic emission layer when the organic light emitting diode display of FIGS. 10 and 11 is manufactured.

14 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present disclosure.

FIG. 15 is a cross-sectional view schematically illustrating 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 illustrating a mask used to form an organic light emitting layer in a method of manufacturing an organic light emitting diode display according to another exemplary embodiment of the present invention.

17A to 17C are schematic views sequentially illustrating a method of forming an organic light emitting layer when manufacturing the organic light emitting diode display of FIGS. 14 and 15.

18 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present invention.

19 is a plan view schematically illustrating an arrangement of a plurality of pixels in an organic light emitting diode display according to another exemplary embodiment of the present disclosure.

20 is a graph comparing aperture ratios of an organic light emitting diode display and an organic light emitting diode display having a stripe structure according to example embodiments.

Claims (26)

A plurality of first pixels formed on a first pixel electrode and on the first pixel electrode and including a light emitting layer displaying a first color; A plurality of second pixels including a second pixel electrode and a light emitting layer formed on the second pixel electrode and displaying a second 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; Including, The plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, The plurality of third pixels are continuously arranged along a second column, The light emitting layer of the third pixel overlaps with at least two neighboring third pixel electrodes. In claim 1, The third pixel has an area larger than that of the first pixel and the second pixel. In claim 2, And the first and second pixels are alternately arranged one by one along the first column. In claim 2, And the first pixel and the second pixel are alternately arranged along the first column. In claim 4, The light emitting layer of the first pixel overlaps with at least two neighboring first pixel electrodes. In claim 5, The light emitting layer of the second pixel overlaps with at least two neighboring second pixel electrodes. In claim 2, 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 displaying a first color, A plurality of second pixels including a light emitting layer displaying a second color, and A plurality of third pixels including a light emitting layer displaying a third color Including, The plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, The plurality of third pixels are continuously arranged along a second column, The organic light emitting diode display of which at least two light emitting layers of the third pixel are connected to each other. In claim 8, The first color is red, the second color is green, and the third color is blue. In claim 9, The light emitting layers of the at least two first pixels are connected to each other. In claim 10, The light emitting layer of the at least two second pixels is connected to each other. In claim 9, The third pixel has an area larger than that of the first pixel and the second pixel. A plurality of groups of red pixels 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. Including, The red pixel group and the green pixel group are alternately arranged to form a first column, The blue pixel group is continuously arranged to form a second column, The first column and the second column are alternately arranged OLED display. In claim 13, An organic light emitting display device having the same arrangement of pixel groups in two first columns positioned at both sides of the second column. In claim 13, And a position of the red pixel group and a position of the green pixel group are reversed in two first columns positioned at both sides of the second column. A plurality of first, second and third pixels displaying different colors; The plurality of first pixels and the plurality of second pixels are alternately arranged along a first column, The plurality of third pixels are continuously arranged along a second column, The interval between the third pixels is greater than the interval between the first pixel and the second pixel. The method of claim 16, And the first pixel and the third pixel or the second pixel and the third pixel are alternately arranged along a row. The method of claim 17, The first, second, and third pixels of the organic light emitting diode display do not include portions arranged in succession along rows or columns. The method of claim 18, And an interval between the first pixel and the third pixel is 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 method of claim 16, And the first, second and third pixels display red, green, and blue colors, respectively. Forming a plurality of pixel electrodes on the substrate, Forming a plurality of first, second, and third light emitting layers adjacent to 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 Including, Forming the first, second and third light emitting layers Forming the plurality of first emission layers using a first mask having a plurality of first openings, Forming the plurality of second light emitting layers at a position adjacent to the first light emitting layer using the first mask, and Forming the plurality of third light emitting layers at adjacent positions of the first light emitting layer and the second light emitting layer by using a second mask having a plurality of second openings different in size from the first opening. Method of manufacturing an organic light emitting display device comprising a. The method of claim 21, The third light emitting layer overlaps with at least two neighboring pixel electrodes. The method of claim 22, And at least one of the first light emitting layer and the second light emitting layer overlaps at least two neighboring pixel electrodes. The method of claim 21, The second opening has a larger area than the first opening. Forming a plurality of pixel electrodes on the substrate, Forming a plurality of light emitting layers on the pixel electrode, and Forming a common electrode on the light emitting layer Including, Forming the light emitting layer is Sequentially forming a plurality of first light emitting layers, a plurality of second light emitting layers, and a plurality of third light emitting layers emitting different colors; At least one of the first emission layer, the second emission layer, and the third emission layer may be formed to overlap at least two pixel electrodes. A method of manufacturing an organic light emitting display device. The method of claim 25, The first light emitting layer and the second light emitting layer are formed using a first mask having a plurality of first openings, The third light emitting layer is formed using a second mask having a plurality of second openings larger than the first opening. A method of manufacturing an organic light emitting display device.

Images