KR101780009B1 - Organic light emitting display device - Google Patents

Organic light emitting display device Download PDF

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KR101780009B1
KR101780009B1 KR1020150107162A KR20150107162A KR101780009B1 KR 101780009 B1 KR101780009 B1 KR 101780009B1 KR 1020150107162 A KR1020150107162 A KR 1020150107162A KR 20150107162 A KR20150107162 A KR 20150107162A KR 101780009 B1 KR101780009 B1 KR 101780009B1
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electrode
light emitting
bank
organic light
pixel region
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KR1020150107162A
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Korean (ko)
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KR20170014206A (en
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김강현
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엘지디스플레이 주식회사
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    • H01L27/326—
    • H01L27/3246—
    • H01L27/3248—
    • H01L27/3258—
    • H01L2227/32—

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Abstract

In order to provide an organic electroluminescent imaging apparatus capable of improving the display quality by forming the thickness of the organic light emitting layer to a target thickness, the present invention provides a method of manufacturing an organic electroluminescent imaging apparatus including a substrate including a pixel region, An auxiliary pattern disposed over the first electrode in the shape of a solid line or a broken line along the center of the pixel region in the major axis direction or the minor axis direction of the pixel region; And a second bank disposed above the first bank to expose the edge of the first bank.

Description

[0001] The present invention relates to an organic light emitting display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic electroluminescent display device, and more particularly to an organic electroluminescent display device capable of improving display quality by forming a thickness of an organic light emitting layer to a target thickness.

[0002] Currently, flat panel display devices such as plasma display panels (PDP), liquid crystal display devices (LCD), and organic light emitting display devices (OLED) have been widely studied and used .

Of the flat panel display devices as described above, the organic light emitting display device is a self-luminous device, and since it does not require a backlight used in a liquid crystal display device, it can be lightweight and thin.

In addition, it has superior viewing angle and contrast ratio compared with liquid crystal display devices, is advantageous in terms of power consumption, can be driven by DC low voltage, has a quick response speed, is resistant to external impacts due to its solid internal components, It has advantages.

Particularly, since the manufacturing process is simple, it is advantageous in that the production cost can be saved more than the conventional liquid crystal display device.

FIG. 1 is a plan view showing a conventional organic light emitting display device, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, illustrating a process of depositing an organic light emitting layer in a pixel region by a solution process.

More specifically, FIG. 2 (a) is a view showing a dropping process during a solution process, and FIG. 2 (b) is a view showing a state in which an organic light emitting layer is laminated after a solution process.

As shown in the figure, a conventional organic light emitting display device includes a plurality of pixel regions P and banks 7 which are arranged at boundaries of the pixel regions P and which partition the pixel regions P, respectively.

Specifically, the protective layer 3 is disposed on the substrate 11, and the first electrode 5 is disposed in the pixel region P above the protective layer 3.

The bank 7 covers the edge of the first electrode 5 and is disposed at the boundary of the pixel region P above the protective layer 3. [

The organic light emitting layer 10 is disposed on the first electrode 5 of the pixel region P and is formed by a soluble process such as an inkjet printing method or a nozzle printing method, do.

Hereinafter, a process of laminating the organic light emitting layer 10 by a soluble process will be described.

First, as shown in FIG. 2A, the organic light emitting material solution 9 is dropped onto the first electrode 5 of the pixel region P. At this time, The uniformity of the organic light emitting layer 10 can be improved by spreading the organic light emitting material solution 9 uniformly throughout the pixel region P as the spreading property of the material solution 9 is increased.

The spreading property of the organic light emitting material solution 9 is determined by the surface tension of the organic light emitting material solution 9 and the surface tension of the first electrode 13 disposed in the pixel region P in contact with the dropping organic light emitting material solution 9. [ Is determined by the surface energy of the bank (7) disposed at the boundary between the pixel region (5) and the pixel region (P).

That is, as the surface tension of the organic luminescent material solution 9 is smaller, the spreadability of the organic luminescent material solution 9 is improved. As the surface energy of the surface contacting the dropping organic luminescent material solution 9 is larger, Spreadability is improved.

On the other hand, since the organic luminescent material solution 9 having a small surface tension is unevenly dried in the drying process to lower the uniformity of the thickness of the organic luminescent layer 10, the organic luminescent material solution 9 having a relatively large surface tension 9) is used.

In addition, the first electrode 5 is made of a transparent conductive material having a relatively large work function value to serve as an anode electrode, and the bank 7 is made of an organic material, and the surface of the first electrode 5 is hydrophobic .

At this time, the surface energy of the surface contacting the organic luminescent material solution 9 is compared with that of the upper surface of the bank 7 (i.e., the first electrode 5 is the sidewall of the bank 7).

Accordingly, the upper surface of the bank 7 has the smallest surface energy, thereby serving as a partition wall for preventing the organic light emitting material solutions 9 of each pixel region P from being mixed with each other.

Since the sidewall of the bank 7 has a higher surface energy than the first electrode 5 as shown in Fig. 2 (a) the organic light emitting material solution 9 dropping is shifted to the side wall of the bank 7.

On the other hand, when the drop amount of the organic light emitting material solution 9 in which the dropped organic light emitting material solution 9 spreads entirely in the first electrode 5 of the pixel region P is minimized and the number of drops of the organic luminescent material solution 9 for forming the thickness of the target organic luminescent layer 10 is referred to as the target thickness drop number.

At this time, the dropped organic light emitting material solution 9 has a convex shape due to the relatively high surface tension, and the dropped organic light emitting material solution 9 flows into the side wall of the bank 7 The minimum number of drops may be larger than the target thickness drop number.

Accordingly, as shown in FIG. 2 (b), the thickness of the organic light emitting layer 10 formed after the drying process becomes larger than the target thickness T, and the display quality of the organic light emitting display device is deteriorated .

Particularly, this problem is caused by the fact that as the area of the pixel region P is larger, the distance between the organic light emitting material solutions 9 dropped on the first electrode 5 of the pixel region P becomes longer .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an organic light emitting device which prevents a solution of an organic luminescent material dropped during a soluble process from being biased toward a bank, And an object thereof is to provide such an improved organic electroluminescence detecting apparatus.

According to an aspect of the present invention, there is provided a display device including a substrate including a pixel region, a first electrode arranged in a pixel region on the substrate, a first electrode covering the first electrode edge, An auxiliary pattern disposed above the first electrode in the form of a solid line or a broken line along the center of the pixel region in the major axis direction or the minor axis direction of the pixel region, and a second pattern, which is exposed above the first bank edge, And an organic light emitting display device.

A first electrode disposed on a pixel region above the protective layer and having an opening for exposing the protective layer; and a second electrode covering the first electrode edge, And a second bank disposed above the first bank and exposing the edge of the first bank, wherein the opening is arranged in the major axis direction or in the minor axis direction of the pixel region so that the center of the pixel region The organic electroluminescent display device is arranged in a dashed line.

In addition, both side edges of the first electrode forming the opening have a tapered shape.

The plasma display device further includes an auxiliary pattern disposed over the protective layer exposed by the opening and covering both side edges of the first electrode forming the opening.

The organic light emitting device further includes an organic light emitting layer disposed on the first electrode and the auxiliary pattern, and a second electrode disposed on the second bank and the organic light emitting layer.

The organic light emitting device further includes an organic light emitting layer disposed on the protective layer exposed by the first electrode and the opening, and a second electrode disposed on the second bank and the organic light emitting layer.

The auxiliary pattern may be made of an organic material or an inorganic material, or may be made of the same material as the first bank.

Further, the first bank is made of an inorganic material having hydrophilicity, and the second bank is made of an organic material having hydrophobicity.

A first electrode disposed on a pixel region above the protective layer and having an opening for exposing the protective layer; and a second electrode covering the first electrode edge, And a bank disposed in a boundary of the pixel region above the layer, wherein the opening is arranged in a dashed line along the center of the pixel region in the major axis direction or the minor axis direction of the pixel region.

In addition, both side edges of the first electrode forming the opening have a tapered shape.

The organic light emitting device further includes an organic light emitting layer disposed on the protective layer exposed by the first electrode and the opening, and a second electrode disposed on the bank and the organic light emitting layer.

Further, the bank is made of an organic material having hydrophobicity.

The present invention has the effect of improving the display quality of the organic electroluminescence imaging apparatus by forming the thickness of the organic light emitting layer to a target thickness.

In addition, the thickness uniformity of the organic light-emitting layer can be improved by alleviating the phenomenon of being rolled up to the side wall of the bank (hereinafter referred to as " pile-up phenomenon ").

1 is a plan view showing a conventional organic light emitting display device.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, illustrating a process of depositing an organic light emitting layer in a pixel region by a solution process.
3 is a plan view of an organic light emitting display according to a first embodiment of the present invention.
FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, illustrating a process of depositing an organic light emitting layer in a pixel region by a solution process.
5 is a plan view of an organic light emitting display according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5, illustrating a process of depositing an organic light emitting layer in a pixel region by a solution process.
7 is a plan view of an organic light emitting display according to a third embodiment of the present invention.
FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7, illustrating a process of depositing an organic light emitting layer in a pixel region by a solution process.
FIG. 9 is a plan view of an organic light emitting display according to a fourth embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line X - X of FIG. 9, illustrating a process of stacking an organic light emitting layer in a pixel region by a solution process Fig.

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

≪ Embodiment 1 >

FIG. 3 is a plan view of an organic light emitting display according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, illustrating a process of stacking an organic light- Fig.

More specifically, FIG. 4 (a) is a view showing a dropping process in a solution process, and FIG. 4 (b) is a view showing a state in which an organic light emitting layer is laminated after a solution process.

As shown in the drawing, an organic light emitting display device according to the first embodiment of the present invention includes a substrate 101 including a pixel region P, a protective layer 103 disposed on the substrate 101, A first electrode 105 arranged in the pixel region P above the protective layer 103, a first bank 108 partitioning the pixel region P and arranged at the boundary of the pixel region P, An auxiliary pattern 120 disposed on the first electrode 105 and a second bank 107 disposed on the first bank 108. [

Specifically, the protective layer 103 is disposed on the substrate 101, and the first electrode 105 is disposed on the pixel region P above the protective layer 103.

In this case, the protective layer 103 may be formed of an organic material such as photo acryl or benzocyclobutene (BCB), and the first electrode 105 may be formed of a transparent conductive material such as indium-tin- Oxide (ITO) or indium-zinc-oxide (IZO).

The first bank 108 covers the edge of the first electrode 105 and is disposed at the border of the pixel region P above the protective layer 103 and the auxiliary pattern 120 is formed on the top of the first electrode 105 Are arranged in a dashed line along the center of the pixel region (P) in the major axis direction and / or the minor axis direction of the pixel region (P).

At this time, as shown in the drawing, the auxiliary pattern 120 can be arranged in the major axis direction and the minor axis direction of the pixel region P, but only in the major axis direction or the minor axis direction of the pixel region P .

The first bank 108 may be made of an inorganic material such as SiO2 or SiNx having a hydrophilic property or may be made of polyacrylic, polyimide, polyamide (PA), benzocyclobutene (BCB) And an organic material such as phenol resin.

At this time, the auxiliary pattern 120 is preferably made of the same material as the first bank 108.

Thus, by forming the auxiliary pattern 120 together with the first bank 108, the manufacturing process can be simplified and the manufacturing cost can be reduced.

On the other hand, although the auxiliary patterns 120 are shown in a dashed line in the figure, they may be arranged in a solid line.

The second bank 107 exposes the edge of the first bank 108 and is disposed above the first bank 108 and serves to confine the organic light emitting material solution 109 in the pixel region P. [

In this case, the second bank 107 may be formed of an organic material such as polyacryl, polyimide, polyamide (PA), benzocyclobutene (BCB) and phenol resin, It has hydrophobicity.

The organic light emitting layer 110 is disposed on the first electrode 105 and the auxiliary pattern 120 and the second electrode is disposed on the second bank 107 and the organic light emitting layer 110.

On the other hand, the organic light emitting layer 110 is laminated by a soluble process such as an inkjet printing method or a nozzle printing method.

Hereinafter, a process of laminating the organic light emitting layer 110 in a soluble process will be described.

First, as shown in FIG. 4 (a), the organic light emitting material solution 109 is dropped onto the first electrode 105 of the pixel region P.

At this time, as the spreading property of the dropping organic light emitting material solution 109 is increased, the organic light emitting material solution 109 spreads evenly throughout the pixel region P to increase the uniformity of the thickness of the organic light emitting layer 110 Can be improved.

The spreading property of the organic light emitting material solution 109 is determined by the surface tension of the organic light emitting material solution 109 and the surface tension of the first electrode 102 disposed in the pixel region P, Is determined by the surface energy of the first and second banks 108 and 107 arranged at the boundary between the auxiliary pattern 105 and the auxiliary pattern 120 and the pixel region P. [

That is, the smaller the surface tension of the organic luminescent material solution 109 is, the better the spread of the organic luminescent material solution 109 is. As the surface energy of the surface contacting the dropped organic luminescent material solution 109 becomes larger Spreadability is improved.

On the other hand, since the organic luminescent material solution 109 having a small surface tension is unevenly dried in the drying process to lower the uniformity of the thickness of the organic luminescent layer 110, the organic luminescent material solution 109 having a relatively large surface tension 109) is used.

The first electrode 105, the first bank 108, and the auxiliary pattern 120 are in the order of the second bank 107, the first bank 105, the first bank 108, and the auxiliary pattern 120, .

Thus, the second bank 107 has the smallest surface energy, thereby preventing the organic luminescent material solution 109 in each pixel region P from being mixed with each other.

As shown in the drawing, the auxiliary pattern 120 having the same surface energy as that of the first bank 108 is formed on the first electrode 105 in the major axis direction and / or the minor axis direction of the pixel region P, The organic light emitting material 109 dropped in the pixel region P is prevented from being biased toward the first bank 108 by arranging the organic light emitting material 109 along the center of the region P. [

On the other hand, when the drop amount of the organic light emitting material solution 109, which is the minimum amount of the dropping organic light emitting material solution 109 spread over the first electrode 105 of the pixel region P, and the number of drops of the organic luminescent material solution 109 for forming the thickness of the target organic luminescent layer 110 is referred to as the target thickness drop number.

The organic electroluminescent display device according to the first embodiment of the present invention includes an organic light emitting material solution 109 in which an auxiliary pattern 120 disposed on a first electrode 105 is dropped, It is possible to prevent the minimum number of drops from becoming larger than the target number of the thickness drops by avoiding shifting toward the bank 108 side.

Accordingly, as shown in FIG. 4 (b), after the drying process, the thickness of the organic light emitting layer 110 may be formed as the target thickness T, thereby improving the display quality of the organic electroluminescent imaging apparatus.

In addition, since the first bank 108 has hydrophilicity, it relieves the phenomenon (hereinafter referred to as a pile-up phenomenon) that the edge portion of the organic light emitting layer 110 is curled up to the side wall of the second bank 107 in the drying process, It is possible to improve the uniformity of the thickness of the substrate 110.

≪ Embodiment 2 >

FIG. 5 is a plan view of an organic light emitting display according to a second embodiment of the present invention. FIG. 6 is a sectional view taken along the line VI-VI in FIG. Fig.

More specifically, FIG. 6 (a) is a view illustrating a dropping process during a solution process, and FIG. 6 (b) is a view showing a state in which an organic light emitting layer is laminated after a solution process.

As shown in the drawing, an organic light emitting display device according to a second embodiment of the present invention includes a substrate 201 including a pixel region P, a protective layer 203 disposed on the substrate 201, A first electrode 205 arranged in the pixel region P above the protective layer 203, a first bank 208 partitioning the pixel region P and arranged at the boundary of the pixel region P, And a second bank 207 disposed above the one bank 208. [

Specifically, the first electrode 205 has an opening 225 for exposing the protective layer 203 and is disposed in the pixel region P above the protective layer 203.

In addition, the openings 225 are arranged in a dashed line along the center of the pixel region P in the major axis direction and / or the minor axis direction of the pixel region P. [

At this time, as shown in the drawing, the opening 225 can be arranged in the major axis direction and the minor axis direction of the pixel region P, but only in the major axis direction or the minor axis direction of the pixel region P .

8) covering the both sides of the first electrode (305 in Fig. 8) of the opening (325 in Fig. 8) of the third embodiment to be described later, A leakage current may be generated through both side edges of the first electrode 205 constituting the opening 225. [

The organic light emitting layer 210, which will be described later, has a taper shape in cross section at both sides of the first electrode 205 forming the opening 225. The first electrode 205 has a tapered shape, It is possible to prevent a leakage current generated through both side edges of the first electrode 205 forming the opening 225. [

At this time, it is preferable that the side surface of the first electrode 205 in the taper shape has an angle of 45 degrees or less from the top of the protective layer 203. [

The protective layer 203 may be formed of an organic material such as photo acryl or benzocyclobutene (BCB), and the first electrode 205 may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

The first bank 208 may be formed of an inorganic material such as SiO2 or SiNx having a hydrophilic property and may be disposed at a boundary portion of the pixel region P over the protective layer 203 to cover the edge of the first electrode 205, (PA), benzocyclobutene (BCB), and phenolic resin, which have hydrophilicity, and can be made of organic materials such as polyacrylics, polyimides, polyamides (PA), benzocyclobutene (BCB)

The second bank 207 exposes the edges of the first bank 208 and is disposed on the first bank 208 and serves to confine the organic emissive material solution 209 in the pixel region P. [

In this case, the second bank 207 may be formed of an organic material such as polyacryl, polyimide, polyamide (PA), benzocyclobutene (BCB) and phenol resin, It has hydrophobicity.

The organic light emitting layer 210 is disposed on the protective layer 203 exposed by the first electrode 205 and the opening 225 and the second electrode (not shown) (Not shown).

Meanwhile, the organic light emitting layer 210 is laminated by a soluble process such as an inkjet printing method or a nozzle printing method.

Hereinafter, a process of laminating the organic light emitting layer 210 by a soluble process will be described.

First, as shown in FIG. 6A, the organic light emitting material solution 209 is dropped onto the first electrode 205 of the pixel region P.

At this time, as the spreading property of the dropping organic light emitting material solution 209 is increased, the organic light emitting material solution 209 spreads evenly throughout the pixel region P to increase the uniformity of the thickness of the organic light emitting layer 210 Can be improved.

The spreading property of the organic light emitting material solution 209 is determined by the surface tension of the organic light emitting material solution 209 and the surface tension of the first electrode 209 disposed in the pixel region P in contact with the dropping organic light emitting material solution 209. [ Is determined by the surface energy of the first and second banks 208 and 207 disposed at the boundary between the protective layer 203 and the pixel region P.

That is, the smaller the surface tension of the organic luminescent material solution 209 is, the better the spread of the organic luminescent material solution 209 is. As the surface energy of the surface contacting the dropping organic luminescent material solution 209 is larger, Spreadability is improved.

On the other hand, since the organic luminescent material solution 209 having a small surface tension is unevenly dried during the drying process to lower the uniformity of the thickness of the organic luminescent layer 210, the organic luminescent material solution 209 having a relatively large surface tension 209) is used.

The first electrode 205, the first bank 208, and the protective layer 203 are in the order of the second bank 207, the first bank 205, the first bank 208, and the protective layer 203 in order to compare the surface energy of the surface contacting the organic luminescent material solution 209 .

Accordingly, the second bank 207 has the smallest surface energy, thereby preventing the organic light emitting material solution 209 of each pixel region P from being mixed with each other.

The protection layer 203 having the same surface energy as that of the first bank 208 is exposed through the opening 225 of the first electrode 205 and the opening 225 is formed in the pixel region The organic luminescent material solution 209 dropping in the pixel region P is disposed toward the first bank 208 by disposing the organic luminescent material solution 20 along the center of the pixel region P in the long axis direction and / Avoid bias.

On the other hand, when the drop amount of the organic light emitting material solution 209, which is the minimum amount of the dropping organic light emitting material solution 209 spread over the first electrode 205 of the pixel region P, and the number of drops of the organic luminescent material solution 209 for forming the thickness of the target organic luminescent layer 210 is referred to as the target thickness drop number.

In this case, the organic light emitting display according to the second embodiment of the present invention includes a protective layer 203 exposed through the opening 225 of the first electrode 205, 209 are not shifted toward the first bank 208, it is possible to prevent the minimum number of drops from exceeding the target number of thickness drops.

Accordingly, as shown in FIG. 6 (b), after the drying process, the thickness of the organic light emitting layer 210 may be formed to a target thickness T, thereby improving the display quality of the organic electroluminescent imaging apparatus.

Since the first bank 208 has hydrophilicity, it relaxes the phenomenon that the edge portion of the organic light emitting layer 210 is curled up to the side wall of the second bank 207 during the drying process (hereinafter referred to as a pile-up phenomenon) It is possible to improve the uniformity of the thickness of the insulating layer 210.

≪ Third Embodiment >

FIG. 7 is a plan view of an organic light emitting display according to a third embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7, illustrating a process of stacking an organic light emitting layer in a pixel region by a solution process Fig.

More specifically, FIG. 8 (a) is a view showing a dropping process during a solution process, and FIG. 8 (b) is a view showing a state in which an organic light emitting layer is laminated after a solution process.

As shown in the drawing, an organic light emitting display according to a third embodiment of the present invention includes a substrate 301 including a pixel region P, a protective layer 303 disposed on the substrate 301, A first electrode 305 arranged in the pixel region P above the protective layer 303, a first bank 308 arranged in the boundary between the pixel region P and the pixel region P, A second bank 307 disposed on one bank 308 and an auxiliary pattern 320 disposed on the pixel region P. [

Specifically, the first electrode 305 has an opening 325 exposing the protective layer 303 and is disposed in the pixel region P above the protective layer 303.

The openings 325 are arranged in a dashed line along the center of the pixel region P in the major axis direction and / or the minor axis direction of the pixel region P. [

At this time, as shown in the drawing, the opening 325 can be arranged in the major axis direction and the minor axis direction of the pixel region P, but only in the major axis direction or the minor axis direction of the pixel region P .

The protective layer 303 may be formed of an organic material such as photo acryl or benzocyclobutene (BCB), and the first electrode 305 may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

The first bank 308 covers the edge of the first electrode 305 and is disposed at the boundary of the pixel region P above the protective layer 303. The first bank 308 is formed of an inorganic material such as SiO2 or SiNx having a hydrophilic property, Such as polyacryl, polyimide, polyamide (PA), benzocyclobutene (BCB), and phenolic resin, having the above-described structure.

The auxiliary pattern 320 covers both edges of the first electrode 305 forming the opening 325 and the upper portion of the protective layer 303 exposed by the opening 325 provided in the first electrode 305 do.

The auxiliary pattern 320 is arranged along the center of the pixel region P in the major axis direction and / or the minor axis direction of the pixel region P as in the case of the opening portion 325. [

The auxiliary pattern 320 may be formed of the same material as that of the first bank 308.

Thus, by forming the auxiliary pattern 320 together with the first bank 308, the manufacturing process can be simplified and the manufacturing cost can be reduced.

The second bank 307 exposes the edges of the first bank 308 and is disposed above the first bank 308 and serves to confine the organic light emitting material solution 309 in the pixel region P. [

In this case, the second bank 307 may be formed of an organic material such as polyacryl, polyimide, polyamide (PA), benzocyclobutene (BCB) and phenol resin, It has hydrophobicity.

The organic light emitting layer 310 is disposed on the first electrode 305 and the auxiliary pattern 320 and the second electrode is disposed on the second bank 207 and the organic light emitting layer 310.

Meanwhile, the organic light emitting layer 310 is laminated by a soluble process such as an inkjet printing method or a nozzle printing method.

Hereinafter, a process of laminating the organic light emitting layer 310 in a soluble process will be described.

First, as shown in FIG. 8A, the organic light emitting material solution 309 is dropped onto the first electrode 305 of the pixel region P.

At this time, as the spreading property of the dropped organic light emitting material solution 309 is increased, the organic light emitting material solution 309 spreads evenly throughout the pixel region P, resulting in uniformity of the thickness of the organic light emitting layer 310 Can be improved.

The spreading property of the organic luminescent material solution 309 is determined by the surface tension of the organic luminescent material solution 309 and the surface tension of the first electrode 309 disposed in the pixel region P in contact with the dropping organic luminescent material solution 309. [ Is determined by the surface energy of the first and second banks 308 and 307 disposed at the boundary between the auxiliary pattern 305 and the auxiliary pattern 320 and the pixel region P. [

That is, as the surface tension of the organic luminescent material solution 309 is decreased, the spreadability of the organic luminescent material solution 309 is improved. As the surface energy of the surface contacting the dropped organic luminescent material solution 309 is larger, Spreadability is improved.

On the other hand, since the organic luminescent material solution 309 having a small surface tension is unevenly dried in the drying process to lower the uniformity of the thickness of the organic luminescent layer 310, the organic luminescent material solution 309 having a relatively large surface tension 309) is used.

The first electrode 305, the first bank 308, and the auxiliary pattern 320 are arranged in the order of the second bank 307, the first electrode 305, the first bank 308, and the auxiliary pattern 320 in order to compare the surface energy of the surface in contact with the organic luminescent material solution 309 .

Accordingly, the second bank 307 has the smallest surface energy, thereby preventing the organic luminescent material solution 309 in each pixel region P from being mixed with each other.

As shown in the drawing, the auxiliary pattern 320 having the same surface energy as that of the first bank 308 is arranged along the center of the pixel region P in the major axis direction and / or the minor axis direction of the pixel region P Thereby preventing the organic luminescent material solution 309 dropping in the pixel region P from leaning toward the first bank 308. [

On the other hand, when the drop amount of the organic light emitting material solution 309, which is the minimum amount of the organic light emitting material solution 309 that is dropped on the first electrode 305 of the pixel region P, and the number of drops of the organic luminescent material solution 309 for forming the thickness of the target organic luminescent layer 310 is referred to as the target thickness drop number.

In this case, the organic light emitting display according to the third embodiment of the present invention includes the organic light emitting material solution 309 in which the auxiliary pattern 320 disposed in the pixel region P is dropped, 308, it is possible to prevent the minimum number of drops from exceeding the target thickness drop number.

Accordingly, as shown in FIG. 8 (b), after the drying process, the thickness of the organic light emitting layer 310 may be formed to a target thickness T, thereby improving the display quality of the organic electroluminescence detecting apparatus.

Since the first bank 308 has hydrophilicity, it relieves the phenomenon of the edge portion of the organic light emitting layer 310 being curled up to the side wall of the second bank 307 during the drying process (hereinafter referred to as a pile-up phenomenon) It is possible to improve the uniformity of the thickness of the substrate 310.

<Fourth Embodiment>

FIG. 9 is a plan view of an organic light emitting display according to a fourth embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line X - X of FIG. 9, illustrating a process of stacking an organic light emitting layer in a pixel region by a solution process Fig.

10 (a) is a view showing a dropping process during a solution process, and FIG. 10 (b) is a view showing a state in which an organic light emitting layer is laminated after a solution process.

The organic light emitting display device according to the fourth embodiment of the present invention includes a substrate 401 including a pixel region P, a protective layer 403 disposed on the substrate 401, A first electrode 405 disposed in the pixel region P above the protective layer 403 and a bank 407 partitioning the pixel region P and disposed at the boundary of the pixel region P. [

Specifically, the first electrode 405 has an opening 425 for exposing the protective layer 403 and is disposed in the pixel region P above the protective layer 403. [

The openings 425 are arranged in a dashed line along the center of the pixel region P in the major axis direction and / or the minor axis direction of the pixel region P. [

At this time, as shown in the drawing, the opening 425 can be arranged in the major axis direction and the minor axis direction of the pixel region P, but only in the major axis direction or the minor axis direction of the pixel region P .

On the other hand, the fourth embodiment according to the present invention is the same as the protection pattern (320 in Fig. 8) covering the both sides of the first electrode (305 in Fig. 8) of the opening (325 in Fig. 8) A leakage current may be generated through both side edges of the first electrode 405 constituting the opening 425. [

The organic light emitting layer 410 has a tapered shape in cross section at both sides of the first electrode 405 forming the opening 425. The organic light emitting layer 410 is formed on the tapered first electrode 405 It is possible to prevent a leakage current generated through both side edges of the first electrode 405 forming the opening 425. [

At this time, it is preferable that the side surface of the first electrode 405 has a taper shape at an angle of 45 degrees or less from the top of the protective layer 403.

The protective layer 403 may be formed of an organic material such as photo acryl or benzocyclobutene (BCB), and the first electrode 405 may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

The bank 407 covers the edge of the first electrode 405 and is disposed at the boundary of the pixel region P above the protective layer 403. The bank 407 covers the organic light emitting material solution 409 in the pixel region P It plays a role.

In this case, the bank 407 may be made of an organic material such as polyacryl, polyimide, polyamide (PA), benzocyclobutene (BCB) and phenol resin, The surface becomes hydrophobic.

The organic light emitting layer 410 is disposed on the protective layer 403 exposed by the first electrode 405 and the opening 425 and the second electrode is disposed on the bank 407 and the organic light emitting layer 410 .

Meanwhile, the organic light emitting layer 410 is laminated by a soluble process such as an inkjet printing method or a nozzle printing method.

Hereinafter, a process of laminating the organic light emitting layer 410 in a soluble process will be described.

10 (a), the organic light emitting material solution 409 is dropped onto the first electrode 405 of the pixel region P by dropping.

At this time, as the spreadability of the dropping organic light emitting material solution 409 is increased, the organic light emitting material solution 409 spreads evenly throughout the pixel region P, resulting in a uniformity of the thickness of the organic light emitting layer 410 Can be improved.

The spreading property of the organic light emitting material solution 409 is determined by the surface tension of the organic light emitting material solution 409 and the surface tension of the first electrode 409 disposed in the pixel region P in contact with the dropping organic light emitting material solution 409. [ And the surface energy of the bank 407 disposed at the boundary between the pixel electrode 405 and the protective layer 403 and the pixel region P. [

That is, as the surface tension of the organic luminescent material solution 409 is decreased, the spreadability of the organic luminescent material solution 409 is improved. As the surface energy of the surface contacting the dropped organic luminescent material solution 409 is greater, Spreadability is improved.

On the other hand, since the organic luminescent material solution 409 having a small surface tension is unevenly dried in the drying process to lower the uniformity of the thickness of the organic luminescent layer 410, the organic luminescent material solution 409 having a relatively large surface tension 409) is used.

The surface energy of the surface contacting the organic luminescent material solution 409 is compared with that of the upper surface of the bank 407 in the order of the first electrode 205, the sidewall of the bank 407, to be.

Accordingly, the upper surface of the bank 407 has the smallest surface energy, thereby preventing the organic light emitting material solution 409 of each pixel region P from being mixed with each other.

The protection layer 403 having the same surface energy as the side wall of the bank 407 is exposed through the opening 425 of the first electrode 405 and the opening 425 is formed in the pixel region 405. [ The organic luminescent material solution 409 dropping in the pixel region P is directed toward the side wall of the bank 407 by disposing the organic luminescent material 409 along the center of the pixel region P in the major axis direction and / Avoid bias.

On the other hand, when the drop amount of the organic light emitting material solution 409, which is the minimum amount of the organic light emitting material solution 409 that is dropped on the first electrode 405 of the pixel region P, and the number of drops of the organic luminescent material solution 409 for forming the thickness of the target organic luminescent layer 410 is referred to as a target thickness drop number.

The organic light emitting display according to the fourth exemplary embodiment of the present invention includes a protective layer 403 exposed through the opening 425 of the first electrode 405, 409 are not shifted toward the side wall of the bank 407, the minimum number of drops can be prevented from becoming larger than the target number of thickness drops.

Accordingly, as shown in FIG. 10 (b), the thickness of the organic light emitting layer 410 may be formed to a target thickness T after the drying process, thereby improving the display quality of the organic electroluminescent imaging apparatus.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit of the present invention.

101: substrate
103: Protective layer
105: first electrode
108 and 107: first and second banks
120: auxiliary pattern

Claims (16)

delete delete delete delete delete A substrate comprising a pixel region;
A protective layer disposed on the substrate;
A first electrode having an opening exposing the passivation layer and disposed in the pixel region above the passivation layer;
A first bank which covers the first electrode edge and is disposed at a boundary of the pixel region above the protection layer;
A second bank which exposes the edge of the first bank and is disposed above the first bank; And
And an organic light emitting layer having a flat upper surface disposed on the first electrode and the upper portion of the protective layer exposed by the opening
Including,
Wherein the opening includes a first opening in the form of a broken line extending in a first direction and a second opening in the form of a broken line extending in a second direction perpendicular to the first direction and the first opening and the second opening Intersect each other at the center of the pixel region,
Wherein the protective layer and the first bank have the same surface energy.
The method according to claim 6,
Wherein the first electrode and the second electrode have a tapered cross-section at both edges of the first electrode.

8. The method of claim 7,
And a second electrode disposed above the organic light emitting layer.
The method according to claim 6,
An auxiliary pattern covering the upper portion of the protective layer exposed by the first opening portion and the second opening portion and the side edges of the first electrode constituting the first opening portion and the second opening portion,
And an organic light emitting diode (OLED).

10. The method of claim 9,
And a second electrode disposed above the organic light emitting layer.
11. The method of claim 10,
Wherein the first bank is made of an inorganic material or an organic material having hydrophilicity, and the second bank is made of an organic material having hydrophobicity.

12. The method of claim 11,
Wherein the auxiliary pattern is made of the same material as the first bank.

A substrate comprising a pixel region;
A protective layer disposed on the substrate;
A first electrode having an opening exposing the passivation layer and disposed in the pixel region above the passivation layer;
A bank which covers the first electrode edge and is disposed in the pixel region boundary portion above the protection layer; And
The organic light emitting device according to claim 1, wherein the first electrode and the organic light emitting layer
/ RTI &gt;
Wherein the opening includes a first opening in the form of a broken line extending in a first direction and a second opening in the form of a broken line extending in a second direction perpendicular to the first direction and the first opening and the second opening And intersecting each other at the center of the pixel region.


14. The method of claim 13,
Wherein the first electrode and the second electrode have a tapered cross-section at both edges of the first electrode.

15. The method of claim 14,
And a second electrode disposed above the organic light emitting layer.
16. The method of claim 15,
Wherein the bank is made of an organic material having hydrophobicity.

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CN106953030B (en) * 2017-03-29 2018-11-09 京东方科技集团股份有限公司 A kind of production method of film, making apparatus and display base plate and preparation method thereof

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TWI670846B (en) * 2017-09-30 2019-09-01 大陸商雲谷（固安）科技有限公司 Terminal and display screen
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