KR100667242B1 - Organic electro-luminescence display and fabricating method thereof - Google Patents

Abstract

An organic electro-luminescence display device and a method for manufacturing the same are provided to efficiently prevent a sealant doped on a seal line region from flowing in or out by preventing the sealant doped on the seal line region from flowing in an organic electro-luminescence array or flowing out an outer region of the seal line region. An organic electro-luminescence display device includes a substrate(102), a cap(170), at least two dummy layers(114,115), and a protection partition wall(158). An organic electro-luminescence array is formed on the substrate(102). The cap(170) is contacted with the substrate(102) on a seal line region located on an outer side of the organic electro-luminescence array through a sealant. The at least two dummy layers(114,115) are apart from each other and are formed to be parallel with the sealant on the seal line region. The protection partition wall(158) is formed on at least two dummy layers(114,115). A data line and a scan line are cross with each other with interposing an organic light emitting layer(110) therebetween. An insulation layer(106) exposes a region on which the organic light emitting layer(110) is formed on the data line(104). A partition wall(108) separating the scan line is formed on the insulation layer(106). The protection partition wall(158) is formed to have the same material with the partition wall(108).

Description

Organic electroluminescent display and its manufacturing method {ORGANIC ELECTRO-LUMINESCENCE DISPLAY AND FABRICATING METHOD THEREOF}

1 is a schematic view of a conventional organic electroluminescent display.

FIG. 2 is a view showing specifically the region A shown in FIG. 1. FIG.

3 is a cross-sectional view taken along lines II ′ and II-II ′ of FIG. 2.

4A to 4B are diagrams for describing shadows generated in the display area by barrier ribs and insulating films.

5 is a plan view illustrating a portion of an organic electroluminescent display according to an exemplary embodiment of the present invention.

6 is a cross-sectional view taken along line III-III ′, IV-IV ′, and V-V ′ of FIG. 5.

7A to 7F are cross-sectional views illustrating a method of manufacturing an organic light emitting display device according to an exemplary embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

2, 102: substrate 4, 104: data line

6, 106 insulating film 8, 108: partition wall

10, 110: organic light emitting layer 12, 112: scan line

25, 125: Sealant 52, 152: Scan link

54: data link 58, 158: protective bulkhead

70, 170: cap 114: dummy transparent layer

115: dummy opaque layer 116: dummy insulating film

The present invention relates to an organic electroluminescent display, and more particularly, to an organic electroluminescent display capable of improving yield and a method of manufacturing the same.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. As a flat panel display, a liquid crystal display (hereinafter referred to as "LCD"), a field emission display (FED), and a plasma display panel (hereinafter referred to as "PDP") And an electro-luminescence display (hereinafter, referred to as “EL”) display device.

PDP is most advantageous for the large screen because of its relatively simple structure and manufacturing process, but it has the disadvantages of low luminous efficiency, low luminance and high power consumption.

As LCDs are mainly used as display elements in notebook computers, demand is increasing. However, since LCD is manufactured by a semiconductor process, it is difficult to make a large screen and because it is not a self-emitting device, a separate light source is required and power consumption is large due to the light source. In addition, LCD has a disadvantage of high light loss and a narrow viewing angle due to optical elements such as a polarizing filter, a prism sheet, and a diffusion plate.

The EL display device is roughly classified into an inorganic EL display device and an organic EL display device, and has advantages of fast response speed and high luminous efficiency, brightness, and viewing angle. The organic EL display can display an image with a high luminance of tens of thousands [cd / m 2] at a voltage around 10 [V], and is applied to most EL displays that are commercially available.

1 is a diagram schematically showing a conventional organic EL display device.

Referring to FIG. 1, a conventional organic EL display device includes a display area P1 in which an organic EL array including driving electrodes (eg, data lines and scan lines) intersecting each other with an organic light emitting layer interposed therebetween. And a non-display area P2 in which a pad part for supplying a driving signal to the driving electrodes of the display area P1 is located.

As shown in FIGS. 2 and 3, the organic EL array in the display area P1 is referred to as a first electrode (hereinafter, referred to as a “data line”) intersecting each other with the organic light emitting layer 10 interposed therebetween on the substrate 2. 4, a second electrode (hereinafter referred to as a “scan line”) 12, an insulating film 6 exposing a region where the organic light emitting layer 10 is to be formed on the data line 4, A partition 8 is provided across the data line 4.

A plurality of data lines 4 are formed on the substrate 2 as a transparent electrode layer at a predetermined interval.

The organic light emitting layer 10 is formed by stacking a hole transport layer, a light emitting layer, and an electron transport layer on the data line 4.

A plurality of scan lines 12 are formed on the organic emission layer 10 to cross the data lines 4.

The insulating film 6 is formed to have an opening in each region where the organic light emitting layer 10 is to be formed on the substrate 2 on which the data line 4 is formed.

The partition 8 is formed on the insulating film 6 in an overhang structure in which the upper end portion has a wider width than the lower end portion for separation of the scan line 12.

In the non-display area P2, a data link 54 extending from the data line 4 of the display area P1 and data pads for supplying a data voltage to the data line 4 through the data link 54 are formed. The scan link 52 connected to the scan line 12 and a scan pad for supplying a scan voltage to the scan line 12 through the scan link 52 are provided.

The organic EL array of the display area P1 is easily deteriorated by moisture, oxygen, or the like. Accordingly, the organic EL array of the display region P1 is bonded to the cap 70 through the sealant 25 applied to the seal line region P3 on the substrate 2 by performing an encapsulation process.

The sealant 25 is surrounded by a protective partition 58 formed side by side while maintaining a predetermined distance from the left and right of the seal line region P3. The protective partition 58 is formed in the same process as the partition 8 of the display area P1, and prevents the sealant 25 from flowing into the organic EL array of the display area P1 and the sealant 25 is prevented from entering. It serves to prevent the outflow to the outer region of the seal line region (P3).

Since the protective partition wall 58 is formed in the same process as the partition wall 8 of the organic EL array, it has a height lower than that of the sealant 25 applied to the seal line region P3 as shown in FIG. 3. As a result, the organic EL display has a problem such that the sealant 25 flows into the organic EL array or flows out to the outer portion of the seal line region P3, and the sealant 25 flows into the organic EL array or the seal line. When the organic EL display device leaks out to the outer portion of the area P3, the organic EL display device is determined to be defective, and thus the yield thereof is lowered.

In order to solve this problem, the protective partition 58 of the organic EL display device is formed at the same height as the sealant 25 applied to the seal line region P3 or has a height higher than that of the sealant 25 applied. Has been proposed.

However, in order to increase the height of the protective partition 58, the organic EL display device having such a structure must raise the height of the partition 8 of the organic EL array formed in the same process as the protective partition 58.

When the height of the partition wall 8 of the organic EL array is raised in this manner, the brightness of the organic EL display device is lowered.

The lowering of the luminance of the organic EL display will be described with reference to FIGS. 4A and 4B. The partition wall 8 of the organic EL display has an overhang shape in order to separate the scan lines 12. As shown in FIG. 4A, the overhang-shaped partition wall 8 has a shadow area S in which the organic light emitting layer 10 is not deposited. The shadow area S is a phenomenon that occurs when the overhang-shaped partition wall 8 covers the area where the organic light emitting layer 10 is to be formed when the organic light emitting material is applied to form the organic light emitting layer 10. S) has a characteristic of increasing as the height of the overhang-shaped partition wall 8 increases, such as 4b.

For this reason, the organic EL display device cannot raise the height of the protective partition 58 formed in the same process as the partition wall 8 of the organic EL array. Accordingly, the organic EL display device has a sealant 25 flowing into the organic EL array. Or still leaking to the outer portion of the seal line region P3, which has a disadvantage in that the yield is lowered.

Accordingly, it is an object of the present invention to provide an organic EL display device and a method of manufacturing the same which can improve the yield.

In order to achieve the above object, an organic electroluminescent display device according to an embodiment of the present invention comprises a substrate formed with an organic electroluminescent array; A cap bonded to the substrate through a sealant in a seal line region located outside the organic electroluminescent array; At least two dummy layers spaced apart from each other in the seal line region to be parallel to the sealant; And a protective partition formed on the at least two dummy layers.

The organic electroluminescent array includes: a data line and a scan line crossing each other with an organic light emitting layer interposed therebetween; An insulating film exposing a region where the organic light emitting layer is to be formed on the data line; A partition wall is formed on the insulating layer to separate the scan line, and the protective partition wall is formed of the same material as the partition wall.

The at least two dummy layers may include a dummy transparent layer formed of the same material as the data line; A dummy insulating film formed of the same material as the insulating film; And a plurality of dummy opaque layers formed between the dummy transparent layer and the dummy insulating film.

The at least two dummy layers are formed on the left and right sides of the seal line region, respectively.

The organic electroluminescent display device includes a transparent conductive layer and an opaque conductive layer of a data link in which the data line extends between the organic electroluminescent array and the seal line region, a transparent conductive layer of a scan link connected to the scan line; An opaque conductive layer is further provided, wherein the multiple dummy opaque layers are the same material as the opaque conductive layers of the data link and the scan link.

The plurality of dummy opaque layers may include a first metal layer formed on the dummy transparent layer; An aluminum (Al) layer formed on the first metal layer; A second metal layer formed on the aluminum (Al) layer is provided.

The organic electroluminescent array further includes a bus line formed on the data line with a narrower width than the data line, wherein the bus line is the same material as the multiple dummy opaque layers.

The first and second metal layers include at least one metal of chromium (Cr), molybdenum (Mo), or copper (Cu).

A method of manufacturing an organic electroluminescent display device according to an embodiment of the present invention includes spaced apart from left and right of a data line and an outer seal line region of the organic electroluminescent array region on a substrate; Forming a plurality of dummy opaque layers on a single layer forming a dummy transparent layer parallel to the sealant applied to the seal line region as well as the dummy transparent layer; Forming an insulating film exposing a region where an organic light emitting layer is to be formed in the organic electroluminescent array region and a dummy insulating film on the plurality of dummy opaque layers; Forming a protective barrier on the insulating layer and the dummy insulating layer on the insulating layer; Forming the organic light emitting layer on the data line; Forming a scan line separated from each other by the partition wall and intersecting the data line with the organic light emitting layer interposed therebetween; Bonding the cap and the substrate through the sealant.

The forming of the plurality of dummy opaque layers includes: depositing a first metal on the dummy transparent layer; Stacking aluminum (Al) on the first metal layer; Stacking a second metal on the aluminum (Al) layer; Patterning the first metal, the aluminum (Al), and the second metal that are sequentially stacked.

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 7F.

5 is a cross-sectional view illustrating a part of an organic EL display device according to an exemplary embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along lines III-III ', IV-IV', and V-V 'of FIG. 5. .

5 and 6, an organic EL display device according to an exemplary embodiment of the present invention includes a display area P1 in which an organic EL array is formed, and a pad unit for supplying driving signals to driving electrodes in the display area P1. The non-display area P2 positioned and the seal line area P3 to which the sealant 125 is applied are disposed at the outer portion of the non-display area P2. In addition, the organic EL display device includes a cap 170 that seals the display area P1 through the sealant 125 applied to the seal line area P3.

The organic EL array of the display area P1 includes a first electrode 104 (hereinafter, referred to as a “data line”) 104 and a second electrode that cross each other on the substrate 102 with the organic light emitting layer 110 therebetween. Hereinafter, referred to as a “scan line” 112, an insulating film 106 exposing a region where the organic light emitting layer 110 is to be formed on the data line 104, and a partition 108 crossing the data line 104. ).

A plurality of data lines 104 are formed on the substrate 102 as a transparent electrode layer at predetermined intervals.

The organic light emitting layer 110 is formed by stacking a hole transport layer, a light emitting layer, and an electron transport layer on the data line 104.

A plurality of scan lines 112 are formed on the organic emission layer 110 to intersect the data lines 104.

The insulating layer 106 is formed to have an opening in each region where the organic light emitting layer 110 is to be formed on the substrate 102 on which the data line 104 is formed.

The partition 108 is formed on the insulating layer 106 in an overhang structure in which the upper end portion has a wider width than the lower end portion for separation of the scan line 112.

In the non-display area P2, a data link (not shown) extended from the data line 104 of the display area P1 and data pads for supplying a data voltage to the data line 104 through the data link are formed. A scan link 152 connected to the scan line 112 and a scan pad for supplying a scan voltage to the scan line 112 through the scan link 152 are provided.

The data link and the scan link 152 have a transparent conductive layer 152a formed in the same process as the data line 104 of the display area P1, and a plurality of opaque conductive layers stacked on the transparent conductive layer 152a. 152b.

The sealant 125 applied to the seal line region P3 is formed side by side while maintaining a predetermined distance from the left and right of the seal line region P3 so that the sealant 125 flows into the organic EL array of the display region P1. In addition, the sealant 125 may be surrounded by protective patterns that prevent the sealant 125 from leaking to the outer region of the seal line region P3.

These protective patterns are formed on the dummy transparent layer 114 formed in the same process as the data line 104 of the display area P1 and the multiple opaque conductive layers 152b of the non-display area P2 on the dummy transparent layer 114. The dummy dummy opaque layer 115 formed by the same process as the above and the dummy insulating film formed on the multiple dummy opaque layer 115 by the same process as the insulating film 106 and the partition wall 108 of the display area P1 ( 116 and protective barrier 158.

As described above, in the organic EL display device according to the exemplary embodiment, the sealant 125 having the conventional organic EL display device coated on the seal line region P3 flows into the display area P1 or the sealant 125 is sealed. Unlike forming only a protective barrier to prevent the outflow of the phosphorus region P3 outside, a dummy transparent layer 114, a plurality of dummy opaque layers 115, and a dummy insulating layer 116 are further disposed below the protective barrier 158. By forming and preventing, the inflow and outflow of the sealant 125 applied to the seal line region P3 can be effectively prevented. As a result, the yield of the organic EL display device is improved.

Here, the plurality of dummy opaque layers 115 may be formed on the first metal layer 115a formed of at least one metal of chromium (Cr), molybdenum (Mo), or copper (Cu) and on the first metal layer 115a. By including the aluminum (Al) layer 115b to be stacked and the second metal layer 115c to be stacked on the aluminum (Al) layer 115b, the height of the protection patterns may be further increased, and thus, the seal line region P3. ), The sealant 125 may be more effectively prevented from entering the display area P1 or the sealant 125 flowing out of the seal line area P3.

At this time, the aluminum (Al) layer 115b of the dummy opaque layer 115 may include indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin (ITZO). Oxidized by contact with zinc oxide), and the second metal layer 115c of the dummy opaque layer 115 is exposed to air in the aluminum (Al) layer 115b of the dummy opaque layer 115. prevent.

In addition, as the dummy transparent layer 114, the plurality of dummy opaque layers 115, and the dummy insulating layer 116 are formed under the protective barrier wall 158, the height of the protective barrier wall 158 may be lowered, thereby causing the display area ( The height of the barrier rib 108 of P1 can be lowered to improve the brightness of the organic EL display device.

Hereinafter, a method of manufacturing an organic EL display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 7A to 7F.

Referring to FIG. 7A, a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc oxide (ITZO) is deposited on the substrate 102 and then patterned, thereby displaying the display area P1. The dummy transparent layer 114 is formed in the data line 104, the non-display area P2, and the outer portion of the transparent conductive layer 152a of the data link (not shown) and the scan link and the seal line area P3.

Then, on the substrate 102, at least one metal of chromium (Cr), molybdenum (Mo) or copper (Cu), in turn, aluminum (Al), chromium (Cr), molybdenum (Mo) or copper At least one metal (Cu) is deposited on the entire surface, and is then patterned, thereby forming an opaque conductive layer 152b and a seal line region P3 of the data link (not shown) and the scan link in the non-display area P2 as shown in FIG. The dummy dummy opaque layer 115 is formed on the dummy transparent layer 114 at the outer side of the.

Here, a bus line (not shown) that is formed to have a narrower width than the data line 104 may be further formed on the data line 104 of the display area P1.

Subsequently, an insulating material is entirely coated on the substrate 102 and then patterned to expose an area where the organic light emitting layer 110 is to be formed on the data line 104 of the display area P1 as shown in FIG. 7C. The dummy insulating layer 116 is formed on the multiple dummy opaque layers 115 at the outer portion of the seal line region P3.

Subsequently, a partition 108 for separating the organic emission layer 110 and the scan line 112 is formed on the insulating layer 106 of the display area P1 in a direction crossing the data line 104, as shown in FIG. 7D. The protective partition 158 is formed on the dummy insulating layer 116 at the outer portion of the seal line region P3.

In addition, as shown in FIG. 7E, an organic light emitting material is deposited on the display area P1 on the substrate 102 on which the partition 108 is formed to form an organic light emitting layer 110, and the scan line 112 is connected to the electrode. It is formed through front deposition of material.

Thereafter, as shown in FIG. 7F, a sealant 125 is applied to the seal line region P3, and the substrate 102 and the cap 170 are bonded to each other through the sealant 125 to encapsulate the organic EL array of the display region P1. The organic EL display is completed.

As described above, the organic EL display device and the manufacturing method thereof according to the embodiment of the present invention form a dummy transparent layer 114, a plurality of dummy opaque layers 115, and a dummy insulating layer 116 under the protective barrier wall 158. The sealant applied to the seal line region P3 by preventing the sealant 125 applied to the phosphorus region P3 from flowing into the organic EL array of the display region P1 or outflowing to the outer region of the seal line region P3. Inflow and outflow of the 125 can be effectively prevented. As a result, the yield of the organic EL display device is improved.

As described above, the organic EL display device and the method of manufacturing the same according to the present invention form a dummy transparent layer, a plurality of dummy opaque layers, and a dummy insulating film under the protective partition wall so that the sealant applied to the seal line region is an organic EL array of the display region. It is possible to effectively prevent the inflow and outflow of the sealant applied to the seal line region by preventing the inflow into or out of the seal line region. As a result, the yield of the organic EL display device is improved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (13)

A substrate on which an organic electroluminescent array is formed; A cap bonded to the substrate through a sealant in a seal line region located outside the organic electroluminescent array; At least two dummy layers spaced apart from each other in the seal line region to be parallel to the sealant; And a protective barrier formed on the at least two dummy layers. The method of claim 1, The organic electroluminescent array, A data line and a scan line crossing each other with the organic light emitting layer interposed therebetween; An insulating film exposing a region where the organic light emitting layer is to be formed on the data line; A partition wall separating the scan line on the insulating layer, The protective barrier is formed of the same material as the barrier rib organic light emitting display device. The method of claim 2, The at least two dummy layers, A dummy transparent layer formed of the same material as the data line; A dummy insulating film formed of the same material as the insulating film; And a plurality of dummy opaque layers formed between the dummy transparent layer and the dummy insulating layer. The method of claim 1, And the at least two dummy layers are formed on the left and right sides of the seal line region, respectively. The method of claim 3, wherein Further comprising a transparent conductive layer and an opaque conductive layer of a data link extending the data line between the organic electroluminescent array and the seal line region, and a transparent conductive layer and an opaque conductive layer of a scan link connected to the scan line. , And the plurality of dummy opaque layers are formed of the same material as the opaque conductive layers of the data link and the scan link. The method of claim 3, wherein The multiple dummy opaque layer, A first metal layer formed on the dummy transparent layer; An aluminum (Al) layer formed on the first metal layer; And a second metal layer formed on the aluminum (Al) layer. The method of claim 3, wherein And a bus line formed on the data line with a narrower width than the data line. And the bus line is made of the same material as the plurality of dummy opaque layers. The method of claim 6, The first and second metal layers may include at least one metal of chromium (Cr), molybdenum (Mo), or copper (Cu). Forming a dummy transparent layer parallel to the sealant applied to the seal line region and spaced apart from each other at left and right sides of a data line and an outer seal line region of the organic electroluminescence array region on a substrate; Forming a plurality of dummy opaque layers on the dummy transparent layer; Forming an insulating film exposing a region where an organic light emitting layer is to be formed in the organic electroluminescent array region and a dummy insulating film on the plurality of dummy opaque layers; Forming a protective barrier on the insulating layer and the dummy insulating layer on the insulating layer; Forming the organic light emitting layer on the data line; Forming a scan line separated from each other by the partition wall and intersecting the data line with the organic light emitting layer interposed therebetween; And attaching the cap and the substrate through the sealant. The method of claim 9, Forming a transparent conductive layer of a data link in which the data line extends between the organic electroluminescent array region and the seal line region and a transparent conductive layer of a scan link connected to the scan line; Forming an opaque conductive layer on the transparent conductive layer of the data link and the transparent conductive layer of the scan link; The opaque conductive layers of the data link and the scan link are formed together with the plurality of dummy opaque layers. The method of claim 9, Forming the plurality of dummy opaque layers, Depositing a first metal on the dummy transparent layer; Stacking aluminum (Al) on the first metal layer; Stacking a second metal on the aluminum (Al) layer; And patterning the first metal, the aluminum (Al), and the second metal, which are sequentially stacked on the organic light emitting display device. The method of claim 9, Forming a bus line of a narrower width than the data line on the data line, And the bus line is formed together with the plurality of dummy opaque layers. The method of claim 11, The first and second metal layers may be formed of at least one metal of chromium (Cr), molybdenum (Mo), or copper (Cu).

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