Source: http://www.google.com/patents/US7994534?dq=6377161
Timestamp: 2017-11-20 01:34:21
Document Index: 725002920

Matched Legal Cases: ['Application No. 10', 'Application No. 2006', 'Application No. 2007100019898', 'application No. 07250352', 'application No. 07101149', 'Application No. 2006', 'Application No. 95146415', 'Application No. 95146822']

Patent US7994534 - Organic light emitting display device and a method of manufacturing thereof - Google Patents
Disclosed is an organic light emitting display device including a first substrate defining a pixel region and a non-pixel region. An organic light emitting element comprising a first electrode, an organic thin film layer and a second electrode are formed in the pixel region. A scan driver is formed in...http://www.google.com/patents/US7994534?utm_source=gb-gplus-sharePatent US7994534 - Organic light emitting display device and a method of manufacturing thereof
Publication number US7994534 B2
Application number US 11/540,366
Also published as CN100524807C, CN101009320A, EP1814175A2, EP1814175A3, EP1814175B1, US20070176171
Publication number 11540366, 540366, US 7994534 B2, US 7994534B2, US-B2-7994534, US7994534 B2, US7994534B2
Inventors Deuk Jong Kim, Seung Yong Song
Patent Citations (42), Non-Patent Citations (8), Referenced by (3), Classifications (21), Legal Events (4)
Organic light emitting display device and a method of manufacturing thereof
US 7994534 B2
Disclosed is an organic light emitting display device including a first substrate defining a pixel region and a non-pixel region. An organic light emitting element comprising a first electrode, an organic thin film layer and a second electrode are formed in the pixel region. A scan driver is formed in the non-pixel region. A second substrate is sealed spaced apart from the pixel region and the non-pixel region of the first substrate. A frit is formed along an edge of a non-pixel region of the second substrate, wherein the frit is formed so that it can be overlapped with a region excluding an active area of the scan driver formed in the non-pixel region.
an array of organic light emitting pixels formed over the pixel region of the first substrate;
a frit seal comprising a plurality of elongated segments interposed between the first and second substrates and disposed in the non-pixel region, the plurality of elongated segments in combination surrounding the array such that the array is encapsulated by the first substrate, the second substrate and the frit seal, the plurality of elongated segments comprising a first elongated segment elongated generally in a first direction;
a scan driver formed over the non-pixel region and comprising a semiconductive integrated circuit portion and a non-semiconductive integrated circuit portion, wherein the semiconductive integrated circuit portion and the first elongated segment extend generally parallel to each other without any one of the plurality of elongated segments interposed therebetween when viewed in a second direction from the first or second substrate, wherein the second direction defines the shortest distance between the first and second substrates, and wherein the first elongated segment does not overlap with the semiconductive integrated circuit portion and overlaps with the non-semiconductive integrated circuit portion when viewed in the second direction from the first or second substrate; and
a signal line portion, wherein the signal line portion comprises a plurality of conductive lines interconnecting the scan driver and the array, wherein the signal line portion is not formed over the pixel region, and wherein the first elongated segment overlaps with the signal line portion when viewed in the second direction from the first or second substrate,
wherein the semiconductive integrated circuit portion has a width defined in a third direction perpendicular to the first and second directions, and wherein the semiconductive integrated circuit portion and the first elongated segment have substantially no gap in the third direction when viewed in the second direction from the first or second substrate.
2. The device of claim 1, wherein the semiconductive integrated circuit portion comprises interconnected semiconductive circuit elements.
3. The device of claim 2, wherein the semiconductive circuit elements comprise thin film transistors.
4. The device of claim 1, further comprising a planarization layer formed between the first substrate and the frit, and wherein the scan driver is substantially buried in the planarization layer.
5. The device of claim 1, wherein the width is from about 0.02 mm to about 0.5 mm.
6. The device of claim 1, wherein the scan driver comprises a routing portion interposed between the semiconductive integrated circuit portion and the signal line portion, and wherein the first elongated segment overlaps with the routing portion when viewed in the second direction from the first or second substrate.
7. The device of claim 1, wherein the frit seal comprises one or more materials selected from the group consisting of magnesium oxide (MgO), calcium oxide (CaO), barium oxide (BaO), lithium oxide (Li2O), sodium oxide (Na2O), potassium oxide (K2O), boron oxide (B2O3), vanadium oxide (V2O5), zinc oxide (ZnO), tellurium oxide (TeO2), aluminum oxide (Al2O3), silicon dioxide (SiO2), lead oxide (PbO), tin oxide (SnO), phosphorous oxide (P2O5), ruthenium oxide (Ru2O), rubidium oxide (Rb2O), rhodium oxide (Rh2O), ferrite oxide (Fe2O3), copper oxide (CuO), titanium oxide (TiO2), tungsten oxide (WO3), bismuth oxide (Bi2O3), antimony oxide (Sb2O3), lead-borate glass, tin-phosphate glass, vanadate glass, and borosilicate.
8. A method of making an organic light emitting device, the method comprising:
providing a first substrate defining a pixel region and a non-pixel region;
forming an array of organic light emitting pixels over the pixel region of the first substrate;
forming a scan driver over the non-pixel region of the first substrate;
arranging a second substrate over the first substrate such that the array being interposed between the first and second substrates;
interposing a frit comprising a plurality of elongated segments between the first substrate and second substrate and in the non-pixel region, the plurality of elongated segments in combination surrounding the array, and the plurality of elongated segments comprising a first elongated segment elongated generally in a first direction;
wherein the scan driver comprises a semiconductive integrated circuit portion and a non-semiconductive integrated circuit portion, wherein the semiconductive integrated circuit portion and the first elongated segment extend generally parallel to each other without any one of the plurality of elongated segments interposed therebetween when viewed in a second direction from the first or second substrate, wherein the second direction defines the shortest distance between the first and second substrates, and wherein the first elongated segment does not overlap with the semiconductive integrated circuit portion and overlaps with the non-semiconductive integrated circuit portion when viewed in the second direction from the first or second substrate; and
wherein the device comprises a signal line portion, wherein the signal line portion comprises a plurality of conductive lines interconnecting the scan driver and the array, wherein the signal line portion is not formed over the pixel region, wherein the first elongated segment overlaps with the signal line portion when viewed in the second direction from the first or second substrate, wherein the semiconductive integrated circuit portion has a width defined in a third direction perpendicular to the first and second directions, and wherein the semiconductive integrated circuit portion and the first elongated segment have substantially no gap in the third direction when viewed in the second direction from the first or second substrate.
9. The method of claim 8, wherein the semiconductive integrated circuit portion comprises interconnected semiconductive circuit elements.
10. The method of claim 8, wherein the semiconductive circuit elements comprise thin film transistors.
This application claims the benefit of Korean Patent Application No. 10-2006-0008766, filed on Jan. 27, 2006, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. This application is related to and incorporates herein by reference the entire contents of the following concurrently filed application:
Title Filing Date Ser. No.
ORGANIC LIGHT EMITTING Sep. 29, 2006 11/540,083
DISPLAY DEVICE AND A METHOD
OF MANUFACTURING THEREOF
The invention relates to an organic light emitting display device and a method of manufacturing the same.
Generally, an organic light emitting display device is composed of a substrate providing a pixel region and a non-pixel region. A container and a substrate are arranged to face the substrate for encapsulation and coalesced using a sealant such as epoxy.
A plurality of light emitting are elements connected between scan lines and data lines in a matrix arrangement to form a pixel region of the substrate. The light emitting elements are composed of an anode electrode; a cathode electrode; and an organic thin film layer formed between the anode electrode and the cathode electrode to generally include a hole transport layer, an organic emitting layer and an electron transport layer.
Light emitting elements configured as described above are susceptible brittle to hydrogen or oxygen to the organic substance. They are also easily oxidized by moisture in the air since the cathode electrode is formed of metallic materials, and therefore its electrical and light-emission properties are subject to deterioration. Accordingly, moisture penetrated from the outside should be removed in order to inhibit this deterioration by loading a container manufactured in a form of a metallic can or cup, and a substrate such as glass, plastic, etc. with a moisture absorbent in a powdery form or adhering the moisture absorbent, in a form of film, to the container.
However, such a method for loading a container with a moisture absorbent in a powdery form has disadvantages in that its process is complex, the material and manufacturing cost is expensive, a resulting display device is thick, and it is difficult to apply to a top emission display. Also, such methods for adhering the moisture absorbent, in a form of film, to the container has disadvantages in that it is difficult to remove moisture and mass -production is difficult due to low durability and reliability. The above discussion is simply to describe the general field of light emitting displays and is not an identification of prior art.
In order to solve the problems, various methods for encapsulating a light emitting element by forming a side wall with a frit have been disclosed.
International Patent application No. PCT/KR2002/000994 (May 24, 2002) discloses an encapsulation container having a side wall formed of a glass frit; and a method of manufacturing the same.
Korean Patent Publication No. 2001-0084380 (Sep. 6, 2001) discloses a method for encapsulating a frit frame using a laser.
Korean Patent Publication No. 2002-0051153 (Jun. 28, 2002) discloses a packaging method for encapsulating an upper substrate and a lower substrate with a frit using a laser.
An aspect of the invention provides an organic light emitting device, which may comprise: a first substrate defining a pixel region and a non-pixel region; an array of organic light emitting pixels formed over the pixel region of the first substrate; a second substrate placed over the first substrate, the array being interposed between the first and second substrates; a frit seal comprising a plurality of elongated segments interposed between the first and second substrates, the plurality of elongated segments in combination surrounding the array such that the array is encapsulated by the first substrate, the second substrate and the frit seal, the plurality of elongated segments comprising a first elongated segment elongated generally in a first direction; and a scan driver formed over the non-pixel region and comprising a semiconductive integrated circuit portion, wherein the semiconductive integrated circuit portion and the first elongated segment extend generally parallel to each other without any one of the plurality of elongated segments interposed therebetween when viewed in a second direction from the first or second substrate, wherein the second direction defines the shortest distance between the first and second substrates, and wherein the first elongated segment does not substantially overlap with the semiconductive integrated circuit portion when viewed in the second direction from the first or second substrate.
In the foregoing device, the semiconductive integrated circuit portion may comprise interconnected semiconductive circuit elements. The semiconductive circuit elements may comprise thin film transistors. The device may further comprise a planarization layer formed between the first substrate and the frit, and wherein the scan driver is substantially buried in the planarization layer. The scan driver may comprise non -semiconductive integrated circuit portion, which overlaps with the first elongated segment when viewed in the second direction from the first or second substrate. The semiconductive integrated circuit portion may have a width defined in a third direction perpendicular to the first and second directions, and wherein there may be a gap in the third direction between the semiconductive integrated circuit portion and the first elongated segment when viewed in the second direction from the first or second substrate, and wherein the gap may be smaller than about the width. The width may be from about 0.02 mm to about 0.5 mm. The gap may be smaller than about 0.2 mm. The gap may be smaller than about half the width.
Still in the foregoing device, the semiconductive integrated circuit portion and the first elongated segment may have substantially no gap in the third direction when viewed in the second direction from the first or second substrate. The device may further comprise a signal line portion, wherein the signal line portion may comprise a plurality of conductive lines interconnecting the scan driver and the array, and wherein the first elongated segment may overlap with the signal line portion when viewed in the second direction from the first or second substrate. The scan driver may comprise a routing portion interposed between the semiconductive integrated circuit portion and the signal line portion, and wherein the first elongated segment may overlap with the routing portion when viewed in the second direction from the first or second substrate. The frit seal may comprise one or more materials selected from the group consisting of magnesium oxide (MgO), calcium oxide (CaO), barium oxide (BaO), lithium oxide (Li2O), sodium oxide (Na2O), potassium oxide (K2O), boron oxide (B2O3), vanadium oxide (V2O5), zinc oxide (ZnO), tellurium oxide (TeO2), aluminum oxide (Al2O3), silicon dioxide (SiO2), lead oxide (PbO), tin oxide (SnO), phosphorous oxide (P2O5), ruthenium oxide (Ru2O), rubidium oxide (Rb2O), rhodium oxide (Rh2O), ferrite oxide (Fe2O3), copper oxide (CuO), titanium oxide (TiO2), tungsten oxide (WO3), bismuth oxide (Bi2O3), antimony oxide (Sb2O3), lead-borate glass, tin-phosphate glass, vanadate glass, and borosilicate.
Another aspect of the invention provides a method of making an organic light emitting device, which may comprise: providing a first substrate defining a pixel region and a non-pixel region; forming an array of organic light emitting pixels over the pixel region of the first substrate; forming a scan driver over the non-pixel region of the first substrate; arranging a second substrate over the first substrate such that the array being interposed between the first and second substrates; interposing a frit comprising a plurality of elongated segments between the first substrate and second substrate, the plurality of elongated segments in combination surrounding the array, and the plurality of elongated segments comprising a first elongated segment elongated generally in a first direction; and wherein the scan driver comprises a semiconductive integrated circuit portion, wherein the semiconductive integrated circuit portion and the first elongated segment extend generally parallel to each other without any one of the plurality of elongated segments interposed therebetween when viewed in a second direction from the first or second substrate, wherein the second direction defines the shortest distance between the first and second substrates, and wherein the first elongated segment does not substantially overlap with the semiconductive integrated circuit portion when viewed in the second direction from the first or second substrate.
In the foregoing method, the semiconductive integrated circuit portion may comprise interconnected semiconductive circuit elements. The semiconductive circuit elements may comprise thin film transistors. The scan driver may overlap with the first elongated segment when viewed in the second direction from the first or second substrate, The semiconductive integrated circuit portion of the scan driver may have a width defined in a third direction perpendicular to the first and second directions, wherein there may be a gap in the third direction between the semiconductive integrated circuit portion the scan driver and the first elongated segment, and wherein the gap may be smaller than about the width of the scan driver.
Aspects of the invention provide an organic light emitting display device including a first substrate divided into a pixel region and a non-pixel region, wherein an organic light emitting element composed of a first electrode, an organic thin film layer and a second electrode is formed in the pixel region and a scan driver is formed in the non-pixel region; a second substrate sealed spaced apart a predetermined distance from the pixel region and the non-pixel region of the first substrate; and a frit formed along an edge of a non-pixel region of the second substrate, wherein the frit is formed so that it can be overlapped with a region except an active area of the scan driver formed in the non-pixel region.
Other aspects of the invention provides a method for manufacturing an organic light emitting display device, including steps of forming an organic light emitting element composed of a first electrode, an organic thin film layer and a second electrode in the pixel region of the first substrate divided into a pixel region and a non-pixel region and forming a scan driver in the non-pixel region; forming a frit along an edge of a region, which corresponds to the scan driver of the non-pixel region of the first substrate, in a second substrate sealed spaced apart a predetermined distance from the first substrate; arranging the second substrate on the first substrate so that the frit formed in the second substrate can be overlapped with a region except an active area of the scan driver which is a non-pixel region of the first substrate; and adhering the first substrate to the second substrate by irradiating a laser beam to the frit in the back surface of the second substrate.
Other embodiments include an organic light emitting display device comprising a first substrate defining a pixel region and a non-pixel region, wherein an organic light emitting element comprising a first electrode, an organic thin film layer and a second electrode is formed in the pixel region and a scan driver is formed in the non-pixel region, a second substrate sealed spaced apart from the pixel region and the non-pixel region of the first substrate, and a frit formed along an edge of a non-pixel region of the second substrate, wherein the frit is formed so that it can be overlapped with a region excluding an active area of the scan driver formed in the non-pixel region.
Yet other embodiments include a method for manufacturing an organic light emitting display device, comprising providing an organic light emitting element comprising a first electrode, an organic thin film layer and a second electrode in a pixel region of the first substrate, providing a scan driver in a non-pixel region of the first substrate, forming a frit along an edge of a region corresponding to the scan driver of the non-pixel region of the first substrate on a second substrate, arranging the second substrate on the first substrate so that the frit formed on the second substrate is overlapped with a region excluding an active area of the scan driver, and adhering the first substrate to the second substrate by irradiating at least one of a laser and infrared radiation to the frit in a back surface of the second substrate.
Further embodiments include a method of making an organic light emitting device, the method comprising providing an unfinished device comprising a first substrate, an array of organic light emitting pixels formed over the first substrate, and an electrically conductive line formed over the first substrate, providing a scan driver in a non -pixel region of the first substrate, providing a second substrate, interposing a frit between the first and second substrates such that the array is interposed between the first and second substrates and such that the frit surrounds the array, arranging the second substrate on the first substrate so that the frit is overlapped with a region excluding an active area of the scan driver, and melting and resolidifying at least part of the frit so as to interconnect the unfinished device and the second substrate via the frit.
FIG. 1 is a plane view showing an organic light emitting display device according to the prior art;
FIG. 2 is a cross-sectional view taken from a line I-I′ of the FIG. 1;
FIG. 3 is a plane view showing one embodiment of an organic light emitting display device according to the invention;
FIG. 4 is a cross-sectional view taken from a line II-II′ of the FIG. 3; and
FIG. 5 is a cross-sectional view taken from a line III-III′ of the FIG. 3.
FIG. 6 is a schematic exploded view of a passive matrix type organic light emitting display device in accordance with one embodiment.
FIG. 9 is a cross-sectional view of the organic light emitting display of FIG. 8, taken along the line 9-9.
Hereinafter, various embodiments according to the invention will be described in detail with reference to the accompanying drawings. Therefore, the description proposed herein are examples for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention, as apparent to those skilled in the art.
In the illustrated embodiment, the seal 1071 has a generally rectangular cross-section. In other embodiments, however, the seal 1071 can have other various cross -sectional shapes such as a generally square cross-section, a generally trapezoidal cross-section, a cross-section with one or more rounded edges, or other configuration as indicated by the needs of a given application. To improve hermeticity, it is generally desired to increase the interfacial area where the seal 1071 directly contacts the bottom or top substrate 1002, 1061 or a layer formed thereon. In some embodiments, the shape of the seal can be designed such that the interfacial area can be increased.
FIG. 1 is a plan view showing one embodiment of an organic light emitting display device. FIG. 2 is a cross-sectional view taken from a line I-I′ of the FIG. 1. As shown in FIG. 1 and FIG. 2, the organic light emitting display device comprises a deposition substrate 10, an encapsulation substrate 20 and a frit 30. The deposition substrate 10 is a substrate including a pixel region 11 including at least one organic light emitting element. A non-pixel region 15 formed in a circumference of the pixel region 11. The encapsulation substrate 20 is adhered against a surface in which an organic light emitting element 16 of the deposition substrate 10 is formed. Drives such as a scan driver 12 and a data driver 13 are formed in the non-pixel region 15 of the deposition substrate 10, respectively.
In order to adhere the deposition substrate 10 to the encapsulation substrate 20, the frit 30 is applied along edges of the deposition substrate 10 and the encapsulation substrate 20. The frit 30 is also cured using methods such as irradiation of a laser beam or an ultraviolet ray, etc. Because the frit 30 is applied, hydrogen, oxygen, moisture, etc. that penetrate between a fine gap are obstructed since an encapsulating material is formed additionally.
In one embodiment, the organic light emitting display device has a scan driver (width about 0.4 mm) and a signal line portion (width about 0.3 mm) formed in a non-pixel region 15. A frit (width about 0.7 mm) 30 is formed in a region of a seal (width about 1.5 mm) 14 between the pixel region 11 and the non-pixel region 15. An active area of the scan driver has a width of approximately 0.15 mm, and a wiring area of the scan driver has a width of approximately 0.25 mm. The active area of the scan driver refers to a semiconductive integrated circuit portion, which creates scan signals. The signal lines refer to a plurality of conductive lines extending from the scan driver to the pixels. The wiring area of the scan driver refers to a portion of the scan driver that is located between the semiconductive integrated circuit portion and the signal lines. In the non-pixel region, a dead space region may be formed in a wide range as described above, then the organic light emitting display device would desirably have an even smaller size.
Accordingly, certain embodiments provide an organic light emitting display device capable of reducing a dead space by forming a frit so that the frit can be overlapped with one region of a scan driver; and a method of manufacturing the same.
FIG. 3 is a plan view showing one embodiment of an organic light emitting display device. As shown in FIG. 3, an organic light emitting display device is divided into a pixel region 210 and a non-pixel region 220. An organic light emitting element comprising a first electrode, an organic thin film layer and a second electrode is formed in the pixel region 210. The non-pixel region 220 includes a first substrate 200 in which a scan driver 410 is formed. A second substrate 300 is sealed and spaced apart from the pixel region 210 and the non-pixel region 220 of the first substrate 200. A frit 320 is formed in spaced gaps of the non-pixel regions of the first substrate 200 and the second substrate 300 and formed so that it can be overlapped with a region excluding an active area of the scan driver 410 of the first substrate 200.
The first substrate 200 of the organic light emitting display device defines a pixel region 210 and a non-pixel region 220 surrounding the pixel region 210. In the pixel region 210 of the first substrate 200 are formed a plurality of organic light emitting elements 100 connected between a scan line 104 b and a data line 106 c in a matrix type arrangement. In the non-pixel region 220 of the first substrate 200 are formed a scan line 104 b and a data line 106 c extending from the scan line 104 b and the data line 106 c of the pixel region 210. A power supply line (not shown) for operating an organic light emitting element 100, a scan drive unit 410 and a data drive unit 420 for treating signals, are provided from the outside through pads 104 c and 106 d, to supply the signals to the scan line 104 b and the data line 106 c.
FIG. 4 is a cross-sectional view taken from a line II-II′. As shown in FIG. 4, the organic light emitting element 100 formed in the pixel region comprises an anode electrode 108, a cathode electrode 111, and an organic thin film layer 110 formed between the anode electrode 108 and the cathode electrode 111. The organic thin film layer 110 has a structure in which a hole transport layer, an organic emitting layer and an electron transport layer are laminated, and may further include a hole injection layer and an electron injection layer. The organic thin film layer 110 may further include a switching transistor for controlling an operation of the organic light emitting diode 100, and a capacitor for sustaining signals.
Hereinafter, a process of manufacturing an organic light emitting element 100 will be described in detail, as follows. A buffer layer 101 is formed on a substrate 200 defining the pixel region 210 and non-pixel region 220. The buffer layer 101 inhibits the substrate 200 from being damaged by the heat and obstructs ions from being diffused from the substrate 200. The buffer layer comprises insulation films such as a silicon oxide film (SiO2) and/or a silicon nitride film (SiNx). A semiconductor layer 102 defining an active layer is formed in a region on the buffer layer 101 of the pixel region 210. A gate insulation film 103 is formed in the upper surface of the pixel region 210 including the semiconductor layer 102.
A gate electrode 104 a is formed on the gate insulation film 103 in the upper portion of the semiconductor layer 102. In the pixel region 210 is formed a scan line 104 b connected with the gate electrode 104 a. In the non-pixel region 220 are formed a scan line 104 b extending from the scan line 104 b of the pixel region 210 and a pad 104 c for receiving signals from the outside. The gate electrode 104 a, the scan line 104 b and the pad 104 c comprise metals such as molybdenum (Mo), tungsten (W), titanium (Ti), aluminum (Al), etc., alloys thereof, and/or are formed with a laminated structure.
An interlayer insulation film 105 is formed in upper surfaces of the pixel region 210 and the non-pixel region 220 which include the gate electrode 104 a, respectively. The interlayer insulation film 105 and the gate insulation film 103 are patterned to form a contact hole so as to expose a region of the semiconductor layer 102. A source and drain electrodes 106 a and 106 b are formed so that they can be connected with the semiconductor layer 102 through the contact hole. In the pixel region 210 is formed a data line 106 c connected with the source and drain electrodes 106 a and 106 b. In the non-pixel region 220 is formed a data line 106 c extending from the data line 106 c of the pixel region 210 and a pad 106 d for receiving signals from the outside. The source and drain electrodes 106 a and 106 b, the data line 106 c and the pad 106 d comprise metals such as molybdenum (Mo), tungsten (W), titanium (Ti), aluminum (Al), etc., alloys thereof, and/or are formed with a laminated structure.
An overcoat 107 is formed in the upper surfaces of the pixel region 210 and the non-pixel region 220 to flatten the surfaces. The overcoat 107 of the pixel region 210 is patterned to form a via hole so as to expose a region of the source or drain electrodes 106 a or 106 b. An anode electrode 108 is connected with the source or drain electrodes 106 a or 106 b through the via hole. An organic thin film layer 110 is formed on the overcoat 107 so as to expose a region of the anode electrode 108. An organic thin film layer 110 is formed on the exposed anode electrode 108. A cathode electrode 111 is formed on a pixel definition layer 109 including the organic thin film layer 110. A sealing substrate having a suitable size so that the second substrate 300 is overlapped with some regions of the pixel region 210 and the non-pixel region 220. A substrate composed of transparent materials such as glass may be used as the second substrate 300. In one embodiment, the substrate comprises silicon oxide (SiO2).
FIG. 5 is a cross-sectional view taken from a line III-III′. As shown in FIG. 5, a frit 320 for encapsulation is formed along an edge of the second substrate 300 corresponding to the non-pixel region 220. Here, the frit has a width of approximately 0.7 mm, and is formed so that it can be overlapped with a region excluding an active area of the scan driver 410.
In one embodiment, the scan driver 410 in the non-pixel region 220 includes an scan driver active area, a scan driver wiring area and a signal lines. The scan driver 410 has a width of approximately 0.7 mm, wherein the active area of the scan driver has a width of approximately 0.15 mm, the scan driver wiring area has a width of approximately 0.25 mm, and the signal line portion has a width of approximately 0.3 mm. The frit 320 is formed so that its width can be overlapped with the scan driver wiring area and the signal, line portion by widths of approximately 0.25 mm and approximately 0.3 mm, respectively.
The frit 320 is not formed in a region of a seal (1.5 mm) 430, but formed to the extent of a region excluding the active area of the scan driver. Therefore a dead space may be reduced by approximately 0.55 mm, and a dead space in another side in which another scan driver is formed is also reduced. Therefore a dead space may be reduced by the total width of approximately 1.1 mm in the both sides. The frit 320 is formed on a buffer layer 101, a gate insulation film 103, an interlayer insulation film 105 and an overcoat 107, which are extended together with the pixel region 210 and sequentially formed to the extent of the non-pixel region 220.
The frit 320 inhibits hydrogen and oxygen and moisture from penetrating by encapsulating the pixel region 210 and is formed to surround a region of the non-pixel region 220 including the pixel region 210. A reinforcing absorbent may be further formed in an edge region in which the frit 320 is formed. In one embodiment, the frit 320 comprises a powdery glass material.
A glass frit paste 320 is doped with at least one kind of a transition metal using a screen printing or dispensing method and is applied at a height of approximately 14 to 15 mm and a width of approximately 0.6 to 0.7 mm. Moisture and/or an organic binder is removed and the frit paste 320 is plasticized to cure the glass frit.
The second substrate 300 is arranged on the first substrate 200, in which the organic light emitting element 100 is formed, so that the second substrate 300 can be overlapped with at least certain regions of the pixel region 210 and the non-pixel region 220. The frit 320 is melted and adhered to the first substrate 200 by irradiating a laser along the frit 320 in the back surface of the second substrate 300. In one embodiment, the laser beam is irradiated at a power of approximately 36 to 38 W. The laser beam is scanned along the frit 320 at a substantially constant speed, for example at a speed of 10 to 30 mm/sec, preferably approximately 20 mm/sec so as to sustain a more uniform melting temperature and adhesive force. The laser beam is preferably not irradiated to patterns such as a metal line on the substrate 200 of the non-pixel region 220 corresponding to the frit 320.
In one embodiment, the frit 320 is formed to encapsulate only a pixel region 210. In another embodiment, the frit 320 is formed to encapsulate a scan drive unit 410 wherein a size of the sealing substrate 300 is varied accordingly. The first 320 can be formed in the sealing substrate 300 and may also be formed in the substrate 200. The laser can be used for melting the frit 320 and then adhering it to the substrate 200, but other power sources such as an infrared ray may be used as well.
As described above, embodiments of the invention are described in detail referring to the accompanying drawings. It should be understood that the terms used in the specification and appended claims should not be construed as limited to general and dictionary meanings, but be interpreted based on the meanings and concepts corresponding to technical aspects of the invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Therefore, the description herein is simple examples for the purpose of illustrations only, and not intended to limit the scope of the invention. It should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.
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U.S. Classification 257/100, 257/40, 313/498, 315/169.1, 313/500, 315/169.3, 313/504, 438/99, 313/506
International Classification H01L33/52, G09F9/00, H05B33/10, H01L27/32, H05B33/04, G09F9/30, H05B33/06, H01L51/50
Cooperative Classification H01L27/3276, H01L51/5246
European Classification H01L51/52C, H01L27/32M2W
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, DEUK JONG;SONG, SEUNG YONG;REEL/FRAME:018713/0554