Source: http://www.google.fr/patents/US8125146?hl=fr
Timestamp: 2013-05-24 20:35:07
Document Index: 47011496

Matched Legal Cases: ['Application No. 10', 'Application No. 200710003941', 'Application No. 07250355', 'Application No. 10', 'Application No. 2006', 'Application No. 2006', 'Application No. 2006', 'Application No. 2006', 'Application No. 096102645', 'Application No. 95145107']

Brevet US8125146 - Organic light emitting display having a second frit portion configured to ... - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus » Recherche avanc�e dans les brevets | Historique Web | Connexion Recherche avanc�e dans les brevets BrevetsAn organic light emitting display includes a first substrate including a pixel region in which organic light emitting diodes are formed and a non-pixel region formed on the outer circumference of the pixel region. A second substrate is attached to the first substrate, and a sealing is provided between...http://www.google.fr/patents/US8125146?utm_source=gb-gplus-shareBrevet US8125146 - Organic light emitting display having a second frit portion configured to melt more easily than a frit portion Num�ro de publicationUS8125146 B2Type de publicationOctroi Num�ro de demande11/541,009 Date de publication28 f�vr. 2012 Date de d�p�t29 sept. 2006 Date de priorit�27 janv. 2006Autre r�f�rence de publicationCN100524806CCN101009319AEP1814186A2EP1814186A3US20070176549 InventeursJin Woo Park Cessionnaire d'origineSamsung Mobile Display Co., Ltd.Samsung Display Co., Ltd.Samsung Sdi Co., Ltd. Classification aux �tats-Unis313/512 Classification internationaleH01J63/04H01J1/62 Classification coop�rativeH01L51/56H01L27/3281C03C8/02H01L27/3244H01L51/5237 Classification europ�enneH01L 51/52CC03C 8/02R�f�rencesCitations de brevets (114)Citations hors brevets (12) R�f�renc� par (1)Liens externesUSPTO Cession USPTO EspacenetOrganic light emitting display having a second frit portion configured to melt more easily than a frit portionUS 8125146 B2 R�sum� An organic light emitting display includes a first substrate including a pixel region in which organic light emitting diodes are formed and a non-pixel region formed on the outer circumference of the pixel region. A second substrate is attached to the first substrate, and a sealing is provided between the first substrate and the second substrate. The sealing includes a first frit layer and a second frit layer which melts substantially more easily than the first frit layer upon irradiation of a laser or infrared beam thereto.
a flat first substrate having a plate-like shape;
a flat second substrate having a plate-like shape and opposing the first substrate;
an array of organic light emitting pixels interposed between the first and second substrates; and
a stack of layers of glass frit portions, which forms a closed loop surrounding the array and interposed between the first and second substrates, wherein the stack of layers of glass frit portions comprises a first glass frit portion and a second glass frit portion, wherein the first glass frit portion is interposed between the first substrate and the second glass frit portion, and the second glass frit portion is interposed between the first glass frit portion and the second substrate, wherein the second glass frit portion comprises a material that melts substantially easier than the first glass frit portion upon irradiation of a laser or infrared beam thereto, and wherein the first glass frit portion and a surface of the first substrate contacting the first glass frit portion have different compositions,
wherein the first glass frit portion comprises a material and the second glass frit portion comprises the same material,
wherein each of the first and second glass frit portions comprises a light-to-heat conversion material configured to generate heat upon receiving the laser or infrared beam, and wherein the second glass frit portion comprises an amount of the light-to-heat conversion material substantially more than the first glass frit portion.
2. The device of claim 1, wherein the second glass frit portion comprises a light-to-heat conversion material configured to generate heat upon receiving the laser or infrared beam, and wherein the first glass frit portion is substantially free of the light-to-heat conversion material.
3. The device of claim 1, wherein the first glass frit portion is substantially transparent.
4. The device of claim 1, wherein the second glass frit portion is substantially non-transparent.
5. The device of claim 1, wherein one of the first and second glass frit portions comprises at least one selected from the group consisting of SiO2, PbO, V2O5, ZnO, B2O3, and P2O5.
6. The device of claim 1, wherein the first glass frit portion comprises a first end facing the second substrate, the second glass frit portion comprises a second end facing the first substrate, wherein the first end has a first width perpendicular to the shortest imaginary line interconnecting the first and second substrates in a plane perpendicular to an elongation of the first segment, and wherein the second end has a second width in the same direction, wherein the first width is greater than the second width.
7. The device of claim 6, wherein the second end contacts a peripheral portion of the first end along the direction.
8. The device of claim 6, wherein the second end contacts a central portion of the first end along the direction.
9. The device of claim 1, wherein the first glass frit portion comprises a first end facing the second substrate, the second glass frit portion comprises a second end facing the first substrate, wherein the first portion has a first height from the first substrate to the first end in a direction parallel to the shortest imaginary line interconnecting the first and second substrates in a plane perpendicular to an elongation of the first segment, wherein the second portion has a second height from the second substrate to the second end in the same direction, wherein the first height is greater than the second height.
10. The device of claim 1, wherein the array is formed on the second substrate, and wherein the array and the first substrate form a gap therebetween.
11. The device of claim 1, wherein the device is configured to display image through the first substrate.
12. The device of claim 1, wherein the first glass frit portion has a volume substantially greater than that of the second glass fit portion.
13. The device of claim 1, wherein the first glass frit portion is bonded to the first substrate by baking the first substrate and the first glass fit portion in contact with the first substrate.
14. The device of claim 1, wherein the second glass frit portion is bonded to the second substrate and the first glass frit portion by applying a laser or infrared light thereto.
15. The device of claim 1, further comprising at least one supplementary sealing structure extending along the first segment, wherein the at least one supplementary sealing structure is interposed between and interconnects the first and second substrates, wherein the supplementary sealing structure is located inside or outside the enclosed space.
16. The device of claim 15, wherein the supplementary sealing structure is configured to improve sealing of the enclosed space.
17. The device of claim 1, further comprising a first supplementary sealing structure and a second supplementary sealing structure, each of which is interposed between and interconnects the first and second substrates, wherein the first supplementary sealing structure extends along the first segment inside the enclosed space, and wherein the second supplementary sealing structure extends along the first segment outside the enclosed space.
18. The device of claim 1, further comprising a supplementary sealing structure extending along the first segment and located inside or outside the enclosed space, wherein the supplementary sealing structure comprises a portion interposed between and interconnects the first glass frit portion and the second substrate.
19. The device of claim 18, wherein the supplementary sealing structure comprises another portion that is not interposed between the first glass frit portion of the glass frit seal and the first substrates.
20. The device of claim 1, further comprising a first supplementary sealing structure and a second supplementary sealing structure, each of which extends along the first segment inside or outside the enclosed space, wherein the first supplementary sealing structure is interposed between and interconnects the first and second substrates, wherein the second supplementary sealing structure is interposed between and interconnects the first glass frit portion and the second substrate.
21. The device of claim 1, wherein the glass 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.
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Korean Patent Application No. 10-2006-0008761, 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 applications:
DEVICE METHOD OF FABRICATING THE SAME
The present invention relates to organic light emitting display devices and, more particularly, to packaging such devices.
Recently, organic light emitting displays that use organic light emitting diodes are spotlighted. The organic light emitting displays are spontaneous emission displays that electrically excite phosphorous organic compounds to emit light and can be driven at a low voltage, can be easily made thin, and have a wide view angle and high response speed. The organic light emitting display includes a plurality of pixels that include organic light emitting diodes that are formed on a substrate and thin film transistors (TFT) for driving the organic light emitting diodes. Since the organic light emitting diodes are sensitive to moisture, a sealing structure in which moisture is prevented from contacting the organic materials by using a metal cap coated with an absorbent or a sealing glass substrate is provided. U.S. Pat. No. 6,998,776 B2 discloses that an organic light-emitting display includes a first substrate plate, a second substrate plate and a frit connecting the plates.
SUMMARY OF CERTAIN INVENTIVE ASPECTS An aspect of the invention provides an organic light emitting display device, which may comprise: a first substrate made of a single layer or multiple layers; a second substrate made of a single layer or multiple layers and opposing the first substrate; an array of organic light emitting pixels interposed between the first and second substrates; and a fit seal comprises a plurality of elongated segments forming a closed loop surrounding the array and interposed between the first and second substrates, wherein the frit seal, the first substrate and the second substrate together define an enclosed space in which the array is located, wherein the frit seal comprises a first frit portion contacting the first substrate and a second frit portion contacting the second substrate, wherein a first one of the plurality of segments comprises the first and second frit portions, wherein the second fit portion is configured to melt substantially easier than the first fit portion upon irradiation of a laser or infrared beam thereto.
In the foregoing device, the first and second frit portions may contact each other. Each of the first and second frit portions may comprise a light-to-heat conversion material configured to generate heat upon receiving the laser or infrared beam, and wherein the second frit portion may comprise an amount of the light-to-heat conversion material substantially more than the first frit portion. The second frit portion may comprise a light-to-heat conversion material configured to generate heat upon receiving the laser or infrared beam, and wherein the first frit portion may be substantially free of the light-to-heat conversion material. The first frit portion may be substantially transparent. The second frit portion may be substantially non-transparent. One of the first and second frit portions may comprise at least one selected from the group consisting of SiO2, PbO, V2O5, ZnO, B2O3, and P2O5. The first frit portion may comprise a first end facing the second substrate, the second frit portion may comprise a second end facing the first substrate, wherein the first end may have a first width perpendicular to the shortest imaginary line interconnecting the first and second substrates in a plane perpendicular to an elongation of the first segment, and wherein the second end may have a second width in the same direction, wherein the first width may be greater than the second width. The second end may contact a peripheral portion of the first end along the direction. The second end may contact a central portion of the first end along the direction.
Still in the foregoing device, the first frit portion may comprise a first end facing the second substrate, the second frit portion may comprise a second end facing the first substrate, wherein the first portion may have a first height from the first substrate to the first end in a direction parallel to the shortest imaginary line interconnecting the first and second substrates in a plane perpendicular to an elongation of the first segment, wherein the second portion may have a second height from the second substrate to the second end in the same direction, wherein the first height may be greater than the second height. The array may be formed on the second substrate, and wherein the array and the first substrate may form a gap therebetween. The device may be configured to display image through the first substrate. The first frit portion may have a volume substantially greater than that of the second frit portion. The first frit portion may be bonded to the first substrate by baking the first substrate and the first frit portion in contact with the first substrate. The second frit portion may be bonded to the second substrate and the first frit portion by applying a laser or infrared light thereto.
Further in the foregoing device, the device may further comprise at least one supplementary structure extending along the first segment, wherein the at least one supplementary structure is interposed between and interconnects the first and second substrates, wherein the supplementary structure is located inside or outside the enclosed space. The supplementary structure may be configured to improve sealing of the enclosed space. The device may further comprise a first supplementary structure and a second supplementary structure, each of which is interposed between and interconnects the first and second substrates, wherein the first supplementary structure extends along the first segment inside the enclosed space, and wherein the second supplementary structure extends along the first segment outside the enclosed space. The device may further comprise a supplementary structure extending along the first segment and located inside or outside the enclosed space, wherein the supplementary structure comprises a portion interposed between and interconnects the first frit portion and the second substrate. The supplementary structure may comprise another portion that is not interposed between the first frit portion of the frit seal and the first substrates. The device may comprise a first supplementary structure and a second supplementary structure, each of which extends along the first segment inside or outside the enclosed space, wherein the first supplementary structure is interposed between and interconnects the first and second substrates, wherein the second supplementary structure is interposed between and interconnects the first frit portion and the 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 present invention provides an organic light emitting display, which may comprises a first substrate including a pixel region in which at least one organic light emitting diode including a first electrode, an organic layer, and a second electrode is formed and a non-pixel region formed on the outer circumference of the pixel region, a second substrate attached to one region including the pixel region of the first substrate, and a first sealing material provided between the non-pixel region of the first substrate and the second substrate. The first sealing material may comprise at least one transparent first frit layer and an opaque second frit layer.
Still another aspect of the present invention provides a method of fabricating an organic light emitting display comprising a first substrate comprising a pixel region in which at least one organic light emitting diode is formed and a non-pixel region formed on the outer circumference of the pixel region and a second substrate attached to one region including the pixel region of the first substrate, which may comprise the steps of forming a transparent first frit layer on a second substrate, sintering the first frit layer at a first temperature, forming an opaque second frit layer on one region of the first frit layer, sintering the second frit layer at a second temperature, attaching a first substrate onto the second substrate so that the pixel region is at least sealed up, and melting the first frit layer and the second frit layer provided between the second substrate and the first substrate to attach the first substrate and the second substrate to each other.
BRIEF DESCRIPTION OF THE DRAWINGS These and other features and advantages of the invention will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic plan view illustrating a second substrate employed in an organic light emitting display according to an embodiment of the present invention;
FIG. 2 is a plan view illustrating an example of the second substrate employed in the organic light emitting display according to an embodiment of the present invention;
FIG. 3 is a sectional view illustrating the organic light emitting display according to an embodiment of the present invention;
FIGS. 4 a to 4 e are sectional views illustrating a method of fabricating an organic light emitting display according to an embodiment of the present invention;
FIGS. 5 a to 5 g are sectional views illustrating a method of fabricating an organic light emitting display according to an embodiment of the present invention;
FIG. 6A is a schematic exploded view of a passive matrix type organic light emitting display device in accordance with one embodiment;
FIG. 6B is a schematic exploded view of an active matrix type organic light emitting display device in accordance with one embodiment;
FIG. 6C is a schematic top plan view of an organic light emitting display in accordance with one embodiment;
FIG. 6D is a cross-sectional view of the organic light emitting display of FIG. 6C, taken along the line d-d; and
DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings as follows.
Referring to FIG. 6B, the active matrix OLED (AMOLED) includes local driving circuits 1012 arranged between the substrate 1002 and an array of OLED pixels. An individual pixel of AMOLEDs is defined between the common cathode 1006 and an anode 1004, which is electrically isolated from other anodes. Each local driving circuit 1012 is coupled with an anode 1004 of the OLED pixels and further coupled with a data line 1016 and a scan line 1018. In embodiments, the scan lines 1018 supply scan signals that select rows of the driving circuits, and the data lines 1016 supply data signals for particular driving circuits. The data signals and scan signals stimulate the local driving circuits 1012, which excite the anodes 1004 so as to emit light from their corresponding pixels.
As noted above, in certain embodiments, the seal 1071 is formed using a frit material or simply �frit� or �glass frit,� which includes fine glass particles. The frit particles includes one or more 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, etc. In embodiments, these particles range in size from about 2 μm to about 30 μm, optionally about 5 μm to about 10 μm, although not limited only thereto. The particles can be as large as about the distance between the top and bottom substrates 1061, 1002 or any layers formed on these substrates where the frit seal 1071 contacts.
In embodiments, a frit material as a dry composition contains glass particles from about 20 to about 90 wt %, and the remaining includes fillers and/or additives. In some embodiments, the frit paste contains about 10-30 wt % organic materials and about 70-90% inorganic materials. In some embodiments, the frit paste contains about 20 wt % organic materials and about 80 wt % inorganic materials. In some embodiments, the organic materials may include about 0-30 wt % binder(s) and about 70-100 wt % solvent(s). In some embodiments, about 10 wt % is binder(s) and about 90 wt % is solvent(s) among the organic materials. In some embodiments, the inorganic materials may include about 0-10 wt % additives, about 20-40 wt % fillers and about 50-80 wt % glass powder. In some embodiments, about 0-5 wt % is additive(s), about 25-30 wt % is filler(s) and about 65-75 wt % is the glass powder among the inorganic materials.
The organic light emitting display device has a gap between the top surface of the array and the inner surface of the top substrate. Generally, the size of the gap depends on the height of the seal interconnecting two substrates. The frit seal, among other forms of sealing, allows the gap size significantly smaller than others. For example, when using the frit seal, the gap size (the distance between the array and the second substrate) can be in the order of a few μm to several hundred μm. When the gap size is in this range, dark rings called Newton rings may be formed on the display surface due to optical interference created by light incident to the display surface. More specifically, when the gap size is about or less than 10 μm, the possibility of Newton rings may increase. Thus, in packaging an organic light emitting display device with the flit seal, the configuration for avoiding Newton rings can be a design factor.
FIG. 1 is a schematic plan view illustrating a substrate employed in an organic light emitting display according to an embodiment of the present invention. As shown in FIG. 1, the organic light emitting display according to an embodiment of the present invention includes a first or bottom substrate 100, a second or top substrate 200, a first sealing material 150, a data driver 300, a scan driver 400, and a pad unit 500. The first substrate 100 includes a pixel region 100 a in which a plurality of organic light emitting diodes or pixels (not shown) having a first electrode (not shown), an organic layer (not shown), and a second electrode (not shown) is formed, and a non-pixel region 100 b formed in the outer circumference of the pixel region 100 a. The pixel region 100 a includes a plurality of scan lines S1, S2, . . . , and Sn arranged in the row direction and a plurality of data lines D1, D2, . . . , and Dm arranged in the column direction, and a plurality of pixels 50 is formed in the regions that are defined by the scan lines S1, S2, . . . , and Sn and the data lines D1, D2, . . . , and Dm. In other words, the pixel region 100 a is a region where an image is displayed by a light emitted from an organic light emitting diode, and the non-pixel region 100 b represents all of the regions excluding the pixel region 100 a on the first substrate 100.
The second substrate 200 is attached to a region of the first substrate 100 that includes the pixel region 100 a. At this time, the second substrate 200 is provided to prevent the organic light emitting diodes (not shown) formed on the pixel region 100 a on the first substrate 100 from being affected by moisture and oxygen from the outside. Therefore, the organic light emitting diode formed on the first substrate 100 is sealed by the second substrate 200. At this time, although not limited thereto, the second substrate 200 may be formed of a material selected from the group consisting of SiO2, SiNx, and SiOxNy.
The sealing material 150 is provided between the non-pixel region 100 b of the first substrate 100 and the second substrate 200. In other words, since a gap between the first substrate 100 and the second substrate 200 is sealed up by the first sealing material 150, the organic light emitting diode provided between the first substrate 100 and the second substrate 200 can be protected from moisture and oxygen. At that time, the first sealing material 150 includes at least one a transparent first frit layer (not shown) and an opaque or non-transparent second frit layer (not shown). The first frit layer and the second frit layer will be described later in detail with reference to FIGS. 5 a to 5 e. The data driver 300 is made in the form of a chip, may be mounted on the first substrate 100, and is electrically connected to a second pad Pd of the pad unit 500. The data driver 300 supplies data signals to the plurality of data lines D1, D2, . . . , and Dm. The scan driver 400 is formed on one side of the pixel region 100 a on the first substrate 100 and is electrically connected to at least one first pad Ps in the pad unit 500 by at least one scan supply line 410. The scan driver 400 sequentially supplies scan signals to the plurality of scan lines S1, S2, . . . , and Sn that extend in the pixel region 100 a. The pad unit 500 supplies driving power to the data driver 300 through a data supply line 310 and to the scan driver 400 through a scan line 410.
In the illustrated embodiment, the sealing material 150 is coated along the outer circumference of the pixel region 100 a to seal only the pixel region 100 a, although not limited thereto. The first sealing material 150 may be applied to seal the pixel region 100 a and the scan driver 400 when the scan driver 400 is built-in. In an embodiment, the size of the second substrate 200 is sufficient to include the pixel region 100 a and the scan driver 400.
FIG. 2 is a plan view illustrating an example of the second substrate employed in the organic light emitting display according to an embodiment of the present invention. As shown in FIG. 2, the second substrate 200 according to an embodiment of the present invention includes the first sealing material 150 provided along the edge thereof. The first sealing material 150 includes at least one transparent first frit layer (not shown) and at least one opaque second frit layer (not shown). At that time, the first sealing material 150 is provided to protect the organic light emitting diodes formed on the first substrate (not shown) from moisture or oxygen and to seal up between the first substrate 100 and the second substrate 200.
FIG. 3 is a sectional view illustrating the organic light emitting display according to an embodiment of the present invention. As shown in FIG. 3, the organic light emitting display according to an embodiment of the present invention includes the first substrate 100, the first sealing material 150, and the second substrate 200. The first substrate 100 includes a deposition substrate 101 and at least one organic light emitting diode formed on the deposition substrate 101. First, a buffer layer 111 is formed on the deposition substrate 101. The deposition substrate 101 is formed of glass and the buffer layer 111 is formed of an insulating material such as SiO2 and SiNx. On the other hand, the buffer layer 111 is formed to prevent the deposition substrate 101 from being damaged by factors such as heat from the outside.
A semiconductor layer 112 that includes an active layer 112 a and source/drain regions 112 b is formed on at least one region of the buffer layer 111. A gate insulation layer 113 is formed on the buffer layer 111 to include the semiconductor layer 112. A gate electrode 114 of the size corresponding to the width of an active layer 112 a is formed on one region of the gate insulation layer 113. An interlayer insulation layer 115 is formed on the gate insulation layer 113 to include the gate electrode 114. Source and drain electrodes 116 a and 116 b are formed on a predetermined region of the interlayer insulation layer 115. Each of the source and drain electrodes 116 a and 116 b is connected to one exposed region of each of the source/drain regions 112 b. A planarization layer 117 is formed on the interlayer insulation layer 115 to include the source and drain electrodes 116 a and 116 b. A first electrode 119 is formed on one region of the planarization layer 117. At this time, the first electrode 119 is connected to one exposed region of one of the source and drain electrodes 116 a and 116 b by a via hole 118. A pixel definition layer 120 including an aperture (not shown) that exposes at least one region of the first electrode 119 is formed on the planarization layer 117 to include the first electrode 119. An organic layer 121 is formed on the aperture of the pixel definition layer 120 and a second electrode layer 122 is formed on the pixel definition layer 120 to include the organic layer 121.
The second substrate 200 is attached to the first substrate 100 by the first sealing material 150 with predetermined structures interposed in order to protect the predetermined structures formed on the first substrate 100 against the oxygen and moisture from the outside. In an embodiment, the second substrate 200 is made of SiO2.
The first sealing material 150 includes a first frit layer 150 a and a second frit layer 150 b. The second frit layer 150 b melts substantially easier than the first frit layer 150 a upon irradiation of a laser or infrared beam thereto. In one embodiment, when all other conditions are the same, the composition of materials forming the second frit layer 150 b is to melt quicker than the composition of materials forming the first frit layer 150 a. For example, the time required to start the second fit layer 150 b to melt is about 10, 20, 30, 40, 50, 55, 60, 65, 70, 75, 80 or 90% of the time required to start the first frit layer 150 a to melt. In another embodiment, when all other conditions are the same, the composition of materials forming the second fit layer 150 b is to melt at a less powerful beam than the composition of materials forming the first fit layer 150 a. For example, the energy of the laser or infrared beam required to start the second frit layer 150 b to melt is about 10, 20, 30, 40, 50, 55, 60, 65, 70, 75, 80 or 90% of the energy of the beam required to start the first frit layer 150 a to melt when applied for the same period of time. In an embodiment, the first frit layer 150 a may be transparent and the second frit layer 150 b may be opaque.
The first sealing material 150 is provided between the non-pixel region 100 b of the first substrate 100 and the second substrate 200 to attach the first substrate 100 and the second substrate 200 to each other. That is, since the gap between the first substrate 100 and the second substrate 200 is sealed up by the first sealing material 150, the organic light emitting diodes that are interposed between the first substrate and the second substrate 200 are protected from moisture and oxygen. Also, the frit 150 is hardened by irradiating the laser or infrared rays onto the frit 150. At this time, the intensity of the laser radiated onto the frit 150 is in the range of about 25 W to about 60 W.
In an embodiment, when the temperature of heated glass is rapidly reduced, a frit in the form of glass powders is generated. In general, oxide powders are added to the glass powders to be used. When an organic material is added to the frit, a gel-type paste is obtained. At this time, when the gel-type paste is sintered at a predetermined temperature, the organic material is extinguished in the air and the gel-type paste is hardened so that a glass frit is obtained.
The first frit layer 150 a is formed to prevent the Newton's ring by way of increasing a gap between the first substrate 100 and the second substrate 200. Newton's rings may be concentric circles and be shown in display surfaces. The Newton's rings may be generated when the distance between the first substrate 100 and the second substrate 200 is small. Therefore, in order to prevent the Newton's ring, there is a need to increase the gap distance between the first substrate 100 and the second substrate 200 by a predetermined height. As an example for this end, there is a way of forming the first sealing material 150 disposed between the first substrate 100 and the second substrate 200 high to increase the gap distance between the first substrate 100 and the second substrate 200. In an embodiment, a width W1 of the first frit layer 150 a is from about 0.5 mm to about 1.5 mm. (See FIG. 3.)
The second frit layer 150 b includes a filler (not shown) for adjusting a thermal expansion coefficient and an absorbent (not shown) for absorbing laser and infrared rays. By doing so, the second frit layer 150 b serves as an absorbing layer of laser or infrared rays. In an embodiment, the laser or the infrared rays are irradiated to bond the first sealing material for sealing the gap between the first substrate 100 and the second substrate 200, and the laser or infrared beam is substantially absorbed by the second frit layer 150 b. In certain embodiments, the first frit layer 150 a is a component for increasing the gap distance between the first substrate 100 and the second substrate 200, and the laser or the infrared rays transmit the first frit layer 150 a and are projected to the second frit layer 150 b. The first frit layer 150 b for increasing the gap distance is provided to have a height H1 greater than a height H2 of the second frit layer 150 b. (See FIG. 3.) In an embodiment, the first frit layer 150 a has a height H1 of 5 μm to 500 μm, and the second frit layer 150 b has a height H2 of 3 μm to 100 μm, although not limited to the above.
FIGS. 4 a to 4 e are sectional views illustrating a method of fabricating an organic light emitting display according to an embodiment of the present invention. Referring to FIGS. 4 a to 4 e, in the method of fabricating an organic light emitting display, first the transparent first frit layer 150 a is formed on one region of the second substrate 200. The first frit layer 150 a, in an embodiment, is made of at least one material selected from the group consisting of SiO2, B2O3, and P2O5. Meanwhile, the first frit layer 150 a is formed to increase the gap distance between the first substrate 100 and the second substrate 200 and to prevent the Newton's ring from generating (FIG. 4 a).
After this, the first frit layer 150 a is sintered at a predetermined temperature. In an embodiment, the temperature at which the frit layer 150 a is sintered is in the range of about 300� C. to about 700� C. After sintering process of the first frit layer 150 a, the interfaces of the second substrate 200 and the first frit layer 150 a are adhered to each other (FIG. 4 b).
As a following process, an opaque second frit layer 150 b is formed on a region of the first frit layer 150 a. At this time, the second frit layer 150 b includes an absorbent (not shown) for absorbing laser or infrared rays. In an embodiment, the absorbent is one in which at least one material selected from a group consisting of SiO2, V2O5, and ZnO is added (FIG. 4 c). In an embodiment, the temperature at which the frit layer 150 a is sintered is in the range of about 300� C. to about 550� C. In other words, the process of sintering the second frit layer 150 b may be carried out at a temperature lower than that of sintering the first frit layer 150 a. After this, the first substrate 100 is connected to the second substrate 200. At this time, on the first substrate 100, at least an organic light emitting diode (not shown) including a first electrode (not shown), an organic material layer (not shown), and a second electrode (not shown) is formed, and after arranging the first substrate 100 and second substrate 200 such that the organic light emitting diodes (not sown) face the second substrate 200, the first substrate 100 is connected to the second substrate 200 (FIG. 4 d).
After that, a laser or infrared beam is irradiated to the first frit layer 150 a and the second frit layer 150 b provided between the second substrate 200 and the first substrate 100 to bond the first frit layer 150 a, the second frit layer 150 b and the first substrate 100. By doing so, devices disposed between the first substrate 100 and the second substrate 200 including the organic light emitting diode are sealed so that the devices can be protected from moisture or oxygen (FIG. 4 e).
In the illustrated embodiment, although the first sealing material 150 formed on the second substrate 200 has been described, the first sealing material 150 may be formed on the first substrate 100 in certain embodiments. In the illustrated embodiment, although, forming the second frit layer 150 b on the first frit layer 150 a has been described such that a laser or infrared beam transmits the transparent first frit layer 150 a and is irradiated to the second frit layer 150 b, the positions of the first frit layer 150 a and the second frit layer 150 b may be exchanged in certain embodiments. Further, in the illustrated embodiment, although the sealing 150 having the first frit layer 150 a and the second frit layer 150 b has been described, the sealing 150 may have layers more that two layers.
FIGS. 5 a to 5 g are sectional views illustrating a method of fabricating an organic light emitting display according to another embodiment of the present invention. Referring to FIGS. 5 a to 5 g, in the method of fabricating an organic light emitting, first the transparent first frit layer 515 a is formed on a region of a second substrate 520 to increase the gap distance between the first substrate 510 and the second substrate 520 to prevent the Newton's ring. At this time, the first frit layer 515 is made of at least one material selected from a group consisting of SiO2, B2O3, and P2O5 (FIG. 5 a). After this, the first frit layer 515 a is sintered at a predetermined temperature. In an embodiment, a temperature at which the first frit layer 515 a is sintered is in the range of about 300� C. to about 700� C. Due to the sintering process of the first frit layer 515 a, the interfaces of the second substrate 520 and the first frit layer 515 a are bonded to each other (FIG. 5 b).
As a following process, an opaque second frit layer 515 b is formed on a region of the first frit layer 515 a. In an embodiment, the second frit layer 515 b is one in which at least one material selected from a group consisting of SiO2, PbO, V2O5, and ZnO is added. After this, the second flit layer 151 b is sintered to bond the interfaces of the first frit layer 515 a and the second frit layer 515 b to each other (FIG. 5 c).
After this, a second sealing material (supplementary sealing structures) 516 as at least one resin selected from a group consisting of epoxy, acrylate, urethane acrylate, and cyanoacrylate is formed on the first frit layer 515 a. At this time, the second sealing material 516, as illustrated in the drawings, may be formed on the first frit layer 515 a to run parallel on both sides of the second frit layer 515 b along the second frit layer 515 b, may be formed to run parallel along the second frit layer 515 b inside the second frit layer 515 b on the first frit layer 515 a, or may be formed to run parallel along the second fit layer 515 b outside the second frit layer 515 b on the first frit layer 515 a. As such, the second sealing material 515 is provided at least one of the left and right sides of the second frit layer 515 b such that resistance against impact or shock is increased and adhesive force between the first substrate and the second substrate is increased.
After this, the first substrate 510 is connected to the second substrate 520. At this time, on the first substrate 510, at least an organic light emitting diode (not shown) including a first electrode (not shown), an organic material layer (not shown), and a second electrode (not shown) is formed, and after arranging the first substrate 510 and the second substrate 520 such that the organic light emitting diode (not sown) is disposed between the first substrate 510 and the second substrate 520, the first substrate 510 is connected to the second substrate 520 (FIG. 5 e).
As a following process, ultraviolet rays are irradiated to the second sealing material 516 to cure the second sealing material 516 (FIG. 5 f). After this, a laser or infrared beam is irradiated to the first frit layer 515 a and the second frit layer 515 b provided between the second substrate 520 and the first substrate 510 to bond the first frit layer 515 a, the second frit layer 515 b and the first substrate 510. By doing so, devices disposed between the first substrate 510 and the second substrate 520 including the organic light emitting diode are sealed so that the devices can be protected from moisture or oxygen (FIG. 5 g).
In the organic light emitting display device and the method of fabricating the same according to embodiments of the present invention, the Newton's ring can be prevented by adjusting the distance between a first substrate and the second substrate. Moreover, an epoxy-based second sealing material is provided as an auxiliary sealing material to reinforce the device for shock-resistance and to effectively seal the organic light emitting diode.
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