Patent Publication Number: US-2011053301-A1

Title: Thin film deposition apparatus and method of manufacturing organic light-emitting display device by using the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Korean Application No(s). 10-2009-0079768, filed Aug. 27, 2009 and 10-2010-0011481 filed Feb. 8, 2010, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     Aspects of the present invention relate to a thin film deposition apparatus and a method of manufacturing an organic light-emitting display device by using the same, and more particularly, to a thin film deposition apparatus that can be simply applied to the manufacture of large-sized display devices on a mass scale, and a method of manufacturing an organic light-emitting display device by using the thin film deposition apparatus. 
     2. Description of the Related Art 
     Organic light-emitting display devices have a larger viewing angle, better contrast characteristics, and a faster response rate than other display devices, and thus have drawn attention as a next-generation display device. 
     An organic light-emitting display device includes intermediate layers, including an emission layer disposed between a first electrode and a second electrode that are arranged opposite to each other. The electrodes and the intermediate layers may be formed via various methods, one of which is a deposition method. When an organic light-emitting display device is manufactured by using the deposition method, a fine metal mask (FMM) having the same pattern as a thin film to be formed is disposed to closely contact a substrate, and a thin film material is deposited over the FMM in order to form the thin film having the desired pattern. 
     However, the deposition method using such an FMM presents problems in manufacturing larger devices using a mother glass having a large size. In more detail, when a large mask is used in a deposition onto a large mother glass, the mask may bend due to self-gravity, thereby distorting a pattern. Such pattern distortion is not conducive for the recent trend towards high-definition patterns. 
     On the other hand, according to the conventional deposition method, a metal mask is placed on a surface of a substrate and a magnet is disposed on the other surface of the substrate in a state where edges of the substrate are fixed by an additional chuck, and thus, the metal mask may be adhered onto the surface of the substrate by the magnet. However, in the above deposition method, since the edges of the substrate are only supported, a center portion of the substrate may sag when the substrate has a large area. This sagging of the substrate becomes more severe as the substrate increases in size. 
     SUMMARY OF THE INVENTION 
     In order to address at least the drawbacks of the deposition method using a fine metal mask (FMM) and/or other issues, aspects of the present invention provide a thin film deposition apparatus that may be simply applied to produce large-sized display devices on a mass scale and that may be suitable for high-definition patterning, and a method of manufacturing an organic light-emitting display device by using the thin film deposition apparatus. 
     According to an aspect of the present invention, there is provided a thin film deposition apparatus including: an electrostatic chuck comprising a body that contacts a substrate that constitutes a deposition target and that includes a supporting surface that fixedly engages the substrate by an electrostatic force, an electrode installed in the body to generate the electrostatic force on the supporting surface, and a battery that is electrically connected to the electrode in the body; a plurality of chambers that are maintained in vacuum states; at least one thin film deposition assembly disposed in one of the plurality of chambers, separated by a predetermined distance from the substrate, and forming a thin film on the substrate supported by the electrostatic chuck; and a carrier that moves the electrostatic chuck through the chambers. 
     According to a non-limiting aspect, the battery may be formed in the body. 
     According to a non-limiting aspect, the carrier may include: a support that extends through the chambers; a movement bar that engages the support and that supports edges of the electrostatic chuck; and a driving unit disposed between the support and the movement bar to move the movement bar along the support. 
     According to a non-limiting aspect, the thin film deposition assembly may include: a deposition source that discharges a deposition material; a deposition source nozzle unit disposed at a side of the deposition source and including a plurality of deposition source nozzles arranged in a first direction; and a patterning slit sheet disposed opposite to and spaced apart from the deposition source nozzle unit and including a plurality of patterning slits arranged in a second direction perpendicular to the first direction, wherein deposition may be performed while the substrate or the thin film deposition assembly is moved relative to the other in the first direction, and the deposition source, the deposition source nozzle unit, and the patterning slit sheet may be integrally formed as one body. 
     According to a non-limiting aspect, the deposition source and the deposition source nozzle unit, and the patterning slit sheet may be integrally connected as one body by a connection member that guides flow of the deposition material. 
     According to a non-limiting aspect, the connection member may seal a space between the deposition source nozzle unit disposed at the side of the deposition source, and the patterning slit sheet. 
     According to a non-limiting aspect, the plurality of deposition source nozzles may be tilted at a predetermined angle. 
     According to a non-limiting aspect, the plurality of deposition source nozzles may include deposition source nozzles arranged in two rows disposed in the first direction, and the each of the deposition source nozzles in each of the two rows may be tilted at the predetermined angle toward a corresponding deposition source nozzle of the other of the two rows. 
     According to a non-limiting aspect, the plurality of deposition source nozzles may include deposition source nozzles arranged in two rows disposed in the first direction, the deposition source nozzles of a row located at a first side of the patterning slit sheet may be arranged to face a second side of the patterning slit sheet, and the deposition source nozzles of the other row located at the second side of the patterning slit sheet may be arranged to face the first side of the patterning slit sheet. 
     According to a non-limiting aspect, the thin film deposition assembly may include: a deposition source that discharges a deposition material; a deposition source nozzle unit disposed at a side of the deposition source and including a plurality of deposition source nozzles arranged in a first direction; a patterning slit sheet disposed opposite to the deposition source nozzle unit and including a plurality of patterning slits arranged in the first direction; and a barrier plate assembly comprising a plurality of barrier plates that are disposed between the deposition source nozzle unit and the patterning slit sheet in the first direction, and partition a space between the deposition source nozzle unit and the patterning slit sheet into a plurality of sub-deposition spaces, wherein the thin film deposition assembly may be spaced apart from the substrate, and the thin film deposition assembly or the substrate fixedly engaged onto the electrostatic chuck may be moved relative to the other. 
     According to a non-limiting aspect, the plurality of barrier plates may extend in a second direction substantially perpendicular to the first direction. 
     According to a non-limiting aspect, the barrier plate assembly may include a first barrier plate assembly including a plurality of first barrier plates, and a second barrier plate assembly including a plurality of second barrier plates. 
     According to a non-limiting aspect, each of the first barrier plates and each of the second barrier plates may extend in a second direction substantially perpendicular to the first direction. 
     According to a non-limiting aspect, the first barrier plates may be arranged to respectively correspond to the second barrier plates. 
     According to a non-limiting aspect, the deposition source and the barrier plate assembly may be spaced apart from each other. 
     According to a non-limiting aspect, the barrier plate assembly and the patterning slit sheet may be space apart from each other. 
     According to another aspect of the present invention, there is provided a method of manufacturing an organic light emitting display device, the method including: fixing a substrate that constitutes a deposition target onto an electrostatic chuck, wherein the electrostatic chuck comprises a body that contacts the substrate and that includes a supporting surface that fixedly engages the substrate by an electrostatic force, an electrode installed in the body to generate the electrostatic force on the supporting surface, and a battery that is electrically connected to the electrode in the body; transferring the electrostatic chuck on which the substrate is fixedly engaged through a plurality of chambers that are maintained in a vacuum state; and forming an organic layer on the substrate by depositing a deposition material from a thin film deposition assembly disposed in at least one of the chambers wherein the electrostatic chuck on which the substrate is disposed or the thin film deposition assembly is moved relative to the other. 
     According to a non-limiting aspect, the battery may be formed in the body. 
     According to a non-limiting aspect, the thin film deposition assembly may include: a deposition source that discharges the deposition material; a deposition source nozzle unit disposed at a side of the deposition source and including a plurality of deposition source nozzles arranged in a first direction; and a patterning slit sheet disposed opposite to and spaced apart from the deposition source nozzle unit and including a plurality of patterning slits arranged in a second direction perpendicular to the first direction, wherein the deposition source, the deposition source nozzle unit, and the patterning slit sheet may be integrally formed as one body, and the thin film deposition assembly may be spaced apart from the substrate, and the depositing of the deposition material may be performed while the substrate or the thin film deposition assembly is moved relative to the other in the first direction. 
     According to a non-limiting aspect, the thin film deposition assembly may include: a deposition source that discharges the deposition material; a deposition source nozzle unit disposed at a side of the deposition source and including a plurality of deposition source nozzles arranged in a first direction; a patterning slit sheet disposed opposite to and spaced apart from the deposition source nozzle unit and including a plurality of patterning slits arranged in the first direction; and a barrier plate assembly comprising a plurality of barrier plates that are disposed between the deposition source nozzle unit and the patterning slit sheet in the first direction, and that partition a space between the deposition source nozzle unit and the patterning slit sheet into a plurality of sub-deposition spaces, wherein the thin film deposition assembly may be separated from the substrate, and the depositing of the deposition material may be performed while the substrate or the thin film deposition assembly is moved relative to the other. 
     According to another embodiment of the present invention, there is provided a thin film deposition apparatus including a loading unit that fixes a substrate on which a deposition material is to be deposited onto an electrostatic chuck, wherein the electrostatic chuck includes a body that contacts the substrate and that includes a supporting surface that fixedly engages the substrate by an electrostatic force, an electrode installed in the body to generate the electrostatic force on the supporting surface, and a battery that is electrically connected to the electrode in the body; a deposition unit including one or more chambers and at least one thin film deposition assembly disposed in the one or more chambers to deposit a deposition material on the substrate fixed on the electrostatic chuck; an unloading unit that removes the substrate on which deposition has been performed from the electrostatic chuck; a first circulating unit including a first carrier that sequentially moves the electrostatic chuck from the loading unit through the one or more chambers of the deposition unit, and from the deposition unit to the unloading unit; and a second circulating unit including a second carrier that returns the electrostatic chuck from which the substrate has been removed by the unloading unit, to the loading unit. 
     Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a schematic view of a thin film deposition apparatus according to an embodiment of the present invention; 
         FIG. 2  illustrates a modified example of the thin film deposition apparatus of  FIG. 1 ; 
         FIG. 3  is a schematic view of an electrostatic chuck according to an embodiment of the present invention; 
         FIG. 4  is a schematic view of an electrostatic chuck according to another embodiment of the present invention; 
         FIG. 5  is a cross-sectional view of a first circular unit according to an embodiment of the present invention; 
         FIG. 6  is a cross-sectional view of a second circular unit according to an embodiment of the present invention; 
         FIG. 7  is a perspective view of a thin film deposition assembly according to an embodiment of the present invention; 
         FIG. 8  is a schematic cross-sectional side view of the thin film deposition assembly of  FIG. 7 , according to an embodiment of the present invention; 
         FIG. 9  is a schematic cross-sectional plan view of the thin film deposition assembly of  FIG. 7 , according to an embodiment of the present invention; 
         FIG. 10  is a perspective view of a thin film deposition assembly according to another embodiment of the present invention; 
         FIG. 11  is a perspective view of a thin film deposition assembly according to another embodiment of the present invention; 
         FIG. 12  is a perspective view of a thin film deposition assembly according to another embodiment of the present invention; 
         FIG. 13  is a schematic cross-sectional side view of the thin film deposition assembly of  FIG. 12 , according to an embodiment of the present invention; 
         FIG. 14  is a schematic cross-sectional plan view of the thin film deposition assembly of  FIG. 12 , according to an embodiment of the present invention; 
         FIG. 15  is a perspective view of a thin film deposition assembly according to another embodiment of the present invention; and 
         FIG. 16  is a cross-sectional view of an organic light-emitting display device manufactured by using a thin film deposition assembly, according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain aspects of the present invention by referring to the figures 
       FIG. 1  is a schematic perspective view of a thin film deposition apparatus according to an embodiment of the present invention.  FIG. 2  illustrates a modified example of the thin film deposition apparatus of  FIG. 1 .  FIG. 3  is a view of an example of an electrostatic chuck  600 . 
     Referring to  FIG. 1 , the thin film deposition apparatus according to the current embodiment includes a loading unit  710 , a deposition unit  730 , an unloading unit  720 , a first circulating unit  610  and a second circulating unit  620 . 
     The loading unit  710  may include a first rack  712 , a transport robot  714 , a transport chamber  716 , and a first inversion chamber  718 . 
     A plurality of substrates  500  onto which a deposition material has not yet been applied are stacked up on the first rack  712 . The transport robot  714  picks up one of the substrates  500  from the first rack  712 , disposes it on the electrostatic chuck  600  transferred by the second circulating unit  620 , and moves the electrostatic chuck  600  on which the substrate  500  is disposed into the transport chamber  716 . Although it is not shown in  FIGS. 1 and 2 , the transport robot  714  may be disposed in a chamber that has an appropriate degree of vacuum maintained therein. 
     The first inversion chamber  718  is disposed adjacent to the transport chamber  716 . The first inversion chamber  718  includes a first inversion robot  719  that inverts the electrostatic chuck  600  and then loads it into the first circulating unit  610  of the deposition unit  730 . 
     The electrostatic chuck  600  according to the current embodiment of the present invention includes an electrode  602  to which an electric power is applied in a main body  601  formed of a dielectric material, as shown in  FIG. 3 . The electrode  602  is separated by a predetermined distance from a supporting surface  603  that faces the substrate  500 , and an electrostatic force is applied to the supporting surface  603  from the electrode  602  to adhere and fix the substrate  500  thereon. 
     The main body  601  includes a predetermined space in which a battery  605  is installed. The battery  605  is electrically connected to the electrode  602  to apply electric power to the electrode  602 . 
     A cover  601   a  is installed on an opposite surface of the supporting surface  603  so that the battery  605  may be inserted into or removed from the main body  601 . 
     In the electrostatic chuck  600 , an additional power line is not necessary since the power is applied to the electrode  602  from the battery  605  that is installed in the main body  601 . Therefore, it is easy to move the electrostatic chuck  600  that supports the substrate  500  in the chamber or between chambers, and it is easy to provide a thin film deposition apparatus. 
     As shown in  FIG. 4 , the battery  605  may be installed on an outer portion of the main body  601 . In this case, since the battery  605  is exposed to a deposition environment in the chamber, an additional case for covering the battery  605  may be formed. 
     Referring to  FIG. 1 , the transport robot  714  places one of the substrates  500  on the surface of the electrostatic chuck  600 , and the electrostatic chuck  600  on which the substrate  500  is disposed is loaded into the transport chamber  716 . The first inversion robot  719  inverts the electrostatic chuck  600  so that the substrate  500  is turned upside down in the deposition unit  730 . In more detail, the electrostatic chuck  600  is inverted so that the substrate  500  will face the thin film deposition assemblies  100 ,  200 ,  300 , and  400  when the electrostatic chuck  600  and substrate pass through the deposition unit  730 , to be described later. The transport chamber  716  and the first inversion chamber  718  may have an appropriate degree of vacuum maintained therein. 
     The unloading unit  720  is constituted to operate in an opposite manner to the loading unit  710  described above. Specifically, a second inversion robot  729  in a second inversion chamber  728  inverts the electrostatic chuck  600 , which has passed through the deposition unit  730  while the substrate  500  is disposed on the electrostatic chuck  600 , and then moves the electrostatic chuck  600  on which the substrate  500  is disposed into an ejection chamber  726 . Then, an ejection robot  724  removes the electrostatic chuck  600  on which the substrate  500  is disposed from the ejection chamber  726 , separates the substrate  500  from the electrostatic chuck  600 , and then loads the substrate  500  into the second rack  722 . The electrostatic chuck  600  separated from the substrate  500  is returned back into the loading unit  710  via the second circulating unit  620 . The second inversion chamber  728  and the ejection chamber  726  may have an appropriate degree of vacuum maintained therein. In addition, although it is not shown in the drawings, the ejection robot  724  may be disposed in a chamber that has an appropriate degree of vacuum maintained therein. 
     However, the present invention is not limited to the above description. For example, when disposing the substrate  500  on the electrostatic chuck  600 , the substrate  500  may be fixed onto a bottom surface of the electrostatic chuck  600  and then moved into the deposition unit  730 . (In  FIGS. 1 and 2 , terms such as “top surface” and “bottom surface” are with reference to a “top surface” being a surface facing the viewer in  FIGS. 1 and 2  and “a bottom surface” as being a surface facing away from the viewer.) In this case, for example, the first inversion chamber  718  and the first inversion robot  719 , and the second inversion chamber  728  and the second inversion robot  729  are not required. 
     The deposition unit  730  includes at least one deposition chamber. As illustrated in  FIG. 1 , the deposition unit  730  may include a first chamber  731 . As a non-limiting example, first to fourth thin film deposition assemblies  100 ,  200 ,  300 , and  400  may be disposed in the first chamber  731 . Although  FIG. 1  illustrates that a total of four thin film deposition assemblies, i.e., the first to fourth thin film deposition assemblies  100  to  400 , are installed in the first chamber  731 , the total number of thin film deposition assemblies that may be installed in the first chamber  731  may vary according to a deposition material and deposition conditions. The first chamber  731  is maintained in a vacuum state during a deposition process. 
     In the thin film deposition apparatus illustrated in  FIG. 2 , a deposition unit  730  may include a first chamber  731  and a second chamber  732  that are connected to each other. In this case, first and second thin film deposition assemblies  100  and  200  may be disposed in the first chamber  731 , and third and fourth thin film deposition assemblies  300  and  400  may be disposed in the second chamber  732 . In this regard, the number of chambers may be increased. 
     In the embodiment illustrated in  FIG. 1 , the electrostatic chuck  600  on which the substrate  500  is disposed may be moved at least to the deposition unit  730  or may be moved sequentially to the loading unit  710 , the deposition unit  730 , and the unloading unit  720 , by the first circulating unit  610 . The electrostatic chuck  600  that is separated from the substrate  500  in the unloading unit  720  is moved back to the loading unit  710  by the second circulating unit  620 . 
       FIG. 5  is a cross-sectional view of the first circulating unit  610 , according to an embodiment of the present invention. 
     The first circulating unit  610  includes a first carrier  611  that moves the electrostatic chuck  600  on which the substrate  500  is disposed. 
     The first carrier  611  includes a first support  613 , a second support  614 , a movement bar  615 , and a first driving unit  616 . 
     The first support  613  and the second support  614  are installed to extend through a chamber in the deposition unit  730 , for example, the first chamber  731  in the embodiment shown in  FIG. 1 , and the first chamber  731  and the second chamber  732  in the embodiment shown in  FIG. 2 . 
     The first support  613  is disposed vertically in the first chamber  731 , and the second support  614  is horizontally disposed below the first support  613  in the first chamber  731 . (In  FIGS. 5 and 6 , the term “vertically” refers to a direction between a thin film deposition assembly, such as thin film deposition assembly  100 , and the substrate  500  and “horizontally” refers to a direction perpendicular to such vertical direction and perpendicular to a direction of motion of the substrate through the deposition unit  730 . In more detail, the vertical direction and the horizontal direction in  FIGS. 5 and 6  correspond to the Z direction and the X direction, respectively, as shown in  FIGS. 7 to 15 . As illustrated in  FIG. 5 , the first support  613  and the second support  614  may be disposed perpendicular to each other forming a bent structure. However, the present invention is not limited to this structure, and the first support  613  and the second support  614  may have any structure, provided that the first support  613  is disposed above the second support  614 . 
     The movement bar  615  is movable along the first support  613 . One end of the movement bar  615  is supported by the first support  613 , and the other end of the movement bar  615  supports an edge of the electrostatic chuck  600 . The electrostatic chuck  600  is supported by the movement bar  615  and the electrostatic chuck  600  and the movement bar  615  together are movable along the first support  613 . A portion of the movement bar  615  supporting the electrostatic chuck  600  is bent toward the thin film deposition assembly  100 , and thus can reduce the distance between the substrate  500  and the thin film deposition assembly  100 . 
     The first driving unit  616  is disposed between the movement bar  615  and the first support  613  and moves the movement bar  615  along the first support  613 . The first driving unit  616  may include a roller  617  rolling along the first support  613 . In this regard, the first support  613  may be in the form of a rail extending in a direction perpendicular to the X and Z directions as described above, or in other words, in a direction perpendicular to the plane of the cross-sectional view of  FIG. 5 . The first driving unit  616  may generate a driving force by itself or may transfer a driving force generated by a separate driving source to the movement bar  615 . The first driving unit  616  may include any driving element, in addition to the roller  617 , provided that it can move the movement bar  615 . 
       FIG. 6  is a cross-sectional view of the second circulating unit  620 , according to an embodiment of the present invention. 
     The second circulating unit  620  includes a second carrier  621  that moves the electrostatic chuck  600  from which the substrate  500  is separated. 
     The second carrier  621  includes a first support  623 , the movement bar  615 , and the first driving unit  616 . 
     The third support  623  extends in a similar manner to the first support  613  of the first carrier  611 . The third support  623  supports the movement bar  615  having the first driving unit  616 , and the electrostatic chuck  600  that has been separated from the substrate  500  is mounted on the movement bar  615 . Structures of the movement bar  615  and the first driving unit  616  have already been described above, and thus descriptions thereof will not be provided here. 
     The system for moving the electrostatic chuck  600  is not limited to the above embodiment, and the electrostatic chuck  600  may be simply moved along a rail by using an additional roller or a chain system. 
     Hereinafter, an embodiment of the thin film deposition assembly  100  disposed in the first chamber  731  will be described. 
       FIG. 7  is a schematic perspective view of a thin film deposition assembly  100  according to an embodiment of the present invention,  FIG. 8  is a schematic side view of the thin film deposition apparatus  100 , and  FIG. 9  is a schematic plan view of the thin film deposition apparatus  100 . 
     Referring to  FIGS. 7 through 9 , the thin film deposition assembly  100  according to the current embodiment of the present invention includes a deposition source  110 , a deposition source nozzle unit  120 , and a patterning slit sheet  150 . 
     In particular, in order to deposit a deposition material  115  that is emitted from the deposition source  110  and is discharged through the deposition source nozzle unit  120  and the patterning slit sheet  150 , onto a substrate  500  in a desired pattern, it is desirable to maintain the first chamber  731  in a high-vacuum state as in a deposition method using a fine metal mask (FMM). In addition, the temperature of the patterning slit sheet  150  should be sufficiently lower than the temperature of the deposition source  110 . In this regard, the temperature of the patterning slit sheet  150  may be about 100° C. or less. The temperature of the patterning slit sheet  150  should be sufficiently low so as to reduce thermal expansion of the patterning slit sheet  150 . 
     The substrate  500 , which constitutes a deposition target on which a deposition material  115  is to be deposited, is disposed in the first chamber  731 . The substrate  500  may be a substrate for flat panel displays. A large substrate, such as a mother glass, for manufacturing a plurality of flat panel displays, may be used as the substrate  400 . Other substrates may also be employed. The substrate  500  may be affixed to the electrostatic chuck  600  as described above. 
     In the current embodiment of the present invention, deposition may be performed while the substrate  500  or the thin film deposition assembly  100  is moved relative to the other. Herein, where it is stated that the substrate or thin film deposition assembly are moved relative to the other, it is to be understood that such statement encompasses an embodiment in which only the substrate is moved and the thin film deposition assembly remains stationary, an embodiment in which only the thin film deposition assembly is moved and the substrate remains stationary and an embodiment in which both the thin film deposition assembly and the substrate are moved. 
     In particular, in the conventional FMM deposition method, the size of the FMM has to be equal to the size of a substrate. Thus, the size of the FMM has to be increased when larger substrates are used. However, it is difficult to manufacture a large FMM and to extend an FMM to be accurately aligned with a pattern. 
     In order to overcome this problem, in the thin film deposition assembly  100  according to the current embodiment of the present invention, deposition may be performed while the thin film deposition assembly  100  or the substrate  500  is moved relative to the other. In more detail, deposition may be continuously performed while the substrate  500 , which is disposed to face the thin film deposition assembly  100 , is moved in a Y-axis direction. In other words, deposition is performed in a scanning manner while the substrate  500  is moved in a direction of arrow A in  FIG. 7 . 
     In the thin film deposition assembly  100  according to the current embodiment of the present invention, the patterning slit sheet  150  may be significantly smaller than an FMM used in a conventional deposition method. In more detail, in the thin film deposition assembly  100  according to the current embodiment of the present invention, deposition is continuously performed, i.e., in a scanning manner, while the substrate  500  is moved in the Y-axis direction. Thus, lengths of the patterning slit sheet  950  in the X-axis and Y-axis directions may be significantly less than the lengths of the substrate  500  in the X-axis and Y-axis directions. As described above, since the patterning slit sheet  150  may be formed to be significantly smaller than an FMM used in a conventional deposition method, it is relatively easy to manufacture the patterning slit sheet  150  used in aspects of the present invention. In other words, using the patterning slit sheet  150 , which is smaller than an FMM used in a conventional deposition method, is more convenient in all processes, including etching and other subsequent processes, such as precise extension, welding, moving, and cleaning processes, compared using a larger FMM according to the conventional deposition method. Accordingly, the use of the patterning slit sheet  150  is more advantageous than the use of a conventional FMM for manufacturing a relatively large display device. 
     The deposition source  110 , which contains and heats the deposition material  115 , is disposed in an opposite side of the thin film deposition assembly  100  from a side in which the substrate  500  is disposed. When the deposition material  115  contained in the deposition source  110  is vaporized, the deposition material  115  is deposited on the substrate  500 . 
     In particular, the deposition source  110  includes a crucible  112  that is filled with the deposition material  115 , and a heater (not shown) that heats the crucible  112  to vaporize the deposition material  115  that is contained in the crucible  112 , such that the deposition material  115  is directed towards the deposition source nozzle unit  120 . The cooling block  111  prevents the radiation of heat from the crucible  112  to the outside, i.e., into the first chamber  731 . The heater may be incorporated in the cooling block  111 . 
     The deposition source nozzle unit  120  is disposed at a side of the deposition source  110 , and in particular, at the side of the deposition source  110  facing the substrate  500 . The deposition source nozzle unit  120  includes a plurality of deposition source nozzles  121  arranged at equal intervals in the Y-axis direction, i.e., a scanning direction of the substrate  500 . The deposition material  115  that is vaporized in the deposition source  110 , passes through the deposition source nozzle unit  120  towards the substrate  500 . As described above, when the deposition source nozzle unit  120  includes the plurality of deposition source nozzles  121  arranged in the Y-axis direction, that is, the scanning direction of the substrate  500 , the size of a pattern formed of the deposition material discharged through the patterning slits  151  of the patterning slit sheet  150  is affected by the size of each of the deposition source nozzles  121  (since there is only one line of deposition nozzles in the X-axis direction), and thus no shadow zone may be formed on the substrate  500 . In addition, since the plurality of deposition source nozzles  121  are arranged in the scanning direction of the substrate  500 , even if there is a difference in flux between the deposition source nozzles  121 , the difference may be compensated for and deposition uniformity may be maintained constant. 
     The patterning slit sheet  150  and a frame  155  in which the patterning slit sheet  150  is bound are disposed between the deposition source  110  and the substrate  500 . The frame  155  may be formed in a lattice shape, similar to a window frame. The patterning slit sheet  150  is bound inside the frame  155 . The patterning slit sheet  150  includes a plurality of patterning slits  151  arranged in the X-axis direction. The deposition material  115  that is vaporized in the deposition source  110 , passes through the deposition source nozzle unit  120  and the patterning slit sheet  150  towards the substrate  500 . The patterning slit sheet  150  may be manufactured by etching, which is the same method as used in a conventional method of manufacturing an FMM, and in particular, a striped FMM. In this regard, the total number of patterning slits  151  may be greater than the total number of deposition source nozzles  121 . 
     In addition, the deposition source  110  and the deposition source nozzle unit  120  coupled to the deposition source  110  may be disposed to be spaced apart from the patterning slit sheet  150  by a predetermined distance. Alternatively, the deposition source  110  and the deposition source nozzle unit  120  coupled to the deposition source  110  may be connected to the patterning slit sheet  150  by a first connection member  135 . That is, the deposition source  110 , the deposition source nozzle unit  120 , and the patterning slit sheet  150  may be integrally formed as one body by being connected to each other via the first connection member  135 . The first connection member  135  guides the deposition material  121 , which is discharged through the deposition source nozzles  921 , to move straight, not to deviate in the X-axis direction. In  FIG. 7 , the first connection members  135  are formed on left and right sides of the deposition source  110 , the deposition source nozzle unit  120 , and the patterning slit sheet  150  to guide the deposition material  115  not to deviate in the X-axis direction; however, aspects of the present invention are not limited thereto. That is, the first connection member  135  may be formed as a sealed box to guide flow of the deposition material  915  both in the X-axis and Y-axis directions. 
     As described above, the thin film deposition assembly  100  according to the current embodiment of the present invention performs deposition while being moved relative to the substrate  500 . In order to move the thin film deposition assembly  100  relative to the substrate  500 , the patterning slit sheet  150  is spaced apart from the substrate  500  by a predetermined distance. 
     In particular, in a conventional deposition method using an FMM, deposition is performed with the FMM in close contact with a substrate in order to prevent formation of a shadow zone on the substrate. However, when the FMM is used in close contact with the substrate, the contact may cause defects. In addition, in the conventional deposition method, the size of the mask has to be the same as the size of the substrate since the mask cannot be moved relative to the substrate. Thus, the size of the mask has to be increased as display devices become larger. However, it is not easy to manufacture such a large mask. 
     In order to overcome this problem, in the thin film deposition assembly  100  according to the current embodiment of the present invention, the patterning slit sheet  150  is disposed to be spaced apart from the substrate  500  by a predetermined distance. 
     As described above, according to aspects of the present invention, a mask is formed to be smaller than a substrate, and deposition is performed while the mask is moved relative to the substrate. Thus, the mask can be easily manufactured. In addition, defects caused due to the contact between a substrate and an FMM, which occur in the conventional deposition method, may be prevented. Furthermore, since it is unnecessary to dispose the FMM in close contact with the substrate during a deposition process, the manufacturing time may be reduced. 
       FIG. 10  is a perspective view of a thin film deposition assembly according to another embodiment of the present invention. Referring to  FIG. 10 , the thin film deposition assembly  100  according to the current embodiment of the present invention includes a deposition source  110 , a deposition source nozzle unit  120 , and a patterning slit sheet  150 . In particular, the deposition source  110  includes a crucible  112  that is filled with the deposition material  115 , and a cooling block  111  including a heater that heats the crucible  112  to vaporize the deposition material  115  that is contained in the crucible  112 , so as to move the vaporized deposition material  115  to the deposition source nozzle unit  120 . The deposition source nozzle unit  120 , which has a planar shape, is disposed at a side of the deposition source  110 . The deposition source nozzle unit  120  includes a plurality of deposition source nozzles  121  arranged in the Y-axis direction. The patterning slit sheet  150  and a frame  155  are further disposed between the deposition source  110  and the substrate  500 . The patterning slit sheet  150  includes a plurality of patterning slits  151  arranged in the X-axis direction. In addition, the deposition source  110  and the deposition source nozzle unit  120  may be connected to the patterning slit sheet  150  by the second connection member  133 . 
     In the current embodiment, a plurality of deposition source nozzles  121  formed on the deposition source nozzle unit  120  are tilted at a predetermined angle, unlike the thin film deposition assembly described with reference to  FIGS. 7 to 9 . In particular, the deposition source nozzles  121  may include deposition source nozzles  121   a  and  121   b  arranged in respective rows. The deposition source nozzles  121   a  and  121   b  may be arranged in respective rows to alternate in a zigzag pattern. The deposition source nozzles  121   a  and  121   b  may be tilted at a predetermined angle on an XZ plane. 
     In the current embodiment of the present invention, the deposition source nozzles  121   a  and  121   b  are arranged to tilt at a predetermined angle toward each other. The deposition source nozzles  121   a  in a first row and the deposition source nozzles  121   b  in a second row may tilt at the predetermined angle to face each other. That is, the deposition source nozzles  121   a  of the first row in a left part of the deposition source nozzle unit  120  may tilt to face a right side portion of the patterning slit sheet  150 , and the deposition source nozzles  121   b  of the second row in a right part of the deposition source nozzle unit  120  may tilt to face a left side portion of the patterning slit sheet  150 . 
     Due to the structure of the thin film deposition assembly  100  according to the current embodiment, the deposition of the deposition material  115  may be adjusted to lessen a thickness variation between the center and the end portions of the substrate  500  and improve thickness uniformity of the deposition film. Moreover, utilization efficiency of the deposition material  115  may also be improved. 
       FIG. 11  is a perspective view of a thin film deposition apparatus according to another embodiment of the present invention. Referring to  FIG. 11 , the thin film deposition apparatus according to the current embodiment of the present invention includes a plurality of thin film deposition assemblies  100 ,  200 ,  300 , each of which has the structure of the thin film deposition assembly  100  illustrated in  FIGS. 7 through 9 . In other words, the thin film deposition apparatus according to the current embodiment of the present invention may include a multi-deposition source that simultaneously discharges deposition materials for forming an R emission layer, a G emission layer, and a B emission layer. 
     In particular, the thin film deposition apparatus according to the current embodiment of the present invention includes a first thin film deposition assembly  100 , a second thin film deposition assembly  200 , and a third thin film deposition assembly  300 . Each of the first thin film deposition assembly  100 , the second thin film deposition assembly  200 , and the third thin film deposition assembly  300  has the same structure as the thin film deposition assembly described with reference to  FIGS. 7 through 9 , and thus a detailed description thereof will not be repeated here. 
     The deposition sources  110  of the first thin film deposition assembly  100 , the second thin film deposition assembly  200  and the third thin film deposition assembly  300  may contain different deposition materials, respectively. The first thin film deposition assembly  100  may contain a deposition material for forming the R emission layer, the second thin film deposition assembly  200  may contain a deposition material for forming the G emission layer, and the third thin film deposition assembly  300  may contain a deposition material for forming the B emission layer. 
     In other words, in a conventional method of manufacturing an organic light-emitting display device, a separate chamber and mask are used to form each color emission layer. However, when the thin film deposition apparatus according to the current embodiment of the present invention is used, the R emission layer, the G emission layer and the B emission layer may be formed at the same time with a single multi-deposition source. Thus, the time it takes to manufacture the organic light-emitting display device is sharply reduced. In addition, the organic light-emitting display device may be manufactured with a reduced number of chambers, so that equipment costs are also markedly reduced. 
     Although not illustrated, a patterning slit sheet of the first thin film deposition assembly  100 , a patterning slit sheet of the second thin film deposition assembly  200 , a patterning slit sheet of the third thin film deposition assembly  300  may be arranged to be offset by a constant distance with respect to each other, in order for deposition regions corresponding to the patterning slit sheets  150 ,  250  and  350  not to overlap on the substrate  400 . In other words, when the first thin film deposition assembly  100 , the second thin film deposition assembly  200 , and the third thin film deposition assembly  200  are used to deposit the R emission layer, the G emission layer and the B emission layer, respectively, patterning slits  151  of the first thin film deposition assembly  100 , patterning slits  251  of the second thin film deposition assembly  200 , and patterning slits  351  of the second thin film deposition assembly  300  are arranged not to be aligned with respect to each other, in order to form the R emission layer, the G emission layer and the B emission layer in different regions of the substrate  500 . 
     In addition, the deposition materials for forming the R emission layer, the G emission layer, and the B emission layer may have different deposition temperatures. Therefore, the temperatures of the deposition sources of the respective first, second, and third thin film deposition assemblies  100 ,  200 , and  300  may be set to be different. 
     Although the thin film deposition apparatus according to the current embodiment of the present invention includes three thin film deposition assemblies, the present invention is not limited thereto. In other words, a thin film deposition apparatus according to another embodiment of the present invention may include a plurality of thin film deposition assemblies, each of which contains a different deposition material. For example, a thin film deposition apparatus according to another embodiment of the present invention may include five thin film deposition assemblies respectively containing materials for an R emission layer, a G emission layer, a B emission layer, an auxiliary layer (R′) of the R emission layer, and an auxiliary layer (G′) of the G emission layer. Moreover, thin film deposition assemblies  100 ,  200 ,  300  may be located in a single deposition chamber  731  as shown in  FIG. 1  or in separate deposition chambers  731  and  732  housed in a single deposition unit  730  as shown in  FIG. 2  through which a circulating unit  610  conveys an electrostatic chuck  600  to which a substrate  500  is affixed. 
     As described above, a plurality of thin films may be formed at the same time with a plurality of thin film deposition assemblies, and thus manufacturing yield and deposition efficiency are improved. In addition, the overall manufacturing process is simplified, and the manufacturing costs are reduced. 
       FIG. 12  is a schematic perspective view of a thin film deposition assembly  100  according to an embodiment of the present invention,  FIG. 13  is a schematic cross-sectional side view of the thin film deposition assembly  100  of  FIG. 12 , and  FIG. 14  is a schematic cross-sectional plan view of the thin film deposition assembly  100  of  FIG. 12 . 
     Referring to  FIGS. 12 through 14 , the thin film deposition assembly  100  according to the current embodiment of the present invention includes a deposition source  110 , a deposition source nozzle unit  120 , a barrier plate assembly  130 , and patterning slits  151 . 
     Although a chamber is not illustrated in  FIGS. 12 through 14  for convenience of explanation, all the components of the thin film deposition assembly  100  may be disposed within a chamber that is maintained at an appropriate degree of vacuum. The chamber is maintained at an appropriate vacuum in order to allow a deposition material to move in a substantially straight line through the thin film deposition apparatus  100 . 
     In the chamber in which the thin film deposition assembly  100  is disposed, the substrate  500 , which constitutes a deposition target on which the deposition material  115  is to be deposited, is transferred by the electrostatic chuck  600 . The substrate  500  may be a substrate for flat panel displays. A large substrate, such as a mother glass, for manufacturing a plurality of flat panel displays, may be used as the substrate  500 . Other substrates may also be employed. 
     In an embodiment, the substrate  500  or the thin film deposition assembly  100  may be moved relative to the other. For example, as illustrated in  FIG. 12 , the substrate  500  may be moved in a direction of an arrow A, relative to the thin film deposition assembly  100 . 
     In the thin film deposition assembly  100  according to the current embodiment of the present invention, the patterning slit sheet  150  may be significantly smaller than an FMM used in a conventional deposition method. In other words, in the thin film deposition assembly  100 , deposition is continuously performed, i.e., in a scanning manner, while the substrate  500  is moved in the Y-axis direction. Thus, a length of the patterning slit sheet  150  in the Y-axis direction may be significantly less than a length of the substrate  500  in the Y-axis direction. A width of the patterning slit sheet  150  in the X-axis direction and a width of the substrate  500  in the X-axis direction may be substantially equal to each other. However, even when the width of the patterning slit sheet  150  in the X-axis direction is less than the width of the substrate  500  in the X-axis direction, deposition may be performed on the entire substrate  500  in a scanning manner while the substrate  500  or the thin film deposition assembly  100  is moved relative each other. 
     As described above, since the patterning slit sheet  150  may be formed to be significantly smaller than an FMM used in a conventional deposition method, it is relatively easy to manufacture the patterning slit sheet  150  used in aspects of the present invention. In other words, using the patterning slit sheet  150 , which is smaller than an FMM used in a conventional deposition method, is more convenient in all processes, including etching and other subsequent processes, such as precise extension, welding, moving, and cleaning processes, compared to the conventional deposition method using the larger FMM. Accordingly, the use of the patterning slit sheet  150  is more advantageous than the use of a conventional FMM for manufacturing a relatively large display device. 
     The deposition source  110  that contains and heats the deposition material  115  is disposed in an opposite side of the first chamber from the side in which the substrate  500  is disposed. 
     The deposition source  110  includes a crucible  112  that is filled with the deposition material  115 , and a cooling block  111  surrounding the crucible  112 . The cooling block  111  prevents radiation of heat from the crucible  112  outside, i.e., into the first chamber. The cooling block  111  may include a heater (not shown) that heats the crucible  111 . 
     The deposition source nozzle unit  120  is disposed at a side of the deposition source  110 , and in particular, at the side of the deposition source  110  facing the substrate  500 . The deposition source nozzle unit  120  includes a plurality of deposition source nozzles  121  arranged at equal intervals in the X-axis direction. The deposition material  115  that is vaporized in the deposition source  110  passes through the deposition source nozzles  121  of the deposition source nozzle unit  120  towards the substrate  500 , which constitutes a target on which the deposition material  115  is to be deposited. 
     The barrier plate assembly  130  is disposed at a side of the deposition source nozzle unit  120  between the deposition source nozzle unit  120  and the patterning slit sheet  150 . The barrier plate assembly  130  includes a plurality of barrier plates  131 , and a barrier plate frame  132  that covers sides of the barrier plates  131 . The plurality of barrier plates  131  may be arranged parallel to each other at equal intervals in the X-axis direction. In addition, each of the barrier plates  131  may be arranged parallel to a Y-Z plane in  FIG. 12 , and may have a rectangular shape. The plurality of barrier plates  131  arranged as described above partition the space between the deposition source nozzle unit  120  and the patterning slit sheet  150  into a plurality of sub-deposition spaces S (see  FIG. 14 ). In the thin film deposition assembly  100  according to the current embodiment of the present invention, as illustrated in  FIG. 14 , the deposition space is divided by the barrier plates  131  into the sub-deposition spaces S that respectively correspond to the deposition source nozzles  121  through which the deposition material  115  is discharged. 
     The barrier plates  131  may be respectively disposed between adjacent deposition source nozzles  121 . In other words, each of the deposition source nozzles  121  may be disposed between two adjacent barrier plates  131 . The deposition source nozzles  121  may be respectively located at the midpoint between two adjacent barrier plates  131 . However, the present invention is not limited to this structure. For example, a plurality of deposition source nozzles  121  may be disposed between two adjacent barrier plates  131 . In this case, the deposition source nozzles  121  may be also respectively located at the midpoint between two adjacent barrier plates  131 . 
     As described above, since the barrier plates  131  partition the space between the deposition source nozzle unit  120  and the patterning slit sheet  150  into the plurality of sub-deposition spaces S, the deposition material  115  discharged through each of the deposition source nozzles  121  is not mixed with the deposition material  115  discharged through the other deposition source nozzles slits  121 , and passes through the patterning slits  151  so as to be deposited on the substrate  500 . In other words, the barrier plates  131  guide the deposition material  115 , which is discharged through the deposition source nozzles slits  121 , to move straight, and not to deviate in the X-axis direction. 
     As described above, the deposition material  115  is forced to move straight by installing the barrier plates  131 , so that a smaller shadow zone may be formed on the substrate  500  compared to a case where no barrier plates are installed. Thus, the thin film deposition assembly  100  and the substrate  500  can be spaced apart from each other by a predetermined distance. This will be described later in detail. 
     The barrier plate frame  132 , which forms sides of the barrier plates  131 , maintains the positions of the barrier plates  131 , and guides the deposition material  115 , which is discharged through the deposition source nozzles  121 , and prevents deviation of the deposition material in the Y-axis direction. 
     The deposition source nozzle unit  120  and the barrier plate assembly  130  may be separated from each other by a predetermined distance. This separation may prevent the heat radiated from the deposition source unit  110  from being conducted to the barrier plate assembly  130 . However, aspects of the present invention are not limited to this feature. For example, an appropriate heat insulator (not shown) may be further disposed between the deposition source nozzle unit  120  and the barrier plate assembly  130 . In this case, the deposition source nozzle unit  120  and the barrier plate assembly  130  may be bound together with the heat insulator therebetween. 
     In addition, the barrier plate assembly  130  may be constructed to be detachable from the thin film deposition assembly  100 . In the thin film deposition assembly  100  of the thin film deposition apparatus according to the current embodiment of the present invention, the deposition space is enclosed by using the barrier plate assembly  130 , so that the deposition material  115  that is not deposited on the substrate  500  is mostly deposited within the barrier plate assembly  130 . Thus, since the barrier plate assembly  130  is constructed to be detachable from the thin film deposition assembly  100 , when a large amount of the deposition material  115  is present on the barrier plate assembly  130  after a long deposition process, the barrier plate assembly  130  may be detached from the thin film deposition assembly  100  and then placed in a separate deposition material recycling apparatus in order to recover the deposition material  115 . Due to the structure of the thin film deposition assembly  100  according to the present embodiment, a reuse rate of the deposition material  115  is increased, so that the deposition efficiency is improved, and thus the manufacturing costs are reduced. 
     The patterning slit sheet  150  and a frame  155  in which the patterning slit sheet  150  is bound are disposed between the deposition source  110  and the substrate  500 . The frame  155  may be formed in a lattice shape, similar to a window frame. The patterning slit sheet  150  is bound inside the frame  155 . The patterning slit sheet  150  includes a plurality of patterning slits  151  arranged in the X-axis direction. The patterning slits  151  extend as openings in the Y-axis direction. The deposition material  115  that has been vaporized in the deposition source  110  and passed through the deposition source nozzle  121  passes through the patterning slits  151  towards the substrate  500 . 
     The patterning slit sheet  150  may be formed of a metal thin film. The patterning slit sheet  150  is fixed to the frame  150  such that a tensile force is exerted thereon. The patterning slits  151  may be formed by etching the patterning slit sheet  150  into a stripe pattern. 
     In the thin film deposition assembly  100  according to the current embodiment of the present invention, the total number of patterning slits  151  may be greater than the total number of deposition source nozzles  121 . In addition, there may be a greater number of patterning slits  151  than deposition source nozzles  121  disposed between two adjacent barrier plates  131 . The number of patterning slits  151  may be equal to the number of deposition patterns to be formed on the substrate  500 . 
     In addition, the barrier plate assembly  130  and the patterning slit sheet  150  may be disposed to be spaced apart from each other by a predetermined distance. Alternatively, the barrier plate assembly  130  and the patterning slit sheet  150  may be connected by a second connection member  133 . The temperature of the barrier plate assembly  130  may increase to 100° C. or higher due to the deposition source  110  whose temperature is high. Thus, in order to prevent the heat of the barrier plate assembly  130  from being conducted to the patterning slit sheet  150 , the barrier plate assembly  130  and the patterning slit sheet  150  may be separated from each other by a predetermined distance. 
     As described above, the thin film deposition assembly  100  according to the current embodiment of the present invention performs deposition while the thin film deposition assembly  100  or the substrate  500  is moved relative to the other. In order to move the thin film deposition assembly  100  relative to the substrate  500 , the patterning slit sheet  150  is spaced apart from the substrate  500  by a predetermined distance. In addition, in order to prevent the formation of a relatively large shadow zone on the substrate  500  when the patterning slit sheet  150  and the substrate  500  are spaced from each other, the barrier plates  131  are arranged between the deposition source nozzle unit  120  and the patterning slit sheet  150  to force the deposition material  115  to move in a straight direction. Thus, the size of the shadow zone that may be formed on the substrate  500  is sharply reduced. 
     In a conventional deposition method using an FMM, deposition is performed with the FMM in close contact with a substrate in order to prevent formation of a shadow zone on the substrate. However, when the FMM is used in close contact with the substrate, the contact may cause defects, such as scratches on patterns formed on the substrate. In addition, in the conventional deposition method, the size of the mask has to be the same as the size of the substrate since the mask cannot be moved relative to the substrate. Thus, the size of the mask has to be increased as display devices become larger. However, it is not easy to manufacture such a large mask. 
     In order to overcome this problem, in the thin film deposition assembly  100  according to the current embodiment of the present invention, the patterning slit sheet  150  is disposed to be spaced apart from the substrate  500  by a predetermined distance. The formation of a desirable deposition pattern may be facilitated by installing the barrier plates  131  to reduce the size of the shadow zone formed on the substrate  500 . 
     As described above, when the patterning slit sheet  150  is manufactured to be smaller than the substrate  500 , the patterning slit sheet  150  may be moved relative to the substrate  500  during deposition. Thus, it is no longer necessary to manufacture a large FMM as used in the conventional deposition method. In addition, since the substrate  500  and the patterning slit sheet  150  are spaced apart from each other, defects caused due to contact therebetween may be prevented. In addition, since it is unnecessary to contact the substrate  500  with the patterning slit sheet  150  during a deposition process, the manufacturing speed may be improved. 
     As shown in  FIG. 12 , the thin film deposition assembly  100  may also include one or more alignment devices  170  and one or more alignment targets  159  that assist in alignment of the patterning slit sheet  150  with respect to the substrate  100 . 
       FIG. 15  is a schematic perspective view of a modified example of the thin film deposition assembly  100  of  FIG. 12 . 
     Referring to  FIG. 15 , the thin film deposition assembly  100  according to the current embodiment includes a deposition source  110 , a deposition source nozzle unit  120 , a first barrier plate assembly  130 , a second barrier plate assembly  140 , and a patterning slit sheet  150 . 
     Although a chamber is not illustrated in  FIG. 15  for convenience of explanation, all the components of the thin film deposition assembly  100  may be disposed within a chamber that is maintained at an appropriate degree of vacuum. The chamber is maintained at an appropriate vacuum in order to allow a deposition material to move in a substantially straight line through the thin film deposition assembly  100 . 
     The substrate  500 , which constitutes a target on which a deposition material  115  is to be deposited, is disposed in the chamber. The deposition source  115  that contains and heats the deposition material  115  is disposed in an opposite side of the chamber to the side in which the substrate  500  is disposed. 
     Detailed structures of the deposition source  110  and the patterning slit sheet  150  are the same as those of  FIG. 12  and thus, detailed descriptions thereof will not be repeated here. The first barrier plate assembly  130  is the same the barrier plate assembly  130  of  FIG. 4  and thus, a detailed description thereof will not be repeated here. 
     The second barrier plate assembly  140  is disposed at a side of the first barrier plate assembly  130 . The second barrier plate assembly  140  includes a plurality of second barrier plates  141  and a second barrier plate frame  141  that constitutes an outer plate of the second barrier plates  142 . 
     The plurality of second barrier plates  141  may be arranged parallel to each other at equal intervals in the X-axis direction. In addition, each of the second barrier plates  141  may be formed to extend in the YZ plane in  FIG. 11 , i.e., perpendicular to the X-axis direction. 
     The plurality of first barrier plates  131  and second barrier plates  141  arranged as described above partition the space between the deposition source nozzle unit  120  and the patterning slit sheet  150 . The deposition space is divided by the first barrier plates  131  and the second barrier plates  141  into sub-deposition spaces that respectively correspond to the deposition source nozzles  121  through which the deposition material  115  is discharged. 
     The second barrier plates  141  may be disposed to correspond to the first barrier plates  131 . The second barrier plates  141  may be respectively disposed to be parallel to and to be on the same plane as the first barrier plates  131 . Each pair of the corresponding first and second barrier plates  131  and  141  may be located on the same plane. Although the first barrier plates  131  and the second barrier plates  141  are respectively illustrated as having the same thickness in the Y-axis direction, aspects of the present invention are not limited thereto. The second barrier plates  141 , which may be accurately aligned with the patterning slit sheet  151 , may be formed to be relatively thin, whereas the first barrier plates  131 , which do not need to be precisely aligned with the patterning slit sheet  151 , may be formed to be relatively thick. This makes it easier to manufacture the thin film deposition assembly  100 . 
     As illustrated in  FIG. 1 , a plurality of thin film deposition assemblies, which each have the same structure as the thin film deposition assembly  100  described above with respect to  FIGS. 12 and 15 , may be successively disposed in the first chamber  731 . In this case, the thin film deposition assemblies  100 ,  200 ,  300  and  400  may be used to deposit different deposition materials, respectively. For example, the thin film deposition assemblies  100 ,  200 ,  300  and  400  may have different patterning slit patterns, so that pixels of different colors, for example, red, green and blue, may be simultaneously defined through a film deposition process. Moreover, the thin film deposition assemblies  100 ,  200 ,  300 ,  400  may be located in a single deposition chamber  731  as shown in  FIG. 1  or in separate deposition chambers  731  and  732  housed in a single deposition unit  730  as shown in  FIG. 2  through which a circulating unit  610  conveys an electrostatic chuck  600  to which a substrate  500  is affixed. 
       FIG. 16  is a cross-sectional view of an active matrix organic light-emitting display device fabricated by using a thin film deposition apparatus, according to an embodiment of the present invention. It is to be understood that where is stated herein that one layer is “formed on” or “disposed on” a second layer, the first layer may be formed or disposed directly on the second layer or there may be intervening layers between the first layer and the second layer. Further, as used herein, the term “formed on” is used with the same meaning as “located on” or “disposed on” and is not meant to be limiting regarding any particular fabrication process. 
     Referring to  FIG. 16 , the active matrix organic light-emitting display device according to the current embodiment is formed on a substrate  30 . The substrate  30  may be formed of a transparent material, such as, for example, glass, plastic or metal. An insulating layer  31 , such as a buffer layer, is formed on an entire surface of the substrate  30 . 
     A thin film transistor (TFT)  40 , a capacitor  50 , and an organic light-emitting diode (OLED)  60  are disposed on the insulating layer  31 , as illustrated in  FIG. 16 . 
     A semiconductor active layer  41  is formed on an upper surface of the insulating layer  31  in a predetermined pattern. A gate insulating layer  32  is formed to cover the semiconductor active layer  41 . The semiconductor active layer  41  may include a p-type or n-type semiconductor material. 
     A gate electrode  42  of the TFT  40  is formed in a region of the gate insulating layer  32  corresponding to the semiconductor active layer  41 . An interlayer insulating layer  33  is formed to cover the gate electrode  42 . The interlayer insulating layer  33  and the gate insulating layer  32  are etched by, for example, dry etching, to form a contact hole exposing parts of the semiconductor active layer  41 . 
     A source/drain electrode  43  is formed on the interlayer insulating layer  33  to contact the semiconductor active layer  41  through the contact hole. A passivation layer  34  is formed to cover the source/drain electrode  43 , and is etched to expose a part of the drain electrode  43 . An insulating layer (not shown) may be further formed on the passivation layer  34  so as to planarize the passivation layer  34 . 
     In addition, the OLED  60  displays predetermined image information by emitting red, green, or blue light according to a flow of current. The OLED  60  includes a first electrode  61  disposed on the passivation layer  34 . The first electrode  61  is electrically connected to the drain electrode  43  of the TFT  40 . 
     A pixel defining layer  35  is formed to cover the first electrode  61 . An opening  64  is formed in the pixel defining layer  35 , and an organic light-emitting layer  63  is formed in a region defined by the opening  64 . A second electrode  62  is formed on the organic light-emitting layer  63 . 
     The pixel defining layer  35 , which defines individual pixels, is formed of an organic material. The pixel defining layer  35  also planarizes the surface of a region of the substrate  30  in which the first electrode  61  is formed, and in particular, the surface of the passivation layer  34 . 
     The first electrode  61  and the second electrode  62  are insulated from each other, and respectively apply voltages of opposite polarities to the organic light-emitting layer  63  to induce light emission. 
     The organic light-emitting layer  63  may be formed of a low-molecular weight organic material or a high-molecular weight organic material. When a low-molecular weight organic material is used, the organic light-emitting layer  63  may have a single or multi-layer structure including at least one selected from the group consisting of a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL). Examples of available organic materials may include copper phthalocyanine (CuPc), N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB), tris-8-hydroxyquinoline aluminum (Alq3), and the like. 
     An organic light-emitting layer  63  containing such low-molecular weight organic materials may be formed by depositing organic materials by vacuum deposition using one of the thin film deposition apparatuses described above with reference to  FIGS. 1 through 15 . After the opening  64  is formed in the pixel defining layer  35 , the substrate  30  is transferred to the first chamber  731 , as illustrated in  FIG. 1  or  2  (the substrate  30  is  FIG. 16  may be a substrate  500  as shown in  FIGS. 1 and 2 ). Target organic materials are deposited by the first to forth thin film deposition assemblies  100  to  400 . 
     After the organic light-emitting layer  63  is formed, the second electrode  62  may be formed by the same deposition method as used to form the organic light-emitting layer  63 . 
     The first electrode  61  may function as an anode, and the second electrode  62  may function as a cathode. Alternatively, the first electrode  61  may function as a cathode, and the second electrode  62  may function as an anode. The first electrode  61  may be patterned to correspond to individual pixel regions, and the second electrode  62  may be formed to cover all the pixels. 
     The first electrode  61  may be formed as a transparent electrode or a reflective electrode. A transparent electrode may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium oxide (In 2 O 3 ). A reflective electrode may be formed by forming a reflective layer from silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr) or a compound thereof and forming a layer of ITO, IZO, ZnO, or In 2 O 3  on the reflective layer. The first electrode  61  may be formed by forming a layer by, for example, sputtering, and then patterning the layer by, for example, photolithography. 
     The second electrode  62  may also be formed as a transparent electrode or a reflective electrode. When the second electrode  62  is formed as a transparent electrode, the second electrode  62  functions as a cathode. To this end, such a transparent electrode may be formed by depositing a metal having a low work function, such as lithium (Li), calcium (Ca), lithium fluoride/calcium (LiF/Ca), lithium fluoride/aluminum (LiF/Al), aluminum (Al), silver (Ag), magnesium (Mg), or a compound thereof on a surface of the organic light-emitting layer  63  and forming an auxiliary electrode layer or a bus electrode line thereon from ITO, IZO, ZnO, In 2 O 3 , or the like. When the second electrode  62  is formed as a reflective electrode, the reflective layer may be formed by depositing Li, Ca, LiF/Ca, LiF/Al, Al, Ag, Mg, or a compound thereof on the entire surface of the organic light-emitting layer  63 . The second electrode  62  may be formed by using the same deposition method as used to form the organic light-emitting layer  63  described above. 
     The thin film deposition apparatuses according to the embodiments of the present invention described above may be applied to form an organic layer or an inorganic layer of an organic TFT, and to form layers from various materials. 
     Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.