Abstract:
A package, a packaging method thereof and an organic light-emitting diode (OLED) device are provided. The packaging assembly includes a first substrate and a second substrate which are arranged oppositely; a first sealing structure arranged between the first substrate and the second substrate, wherein the first sealing structure the first substrate and the second substrate enclose to form a first cavity; and a second sealing structure arranged between the first substrate and the second substrate, wherein the second sealing structure is positioned on the outer side of the first sealing structure and encloses a second cavity together with the first sealing structure, the first substrate and the second substrate.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure relates to a package, a packaging method thereof and an organic light-emitting diode (OLED) device. 
       BACKGROUND 
       [0002]    OLED is widely applied in display technology due to the advantages of self luminescence, rapid response, wide viewing angle, high brightness, bright color, light weight, etc. 
         [0003]    An OLED device package technology is to adopt glass frit package process. As illustrated in  FIG. 1 , in an OLED device, an OLED structure  03  is disposed between a glass cover plate  01  and a glass backplane  02 . The OLED main structure specifically includes an organic emission functional layer, etc. As the organic emission functional layer will produce irreversible photo-oxidation reaction in the presence of moisture and oxygen, in order to ensure the sealability of the OLED device, after the glass cover plate  01  is aligned to and bonded with the glass backplane  02 , glass frit is fused by laser to form a frit sealing layer  04 , and hence the OLED device is packaged. 
         [0004]    However, as most glass frit used in the frit package process is hard material, the OLED device has poor shock resistance and compressive property, and hence the mechanical property of the entire OLED device can be affected. 
       SUMMARY 
       [0005]    An embodiment of the disclosure provides a package, comprising: a first substrate and a second substrate arranged opposite to each other; a first sealing structure disposed between the first substrate and the second substrate, a first cavity being encircled by the first sealing structure, the first substrate and the second substrate; and a second sealing structure disposed between the first substrate and the second substrate, the second sealing structure being disposed on an outer side of the first sealing structure, and a second cavity being encircled by the second sealing structure, the first sealing structure, the first substrate and the second substrate. 
         [0006]    Another embodiment of the disclosure provides an organic light-emitting diode (OLED) device, comprising: the package as mentioned above, and an OLED structure disposed in the first cavity of the package. 
         [0007]    Another embodiment of the disclosure provides a packaging method, comprising: coating UV adhesive on a first substrate provided with sintered glass frit, the glass frit being disposed in a first sealing area of the first substrate; the UV adhesive being disposed in a second sealing area of a second substrate; the second sealing area is disposed on an outer side of the first sealing area; aligning and bonding the first substrate and a second substrate provided with an OLED structure; and forming a first sealing structure in the first sealing area between the first substrate and the second substrate, and forming a second sealing structure in the second sealing area, wherein a first cavity is encircled by the first sealing structure, the first substrate and the second substrate; the second sealing structure is disposed on an outer side of the first sealing structure; and a second cavity is encircled by the second sealing structure, the first sealing structure, the first substrate and the second substrate. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    Simple description will be given below to the accompanying drawings of the embodiments to provide a more clear understanding of the technical proposals of the embodiments of the present invention. Obviously, the drawings described below only involve some embodiments of the present invention but are not intended to limit the present invention. 
           [0009]      FIG. 1  is a schematic structural view of a packaged OLED device; 
           [0010]      FIG. 2 a    is a first sectional view of a package provided by the embodiment of the present disclosure; 
           [0011]      FIG. 2 b    is a top view of the package provided by the embodiment of the present disclosure; 
           [0012]      FIG. 3  is a second sectional view of a package provided by the embodiment of the present disclosure; 
           [0013]      FIG. 4  is a third sectional view of a package provided by the embodiment of the present disclosure; 
           [0014]      FIG. 5  is a first flowchart of a packaging method provided by the embodiment of the present disclosure; and 
           [0015]      FIG. 6  is a second flowchart of the packaging method provided by the embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    For more clear understanding of the objectives, technical proposals and advantages of the embodiments of the present invention, clear and complete description will be given below to the technical proposals of the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the preferred embodiments are only partial embodiments of the present invention but not all the embodiments. All the other embodiments obtained by those skilled in the art without creative efforts on the basis of the embodiments of the present invention illustrated shall fall within the scope of protection of the present invention. 
         [0017]    The foregoing description, for purposes of illustration and not limitation, put forwards specific details such as specific system structures, interfaces and technology for more clear understanding of the present invention. However, it should be understood by those skilled in the art that the present invention could also be achieved in other embodiments not provided with the specific details. In other cases, the detailed description of well-known devices, circuits and methods is omitted, so unnecessary details cannot hinder the description of the present invention. 
         [0018]    In addition, the terms “first” and “second” are only used for describing the objective and should not be construed as the indication or implication of the relative importance or the implication of the number of the indicated technical characteristics. Thus, the characteristic defined by “first” and “second” may indicate or imply that one or more characteristics are included. In the description of the present invention, unless otherwise specified, “a plurality of” means two or more than two. 
         [0019]    As illustrated in  FIGS. 2 a  and 2 b   , the embodiment of the present disclosure provides a package  100  (in which  FIG. 2 a    is a sectional view of the package  100  and  FIG. 2 b    is a top view of the package  100 ). The package  100  comprises a first substrate  101  and a second substrate  102  arranged opposite to each other; and a first sealing structure  103  disposed between the first substrate  101  and the second substrate  102 . A first cavity  200  is encircled by the first sealing structures  103 , the first substrate  101  and the second substrate  102  and may be configured to place an OLED structure. The OLED structure herein may be a whole structure of an OLED or one part of the OLED, e.g., an organic emission functional layer, a hole transport layer (HTL) and an electron transport layer (ETL). The layers may also be referred to as a main structure of the OLED. 
         [0020]    A second sealing structures  104  is further disposed between the first substrate  101  and the second substrate  102 . The second sealing structure  104  is disposed on the outer side of the first sealing structure  103 . A second cavity  300  is encircled by the second sealing structures  104 , the first sealing structures  103 , the first substrate  101  and the second substrate  102 . The second cavity can reduce the impact on the first sealing structures  103 . 
         [0021]    In addition, it should be noted that: in order to further reduce the impact on the first sealing structures  103 , a plurality of second cavities  300  can be disposed between the first substrate  101  and the second substrate  102 . No limitation will be given here in the present invention. 
         [0022]    As can be seen, as the second cavity  300  is formed between the first sealing structure  103  and the second sealing structure  104  in the package  100  and is configured to reduce the impact on the first sealing structure  103 , the second cavity  300  may be taken as a buffer layer between the first sealing structure  103  and the second sealing structure  104 , so the external impact on package materials in the first cavity  200  can be reduced as much as possible, and hence the shock resistance and the compressive property of the entire package  100  can be improved. 
         [0023]    For instance, as illustrated in  FIG. 2 , both sections of the first sealing structure  103  and the second sealing structure  104  in parallel to the first substrate are of an annular shape. Thus, the first sealing structure  103  and the second sealing structure  104  may be matched with the first substrate and the second substrate to form the first cavity and the second cavity. 
         [0024]    The first cavity  200  may be provided with an OLED main structure such as a hole transportation layer (HTL), an organic emission layer (EML) and an electron transportation layer (ETL) of an OLED device. As the OLED main structure will produce irreversible photo-oxidation reaction in the presence of moisture and oxygen, multiple sealing structures in the package  100  can prevent moisture and oxygen from entering the OLED main structure. Meanwhile, the shock resistance and the compressive property of the package  100  can be improved by the buffer layers between the first sealing structures  103  and the second sealing structures  104 . 
         [0025]    Moreover, the second cavity  300  is filled with a foaming agent and/or an organic adhesive. 
         [0026]    The foaming agent is a surface active substance and mainly has the functions of reducing the interfacial tension on a gas-water interface, promoting the formation of small air bubbles in paste, expanding a separation interface, and ensuring that the air bubbles rise to form a foam layer. The organic adhesive refers to a compound containing Si—C bond, in which at least one organic group is directly attached to silicon atoms. Both the organic adhesive and the foaming agent with low elastic modulus may be taken as effective buffer material. Therefore, when the foaming agent and/or the organic adhesive is filled into the second cavity  300 , the buffer effect of the buffer layers between the first sealing structures  103  and the second sealing structures  104  can be increased, and hence the shock resistance and the compressive property of the package  100  can be further improved. 
         [0027]    Moreover, a drying agent, e.g., water and oxygen reactive substances such as calcium sulfate, may also be added in the foaming agent and/or the organic adhesive. Thus, an effective protective layer may be formed on the periphery of the package materials in the first cavity  200 , and moisture and oxygen can be prevented from entering the package materials. 
         [0028]    Illustratively, based on the package  100  as illustrated in  FIGS. 2 a  and 2 b   , as illustrated in  FIG. 3  ( FIG. 3  is a sectional view of the package  100 ), the first substrate  101  is also provided with a connecting hole  105  communicated with the second cavity  300 . Thus, the foaming agent and/or the organic adhesive may be injected into the second cavity  300  through the connecting hole  105 . 
         [0029]    Moreover, based on the package  100  as shown in  FIG. 3 , as illustrated in  FIG. 4  ( FIG. 4  is a sectional view of the package  100 ), the connecting hole  105  may also be provided with a filling fused mass (fusible body)  106 . The fusible body  106  is a glass mixture for absorbing microwave or laser and may be configured to seal the connecting hole  105 . Thus, after the foaming agent and/or the organic adhesive is injected into the second cavity  300 , the fusible body  106  on the connecting hole  105  may be heated by laser or microwave, so that the fusible body  106  can be heated and fused to package the connecting hole  105 . The heat-affected zone of the package process is small, and excessive residual stress will not be produced to result in the warping of the first substrate  101 . 
         [0030]    In addition, the first sealing structure  103  in the package  100  may be specifically a sealing structure formed by the sintering, laser scanning and curing of glass frit via frit package process, and the second sealing structure  104  in the package  100  may be specifically a sealing structure formed by the curing of UV adhesive via UV package process, namely cured UV adhesive. The sealing structure formed by the frit package process has high moisture and oxygen resistance and poor mechanical property, and the UV package process is relative simple. Therefore, the package  100  provided with multiple sealing structures formed by the above processes can simplify the manufacturing process and improve the moisture and oxygen resistance of the package  100  as much as possible. 
         [0031]    The embodiment of the present disclosure provides a package, which comprises a first substrate and a second substrate arranged opposite to each other, wherein first sealing structure is disposed between the first substrate and the second substrate; a first cavity is encircled by the first sealing structure, the first substrate and the second substrate and configured to place an OLED main structure; a second sealing structure is also disposed between the first substrate and the second substrate; the second sealing structure is disposed on the outer side of the first sealing structure; and a second cavity is encircled by the second sealing structure, the first sealing structure, the first substrate and the second substrate and may be configured to reduce the impact on the first sealing structures. Thus, the second cavity may be taken as a buffer layer between the first sealing structure and the second sealing structure, so that the external impact on the OLED main structure in the first cavity can be reduced as much as possible, and hence the shock resistance and the compressive property of the entire package can be improved. 
         [0032]      FIG. 5  illustrates a packaging method provided by the embodiment of the present disclosure. The packaging method provided by the embodiment of the present disclosure is used for manufacturing the package  100  as illustrated in  FIGS. 1 to 4 . For convenient description, only those relevant to the embodiment of the present disclosure are illustrated. The specific technical details which are not indicated refer to the embodiments of the present disclosure as shown in  FIGS. 1 to 4 . 
         [0033]    For instance, taking an OLED device as an example, the packaging method comprises: 
         [0034]      101 : coating UV adhesive on a first substrate provided with sintered glass frit. 
         [0035]    The OLED device, for instance, includes a first substrate and a second substrate provided with an OLED main structure. When the OLED device is packaged, the first substrate and the second substrate must be aligned and bonded before package, so that the OLED main structure in the OLED device can be disposed in a moisture and oxygen resistant enclosed space. 
         [0036]    The glass frit is disposed in a first sealing area of the first substrate; the UV adhesive is disposed in a second sealing area of the second substrate; and the second sealing area is disposed on the outer side of the first sealing area. 
         [0037]    For instance, the first sealing area to be packaged of the first substrate may be coated with the glass frit by screen printing; subsequently, the first substrate coated with the glass frit is placed in a sintering furnace for sintering; and finally, UV adhesive is coated on the second sealing area of the sintered first substrate, in which the UV adhesive may be cured when irradiated under UV light and used as an adhesive. 
         [0038]    S 102 : aligning and bonding the first substrate and the second substrate provided with the OLED main structure. 
         [0039]    S 103 : forming a first sealing structure in the first sealing area between the first substrate and the second substrate, and forming a second sealing structure in the second sealing area. 
         [0040]    A first cavity is encircled by the first sealing structure, the first substrate and the second substrate; the second sealing structure is disposed on the outer side of the first sealing structure; and a second cavity is encircled by the second sealing structures, the first sealing structures, the first substrate and the second substrate. 
         [0041]    For instance, the first substrate and the second substrate may be subjected to first package to form the second sealing structure by adoption of UV light to irradiate a position of the first substrate coated with the UV adhesive (namely the second sealing area) via UV package process; and a position of the first substrate sintered with the glass frit (namely the first sealing area) is subjected to second package to form the first sealing structures by frit package process. 
         [0042]    As illustrated in  FIG. 2 a    or  2   b , a first cavity is encircled by the first sealing structure, the first substrate and the second substrate; and a second cavity is encircled by the first sealing structure, the second sealing structure, the first substrate and the second substrate. The second cavity may be taken as a buffer layer between the first sealing structure and the second sealing structure, so that the external impact on the OLED main structure in the first cavity can be reduced as much as possible, and hence the shock resistance and the compressive property of the entire package can be improved. 
         [0043]    Illustratively, the first substrate may also be provided with a connecting hole communicated with the second cavity, and the connecting hole is also provided with a fusible body, in which the fusible body is a glass mixture for absorbing microwave or laser. At this point, the embodiment of the present disclosure provides a packaging method, which, as illustrated in  FIG. 6 , specifically comprises: 
         [0044]      201 : coating UV adhesive on a first substrate sintered with glass frit. 
         [0045]    Specifically, a first sealing area of the first substrate may be coated with the glass frit by screen printing process according to a predetermined pattern on a screen; subsequently, the first substrate coated with the glass frit is placed in a sintering furnace for sintering; and finally, the UV adhesive is coated on a second sealing area of the sintered first substrate. 
         [0046]      202 : aligning and bonding the first substrate and a second substrate provided with an OLED main structure. 
         [0047]      203 : forming a second sealing structure by adoption of UV light to irradiate a position of the first substrate coated with the UV adhesive. 
         [0048]    As the UV adhesive may be cured when irradiated under UV light and taken as an adhesive, the UV light may be adopted to irradiate the position of the first substrate coated with the UV adhesive by UV package process, and the formed first sealing structures are respectively bonded to the first substrate and the second substrate. 
         [0049]      204 : forming a first sealing structure on a position of the first substrate sintered with the glass frit by glass frit package process. 
         [0050]    For instance, the first sealing structures are formed by the laser scanning of the position of the first substrate sintered with the glass frit by the frit package process, in which a gap is formed between the first sealing structure and the second sealing structure in  5203 . Thus, the second sealing structure is respectively bonded to the first sealing structure, the first substrate and the second substrate to form the second cavity. 
         [0051]    S 205 : injecting a foaming agent and/or an organic adhesive into the second cavity from a connecting hole on the first substrate. 
         [0052]    As the penetrable connecting hole is preformed on the first substrate, the foaming agent and/or the organic adhesive may be injected in the second cavity through the connecting hole. As both the organic adhesive and the foaming agent may be taken as an effective buffer material, when the foaming agent and/or the organic adhesive is filled into the second cavity, the buffer effect of the buffer layer between the first sealing structure and the second sealing structure can be increased, and hence the shock resistance and the compressive property of the package can be further improved. 
         [0053]    In addition, a drying agent, e.g., water and oxygen reactive substances such as calcium sulfate, may also be added in the foaming agent and/or the organic adhesive. Thus, an effective protective layer may be formed on the periphery of the OLED main structure in the first cavity, and moisture and oxygen can be prevented from entering the OLED main structure. 
         [0054]      206 : heating filling fused mass on the connecting hole by microwave or laser, and allowing the filling fused mass to be fused and seal the connecting hole. 
         [0055]    Finally, after the foaming agent and/or the organic adhesive is injected into the second cavity, the filling fused mass on the connecting hole may be heated by laser or microwave, so that the filling fused mass can be heated and fused to package the connecting hole. The heat-affected zone of the package process is small, and excessive residual stress cannot be produced to result in the warping of the first substrate. 
         [0056]    The embodiment of the present disclosure provides a packaging method, wherein a first sealing structure is disposed between a first substrate and a second substrate which are arranged opposite to each other; a first cavity is encircled by the first sealing structure, the first substrate and the second substrate and configured to place an OLED main structure; a second sealing structure is further disposed between the first substrate and the second substrate; the second sealing structure is disposed on the outer side of the first sealing structure; and a second cavity is encircled by the second sealing structure, the first sealing structure, the first substrate and the second substrate and may be configured to reduce the impact on the first sealing structures. Thus, the second cavity may be taken as a buffer layer between the first sealing structure and the second sealing structure, so that the external impact on the OLED main structure in the first cavity can be reduced as much as possible, and hence the shock resistance and the compressive property of the entire package can be improved. 
         [0057]    Moreover, the embodiment of the present disclosure further provides an OLED device, which specifically comprises the package  100  provided by the embodiment, and an OLED main structure disposed in the first cavity  200  of the package  100 , wherein the OLED main structure may specifically includes an HTL, an organic EML or an HTL of the OLED device. As the OLED main structure will produce irreversible photo-oxidation reaction in the presence of moisture and oxygen, the multiple sealing structures in the package  100  can prevent moisture and oxygen from entering the OLED main structure. Meanwhile, the shock resistance and the compressive property of the package  100  can be improved by the buffer layers between the first sealing structures  103  and the second sealing structures  104 . 
         [0058]    In the description, the specific characteristics, structures, materials or features may be combined properly in any one or more embodiments or examples. 
         [0059]    The foregoing is only the preferred embodiments of the present invention and not intended to limit the scope of protection of the present invention. The scope of protection of the present invention should be defined by the appended claims. 
         [0060]    The application claims priority to the Chinese patent application No. 201510312061.6, filed Jun. 8, 2015, the disclosure of which is incorporated herein by reference as part of the application.