Patent Publication Number: US-2023147236-A1

Title: Oled display panel, manufacturing method thereof, and oled display device

Description:
FIELD OF DISCLOSURE 
     The present disclosure relates to the field of display technologies, in particular to an organic light-emitting diode (OLED) display panel, a manufacturing method thereof, and an OLED display device. 
     BACKGROUND 
     Organic light-emitting diode (OLED) display devices are widely used in various fields due to their lightness, wide viewing angles, fast response speed, low temperature resistance, high luminous efficiency, and the ability to prepare curved flexible displays. In order to improve a screen-to-body ratio, existing OLED display devices will be designed with special-shaped openings. However, the existing special-shaped openings are set at an edge of a display area, it causes modules (such as under-screen cameras, infrared sensors, earpieces, etc.) to be restricted to the special-shaped openings, and it affects a flexibility of setting the modules (such as under-screen cameras, infrared sensors, earpieces, etc.) 
     In order to solve the above problems, an existing OLED display panel is designed to be an OLED display panel having an O-cut (O-shaped opening). As shown in  FIG.  1   , the OLED display panel is designed with an O-shaped through hole in a display area. Due to a flexibility of an installation position of the O-shaped through hole, it is more flexible to set modules (such as under-screen cameras, infrared sensors, earpieces, etc.) under the through hole, which solves the technical problem of inflexible arrangement of the modules (such as under-screen cameras, infrared sensors, earpieces, etc.) In an area of the O-shaped through hole, a plurality of undercut sections are disposed to isolate an organic luminescent material and to prevent water and oxygen from entering. However, during a test of the OLED display panel, it may break from a concave corner of the undercut section, which will cause a failure of the OLED display device. 
     Accordingly, the existing OLED display panel has a technical problem that it may break from the concave corner of the undercut section, which will cause a failure of the OLED display device. 
     SUMMARY OF DISCLOSURE 
     Embodiments of the present disclosure provide an OLED display panel, a manufacturing method thereof, and an OLED display device to solve a technical problem that an existing OLED display panel is easily broken from a concave corner of an undercut section, which will cause a failure of the OLED display device. 
     In order to solve the above technical problem, the present disclosure provides technical solutions as follows. 
     An embodiment of the present disclosure provides an organic light-emitting diode (OLED) display panel, including:
     a special-shaped cutting area;   a display area surrounding the special-shaped cutting area. The display area includes an active display area, a first encapsulation area, and a second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area.   

     A stress buffering member is disposed in a concave corner of an undercut section of the second encapsulation area. 
     In some embodiments, the second encapsulation area includes a substrate, a pixel definition layer disposed on the substrate, and an encapsulation layer disposed on the pixel definition layer. In the second encapsulation area, the encapsulation layer includes a first inorganic layer and a second inorganic layer. The OLED display panel includes at least two of the undercut sections, and in the concave corner of at least one of the undercut sections, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, material of the stress buffering member includes an organic material. 
     In some embodiments, in the first encapsulation area, the encapsulation layer includes the first inorganic layer, the second inorganic layer, and an organic layer disposed between the first inorganic layer and the second inorganic layer. In the second encapsulation area, the stress buffering member is formed by etching the organic layer. 
     In some embodiments, the OLED display panel further includes a stress buffering layer. In the second encapsulation area, the stress buffering layer is disposed between the first inorganic layer and the second inorganic layer, and the stress buffering member is formed by etching the stress buffering layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. In the second concave corner, the second inorganic layer is disposed on the first inorganic layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the second inorganic layer is disposed on the first inorganic layer. In the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner and the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, an undercut section is formed in the first encapsulation area, and an organic layer is disposed in the undercut section. 
     In some embodiments, a first barrier and a second barrier are formed in the first encapsulation area. The first barrier is disposed between the display area and the second barrier. 
     Also, an embodiment of the present disclosure provides a manufacturing method of an organic light-emitting diode (OLED) display panel, including:
     providing a substrate, and etching a second flexible layer and a second barrier layer to form an undercut section, where the substrate includes a first flexible layer, a first barrier layer, the second flexible layer, and the second barrier layer;   forming a thin film transistor array layer on the substrate;   forming a luminous functional layer on the thin film transistor array layer;   forming a first inorganic layer on the luminous functional layer;   forming an organic layer on the first inorganic layer, and etching the organic layer in a second encapsulation area to form a stress buffering member in a concave corner of the undercut section. The OLED display panel includes a special-shaped cutting area and a display area surrounding the special-shaped cutting area, and the display area includes an active display area, a first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area; and   forming a second inorganic layer on the first inorganic layer and the organic layer, where an encapsulation layer includes the first inorganic layer, the organic layer, and the second inorganic layer.   

     Also, an embodiment of the present disclosure provides an organic light-emitting diode (OLED) display device including an OLED display panel. The OLED display panel includes:
     a special-shaped cutting area;   a display area surrounding the special-shaped cutting area. The display area includes an active display area, a first encapsulation area, and a second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area.   

     A stress buffering member is disposed in a concave corner of an undercut section of the second encapsulation area. 
     In some embodiments, the second encapsulation area includes a substrate, a pixel definition layer disposed on the substrate, and an encapsulation layer disposed on the pixel definition layer. In the second encapsulation area, the encapsulation layer includes a first inorganic layer and a second inorganic layer. The OLED display panel includes at least two of the undercut sections, and in the concave corner of at least one of the undercut sections, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, material of the stress buffering member includes an organic material. 
     In some embodiments, in the first encapsulation area, the encapsulation layer includes the first inorganic layer, the second inorganic layer, and an organic layer disposed between the first inorganic layer and the second inorganic layer. In the second encapsulation area, the stress buffering member is formed by etching the organic layer. 
     In some embodiments, the OLED display panel includes a stress buffering layer. In the second encapsulation area, the stress buffering layer is disposed between the first inorganic layer and the second inorganic layer, and the stress buffering member is formed by etching the stress buffering layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. In the second concave corner, the second inorganic layer is disposed on the first inorganic layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the second inorganic layer is disposed on the first inorganic layer. In the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner and the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In some embodiments, an undercut section is formed in the first encapsulation area, and an organic layer is disposed in the undercut section. 
     Embodiments of the present disclosure provide an OLED display panel, a manufacturing method thereof, and an OLED display device. The OLED display panel includes a special-shaped cutting area and a display area. The display area surrounds the special-shaped cutting area. The display area includes an active display area, a first encapsulation area, and a second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. A stress buffering member is disposed in a concave corner of an undercut section of the second encapsulation area. By disposing the stress buffering member in the concave corner of the undercut section, a stress at the concave corner is eliminated, and the undercut section is prevented from being broken, such that a technical problem that an existing OLED display panel is easily broken from a concave corner of a undercut section, which leads to a failure of the OLED display panel, is solved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic diagram of an organic light-emitting diode (OLED) display panel in the prior art. 
         FIG.  2    is a cross-sectional view of the existing OLED display panel of  FIG.  1    along A1-A2. 
         FIG.  3    shows comparison diagrams of the existing OLED display panel before and after a test. 
         FIG.  4    is a schematic diagram of an OLED display panel of an embodiment of the present disclosure. 
         FIG.  5    is a first cross-sectional view of the OLED display panel of  FIG.  4    along B1-B2. 
         FIG.  6    is a second cross-sectional view of the OLED display panel of  FIG.  4    along B1-B2. 
         FIG.  7    is a flowchart showing a manufacturing method of an OLED display panel of an embodiment of the present disclosure. 
         FIG.  8    shows schematic diagrams of the OLED display panel corresponding to processes of the manufacturing method of the OLED display panel. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure provides an organic light-emitting diode (OLED) display panel, a manufacturing method thereof, and an OLED display device. In order to more clearly describe the technical solutions of the embodiments of the present disclosure, accompanying drawings to be used in the detailed description of the disclosure will be briefly described hereinbelow. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, and are not used to limit the present disclosure. 
     The present disclosure embodiment is directed to a technical problem that an existing OLED display panel is easily broken from a concave corner of an undercut section, which will cause a failure of the OLED display device. Embodiments of the present disclosure are employed to solve this technical problem. 
     As shown in  FIG.  1   , in order to achieve flexibility in setting of modules (such as under-screen cameras, infrared sensors, earpieces, etc.), an existing OLED display panel  11  will be provided with an O-shaped opening  10 . The O-shaped opening can be set at any position in the display area, such that the setting of the modules (such as under-screen cameras, infrared sensors, earpieces, etc.) is flexible. However, in the OLED display panel, in order to improve an ability of the OLED display panel to prevent water and oxygen from entering, a plurality of undercut sections will be formed in the OLED display panel. As shown in  FIG.  2   , the OLED display panel includes a substrate  11 , a thin film transistor array layer  12 , a luminous functional layer  13 , and an encapsulation layer  14 . The substrate  11  includes a first flexible layer  111 , a first inorganic barrier layer  112 , a second flexible layer  113 , and a second inorganic barrier layer  114 . The encapsulation layer  14  includes a first inorganic encapsulation layer  141 , a first organic encapsulation layer  142 , and a second inorganic encapsulation layer  143 . In the OLED display panel, in order to improve the ability of the OLED display panel to prevent water and oxygen from entering, an undercut section  15  will be formed in the OLED display panel. As shown in  FIG.  2   , the OLED display panel includes an active display area  171 , a first encapsulation area  172 , and a second encapsulation area  173 . The undercut section  15  is disposed in the second encapsulation area  173  to isolate the first organic encapsulation layer  142 , thereby preventing the permeation of water and oxygen from the first organic encapsulation layer  142 . As shown in a of  FIG.  3   , during a test of the OLED display panel, there is no damage in the undercut section before the test. However, as shown in b of  FIG.  3   , after the test of the OLED display panel, a film layer at the concave corner  16  of the undercut section  15  is broken. In actual use, it will cause the OLED display panel to fail, that is, the existing OLED display panel may easily break from the concave corner of the undercut section, resulting in the OLED display panel fails. 
     As shown in  FIG.  4    and  FIG.  5   , an embodiment of the present disclosure provides an OLED display panel. The OLED display pane  14  includes a special-shaped cutting area  41  and a display area  42 . 
     The display area  42  surrounds the special-shaped cutting area  41 . The display area  42  includes an active display area  421 , a first encapsulation area  422 , and a second encapsulation area  423 , and the first encapsulation area  422  and the second encapsulation area  423  are disposed between the active display area  421  and the special-shaped cutting area  41 . 
     A stress buffering member  57  is disposed in a concave corner  56  of an undercut section  55  of the second encapsulation area  423 . 
     The embodiment of the present disclosure provides the OLED display panel The OLED display panel includes the special-shaped cutting area and the display area. The display area surrounds the special-shaped cutting area. The display area includes the active display area, the first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. The stress buffering member is disposed in the concave corner of the undercut section of the second encapsulation area. By disposing the stress buffering member in the concave corner of the undercut section, a stress at the concave corner is eliminated, and the undercut section is prevented from being broken, such that a technical problem that an existing OLED display panel is easily broken from a concave corner of a undercut section, which leads to a failure of the OLED display panel, is solved. 
     In one embodiment, as shown in  FIG.  5   , the OLED display panel includes a substrate  51 , a thin film transistor array layer  52 , a luminous functional layer  53 , and an encapsulation layer  54 . The substrate  51  includes a first flexible layer  511 , a first barrier layer  512 , a second flexible layer  513 , and a second barrier layer  514 . The thin film transistor array layer  52  includes a buffer layer, an active layer, a first gate insulating layer, a first metal layer, a second gate insulating layer, a second metal layer, an interlayer insulating layer, a source/drain layer, and a planarization layer. The luminous functional layer  53  includes a pixel electrode layer, a pixel definition layer, a light-emitting material layer disposed in a light-emitting area defined by the pixel definition layer, and a common electrode layer. The encapsulation layer  54  includes a first inorganic layer  541 , an organic layer  542 , and a second inorganic layer  543 . 
     In one embodiment, the second encapsulation area includes a substrate, a pixel definition layer disposed on the substrate, and an encapsulation layer disposed on the pixel definition layer. In the second encapsulation area, the encapsulation layer includes a first inorganic layer and a second inorganic layer. The OLED display panel is formed with at least two of the undercut sections. In the concave corner of at least one undercut section, a stress buffering member is disposed between the first inorganic layer and the second inorganic layer. In the OLED display panel, for film layers in the concave corner of the undercut section in the second encapsulation layer is easily broken, the stress buffering member can be formed in the concave corner of the undercut section. Specifically, the stress buffering member is formed between the first inorganic layer and the second inorganic layer, so that the stress buffering member reduces the stress at the concave corner, thereby preventing the film layers in the concave corner from breaking. Regarding the number of stress buffering member, the stress buffering member can be disposed in a concave corner of one undercut section. Alternatively, the stress buffering members can be disposed in concave corners of a plurality of undercut sections. Alternatively, the stress buffering member can be disposed in a concave corner of each undercut section. Moreover, in the OLED display panel, the undercut sections formed by the encapsulation layer include at least two, so that the organic material layer can be isolated, thereby avoiding water and oxygen from entering, and achieving a better ability to prevent the block water and oxygen. 
     In one embodiment, material of the stress buffering member includes an organic material. When forming the stress buffering member, considering a high flexibility of the organic material, the organic material can be used as the material of the stress buffering member, such as polystyrene, phenolic resin, etc. 
     In one embodiment, in the first encapsulation area, the encapsulation layer includes the first inorganic layer, the second inorganic layer, and the organic layer disposed between the first inorganic layer and the second inorganic layer. In the second encapsulation area, the organic layer is etched to form the stress buffering member. In the first encapsulation area and display area, in order to make the display panel have a certain flexibility, the encapsulation layer will be formed by alternately stacking the inorganic layer and the organic layer. The stress buffering member can be formed when the organic layer is etched, thereby reducing the stress at the undercut section. 
     In one embodiment, the OLED display panel includes a stress buffering layer. In the second encapsulation area, the stress buffering layer is disposed between the first inorganic layer and the second inorganic layer. The stress buffering layer is etched to form the stress buffering member. When forming the stress buffering member, a layer of the stress buffering layer can be formed in the OLED display panel. The stress buffering layer may be made of the organic material, so that the stress buffering layer forms the stress buffering member, and there is no need to change a manufacturing method of the organic layer to reset the stress buffering layer, thereby reducing the stress at the undercut section. 
     In one embodiment, the undercut section is formed with a first concave corner and a second concave corner. The first concave corner is disposed on a left side of the undercut section. The second concave corner is disposed on a right side of the undercut section. In the first concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. In the second concave corner, the second inorganic layer is disposed on the first inorganic layer. There are two concave corners formed in the undercut section. The stress at the first concave corner can be buffered, so as to avoid the first concave corner from breaking due to the stress. In the second concave corner, the first inorganic layer will be directly disposed on the second inorganic layer, and the stress buffering member will not be omitted. 
     In one embodiment, the undercut section is formed with a first concave corner and a second concave corner. The first concave corner is disposed on a left side of the undercut section. The second concave corner is disposed on a right side of the undercut section. In the first concave corner, the second inorganic layer is disposed on the first inorganic layer. In the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. When there are two concave corners in the undercut section, the stress at the second concave corner on the right side can be buffered, so as to avoid the stress at the second concave corner being too large, thereby preventing the second concave corner from breaking. Also, the second inorganic layer is directly disposed on the first inorganic layer. 
     In one embodiment, the undercut section is formed with a first concave corner and a second concave corner. The first concave corner is disposed on a left side of the undercut section. The second concave corner is disposed on a right side of the undercut section. In the first concave corner and the second concave corner, the stress buffering member is provided between the first inorganic layer and the second inorganic layer. When the first concave corner and the second concave corner are formed in the undercut section, by forming the stress buffering member between the first inorganic layer and the second inorganic layer in the first concave corner and the second concave corner, the stress at the first concave corner and the second concave corner is reduced, so that the film layers in the first concave corner and the second concave corner are prevented from breaking, thereby increasing a yield of the OLED display panel. 
     In one embodiment, the first encapsulation area is formed with the undercut section. The organic layer is provided in the undercut section. In a display panel, the undercut section will be disposed in the first encapsulation area. When the organic layer does not need to be removed in the first encapsulation area, the organic layer can be disposed in the undercut section in the first encapsulation area, so that the stress at the undercut section of the first encapsulation area is low, thereby avoiding breakage, and improving the flexibility of the display panel. 
     In one embodiment, as shown in  FIG.  6   , the first encapsulation area is formed with a first barrier and a second barrier. The first barrier is disposed between the display area and the second barrier. When forming the display panel, an undercut section may not form in the first encapsulation area, and the first barrier and the second barrier are form in the first encapsulation area, so that the barriers blocks the organic layer, prevents the organic layer from flowing into the second encapsulation area, and it ensures an encapsulation performance of the encapsulation layer. 
     As shown in  FIG.  7   , an embodiment of the present disclosure provides a manufacturing method of an OLED display panel. The manufacturing method of the OLED display panel includes the following. 
     In S 1 , a substrate is provided, and a second flexible layer and a second barrier layer are etched to form an undercut section. The substrate includes a first flexible layer, a first barrier layer, the second flexible layer, and the second barrier layer, an equivalent diagram is shown in (a) of  FIG.  8   . 
     In S 2 , a thin film transistor array layer is formed on the substrate. 
     In S 3 , a luminous functional layer is formed on the thin film transistor array layer. 
     In S 4 , a first inorganic layer is formed on the luminous functional layer, an equivalent diagram is shown in (b) of  FIG.  8   . 
     In S 5 , an organic layer is formed on the first inorganic layer, and the organic layer in a second encapsulation area is etched to form a stress buffering member in a concave corner of the undercut section. The OLED display panel includes a special-shaped cutting area and a display area surrounding the special-shaped cutting area. The display area includes an active display area, a first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area, an equivalent diagram is shown in (c) of  FIG.  8   . 
     In S 6 , a second inorganic layer is formed on the first inorganic layer and the organic layer. An encapsulation layer includes the first inorganic layer, the organic layer, and the second inorganic layer, an equivalent diagram is shown in (d) of  FIG.  8   . 
     The embodiment of the present disclosure provides the manufacturing method of the OLED display panel. The OLED display panel prepared by the manufacturing method of the OLED display panel includes the special-shaped cutting area and the display area. The display area surrounds the special-shaped cutting area. The display area includes the active display area, the first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. The stress buffering member is disposed in the concave corner of the undercut section of the second encapsulation area. By disposing the stress buffering member in the concave corner of the undercut section, a stress at the concave corner is eliminated, and the undercut section is prevented from being broken, such that a technical problem that an existing OLED display panel is easily broken from a concave corner of a undercut section, which leads to a failure of the OLED display panel, is solved. 
     An embodiment of the present disclosure provides an OLED display device including an OLED display panel. The OLED display panel includes a special-shaped cutting area and a display area. 
     The display area surrounds the special-shaped cutting area. The display area includes an active display area, a first encapsulation area, and a second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. 
     A stress buffering member is disposed in a concave corner of an undercut section of the second encapsulation area. 
     In the OLED display device of the embodiment of the present disclosure, the OLED display device includes the OLED display panel. The OLED display panel includes the special-shaped cutting area and the display area. The display area surrounds the special-shaped cutting area. The display area includes the active display area, the first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. The stress buffering member is disposed in the concave corner of the undercut section of the second encapsulation area. By disposing the stress buffering member in the concave corner of the undercut section, a stress at the concave corner is eliminated, and the undercut section is prevented from being broken, such that a technical problem that an existing OLED display panel is easily broken from a concave corner of a undercut section, which leads to a failure of the OLED display panel, is solved. 
     In one embodiment, in the OLED display device, the second encapsulation area includes a substrate, a pixel definition layer disposed on the substrate, and an encapsulation layer disposed on the pixel definition layer. In the second encapsulation area, the encapsulation layer includes a first inorganic layer and a second inorganic layer. The OLED display panel includes at least two of the undercut sections, and in the concave corner of at least one of the undercut sections, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In one embodiment, in the OLED display device, material of the stress buffering member includes an organic material. 
     In one embodiment, in the OLED display device, tin the first encapsulation area, the encapsulation layer includes the first inorganic layer, the second inorganic layer, and an organic layer disposed between the first inorganic layer and the second inorganic layer. In the second encapsulation area, the stress buffering member is formed by etching the organic layer. 
     In one embodiment, in the OLED display device, the OLED display panel includes a stress buffering layer. In the second encapsulation area, the stress buffering layer is disposed between the first inorganic layer and the second inorganic layer, and the stress buffering member is formed by etching the stress buffering layer. 
     In one embodiment, in the OLED display device, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. In the second concave corner, the second inorganic layer is disposed on the first inorganic layer. 
     In one embodiment, in the OLED display device, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner, the second inorganic layer is disposed on the first inorganic layer. In the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In one embodiment, in the OLED display device, the undercut section includes a first concave corner and a second concave corner, the first concave corner is disposed on a left side of the undercut section, the second concave corner is disposed on a right side of the undercut section. In the first concave corner and the second concave corner, the stress buffering member is disposed between the first inorganic layer and the second inorganic layer. 
     In one embodiment, in the OLED display device, an undercut section is formed in the first encapsulation area, and an organic layer is disposed in the undercut section. 
     According to the above embodiments: 
     The embodiments of the present disclosure provide the OLED display panel, the manufacturing method thereof, and the OLED display device. The OLED display panel includes the special-shaped cutting area and the display area. The display area surrounds the special-shaped cutting area. The display area includes the active display area, the first encapsulation area, and the second encapsulation area, and the first encapsulation area and the second encapsulation area are disposed between the active display area and the special-shaped cutting area. The stress buffering member is disposed in the concave corner of the undercut section of the second encapsulation area. By disposing the stress buffering member in the concave corner of the undercut section, the stress at the concave corner is eliminated, and the undercut section is prevented from being broken, such that a technical problem that an existing OLED display panel is easily broken from a concave corner of a undercut section, which leads to a failure of the OLED display panel, is solved. 
     It can be understood that, for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solutions of the present disclosure and its inventive concept. All these changes or replacements shall fall within the protection scope of the claims attached to the present disclosure.