An OLED display device, a preparation method thereof, and a display terminal

Abstract

An OLED display device, a manufacturing method thereof, and a display terminal. The OLED display device includes a middle frame and an OLED screen. The middle frame includes a bottom plate and a side plate located on one side of the bottom plate. The side plate is provided with a support structure for supporting the OLED screen at least in a part corresponding to the tail region; the OLED screen includes a super-clean film, a display layer, and a packaging cover plate which are stacked. The super-clean film is bonded to the bottom plate through an adhesive; the OLED screen is provided with side sealant at least in a part corresponding to the head region. The side sealant bonds the side end face of the super-clean film, the side end face of the display layer, and the surface of the packaging cover plate facing the bottom plate; the OLED screen and the support structure are bonded through the side sealant; the OLED display device has two corners in the head region, and a transition connection adhesive is provided between the middle frame and the OLED screen at a position corresponding to each corner. The transition connection adhesive connects the side sealant and the caulking adhesive. The OLED display device can reduce the black border while ensuring waterproof sealing performance.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and in particular, to an OLED display device, a preparation method thereof, and a display terminal. Background Art

[0002] With the rapid development and popularization of terminal devices such as smart phones, consumers' demands for terminal devices such as mobile phones are no longer limited to call functions, and the requirements for their aesthetics are getting higher and higher. For example, there are black borders around the OLED (organic light emitting diode) screens used in OLED display devices such as mobile phones, which seriously affect the aesthetics of the OLED display devices. Based on this, it is relatively important to reduce the black borders around the OLED screens.

[0003] However, blindly reducing the black borders of the OLED screen will result in the OLED screen not being tightly sealed. When the OLED screen gets liquid in, it will cause serious functional failures.

[0004] Therefore, how to ensure the waterproof and airtightness of the OLED screen while reducing the black borders of the OLED screen is an urgent problem to be solved. Summary of the Invention

[0005] The present application provides an OLED display device, a preparation method thereof, and a display terminal, which can ensure the waterproof and airtightness of the OLED screen while reducing the black borders of the OLED screen.

[0006] In a first aspect, the present application provides an OLED (organic light emitting diode) display device, which can be divided into a head region and a tail region, and the head region has two corners. In combination with the structure of the OLED display device, specifically, the OLED display device includes a middle frame and an OLED screen. Among them, the middle frame includes a bottom plate and a side plate provided on one side of the bottom plate. The side plate of the middle frame is provided with a support structure at least in the tail region, and the support structure is used to support the OLED screen. The OLED screen includes a super clean foam (SCF), a display layer, and a packaging cover plate that are stacked. Along the extension direction of the OLED screen, the packaging cover plate partially extends beyond the display layer and the super clean foam to form a protection for the display layer and the super clean foam; and the super clean foam plays a buffering role for the OLED screen. When connecting the middle frame and the OLED screen, a side sealant is formed at least in the part corresponding to the head region of the OLED screen, so that the side sealant bonds the side end face of the super clean foam, the side end face of the display layer, and the surface of the packaging cover plate facing the bottom plate to seal the side end face of this part of the OLED screen; the caulking adhesive on the support structure is used to bond the OLED screen and the middle frame, and this part of the OLED screen is sealed and fixed; and a transition connection adhesive is formed in each corner of the head region, so that the transition connection adhesive is connected to the caulking adhesive and the side sealant to form a complete sealing structure on the periphery of the OLED screen.

[0007] The OLED display device provided by the present application uses side sealant in cooperation with caulking adhesive and transition connection adhesive for waterproof sealing, and the support structure corresponding to this part of the OLED screen can be cancelled on the side plate of the middle frame, so that the black edge size of the OLED screen can be effectively reduced, thereby improving the overall aesthetics of the device. At the same time, the OLED display device provided by the present application performs waterproof sealing of the whole machine through side sealant, caulking adhesive, and transition connection adhesive, which can ensure and improve the waterproof performance of the overall device.

[0008] When specifically setting the structure of the transition connection adhesive, it can be set that the transition connection adhesive includes a dam structure and potting glue. Specifically, the dam structure includes a first dam and a second dam, and there is a gap between the second dam and the first dam. Specifically, the first dam connects the side sealant, the caulking adhesive, and the back adhesive; the second dam is provided on the side of the first dam close to the tail region, and the second dam connects the caulking adhesive and the back adhesive, and the potting glue is filled in the gap. It should be noted that in order to facilitate filling the potting glue in the gap, a potting hole for filling the potting glue can be provided in the part of the bottom plate corresponding to the gap. It should be understood that in specific settings, only the transition connection adhesive of one corner can be set to the above structure, or the transition connection adhesives of both corners can be set to the above structure, which can be specifically set according to requirements and will not be elaborated here.

[0009] When forming the side sealant structure on the OLED screen, it is possible to control the vertical projection of the encapsulation cover plate on the bottom plate to cover the vertical projection of the side sealant on the bottom plate. Specifically, in one possible implementation, it is possible to control the side sealant to have a certain distance from the edge of the encapsulation cover plate to prevent the side sealant from exceeding the edge of the encapsulation cover plate and causing interference between the encapsulation cover plate and the side plate during the assembly process. In another possible implementation, it is possible to control the application amount of the side sealant so that the side sealant is aligned with the side edge of the encapsulation cover plate.

[0010] When specifically setting the OLED display device provided in the present application, in order to avoid interference between the encapsulation cover plate and the side plate during assembly, it is possible to set an avoidance gap between the encapsulation cover plate and the side plate along the direction from the encapsulation cover plate to the side plate.

[0011] In a second aspect, the present application provides a display terminal, including any one of the OLED display devices provided by the technical solutions in the first aspect above. Specifically, in the OLED display device provided in the present application, side sealant is used in combination with caulking adhesive and transition connecting adhesive for waterproof sealing, and the support structure corresponding to this part of the OLED screen can be cancelled on the middle frame side plate, so that the black edge size of the OLED screen can be effectively reduced, thereby improving the overall aesthetics of the device. At the same time, the OLED display device provided in the present application performs waterproof sealing of the whole machine through side sealant, caulking adhesive and transition connecting adhesive, which can ensure and improve the waterproof performance of the overall device.

[0012] In a third aspect, the present application provides a method for manufacturing an OLED display device, including:

[0013] At least apply side sealant to the side end face of the OLED screen in the head region, so that the side sealant bonds the side end face of the ultra-clean film laminated inside the OLED screen, the side end face of the display layer, and the part of the encapsulation cover plate exceeding the display layer towards the surface on the bottom plate side, for sealing the side end face of the OLED screen;

[0014] Apply back adhesive to the ultra-clean film or the bottom plate of the middle frame, so that the OLED screen is bonded to the bottom plate of the middle frame through the back adhesive;

[0015] Connect the middle frame and the OLED screen through caulking adhesive and transition connecting adhesive, so that the support structure of the side plate at least in the corresponding tail region is bonded to the OLED screen through caulking adhesive, and transition connecting adhesive is provided at each corner in the corresponding head region between the middle frame and the OLED screen, and the side sealant and the caulking adhesive are connected through the transition connecting adhesive. To achieve the overall sealing of the OLED display device, thereby improving the waterproof performance of the OLED display device.

[0016] In one possible implementation, the method for connecting the middle frame and the OLED screen through the transition connecting adhesive includes:

[0017] Before filling the caulking adhesive, a dam adhesive dispensing process is adopted to form a first dam and a second dam, so that there is a gap between the second dam and the first dam, and the first dam can connect the side sealant, the caulking adhesive and the back adhesive. The second dam is arranged on one side of the first dam close to the bottom area, and the second dam connects the caulking adhesive and the back adhesive;

[0018] After filling the caulking adhesive, glue is filled in the gap through an opening provided at the corresponding position of the bottom plate in the gap, so that the filled glue connects the side sealant, the first dam, the second dam, the back adhesive and the caulking adhesive. Description of the Drawings

[0019] Figure 1 is a structural diagram of an OLED display device adopted in the prior art;

[0020] Figure 2 is Figure 1 a cross-sectional view of the OLED display device at C' in

[0021] Figure 3 is a structural diagram of the OLED display device provided by the embodiment of the present application;

[0022] Figure 4 is Figure 3 a cross-sectional view of the OLED display device at C in

[0023] Figure 5 is Figure 3 another cross-sectional view of the OLED display device at C in

[0024] Figure 6 is another structural schematic diagram of the OLED display device provided by the embodiment of the present application;

[0025] Figure 7 is Figure 6 a cross-sectional view of the structure along the direction d in Detailed Embodiments

[0026] The OLED (organic light emitting diode) display device provided by the embodiment of the present application is applied to a common display terminal. Currently, the OLED display device 001 adopted in the prior art is as shown in Figure 1 shown. As shown in the structure shown in Figure 1 , the OLED screen 01 is bonded to the middle frame 03 through the back adhesive 02. At the same time, caulking adhesive 04 is dispensed around the middle frame 03 to fill the gap between the OLED screen 01 and the middle frame 03. In the OLED display device 001, the back adhesive 02 and the caulking adhesive 04 are used to achieve waterproof sealing between the OLED screen 01 and the middle frame 03.

[0027] Figure 2 isFigure 1 A cross-sectional view at C' in the middle. As Figure 2 shown in the structure, in order to apply the sealant 04 at points, a dispensing platform S' for the sealant 04 needs to be designed on the middle frame 03 (schematically separated by a dashed line). However, the dispensing platform S' will cause a relatively wide black edge width at the head of the OLED screen 01, affecting the aesthetic effect of the whole machine; and limited by the dispensing process ability of the sealant 04, glue overflow is likely to occur at the position of the dispensing platform S on the middle frame 03.

[0028] As Figure 1 and Figure 2 shown in the structure, when the prior art OLED display device 001 ensures the waterproof performance of the OLED screen, black edges will exist around the OLED screen 01, seriously affecting the aesthetics of the OLED display device 001. And when blindly pursuing to reduce the black edge of the OLED screen 01, it will lead to poor sealing of the OLED screen 01. It should be noted that liquid ingress into the OLED screen 01 will cause serious functional failure. Therefore, the waterproof design of the OLED screen is also crucial.

[0029] In view of this, an embodiment of the present application provides an OLED display device to ensure the waterproof sealing of the OLED screen while reducing the black edge of the OLED screen.

[0030] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include, for example, the expression form of "one or more", unless there is a clear contrary indication in the context.

[0031] Reference to "one embodiment" or "some embodiments" etc. described in this specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have" and their variants all mean "include but not limited to", unless otherwise specifically emphasized in other ways.

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0033] Figure 3 shows a structural diagram of the OLED display device provided by the embodiment of the present application. It should be understood thatFigure 3 The middle OLED display device 100 is shown in the form of a mobile phone, but is not limited thereto, and may also be in the form of other display terminals such as a tablet, a notebook, or a smart wearable device. Specifically, as Figure 3 shown in the structure, the OLED display device 100 provided in the embodiment of the present application includes a middle frame 1 and an OLED screen 2. Here, for introduction, according to the usage convention, the OLED display device 100 can be divided into a head region A and a tail region B, and the head region A and the tail region B are arranged along the direction d. Due to the structural characteristics of the OLED display device 100, there are two corner portions A1 in the head region A, and there are also two corner portions B1 in the tail region B. Of course, the head region A and the tail region B are not limited to the parts shown in the figure, and are only used as a schematic illustration here. Similarly, the corner portion A1 and the corner portion B1 are not limited to the parts shown in the figure, and are only used as a schematic illustration here.

[0034] Figure 4 For Figure 3 the middle OLED display device 100 is a cross-sectional view at C. As Figure 4 shown in the structure, the middle frame 1 includes a bottom plate 11 and side plates 12 located on the periphery of the bottom plate 11, and the middle frame 1 supports the OLED screen 2 through a support structure at least located in the tail region B. It should be understood that here, in order to clearly show the structures of the bottom plate 11 and the side plates 12, a schematic separation is made with a dotted line. The OLED screen 2 includes a super clean foam (SCF) 21, a display layer 22, and a packaging cover plate 23 that are stacked. Along the extension direction of the OLED screen 2, the packaging cover plate 23 partially extends beyond the display layer 22 and the super clean film 21 to form a protection for the display layer 22 and the super clean film 21. It should be understood that the packaging cover plate 23 can be exemplarily set as a glass cover plate. The display layer 22 may include multiple optical film layers or several display structures, which are not shown here. The super clean film 21 plays a buffering role for the OLED screen 2.

[0035] It should be noted that the OLED screen 2 in the OLED display device 100 provided in the embodiment of the present application can be a flat screen as Figure 3 shown, and of course, the OLED screen 2 can also be a curved screen. When the OLED screen 2 is a flat screen, the support structure on the middle frame 1 can be a dispensing table S' as shown in the prior art. When the OLED screen 2 is a curved screen, the support structure on the middle frame can be support points formed by other parts of the middle frame 1 in the OLED display device 100.

[0036] Please refer to Figure 3 the structure shown in Figure 4, in the OLED display device 100 provided by the embodiment of the present application, the ultra-clean film 21 is bonded to the bottom plate 11 through the back glue 3. In other words, the OLED screen 2 is bonded to the middle frame 1 through the back glue 3. It should be noted that a waterproof sealing structure is also provided in the OLED display device 100 to achieve the waterproof sealing effect between the OLED screen 2 and the middle frame 1.

[0037] The specific design of the waterproof sealing structure is as follows: The caulking glue 4 is dot-applied on the support structure, and the caulking glue 4 is used to achieve the waterproof sealing between the middle frame 1 and the OLED screen 2 in this part; The side sealing glue 5 is dot-applied on the part of the OLED screen 2 corresponding to the head area A, so that the side end face of the ultra-clean film 21 and the display layer 22 and the side face of the encapsulation cover plate 23 facing the bottom plate 11 are bonded and sealed with the side sealing glue 5, and the side end face of the OLED screen in this part is sealed through the side sealing glue 5; The transition connecting glue 6 is formed in each corner A1 of the head area A, so that the transition connecting glue 6 is connected to the caulking glue 4 and the side sealing glue 5.

[0038] The caulking glue 4, the side sealing glue 5 and the transition connecting glue 6 form a complete sealing structure on the peripheral side of the OLED screen 2, thereby improving the waterproof performance of the entire OLED display device 100. It should be noted that since the side sealing glue 5 is used in cooperation with the caulking glue 4 and the transition connecting glue 6 in the OLED display device 100 provided by the present application to perform waterproof sealing, the support structure corresponding to this part of the OLED screen 2 can be cancelled on the side plate 12 of the middle frame 1, thereby effectively reducing the black edge size of the OLED screen 2, and thus improving the overall aesthetics of the device.

[0039] Of course, the side sealing glue 5 in the OLED display device 100 provided by the embodiment of the present application is not limited to Figure 3 the position set therein. When wanting to reduce the black edge between the head area A and the tail area B, the side sealing glue 5 can also extend to the area between the head area A and the tail area B. Specifically, in one specific implementation manner that can be achieved, the side sealing glue 5 can only extend unidirectionally to the area between the head area A and the tail area B; in another specific implementation manner that can be achieved, the side sealing glue 5 extends bilaterally to the area between the head area A and the tail area B. As for the length of the side sealing glue 5 extending from the head area A, it can be set according to requirements and will not be elaborated here.

[0040] In order to avoid interference between the encapsulation cover plate 23 and the side plate 12 during the assembly process, a clearance can be provided between the encapsulation cover plate 23 and the side plate 12. As Figure 4 shown in the structure, the clearance size between the encapsulation cover plate 23 and the side plate 12 in the direction d is L1. Exemplarily, the L1 is 0.1 mm.

[0041] Meanwhile, when applying the side sealant 5, the distance between the side sealant 5 and the edge of the encapsulation cover plate 23 can be controlled to have a certain spacing, so as to prevent the side sealant 5 from exceeding the edge of the encapsulation cover plate 23 and causing interference between the encapsulation cover plate 23 and the side plate 1 during the assembly process. Exemplarily, please continue to refer to Figure 4 the structure shown. Along the direction d, the dimension of the spacing between the side sealant 5 and the edge of the encapsulation cover plate 23 is L2. It should be noted that when applying the side sealant 5, the dimension thickness of the side sealant 5 in the direction d can be set as required to be L3.

[0042] It should be understood that the sum of the dimensions of L2 and L3 is the dimension by which the encapsulation cover plate 23 exceeds the display layer 22 in the direction d. Exemplarily, L2 can be set to 0.25 mm and L3 can be set to 0.35 mm. At this time, the dimension by which the encapsulation cover plate 23 exceeds the display layer 22 is 0.6 mm.

[0043] Of course, when applying the side sealant 5, the application amount of the side sealant 5 can also be controlled so that the side sealant 5 is aligned with the side edge of the encapsulation cover plate 23, and the value of L2 is set to 0, as specifically shown in Figure 5 the structure shown.

[0044] It should be noted that the black edge of the OLED screen 2 includes not only the part where the encapsulation cover plate 23 exceeds the display layer 22 and the gap between the encapsulation cover plate 23 and the side plate 12, but also the non-display area where the OLED screen 2 does not play a display role. Specifically, the OLED screen 2 includes a display area for display and a non-display area located on the periphery of the display area. As shown in Figure 5 the structure shown, the non-display area is the part between the display area indicated by L4 and the edge of the display layer 22.

[0045] Generally speaking, the total width of the black edge of the OLED screen 2 in the OLED display device 100 provided by the present application is equal to the sum of the dimensions of L1, L2, L3, and L4. Exemplarily, when L1 is set to 0.1 mm, L2 is set to 0.25 mm, L3 is set to 0.35 mm, and L4 is set to 0.88 mm, the total width of the black edge of the OLED screen 2 in the OLED display device 100 provided by the present application is 1.58 mm. As shown in Figure 2 the structure of the existing OLED display device 001 shown in the prior art, the total width of the black edge is 2.08 mm. Compared with this prior art, the OLED display device 100 provided by the present application can effectively reduce the black edge size of the OLED screen 2, thereby improving the overall aesthetics of the device.

[0046] Figure 6 This is a schematic structural diagram of the OLED display device 100 provided by the embodiment of the present application after removing the OLED screen 2. As shown in Figure 6In the structure shown, taking a corner A1 as an example, the transition connecting glue 6 includes a dam structure 61 provided at the corner A1 and a glue filling 62. The dam structure 61 includes a first dam 611 and a second dam 612. There is a gap between the first dam 611 and the second dam 612, and the glue filling 62 is filled in this gap. Specifically, the first dam 611 is connected to the side seal glue 5, the caulking glue 4, and the back glue 3; the second dam 612 is provided on the side of the first dam 611 away from the side seal glue 5, and the second dam 612 is connected to the caulking glue 4 and the back glue 2. It should be noted that the side seal glue 5 can partially extend into the gap filled with the glue filling 62 to improve the sealing and waterproof performance of the OLED display device 100 provided by the embodiment of the present application.

[0047] Of course, when specifically setting the transition connecting glue 6 structure in the two corners A1, the transition connecting glue 6 structures in the two corners A1 can be set to be the same or similar. Similarly, the setting positions of the transition connecting glue 6 in the two corners A1 can be symmetrically arranged about the central axis of the OLED screen 2 in the direction d. Or, the transition connecting glue 6 in the two corners A1 can also be approximately symmetric or asymmetric about the central axis of the OLED screen 2 in the direction d according to requirements.

[0048] Figure 7 For Figure 6 a cross-sectional view of the structure along the direction d. As Figure 7 shown in the structure, the bottom plate 11 is provided with a glue filling hole E for filling the glue filling 62 at the part corresponding to the gap filled with the glue filling 62.

[0049] Please combine Figure 6 and refer to Figure 7 the structure shown in

[0050] At least apply the side seal glue 5 to the side end surface of the OLED screen 2 in the head area A, so that the side seal glue 5 adheres to the side end surfaces of the super-clean film 21, the display layer 22, and the part of the encapsulation cover plate 23 that exceeds the display layer 22 and is laminated inside the OLED screen 2 and faces the surface on the side of the bottom plate 11 to seal the side end surface of the OLED screen 2;

[0051] Apply the back glue 3 to the super-clean film 21 or the bottom plate 11 of the middle frame 1, so that the OLED screen 2 adheres to the bottom plate 11 of the middle frame 1 through the back glue 3;

[0052] The middle frame 1 and the OLED screen 2 are connected by the caulking adhesive 4 and the transition connecting adhesive 6, so that the support structure of the side plate 12 at least in the corresponding tail region B is bonded to the OLED screen 2 by the caulking adhesive 4, and a transition connecting adhesive 6 is provided at each corner A1 in the corresponding head region A between the middle frame 1 and the OLED screen 2. The side sealant 5 and the caulking adhesive 4 are connected by the transition connecting adhesive 6. To achieve the overall sealing of the OLED display device 100, thereby improving the waterproof performance of the OLED display device 100.

[0053] Now, a specific operation process for manufacturing the OLED display device 100 provided in the embodiments of the present application is provided, as follows by way of example:

[0054] Dam adhesives are applied on both sides of the glue injection hole E of the middle frame 1 to form a dam structure 61 to prevent glue overflow during the filling of the glue injection 62; the caulking adhesive 4 is applied to the part outside the head region A of the middle frame 1.

[0055] Next, the OLED screen 2 with the side sealant 5 already applied to the head is assembled onto the middle frame 1, so that the first dam 611 connects the side sealant 5, the caulking adhesive 4, and the back adhesive 3. At the same time, the second dam 612 connects the caulking adhesive 4 and the back adhesive 2.

[0056] Finally, glue is poured through the glue injection hole E on the back of the middle frame 1 to form the glue injection 62. The glue injection 62 effectively bonds the caulking adhesive 5, the dam structure 61, and the back adhesive 3 together to form a sealed waterproof space, thereby improving the waterproof and sealing performance of the OLED display device 100 provided in the embodiments of the present application.

[0057] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An OLED display device, the OLED display device having a head region and a tail region, characterized in that, The OLED display device includes: a middle frame and an OLED screen, wherein: The middle frame includes a bottom plate and a side plate located on one side of the bottom plate. The side plate is provided with a support structure for supporting the OLED screen at least in a part corresponding to the tail region. The OLED screen is bonded to the support structure by a caulking adhesive. The OLED screen includes a super-clean film, a display layer, and a packaging cover plate which are stacked. The super-clean film is bonded to the bottom plate by a back adhesive. Along the extending direction of the OLED screen, the packaging cover plate extends beyond the display layer. The OLED screen is provided with a side sealant at least in a part corresponding to the head region. The side sealant bonds the side end faces of the super-clean film, the side end faces of the display layer, and the surface of the packaging cover plate facing the bottom plate of the middle frame. The OLED display device has two corners in the head region and two corners in the tail region. At the position of each corner in the head region: a transition connection adhesive is provided between the middle frame and the OLED screen, and the transition connection adhesive connects the side sealant and the caulking adhesive.

2. The OLED display device according to claim 1, characterized in that, The transition connection adhesive in at least one of the corners includes a dam structure and a potting adhesive. The dam structure includes a first dam and a second dam, and there is a gap between the second dam and the first dam. The first dam connects the side sealant, the caulking adhesive, and the back adhesive. The second dam is provided on the side of the first dam close to the tail region, and the second dam connects the caulking adhesive and the back adhesive. The potting adhesive fills the gap.

3. The OLED display device according to claim 2, characterized in that, The bottom plate is provided with a potting hole for filling the potting adhesive at a part corresponding to the gap.

4. The OLED display device according to claim 1, characterized in that, The vertical projection of the packaging cover plate on the bottom plate covers the vertical projection of the side sealant on the bottom plate.

5. The OLED display device according to claim 4, characterized in that, Along the extending direction of the packaging cover plate, there is a spacing between the side sealant and the edge of the packaging cover plate.

6. The OLED display device according to any one of claims 1-5, characterized in that, Along the direction from the packaging cover plate to the side plate, there is an avoidance gap between the packaging cover plate and the side plate.

7. A display terminal, characterized in that, An OLED display device according to any one of claims 1-6.

8. A method for manufacturing an OLED display device, the OLED display device having a head region and a tail region; the OLED display device comprising: a middle frame and an OLED screen; characterized in that, The manufacturing method includes: Applying a side sealant at least on the side end face of the OLED screen in the head region, so that the side sealant bonds the side end faces of the super-clean film and the display layer stacked inside the OLED screen, and the part of the packaging cover plate extending beyond the display layer facing the surface of the bottom plate of the middle frame, to seal the side end face of the OLED screen. Applying a back adhesive on the super-clean film inside the OLED screen or the bottom plate of the middle frame, so that the OLED screen is bonded to the bottom plate of the middle frame by the back adhesive. Connecting the middle frame and the OLED screen by a caulking adhesive and a transition connection adhesive, so that the support structure of the side plate of the middle frame at least in the part corresponding to the tail region is bonded to the OLED screen by the caulking adhesive, and a transition connection adhesive is provided at each corner part of the middle frame and the OLED screen in the corresponding head region, so that the transition connection adhesive connects the side sealant and the caulking adhesive.

9. The manufacturing method according to claim 8, characterized in that, The method of connecting the middle frame and the OLED screen by a caulking adhesive and a transition connection adhesive includes: Before filling the sealant, a dam glue dispensing process is adopted to form a first dam and a second dam, so that there is a gap between the second dam and the first dam, and the first dam can connect the side sealant, the sealant and the back glue. The second dam is arranged on one side of the first dam close to the tail region, and the second dam connects the sealant and the back glue; After filling the sealant, glue is filled in the gap through an opening provided in the bottom plate corresponding to the gap position, so that the filled glue connects the side sealant, the first dam, the second dam, the back glue and the sealant.

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