Flexible OLED (Organic Light Emitting Diode) screen curling and packaging structure

Abstract

The invention relates to the technical field of flexible light-emitting devices, in particular to a flexible OLED screen curl packaging structure which comprises a substrate, a first electrode layer, a light-emitting function layer, a second electrode layer and a protective layer, the substrate, the first electrode layer, the light-emitting function layer, the second electrode layer and the protective layer are sequentially distributed, a filler cavity is formed in the protective layer, and the filler cavity is filled with a filling material. A filler is arranged in the filler cavity, and catalysts are arranged on the portions, located on the two sides of the filler cavity, of the base plate. According to the invention, the filler cavity is arranged and the catalyst is arranged between the protective layer and the substrate, so that when the edge of the OLED screen is torn, the filler in the filler cavity flows out and is in contact with the catalyst so as to repair side packaging, thereby avoiding the problem that internal electronic components are damaged due to contact with air due to edge tearing of the OLED screen; therefore, the service life of the OLED screen is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of flexible light-emitting device technology, specifically a flexible OLED screen roll-up packaging structure. Background Technology

[0002] Flexible OLED screens are highly flexible, thin, and space-saving, making them suitable for rolling up and storing. This allows them to function as storage screens for projection screens, making them easy to move and store, while also providing the advantage of clear screen display.

[0003] When flexible OLED screens are rolled up for storage, their sides are prone to stress fatigue and tearing. Since the electrode and light-emitting materials of OLED screens are sensitive to oxygen and moisture, tearing at the side exposes these materials to direct contact, leading to damage. To address this, patent application CN202010804565.0 provides a flexible thin-film encapsulated OLED structure and manufacturing method. This patent increases the height of the internal isolation wall from the inside out, and combines organic and inorganic thin film layers to form a stepped groove structure that allows the OLED component to be placed inside. This allows the organic and inorganic films to bond effectively, improving their adhesion and thus extending the lifespan of the flexible OLED screen. However, while this patent slows down the time it takes for the flexible OLED screen to tear, it still cannot completely prevent the reduced lifespan caused by stress fatigue tearing.

[0004] Therefore, in order to improve the lifespan of flexible OLED screens, a flexible OLED screen roll-up packaging structure is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible OLED screen roll-up packaging structure. In order to improve the service life of the flexible OLED screen, a liquid filler is provided between the protective layer and the substrate. When the flexible OLED screen is torn, the liquid filler enters the torn part of the flexible OLED screen and contacts the catalyst to achieve the repair of the flexible OLED screen. In this way, after the flexible OLED screen is torn, air is prevented from contacting the electrode material and light-emitting material of the flexible OLED screen, thereby improving the service life of the flexible OLED screen.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A flexible OLED screen roll-up packaging structure includes a substrate, a first electrode layer, a light-emitting functional layer, a second electrode layer, and a protective layer. The substrate, the first electrode layer, the light-emitting functional layer, the second electrode layer, and the protective layer are distributed sequentially. A filling cavity is formed on the protective layer, and a filler is provided inside the filling cavity. Catalysts are provided on both sides of the substrate located in the filling cavity.

[0008] By setting up a filler cavity and placing a catalyst between the protective layer and the substrate, when the edge of the OLED screen tears, the filler inside the filler cavity flows out and comes into contact with the catalyst, thereby repairing the side seal. This avoids the problem of internal electronic components being damaged by contact with air due to edge tearing of the OLED screen, thus effectively improving the service life of the OLED screen.

[0009] Preferably, the substrate is provided with partitions on both sides of the filling cavity, and the partitions on both sides are inclined toward one side of the filling cavity.

[0010] By using partitions, the protective layer can be prevented from tearing continuously, thus avoiding the problem of filler entering the electronic components and causing damage due to complete tearing of the side package. The partitions are tilted in different directions, so that the adhesive layers on both sides of the partition will be subjected to different bending stresses when subjected to bending stress. This avoids the problem of the protective layers on both sides of the filler cavity tearing at the same time, causing air to quickly enter the side package before the protective layer is fully repaired, resulting in damage to the internal electronic components due to contact with air. This further avoids the problem of filler entering the electronic components and causing damage due to complete tearing of the side package.

[0011] Preferably, the substrate is provided with an elastic airbag, the elastic airbag extends into the filling cavity and is in a compressed state, and the substrate is provided with an exhaust port communicating with the elastic airbag.

[0012] By incorporating elastic airbags, the internal space of the filler cavity can be adjusted when the OLED screen deforms due to curling. This prevents the filler from being squeezed during winding, which could increase internal pressure and cause the protective layer to tear at the filler cavity. This further extends the lifespan of the OLED screen. The elastic airbags, being in a compressed state, can expel the filler when the protective layer tears, creating a positive pressure inside the filler cavity. This allows for rapid discharge of filler when the protective layer tears, preventing air from entering the filler cavity and causing filler deterioration. Furthermore, when the protective layer tears on the side near the electronic components, air can then flow from the filler cavity into the protective layer, further enhancing the protection of the internal electronic components and extending the lifespan of the OLED screen.

[0013] Preferably, the substrate is provided with a control airbag, the control airbag is connected to the elastic airbag through an exhaust port, and the control airbag is provided with a gravity-type one-way valve.

[0014] By controlling the airbag settings and incorporating a gravity-operated one-way valve, the gravity-operated one-way valve is deactivated during the OLED screen winding process. This allows the elastic airbag to expel internal gas when compressed, preventing the packing cavity from deforming and compressing the packing during winding, thus avoiding the problem of increased stress on the protective layer and easy tearing. When the OLED screen is winding or unfolding, the gravity-operated one-way valve operates normally, ensuring that the elastic airbag only absorbs the gas inside the control airbag when it expands. Therefore, when the edge of the OLED screen tears, the elastic airbag recovers and compresses the packing, expelling the packing. When the internal air pressure of the control airbag equals the internal air pressure of the elastic airbag, the elastic airbag cannot deform, thus ceasing to compress the packing. Therefore, when the edge of the OLED screen tears, the continuous discharge of packing is avoided, allowing the packing to be repaired multiple times during OLED screen side sealing, effectively improving the lifespan of the OLED screen.

[0015] Preferably, a receiving groove is provided between the substrate and the protective layer, and a catalyst is provided on the side wall of the receiving groove.

[0016] By setting up a receiving groove, excess filler can be accommodated when the protective layer is torn and discharged to the edge of the protective layer. When the filler comes into contact with the catalyst, the filler solidifies, thereby preventing the filler from overflowing onto the surface of the OLED screen and affecting the display effect of the OLED screen. It also prevents the OLED screen from being torn and damaged when it is rolled up due to the filler overflowing and sticking together.

[0017] Preferably, the protective layer is made by coating, the substrate is provided with an injection tube, the injection tube is attached to the elastic airbag, and the elastic airbag is coated with an anti-sticking agent to prevent the protective layer from sticking.

[0018] The protective layer is made by coating, and the filling cavity can be made by expanding elastic air bladders, which makes the production of the protective layer simpler. After the protective layer is made, the elastic air bladders are completely attached to the protective layer, so that there is no air inside the filling cavity. Therefore, it can avoid the problem of filling deterioration caused by the presence of air after filling, which affects the sealing effect of filling, thus effectively improving the service life of OLED screens.

[0019] Preferably, one end of the elastic airbag extends into the interior of the injection tube, the width of the elastic airbag gradually increases from one side of the injection tube to the other, the injection tube is located on the side with the larger curl radius of the protective layer, and a catalyst is provided inside the injection tube.

[0020] By extending one end of the elastic airbag into the injection tube, the problem of blockage of the injection tube during the manufacturing process of the protective layer can be avoided. The width of the elastic airbag gradually increases from one side of the injection tube to the other, and the injection tube is located on the side with the larger curl radius of the protective layer. When the filler is injected into the injection tube, the elastic airbag on this side is compressed by the filler pressure. This allows the elastic airbag to generate a component force perpendicular to the surface of the protective layer when it separates from the protective layer, making it easier for the elastic airbag to separate from the protective layer. Thus, even with a lower injection pressure, the elastic airbag and the protective layer can be kept in place, avoiding damage to the film layer caused by excessive injection pressure. The injection tube also contains a catalyst, so the injection tube can achieve self-sealing through the residual filler on the inner wall of the injection tube, making the encapsulation process simpler and effectively reducing manufacturing costs.

[0021] Preferably, the catalyst is adsorbed onto the substrate by chemical adsorption, and the catalyst surface is treated with a sandblasting process.

[0022] The catalyst is adsorbed onto the substrate by chemical adsorption, which can improve the adhesion between the catalyst and the substrate and prevent the catalyst from detaching from the substrate under bending stress, thereby effectively extending the lifespan of the OLED screen. Furthermore, the catalyst surface is frosted to improve the connection strength between the protective layer and the substrate, further extending the lifespan of the OLED screen.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. By introducing liquid filler into the torn area of ​​the flexible OLED screen when it tears, and allowing it to contact the catalyst, the flexible OLED screen can be repaired. This prevents air from contacting the electrode and light-emitting materials of the flexible OLED screen after it tears, thereby improving the lifespan of the flexible OLED screen.

[0025] 2. The elastic airbag design prevents the filler from being squeezed during winding, which could increase the internal pressure of the filler cavity and cause it to act on the protective layer, thus preventing the protective layer from tearing at the filler cavity. This further improves the lifespan of the OLED screen. The elastic airbag can also squeeze the filler out, thus keeping the inside of the filler cavity under positive pressure. This allows the filler to be quickly discharged when the protective layer tears, preventing air from entering the filler cavity. This not only prevents the air from deteriorating the filler but also prevents the air from coming into contact with the electrode and light-emitting materials of the flexible OLED screen, further improving the lifespan of the flexible OLED screen.

[0026] 3. By controlling the airbag settings and incorporating a gravity-type one-way valve, the gravity-type one-way valve fails during the OLED screen winding process. At this time, the elastic airbag can release air, preventing the increased pressure inside the filler cavity from acting on the protective layer and causing it to tear easily. At the OLED screen unfolding opening, the control airbag cannot draw in air. Therefore, when the edge of the OLED screen tears, the elastic airbag expands until the air pressure of the control airbag and the elastic airbag is equal, at which point the expansion stops. This controls the expansion amount of the elastic airbag, preventing the continuous discharge of filler. As a result, the filler can be repaired multiple times for the OLED screen side sealing, effectively improving the service life of the OLED screen. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention with the protective layer removed;

[0029] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0030] Figure 4 for Figure 1 Sectional view at point BB;

[0031] Figure 5 for Figure 4 Sectional view at point CC;

[0032] Figure 6 for Figure 5 Enlarged view of a section at point D;

[0033] Figure 7 for Figure 5 Enlarged view of a section at point E in the middle.

[0034] In the figure: 1. Substrate; 2. First electrode layer; 3. Light-emitting functional layer; 4. Second electrode layer; 5. Protective layer; 6. Filler cavity; 7. Filler; 8. Catalyst; 9. Separator; 10. Elastic airbag; 11. Exhaust port; 12. Control airbag; 13. One-way valve; 14. Receiving tank; 15. Injection pipe. Detailed Implementation

[0035] Please see Figures 1 to 7 This invention provides a flexible OLED screen roll-up packaging structure, the technical solution of which is as follows:

[0036] A flexible OLED screen roll-up packaging structure, see reference. Figures 1 to 7The system includes a substrate 1, on which a first electrode layer 2, a light-emitting functional layer 3, a second electrode layer 4, and a protective layer 5 are sequentially disposed. The protective layer 5 is fabricated by coating with resin. An elastic air bladder 10 and an exhaust port 11 are disposed on the substrate 1, with the exhaust port 11 communicating with the elastic air bladder 10. During fabrication, the protective layer 5 is formed by coating it onto the substrate 1. When the elastic air bladder 10 contracts, a filling cavity 6 is formed inside the protective layer 5. An injection tube 15 is disposed on the substrate 1, which contacts the elastic air bladder 10. By injecting filler 7 into the injection tube 15, the elastic air bladder 10 is compressed, causing the filler 7 to be stored inside the filling cavity 6. Catalysts 8 are provided on both sides of the filler cavity 6 on the substrate 1. When the side of the flexible OLED screen tears, the filler 7 can enter the tear and contact the catalyst 8, thereby repairing the side of the flexible OLED screen. Therefore, even when the side of the flexible OLED screen is torn, air can still be prevented from contacting the electrode material and light-emitting material of the flexible OLED screen, thus improving the service life of the flexible OLED screen. The protective layer 5 is made by coating and can form the filler cavity 6 by injecting the filler 7 after its fabrication. Therefore, the fabrication is simple and the manufacturing cost is low. After the protective layer 5 is fabricated, the elasticity is... The airbag 10 fits perfectly against the protective layer 5, ensuring no air is present inside the filling cavity 6. This prevents the filling 7 from deteriorating due to air after injection, thus improving its sealing performance and effectively extending the lifespan of the OLED screen. Furthermore, the elastic airbag 10 adjusts the internal space of the filling cavity 6 when the OLED screen deforms due to curling, preventing the filling 7 from being compressed during winding. This prevents increased pressure inside the filling cavity 6 from acting on the protective layer 5, which could easily tear it at the filling cavity 6, further improving the OLED screen's lifespan. After the filling 7 is injected... The elastic airbag 10 can contract, and when the protective layer 5 is torn, the elastic airbag 10 can squeeze the filler 7 out, thus putting the inside of the filler cavity 6 under positive pressure. This allows the filler 7 to be quickly discharged when the protective layer 5 is torn, preventing air from entering the filler cavity 6 and causing deterioration of the filler 7. When the protective layer 5 is torn on the side of the electronic component, air can then enter the interior of the protective layer 5 from the filler cavity 6, thereby further improving the protection effect on the internal electronic components and increasing the lifespan of the OLED screen. One end of the elastic airbag 10 extends into the injection tube 15.During the fabrication of the protective layer 5, the material of the protective layer 5 can be prevented from entering the injection tube 15 and causing blockage. After the filling material 7 is injected, the elastic airbag 10 expands to block the injection tube 15, preventing air from entering the filling cavity 6. The injection tube 15 is also equipped with a catalyst 8. Therefore, the injection tube 15 can achieve self-sealing through the residual filling material 7 on the inner wall of the injection tube 15, making the encapsulation process simpler and effectively reducing manufacturing costs. The width of the elastic airbag 10 gradually increases from one side of the injection tube 15 to the other, which can reduce the contact area between the elastic airbag 10 and the protective layer 5 on one side of the injection tube 15. When the filling material 7 is injected into the injection tube 15, the elastic airbag 10 on that side is compressed by the pressure of the filling material 7, thereby making the elastic airbag... When the elastic airbag 10 separates from the protective layer 5, the reduced contact area makes it easier for the elastic airbag 10 to tear apart from the protective layer 5. This allows the elastic airbag 10 to generate a force perpendicular to the surface of the protective layer 5 when it detaches, further facilitating separation. This ensures the elastic airbag 10 remains in contact with the protective layer 5 even at lower injection pressures, preventing damage to the film layer caused by excessive injection pressure. During the application of the protective layer 5, an anti-sticking agent made of polytetrafluoroethylene (PTFE) is applied to the elastic airbag 10 to prevent resin adhesion, thus facilitating separation and reducing the injection pressure of the filler 7, further preventing damage to the film layer caused by excessive injection pressure.

[0037] See Figures 4 to 7A control airbag 12 is provided on the substrate 1, and a gravity-type one-way valve 13 is provided on the control airbag 12. An elastic airbag 10 is connected to the control airbag 12 through an exhaust port 11. When the OLED screen is fully unfolded or fully rolled up, the one-way valve 13 exhausts gas in one direction due to gravity. Therefore, when the edge of the OLED screen tears, the elastic airbag 10 expands and absorbs the gas inside the control airbag 12, causing the control airbag 12 to contract. As the elastic airbag 10 expands, the internal pressure of the elastic airbag 10 and the control airbag 12 can no longer overcome the elastic force of the control airbag 12 to continue contracting, and the elastic airbag 10 stops expanding. Therefore, it no longer squeezes the filler 7. Thus, when the edge of the OLED screen tears, the continuous discharge of the filler 7 can be avoided, so that the filler 7 can be repaired multiple times by side encapsulation of the OLED screen, effectively improving the service life of the OLED screen. During the rolling or unfolding process of the OLED screen, the direction of the one-way valve 13 changes and loses its one-way function. Therefore, the elastic airbag 10 can expand and be used in the process of being rolled up or unfolded. The material can shrink during compression, preventing the filler 7 from being squeezed during winding, which would increase the internal pressure of the filler cavity 6 and affect the protective layer 5, thus preventing the protective layer 5 from tearing at the filler cavity 6. This further improves the lifespan of the OLED screen. A receiving groove 14 is provided between the substrate 1 and the protective layer 5, and a catalyst 8 is provided on the side wall of the receiving groove 14. By providing the receiving groove 14, when the protective layer 5 is torn and discharged to the edge of the protective layer 5, excess filler 7 can be accommodated. When the filler 7 comes into contact with the catalyst 8, the filler 7 solidifies, thereby preventing the filler 7 from overflowing onto the surface of the OLED screen and affecting the display effect of the OLED screen. It also prevents the OLED screen from being torn and damaged when the filler 7 overflows and adheres to each other during winding. The side wall of the receiving groove 14 can also form a side seal perpendicular to the connection between the protective layer 5 and the substrate 1, thereby further improving the adhesion between the protective layer 5 and the substrate 1 and further improving the lifespan of the OLED screen.

[0038] See Figure 4On the substrate 1, partitions 9 are respectively provided on both sides of the filling cavity 6. The partitions 9 can prevent the protective layer 5 from tearing continuously, thus avoiding the problem of the filler 7 entering the electronic components and causing damage to the electronic components due to complete tearing of the side package. The two partitions 9 are inclined towards one side of the filling cavity 6. The inclination of the partitions 9 and the different inclination directions can make the adhesive layer on both sides of the partition 9 subject to different bending stresses when subjected to bending stress. This can prevent the protective layer 5 on both sides of the filling cavity 6 from tearing at the same time, so that when the protective layer 5 is not completely repaired, air can quickly enter the side package and cause damage to the internal electronic components due to contact with air. This further avoids the problem of the filler 7 entering the electronic components and causing damage to the electronic components due to complete tearing of the side package. The filler 7 is made of polyurethane resin, and the catalyst 8 is made of tin salt metal catalyst 8. The curing of polyurethane resin is usually completed by the reaction between isocyanate groups and polyols. In this process, the tin salt metal catalyst 8 can promote the occurrence of amino chemical reaction, shorten the curing time, improve the degree of crosslinking, and the polyurethane resin has high transparency after curing. The catalyst 8 is chemical The catalyst 8 is adsorbed onto the substrate 1 via adsorption. The specific steps are as follows: First, the surface of substrate 1 is cleaned with ethanol to remove oil, dust, and other impurities. Then, the surface of substrate 1 is activated by plasma. After cleaning, substrate 1 is immersed in a tin salt solution. The metal ions in the salt solution react chemically with the active sites on the surface of substrate 1, thus adsorbing onto the substrate 1 surface. Substrate 1 is then dried and subjected to heat treatment at 300℃. After heat treatment, the surface of catalyst 8 is sanded. Using chemical adsorption to attach catalyst 8 to substrate 1 improves the adhesion between catalyst 8 and substrate 1, preventing catalyst 8 from detaching from substrate 1 under bending stress, thereby effectively extending the lifespan of the OLED screen. Sanding the surface of catalyst 8 also improves the connection strength between the protective layer 5 and substrate 1, further extending the lifespan of the OLED screen. The heat treatment temperature of 300℃ helps improve the catalytic activity of tin and enhances the bonding force between catalyst 8 and substrate 1. Within this temperature range, tin salt begins to undergo thermal decomposition or oxidation, forming a stable metal oxide.

[0039] Working principle: See Figures 1 to 7When the OLED screen tears due to stress fatigue during unfolding or rewinding, the elastic airbag 10 expands and squeezes the filler 7 to be discharged along the tear. However, when the OLED screen is fully unfolded or rewound, the one-way valve 13 can only vent air, not allow it to enter. The internal pressure of the elastic airbag 10 and the control airbag 12 is insufficient to overcome the elasticity of the control airbag 12, causing the elastic airbag 10 to stop expanding. At this point, the filler 7 stops discharging, and the discharged filler 7 enters the tear in the OLED screen and comes into contact with the catalyst 8. This allows the filler 7 to repair the tear in the OLED screen, preventing air from contacting the electrode and light-emitting materials of the flexible OLED screen, thereby improving flexibility. The lifespan of the OLED screen is extended, and excess overflowing filler 7 enters the receiving groove 14 and contacts the catalyst 8 in the receiving groove 14 to form a side seal. When the OLED screen is unfolded or rolled up, the direction of the one-way valve 13 changes continuously, allowing the one-way valve 13 to perform air intake and exhaust. Therefore, when the volume of the filling cavity 6 changes when the OLED screen is unfolded or rolled up, the elastic airbag 10 can contract and expand, thereby avoiding the generation of negative pressure inside the filling cavity 6 on the protective layer 5. This avoids the problem that the protective layer 5 is easily torn from the filling cavity 6 due to stress fatigue inside the filling cavity 6, thus further improving the lifespan of the OLED screen.

[0040] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A flexible OLED screen roll-up packaging structure, characterized in that, The material includes a substrate (1), a first electrode layer (2), a light-emitting functional layer (3), a second electrode layer (4), and a protective layer (5). The substrate (1), the first electrode layer (2), the light-emitting functional layer (3), the second electrode layer (4), and the protective layer (5) are arranged in sequence. A filling cavity (6) is formed on the protective layer (5). Liquid filler (7) is provided inside the filling cavity (6). Catalysts (8) are provided on both sides of the substrate (1) located in the filling cavity (6).

2. The flexible OLED screen roll-up packaging structure according to claim 1, characterized in that, The substrate (1) is provided with partitions (9) on both sides of the filling cavity (6), and the partitions (9) on both sides are inclined to one side of the filling cavity (6).

3. The flexible OLED screen roll-up packaging structure according to claim 2, characterized in that, The substrate (1) is provided with an elastic airbag (10), the elastic airbag (10) extends into the filling cavity (6) and the elastic airbag (10) is in a compressed state, and the substrate (1) is provided with an exhaust port (11) communicating with the elastic airbag (10).

4. The flexible OLED screen roll-up packaging structure according to claim 3, characterized in that, The base plate (1) is provided with a control airbag (12), which is connected to the elastic airbag (10) through an exhaust port (11). The control airbag (12) is provided with a gravity-type one-way valve (13).

5. The flexible OLED screen roll-up packaging structure according to claim 1, characterized in that, A receiving groove (14) is provided between the substrate (1) and the protective layer (5), and a catalyst (8) is provided on the side wall of the receiving groove (14).

6. The flexible OLED screen roll-up packaging structure according to claim 3, characterized in that, The protective layer (5) is made by coating. The substrate (1) is provided with an injection tube (15). The injection tube (15) is attached to the elastic airbag (10). The elastic airbag (10) is coated with an anti-sticking agent to prevent the protective layer (5) from sticking.

7. The flexible OLED screen roll-up packaging structure according to claim 6, characterized in that, One end of the elastic airbag (10) extends into the inside of the injection tube (15). The width of the elastic airbag (10) gradually increases from one side to the other side of the injection tube (15). The injection tube (15) is located on the side with a large curling radius of the protective layer (5). The injection tube (15) is provided with a catalyst (8).

8. The flexible OLED screen roll-up packaging structure according to claim 1, characterized in that, The catalyst (8) is adsorbed onto the substrate (1) by chemical adsorption, and the surface of the catalyst (8) is treated with sanding.

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