Display screen laminating process and display screen

Abstract

The invention discloses a display screen laminating process and a display screen, and the display screen laminating process comprises the steps that a display panel and a protection panel are arranged, laminating glue is attached to the opposite surfaces of the display panel and the protection panel to form an initial panel assembly, and the laminating glue is a UV curing type optical glue film; the initial panel assembly is pressurized and defoamed, and a middle panel assembly is formed; and after pressurization defoaming is completed, the middle panel assembly is cured. The display screen is manufactured by the laminating process. The display panel and the protection panel are attached through the TOCA optical adhesive film, a vacuumizing step is not set in the manufacturing process of the display screen, the attaching yield and the manufacturing efficiency of the display screen are not affected by the vacuumizing speed, the manufacturing efficiency of the display screen is improved due to the fact that the vacuumizing step is omitted, the panel cannot deform due to vacuumizing, and the manufacturing quality of the display screen is improved. And the risk of liquid crystal leakage is reduced, poor lamination caused by the defects of the colloid can be overcome, and the lamination yield of the display screen is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display device preparation, and in particular to a display screen lamination process and a display screen. Background Art

[0002] The traditional lamination process typically places a colloid between the two panels to be bonded, followed by a vacuum process to expel the air between the two panels. This is especially true for large or curved panels, as vacuuming can prevent bubbles from forming during the initial bonding, which can lead to defects such as panel delamination and Newton rings. However, this vacuuming method is only suitable for displays of conventional thickness. For thinner displays, such as ultra-thin flexible screens and thin rigid screens, the vacuuming speed is too fast, and the pressure in the cavity changes rapidly, which can easily cause liquid crystal leakage. After the display is turned on, these leaking points appear as yellow spots, affecting the bonding quality. However, if the vacuuming speed is too slow, the bonding efficiency is affected, increasing the production cost of the display. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a display screen lamination process that can improve the lamination quality and lamination efficiency of the display screen.

[0004] The present invention also provides a display screen manufactured by the above display screen bonding process.

[0005] The display screen laminating process according to the first embodiment of the present invention includes: Arrange a display panel and a protective panel, and adhere bonding adhesive to the opposite surfaces of the two to form an initial panel assembly, wherein the bonding adhesive is a UV curable optical adhesive film; Pressurizing and degassing the initial panel assembly to form an intermediate panel assembly; After the pressure degassing is completed, the middle panel assembly is cured.

[0006] The display screen laminating process according to the embodiment of the present invention has at least the following beneficial effects: The present invention adheres the display panel and the protective panel by using TOCA optical adhesive film. No vacuuming step is provided in the production process of the display screen. The bonding yield and the production efficiency of the display screen are not affected by the vacuuming rate. Since the vacuuming step is omitted, the production efficiency of the display screen is improved, and the panel will not be deformed due to vacuuming, and the risk of liquid crystal leakage is reduced, thereby improving the bonding yield of the display screen.

[0007] According to some embodiments of the present invention, before the pressurized degassing step is performed, the initial panel assembly is pressed to close the edge between the display panel and the protection panel.

[0008] According to some embodiments of the present invention, during the lamination step, pressure and heat are simultaneously applied to the initial panel assembly, and the laminating adhesive is converted into a molten state and flows between the display panel and the protective panel.

[0009] According to some embodiments of the present invention, in the laminating step, pressure is applied to the protective panel using a pressing plate, a flexible pad is provided below the initial panel assembly, and the surface of the protective panel facing away from the display panel is used as a reference surface. The laminating step further comprises: Obtaining a distance H between the pressing plate and the reference surface; The pressing plate is controlled to move downward by a distance h, wherein 0.1 mm ≤ hH ≤ 1 mm.

[0010] According to some embodiments of the present invention, in the pressurized degassing step, the initial panel assembly is placed in a degassing chamber, and then gas is introduced into the degassing chamber and the pressure is maintained, while the initial panel assembly is heated.

[0011] According to some embodiments of the present invention, before the pressurized degassing step, the initial panel assembly is placed in a vacuum bag and sealed.

[0012] According to some embodiments of the present invention, the display panel and the protection panel are flexible panels.

[0013] According to some embodiments of the present invention, the display panel and the protection panel are hard panels.

[0014] According to some embodiments of the present invention, before the lamination step, the bonding adhesive is subjected to UV irradiation.

[0015] According to the second aspect of the present invention, the display screen is prepared by applying the display screen bonding process of the first aspect of the present invention. The display screen includes a display panel, a protective panel and a bonding adhesive located therebetween, and the bonding adhesive bonds the display panel and the protective panel.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a flow chart of an embodiment of the display screen bonding process of the present invention; Figure 2 Schematic diagram of the descending distance of the pressing plate in the pressing step; Figure 3 FIG. 1 is a schematic diagram of an embodiment of a display screen of the present invention.

[0018] Reference numerals: Initial panel assembly 10 , display panel 100 , protection panel 200 , bonding adhesive 300 , pressing plate 400 , flexible pad 500 . DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0024] In the traditional display screen manufacturing process, colloid is usually attached between two panels to achieve bonding between the two panels. After the colloid is attached to the panels, it is an inherent practice in the industry to expel the air between the panel and the colloid by vacuuming. It is generally believed that vacuuming can eliminate most defects caused by bubbles during bonding. This is especially true for thicker displays. Without vacuuming, it is difficult for the colloid and the panel to close. In addition, for large-size (such as larger than 6 inches), fully laminated, high-resolution panels, curved panels, and flexible panels, the industry generally believes that vacuuming can eliminate bubbles introduced during the initial bonding, avoiding defects such as panel delamination and Newton rings. However, the applicant found in actual production that this vacuuming method is only suitable for display screens of conventional thickness (ordinary LCDs, car displays, etc.). For ultra-thin flexible screens, thin rigid screens and other thin display screens (such as flexible OLED, UTG, POLED, etc.), excessively fast vacuuming speed will cause a large rate of pressure change in the cavity, which can easily lead to liquid crystal leakage and deformation of the panel due to stress. The leakage points will appear as yellow dots after the display screen is lit. The stress deformation of the panel will cause Newton rings and mura to appear on the display screen. If the vacuuming speed is slowed down, the bonding efficiency of the display screen will be affected, increasing the manufacturing cost of the display screen.

[0025] In view of the problem that the vacuum rate is not well controlled during the traditional display screen bonding process, which leads to poor bonding of the display screen and affects the efficiency of display screen preparation, Figure 1 In this embodiment, a display screen bonding process (hereinafter referred to as bonding process) is provided. The bonding process includes the following steps: First, a display panel 100 and a protective panel 200 are set. The display panel 100 is a panel with image display function. In addition, the display panel 100 can have its own touch module and touch function. The protective panel 200 is usually attached to the upper surface of the display panel 100 to protect the display panel 100. The protective panel 200 can be set as protective glass or a touch panel with touch function. The bonding adhesive 300 is attached to the opposite surfaces of the display panel 100 and the protective panel 200, that is, one side of the bonding adhesive 300 is attached to the surface of the display panel 100, and the other side of the bonding adhesive 300 is attached to the surface of the protective panel 200. After the display panel 100, the bonding adhesive 300, and the protective panel 200 are attached together to form the initial panel assembly 10. The bonding adhesive 300 in this embodiment is configured as a UV-curable optically transparent hot-melt adhesive film (TOCA). TOCA optical adhesive film has the characteristics of high ductility, high flexibility, high light transmittance, and low refractive index. It can meet the bonding requirements of flexible screens and folding screens, and has strong self-adhesion. When bonding with a thin panel, due to the following effect, the bubbles between the bonding adhesive 300 and the panel are squeezed out as the bonding adhesive 300 continues to bond to the panel, which can reduce the initial bubbles in the initial panel assembly 10.

[0026] After the initial panel assembly 10 is formed, a degassing device can be used to heat and degas the initial panel assembly 10. For example, the initial panel assembly 10 is placed in a degassing chamber, and then gas is introduced into the degassing chamber. The gas can be air or an inert gas, such as nitrogen, argon, etc., to reduce the impact of oxygen and water vapor in the degassing chamber on the initial panel assembly 10; as the gas is continuously introduced into the degassing chamber, the pressure in the degassing chamber increases, and the bubbles between the display panel 100 and the bonding adhesive 300 and between the protective panel 200 and the bonding adhesive 300 flow toward the edge of the initial panel assembly 10 under the action of pressure and are squeezed out to achieve bubble removal. After pressurized degassing, the initial panel assembly 10 forms an intermediate panel assembly. During the heating degassing process, the bonding adhesive 300 freely extends between the display panel 100 and the protective panel 200, so that the bonding adhesive 300 is flat between the display panel 100 and the protective panel 200. No stress is generated in the bonding adhesive 300 during the extension process, and the bubbles are squeezed out. The protective panel 200 and the display panel 100 in the intermediate panel assembly are parallel to each other, presenting a flat panel stacking state.

[0027] After pressure degassing is complete, the intermediate panel assembly is cured. This curing process causes the functional group molecules in the adhesive 300 to undergo a cross-linking reaction, converting the self-adhesive force of the adhesive 300 into adhesive force, thereby firmly bonding the display panel 100 and the protective panel 200 together to form a structurally stable display screen. The curing method of the intermediate panel assembly is not limited to irradiating the intermediate panel assembly with UV light or heating the intermediate panel assembly.

[0028] It can be understood that in this embodiment, the display panel 100 and the protective panel 200 are attached by TOCA optical adhesive film, and the vacuuming step is not set in the production process of the display screen. The bonding yield and the production efficiency of the display screen are not affected by the vacuuming rate. Since the vacuuming step is omitted, the production efficiency of the display screen is improved, and the panel will not be deformed due to vacuuming, and the risk of liquid crystal leakage is reduced, thereby improving the bonding yield of the display screen.

[0029] It should be noted that the curing of TOCA optical adhesive film is unaffected by the type of gas in the atmosphere. However, for anaerobic colloids (such as OCA), after lamination, the oxygen between the colloid and the panel must be expelled through vacuuming and applying high pressure to ensure adhesion. However, vacuuming and pressurizing inevitably cause stress and deformation in the panel, which can cause defects such as rainbow lines when the display is illuminated. Therefore, the lamination process in this embodiment can overcome lamination defects caused by inherent colloid defects, eliminating the need to consider the influence of gas type during the lamination process, and providing greater flexibility in the configuration of various steps in the lamination process.

[0030] TOCA optical adhesive film comprises an adhesive film layer and release layers attached to both sides of the film layer. During the initial panel assembly 10 molding process, the release layer on one side of the film layer must first be removed, and the exposed side of the film layer must be attached to either the display panel 100 or the protective panel 200. The release layer on the other side is then removed, and the exposed side of the film layer is attached to the other of the display panel 100 and the protective panel 200. The opposite sides of the film layer are attached to the facing surfaces of the display panel 100 and the protective panel 200, respectively. Before curing, the surface of the film layer only possesses self-adhesion. This self-adhesion allows the film layer to initially position itself against the panel, preventing displacement after attachment. It also allows the film layer to squeeze out air between the two panels during attachment, reducing initial bubbles within the initial panel assembly 10.

[0031] In one embodiment, before the pressurized degassing step, the initial panel assembly 10 is pressed to close the edges between the display panel 100 and the protective panel 200. "Closed edges between the display panel 100 and the protective panel 200" means that the edges of the display panel 100 and the laminating adhesive 300 are in contact with each other, and the edges of the protective panel 200 and the laminating adhesive 300 are in contact with each other. This prevents gas in the degassing chamber from entering the initial panel assembly 10 through the gap between the panel and the edge of the laminating adhesive 300 during the pressurized degassing process, thereby preventing bubbles from forming in the initial panel assembly 10.

[0032] It is understood that during the pressing step, the initial panel assembly 10 can be placed on an operating platform, and pressure is applied to the initial panel assembly 10 using a pressure plate 400. The initial panel assembly 10 is clamped between the operating platform and the pressure plate 400, and the edges of the display panel 100 and the protective panel 200 are pressed and closed. The pressure plate 400 can be configured as a frame, and the frame-shaped pressure plate 400 can be pressed against the edges of the protective panel 200 to achieve precise pressing of the initial panel assembly 10; alternatively, the pressure plate 400 can be configured as a flat plate, and the area of ​​the pressure plate 400 facing the initial panel assembly 10 is larger than the area of ​​the upper surface of the protective panel 200, ensuring that the edges of the initial panel assembly 10 are pressed by the combined pressure of the pressure plate 400 and the operating platform.

[0033] In some embodiments, during the lamination step, the initial panels are heated while pressure is applied to the initial panel assembly 10, and the adhesive 300 is suddenly heated to a molten state and flows between the display panel 100 and the protective panel 200, so that the adhesive 300 is spread flat between the display panel 100 and the protective panel 200. The adhesive 300 can squeeze out bubbles between the panels by flowing, so that the initial panel assembly 10 is flatter after being pressed.

[0034] It should be noted that, in the case where the display panel 100 and the protective panel 200 are flexible panels, the display panel 100 and the protective panel 200 themselves have a certain self-adhesion force, and the adhesive film layer of the bonding adhesive 300 is a flexible solid adhesive film. During the bonding process between the display panel 100 and the bonding adhesive 300 and the bonding process between the protective panel 200 and the bonding adhesive 300, the air between the two is squeezed out due to the mutual adhesion, and the display panel 100 and the protective panel 200 are automatically closed. The bonding efficiency of the bonding adhesive 300 and the panel during the bonding process is high and the bubble removal effect is good. After the display panel 100, the protective panel 200, and the bonding adhesive 300 form the initial panel assembly 10, pressurized degassing can be performed directly, or pressurized degassing can be performed after the edge closure is further achieved during the lamination process to improve the bonding efficiency of the flexible display screen and reduce the probability of stress deformation of the panel during the pressurization and heating process, which can adapt to the development trend of ultra-thin and ultra-soft liquid crystal glass.

[0035] In the case where the display panel 100 and the protective panel 200 are thin hard panels, the panels are less affected by heating and pressurization, and the parallelism of the display panel 100 and the protective panel 200 after being bonded is relatively high. After the display panel 100, the protective panel 200 and the bonding adhesive 300 are formed into the initial panel assembly 10, the bonding adhesive 300 is heated and pressurized by simultaneously heating and pressurizing the initial panel assembly 10, so that the bonding adhesive 300 is heated and pressurized and fully flows between the display panel 100 and the protective panel 200, thereby improving the bubble removal effect and bonding flatness of the initial panel assembly 10.

[0036] Since the bonding adhesive 300 becomes flowable after being melted by heat, if the laminating process of the bonding adhesive 300 is set to be carried out in a vacuum environment, and the external environment of the initial panel assembly 10 is in a negative pressure state, the bonding adhesive 300 will flow rapidly to the edge of the panel under the action of pressure, which can easily cause the bonding adhesive 300 to overflow; the bonding process in the present invention does not have a vacuuming process, even if the initial panel assembly 10 is heated and pressurized, since the internal and external pressures of the initial panel assembly 10 are balanced, it is not easy for the glue to overflow.

[0037] In addition, in order to address the risk of overflow of the bonding adhesive 300 during the heating and pressurizing process, in some embodiments, before the lamination step, the bonding adhesive 300 is subjected to UV irradiation, and the bonding adhesive 300 shrinks during the UV irradiation process. When the initial panel assembly 10 is heated and pressurized, the bonding adhesive 300 has shrunk in advance, which can reduce the probability of overflow of the bonding adhesive 300 and reduce the deformation of the bonding adhesive 300 when pressurized, so that the bonding of the bonding adhesive 300 between the display panel 100 and the protective panel 200 is smoother. It is understandable that the above-mentioned UV irradiation process can be set after the bonding adhesive 300 is attached to the display panel 100 or the protective panel 200, or before the bonding adhesive 300 is attached to the display panel 100 and the protective panel 200, or after the initial panel assembly 10 is formed; in one embodiment, the UV irradiation step is set after one side of the bonding adhesive 300 is attached to the display panel 100 or the protective panel 200, and the release layer on the other side has been torn off. On the one hand, it avoids the generation of adhesion force after UV irradiation of the bonding adhesive 300, which affects the removal of the release layer. On the other hand, it avoids the products generated by the release layer during UV irradiation from being transferred to the bonding adhesive 300, affecting the bonding performance of the bonding adhesive 300.

[0038] In some embodiments, reference Figure 2During the lamination process, the pressure plate 400 is used to apply pressure to the protective panel 200, and a flexible pad 500 is set under the initial panel assembly 10. The pressure plate 400 moves from top to bottom, thereby applying pressure to the initial panel assembly 10. The protective panel 200 of the initial panel assembly 10 is on the top and the display panel 100 is on the bottom, that is, the display panel 100 is closer to the flexible pad 500. Taking the surface of the protective panel 200 facing away from the display panel 100 as a reference, when pressure is applied to the initial panel assembly 10, first obtain the distance H between the pressure plate 400 and the reference plane, and then control the panel to move downward by a distance h, where 0.1mm≤hH≤1mm, that is, the descending distance of the pressure plate 400 is 0.1mm-1mm lower than the reference plane. When the pressure plate 400 has descended to the reference plane and continues to descend, the flexible pad 500 is deformed; on the one hand, the flexible contact between the display panel 100 and the flexible pad 500 can avoid damage to the liquid crystal in the display panel 100 during the lamination process, thereby ensuring the lamination quality. On the other hand, the deformation of the flexible pad 500 during the lamination process can ensure that the edges of the display panel 100 and the protective panel 200 are tightly closed, thereby improving the subsequent pressurized degassing quality.

[0039] It is understood that the flexible pad 500 can be made of materials such as sponge, silicone, and rubber. The lowering distance of the pressure plate 400 by 0.1mm-1mm below the reference surface can ensure that the display panel 100 and the protective panel 200 are tightly closed when the initial panel assembly 10 is under pressure, and can also prevent damage to the initial panel assembly 10 due to excessive downward pressure of the pressure plate 400. In addition, the pressure plate 400 can be configured as a hard, flat structure. When the pressure plate 400 presses on the initial panel assembly 10, it can provide a uniform and balanced pressing effect on different positions of the initial panel assembly 10, making the initial panel assembly 10 fit more smoothly.

[0040] During the pressurized degassing process, gas is continuously introduced into the degassing chamber to make the air pressure in the degassing chamber reach a preset value, and then a pressure maintaining treatment is performed to allow the initial panel assembly 10 to degas under a stable pressure environment; in addition, during the pressurized degassing process, the initial panel assembly 10 is heated at the same time, and the bonding adhesive 300 can further flow and spread out in the degassing chamber to improve the situation where the bonding adhesive 300 has not been leveled in the previous steps, thereby improving the degassing effect.

[0041] The above-mentioned pressure maintaining step can be achieved by intermittently introducing gas into the degassing chamber. For example, after the air pressure in the degassing chamber reaches a preset value, the ventilation to the degassing chamber is stopped, and the air pressure in the degassing chamber is detected in real time by a pressure sensor. When the air pressure in the degassing chamber is lower than the limit value, the degassing chamber is continued to be ventilated to stabilize the air pressure in the degassing chamber within a preset range. The temperature increase process in the pressurized degassing step is arranged after the initial panel assembly 10 is placed inside the degassing chamber, so that the bonding adhesive 300 gradually switches to a molten state after entering the degassing chamber, and flows under the action of gas pressure, thereby avoiding direct contact between the gas in the degassing chamber and the flowing bonding adhesive 300, and introducing bubbles into the initial panel assembly 10.

[0042] In addition, in order to prevent the gas in the degassing chamber from entering the initial panel assembly 10 during the pressurized degassing process, the initial panel assembly 10 is placed in a vacuum bag and sealed before the pressurized degassing step. On the one hand, due to the negative pressure in the vacuum bag, the gas pressure in the degassing chamber can directly act on the initial panel assembly 10, without affecting the pressurized degassing process of the bonding adhesive 300. The bubbles between the bonding adhesive 300 and the panel can be directly discharged into the vacuum bag. On the other hand, the vacuum bag blocks the entry of external gas, preventing the degassing chamber from introducing bubbles into the initial panel assembly 10.

[0043] The present invention also provides a display screen prepared by the above bonding process, referring to Figure 3 The display screen includes a display panel 100, a bonding adhesive 300 and a protective panel 200, and opposite sides of the bonding adhesive 300 are respectively bonded to the protective panel 200 and the display panel 100.

[0044] The protection panel 200 and the display panel 100 can both be set as ultra-thin flexible panels (≤50μm), such as flexible OLED, POLED, etc., or the protection panel 200 and the display panel 100 can be set as thin hard panels (≤200μm), such as UTG, etc.

[0045] Exemplarily, the protective panel 200 is set as a touch layer with touch function (not limited to On-Cell or In-Cell), and the display screen is set as a combination structure of LCD / OLED panel + bonding adhesive 300 + touch layer; or, the display panel 100 is set as a functional panel with touch function, and the display screen is set as a combination structure of functional panel + bonding adhesive 300 + cover glass; or, the display panel 100 is set as a flexible OLED panel, the protective panel 200 is set as a polarizer or ultra-thin glass, and the display screen is set as a combination structure of flexible OLED panel + bonding adhesive 300 + polarizer / ultra-thin glass.

[0046] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. Display screen lamination process, characterized in that: include: Arrange a display panel and a protective panel, and adhere bonding adhesive to the opposite surfaces of the two to form an initial panel assembly, wherein the bonding adhesive is a UV curable optical adhesive film; Pressurizing and degassing the initial panel assembly to form an intermediate panel assembly; After the pressure degassing is completed, the middle panel assembly is cured.

2. The display screen bonding process according to claim 1, characterized in that: Before the pressurized degassing step, the initial panel assembly is pressed to close the edges between the display panel and the protection panel.

3. The display screen bonding process according to claim 2, characterized in that: In the lamination step, pressure and heat are simultaneously applied to the initial panel assembly, and the laminating adhesive is converted into a molten state and flows between the display panel and the protective panel.

4. The display screen bonding process according to claim 2, characterized in that: In the laminating step, a pressure plate is used to apply pressure to the protective panel, a flexible pad is provided below the initial panel assembly, and a surface of the protective panel facing away from the display panel is used as a reference surface. The laminating step further comprises: Obtaining a distance H between the pressing plate and the reference surface; The pressing plate is controlled to move downward by a distance h, wherein 0.1 mm ≤ hH ≤ 1 mm.

5. The display screen bonding process according to claim 1, characterized in that: In the pressurized degassing step, the initial panel assembly is placed in a degassing chamber, and then gas is introduced into the degassing chamber and the pressure is maintained, while the initial panel assembly is heated.

6. The display screen bonding process according to claim 1, characterized in that: Before the pressure degassing step, the initial panel assembly is placed in a vacuum bag and sealed.

7. The display screen bonding process according to claim 2, characterized in that: The display panel and the protection panel are flexible panels.

8. The display screen bonding process according to claim 3, characterized in that: The display panel and the protection panel are hard panels.

9. The display screen bonding process according to claim 3, characterized in that: Before the lamination step, the laminating adhesive is subjected to UV irradiation.

10. A display screen, characterized in that The display screen is prepared by the display screen bonding process according to any one of claims 1 to 9, wherein the display screen comprises a display panel, a protective panel and a bonding adhesive located therebetween, wherein the bonding adhesive bonds the display panel and the protective panel.

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