LCD manufacturing process

Abstract

The present invention discloses a manufacturing process for a liquid crystal display screen, and relates to the technical field of liquid crystal display screen manufacturing. The liquid crystal display screen includes an LCM flexible module and a cover plate. The manufacturing process of the liquid crystal display screen includes a packaging process, and the packaging process includes the following steps: using an OCA bonding process, first bonding the OCA optical glue to the cover plate, and then bonding the cover plate to the LCM flexible module; and packaging the bonded cover plate and the LCM flexible module using a sealing process of UV glue + ALD film + UV glue + ALD film + UV glue. This packaging process avoids the uneven coating of glue and film in the subsequent process due to the large deformation of the LCM flexible module, which affects the packaging quality. Moreover, the ALD coating forms a very good water and oxygen barrier layer. The five-layer structure packaging is used during packaging, which can avoid cracks in the packaging layer, improve the stability of the packaging layer, and at the same time improve the ability to block water and oxygen.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal screen manufacturing, and in particular to a manufacturing process of a liquid crystal display screen. Background Art

[0002] Flexible displays are currently widely used in mobile phones. Depending on the location of the display components, they can be categorized as notch screens, waterdrop screens, hole-punch screens, and waterfall screens. During the manufacturing process, these displays typically require the display module to be encapsulated with a cover plate to protect it from direct impact, collision, and moisture.

[0003] In existing technologies, the encapsulation layer of a display module is formed by stacking inorganic and organic layers to form a coating film, which acts as a barrier to water and oxygen and provides a flat surface. However, this encapsulation layer is prone to cracking. Furthermore, when encapsulating a display module with an encapsulation cover, the display module is typically edge-sealed before being bonded to the cover. However, the significant deformation of flexible display modules can result in uneven adhesive application, impacting encapsulation quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a manufacturing process for a liquid crystal display screen to achieve uniformity and stability of the encapsulation layer when encapsulating a flexible display module, avoid cracks, and improve the ability to block water and oxygen.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A manufacturing process for a liquid crystal display screen, wherein the liquid crystal display screen includes an LCM flexible module and a cover plate, and the manufacturing process for the liquid crystal display screen includes a packaging process, and the packaging process includes the following steps:

[0007] Adopting the OCA bonding process, first bonding the OCA optical adhesive to the cover plate, and then bonding the cover plate to the LCM flexible module;

[0008] The bonded cover plate and the LCM flexible module are packaged using a sealing process of UV glue + ALD film + UV glue + ALD film + UV glue.

[0009] As an optional solution for the manufacturing process of the liquid crystal display, the manufacturing process of the liquid crystal display also includes a cutting process, which is performed before the packaging process; according to the different distribution positions of the facial display, the LCM flexible module includes a water drop screen module and a notch screen module, and the water drop screen module is cut into the notch screen module through the cutting process.

[0010] As an optional solution for the manufacturing process of the liquid crystal display screen, the cutting process includes the following steps:

[0011] According to the drawing of the notch screen module, the water drop screen module is cut by a picosecond laser cutting machine to form the notch screen module;

[0012] After the cutting is completed, the edge of the notch screen module is polished.

[0013] As an optional solution for the manufacturing process of the liquid crystal display, when the water drop screen module is cut to form the notch screen module, the outer edge of the notch screen module and the bangs area of ​​the notch screen module are cut multiple times with a cutting energy of 5W to 10W.

[0014] As an optional solution for the manufacturing process of the liquid crystal display, when polishing the edge of the notch screen module, the bright and dark line areas of the edge of the notch screen module are polished when the notch screen module is lit.

[0015] As an optional solution for the manufacturing process of the liquid crystal display, the bright and dark line areas at the edge of the notch screen module are polished and ground using nano-sponge.

[0016] As an optional solution for the manufacturing process of the liquid crystal display, when the OCA optical adhesive is used to bond the cover plate and the LCM flexible module, the outer edge of the OCA optical adhesive is spaced a set distance from the outermost edge of the bonded cover plate and the LCM flexible module.

[0017] As an optional solution for the manufacturing process of the liquid crystal display screen, the set distance is 0.1 mm to 0.2 mm.

[0018] As an optional solution for the manufacturing process of the liquid crystal display, when the laminated cover plate and the LCM flexible module are sealed with UV glue, curing is performed by a UV-moisture dual-curing method.

[0019] As an optional solution for the manufacturing process of the liquid crystal display, when the laminated cover plate and the LCM flexible module are sealed with an ALD film, the coating thickness of the ALD film is 30 nm to 40 nm.

[0020] Beneficial effects of the present invention:

[0021] The manufacturing process of the liquid crystal display provided by the present invention adopts an OCA bonding process when packaging the LCM flexible module and the cover plate in the packaging process, first bonding the OCA optical glue to the cover plate, and then bonding the cover plate to the LCM flexible module. Then, the bonded cover plate and LCM flexible module are packaged using a sealing process of UV glue + ALD film + UV glue + ALD film + UV glue. The cover plate and the LCM flexible module are first bonded, and then the bonded cover plate and LCM flexible module are packaged, thereby avoiding uneven glue coating and film coating caused by the deformation of the LCM flexible module in the subsequent process due to the large deformation of the LCM flexible module, which affects the packaging quality. In addition, the ALD coating forms a very good water and oxygen barrier layer, but because the coating material of the ALD film is an inorganic substance, the inorganic film layer has internal stress, which will form cracks and defects during film formation, and therefore needs to be covered with UV glue. During packaging, UV adhesive is first applied to ensure that the first layer of packaging closest to the LCM flexible module and cover plate will not crack. The second layer of packaging is made of ALD film, forming the first water and oxygen barrier. Because ALD film is prone to cracking, the third layer of packaging is covered with UV adhesive, and the fourth layer of packaging is made of ALD film again, forming the second water and oxygen barrier. Finally, a layer of UV adhesive is applied to ensure that the outermost packaging layer will not crack. The five-layer packaging structure can not only prevent the packaging layer from cracking and improve the stability of the film layer, but also enhance the ability to block water and oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of a manufacturing process of a liquid crystal display provided by an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of cutting a water drop screen module into a notch screen module according to an embodiment of the present invention;

[0024] Figure 3 It is a structural diagram of packaging a notch screen module provided by an embodiment of the present invention.

[0025] In the picture:

[0026] 1. LCM flexible module; 2. Cover plate; 3. UV adhesive; 4. ALD film;

[0027] 101. Waterdrop screen module; 102. Notch screen module; 11. Support film; 12. Guide film; 13. Thin film transistor; 14. Light-emitting layer; 15. Polarizer. DETAILED DESCRIPTION

[0028] 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 to explain the present invention, but are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0030] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0031] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0033] like Figure 1-Figure 3 As shown, the manufacturing process of the liquid crystal display provided in this embodiment, the liquid crystal display includes an LCM flexible module 1 and a cover plate 2, the LCM flexible module 1 includes a support film 11, a guide film 12, a thin film transistor 13, a light-emitting layer 14 and a polarizer 15 stacked in sequence from bottom to top, and the cover plate 2 is arranged above the polarizer 15 to protect the LCM flexible module 1.

[0034] The manufacturing process of liquid crystal display includes a packaging process, which includes the following steps:

[0035] S201 , using the OCA bonding process, first bonding the OCA optical adhesive to the cover plate 2 , and then bonding the cover plate 2 to the LCM flexible module 1 .

[0036] OCA (Optically Clear Adhesive) optical adhesive is made of optical acrylic adhesive without a base material, and then a layer of release film is attached to the upper and lower layers. It is a high-transparency double-sided laminating tape without a base material. It has average cohesion and very high fluidity, and is very easy to deform after extrusion.

[0037] When bonding the OCA optical adhesive to the cover plate 2, first peel off the light film on the OCA optical adhesive, and bond the cover plate 2 to the upper surface of the OCA optical adhesive. Then peel off the heavy film under the OCA optical adhesive, and bond the LCM flexible module 1 to the lower surface of the OCA optical adhesive, thereby achieving bonding between the cover plate 2 and the LCM flexible module 1.

[0038] Furthermore, when using OCA optical adhesive to bond the cover plate 2 and the LCM flexible module 1, a set distance is set between the outer edge of the OCA optical adhesive and the outermost edge of the bonded cover plate 2 and the LCM flexible module 1. This allows the adhesive to penetrate between the cover plate 2 and the LCM flexible module 1 during subsequent manufacturing processes, ensuring that there is no gap between the cover plate 2 and the LCM flexible module 1. Specifically, the set distance is 0.1 mm to 0.2 mm.

[0039] S202 , encapsulating the bonded cover plate 2 and the LCM flexible module 1 by using a sealing process of UV glue 3 + ALD film 4 + UV glue 3 + ALD film 4 + UV glue 3 .

[0040] Furthermore, when the laminated cover plate 2 and the LCM flexible module 1 are sealed with the UV glue 3 , the UV-light-moisture dual-curing method is used for curing.

[0041] UV glue 3 is epoxy resin, single component. The density of UV glue 3 used is 1.05g / cm 3 The viscosity is 15000pcs~20000pcs, the surface drying time is 10s~20s; the cumulative curing energy is 4000mj~5000mj, and the water resistance within 24 hours is 0.2g / m 3 , dielectric strength is 30KV / mm, surface resistivity is 1.7×10 15 Ω.

[0042] Curing is accomplished through a dual UV-moisture curing process. Under UV radiation, the adhesive rapidly solidifies to form a silicone system with a defined thickness and bond strength. Moisture curing then proceeds to enhance bond strength and mechanical properties. Moisture curing can complete the curing process in areas where UV radiation is inadequate, achieving the desired effect. The cured adhesive exhibits excellent bonding properties, high and low temperature resistance, and electrical insulation, meeting the rapid bonding and packaging requirements for LCD displays.

[0043] Furthermore, when the ALD film 4 is used to seal the bonded cover plate 2 and the LCM flexible module 1 , the coating thickness of the ALD film 4 is 30 nm to 40 nm.

[0044] The coating material of ALD film 4 (Atomic layer deposition) is aluminum oxide, which is an inorganic substance. The water resistance can reach 10-5g / m2 in 24 hours. 3 The ALD film 4 has a low energy density and a small impact on the LCM flexible module 1, which will not cause damage to the LCM flexible module 1.

[0045] The manufacturing process of the liquid crystal display provided in this embodiment adopts an OCA bonding process when packaging the LCM flexible module 1 and the cover plate 2 during the packaging process. The OCA optical glue is first bonded to the cover plate 2, and then the cover plate 2 is bonded to the LCM flexible module 1. The bonded cover plate 2 and LCM flexible module 1 are then packaged using a sealing process of UV glue 3 + ALD film 4 + UV glue 3 + ALD film 4 + UV glue 3. The cover plate 2 and the LCM flexible module 1 are first bonded, and then the bonded cover plate 2 and LCM flexible module 1 are packaged. This avoids uneven glue coating and film coating caused by the deformation of the LCM flexible module 1 in subsequent processes due to the large deformation of the LCM flexible module 1, which affects the packaging quality. The ALD film 4 forms a strong barrier to moisture and oxygen. However, because the ALD film 4 is made of an inorganic material, it has internal stresses that can cause cracks and defects during film formation. Therefore, it needs to be covered with UV glue 3. During packaging, the first packaging layer, closest to the LCM flexible module 1 and cover plate 2, is encapsulated with UV glue 3 to ensure that it will not crack. The second packaging layer uses ALD film 4 to form the first barrier to moisture and oxygen. Because ALD film 4 is prone to cracking, the third packaging layer is covered with UV glue 3. The fourth packaging layer uses ALD film 4 again to form the second barrier to moisture and oxygen. Finally, a layer of UV glue 3 is applied to ensure that the outermost packaging layer is free of cracks. The five-layer packaging structure prevents cracks in the packaging layer, improves the stability of the film layer, and enhances the ability to block moisture and oxygen.

[0046] Currently, LCM flexible modules1 can be categorized by the placement of facial components: notch screens, waterdrop screens, hole-punch screens, and waterfall screens. During the manufacturing process, different displays typically cannot share the same array and yellow light mask, resulting in extremely high mold costs for each product.

[0047] In order to reduce the cost of product mold opening, the manufacturing process of the liquid crystal display provided in this embodiment also includes a cutting process. The cutting process is performed before the above-mentioned packaging process. According to the different distribution positions of the facial display, the LCM flexible module 1 includes a water drop screen module 101 and a notch screen module 102. The water drop screen module 101 is cut to form a notch screen module 102 through the cutting process.

[0048] Since the non-display area of ​​the notch screen is larger than that of the water drop screen, in order to save mold opening costs, the water drop screen and the notch screen share the same screen body. The water drop screen is cut according to the notch screen drawing and then edge-sealed and cured to achieve the display effect of the notch screen.

[0049] Specifically, the cutting process includes the following steps:

[0050] S101 . According to the drawing of the notch screen module 102 , the water drop screen module 101 is cut by a picosecond laser cutting machine to form the notch screen module 102 .

[0051] Compared with carbon dioxide laser cutting, cutting with a picosecond laser cutting machine can reduce the heat radiation of laser cutting and reduce the impact of cutting on the display area.

[0052] Furthermore, to reduce the impact of thermal radiation on organic materials, when cutting the waterdrop screen module 101 to form the notch screen module 102, multiple cuts are performed at a cutting energy of 5W to 10W on the outer edge of the notch screen module 102 and the notch area of ​​the notch screen module 102. By performing multiple cuts at lower energy, the impact of cutting thermal radiation on the organic materials is reduced, thereby reducing the carbonized area. During the multiple cuts, the cuts are performed in layers, from the cover plate 2 to the notch screen module 102, from top to bottom.

[0053] For example, the cutting power of the picosecond laser cutting machine is 300W, the cutting energy is 5W, the number of cutting times of the outer edge is 70 to 90 times, the number of cutting times of the bangs area is 15 to 25 times, and the laser load is 30%.

[0054] Of course, in actual operation, the operator can adjust the number of cutting times and the cutting energy according to the specific size of the water drop screen module 101 and the specific size of the notch screen module 102 to be cut.

[0055] S102: After the cutting is completed, the edge of the notch screen module 102 is polished.

[0056] Since there will be a sintered area on the edge after laser cutting, the thin film transistor 13 will have a local short circuit phenomenon, and the local short circuit position needs to be polished off.

[0057] Specifically, when polishing the edge of the notch screen module 102, the bright and dark line areas of the edge of the notch screen module 102 are polished while the notch screen module 102 is illuminated. Further, the bright and dark line areas of the edge of the notch screen module 102 are polished using nanosponge.

[0058] During polishing, the cut notch screen module 102 is first placed in a polishing jig. Then, the notch screen module 102 is illuminated using a lighting jig. After lighting, only the bright and dark line areas are polished. Other areas without abnormalities are not polished. During polishing, nano sponge is used for polishing. Nano sponge is a small, fine, and soft material that can avoid damaging the LCM flexible module 1 during polishing.

[0059] After the notch screen module 102 is polished, the above-mentioned packaging process is used to package the notch screen module 102 and the cover plate 2 to ensure the sealing and display effect of the notch screen module 102 cut from the water drop screen module 101, thereby realizing the water drop screen module 101 and the notch screen module 102 sharing a screen body, saving mold opening costs, and the packaging quality is high, thereby improving the quality of the LCD display converted from the water drop screen module 101 to the notch screen module 102.

[0060] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A manufacturing process for a liquid crystal display screen, wherein the liquid crystal display screen comprises an LCM flexible module (1) and a cover plate (2), characterized in that: The manufacturing process of the liquid crystal display includes a packaging process, and the packaging process includes the following steps: An OCA bonding process is adopted, wherein the OCA optical adhesive is first bonded to the cover plate (2), and then the cover plate (2) is bonded to the LCM flexible module (1); when the OCA optical adhesive is used to bond the cover plate (2) and the LCM flexible module (1), an outer edge of the OCA optical adhesive is spaced a set distance from the outermost edge of the bonded cover plate (2) and the LCM flexible module (1); The bonded cover plate (2) and the LCM flexible module (1) are packaged using a sealing process of UV glue (3) + ALD film (4) + UV glue (3) + ALD film (4) + UV glue (3).

2. The manufacturing process of a liquid crystal display according to claim 1, characterized in that: The manufacturing process of the liquid crystal display further comprises a cutting process, which is performed before the packaging process; according to different facial display distribution positions, the LCM flexible module (1) comprises a water drop screen module (101) and a notch screen module (102), and the water drop screen module (101) is cut into the notch screen module (102) through the cutting process.

3. The manufacturing process of a liquid crystal display according to claim 2, characterized in that: The cutting process comprises the following steps: According to the drawing of the notch screen module (102), the water drop screen module (101) is cut by a picosecond laser cutting machine to form the notch screen module (102); After the cutting is completed, the edge of the notch screen module (102) is polished and ground.

4. The manufacturing process of a liquid crystal display according to claim 3, characterized in that: When the water drop screen module (101) is cut to form the notch screen module (102), the outer edge of the notch screen module (102) and the notch area of ​​the notch screen module (102) are cut multiple times with a cutting energy of 5W to 10W.

5. The manufacturing process of a liquid crystal display according to claim 3, characterized in that: When polishing and grinding the edge of the notch screen module (102), the bright and dark line areas of the edge of the notch screen module (102) are polished and ground while the notch screen module (102) is in a lighted state.

6. The manufacturing process of a liquid crystal display according to claim 5, characterized in that: The bright and dark line areas at the edge of the notch screen module (102) are polished and ground using nano sponges.

7. The manufacturing process of a liquid crystal display according to claim 1, characterized in that: The set distance is 0.1 mm to 0.2 mm.

8. The manufacturing process of a liquid crystal display according to claim 1, characterized in that: When the laminated cover plate (2) and the LCM flexible module (1) are sealed with UV glue (3), curing is performed by a UV-moisture dual curing method.

9. The manufacturing process of a liquid crystal display according to claim 1, characterized in that: When the laminated cover plate (2) and the LCM flexible module (1) are sealed using an ALD film (4), the coating thickness of the ALD film (4) is 30 nm to 40 nm.

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