A method for thinning a liquid crystal screen with COF and PCB

Abstract

The invention relates to the technical field of liquid crystal panel processing, and discloses a method for thinning a liquid crystal screen with a COF and a PCB. The method is applicable to a liquid crystal panel that has been cut and bonded with the COF and the PCB, and comprises the following steps: S1: selecting an acid-alkali resistant tape, a release film with a thickness of 70 to 120 microns, and a flexible sealant suitable for a chemical thinning environment as protective materials; by selecting protective materials such as the acid-alkali resistant tape, the release film, and the flexible sealant, the problem that the liquid crystal screen bonded with the COF and the PCB is easily corroded by a chemical etching solution during the thinning process in the prior art is effectively solved. The method adopts a combination of CF surface and TFT surface sealing tapes, and injects a flexible sealant at the junction of the tapes through a dispensing technology to form a fully enclosed protective structure, which not only realizes comprehensive protection of the COF, the PCB, and the terminal area, but also avoids the leakage problem during the chemical thinning process. The process can thin the liquid crystal screen to between 0.1 mm and 0.8 mm.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal panel processing, and in particular to a method for thinning a liquid crystal screen with a COF and a PCB. Background Art

[0002] Today, with the diversification of display production, in order to meet the needs of different industries and applications, some displays require special customization, such as cutting the screen to change the size of the screen, or bending the screen with a larger curvature to make a display module with a larger curvature. When customizing LCD screens with high bending requirements and small bending radius, since the original display panel thickness of 0.8-1.0 can no longer be bent further, the screen needs to be further thinned at this time. A thinner display screen can achieve a smaller radius of bending.

[0003] In actual applications, since customized screens are usually small-batch and diversified, they cannot be directly customized and developed by upstream panel manufacturers. Usually, existing display modules on the market are used for further processing. However, these screens are usually cut into individual display screens, with terminal lines exposed, and most of the screens have COF and PCB pasted before sales. Therefore, it is difficult to directly perform chemical thinning on such screens. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for thinning a liquid crystal screen with COF and PCB, which solves the problem that customized screens are difficult to directly undergo chemical thinning due to their small batch characteristics and the COF and PCB are already attached.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for thinning a liquid crystal screen with COF and PCB, which is applicable to a liquid crystal panel that has been cut and bonded with COF and PCB, comprises the following steps:

[0006] S1: Select acid and alkali resistant tape suitable for chemical thinning environment, release film with a thickness of 70 to 120 microns and flexible sealant as protective materials;

[0007] S2: Seal and protect the COF, PCB and terminal parts of the LCD panel, including:

[0008] S2.1: Lay the CF surface release film and the CF surface sealing tape in sequence on the area of ​​the CF surface of the liquid crystal panel that needs to be protected;

[0009] S2.2: Lay the CF surface release film and the CF surface sealing tape on the area of ​​the CF surface of the liquid crystal panel that needs to be protected in sequence;

[0010] S2.3: At the junction of the CF surface sealing tape and the TFT surface sealing tape, inject the sealing structural glue through the dispensing needle to fill the gap and form a completely closed protective structure;

[0011] S3: chemically thinning the sealed and protected liquid crystal panel to adjust the glass thickness to between 0.1 mm and 0.8 mm, and determine the specific thinning thickness according to application requirements;

[0012] S4: After the thinning is completed, the CF surface release film, the CF surface sealing tape, the TFT surface release film, the TFT surface sealing tape and the gap filling glue at both ends are removed in sequence to expose the thinned liquid crystal glass panel;

[0013] S5: Clean and inspect the thinned LCD panel to ensure that there is no residue on the panel and that the performance meets the requirements.

[0014] Preferably, the sealing protection structure adopts acid-alkali resistant tape, and the thickness thereof ranges from 70 to 120 microns, and the specific thickness can be adjusted according to the size of the liquid crystal panel and the complexity of the terminal area.

[0015] Preferably, the release film and the sealing tape are surface treated before use to improve their adhesion to the liquid crystal panel and ensure that they will not fall off or leak during the thinning process.

[0016] Preferably, a flexible sealant is used to seal the junction between the CF surface sealing tape and the TFT surface sealing tape. The sealant is injected through a dispensing needle to ensure that the gap is completely filled and prevent the infiltration of chemical etching liquid.

[0017] Preferably, acid and alkaline etching solutions are used in the chemical thinning process, and the sealing protection structure has excellent corrosion resistance to acidic and alkaline chemicals.

[0018] Preferably, the thinned liquid crystal panel forms a step structure, the step area retains the original glass thickness, and the thickness of the thinned area is adjusted to between 0.15 mm and 0.6 mm, which is customized according to specific application requirements.

[0019] Preferably, after the thinning is completed, the protective material is removed by an automatic process, and no residue is left on the surface of the liquid crystal panel after removal, thereby ensuring that the optical and physical properties of the thinned panel are not affected.

[0020] Preferably, through the automated dispensing control technology of the sealing structure, it can adapt to LCD panels of different sizes and shapes to meet small batch and diversified processing needs.

[0021] Preferably, after chemical thinning, the uniformity of the thickness of the liquid crystal panel surface is controlled within ±0.02 mm, meeting the use requirements of high-precision display devices.

[0022] Preferably, the thinned LCD panel is suitable for special application scenarios, including the design of high-bend modules and ultra-thin display modules. The bending radius of the thinned LCD panel can be less than 3 mm while maintaining the integrity and mechanical strength of the display performance.

[0023] Beneficial Effects

[0024] The present invention provides a method for thinning a liquid crystal screen with COF and PCB. Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a method for thinning a liquid crystal screen with COF and PCB. By selecting protective materials such as acid-alkali resistant tape, release film and flexible sealant, the problem that the liquid crystal screen with COF and PCB attached in the prior art is easily corroded by chemical etching solution during the thinning process is effectively solved. The method adopts a combination of CF surface and TFT surface sealing tapes, and injects flexible sealant at the junction of the tapes through dispensing technology to form a fully enclosed protection structure, which not only realizes comprehensive protection of COF, PCB and terminal areas, but also avoids leakage problems during chemical thinning. The process can thin the liquid crystal screen to between 0.1mm and 0.8mm, and retain the original thickness in the step area to enhance the mechanical strength of the panel, while meeting special needs in different scenarios, such as high-bend modules and ultra-thin Display module, the thinned liquid crystal panel can achieve a high-flexibility design with a bending radius of less than 3mm, while maintaining the integrity of display performance and physical strength. The sealing protection structure of the present invention can be completely removed after processing is completed, and will not cause any impact on the optical performance of the panel, thereby ensuring the consistency of product quality. In addition, through high-precision sealing technology, the method achieves strict control of the thickness uniformity of the liquid crystal panel within ±0.02mm, which is suitable for the use requirements of high-precision display devices and meets the processing requirements in the fields of flexible display and ultra-thin modules. Finally, the present invention supports small-batch and diversified production by flexibly adapting to liquid crystal screens of different sizes and shapes, and meets the market demand for high customization of display devices in the future while improving production efficiency. It has significant industrial application value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the overall process of a method for thinning a liquid crystal screen with COF and PCB proposed by the present invention;

[0027] Figure 2 A processing flow chart of a method for thinning a liquid crystal screen with COF and PCB proposed by the present invention;

[0028] Figure 3 A structural schematic diagram of one side of a method for thinning a liquid crystal screen with COF and PCB proposed by the present invention;

[0029] Figure 4 A partial structural schematic diagram of a method for thinning a liquid crystal screen with COF and PCB proposed by the present invention;

[0030] Figure 5 The present invention is a schematic structural diagram of a method for thinning a liquid crystal screen with COF and PCB. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 5 The present invention provides a technical solution, which specifically includes the following embodiments:

[0033] Example:

[0034] A method for thinning a liquid crystal screen with a COF and a PCB is applicable to a liquid crystal panel that has been cut and bonded with a COF and a PCB, and comprises the following steps:

[0035] S1: Select acid and alkali resistant tape suitable for chemical thinning environment, release film with a thickness of 70 to 120 microns and flexible sealant as protective materials;

[0036] S2: Seal and protect the COF, PCB and terminal parts of the LCD panel, including:

[0037] S2.1: Lay the CF surface release film and the CF surface sealing tape in sequence on the area of ​​the CF surface of the liquid crystal panel that needs to be protected;

[0038] S2.2: Lay the CF surface release film and the CF surface sealing tape on the area of ​​the CF surface of the liquid crystal panel that needs to be protected in sequence;

[0039] S2.3: Inject sealing structural glue through a dispensing needle at the junction of the CF surface sealing tape and the TFT surface sealing tape to fill the gap and form a completely enclosed protective structure;

[0040] S3: chemically thinning the sealed and protected liquid crystal panel to adjust the glass thickness to between 0.1 mm and 0.8 mm, and determining the specific thinning thickness according to application requirements;

[0041] S4: After the thinning is completed, the CF surface release film, the CF surface sealing tape, the TFT surface release film, the TFT surface sealing tape and the gap filling glue at both ends are removed in sequence to expose the thinned liquid crystal glass panel;

[0042] S5: Clean and inspect the thinned LCD panel to ensure that there is no residue on the panel and that the performance meets the requirements.

[0043] Preferably, the sealing protection structure uses an acid- and alkali-resistant tape with a thickness ranging from 70 to 120 microns. The specific thickness can be adjusted according to the size of the liquid crystal panel and the complexity of the terminal area.

[0044] In the above, the thickness of the acid-alkali resistant tape can be accurately selected according to the size of the specific panel and the complexity of the terminal distribution. For LCD panels with larger sizes or more terminal areas, thicker tapes can be used to reduce restrictions on process flexibility. At the same time, the material of the tape must have excellent corrosion resistance and high temperature resistance to ensure that it remains stable during the chemical thinning process without deformation or damage.

[0045] Preferably, the release film and the sealing tape are surface treated before use to improve their adhesion to the liquid crystal panel and ensure that they will not fall off or leak during the thinning process.

[0046] In the above, the surfaces of the release film and the sealing tape are subjected to special chemical or physical treatment (such as plasma cleaning, adhesive coating, etc.), which can significantly enhance their adhesion to the surface of the liquid crystal panel. The treated surface of the release film can effectively prevent warping under high temperature or chemical environment, while the sealing tape can provide better initial adhesion and durability, thereby avoiding the risk of leakage due to erosion by chemical etching solution during the thinning process.

[0047] Preferably, a flexible sealant is used to seal the joint between the CF surface sealing tape and the TFT surface sealing tape, and the sealant is injected through a dispensing needle to ensure that the gap is completely filled to prevent the infiltration of chemical etching solution.

[0048] In the above, the use of flexible sealant is to solve the gap problem caused by height difference or irregular edges at the junction of the CF surface and the TFT surface tape. The flexible sealant uses a highly fluid and fast-curing material, which is accurately injected into the junction area through a dispensing needle to ensure that the colloid can completely fill the gap and form an airtight protection. After curing, the sealant forms a highly elastic and chemically resistant sealing layer, which can effectively prevent the penetration of chemical etching liquid. At the same time, it will not cause residue or pollution to the surface of the LCD panel during the subsequent removal process.

[0049] Preferably, acid and alkaline etching solutions are used in the chemical thinning process, and the sealing protection structure has excellent corrosion resistance to acidic and alkaline chemicals.

[0050] In the above, the acid and alkali etching solution usually selects hydrofluoric acid or alkaline solution of appropriate concentration according to the requirements of the thinning process, and the sealing protection structure used must have the ability to withstand the erosion of these chemical liquids for a long time. Special anti-chemical corrosion additives are added to the material composition of the acid and alkali resistant tape and flexible sealant, which can maintain the sealing performance and mechanical integrity in a high concentration chemical environment, thereby ensuring that the COF and PCB parts in the sealing area will not be damaged.

[0051] Preferably, the thinned liquid crystal panel forms a step structure, the step area retains the original glass thickness, and the thickness of the thinned area is adjusted to between 0.15 mm and 0.6 mm, which is customized according to specific application requirements.

[0052] In the above, the design of the step structure can provide key mechanical support for the LCD panel, especially the enhancement of the ability to withstand external forces. The step part retains the original glass thickness, which can avoid the structural fragility caused by excessive thinning. At the same time, the thinning area is customized according to application requirements (such as thinning to 0.15mm when flexible display is required). This design not only achieves thinness, but also takes into account the strength and adaptability of the panel.

[0053] Preferably, after the thinning is completed, the protective material is removed by an automatic process, and no residue is left on the surface of the liquid crystal panel after removal, thereby ensuring that the optical and physical properties of the thinned panel are not affected.

[0054] In the above, the protective materials used (including release film, sealing tape and flexible sealant) are specially formulated and can be completely removed by manual peeling or solvent cleaning after the protective effect is completed. During the removal process, the protective materials will not cause any damage or contamination to the surface of the panel, and will not leave any residual substances in the optical functional area, thereby ensuring the integrity of the thinned panel in terms of optical performance, display effect and contact reliability.

[0055] Preferably, through the automated dispensing control technology of the sealing structure, it can adapt to LCD panels of different sizes and shapes to meet small batch and diversified processing needs.

[0056] In the above, the automated dispensing technology achieves flexible adaptation to LCD panels of different sizes and shapes through a precise control system. It is especially suitable for processing scenarios with small batches and high customization requirements. The dispensing process can be adjusted in real time according to the specific shape and size of the LCD screen to ensure that the sealant can be evenly distributed in the area that needs to be protected, while avoiding waste caused by excessive colloid or affecting processing efficiency.

[0057] Preferably, after chemical thinning, the uniformity of the thickness of the liquid crystal panel surface is controlled within ±0.02 mm, meeting the use requirements of high-precision display devices.

[0058] In the above, by strictly controlling the chemical thinning time, etching solution concentration and process parameters, the thickness of the thinned LCD panel is evenly distributed in the entire display area. Such high-precision processing can meet the strict requirements of high-resolution display devices (such as OLED, MicroLED, etc.) and avoid display distortion or uneven brightness caused by uneven thickness.

[0059] Preferably, the thinned LCD panel is suitable for special application scenarios, including the design of high-bend modules and ultra-thin display modules. The bending radius of the thinned LCD panel can be less than 3 mm while maintaining the integrity and mechanical strength of the display performance.

[0060] Among the above, the thinned LCD panel is particularly outstanding in the application of highly flexible and ultra-thin display devices, and its bending radius can be less than 3mm, meeting the demand for highly curved and thin display modules. In addition, thanks to the structural design and material optimization of the step area, the thinned LCD screen can still maintain the integrity of the display performance, and at the same time has good resistance to mechanical damage when bent or subjected to other external forces, providing technical support for the development of future flexible and wearable devices.

[0061] In order to more comprehensively verify the actual effects and technical advantages of the present invention, a series of experiments were designed and the experimental results were recorded. Through these experiments, we can clearly understand the specific performance and improvement effects of the present invention in different application scenarios. The following experiments cover the performance test of sealing materials, the accuracy verification of chemical thinning, the optical and mechanical performance evaluation of the thinned panel, and the adaptability analysis of the automated process in small batch production. These experiments can not only intuitively demonstrate the reliability and practicality of the present invention in practical applications, but also provide a scientific basis for future technical optimization. The experimental results and their corresponding benefits are summarized as follows:

[0062]

[0063]

[0064] The experimental results are summarized as follows:

[0065] Significant sealing protection effect: Acid-alkali resistant tape and flexible sealant show excellent sealing and corrosion resistance in high-concentration acid and alkali etching liquid environment, ensuring that key components of the LCD screen are not corroded and damaged during the thinning process.

[0066] High thinning precision: The thickness uniformity after chemical thinning is controlled within ±0.02mm, meeting the strict requirements of high-precision display devices and avoiding display problems caused by uneven thickness.

[0067] Strong adaptability: The sealed protection structure adapts to LCD screens of different sizes and shapes through automated dispensing technology, which is especially suitable for small batch and diversified processing needs, and supports the highly customized development of future display devices.

[0068] Combining flexibility and strength: The thinned LCD panel has good flexibility and mechanical strength, and the bending radius can be less than 3mm, making it suitable for flexible displays and wearable devices.

[0069] No residual pollution: The sealing protective material will not cause residue and pollution on the panel surface after removal, ensuring that the optical performance is not affected.

[0070] Improve production efficiency: Efficient use of sealing materials and dispensing control technology reduce manual intervention and error rates, while meeting the processing requirements of high-precision display modules.

[0071] The following are several embodiments based on the above description to demonstrate the practical application scenarios and technical effects of the present invention:

[0072] Example 1: Thinning process for small-size LCD screens

[0073] Background: A customer needs to use a small-sized LCD screen (5 inches) for a wearable device. The customer requires the screen thickness to be reduced to 0.3mm, while the integrity of the COF and PCB must be preserved.

[0074] Implementation process: Use 70-micron-thick acid- and alkali-resistant tape, release film and flexible sealant as protective materials, adhere release film and sealing tape to the CF and TFT surfaces of the LCD panel respectively, focus on covering the COF and PCB areas, inject flexible sealant into the junction area through a dispensing needle to ensure that the gap is completely filled to form a fully enclosed protective structure, use acid etching solution for chemical thinning, reduce the screen thickness to 0.3mm, and ensure that the thickness uniformity is controlled within ±0.02mm. After removing the sealing material, clean the screen and check the surface for residue and pollution.

[0075] Technical effect: The thinned screen achieves a flexible effect with a bending radius of less than 3mm, which can meet the needs of wearable devices, while the COF and PCB remain intact.

[0076] Example 2: High-precision thinning for large-size LCD screens

[0077] Background: An industrial customer needs to thin a 15.6-inch LCD screen to 0.6mm for use in lightweight industrial display equipment, requiring high thickness accuracy and strong surface uniformity.

[0078] Implementation process: Use acid and alkali resistant tape with a thickness of 120 microns to enhance the sealing strength of large-size screens. Use acid and alkali resistant tape with a thickness of 120 microns to enhance the sealing strength of large-size screens. Inject high-fluidity flexible sealant at the joint to ensure complete sealing and seamlessness. Use acid and alkali etching solution for chemical thinning to reduce the thickness to 0.6mm. At the same time, control the thickness uniformity error to less than ±0.02mm. After thinning, gradually remove the protective material, clean the screen and check the optical properties.

[0079] Technical effect: After thinning, the large-size screen has uniform thickness and good mechanical strength, which meets the high-precision requirements of industrial display equipment.

[0080] Example 3: Thinning of flexible display module

[0081] Background: A flexible display manufacturer needs to thin the LCD panel to 0.2mm for use in a flexible display module. The bending radius must be less than 2mm, while protecting the terminals and PCB from corrosion by etching solution.

[0082] Implementation process: Select acid- and alkali-resistant tapes, release films and flexible sealants with a thickness of 90 microns to ensure that the protective materials have excellent corrosion resistance. Attach the protective materials to the CF and TFT surfaces of the LCD panel, and inject flexible sealants to fill the gaps in the junction area. During the chemical thinning stage, strictly control the etching solution concentration and processing time to reduce the thickness to 0.2mm. After removing the protective material, clean the panel and check the surface optical properties and mechanical strength.

[0083] Technical effect: The thinned panel achieves high flexibility, with a bending radius of less than 2mm and unaffected display effect, making it suitable for the production of high-end flexible display devices.

[0084] Example 4: Thinning of LCD Panel with Customized Step Structure

[0085] Background: A medical device manufacturer needs a customized LCD screen. It requires that the original glass thickness of 1.0mm be retained at the edge of the screen (forming a step area) and the middle area be thinned to 0.15mm for use in portable medical imaging equipment.

[0086] Implementation process: Use 120 micron thick acid and alkali resistant tape to protect the edge area, and use release film and sealing tape to cover and protect the middle thinning area. Inject flexible sealant into the junction area to ensure the transition seal between the edge and the middle area is complete. Perform chemical thinning treatment to control the range and depth of the etching solution, retain the original thickness of the edge step area, and thin the middle area to 0.15mm. Remove the protective material and then clean and inspect.

[0087] Technical effect: A customized step structure that meets the needs of medical equipment is formed, which not only ensures the mechanical strength of the screen, but also realizes an ultra-thin middle area, facilitating the lightweight design of the equipment.

[0088] These embodiments demonstrate the application and advantages of the present invention in various scenarios, indicating that it has wide applicability and technical value in the fields of flexible display, industrial equipment, medical equipment and portable equipment.

[0089] Working principle: The working principle of the present invention is based on the key protection requirements in the thinning process of the liquid crystal screen. By constructing a fully enclosed protection structure, it is ensured that the COF, PCB and terminal areas of the liquid crystal panel are not corroded by the chemical etching solution during the chemical thinning process. Specifically, the method first selects an adhesive tape with excellent acid and alkali resistance (thickness 70 to 120 microns), a release film and a flexible sealant as protective materials. These materials have good performance in corrosion resistance, sealing and removability. During the implementation process, the CF surface and the TFT surface are respectively attached to the release film and The sealing tape completely covers the COF, PCB and terminal areas of the LCD screen by laminating the tape and dispensing the glue in the junction area to form a fully enclosed protection area. Among them, the sealing tapes on the CF surface and the TFT surface may form a tiny gap at the junction, so the flexible sealant is injected through the dispensing needle to fill it to ensure that all gaps are completely sealed. The core purpose of this structure is to prevent the etching solution in the chemical thinning process from entering the protection area to avoid corrosion or damage to the key components such as the terminals and circuits of the LCD screen. In the thinning stage, after the sealing protection The liquid crystal screen can withstand the action of chemical etching liquid. By controlling the thinning time and process parameters, the thickness of the panel is adjusted to between 0.1mm and 0.8mm, and the thickness uniformity is controlled within ±0.02mm. The thinned liquid crystal panel retains the step thickness of a specific area, so that the product still has sufficient mechanical strength after thinning, which can meet the requirements of panel strength in actual application scenarios, especially in high bending radius and flexible display applications. After the thinning is completed, the release film, sealing tape and dispensing sealing material are gradually removed to completely expose the thinned liquid crystal panel. The method ensures that no attachments remain during the removal process, and the optical performance and display effect of the thinned panel are maintained to the greatest extent. Finally, the thinned liquid crystal screen can not only meet the requirements of special application scenarios such as high flexibility and ultra-thin modules, but also support high-precision, small-batch customized production, so that it can adapt to the needs of diversified development of modern display technology. The working principle of the present invention realizes safe thinning of complex liquid crystal screens through precise sealing protection structure design and thinning technology, and provides effective technical support for the manufacture of high-performance liquid crystal display screens.

[0090] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the protection scope of the present application.

Claims

1. A method for thinning a liquid crystal screen with COF and PCB, characterized in that: Applicable to LCD panels that have been cut and bonded with COF and PCB, including the following steps: S1: Choose acid and alkali resistant tape suitable for chemical thinning environment, release film with a thickness of 70~120 microns and flexible sealant as protective materials; S2: Seal and protect the COF, PCB and terminal parts of the LCD panel, including: S2.1: Lay the CF surface release film and the CF surface sealing tape in sequence on the area of ​​the CF surface of the liquid crystal panel that needs to be protected; S2.2: Lay the CF surface release film and the CF surface sealing tape on the area of ​​the CF surface of the liquid crystal panel that needs to be protected in sequence; S2.3: Inject sealing structural glue through a dispensing needle at the junction of the CF surface sealing tape and the TFT surface sealing tape to fill the gap and form a completely enclosed protective structure; S3: chemically thinning the sealed and protected liquid crystal panel to adjust the glass thickness to between 0.1 mm and 0.8 mm, and determining the specific thinning thickness according to application requirements; S4: After the thinning is completed, the CF surface release film, the CF surface sealing tape, the TFT surface release film, the TFT surface sealing tape and the gap filling glue at both ends are removed in sequence to expose the thinned liquid crystal glass panel; S5: Clean and inspect the thinned LCD panel to ensure that there is no residue on the panel and that the performance meets the requirements.

2. A method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: The sealing protection structure adopts acid-alkali resistant tape, and the thickness ranges from 70 to 120 microns. The specific thickness can be adjusted according to the size of the liquid crystal panel and the complexity of the terminal area.

3. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: The release film and the sealing tape are surface treated before use to improve their adhesion to the liquid crystal panel and ensure that they will not fall off or leak during the thinning process.

4. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: The CF surface sealing tape and the TFT surface sealing tape are sealed at the junction with each other using a flexible sealant, which is injected through a dispensing needle to ensure that the gap is completely filled and prevent the infiltration of chemical etching liquid.

5. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: Acid and alkaline etching solutions are used in the chemical thinning process, and the sealing protection structure has excellent corrosion resistance to acidic and alkaline chemicals.

6. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: After thinning, the LCD panel forms a step structure. The original glass thickness is retained in the step area, while the thickness of the thinned area is adjusted to between 0.15mm and 0.6mm, customized according to specific application requirements.

7. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: After the thinning is completed, the protective material is removed through an automatic process, and no residue will be left on the surface of the liquid crystal panel after removal, ensuring that the optical and physical properties of the thinned panel are not affected.

8. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: Through the automated dispensing control technology of the sealing structure, it can adapt to LCD panels of different sizes and shapes to meet small-batch and diversified processing needs.

9. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: After chemical thinning, the uniformity of the surface thickness of the LCD panel is controlled within ±0.02mm, meeting the use requirements of high-precision display devices.

10. The method for thinning a liquid crystal screen with COF and PCB according to claim 1, characterized in that: The thinned LCD panel is suitable for special application scenarios, including the design of high-curvature modules and ultra-thin display modules. The bending radius of the thinned LCD panel can be less than 3mm while maintaining the integrity and mechanical strength of the display performance.

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