Improved liquid crystal display screen secondary cutting finishing process

Abstract

The invention discloses an improved liquid crystal display screen secondary cutting and trimming process, and particularly relates to the technical field of liquid crystal display screen processing, which comprises the following steps: SS1, light profile scanning and pre-cutting planning, SS2, precise cutting of an upper polaroid, SS3, flexible fitting and pre-pressing treatment, SS4, integration of an IC (integrated circuit) and an FPC (flexible printed circuit), and formation of pre-cut liquid crystal display FOG (field optical glass) and SS5, high-precision laser cutting and splitting treatment. SS6, laser welding and sealing treatment, SS7, lower polaroid attaching and curing treatment, and SS8, power-on aging and backlight assembly are carried out. By introducing the technologies of laser scanning and planning, automatic precise cutting and flexible fitting, laser welding and sealing treatment and the like, the cutting precision, edge quality and production efficiency of the liquid crystal display screen are remarkably improved, meanwhile, the production cost is reduced, the stability of the production process and the reliability of the product quality are enhanced, and the production efficiency of the liquid crystal display screen is improved. And obvious advantages are brought to the field of liquid crystal display screen manufacturing.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal screen processing, and more specifically, to an improved secondary cutting and trimming process for a liquid crystal display screen. Background Art

[0002] Liquid crystal display is a type of flat-panel display, mainly used for screen displays of televisions and computers. The advantages of this display are low power consumption, small size and low radiation. When processing and manufacturing LCD screens, it is usually necessary to base it on actual size requirements. Often after one cutting, a second cutting is required to meet the different needs of LCD screens.

[0003] After searching, the Chinese patent with publication number CN115453782A discloses a secondary cutting process for LCD screens, which includes the following steps: step SS1: cutting the upper polarizer; step SS2, attaching the upper polarizer to the original size LCD screen glass to be cut; step SS3, binding the LCD glass to be cut to obtain the original size LCD screen FOG; step SS4, cutting the product with a double-blade cutter, and cutting the LCD screen FOG at the corresponding position; step SS5, placing the cut product and performing glass cracking; step SS6, applying glue to seal the cut section; step SS7, curing the glued small size LCD screen FOG; step SS8, attaching the lower polarizer to the cured small size LCD screen FOG; step SS9, assembling the backlight after the LCD screen FOG is powered on and aged. This process does not require cutting the polarizer, but directly attaches the cut polarizer, which reduces the risk of defects.

[0004] However, in actual use, the cut upper polarizer is directly attached to the original-size LCD screen glass to be cut for subsequent cutting, which makes it difficult to ensure the attachment size of the upper polarizer and the original-size LCD screen glass, resulting in inaccurate planning of the cutting path, limited cutting accuracy, and easily leading to a large amount of original-size LCD screen glass being wasted, thereby reducing the utilization rate of the original-size LCD screen glass.

[0005] In view of the above situation, the present invention provides an improved secondary cutting and trimming process for a liquid crystal display screen. Summary of the invention

[0006] In order to overcome the above defects of the prior art, the present invention provides an improved secondary cutting and trimming process for a liquid crystal display screen to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an improved liquid crystal display screen secondary cutting and trimming process, specifically comprising the following steps: SS1, optical contour scanning and pre-cutting planning, use a laser contour scanner to fully scan the original size of the LCD screen, obtain its 3D contour data, and import the scanned 3D contour data into the data analysis software to identify the area to be cut and plan the optimal cutting path; SS2, precision cutting of the upper polarizer, select polarizer material that matches the LCD screen, ensure that its size, thickness and optical performance meet the requirements, use cutting equipment, according to the precise data obtained by laser scanning in step SS1, cut the upper polarizer, and the cutting accuracy is not less than 0.05mm. After cutting, inspect the upper polarizer to ensure that its size, shape and edge quality meet the design requirements; SS3, flexible lamination and pre-pressing treatment, select lamination film and lamination adhesive matching the LCD screen and polarizer, use flexible lamination equipment to laminate the cut upper polarizer onto the LCD screen of original size, control the lamination pressure and temperature during the lamination process to avoid bubbles or wrinkles, and pre-press the laminated LCD screen; SS4, integrate IC and FPC to form pre-cut LCD screen FOG, select IC and FPC that match the LCD screen to ensure its electrical performance and connection reliability, use IC and FPC binding equipment to integrate and bind IC and FPC on the laminated LCD screen; SS5, high-precision laser cutting and crack processing, select laser cutting equipment to cut the LCD screen FOG according to the planned cutting path, the cutting accuracy is not less than 0.1mm, after cutting, the LCD screen FOG is cracked to separate the glass layer in the cutting area to form a small-sized LCD screen FOG; SS6, laser welding and sealing treatment, select laser welding equipment to perform laser welding treatment on the cut LCD screen section to form a dense welding layer, select sealing materials matching the LCD screen to further seal the welding layer, and inspect the LCD screen after sealing to ensure its sealing performance and structural strength; SS7, lower polarizer lamination and curing treatment, select the lower polarizer that matches the LCD screen, use the lamination equipment to laminarize the cut lower polarizer on the welded and sealed LCD screen, and use the curing equipment to cure it to form a complete LCD display module: SS8, power-on aging and backlight assembly, subject the cured LCD display module to a power-on aging test, monitor the electrical performance and stability, select the backlight assembly that matches the LCD display module, assemble the backlight assembly to the LCD display module, and conduct a final inspection on the assembled LCD display module to ensure that its appearance quality, electrical performance and backlight effect meet the design requirements to form the final LCD display module.

[0008] Preferably, in step SS1, the cutting path takes into account the cutting accuracy, cutting speed and edge quality after cutting, the scanning accuracy of the laser contour scanner is not less than 0.01 mm, and the scanning speed of the laser contour scanner can be adjusted according to the size and complexity of the LCD screen to ensure scanning efficiency and data quality.

[0009] Preferably, in step SS3, the laminating film is any one of a polyester film and an optical grade polyvinyl butyral film, and the laminating adhesive includes but is not limited to acrylic adhesive, polyurethane adhesive and silicone adhesive.

[0010] Preferably, in step SS3, the laminating pressure is 0.1-0.5 MPa, the laminating temperature is 25-100° C., and the pre-pressing pressure is 0.05-0.2 MPa.

[0011] Preferably, in step SS4, the binding temperature and pressure are controlled during the binding process to avoid damaging the LCD screen or affecting the electrical connection performance. After binding, the LCD screen FOG is inspected to ensure its electrical connection performance and stability, wherein the binding temperature is 30-150°C and the pressure is 0.1-1MPa.

[0012] Preferably, in the SS6 step, the welding temperature is 500-1000° C., and the welding pressure is 50 Pa-1.2 kPa.

[0013] Preferably, in the SS7 step, the laminating pressure is 0.1-0.5 MPa, the laminating temperature is 25-100° C., the curing temperature is 25-80° C., and the curing time is 5-20 min.

[0014] Technical effects and advantages of the present invention: 1. The present invention can accurately plan the cutting path by comprehensively scanning the original-size LCD screen, and cut the upper polarizer according to the scanning data of the original-size LCD screen, so as to ensure that the attachment size of the upper polarizer and the original-size LCD screen glass is similar, thereby significantly improving the cutting accuracy of the LCD screen, reducing the waste of a large amount of original-size LCD screen glass, and improving the utilization rate of the original-size LCD screen glass; 2. The secondary cutting and trimming process of the liquid crystal display screen of the present invention realizes highly automated production and reduces manual intervention, thereby greatly improving production efficiency, making the entire production process more stable and reliable, and reducing production costs, which not only brings higher economic benefits to the enterprise, but also improves market competitiveness; 3. The present invention can ensure the stability and reliability of the entire production process by controlling the bonding pressure, temperature, and cutting accuracy, which not only improves the product qualification rate, but also reduces the waste and loss in the production process. At the same time, due to the use of laser welding and sealing processing technology, the structural strength and sealing performance of the product are further enhanced, making the final product more in line with the design requirements and improving customer satisfaction and trust. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall flow chart of the present invention. DETAILED DESCRIPTION

[0016] 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.

[0017] The present invention provides an improved liquid crystal display screen secondary cutting and trimming process, which specifically comprises the following steps: SS1, optical contour scanning and pre-cutting planning, select a laser contour scanner with a scanning accuracy of not less than 0.01mm, and conduct a comprehensive scan of the original size LCD screen. Import the scanned 3D contour data into the data analysis software, identify the area to be cut, and plan the optimal cutting path. The planning of the cutting path needs to comprehensively consider the cutting accuracy, cutting speed and edge quality after cutting; This step uses a laser profile scanner, which works on the principle of laser triangulation reflection. The laser profile scanner has a built-in laser generator, which emits a line laser to illuminate the surface of the target to be measured (i.e., the original-size LCD screen). The camera built into the sensor captures the laser reflected from the target surface from a specific angle. Since the distances from different positions of the target to the sensor are different, the reflected laser will fall on different positions of the camera imaging area, thus forming an image containing three-dimensional profile information. The scanned three-dimensional profile data is imported into the data analysis software to identify the area to be cut, and the optimal cutting path is planned by comprehensively considering the cutting accuracy, cutting speed, and edge quality after cutting. This step achieves efficient and high-precision cutting path planning for LCD screens through laser contour scanning and pre-cutting planning, providing a solid foundation for subsequent cutting operations, thereby improving the efficiency of the entire production process and product quality.

[0018] SS2, precision cutting of the upper polarizer, select polarizer material that matches the LCD screen, ensure that its size, thickness and optical performance meet the requirements, use cutting equipment, according to the precise data obtained by laser scanning in step SS1, cut the upper polarizer, and the cutting accuracy is not less than 0.05mm. After cutting, inspect the upper polarizer to ensure that its size, shape and edge quality meet the design requirements; In this step, the polarizer is an important component of the liquid crystal display and is used to control the polarization direction of light. In this step, first of all, it is necessary to select a matching polarizer material according to the specifications and requirements of the liquid crystal display, which includes ensuring that the size, thickness and optical properties (such as transmittance, polarization degree, etc.) of the polarizer meet the design requirements. In step SS1, the precise three-dimensional contour data of the liquid crystal display has been obtained through a laser contour scanner, and the optimal cutting path has been planned. In step SS2, these precise data are used to guide the cutting of the polarizer. Based on these data, the cutting equipment can accurately cut the polarizer to ensure that the cut polarizer completely matches the size and shape of the liquid crystal display. The cutting equipment usually adopts a high-precision mechanical structure and control system to ensure that the cutting accuracy is not less than 0.05mm, which can ensure that the edge of the cut polarizer is smooth and burr-free, and the size and shape meet the design requirements.

[0019] SS3, flexible lamination and pre-pressing treatment, select polyester film or optical grade polyvinyl butyral film as lamination film, select acrylic glue, polyurethane glue or silicone glue as lamination glue, use flexible lamination equipment, laminate the cut upper polarizer on the original size of the LCD screen, control the lamination pressure and temperature during the lamination process, the lamination pressure is 0.1-0.5MPa, the lamination temperature is 25-100℃, avoid bubbles or wrinkles, and pre-press the laminated LCD screen with a pre-pressing pressure of 0.05-0.2MPa; In this step, during the flexible lamination process, it is necessary to select a laminating film and a laminating adhesive that are compatible with the liquid crystal display and the upper polarizer. Among them, polyester film or optical grade polyvinyl butyral film is often used as a laminating film due to its good optical properties and mechanical strength, while acrylic adhesive, polyurethane adhesive or silicone adhesive is often used as a laminating adhesive due to its good bonding properties and weather resistance; The flexible laminating equipment precisely controls the laminating pressure and temperature to laminate the cut upper polarizer onto the original-sized LCD screen. During the laminating process, it is necessary to ensure that there are no bubbles or wrinkles between the laminating film, the LCD screen, and the upper polarizer to ensure the laminating quality. Lamination pressure and temperature are key factors affecting lamination quality. Appropriate lamination pressure can ensure close contact between the lamination film and the LCD screen and the upper polarizer, while appropriate lamination temperature can improve the fluidity of the lamination adhesive, allowing it to better fill the tiny gaps between the lamination surfaces. After lamination, the LCD screen is pre-pressed to further eliminate bubbles or wrinkles that may be generated during the lamination process and enhance the adhesion of the lamination film. The pre-pressing pressure needs to be controlled within a certain range to avoid damage to the LCD screen.

[0020] SS4, integrate IC and FPC to form pre-cut LCD screen FOG, select IC and FPC that match the LCD screen to ensure its electrical performance and connection reliability, use IC and FPC binding equipment to perform integrated binding of IC and FPC on the laminated LCD screen, control the binding temperature and pressure during the binding process, the binding temperature is 30-150℃, and the pressure is 0.1-1MPa to avoid damaging the LCD screen or affecting the electrical connection performance, and inspect the LCD screen FOG after binding to ensure its electrical connection performance and stability; In this step, you need to select ICs (integrated circuits) and FPCs (flexible printed circuit boards) that match the LCD screen. The electrical performance and connection reliability of these components are crucial to the final performance of the LCD screen. When selecting, you need to ensure that the function, power consumption, and size of the IC match the LCD screen, and the conductivity, flexibility, and durability of the FPC also need to meet the design requirements. Bonding is the process of electrically connecting the IC and FPC to the electrodes on the LCD screen, usually using hot pressing bonding or ultrasonic bonding. During the bonding process, the bonding temperature and pressure need to be precisely controlled to ensure good electrical connection and mechanical strength while avoiding damage to the LCD screen. The bonding temperature and pressure are key factors affecting the quality of bonding. The appropriate bonding temperature can ensure the melting and solidification of the bonding glue to form a good electrical connection, while the appropriate bonding pressure can ensure close contact between the IC and FPC and the LCD screen, improving the reliability of the connection. After the bonding is completed, the LCD screen FOG (Flexible on GlaSSSS, circuit on flexible glass) needs to be inspected to ensure its electrical connection performance and stability. This usually includes electrical performance testing, connection reliability testing, and durability testing.

[0021] SS5, high-precision laser cutting and crack processing, select laser cutting equipment to cut the LCD screen FOG according to the planned cutting path, the cutting accuracy is not less than 0.1mm, after cutting, the LCD screen FOG is cracked to separate the glass layer in the cutting area to form a small-sized LCD screen FOG; In this step, high-precision laser cutting equipment is used to cut the LCD screen FOG. The principle of laser cutting is to use the high energy density of the laser beam to focus the laser beam on the cutting path of the LCD screen FOG through a focusing lens, so that the material in the cutting area is quickly heated up and reaches the melting point or vaporization point, thereby achieving cutting. Since the laser beam has a small focal point and high energy density, high-precision cutting can be achieved; After cutting, the LCD screen FOG needs to be cracked. The principle of cracking is to use mechanical or chemical methods to separate the glass layers in the cutting area. This usually involves applying a certain external force on the cutting path, or using chemical reactions to reduce the adhesion between the glass layers to achieve separation. Before laser cutting, the cutting path needs to be planned according to the product design requirements and the layout of the LCD screen FOG. The planning of the cutting path needs to comprehensively consider factors such as cutting accuracy, cutting efficiency, and edge quality after cutting.

[0022] SS6, laser welding and sealing treatment, select laser welding equipment to perform laser welding treatment on the cut LCD screen section, the welding temperature is 500-1000℃, the welding pressure is 50Pa-1.2kPa, to form a dense welding layer, select sealing materials matching the LCD screen to further seal the welding layer, and inspect the LCD screen after sealing to ensure its sealing performance and structural strength; In this step, laser welding can partially melt the material and re-solidify it to achieve connection. The laser welding equipment heats the cut LCD screen section by focusing a high-energy laser beam, causing it to melt rapidly and form a dense welding layer, which makes the product have good strength and toughness, and can enhance the structural strength of the LCD screen and improve its impact and vibration resistance. By selecting sealing materials that match the LCD screen, such as epoxy resin, silicone, etc., the welding layer is further sealed to make the product have good adhesion, weather resistance and chemical stability, so as to ensure that the LCD screen is not affected by the external environment during long-term use.

[0023] SS7, lower polarizer lamination and curing treatment, select the lower polarizer that matches the LCD screen, use the lamination equipment to laminat the cut lower polarizer on the fused and sealed LCD screen, the lamination pressure is 0.1-0.5MPa, the lamination temperature is 25-100℃, and the curing equipment is used for curing, the curing temperature is 25-80℃, and the curing time is 5-20min to form a complete LCD display module; In this step, the lower polarizer is an important component of the liquid crystal display module. It can convert the light beam generated by the backlight source into polarized light and is the key to the liquid crystal display to realize image display. The bonding equipment precisely controls the bonding pressure and temperature to bond the cut lower polarizer to the welded and sealed liquid crystal screen to ensure good bonding between the lower polarizer and the liquid crystal screen. The bonded liquid crystal display module is heated by the curing equipment to make the adhesive undergo a chemical reaction and solidify, thereby forming a stable bonding structure.

[0024] SS8, power-on aging and backlight assembly, conduct power-on aging test on the cured LCD module, monitor the electrical performance and stability, select the backlight assembly that matches the LCD module, assemble the backlight assembly onto the LCD module, and conduct final inspection on the assembled LCD module to ensure that its appearance quality, electrical performance and backlight effect meet the design requirements to form the final LCD module; In this step, the cured LCD display module is placed in a power-on state and operated and monitored for a certain period of time to evaluate its electrical performance and stability, simulate the working environment of the LCD display module in actual use, and detect whether there are potential electrical faults or performance instability problems. By monitoring the electrical performance and stability, potential problems can be discovered and resolved in a timely manner to ensure the quality and reliability of the LCD display module.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An improved secondary cutting and trimming process for liquid crystal display screens, Features: The specific steps include: SS1, light profile scanning and pre-cutting planning; SS2, precision cutting of polarizer; SS3, flexible bonding and pre-pressing treatment; SS4, integrate IC and FPC to form pre-cut LCD screen FOG; SS5, high-precision laser cutting and splinter processing; SS6, laser welding and sealing treatment; SS7, lower polarizer lamination and curing process.

2. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The SS1 step is to use a laser profile scanner to fully scan the original-size LCD screen to obtain its three-dimensional profile data, and then import the scanned three-dimensional profile data into the data analysis software to identify the area to be cut and plan the optimal cutting path; The cutting path takes into account the cutting accuracy, cutting speed and edge quality after cutting. The scanning accuracy of the laser contour scanner is not less than 0.01 mm. The scanning speed of the laser contour scanner can be adjusted according to the size and complexity of the LCD screen to ensure scanning efficiency and data quality.

3. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The specific steps of SS2 are: select polarizer material that matches the liquid crystal display screen, ensure that its size, thickness and optical performance meet the requirements, use cutting equipment to cut the upper polarizer according to the precise data obtained by laser scanning in step SS1, and the cutting accuracy is not less than 0.05mm. After cutting, inspect the upper polarizer to ensure that its size, shape and edge quality meet the design requirements.

4. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The SS3 step specifically includes selecting a laminating film and laminating adhesive that matches the LCD screen and polarizer, using a flexible laminating device to laminate the cut upper polarizer onto the LCD screen of original size, controlling the laminating pressure and temperature during the laminating process to avoid bubbles or wrinkles, and pre-pressing the laminated LCD screen; The laminating film is any one of a polyester film and an optical grade polyvinyl butyral film, and the laminating adhesive includes acrylic adhesive, polyurethane adhesive and silicone adhesive; The laminating pressure is 0.1-0.5 MPa, the laminating temperature is 25-100° C., and the pre-pressing pressure is 0.05-0.2 MPa.

5. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The specific steps of SS4 are to select IC and FPC that match the LCD screen, ensure their electrical performance and connection reliability, and use IC and FPC binding equipment to perform integrated binding of IC and FPC on the laminated LCD screen; During the binding process, the binding temperature and pressure are controlled to avoid damaging the LCD screen or affecting the electrical connection performance. After binding, the LCD screen FOG is inspected to ensure its electrical connection performance and stability. The binding temperature is 30-150°C and the pressure is 0.1-1MPa.

6. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The SS5 step is specifically to select a laser cutting device to cut the LCD screen FOG according to the planned cutting path, with a cutting accuracy of not less than 0.1 mm. After the cutting is completed, the LCD screen FOG is cracked to separate the glass layer in the cutting area to form a small-sized LCD screen FOG.

7. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The SS6 step specifically includes: selecting a laser welding device to perform laser welding on the cut LCD screen section to form a dense welding layer; selecting a sealing material matching the LCD screen to further seal the welding layer; and inspecting the LCD screen after sealing to ensure its sealing performance and structural strength; The welding temperature is 500-1000° C., and the welding pressure is 50 Pa-1.2 kPa.

8. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: The SS7 step specifically includes selecting a lower polarizer that matches the LCD screen, using a laminating device to laminate the cut lower polarizer onto the welded and sealed LCD screen, and curing it through a curing device to form a complete LCD display module; The laminating pressure is 0.1-0.5 MPa, the laminating temperature is 25-100° C., the curing temperature is 25-80° C., and the curing time is 5-20 min.

9. The improved liquid crystal display secondary cutting and trimming process according to claim 1, Features: It also includes SS8, power-on aging and backlight assembly. The cured LCD display module is subjected to power-on aging test to monitor the electrical performance and stability, and the backlight component that matches the LCD display module is selected and assembled onto the LCD display module. The assembled LCD display module is subjected to final inspection to ensure that its appearance quality, electrical performance and backlight effect meet the design requirements to form the final LCD display module.

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