Structure and method for eliminating Moore interference fringes of LED display screen

Abstract

The invention relates to the technical field of LED display screens, and discloses a method for eliminating Moore interference fringes of an LED display screen, which comprises the following steps: designing irregular patterns; according to the pixel arrangement and size of the LED display screen, an irregular pattern composed of a plurality of polygons with different shapes and angles is designed; manufacturing a metal grid; the designed irregular patterns are manufactured on the metal film through precision machining, a metal grid is formed, and the metal film is made of materials with good conductivity and light transmission; overlapping the metal grids; the manufactured metal grid and a liquid crystal particle layer of the LED display screen are overlapped, and it is ensured that patterns of the metal grid are matched with pixel arrangement of the liquid crystal particle layer. According to the structure and method for eliminating the Moire interference fringes of the LED display screen, the Moire fringes are reduced through the irregular eight-grid pattern design scheme, and therefore unnecessary consumption of manpower and material resources is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of LED display screens, and in particular to a structure and a method for eliminating moiré interference fringes on an LED display screen. Background Art

[0002] In the current market, many manufacturers have entered the production field of Metal Mesh, a new conductive transparent material. With its unique advantages, Metal Mesh is gradually becoming an indispensable key component in many electronic products. Its most significant advantage is that it can significantly improve the structural design of the whole module, making it lighter and thinner, which greatly satisfies the pursuit of modern consumers for thinner electronic products. In terms of optical performance, Metal Mesh exhibits excellent optical transmittance, which means that the display screen using this material can present clearer and brighter images, bringing users a better visual experience. At the same time, Metal Mesh can also effectively improve the display quality while ensuring conductive performance, making the picture more delicate and realistic.

[0003] Although the application of existing Metal Mesh technology in electronic products has brought many advantages such as lightness, high transmittance and cost-effectiveness, it is also accompanied by a technical defect that cannot be ignored, which is the generation of moiré. This defect has a significant impact on production design. Design factors such as the diagonal pitch, angle and angle between the stripes will have a comprehensive effect on the display effect of the moiré, making it difficult for designers to accurately predict and control the generation of moiré in the early stage. Although reducing moiré by changing the grid angle has become a conventional means, this method cannot completely eliminate the existence of moiré. The universality and objectivity of moiré make many products expose obvious moiré problems in the proofing stage, forcing designers to temporarily change the design plan. This process not only increases the manpower, financial and material costs of production, but may also delay product launch time and affect market competitiveness. Summary of the invention

[0004] The purpose of the present invention is to reduce moiré fringes through an irregular eight-grid pattern design, thereby reducing unnecessary consumption of manpower and material resources, and to propose a structure and method for eliminating moiré fringes on an LED display screen.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A method for eliminating moiré fringes on an LED display screen comprises the following steps:

[0007] S10, designing an irregular pattern: according to the pixel arrangement and size of the LED display screen, designing an irregular pattern composed of multiple polygons with different shapes and angles;

[0008] S20, making a metal grid; using precision machining to make the designed irregular pattern on the metal film to form a metal grid, and the material of the metal film is selected from a material with good electrical conductivity and light transmittance;

[0009] S30, superimposing a metal grid; superimposing the prepared metal grid and the liquid crystal particle layer of the LED display screen, ensuring that the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer;

[0010] S40, optimizing the superposition effect; optimizing the superposition effect by adjusting the superposition angle and position of the metal grid until the best effect of eliminating the moiré interference pattern is achieved.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the polygon is arranged in an irregular shape of an octagonal grid, and each side length and angle is accurately calculated according to the following formula;

[0013] f moire =|f1-f2|

[0014] Among them, f moire represents the spatial frequency of the moiré interference fringe, f1 and f2 represent the spatial frequencies of the two layers of film, respectively. By designing an irregular octagonal pattern, the spatial frequency of the two layers of film after superposition changes, thereby reducing f moire The value of the polygon should also be adjusted so that the spatial frequency f of the moiré fringe is moire All of them can meet the preset threshold requirements.

[0015] Furthermore, the material of the metal film is one of nano-copper or nano-silver, and the line width w and spacing s of the metal grid need to satisfy the relationship: w / s=k×PPI, where k is the proportionality coefficient and PPI is the pixel density of the LED display screen, to ensure that the metal grid and the pixels of the LED display screen perfectly match. In step S20, the precision processing adopts one of photolithography technology, electron beam etching technology or laser processing technology.

[0016] Furthermore, before superimposing the metal grid in step S30, the metal grid needs to be cleaned to remove stains and impurities on the surface. The cleaning of the metal grid adopts ultrasonic cleaning technology to remove stains and impurities on the surface of the metal grid through high-frequency vibration while avoiding damage to the metal grid. The surface roughness Ra of the metal grid after cleaning needs to be less than 0.1μm to ensure the superposition effect.

[0017] Furthermore, in step S40, when optimizing the superposition effect, an interferometer is used to perform a moiré interference fringe test on the superimposed display screen. According to the test results, the superposition angle and position of the metal grid are fine-tuned until the contrast of the moiré interference fringe is lower than a preset threshold, so as to achieve complete elimination of the moiré interference fringe.

[0018] Furthermore, the method also includes the following steps: performing quality inspection on the LED display screen after eliminating the moiré interference fringes, ensuring that the clarity and visual comfort of the display screen meet preset standards, the quality inspection including brightness uniformity test, color reproduction test, contrast test and viewing angle test, the quality inspection also includes performing environmental adaptability test on the LED display screen after eliminating the moiré interference fringes, including performance test under extreme environments of high temperature, low temperature and humidity, ensuring that the display screen can maintain good clarity and visual comfort in different environments.

[0019] Furthermore, in the step S20, when making the metal grid, the metal film needs to be pre-treated, including annealing and surface flattening, to improve the conductivity and light transmittance of the metal grid, while ensuring the accuracy of the line width and spacing of the metal grid.

[0020] A structure for eliminating moiré fringes on an LED display screen, comprising an LED display screen and a metal grid, wherein the metal grid covers a liquid crystal particle layer of the LED display screen, and the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0022] The design of the irregular pattern in step S10 of the present invention is a key innovation. Traditionally, metal grids often adopt regular geometric shapes, such as square or rectangular grids, which easily interfere with the grid structure of the camera CCD or other imaging devices, thereby forming moiré patterns. The present method carefully designs an irregular pattern composed of multiple polygons with different shapes and angles according to the pixel arrangement and size of the LED display screen. This design breaks the limitations of traditional regular grids and reduces the similarity with the grid structure of the imaging device, thereby reducing the possibility of moiré patterns. In step S20, the designed irregular pattern is made on the metal film by precision processing technology to form a metal grid. This step ensures the accuracy and consistency of the metal grid, so that the irregular pattern can be accurately realized, further enhancing the effect of eliminating moiré patterns. At the same time, the selection of metal film materials It is also crucial that the method uses materials with good conductivity and light transmittance to ensure that the metal grid will not sacrifice the optical performance of the display screen while improving the conductivity. In step S30, the prepared metal grid is superimposed on the liquid crystal particle layer of the LED display screen, and it is ensured that the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer. This step ensures the precise alignment between the metal grid and the display screen pixels, avoids additional interference fringes caused by misalignment, and further improves the effect of eliminating moiré. Finally, in step S40, the superposition effect is optimized by adjusting the superposition angle and position of the metal grid. This step allows fine-tuning according to specific circumstances in actual applications to achieve the best effect of eliminating moiré interference fringes. This flexibility enables the method to adapt to LED displays of different models and resolutions, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the irregular eight-square grid design of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of a metal grid of the present invention;

[0025] Figure 3 This is a schematic diagram of another metal grid connection structure of the present invention;

[0026] Figure 4 This is a diagram showing the superposition effect of two metal grids of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] Combination Figure 1-Figure 4 As shown, a method for eliminating moiré fringes on an LED display screen of the present invention comprises the following steps:

[0029] S10, designing an irregular pattern: according to the pixel arrangement and size of the LED display screen, designing an irregular pattern composed of multiple polygons with different shapes and angles;

[0030] S20, making a metal grid; using precision machining to make the designed irregular pattern on the metal film to form a metal grid, and the material of the metal film is selected from a material with good electrical conductivity and light transmittance;

[0031] S30, superimposing a metal grid; superimposing the prepared metal grid and the liquid crystal particle layer of the LED display screen, ensuring that the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer;

[0032] S40, optimizing the superposition effect; optimizing the superposition effect by adjusting the superposition angle and position of the metal grid until the best effect of eliminating the moiré interference pattern is achieved.

[0033] In a preferred embodiment, the present invention can be further configured as follows: the polygon is arranged in an irregular shape of an octagonal grid, and each side length and angle is accurately calculated according to the following formula;

[0034] f moire =|f1-f2|

[0035] Among them, f moire represents the spatial frequency of the moiré interference fringe, f1 and f2 represent the spatial frequencies of the two layers of film, respectively. By designing an irregular octagonal pattern, the spatial frequency of the two layers of film after superposition changes, thereby reducing f moire The value of the polygon should also be adjusted so that the spatial frequency f of the moiré fringe is ,oireAll of them can meet the preset threshold requirements. The proposed polygon is an irregular shape of an eight-square grid, and each side length and angle is accurately calculated according to a specific formula. By designing an irregular eight-square grid pattern, the limitations of the traditional regular grid are broken, so that the spatial frequency of the two layers of film (i.e., the metal grid and the liquid crystal particle layer of the LED display) after superposition changes. This change helps to reduce the spatial frequency value of the moiré interference pattern, thereby reducing the generation of moiré. Secondly, by accurately calculating the side length and angle of the polygon, it can be ensured that the spatial frequency of the moiré interference pattern can meet the preset threshold requirements at any viewing angle. This feature enhances the stability and consistency of the moiré elimination effect, and improves the visual effect and user experience of the display.

[0036] Suppose there is an LED display screen, whose liquid crystal particle layer has a spatial frequency of 100 lines / mm, and the metal grid layer has a spatial frequency of 120 lines / mm. According to the formula, the spatial frequency of the moiré interference fringes can be calculated. In order to reduce this value, an irregular eight-square grid pattern is designed, in which the side length and angle of each polygon are accurately calculated. The side length of a polygon may vary from 0.5 mm, 0.7 mm, and 1 mm, while the angle may be 30 degrees, 60 degrees, and 90 degrees, etc. Through such a design, the spatial frequency of the two layers of film superposition is successfully changed, so that the spatial frequency of the moiré interference fringes is reduced to below the preset threshold. In actual viewing, no matter how the observer's angle changes, the generation of moiré fringes is effectively suppressed, thereby improving the display quality and user experience of the display screen.

[0037] In a preferred embodiment, the present invention can be further configured as follows: the material of the metal film is one of nano copper or nano silver, and the line width w and spacing s of the metal grid need to satisfy the relationship: w / s=k×PPI, where k is the proportional coefficient and PPI is the pixel density of the LED display screen, so as to ensure that the metal grid and the pixels of the LED display screen are perfectly matched. In step S20, the precision processing adopts one of the photolithography technology, electron beam etching technology or laser processing technology, and nano copper or nano silver is used as the material of the metal film. These two materials not only have good conductivity and light transmittance, but also their nano-scale size makes the metal grid more delicate, which helps to reduce the scattering and reflection of light, thereby reducing the generation of moiré interference fringes. Secondly, by accurately controlling the line width w and spacing s of the metal grid, so that it satisfies the relationship w / s=k×PPI, where k is the proportional coefficient and PPI is the pixel density of the LED display screen, this design ensures that the metal grid and the pixels of the LED display screen are perfectly matched. This matching not only helps to improve the clarity of the display effect, but also further reduces the generation of moiré fringes and improves the user's visual experience. Finally, in step S20, precision processing is performed using one of the photolithography technology, electron beam etching technology or laser processing technology. These technologies have the characteristics of high precision and high efficiency, and can ensure that the pattern and size of the metal grid meet the design requirements, thereby further improving the effect of eliminating moiré interference fringes.

[0038] In practical applications, the value of the proportionality coefficient k needs to be accurately calculated based on the pixel density PPI of the LED display. Generally speaking, the value range of k can be between 0.5 and 2, and the specific value depends on the resolution of the display, the viewing distance, and the user's requirements for the display effect. For example, for a high-resolution LED display, in order to obtain a more delicate display effect, the value of k can be close to 1, so that the line width w and spacing s of the metal grid will be closer, which will help reduce the diffraction and interference effects of light, thereby reducing the generation of moiré interference fringes. At the same time, in actual operation, the pattern of the metal grid can be drawn using computer-aided design software, and then the pattern can be imported into the photolithography machine for processing. After the processing is completed, the line width w, spacing s, and pattern accuracy of the metal grid are tested by the detection instrument to ensure that the design requirements are met. This processing method not only improves the production accuracy of the metal grid, but also greatly shortens the production cycle and reduces production costs.

[0039] In a preferred embodiment, the present invention can be further configured as follows: before superimposing the metal grid in step S30, the metal grid needs to be cleaned to remove stains and impurities on the surface. The cleaning of the metal grid adopts ultrasonic cleaning technology, and removes stains and impurities on the surface of the metal grid by high-frequency vibration, while avoiding damage to the metal grid. The surface roughness Ra of the cleaned metal grid needs to be less than 0.1 μm to ensure the superposition effect. Before superimposing the metal grid, an important step of cleaning the metal grid is added. The ultrasonic cleaning technology can efficiently remove stains and impurities on the surface of the metal grid. If these stains and impurities are not removed in time, they may form additional interference sources when the metal grid is superimposed with the liquid crystal particle layer of the LED display screen, exacerbating the generation of moiré interference fringes. The surface of the metal grid after cleaning is cleaner, which helps to improve the superposition effect, make the contact between the metal grid and the liquid crystal particle layer closer, and reduce display problems caused by poor contact. Secondly, the ultrasonic cleaning technology removes stains and impurities by high-frequency vibration. In this process, no physical damage will be caused to the metal grid, ensuring the integrity and conductivity of the metal grid. Finally, the surface roughness Ra of the metal grid after cleaning needs to be less than 0.1μm. This requirement ensures the flatness of the metal grid surface, helps to improve the display effect, reduce light scattering and reflection, and further reduce the generation of moiré interference fringes.

[0040] During the cleaning process of the metal mesh, ultrasonic cleaning technology generates tiny bubbles through high-frequency vibration. These bubbles expand and burst rapidly in the liquid, generating a strong impact force to shake off the stains and impurities on the surface of the metal mesh. At the same time, due to the non-contact characteristics of ultrasonic cleaning technology, it avoids the damage to the metal mesh caused by friction or brushing in traditional cleaning methods.

[0041] In actual operation, the metal grid can be placed in the cleaning tank of the ultrasonic cleaning machine, add an appropriate amount of cleaning liquid, and then start the ultrasonic cleaning machine. During the cleaning process, the frequency and cleaning time of the ultrasonic wave can be adjusted according to the degree of stains and material of the metal grid. After cleaning, rinse the metal grid with pure water to remove the residual cleaning liquid, and then use nitrogen or a drying oven to dry the metal grid. Finally, use a surface roughness measuring instrument to detect the surface roughness of the cleaned metal grid to ensure that the Ra requirement of less than 0.1μm is met. Such a cleaning process not only improves the cleanliness and flatness of the metal grid, but also provides a good foundation for the subsequent superposition steps, ensuring the display effect of the LED display and the effect of eliminating moiré interference fringes.

[0042] In a preferred embodiment, the present invention can be further configured as follows: in step S40, when optimizing the superposition effect, an interferometer is used to test the moiré fringe of the superimposed display screen, and according to the test results, the superposition angle and position of the metal grid are fine-tuned until the contrast of the moiré fringe is lower than the preset threshold value, so as to achieve complete elimination of the moiré fringe, introduce an interferometer to test the moiré fringe of the superimposed display screen, and fine-tune the superposition angle and position of the metal grid according to the test results until the contrast of the moiré fringe is lower than the preset threshold value, significantly improving the effect of eliminating the moiré fringe, ensuring the display quality of the LED display screen, and through the test of the interferometer, the distribution and contrast of the moiré fringe can be intuitively observed, thereby guiding the subsequent fine-tuning of the metal grid. Secondly, fine-tuning is performed according to the test results to ensure the precise alignment between the metal grid and the liquid crystal particle layer of the LED display screen, avoiding additional interference fringes caused by misalignment. Finally, by continuously iterating the fine-tuning process until the contrast of the moiré fringe is lower than the preset threshold value, the moiré fringe is completely eliminated, and the visual effect and user experience of the display screen are improved.

[0043] The presence and contrast of moiré fringes are evaluated by measuring the interference fringes generated by the superimposed light waves on the display surface. In actual operation, the interferometer emits a beam of monochromatic light, which is divided into two beams after passing through a beam splitter. One beam is directly irradiated onto the display, and the other beam is irradiated onto the display after a certain optical path difference. The two beams of light meet and interfere on the surface of the display, forming interference fringes. The interferometer can calculate the contrast and distribution of moiré fringes by capturing images of these interference fringes, processing and analyzing them.

[0044] In actual operation, the superimposed LED display screen can be placed on the test platform of the interferometer, and the parameters of the interferometer, such as the wavelength of the light source, the optical path difference, etc., can be adjusted to ensure the accuracy of the test results. Then, the interferometer is started for testing, and the image of the interference fringes is observed and recorded. According to the distribution and contrast of the interference fringes in the image, the severity of the moiré interference fringes can be judged, and the superposition angle and position of the metal grid can be fine-tuned accordingly. During the fine-tuning process, the inclination angle and horizontal position of the metal grid can be gradually adjusted, and the test is repeated after each adjustment until the contrast of the interference fringes is reduced to below the preset threshold, and the moiré interference fringes are completely eliminated. Such a testing and optimization process not only improves the efficiency of eliminating moiré interference fringes, but also ensures that the display quality of the LED display screen reaches the best state.

[0045] In a preferred embodiment, the present invention can be further configured as follows: it also includes the following steps: quality inspection of the LED display screen after eliminating the moiré interference fringe, ensuring that the clarity and visual comfort of the display screen meet the preset standards, the quality inspection includes brightness uniformity test, color reproduction test, contrast test and viewing angle test, the quality inspection also includes environmental adaptability test of the LED display screen after eliminating the moiré interference fringe, including performance test under extreme environments of high temperature, low temperature and humidity, ensuring that the display screen can maintain good clarity and visual comfort under different environments, on the basis of eliminating the moiré interference fringe, adding important steps of quality inspection and environmental adaptability test of the LED display screen, the quality inspection covers brightness uniformity test, color reproduction test, contrast test and viewing angle test, these test items comprehensively evaluate the key performance indicators of the display screen such as clarity, color accuracy and viewing angle, ensuring that the display screen can still maintain excellent display effect after eliminating the moiré interference fringe. Secondly, the environmental adaptability test simulates extreme environmental conditions such as high temperature, low temperature and humidity, and strictly tests the performance of the display screen. This step not only verifies the stability and reliability of the display in different environments, but also ensures that the display can maintain good clarity and visual comfort in various usage scenarios, thereby improving the applicability and durability of the display.

[0046] In terms of quality inspection, the brightness uniformity test evaluates whether the brightness distribution of the display screen is uniform by measuring the brightness difference of each area of ​​the display screen, which is crucial to avoid uneven brightness and darkness on the screen. The color reproduction test evaluates the color accuracy of the display screen by comparing the difference between the color displayed on the display screen and the standard color to ensure the authenticity of the displayed content. The contrast test measures the brightness difference between the brightest and darkest parts of the display screen. High contrast helps to improve the layering and detail expression of the picture. The viewing angle test evaluates the viewing angle range of the display screen by observing the display effect of the display screen at different viewing angles to ensure that users can get a good viewing experience at different positions. In terms of environmental adaptability testing, the high temperature test simulates the working state of the display screen in a high temperature environment to evaluate whether the display screen will experience performance degradation or failure at high temperature. The low temperature test simulates the performance of the display screen in a cold environment to ensure that the display screen can still work normally at low temperatures. The humidity test evaluates the stability and corrosion resistance of the display screen under humid conditions by simulating a high humidity environment. These tests not only help to discover potential problems of the display screen in extreme environments, but also provide valuable data support for the design and optimization of the display screen. For example, when conducting a high temperature test, the display screen can be placed in a constant temperature box, set the high temperature condition (such as 50°C), and continuously observe the working status and display effect of the display screen. By recording and analyzing the test data, the stability and reliability of the display screen at high temperatures can be evaluated, thereby guiding subsequent improvements and optimizations. Such a testing process ensures that the LED display screen can maintain excellent performance and user experience in various usage scenarios after eliminating moiré interference fringes.

[0047] In a preferred embodiment, the present invention can be further configured as follows: In step S20, when making a metal grid, the metal film needs to be pre-treated, including annealing and surface flattening, to improve the conductivity and light transmittance of the metal grid, while ensuring the accuracy of the line width and spacing of the metal grid. The pre-treatment of the metal film, including annealing and surface flattening, is introduced, while ensuring the accuracy of the line width and spacing of the metal grid, providing a strong guarantee for eliminating moiré interference fringes. First, the annealing treatment can effectively eliminate the residual stress and structural defects inside the metal by heating the metal film to a certain temperature and then slowly cooling it, and improve the electrical conductivity and mechanical properties of the metal. This helps the metal grid maintain stable conductivity during subsequent processing and use, and reduces signal loss caused by resistance changes. Secondly, the surface flattening treatment removes tiny protrusions and depressions on the surface of the metal film by mechanical polishing, chemical etching or ion beam polishing, making the metal surface smoother and flatter. This not only improves the light transmittance of the metal grid and reduces light scattering and reflection, but also helps to precisely control the line width and spacing of the metal grid, thereby reducing the chance of moiré interference fringes.

[0048] In terms of annealing treatment, the choice of annealing temperature is the key, which needs to be determined according to the type and thickness of the metal. For example, for copper film, the annealing temperature is usually selected between 200-300℃ to maintain the stability of the internal structure of the metal, while avoiding excessive temperature causing metal oxidation or evaporation. The control of annealing time is also very important. Too long or too short annealing time may affect the annealing effect. In terms of surface flattening treatment, mechanical polishing is suitable for thicker metal films, and surface defects are removed by the mechanical action of abrasive particles. Chemical etching is suitable for thinner metal films, and surface materials are removed by chemical reaction to achieve the purpose of flattening. Ion beam polishing is a high-precision flattening method that uses ion beams to accurately etch the metal surface, which can achieve nanometer-level surface flatness.

[0049] In actual operation, copper can be selected as the material of the metal film. First, the copper film is annealed in a vacuum environment at a temperature of 250°C for about 30 minutes. After annealing, the surface of the copper film is flattened, and a chemical etching method is used to remove the tiny bumps and depressions on the surface of the copper film using a specific etching solution and etching parameters. The conductivity and light transmittance of the pretreated copper film are significantly improved, and the line width and spacing accuracy of the metal grid are also effectively controlled. Such a pretreatment process not only provides a good foundation for the subsequent metal grid production, but also helps to eliminate moiré interference fringes and improve the display effect and user experience of the LED display.

[0050] In step S10, an irregular pattern consisting of multiple polygons of different shapes and angles (such as irregular shapes of eight-square grids) is designed according to the pixel arrangement and size of the LED display screen. The side lengths and angles of these polygons are accurately calculated to change the spatial frequency after the two layers of film are superimposed, thereby reducing the spatial frequency value of the moiré interference fringes, ensuring that the spatial frequency of the moiré interference fringes can meet the preset threshold requirements at any viewing angle. Then, in step S20, the designed irregular pattern is made on a metal film using precision processing technology (such as photolithography technology, electron beam etching technology or laser processing technology) to form a metal grid. The material of the metal film is selected from materials with good conductivity and light transmittance such as nano copper or nano silver. Before making the metal grid, the metal film needs to be pre-treated, including annealing and surface flattening treatment, to improve the conductivity and light transmittance of the metal grid and ensure the accuracy of the line width and spacing of the metal grid. Then, in step S30, the prepared metal grid is bonded to the LED The liquid crystal particle layer of the display screen is superimposed. Before superimposition, the metal grid needs to be cleaned and ultrasonic cleaning technology is used to remove surface stains and impurities to ensure that the surface roughness Ra of the metal grid is less than 0.1μm to ensure a good superimposition effect. During the superimposition process, it is necessary to ensure that the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer. In step S40, the superimposed display screen is tested for moiré interference fringes through an interferometer. According to the test results, the superimposition angle and position of the metal grid are fine-tuned until the contrast of the moiré interference fringes is lower than the preset threshold, thereby achieving complete elimination of the moiré interference fringes. Finally, the LED display screen after eliminating the moiré interference fringes is subjected to quality inspection, including brightness uniformity test, color reproduction test, contrast test and viewing angle test, to ensure that the clarity and visual comfort of the display screen meet the preset standards. At the same time, environmental adaptability tests are also required, including performance tests under extreme environments of high temperature, low temperature and humidity, to ensure that the display screen can maintain good clarity and visual comfort in different environments.

[0051] In summary, the present invention effectively eliminates the moiré interference fringe problem of the LED display screen and improves the display effect and user experience of the display screen through a series of steps such as designing irregular patterns, precision machining of metal grids, cleaning treatment, optimizing superposition effects, quality inspection and environmental adaptability testing.

[0052] A structure for eliminating moiré interference fringes on an LED display screen, the structure comprising an LED display screen and a metal grid, the metal grid covering a liquid crystal particle layer of the LED display screen, and the pattern of the metal grid matching the pixel arrangement of the liquid crystal particle layer

[0053] By covering the liquid crystal particle layer of the LED display with a metal grid, the metal grid not only has good conductivity and light transmittance, but also has a carefully designed pattern that accurately matches the pixel arrangement of the liquid crystal particle layer. This design fundamentally changes the spatial frequency relationship between the surface layer of the display and the internal pixel structure, making the spatial frequency distribution after the superposition of the two more uniform, effectively reducing the conditions for the generation of moiré interference fringes, thereby reducing the occurrence of moiré interference fringes at the source.

[0054] Secondly, the introduction of the metal grid not only helps to eliminate moiré interference fringes, but also can improve the conductivity and light transmittance of the display to a certain extent. As an additional conductive layer, the metal grid can enhance the transmission efficiency of electrical signals of the display and improve the display effect. At the same time, the light transmittance of the metal grid has been optimized to ensure that light can penetrate smoothly without causing significant light loss due to the presence of the metal grid, thereby maintaining the high brightness and color reproduction of the display.

[0055] In addition, the metal grid in the present invention is well made, and the line width and spacing are controlled with extremely high precision, ensuring perfect matching with the pixels of the LED display screen. This high-precision manufacturing process not only improves the visual effect of the display screen, but also enables the metal grid to remain stable during long-term use, and is not prone to deformation or falling off, thereby extending the service life of the display screen.

[0056] In summary, the present invention proposes a structure for eliminating moiré fringes on an LED display screen, which effectively eliminates moiré fringes by introducing a metal grid and achieving precise matching between the metal grid and the liquid crystal particle layer, thereby improving the display effect and visual comfort of the display screen. At the same time, the introduction of the metal grid also enhances the electrical conductivity and light transmittance of the display screen, ensuring the smooth penetration of light and the stable transmission of electrical signals. In addition, the high-precision manufacturing process also ensures the long-term stability and service life of the display screen. These beneficial effects together constitute the significant advantages of the present invention over the defects in the background technology.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for eliminating moiré fringes on an LED display screen, characterized in that: The following steps are involved: S10, designing an irregular pattern: according to the pixel arrangement and size of the LED display screen, designing an irregular pattern composed of multiple polygons with different shapes and angles; S20, making a metal grid; using precision machining to make the designed irregular pattern on the metal film to form a metal grid, and the material of the metal film is selected from a material with good electrical conductivity and light transmittance; S30, superimposing a metal grid; superimposing the prepared metal grid and the liquid crystal particle layer of the LED display screen, ensuring that the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer; S40, optimizing the superposition effect; optimizing the superposition effect by adjusting the superposition angle and position of the metal grid until the best effect of eliminating the moiré interference pattern is achieved.

2. The method for eliminating moiré fringes on an LED display screen according to claim 1, characterized in that: The polygon is an irregular eight-square grid, and each side length and angle is accurately calculated according to the following formula; f moire =|f1-f2| Among them, f moire represents the spatial frequency of the moiré interference fringe, f1 and f2 represent the spatial frequencies of the two layers of film, respectively. By designing an irregular octagonal pattern, the spatial frequency of the two layers of film after superposition changes, thereby reducing f moire The value of the polygon should also be adjusted so that the spatial frequency f of the moiré fringe is moire All of them can meet the preset threshold requirements.

3. The method for eliminating moiré fringes on an LED display screen according to claim 1, characterized in that: The material of the metal film is one of nano copper or nano silver, and the line width w and spacing s of the metal grid must satisfy the relationship: w / s=k×PPI, where k is the proportionality coefficient and PPI is the pixel density of the LED display screen, to ensure that the metal grid and the pixels of the LED display screen are perfectly matched. In step S20, the precision processing adopts one of photolithography technology, electron beam etching technology or laser processing technology.

4. The method for eliminating moiré fringes on an LED display screen according to claim 1, characterized in that: Before superimposing the metal grid in step S30, the metal grid needs to be cleaned to remove stains and impurities on the surface. The cleaning of the metal grid adopts ultrasonic cleaning technology to remove stains and impurities on the surface of the metal grid through high-frequency vibration while avoiding damage to the metal grid. The surface roughness Ra of the cleaned metal grid needs to be less than 0.1μm to ensure the superposition effect.

5. The method for eliminating moiré fringes on an LED display screen according to claim 1, characterized in that: In step S40, when optimizing the superposition effect, an interferometer is used to perform a moiré interference fringe test on the superimposed display screen. According to the test results, the superposition angle and position of the metal grid are fine-tuned until the contrast of the moiré interference fringe is lower than a preset threshold, so as to achieve complete elimination of the moiré interference fringe.

6. A method for eliminating moiré fringes on an LED display screen according to any one of claims 1 to 5, characterized in that: The method also includes the following steps: performing quality inspection on the LED display screen after eliminating the moiré interference fringes, ensuring that the clarity and visual comfort of the display screen meet preset standards, the quality inspection includes brightness uniformity test, color reproduction test, contrast test and viewing angle test, and the quality inspection also includes performing environmental adaptability test on the LED display screen after eliminating the moiré interference fringes, including performance test under extreme environments of high temperature, low temperature and humidity, ensuring that the display screen can maintain good clarity and visual comfort in different environments.

7. The method for eliminating moiré fringes on an LED display screen according to claim 1, characterized in that: In the step S20, when making the metal grid, the metal film needs to be pre-treated, including annealing and surface flattening, to improve the conductivity and light transmittance of the metal grid, while ensuring the accuracy of the line width and spacing of the metal grid.

8. A structure for eliminating moiré fringes on an LED display screen prepared by the method according to any one of claims 1 to 7, characterized in that: The structure comprises an LED display screen and a metal grid, wherein the metal grid covers the liquid crystal particle layer of the LED display screen, and the pattern of the metal grid matches the pixel arrangement of the liquid crystal particle layer.

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