Method for improving display unevenness after module reliability, liquid crystal module and display device

Abstract

The invention provides a method for improving display unevenness after module reliability, a liquid crystal module and a display device.The method comprises the following steps that according to the length value L of a diffusion film and the high-temperature expansion rate value t% of the diffusion film, the expansion size A of the diffusion film in an environment test is calculated, and the combined tolerance value e after the diffusion film is assembled is calculated; sequentially assembling a reflecting film, a light guide plate and a diffusion film in a rubber frame on a machine table; after the diffusion film is assembled, the gap between the outer edge of the expanded diffusion film and the rubber frame retaining wall in the environmental test is an actual mounting gap D1; d < 1gt >; d < 2-f < gt >; a; and fgt; e; d2 is a gap design value between the outer edge of the diffusion film and the retaining wall of the rubber frame; f is the tolerance of D2; d < 2-f > is the minimum requirement of the assembly gap after the diffusion film is assembled. According to the technical scheme provided by the invention, a formula is used for calculating and controlling the tolerance and the diffusion expansion rate of each material, so that the phenomenon that the display screen of the liquid crystal module is often uneven in display during an environment test is avoided.

Description

Technical Field

[0001] This application belongs to the field of liquid crystal display device technology, and more specifically, relates to a method for improving display unevenness after module reliability, a liquid crystal module, and a display device. Background Technology

[0002] With the development of LCD technology, the thickness requirements of displays using LCD modules are becoming increasingly thinner, and the screen display area is becoming larger. This leads to insufficient gap space within the backlight of the LCD module. Consequently, during temperature-related environmental tests, the expanding diffusion film lacks sufficient space to release, causing it to arch within the backlight and appear as uneven display on the LCD module screen—commonly known in the industry as film wrinkling. The usual solution is to increase the gap between the diffusion film and the frame. However, there is no reliable method to determine the appropriate increase in gap size. If the gap is too large, the distance between the diffusion film and the backlight emitting area will decrease, resulting in bright lines in the emitting area, which will also cause the test to fail and affect the project schedule. Therefore, how to reasonably quantify and control the size of the gap between the diffusion film and the frame to reduce the occurrence of uneven display during environmental testing has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this application is to provide a method for improving the uneven display after module reliability, so as to solve the above-mentioned technical problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: A method for improving display unevenness after module reliability is provided, for a liquid crystal module. The liquid crystal module includes a frame, a reflective film, a light guide plate, and a diffusion film. The assembly of the liquid crystal module is completed on a machine. The frame includes a frame barrier facing the outer edge of the diffusion film. The method for improving display unevenness after module reliability includes the following steps:

[0005] The expansion dimension A of the diffusion membrane during environmental testing is calculated based on the length L of the diffusion membrane and the high-temperature expansion rate t%.

[0006] Calculate the combined tolerance value e after the diffusion membrane is assembled;

[0007] On the machine, the reflective film, light guide plate and diffusion film are sequentially assembled into the frame;

[0008] After the diffusion membrane is assembled, the gap between the outer edge of the expanded diffusion membrane and the frame retaining wall during environmental testing is the actual installation gap D1; D1 must meet the conditions shown in the following formula:

[0009] D1>D2-f>A; and f>e;

[0010] Where D2 is the design value of the gap between the outer edge of the diffusion membrane and the frame retaining wall; f is the tolerance of D2; and D2-f is the minimum requirement for the assembly gap after the diffusion membrane is assembled.

[0011] Optionally, the step of calculating the combined tolerance value e after the diffusion film is assembled includes the following steps:

[0012] Obtain the width value W of the frame retaining wall and the tolerance of W as ±a;

[0013] Obtain the length value L of the diffusion film and the tolerance of L as ±b;

[0014] The assembly tolerance of the diffusion membrane during assembly on the machine is ±c;

[0015] The combined tolerance value e is calculated using the formula for calculating the combined tolerance value e; where e = .

[0016] Optionally, the step of calculating the expansion dimension A of the diffusion membrane during environmental testing based on the length L of the diffusion membrane and the high-temperature expansion rate t% of the diffusion membrane includes the following steps:

[0017] Obtain the length L of the diffusion membrane;

[0018] Obtain the high-temperature expansion coefficient (t%) of the diffusion film.

[0019] The expansion dimension A is calculated using the formula: A = L * t.

[0020] Optionally, the frame includes a base plate and a frame retaining wall protruding upward from the edge area of ​​the base plate; the step of sequentially assembling the reflective film, light guide plate, and diffuser film into the frame on the machine includes the following steps:

[0021] The frame is fixedly placed on the machine platform, with the base plate parallel to the table surface of the machine platform. The upper surface of the base plate facing away from the table surface of the machine platform is the assembly surface.

[0022] The reflective film is attached to the assembly surface;

[0023] The light guide plate is attached to the reflective film;

[0024] The diffusion film is attached to the light guide plate, and the gap between the outer edge of the reflective film and the frame barrier is greater than the gap between the outer edge of the diffusion film and the frame barrier; the gap between the outer edge of the light guide plate and the frame barrier is greater than the gap between the outer edge of the diffusion film and the frame barrier.

[0025] Optionally, the liquid crystal module further includes a lower brightness enhancement film, an upper brightness enhancement film, and a light-shielding film. The light-shielding film includes a transparent light-transmitting area and an opaque light-shielding area disposed around the light-transmitting area. After the diffusion film assembly step, the following steps are also included:

[0026] Attach the lower brightness enhancement film to the diffusion film;

[0027] Attach the upper brightness enhancement film to the lower brightness enhancement film;

[0028] Attach the light-shielding film to the upper brightness enhancement film; the vertical projection plane of the light-transmitting area is within the range of the vertical projection planes of the upper brightness enhancement film, the lower brightness enhancement film, the diffusion film, the light guide plate, and the reflective film; the vertical projection plane of the light-shielding area covers the outer edges of the upper brightness enhancement film, the lower brightness enhancement film, the diffusion film, the light guide plate, and the reflective film, as well as the glue frame retaining wall.

[0029] Optionally, the outer edge of the light guide plate is flush with the outer edge of the reflective film, the outer edge of the upper brightness enhancement film protrudes from the outer edge of the lower brightness enhancement film, the outer edge of the lower brightness enhancement film is flush with the outer edge of the unexpanded diffusion film, and the outer edge of the light-shielding area of the light-shielding film protrudes from the outer side of the glue frame retaining wall.

[0030] Optionally, after the step of attaching the light-shielding film to the upper brightness enhancement film, the following steps are further included:

[0031] Conduct an environmental test on the assembled liquid crystal module;

[0032] After the environmental test, conduct a brightness uniformity test on the liquid crystal module;

[0033] If no display defect appears in the diffusion film, it is judged as qualified; if a display defect appears in the diffusion film, it is judged as unqualified. The display defects include a brightness deviation exceeding a preset threshold, dark spots, bright spots, and uneven display caused by film wrinkles of the diffusion film.

[0034] This application also presents a liquid crystal module, which is made by applying the method for improving the uneven display after improving the module reliability as described above on a machine platform; the liquid crystal module includes:

[0035] A glue frame, which includes a bottom plate and a glue frame retaining wall protruding upward from the edge area of the bottom plate. The upper plate surface of the bottom plate facing away from the machine platform is the assembly surface;

[0036] A reflective film, attached to the assembly surface, and there is a gap between the outer edge of the reflective film and the glue frame retaining wall;

[0037] A light guide plate, attached to the reflective film, and there is a gap between the outer edge of the light guide plate and the glue frame retaining wall;

[0038] A diffusion film, attached to the light guide plate;

[0039] A lower brightness enhancement film, attached to the diffusion film, and there is a gap between the outer edge of the lower brightness enhancement film and the glue frame retaining wall;

[0040] ​

[0041] The light-blocking film is attached to the upper light-enhancing film;

[0042] In the environmental test, the gap between the outer edge of the expanded diffusion membrane and the frame retaining wall is the actual installation gap D1, which must meet the conditions shown in the following formula:

[0043] D1>D2-f>A; and f>e;

[0044] Where D2 is the design value of the gap between the outer edge of the diffusion membrane and the frame retaining wall; f is the tolerance of D2; D2-f is the minimum requirement for the assembly gap after the diffusion membrane is assembled; A is the expansion dimension of the diffusion membrane during environmental testing; and e is the combined tolerance value of the assembled diffusion membrane.

[0045] 9. The liquid crystal module as claimed in claim 8, wherein the expansion dimension A must satisfy the condition shown in the following formula:

[0046] A = L*t%,

[0047] Where L is the length of the diffusion film, and t% is the high-temperature expansion rate of the diffusion film;

[0048] The combined tolerance value e must satisfy the conditions shown in the following formula:

[0049] e= ,

[0050] Where a is the tolerance of the width W of the frame retaining wall; b is the tolerance of the length L of the diffusion membrane; and c is the assembly tolerance of the diffusion membrane when it is assembled on the machine.

[0051] This application also proposes a display device comprising the liquid crystal module as described above.

[0052] The beneficial effect of the method for improving module reliability and addressing uneven display provided in this application is that, in environmental testing, the gap between the outer edge of the expanded diffusion film and the frame retainer is the actual installation gap D1. D1 must satisfy the conditions D1>D2-f>A and f>e. In the backlight design of the LCD module, D2, f, and L are known and determined. Therefore, it is only necessary to control the incoming material of the diffusion film to ensure its expansion rate does not exceed t%. Once the expansion rate t% of the diffusion film is well controlled, the minimum assembly gap requirement D2-f of the diffusion film will be determined. Thus, if the backlight of the LCD module is shipped with a D1 value greater than D2-f, problems such as uneven display caused by the expansion and arching of the diffusion film during environmental testing will not occur. In other words, in the technical solution of this application, the expansion rate control range of the diffusion film and the minimum gap control range between the diffusion film and the frame can be calculated by using the formula designed based on the tolerances of each material and the expansion rate of the diffusion film. This simultaneous consideration of the expansion rate of the diffusion film and the precise quantitative control of the gap size between the diffusion film and the frame can effectively solve the problem of uneven display caused by the diffusion film expansion not being released during the environmental test of the LCD module. This will help to shorten the project verification cycle, pass customer verification in advance, reduce verification costs, reduce production costs, and improve the cost performance and production efficiency of the product. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A flowchart illustrating a method for improving module reliability and displaying unevenness according to an embodiment of this application;

[0055] Figure 2 An exploded view of the liquid crystal module provided in the embodiments of this application;

[0056] Figure 3 This is a partial structural side view of the liquid crystal module provided in an embodiment of this application.

[0057] Explanation of icon numbers:

[0058] label name label name 100 Frame 110 base plate 120 Framed retaining wall 200 reflective film 300 Light guide plate 400 diffusion membrane 500 Lower brightness enhancement film 600 Brightening film 700 shading film 800 FPC and LED Components 900 double-sided tape 710 Translucent area 720 Shaded area Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0060] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0061] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this application are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0062] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0066] This application provides a method for improving display unevenness after module reliability and a liquid crystal module.

[0067] Please see Figures 1 to 3 In one embodiment, the method for improving module reliability and addressing uneven display is used in a liquid crystal module. The liquid crystal module is assembled on a machine. Specifically, the liquid crystal module includes a frame 100, a reflective film 200, a light guide plate 300, a diffuser film 400, a lower brightness enhancement film 500, an upper brightness enhancement film 600, and a light-shielding film 700. Specifically, the frame 100 includes a base plate 110 and a frame retainer 120 protruding upwards from the edge region of the base plate 110. The upper surface of the base plate 110 facing away from the machine is the mounting surface. The reflective film 200 is attached to the mounting surface, and there is a gap between the outer edge of the reflective film 200 and the frame retainer 120. The light guide plate 300 is attached to the reflective film 200, and there is a gap between the outer edge of the light guide plate 300 and the frame retainer 120. The diffuser film 400 is attached to the light guide plate 300. The lower brightness enhancement film 500 is attached to the diffusion film 400, and there is a gap between the outer edge of the lower brightness enhancement film 500 and the frame barrier 120. The upper brightness enhancement film 600 is attached to the lower brightness enhancement film 500, and there is a gap between the outer edge of the upper brightness enhancement film 600 and the frame barrier 120. The light-shielding film 700 is attached to the upper brightness enhancement film 600.

[0068] Accordingly, the method for improving module reliability and displaying unevenness includes the following steps:

[0069] S1. Calculate the expansion dimension A of the diffusion membrane 400 during the environmental test based on the length L of the diffusion membrane 400 and the high-temperature expansion rate t% of the diffusion membrane 400.

[0070] S2. Calculate the combined tolerance value e after the diffusion membrane 400 is assembled;

[0071] S3. On the machine, the reflective film 200, the light guide plate 300 and the diffusion film 400 are sequentially assembled into the frame 100.

[0072] S4. After the diffusion membrane 400 is assembled, the gap between the outer edge of the expanded diffusion membrane 400 and the frame retaining wall 120 in the environmental test is the actual installation gap D1; D1 must meet the conditions shown in the following formula:

[0073] D1>D2-f>A; and f>e;

[0074] Wherein, D2 is the design value of the gap between the outer edge of the diffusion membrane 400 and the frame retaining wall 120; f is the tolerance of D2; and D2-f is the minimum requirement for the assembly gap after the diffusion membrane 400 is assembled.

[0075] Here, the steps to calculate the combined tolerance value e after the diffusion film 400 is assembled include the following steps:

[0076] Obtain the width value W of the 120mm thick frame retaining wall and the tolerance of W as ±a;

[0077] Obtain the length value L of the diffusion film 400 and the tolerance of L as ±b;

[0078] The assembly tolerance for the diffusion membrane 400 when it is assembled on the machine is ±c;

[0079] The combined tolerance value e is calculated using the formula for calculating the combined tolerance value e; where e = .

[0080] It is understandable that in the LCD module, the materials related to the diffusion film 400 include not only the diffusion film 400 itself, but also the frame retainer 120 and the machine assembly. Therefore, the assembly tolerance value e can be determined by the tolerance of the frame retainer 120, the length tolerance of the diffusion film 400, and the assembly tolerance of the diffusion film 400 when it is assembled on the machine. Moreover, the tolerance f of the gap design value of diffusion to the frame retainer should be greater than e to ensure that the diffusion film 400 will not arch inside after high temperature expansion, thus avoiding problems such as uneven display due to film wrinkles.

[0081] Furthermore, the steps for calculating the expansion dimension A of the diffusion membrane 400 during environmental testing, based on the length value L of the diffusion membrane and the high-temperature expansion rate t% of the diffusion membrane 400, include the following steps:

[0082] Obtain the length value L of the diffusion membrane 400;

[0083] Obtain the high-temperature expansion rate (t%) of the diffusion film 400.

[0084] The expansion dimension A is calculated using the formula: A = L * t.

[0085] It is understandable that since the material of the diffusion membrane 400 is fixed when it is received, and the high temperature value in the environmental test is also fixed according to the experimental standard, the high temperature expansion rate t% of the diffusion membrane 400 is also fixed, and the expansion size of the diffusion membrane 400 in the environmental test can be calculated accordingly.

[0086] Based on this design, in this embodiment, the gap between the outer edge of the expanded diffusion film 400 and the frame retainer 120 during environmental testing is the actual installation gap D1. D1 must satisfy the conditions D1>D2-f>A and f>e. In the backlight design of the LCD module, D2, f, and L are known and determined. Therefore, it is only necessary to control the incoming material of the diffusion film 400 to ensure its expansion rate does not exceed t%. Once the expansion rate t% of the diffusion film 400 is controlled, the minimum assembly gap requirement D2-f of the diffusion film 400 will be determined. Thus, if the backlight of the LCD module is shipped with a D1 value greater than D2-f, problems such as uneven display caused by the expansion and arching of the diffusion film 400 during environmental testing will not occur. In other words, in the technical solution of this application, the expansion rate control range of the diffusion film 400 and the minimum gap control range between the diffusion film 400 and the frame retainer 120 can be calculated using a formula designed based on the tolerances of each material and the expansion rate of the diffusion film 400. This simultaneous consideration of the expansion rate of the diffusion film 400 and the precise quantitative control of the gap size between the diffusion film 400 and the frame retainer 120 can effectively solve the problem of uneven display caused by the diffusion film 400 not being released during environmental testing of the LCD module. This is beneficial for shortening the project verification cycle, passing customer verification earlier, reducing verification costs, lowering production costs, and improving the cost-effectiveness and production efficiency of the product. Moreover, the design solution of this application is a method of calculating and controlling the tolerances of each material and the expansion rate of the diffusion film 400 using formulas, which is not limited by personnel, equipment, or cost and can be implemented on a large scale.

[0087] It should be noted here that, as Figure 2 As shown, the LCD module also includes FPC (Flexible Printed Circuit), LED components, and double-sided adhesive 900. The frame 100 is located at the bottom and serves as the product's framework for support. The reflective film 200 primarily reflects light emitted from the light source, while the light guide plate 300 guides light. The FPC and LED components 800 provide the light source, and the double-sided adhesive 900 is used to bond and fix the FPC and LED components 800. The diffuser film 400 primarily softens light and conceals imperfections. The lower brightness enhancement film 500 enhances brightness vertically, while the upper brightness enhancement film 600 enhances brightness horizontally. The light-shielding film 700 shields the edges of the LCD module and adheres to the frame 100. Furthermore, in... Figure 3 The image shows the structure of the LCD module at the rear of the backlight, that is, on the side opposite the FPC and the LED assembly 800.

[0088] Furthermore, such as Figure 2 and Figure 3As shown, the steps of sequentially assembling the reflective film 200, the light guide plate 300, and the diffuser film 400 within the frame 100 on the machine include the following steps:

[0089] First, fix the frame 100 on the machine tool, with the base plate 110 parallel to the machine tool surface. The upper surface of the base plate 110 facing away from the machine tool surface is the assembly surface. Then, attach the reflective film 200 to the assembly surface. Next, attach the light guide plate 300 to the reflective film 200. Finally, attach the diffuser film 400 to the light guide plate 300. After the diffuser film 400 is assembled, as follows... Figure 3 As shown, the gap between the outer edge of the reflective film 200 and the frame barrier 120 is larger than the gap between the outer edge of the diffuser film 400 and the frame barrier 120; the gap between the outer edge of the light guide plate 300 and the frame barrier 120 is larger than the gap between the outer edge of the diffuser film 400 and the frame barrier 120. In other words, the outer edge of the diffuser film 400 protrudes beyond the reflective film 200 and the light guide film, thus completely shielding the edge defects of the light guide plate 300 and the reflective film 200, thereby ensuring the uniformity of light at the edge of the display area; at the same time, the larger diffuser film 400 can also expand the effective diffusion area, reduce light loss at the edge of the light guide plate 300, and prevent brightness attenuation or color difference.

[0090] Further, the light-shielding film 700 includes a transparent light-transmitting area 710 and an opaque light-shielding area 720 disposed around the light-transmitting area 710. Following the assembly of the diffusion film 400, the following steps are also included: First, attach the lower brightness enhancement film 500 to the diffusion film 400; then, attach the upper brightness enhancement film 600 to the lower brightness enhancement film 500. Then, attach the light-shielding film 700 to the upper brightness enhancement film 600; the vertical projection surface of the light-transmitting area 710 is within the range of the vertical projection surfaces of the upper brightness enhancement film 600, the lower brightness enhancement film 500, the diffusion film 400, the light guide plate 300, and the reflective film 200; the vertical projection surface of the light-shielding area 720 covers the outer edges of the upper brightness enhancement film 600, the lower brightness enhancement film 500, the diffusion film 400, the light guide plate 300, and the reflective film 200, as well as the frame barrier 120. In this way, the light-blocking area 720 of the light-blocking film 700 can completely cover the outer edges of each component below it and the gap between each component and the frame barrier 120, so that there will be no light leakage problem at the edge of the display screen.

[0091] Furthermore, such as Figure 3As shown, the outer edge of the light guide plate 300 is flush with the outer edge of the reflective film 200. The outer edge of the upper brightness enhancement film 600 protrudes from the outer edge of the lower brightness enhancement film 500. The outer edge of the lower brightness enhancement film 500 is flush with the outer edge of the unexpanded diffusion film 400. The outer edge of the light shielding area 720 of the light shielding film 700 protrudes from the outer side of the glue frame retaining wall 120. In this way, the display effect of the liquid crystal module can be further improved, and the top surface of the glue frame retaining wall 120 can be completely covered, making the adhesion between the light shielding film 700 and the glue frame retaining wall 120 more stable and having better light shielding performance.

[0092] Further, after the step of attaching the light shielding film 700 to the upper brightness enhancement film 600, the following steps are further included:

[0093] Perform an environmental test on the assembled liquid crystal module and conduct a brightness uniformity test;

[0094] If no display defect occurs in the diffusion film 400, it is determined to be qualified; if a display defect occurs in the diffusion film 400, it is determined to be unqualified. The display defects include a brightness deviation exceeding a preset threshold, dark spots, bright spots, and uneven display caused by film wrinkles of the diffusion film 400.

[0095] It can be understood that an environmental test is also required for the assembled liquid crystal module. In a high-temperature environment, the diffusion film 400 will expand. At this time, by conducting a brightness uniformity test on the liquid crystal module including the expanded diffusion film 400, it can be checked whether the liquid crystal module manufactured by the method for improving the display unevenness after improving the module reliability can achieve the expected improvement effect. If a display defect occurs, manual re-inspection and confirmation are required, and then the liquid crystal module is disassembled for further analysis of the reasons, such as but not limited to whether there are assembly mistakes, etc., so as to further ensure the product quality.

[0096] This application also proposes a display device, which includes the liquid crystal module manufactured by the method for improving the display unevenness after improving the module reliability as described above. The specific structure of this liquid crystal module refers to the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0097] The above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method for improving display unevenness after module reliability, used in a liquid crystal module, the liquid crystal module comprising a frame, a reflective film, a light guide plate, and a diffusion film; the assembly of the liquid crystal module is completed on a machine, the frame comprising a frame retainer facing the outer edge of the diffusion film, characterized in that, The method for improving module reliability and displaying unevenness includes the following steps: The expansion dimension A of the diffusion membrane during environmental testing is calculated based on the length L of the diffusion membrane and the high-temperature expansion rate t% of the diffusion membrane. Calculate the combined tolerance value e after the diffusion membrane is assembled; The reflective film, the light guide plate, and the diffusion film are sequentially assembled in the frame on the machine base; After the diffusion membrane is assembled, the gap between the outer edge of the expanded diffusion membrane and the frame retaining wall during the environmental test is the actual installation gap D1; D1 must meet the conditions shown in the following formula: D1>D2-f>A; and f>e; ± Wherein, D2 is the design value of the gap between the outer edge of the diffusion membrane and the adhesive frame retaining wall; f is the tolerance of D2; and D2-f is the minimum requirement for the assembly gap after the diffusion membrane is assembled.

2. The method for improving module reliability and displaying unevenness as described in claim 1, characterized in that, The step of calculating the combined tolerance value e after the diffusion film is assembled includes the following steps: Obtain the width value W of the frame retaining wall and the tolerance of W as ±a; The length value L of the diffusion film and the tolerance of L are obtained as ±b; The assembly tolerance of the diffusion film during assembly on the machine is ±c; The combined tolerance value e is calculated according to the formula for calculating the combined tolerance value e; where e = .

3. The method for improving module reliability and displaying unevenness as described in claim 1, characterized in that, The step of calculating the expansion dimension A of the diffusion membrane during environmental testing based on the length value L of the diffusion membrane and the high-temperature expansion rate t% of the diffusion membrane includes the following steps: Obtain the length value L of the diffusion film; The high-temperature expansion rate (t%) of the diffusion film was obtained. The expansion dimension A is calculated according to the formula for calculating the expansion dimension A; where A = L*t%.

4. The method for improving module reliability and displaying unevenness as described in claim 1, characterized in that, The frame includes a base plate and a frame retaining wall protruding upward from the edge region of the base plate; the step of sequentially assembling the reflective film, the light guide plate, and the diffusion film within the frame on the machine includes the following steps: The frame is fixedly placed on the machine platform, the base plate is parallel to the table surface of the machine platform, and the upper surface of the base plate facing away from the table surface of the machine platform is the assembly surface; The reflective film is attached to the assembly surface; The light guide plate is attached to the reflective film; The diffusion film is attached to the light guide plate, and the gap between the outer edge of the reflective film and the frame barrier is greater than the gap between the outer edge of the diffusion film and the frame barrier; the gap between the outer edge of the light guide plate and the frame barrier is greater than the gap between the outer edge of the diffusion film and the frame barrier.

5. The method for improving module reliability and displaying unevenness as described in claim 4, characterized in that, The liquid crystal module further includes a lower brightness enhancement film, an upper brightness enhancement film, and a light-shielding film. The light-shielding film includes a transparent light-transmitting area and an opaque light-shielding area disposed around the light-transmitting area. Following the step of assembling the diffusion film, the module further includes the following steps: The lower brightness enhancement film is attached to the diffusion film; The upper brightness enhancement film is attached to the lower brightness enhancement film; Attach the light-shielding film to the upper brightness enhancement film; the vertical projection plane of the light-transmitting area is within the range of the vertical projection planes of the upper brightness enhancement film, the lower brightness enhancement film, the diffusion film, the light guide plate, and the reflection film; the vertical projection plane of the light-shielding area covers the outer edges of the upper brightness enhancement film, the lower brightness enhancement film, the diffusion film, the light guide plate, and the reflection film, as well as the glue frame retaining wall.

6. The method for improving module reliability and displaying unevenness as described in claim 5, characterized in that, The outer edge of the light guide plate is flush with the outer edge of the reflection film, the outer edge of the upper brightness enhancement film protrudes from the outer edge of the lower brightness enhancement film, the outer edge of the lower brightness enhancement film is flush with the outer edge of the unexpanded diffusion film, and the outer edge of the light-shielding area of the light-shielding film protrudes from the outer side of the glue frame retaining wall.

7. The method for improving module reliability and displaying unevenness as described in claim 1, characterized in that, After the step of attaching the light-shielding film to the upper brightness enhancement film, the following steps are further included: Perform the environmental test on the assembled liquid crystal module and conduct a brightness uniformity test. If no display defect occurs in the diffusion film, it is judged as qualified; if a display defect occurs in the diffusion film, it is judged as unqualified. The display defects include a brightness deviation exceeding a preset threshold, dark spots, bright spots, and uneven display caused by film wrinkles of the diffusion film.

8. A liquid crystal module, characterized in that, The liquid crystal module is made on a machine table by using the method for improving the display non-uniformity of the module reliability according to any one of claims 1 to 7; the liquid crystal module includes: A glue frame, the glue frame includes a bottom plate and a glue frame retaining wall protruding upward from the edge area of the bottom plate, and the upper plate surface of the bottom plate facing away from the machine table is an assembly surface; A reflection film, attached to the assembly surface, and there is a gap between the outer edge of the reflection film and the glue frame retaining wall; A light guide plate, attached to the reflection film, and there is a gap between the outer edge of the light guide plate and the glue frame retaining wall; A diffusion film, attached to the light guide plate; A lower brightness enhancement film, attached to the diffusion film, and there is a gap between the outer edge of the lower brightness enhancement film and the glue frame retaining wall; An upper brightness enhancement film, attached to the lower brightness enhancement film, and there is a gap between the outer edge of the upper brightness enhancement film and the glue frame retaining wall; A light-shielding film, attached to the upper brightness enhancement film; Wherein, the gap between the outer edge of the diffusion film after expansion in the environmental test and the glue frame retaining wall is the actual installation gap D1, and D1 needs to meet the conditions shown in the following formula: D1 > D2 - f > A; and f > e; Wherein, D2 is the design value of the gap between the outer edge of the diffusion film and the glue frame retaining wall; f is the tolerance of D2; D2 - f is the minimum requirement of the assembly gap after the diffusion film is assembled; A is the expansion size of the diffusion film during the environmental test; e is the combined tolerance value of the diffusion film after assembly.

9. The liquid crystal module as described in claim 8, characterized in that, The expansion size A needs to meet the conditions shown in the following formula: A = L * t%, Wherein, L is the length value of the diffusion film, and t% is the high-temperature expansion rate value of the diffusion film; The combined tolerance value e needs to meet the conditions shown in the following formula: e= ， Wherein, a is the tolerance of the width value W of the glue frame retaining wall; b is the tolerance of the length value L of the diffusion film; c is the assembly tolerance when the diffusion film is assembled on the machine table.

10. A display device, characterized in that, Includes the liquid crystal module as described in claim 8 or 9.

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