Method and device for analyzing and processing display abnormity of liquid crystal display screen

Abstract

The invention discloses a method and a device for analyzing and processing display abnormity of a liquid crystal display screen. The liquid crystal display screen display abnormity analysis processing method comprises the steps of determining whether a polarizer to be detected in a liquid crystal display screen is abnormal or not when it is determined that display of the liquid crystal display screen is abnormal; if yes, analyzing the abnormal polaroid to be detected to obtain an analysis result; setting a test scene according to the analysis result, and placing at least one polaroid to be used in the test scene for a verification test; and after the verification test is completed, according to an analysis result, a test result of the to-be-used polaroid and a test scene, determining an actual reason for abnormity of the to-be-tested polaroid. The invention provides a method and a device for analyzing and processing display abnormity of a liquid crystal display screen, which can determine the actual reason of the display abnormity of the liquid crystal display screen and is beneficial to improving the yield of the liquid crystal display screen.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a method and device for analyzing and processing abnormal display of a liquid crystal display screen. Background Art

[0002] With the development of science and technology, mobile phones, televisions, etc. are gradually developing towards lighter, thinner and larger directions, which also requires the use of liquid crystal display (LCD) screens to gradually change towards thinning, lightweight and reliability. The LCD screen includes a liquid crystal box, an upper polarizer and a lower polarizer. The lower polarizer is used to convert the light beam generated by the backlight source into polarized light, and the upper polarizer is used to analyze the polarized light after liquid crystal electrical modulation to produce light and dark contrast, thereby producing a display image. The imaging of the liquid crystal display module must rely on polarized light. Therefore, the polarizer is crucial to the imaging of the LCD screen.

[0003] The main structures of the upper polarizer and the lower polarizer include a polyvinyl alcohol (PVA) layer, two cellulose acetate (TAC) layers and a pressure-sensitive adhesive layer. The cellulose acetate layer is mainly used to isolate water vapor and air, and the pressure-sensitive adhesive layer serves to bond the liquid crystal box and the polarizer together. The core film material that plays a polarizing role in the polarizer is the PVA film. After dyeing, the PVA film adsorbs iodine molecules with bidirectional absorption function. Through stretching, the iodine molecules are arranged in order on the PVA film to form a polarizing film with uniform bidirectional absorption performance, and its transmission axis is perpendicular to the stretching direction.

[0004] At present, there are few studies on LCD screen abnormalities caused by polarizer abnormalities at home and abroad. Due to the limitations of insufficient technical capabilities and other issues, it is found that the solution to LCD screen abnormalities is mainly to directly replace the polarizer, but this method has limitations. It is difficult to find the real reason why the polarizer causes LCD screen abnormalities. At the same time, the failure cause is not perfect. At present, there is no systematic and effective analysis method for the situation where polarizer abnormalities cause LCD screen abnormalities, and it is even more impossible to make directional improvements based on the causes. Therefore, effective analysis of LCD screen abnormalities caused by polarizer abnormalities is a problem that needs to be solved. Summary of the invention

[0005] The present invention provides a method and device for analyzing and processing abnormal display of a liquid crystal display screen, which can determine the actual cause of the abnormal display of the liquid crystal display screen, and is beneficial to improving the yield rate of the liquid crystal display screen.

[0006] According to one aspect of the present invention, a method for analyzing and processing display abnormalities of a liquid crystal display screen is provided, wherein the liquid crystal display screen comprises a liquid crystal cell and two layers of polarizers to be tested;

[0007] The liquid crystal display screen display abnormality analysis and processing method comprises:

[0008] When it is determined that the liquid crystal display screen has abnormal display, determine whether the polarizer to be tested in the liquid crystal display screen is abnormal;

[0009] If so, analyze the abnormal polarizer to be tested to obtain an analysis result;

[0010] Set up a test scenario according to the analysis result, and place at least one polarizer to be used in the test scenario for verification test;

[0011] After the verification test is completed, determine the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test result of the polarizer to be used, and the test scenario.

[0012] Optionally, the analysis result includes a first result and a second result;

[0013] The step of analyzing the abnormal polarizer to be tested to obtain an analysis result includes:

[0014] Slice the abnormal polarizer to be tested and determine the thickness change and element change of each film layer in the polarizer to be tested after slicing, to obtain the first result;

[0015] Place the abnormal polarizer to be tested in a set solvent and soak it for a first set time period, and strip the soaked polarizer to be tested to obtain multiple film layers;

[0016] Determine the film layer that causes the abnormality of the polarizer to be tested;

[0017] Analyze the composition of the film layer that causes the abnormality of the polarizer to be tested, to obtain the second result.

[0018] Optionally, the set solvent includes ultrapure water; the first set time period includes 5 s to 10 s.

[0019] Optionally, the step of determining the film layer that causes the abnormality of the polarizer to be tested includes:

[0020] Overlap each of the stripped film layers with the polarizer to be used and place them on the light-emitting side of the backlight source. If the first polarizer group formed by overlapping the current film layer with the polarizer to be used shows a red phenomenon under the backlight source, determine that the current film layer is the film layer that causes the abnormality of the polarizer to be tested.

[0021] Optionally, the step of analyzing the composition of the film layer that causes the abnormality of the polarizer to be tested to obtain the second result includes:

[0022] Detect at least one of the material change, thermal decomposition characteristic temperature change, weight loss mass change, phase transition temperature change, volatile component change, and set ion characteristic peak intensity ratio change of the film layer that causes the abnormality of the to-be-tested polarizer, and obtain the second result.

[0023] Optionally, detecting the change in volatile components of the film layer that causes the abnormality of the to-be-tested polarizer includes:

[0024] Place the film layer that causes the abnormality of the to-be-tested polarizer in a glass container and bake it at a set temperature for a second set duration to detect the change in volatile components of the film layer that causes the abnormality of the to-be-tested polarizer.

[0025] Optionally, determining whether the to-be-tested polarizer in the liquid crystal display is abnormal includes:

[0026] Peel off both layers of the to-be-tested polarizer from the liquid crystal display;

[0027] Determine the corresponding set polarizer according to the position of the peeled to-be-tested polarizer in the liquid crystal display;

[0028] Overlap the peeled to-be-tested polarizer with its corresponding set polarizer to form a second polarizer group and place it on the light-emitting side of the backlight source, and detect whether the second polarizer group turns red.

[0029] Optionally, after determining the actual cause of the abnormality of the to-be-tested polarizer according to the analysis result, the test results of each to-be-used polarizer, and each test scenario, it further includes:

[0030] Process the abnormal to-be-tested polarizer according to the actual cause to make it return to normal, or improve the to-be-used polarizer according to the actual cause.

[0031] Optionally, determining that the liquid crystal display shows an abnormality includes determining that the liquid crystal display shows redness.

[0032] According to another aspect of the present invention, there is provided an analysis and processing device for abnormal display of a liquid crystal display. The liquid crystal display includes a liquid crystal cell and two layers of to-be-tested polarizers; the analysis and processing device for abnormal display of the liquid crystal display includes a first determination module, an analysis module, a test module, and a second determination module;

[0033] The first determination module is used to determine whether the to-be-tested polarizer in the liquid crystal display is abnormal when it is determined that the liquid crystal display shows an abnormality;

[0034] The analysis module is used to analyze the abnormal to-be-tested polarizer to obtain an analysis result;

[0035] The test module is used to set a test scenario according to the analysis result, and place at least one polarizer to be used in the test scenario for verification test;

[0036] The second determination module is used to determine the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test result of the polarizer to be used, and the test scenario after the verification test is completed.

[0037] An embodiment of the present invention provides a method for analyzing and processing abnormal display of a liquid crystal display screen. When the liquid crystal display screen has an abnormal display, it is determined whether the polarizer to be tested in the liquid crystal display screen is abnormal. When it is determined that the polarizer to be tested is abnormal, an analysis is performed on the abnormal polarizer to be tested to obtain an analysis result. Since the cause of the abnormality of the polarizer to be tested can be initially determined according to the analysis result, in this embodiment, a test scenario is set according to the analysis result, and at least one polarizer to be used is placed in the test scenario to reproduce the failure, so as to further determine the actual cause of the abnormality of the polarizer to be tested. After determining the actual cause of the abnormality of the polarizer to be tested, the unused polarizer can be improved according to the actual cause, the yield of the unused polarizer can be improved, so as to improve the problem that the polarizer is prone to abnormality, and further improve the yield of the liquid crystal display screen. In summary, the embodiment of the present invention provides a method for analyzing and processing abnormal display of a liquid crystal display screen, which can determine the actual cause of the abnormal display of the liquid crystal display screen, and is beneficial to improving the yield of the liquid crystal display screen.

[0038] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 is a schematic flowchart of a method for analyzing and processing abnormal display of a liquid crystal display screen according to an embodiment of the present invention;

[0041] Figure 2 is a schematic flowchart of another method for analyzing and processing abnormal display of a liquid crystal display screen according to an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of the thickness of each film layer after slicing a polarizer to be used provided by an embodiment of the present invention;

[0043] Figure 4 It is a schematic structural diagram of a polyvinyl alcohol layer peeled off after the polarizer to be measured is immersed in ultrapure water for a first set time period;

[0044] Figure 5 It is a schematic diagram after detecting the polyvinyl alcohol layer that causes the abnormality of the polarizer to be measured by using a Raman spectrometer according to an embodiment of the present invention;

[0045] Figure 6 It is a display situation diagram in which a second polarizer group formed after overlapping the polarizer to be measured and a set polarizer is placed on the light-emitting side of a backlight;

[0046] Figure 7 It is a display situation diagram in which a normal polarizer and a normal polarizer are overlapped and placed on the light-emitting side of a backlight according to an embodiment of the present invention;

[0047] Figure 8 It is a schematic structural diagram of an analysis and processing device for abnormal display of a liquid crystal display screen according to an embodiment of the present invention. Detailed implementation manners

[0048] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] The method for analyzing and processing abnormal display of a liquid crystal display screen provided in this embodiment can determine the structural layer and environmental factors that cause the abnormal display of the liquid crystal display screen when the liquid crystal display screen shows an abnormality.

[0051] The liquid crystal display applicable to the abnormal analysis and processing method provided in this embodiment includes a liquid crystal cell and two polarizers to be measured. The liquid crystal cell includes a first side and a second side arranged opposite to each other, and a polarizer to be measured is arranged on each of the first side and the second side of the liquid crystal cell. One of the two polarizers to be measured is an upper polarizer, and the other is a lower polarizer.

[0052] Figure 1 It is a schematic flowchart of a method for analyzing and processing display abnormalities of a liquid crystal display provided according to an embodiment of the present invention. Refer to Figure 1 , the method for analyzing and processing display abnormalities of the liquid crystal display provided in this embodiment includes the following steps:

[0053] S110. Place the liquid crystal display on the light-emitting side of the backlight.

[0054] Specifically, before detecting whether the liquid crystal display has display abnormalities, first place the liquid crystal display on the light-emitting side of the backlight so that the liquid crystal display can display a picture, and it can be determined whether the liquid crystal display has display abnormalities according to the display picture condition of the liquid crystal display.

[0055] S120. When it is determined that the liquid crystal display has display abnormalities, determine whether the polarizer to be measured in the liquid crystal display is abnormal.

[0056] Specifically, when the liquid crystal display is displaying a picture, the liquid crystal display is detected. If it is detected that the liquid crystal display is locally red, it is determined that the liquid crystal display has display abnormalities. In order to further determine the reason for the display abnormalities of the liquid crystal display, the polarizer to be measured in the liquid crystal display is detected to determine whether the polarizer to be measured is abnormal, so as to determine whether the display abnormalities of the liquid crystal display are caused by the abnormality of the polarizer to be measured.

[0057] Detecting whether the polarizer to be measured is abnormal can be to analyze the composition of the polarizer to be measured to determine whether the polarizer to be measured is abnormal, or the polarizer to be measured and the polarizer to be used can be overlapped and placed on the light-emitting side of the backlight to detect the surface condition of the polarizer to be measured, so as to determine whether the polarizer to be measured is abnormal.

[0058] If not, then execute step S130.

[0059] If so, then execute step S140.

[0060] S130. Determine that the liquid crystal cell is abnormal.

[0061] Specifically, when it is detected that both of the two polarizers to be measured in the liquid crystal display are normal, it can be determined that the reason for the display abnormalities of the liquid crystal display is caused by the abnormality of the liquid crystal cell, and the abnormal liquid crystal cell can be analyzed to find out the actual reason for the display abnormalities of the liquid crystal display.

[0062] S140. Analyze the abnormal polarizer under test to obtain an analysis result.

[0063] Specifically, if the polarizer under test is detected as abnormal, it indicates that the reason for the abnormal display of the liquid crystal display screen is caused by the abnormal polarizer under test.

[0064] If one of the two polarizers under test in the liquid crystal display screen is detected as abnormal, directly analyze the abnormal polarizer under test. If both polarizers under test are detected as abnormal, the analysis result can be obtained by analyzing one of the abnormal polarizers under test, or the analysis result can be obtained by analyzing both abnormal polarizers under test.

[0065] To further understand the reason for the abnormal display of the liquid crystal display screen, in this embodiment, the abnormal polarizer under test is analyzed. The specific analysis content can be: slicing the abnormal polarizer under test and detecting the thickness change and / or the change of material elements in each film layer of the polarizer under test after slicing. It is also possible to analyze the change of material elements, volatile components, etc. in each film layer of the abnormal polarizer under test to obtain an analysis result.

[0066] S150. Set up a test scenario according to the analysis result, and place at least one polarizer to be used in the test scenario for a verification test.

[0067] Specifically, the polarizer to be used refers to a polarizer that has not been used, and the polarizer to be used can be a product produced in the same batch as the polarizer to be detected.

[0068] According to the analysis result, the reason for the abnormality of the polarizer under test can be determined. Exemplarily, if the analysis result includes that the content of iodine penta-anion (I 5- ) in the polarizer under test is low, it can be determined that the reason for the abnormality of the polarizer under test is caused by moisture infiltration into the polarizer under test. If the analysis result includes degradation and aging cross-linking phenomena, it can be determined that the reason for the abnormality of the polarizer under test is caused by high temperature. If the analysis result includes new elements, it can be determined that the reason for the abnormality of the polarizer under test is caused by the invasion of new elements.

[0069] After determining the cause of the abnormality of the polarizer under test based on the analysis results, in order to further verify the accuracy of the determined cause, a test scenario can be set according to the determined cause. Exemplarily, when it is determined based on the analysis results that the cause of the abnormality of the polarizer under test is moisture infiltration into the polarizer under test, the test environment set can be a high-humidity environment, and the polarizer to be used is placed in the test environment to further verify whether the abnormality of the polarizer under test is caused by humidity. The high-humidity environment includes a relative humidity of 10% RH to 100% RH. When it is determined based on the analysis results that the cause of the abnormality of the polarizer under test is the invasion of new elements, the test environment that can be set is a specific solvent, and the polarizer under test is immersed in the specific solvent to observe whether new elements invade the polarizer to be used. The type of the specific solvent can be specifically determined according to the types of new elements in the analysis results. Exemplarily, the specific solvent can be an organic solvent such as a cleaning agent, an ether, or an alcohol. When it is determined based on the analysis results that the cause of the abnormality of the polarizer under test is high temperature, the test environment set can be a high-temperature environment, and the polarizer to be used is placed in the test environment to further verify whether the abnormality of the polarizer under test is caused by high temperature. The high-temperature environment can be 30°C to 150°C.

[0070] S160. After the verification test is completed, determine the actual cause of the abnormality of the polarizer under test based on the analysis results, the test results of the polarizer to be used, and the test scenario.

[0071] Specifically, the actual cause of the abnormality of the polarizer under test is also the cause of the abnormal display of the liquid crystal display screen. The polarizer to be used is placed in the test scenario for testing to verify whether the polarizer to be used can fail and reproduce in the test scenario. The test results of the polarizer to be used include that the polarizer to be used is abnormal or the polarizer to be used is not abnormal. If the polarizer to be used turns red under the backlight after the test in the test scenario is completed, it can be confirmed that the polarizer to be used is abnormal, and the actual cause of the abnormality of the polarizer under test can be further confirmed. The analysis results can represent the initially determined abnormal cause of the abnormality of the polarizer under test. According to the test environment and test results, it can be further verified whether the initially determined abnormal cause is correct. Exemplarily, if the analysis results include that the iodine content in the elements of the polarizer under test is low, it can be initially determined that the cause of the abnormality of the polarizer under test is moisture infiltration into the polarizer under test. In setting the test scenario, a test scenario with a higher humidity is set, and the polarizer to be used is placed in the test scenario with a high humidity. If the polarizer to be used is abnormal after the test is completed, it means that the abnormality of the polarizer under test is indeed caused by moisture infiltration, and the actual cause of the abnormality of the polarizer under test can be finally determined to be moisture infiltration into the polarizer under test.

[0072] After determining the actual cause of the abnormality of the polarizer under test, the method of manufacturing the polarizer under test can be improved according to the actual cause, so as to improve the yield of the polarizer under test when manufacturing a new polarizer under test in the future, thereby improving the yield of the liquid crystal display screen. It is also possible to reinforce and repair the polarizer that has been manufactured but not yet used to ensure the yield of the polarizer that has not yet been used. It is also possible to process the abnormal polarizer under test to make the abnormal polarizer under test return to normal, thereby reducing the cost of the polarizer under test.

[0073] This embodiment provides a method for analyzing and processing abnormal display of a liquid crystal display screen. When the liquid crystal display screen shows an abnormality, this analysis and processing method determines whether the polarizer under test in the liquid crystal display screen is abnormal. When it is determined that the polarizer under test is abnormal, the abnormal polarizer under test is analyzed to obtain an analysis result. Since the cause of the abnormality of the polarizer under test can be preliminarily determined according to the analysis result, in this embodiment, a test scenario is set according to the analysis result and at least one polarizer to be used is placed in the test scenario to reproduce the failure, so as to further determine the actual cause of the abnormality of the polarizer under test. After determining the actual cause of the abnormality of the polarizer under test, the unused polarizer can be improved according to the actual cause to improve the yield of the unused polarizer, thereby improving the problem that the polarizer is prone to abnormalities, and further improving the yield of the liquid crystal display screen. In summary, this embodiment provides a method for analyzing and processing abnormal display of a liquid crystal display screen, which can determine the actual cause of the abnormal display of the liquid crystal display screen and is beneficial to improving the yield of the liquid crystal display screen.

[0074] Optionally, Figure 2 is a schematic flowchart of another method for analyzing and processing abnormal display of a liquid crystal display screen according to an embodiment of the present invention. Refer to Figure 2 This embodiment provides a method for analyzing and processing abnormal display of a liquid crystal display screen, including the following steps:

[0075] S210. Place the liquid crystal display screen on the light-emitting side of the backlight source.

[0076] Among them, the content of step S210 is the same as the content of step S110. For the description of step S210, please refer to the description of step S110, which will not be repeated here.

[0077] S220. When it is determined that the liquid crystal display screen shows an abnormality, determine whether the polarizer under test in the liquid crystal display screen is abnormal.

[0078] Among them, the content of step S220 is the same as the content of step S120. For the description of step S220, please refer to the description of step S120, which will not be repeated here.

[0079] If not, then execute step S230.

[0080] If so, steps S240 to S290 are sequentially executed.

[0081] S230. Determine that the liquid crystal cell is abnormal.

[0082] Among them, the content of step S230 is the same as that of step S130. For the description of step S230, please refer to the description of step S130 for details and will not be repeated here.

[0083] S240. Slice the abnormal polarizer to be measured and determine the thickness change and element change of each film layer in the polarizer to be measured after slicing, so as to obtain the first result.

[0084] Specifically, the first result includes the thickness change and element change of each film layer in the abnormal polarizer to be measured. The film layers in the polarizer to be measured can be a polyvinyl alcohol layer, a cellulose acetate layer, and a pressure-sensitive adhesive layer. Figure 3 is a schematic diagram of the thickness of each film layer after slicing a polarizer to be used provided by an embodiment of the present invention. Refer to Figure 3 , Figure 3 in which L1 represents the thickness of the cellulose acetate layer on the first side of the polyvinyl alcohol layer; L2 represents the thickness of the polyvinyl alcohol layer; L3 represents the thickness of the cellulose acetate layer on the second side of the polyvinyl alcohol layer, and the first side and the second side of the polyvinyl alcohol layer are oppositely arranged; L4 represents the thickness of the pressure-sensitive adhesive.

[0085] When determining the thickness change of each film layer in the polarizer to be measured after slicing, one method can be: only seal and slice the abnormal polarizer to be measured, and then detect the thickness of each film layer in the polarizer to be measured by a scanning electron microscope (SEM), and compare the detected thickness with the thickness of the corresponding polarizer to be used, so as to determine whether the thickness of each film layer is too large or too small. The thickness of each film layer in the polarizer to be used can be detected in advance. Another method can be: seal and slice the abnormal polarizer to be measured and the polarizer to be used, and then observe the layer thickness of each film layer of the polarizer to be measured through SEM to observe whether the thickness of each film layer of the polarizer to be measured is too large or too small (compared with the polarizer to be used). If the thickness change of each film layer in the polarizer to be measured after slicing is obvious, it indicates that there may be a problem with the method of manufacturing the polarizer to be measured. Subsequently, when the inventor includes obvious film layer thickness changes in the analysis results, the method of manufacturing the polarizer to be measured can be improved to ensure the yield of the subsequent manufactured polarizer to be measured.

[0086] The method for determining the element change of each film layer in the polarizer to be measured after slicing can be: test the element composition of each film layer material by an energy dispersive spectrometer (EDS) to check whether there are abnormal element contaminations or obvious changes in the element content of each film layer material.

[0087] S250, placing the abnormal polarizer to be tested in a set solvent and soaking it for a first set time, and peeling off the polarizer to be tested after soaking to obtain a multi-layer film layer.

[0088] Specifically, in order to further determine the cause of the abnormality of the polarizer to be tested, this embodiment first determines the film layer that causes the abnormality of the polarizer to be tested (the film layer is located in the abnormal polarizer to be tested). Since the polarizer to be tested is tightly bonded, the film layers cannot be peeled off directly by mechanical unsealing. In this embodiment, the abnormal polarizer to be tested is placed in a set solvent and soaked for a first set time, and then a blade is used to peel off the abnormal polarizer to be tested. After soaking, the polarizer to be tested is peeled off, and each film layer of the polarizer to be tested can be completely peeled off. Exemplarily, the peeled film layers include a pressure-sensitive adhesive layer, two cellulose acetate layers, and a middlemost polyvinyl alcohol layer.

[0089] S260, determining the film layer that causes the abnormality of the polarizer to be tested.

[0090] Specifically, after each film layer in the polarizer to be tested is peeled off, the material composition of each film layer can be analyzed to determine the film layer that causes the abnormal polarizer to be tested. For example, if the material composition of a film layer in the abnormal polarizer to be tested is exactly the same as the material cost of the same type of film layer in the polarizer to be used, it can be determined that the film layer is not abnormal, and it is determined that the film layer does not cause the abnormal polarizer to be tested. If the material composition of a film layer in the abnormal polarizer to be tested is significantly different from the material composition of the same type of film layer in the polarizer to be used, and the material composition of the other remaining film layers has not changed, it can be determined that the film layer causes the abnormal polarizer to be tested.

[0091] After peeling off each film layer in the polarizer to be tested, each film layer can be overlapped with the polarizer to be used to form a first polarizer group, and observed under a luminous backlight source. When the first polarizer group shows a reddening phenomenon, the film layer that causes the abnormality of the polarizer to be tested can be confirmed. For example, the peeled polyvinyl alcohol layer is overlapped with the polarizer to be used and placed on the light output side of the luminous backlight source. If the reddening phenomenon is detected, it is determined that the film layer that causes the abnormality of the polarizer to be tested is the polyvinyl alcohol layer.

[0092] S270, analyzing the components of the film layer that causes the abnormality of the polarizer to be tested to obtain a second result, where the analysis result includes the first result and the second result.

[0093] Specifically, after determining the film layer that causes the abnormality of the polarizer to be tested, in order to further find the cause of the abnormality of the polarizer to be tested, the composition of the abnormal film layer can be analyzed, and at least one of a micro-infrared spectrometer, a thermogravimetric analyzer, a differential scanning calorimeter, a gas phase mass spectrometer and a Raman spectrometer can be used to analyze the film layer that causes the abnormality of the polarizer to be tested, and the result after the analysis is the second result.

[0094] S280. Set up a test scenario according to the analysis results, and place at least one polarizer to be used in the test scenario for verification tests.

[0095] Among them, the content of step S280 is the same as that of step S150. For the description of step S280, please refer to the description of step S150, which will not be elaborated here.

[0096] S290. After the verification test is completed, determine the actual cause of the abnormality of the polarizer to be tested based on the analysis results, the test results of the polarizer to be used, and the test scenario.

[0097] Among them, the content of step S290 is the same as that of step S160. For the description of step S290, please refer to the description of step S160, which will not be elaborated here.

[0098] Optionally, the set solvent includes ultrapure water; the first set duration includes 5 s to 10 s.

[0099] Specifically, setting the range of the first set duration to 5 s to 10 s can avoid the soluble substances in the film layer from dissolving into the set solvent due to too long soaking time, resulting in incorrect analysis results. The first set duration can be 5 s, 5.5 s, 6 s, 8 s, 9 s, 10 s, etc. Figure 4 is a schematic diagram of the structure of the polyvinyl alcohol layer peeled off after the polarizer to be tested is soaked in ultrapure water for the first set duration. Refer to Figure 4 , after the polarizer to be tested is soaked in ultrapure water for the first set duration and then peeled off, a complete film layer can be obtained. It can be seen that setting the set solvent as ultrapure water and the first set duration within the range of 5 s to 10 s can not only improve the peeling quality, but also reduce the peeling duration and improve the peeling efficiency.

[0100] Optionally, determining the film layer that causes the abnormality of the polarizer to be tested includes: placing each peeled film layer on the light-emitting side of the backlight source after overlapping it with the polarizer to be used respectively. If the first polarizer group formed after the current film layer is overlapped with the polarizer to be used shows a red color under the backlight source, it is determined that the current film layer is the film layer that causes the abnormality of the polarizer to be tested.

[0101] Exemplarily, the peeled polarizer to be tested includes a pressure-sensitive adhesive layer, two cellulose acetate layers, and a polyvinyl alcohol layer in the middle layer. When determining the film layer that causes the abnormality of the polarizer to be tested, the pressure-sensitive adhesive layer can be first overlapped with the polarizer to be used and placed on the light-emitting side of the backlight source. If it is detected that the first polarizer group composed of the pressure-sensitive adhesive layer and the polarizer to be used does not show redness, then another film layer is replaced, such as the polyvinyl alcohol layer. The polyvinyl alcohol layer is overlapped with the polarizer to be used and placed on the light-emitting side of the backlight source. If it is detected that the first polarizer group composed of the polyvinyl alcohol layer and the polarizer to be used shows redness, then it is determined that the film layer causing the abnormality of the polarizer to be tested is the polyvinyl alcohol layer; if it is detected that the first polarizer group composed of the polyvinyl alcohol layer and the polarizer to be used does not show redness, then another film layer is replaced, such as the cellulose acetate layer, and the cellulose acetate layer is overlapped with the polarizer to be used and placed on the light-emitting side of the backlight source. The same method is used to determine whether the cellulose acetate layer causes the abnormality of the polarizer to be tested.

[0102] In this embodiment, by overlapping each film layer with the polarizer to be used and placing it on the light-emitting side of the backlight source to detect the display condition of the first polarizer group after overlapping, the film layer that causes the abnormality of the polarizer to be tested can be determined quickly and accurately.

[0103] Optionally, the components of the film layer that causes the abnormality of the polarizer to be tested are analyzed to obtain a second result, including: detecting at least one of the material change, thermal decomposition characteristic temperature change, weight loss mass change, phase transition temperature change, volatile component change, and set ion characteristic peak intensity ratio change of the film layer that causes the abnormality of the polarizer to be tested to obtain the second result.

[0104] Specifically, the set ion characteristic peak intensity ratio can be the characteristic peak of I in the polyvinyl alcohol layer 5- and the triiodide anion (I 3-) ratio of characteristic peaks. The second result includes at least one of material change of the film layer causing the abnormality of the polarizer under test, change of thermal decomposition characteristic temperature, change of weight loss mass, change of phase transition temperature, change of volatile components, and change of set ion characteristic peak intensity ratio. The composition of the film layer causing the abnormality of the polarizer under test can be analyzed by a microscopic infrared spectrometer, a thermogravimetric analyzer, a differential scanning calorimeter, a gas chromatography-mass spectrometry, a Raman spectrometer. Exemplarily, the functional group types and absorption peak intensities of the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used are compared by using an infrared spectrometer to analyze whether the materials of the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used are the same. The thermal decomposition characteristic temperature and weight loss mass of the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used can be compared by a thermogravimetric analyzer to analyze whether the film layer causing the abnormality of the polarizer under test has degradation and aging crosslinking phenomena. For example, if the initial decomposition temperature is significantly advanced, it indicates that the film layer causing the abnormality of the polarizer under test has degraded. If the initial decomposition temperature is significantly delayed, it indicates that the film layer causing the abnormality of the polarizer under test has further crosslinked. The phase transition temperatures of the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used are compared by using a differential scanning calorimeter to analyze whether there are abnormal phenomena such as too high glass transition temperature and small molecule release in the film layer causing the abnormality of the polarizer under test. The film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used are directly removed and placed in a glass bottle, and the two film layers are baked under set conditions. The gas chromatography-mass spectrometry is used to compare the volatilized gases to judge whether the volatile components of the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used are consistent. When the film layer causing the abnormality of the polarizer under test is a polyvinyl alcohol layer, the film layer causing the abnormality of the polarizer under test and the same type of film layer in the polarizer to be used can be compared by a Raman spectrometer to judge whether 5- the intensity ratio of I 3- and I Figure 5 is a schematic diagram after detecting the polyvinyl alcohol layer causing the abnormality of the polarizer under test by using a Raman spectrometer according to an embodiment of the present invention. Refer to Figure 5 , Figure 5 in which the abscissa represents the beam and the ordinate represents the absorption intensity. Figure 5 106.14 in 5- represents the position of the characteristic peak intensity of I 3- and 156.17 represents the position of the characteristic peak intensity of I

[0105] Optionally, detecting the change of volatile components of the film layer causing the abnormality of the polarizer under test includes: placing the film layer causing the abnormality of the polarizer under test in a glass container and baking it for a second set time at a set temperature to detect the change of volatile components of the film layer causing the abnormality of the polarizer under test.

[0106] Specifically, the range of the set temperature can be 150°C to 180°C, and the range of the second set duration can be 10 min to 30 min. Exemplarily, the method for detecting the change in volatile components in the film layer causing the abnormality of the polarizer to be measured can be: directly putting the film layer causing the abnormality of the polarizer to be measured and the film layer of the same type in the polarizer to be used into a glass bottle, baking the film layer causing the abnormality of the polarizer to be measured and the film layer of the same type in the polarizer to be used at 150°C to 180°C for 10 min to 30 min, comparing the volatilized gases using a gas chromatography-mass spectrometry instrument, and determining whether the volatile components of the film layer causing the abnormality of the polarizer to be measured and the film layer of the same type in the polarizer to be used are consistent, so as to determine the change in the volatile components of the film layer causing the abnormality of the polarizer to be measured. If they are consistent, it can be determined that the volatile components have not changed. If they are inconsistent, it can be determined that the volatile components have changed.

[0107] Optionally, determining whether the polarizer to be measured in the liquid crystal display is abnormal includes the following steps:

[0108] S111. Peel off both layers of the polarizer to be measured from the liquid crystal display.

[0109] Specifically, when it is determined that the liquid crystal display shows an abnormality, the two whole-piece polarizers to be measured of the liquid crystal display can be peeled off, or the two layers of the polarizer to be measured at the abnormal position in the liquid crystal display can be peeled off.

[0110] S112. Determine the corresponding set polarizer according to the position of the peeled polarizer to be measured in the liquid crystal display.

[0111] Specifically, if the peeled polarizer to be measured is the upper polarizer, the corresponding set polarizer is the lower polarizer to be used. If the peeled polarizer to be measured is the lower polarizer, the corresponding set polarizer is the upper polarizer to be used.

[0112] S113. Overlap the peeled polarizer to be measured with its corresponding set polarizer to form a second polarizer group and place it on the light-emitting side of the backlight source, and detect whether the second polarizer group turns red.

[0113] Specifically, in this embodiment, the abnormality of the polarizer to be measured is detected by failure reproduction. If the second polarizer group turns red, it indicates that the polarizer to be measured in the second polarizer group is abnormal. If the second polarizer group does not turn red, it indicates that the polarizer to be measured in the second polarizer group is not abnormal. Figure 6 It is a display situation diagram of a second polarizer group formed by overlapping a polarizer to be measured and a set polarizer according to an embodiment of the present invention and placed on the light-emitting side of the backlight source. Refer to Figure 6, since the second polarizer group emits red light, it can be determined that the polarizer to be tested is abnormal. Figure 7 It is a diagram showing the display situation when a normal polarizer and a normal polarizer are overlapped and placed on the light-emitting side of a backlight source according to an embodiment of the present invention. Refer to Figure 7 , when two normal polarizers are overlapped and placed on the light-emitting side of a backlight source, no red light emission phenomenon will occur. Therefore, it is possible to accurately detect whether the polarizer to be tested is abnormal based on whether the second polarizer group emits red light. Exemplarily, place the liquid crystal display screen with abnormal display on the lit backlight panel, and observe the liquid crystal display screen with abnormal display by the naked eye to determine the red area of the liquid crystal display screen; peel off the upper polarizer and the lower polarizer at the red position of the liquid crystal display screen with abnormal display, and overlap them on the backlight source, and observe whether there is a red light emission phenomenon in the overlapped upper polarizer and lower polarizer. If there is a red light emission phenomenon, it indicates that the redness of the liquid crystal display screen is caused by an abnormal polarizer. In order to further determine which of the upper polarizer and the lower polarizer is abnormal, then overlap the peeled upper polarizer with the unused lower polarizer, and overlap the peeled lower polarizer with the upper polarizer to be used, and observe whether there is a red light emission phenomenon in the two groups of second polarizer groups under the lit backlight source. When red light emission occurs after the peeled upper polarizer and the lower polarizer to be used are overlapped, it indicates that the position causing the redness of the liquid crystal display screen is the upper polarizer, that is, the upper polarizer is abnormal; when red light emission occurs after the peeled lower polarizer and the upper polarizer to be used are overlapped, it indicates that the position causing the redness of the liquid crystal display screen is the lower polarizer, that is, the lower polarizer is abnormal.

[0114] In summary, this embodiment can quickly and accurately determine the abnormal polarizer to be tested in the liquid crystal display screen, thereby improving the analysis and processing efficiency of the abnormal display of the liquid crystal display screen.

[0115] Optionally, after determining the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test results of each polarizer to be used, and each test scenario, it further includes:

[0116] Processing the abnormal polarizer to be tested according to the actual cause to make it normal, or improving the polarizer to be used according to the actual cause.

[0117] Specifically, after determining the actual cause of the abnormality of the polarizer to be tested, determine whether the abnormal polarizer to be tested can be restored to normal based on the actual cause. If so, the abnormal polarizer to be tested is processed to restore it to normal so that it can continue to be used. For example, when the actual cause is that moisture has penetrated into the polarizer to be tested, causing the polarizer to be tested to be abnormal, the edge of the polarizer to be used can be sealed with an adhesive by adding a glue frame to reduce the impact of external gas infiltration on the performance of the polarizer to be used. If the actual cause is the infiltration of organic solvents or the immersion of volatile elements, the polarizer to be tested can be restored to normal by baking. If the actual cause is caused by temperature, the use temperature of the polarizer to be used needs to be considered in subsequent use, and the use in high temperature environments should be minimized to increase the service life of the polarizer to be used.

[0118] Optionally, determining that the LCD screen displays abnormally includes determining that the LCD screen displays red.

[0119] Specifically, when the abnormality of the liquid crystal display screen is redness, the liquid crystal display screen display abnormality analysis and processing method provided in this embodiment can more accurately analyze the reason for the redness of the display.

[0120] In order to better understand the liquid crystal display screen display abnormality analysis and processing method provided by the embodiment of the present invention, a specific embodiment will be introduced below:

[0121] (1) The abnormal LCD screen is placed on the luminous backlight panel. The edge of the abnormal LCD screen shows obvious redness. The LCD box at the bottom of the red position of the abnormal LCD screen is observed through the polarizer under test using a stereo microscope. No obvious abnormality is observed on the surface of the LCD box at the bottom of the abnormal LCD screen. The abnormal LCD screen can also be understood as a failed LCD screen.

[0122] (2) The upper polarizer and the lower polarizer at the red position of the abnormal LCD screen are peeled off and placed on top of each other on the backlight source. The overlapped upper polarizer and the lower polarizer are red. Then the unused upper polarizer and the lower polarizer of the abnormal LCD screen are overlapped and placed on the backlight source. The two overlapped polarizers are still red. Finally, the unused lower polarizer and the upper polarizer of the abnormal LCD screen are overlapped and placed on the backlight source. The redness disappears. It is inferred that the position of the abnormal LCD screen that causes the redness is located on the lower polarizer.

[0123] (3) Seal and slice the abnormal lower polarizer and the unused lower polarizer. The interiors of the abnormal lower polarizer and the unused lower polarizer mainly consist of four layers. The layer thicknesses and elemental compositions of the respective films of the abnormal lower polarizer and the unused lower polarizer are similar. Among them, iodine elements exist in the PVA layer, but the iodine element content in the PVA layer of the abnormal lower polarizer is low.

[0124] (4) Immerse the lower polarizer of the liquid crystal display screen showing abnormalities in ultrapure water for 5 s, and then strip each film layer of the abnormal lower polarizer with a blade. Under the backlight, when the two cellulose acetate layers and the pressure-sensitive adhesive layer overlap with the unused lower polarizer, no redness phenomenon occurs. When the PVA layer overlaps with the unused lower polarizer, a redness phenomenon occurs. This indicates that the abnormal film layer of the lower polarizer of the liquid crystal display screen causing the display abnormality is located in the PVA layer.

[0125] (5) Analyze the PVA layer of the abnormal lower polarizer and the PVA layer of the unused lower polarizer with a Raman spectrometer. The PVA layer in the abnormal lower polarizer and the PVA layer in the unused lower polarizer both show characteristic peaks of I -1 at 106.14 cm 3- , and characteristic peaks of I -1 at 157.56 cm 5- . Among them, the intensity ratio of the characteristic peaks of I 5- to I 3- in the PVA layer of the abnormal lower polarizer is 0.78, and the intensity ratio of the characteristic peaks of I 5- to I 3- in the PVA layer of the unused lower polarizer is 1.03. It can be seen that the content of I 5- in the abnormal lower polarizer has decreased.

[0126] (6) Cut 2 pieces of the unused lower polarizer and place them in a high-temperature test chamber at 85 °C and a damp heat test chamber at 85 °C and 90% RH respectively. After placing them for 96 h, stack the unused upper polarizer with the unused lower polarizer placed at 85 °C and 90% RH for 96 h and the unused lower polarizer placed at 85 °C for 96 h on the backlight respectively. The light transmitted after the unused upper polarizer is stacked with the unused lower polarizer placed at 85 °C and 90% RH is red, and the light transmitted after the unused upper polarizer is stacked with the unused lower polarizer placed at 85 °C for 96 h is white. This indicates that under the action of moisture, the color of the light transmitted by the unused lower polarizer will change.

[0127] (7) After comprehensive analysis, the reason for the redness of the liquid crystal display screen caused by the abnormality of the polarizer is that the infiltration of moisture causes the I 5-The content has decreased, resulting in insufficient absorption of red light by the PVA layer and causing the liquid crystal display screen to show a red tint.

[0128] (8) An acrylic rubber frame is added around the polarizer of the unused liquid crystal display screen to reduce the infiltration of water vapor. During subsequent use, the redness phenomenon of the liquid crystal display screen disappears.

[0129] It should be noted that the backlight sources provided in any embodiment of the present invention are all backlight sources that emit light, and the emission color of the backlight source is set according to test requirements. The emission color of the backlight source can be white light. The polarizers to be used described in this embodiment are all normal polarizers.

[0130] Figure 8 is a schematic structural diagram of a device for analyzing and processing abnormal display of a liquid crystal display screen provided according to an embodiment of the present invention. Refer to Figure 8 , the liquid crystal display screen includes a liquid crystal cell and two layers of polarizers to be tested; the device for analyzing and processing abnormal display of the liquid crystal display screen includes a first determination module 210, an analysis module 220, a test module 230, and a second determination module 240; the first determination module 210 is used to determine whether the polarizer to be tested in the liquid crystal display screen is abnormal when it is determined that the liquid crystal display screen shows abnormal display; the analysis module 220 is used to analyze the abnormal polarizer to be tested to obtain an analysis result; the test module 230 is used to set a test scenario according to the analysis result and place at least one polarizer to be used in the test scenario for verification testing; the second determination module 240 is used to determine the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test result of the polarizer to be used, and the test scenario after the verification test is completed.

[0131] The device for analyzing and processing abnormal display of a liquid crystal display screen provided in this embodiment has corresponding beneficial effects with the method for analyzing and processing abnormal display of a liquid crystal display screen provided in any embodiment of the present invention. For the technical details not elaborated in this embodiment, please refer to the method for analyzing and processing abnormal display of a liquid crystal display screen provided in any embodiment of the present invention.

[0132] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0133] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for analyzing and processing abnormal display of a liquid crystal display screen, characterized in that: The liquid crystal display screen includes a liquid crystal cell and two layers of polarizers to be tested; The liquid crystal display screen display abnormality analysis and processing method comprises: When it is determined that the liquid crystal display screen displays abnormally, determining whether the polarizer to be tested in the liquid crystal display screen is abnormal; If yes, analyzing the abnormal polarizer to be tested to obtain an analysis result; A test scene is set up according to the analysis results, and at least one polarizer to be used is placed in the test scene for verification testing; After the verification test is completed, the actual cause of the abnormality of the polarizer to be tested is determined according to the analysis result, the test result of the polarizer to be used and the test scenario.

2. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 1, characterized in that: The analysis results include a first result and a second result; The analyzing the abnormal polarizer to be tested to obtain an analysis result includes: Slicing the abnormal polarizer to be tested and determining the thickness change of each film layer and the element change of each film layer in the polarizer to be tested after slicing to obtain the first result; placing the abnormal polarizer to be tested in a set solvent and soaking it for a first set time, and peeling off the polarizer to be tested after soaking to obtain a multi-layer film layer; Determining the film layer causing the abnormality of the polarizer to be tested; The components of the film layer that causes the abnormality of the polarizer to be tested are analyzed to obtain the second result.

3. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 2, characterized in that: The set solvent includes ultrapure water; the first set time includes 5s to 10s.

4. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 2, characterized in that: The determining of the film layer causing the abnormality of the polarizer to be tested comprises: Each of the peeled off film layers is overlapped with the polarizer to be used and placed on the light-emitting side of the backlight source. If the first polarizer group formed by overlapping the current film layer and the polarizer to be used turns red under the backlight source, it is determined that the current film layer is the film layer that causes the abnormality of the polarizer to be tested.

5. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 2, characterized in that: The step of analyzing the components of the film layer causing the abnormality of the polarizer to be tested to obtain the second result includes: The second result is obtained by detecting at least one of the material change of the film layer causing the abnormality of the polarizer to be tested, the change of the thermal decomposition characteristic temperature, the weight loss mass change, the phase transition temperature change, the volatile component change and the change of the set ion characteristic peak intensity ratio.

6. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 5, characterized in that: Detecting the change of the volatile component of the film layer causing the abnormality of the polarizer to be tested includes: The film layer causing the abnormality of the polarizer to be tested is placed in a glass container and baked at a set temperature for a second set time to detect changes in volatile components of the film layer causing the abnormality of the polarizer to be tested.

7. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 1, characterized in that: The step of determining whether the polarizer to be tested in the liquid crystal display screen is abnormal comprises: Peeling off the two layers of the polarizer to be tested from the liquid crystal display screen; Determine a corresponding set polarizer according to the position of the peeled-off polarizer to be tested in the liquid crystal display screen; The peeled-off polarizer to be tested is overlapped with its corresponding set polarizer to form a second polarizer group, which is placed on the light-emitting side of the backlight source, and the second polarizer group is tested to see whether it is red.

8. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 1, characterized in that: After determining the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test results of each polarizer to be used and each test scenario, the method further includes: The abnormal polarizer to be tested is processed according to the actual cause to restore it to normal, or the polarizer to be used is improved according to the actual cause.

9. The method for analyzing and processing abnormal display of a liquid crystal display screen according to claim 1, characterized in that: Determining that the liquid crystal display screen displays abnormally includes determining that the liquid crystal display screen displays red.

10. A liquid crystal display screen display abnormality analysis and processing device, characterized in that: The liquid crystal display screen includes a liquid crystal box and two layers of polarizers to be tested; the liquid crystal display screen display abnormality analysis and processing device includes a first determination module, an analysis module, a test module and a second determination module; The first determination module is used to determine whether the polarizer to be tested in the liquid crystal display screen is abnormal when it is determined that the liquid crystal display screen displays abnormally; The analysis module is used to analyze the abnormal polarizer to be tested to obtain an analysis result; The test module is used to set a test scene according to the analysis result, and place at least one polarizer to be used in the test scene for verification test; The second determination module is used to determine the actual cause of the abnormality of the polarizer to be tested according to the analysis result, the test result of the polarizer to be used and the test scenario after the verification test is completed.

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