Liquid crystal display module testing system and testing method thereof

Abstract

The present invention discloses a liquid crystal display module testing system and a testing method thereof, which relate to the technical field of display screen testing. The system comprises the following modules: a visual inspection module, which establishes a qualified pasting database, and takes pictures of a glass substrate after pasting a polarizer; in this scheme, a visual inspection is performed on a test object by the visual inspection module, and then an instrument inspection is performed on the test object by an instrument inspection module; finally, a test result confirmation module performs data processing on the instrument inspection value and the visual inspection value to obtain a detection coefficient, compares the detection coefficient of the test object with a set detection coefficient preset threshold, and comprehensively judges whether the polarizer of the test object is pasted qualified based on the comparison result, thereby improving the accuracy of the test result and reducing the workload of manual inspection. During the production and processing of the liquid crystal display module, it is convenient for the inspection and testing to keep up with the production and processing progress, and improving the production and testing efficiency of the liquid crystal display module.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen testing, and in particular to a liquid crystal display screen module testing system and a testing method thereof. Background Art

[0002] Liquid crystal display modules are an important component of display devices. They are usually composed of liquid crystal panels, backlights, drive circuits, and other parts. Liquid crystal display modules are characterized by being thin, light, low power, and high resolution. They can present clear and vivid images and texts and are widely used in various electronic devices such as smartphones, tablets, TVs, and computer monitors.

[0003] The LCD panel is composed of a glass substrate, polarizer, liquid crystal material and color filter. The polarizer is adhered to the surface of the glass substrate to convert natural light into polarized light in a specific direction. Therefore, the correct attachment of the polarizer in the entire LCD module is particularly important, which directly affects the display effect of the LCD.

[0004] With the rapid development of the display industry, most companies producing displays have initially achieved automated pasting of polarizers and glass substrates. Replacing manual labor with mechanical pasting has greatly improved production efficiency. However, mechanical automated pasting of polarizers can also result in pasting defects, such as bubbles between the polarizer and the glass substrate, pasting wrinkles, and press scratches and indentations on the polarizer surface. Therefore, multiple tests are required during the production process of LCD display modules, and polarizer pasting inspection is one of them. In order to keep up with the production efficiency of automated polarizer pasting, polarizer pasting inspection also needs intelligent automation to replace manual inspection. To this end, we propose a LCD display module testing system and testing method. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a liquid crystal display module testing system and a testing method thereof to solve the above-mentioned problems in the prior art.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A liquid crystal display module testing system includes the following modules:

[0009] The visual inspection module establishes a qualified pasting database, takes a picture of the glass substrate after the polarizer is pasted, extracts the contrast of the captured picture and compares it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified;

[0010] The instrument detection module uses a transmittance detector to obtain the transmittance of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The polarization degree detector obtains the polarization of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The instrument detection value is obtained by the transmittance and polarization degree;

[0011] The test result confirmation module obtains the visual test value and the instrument test value, obtains the test coefficient based on the visual test value and the instrument test value, sets a preset threshold value for the test coefficient, and determines whether the polarizer is pasted properly by comparing the test coefficient with the preset threshold value for the test coefficient;

[0012] The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product based on the production information of the glass substrate with unqualified polarizer pasting, and conducts a second re-inspection on the suspicious product.

[0013] Preferably, a qualified paste database is established in the visual inspection module, specifically:

[0014] Step 1: Obtain ten samples of polarizers correctly attached to glass substrates, and take pictures of the ten samples from multiple angles to obtain ten sets of sample pictures;

[0015] Step 2: grayscale processing is performed on ten groups of sample images respectively, and the contrast of the ten groups of grayscale processed photos is obtained respectively. The contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast value of the ten groups of samples;

[0016] Step 3: Arrange the contrast means of the ten groups of samples in order from small to large, obtain the sample with the smallest contrast mean as the lowest sample contrast mean, obtain the sample with the largest contrast as the highest sample contrast mean, formulate the interval from the lowest sample contrast mean to the highest sample contrast mean to obtain the contrast interval of qualified products, and include the contrast interval of qualified products and the contrast means of the ten groups of samples into the pasting qualified database to establish a pasting qualified database.

[0017] Preferably, in the visual inspection module, a picture of the glass substrate after the polarizer is attached is taken, and the contrast of the taken picture is extracted and compared with the database of qualified attachments to obtain a visual inspection value and determine whether the inspected product is qualified, specifically:

[0018] Step 1: Take multiple test images from multiple angles of the glass substrate with the polarizer attached, perform grayscale processing on the multiple test images, and obtain the highest brightness and lowest brightness of the multiple grayscale processed test images;

[0019] Step 2: Difference the highest brightness and lowest brightness of multiple grayscale processed test images to obtain the contrast of multiple test images, obtain the contrast range of qualified products, and judge whether the contrast of multiple test images is within the contrast range of qualified products. If the contrast of multiple test images is within the contrast range of qualified products, the test product is defined as qualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product. If the contrast of multiple test images is not within the contrast range of qualified products, the test product is defined as unqualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product.

[0020] Preferably, in the instrument detection module, the transmittance of the glass substrate after the polarizer is attached is obtained by a transmittance detector and whether the test product is qualified is determined, specifically:

[0021] Step 1: Place ten qualified glass substrates in a transmittance tester to obtain ten transmittance reference values, and place ten qualified glass substrate samples with polarizers attached in a transmittance tester to obtain ten transmittance values;

[0022] Step 2: Taking the quotients of the ten reference transmittance values ​​and their corresponding ten transmittance values ​​to obtain ten reference transmittances, arranging the ten reference transmittances from small to large, taking the smallest of the reference transmittances as the minimum reference transmittance, and taking the largest of the reference transmittances as the maximum reference transmittance, and obtaining the transmittance qualification range by comparing the minimum reference transmittance and the maximum reference transmittance;

[0023] Step 3: Place the test product into the transmittance tester to obtain the transmittance of the test product, and determine whether the transmittance of the test product is within the qualified transmittance range. If the transmittance of the test product is within the qualified transmittance range, mark the test product as qualified; if the transmittance of the test product is not within the qualified transmittance range, mark the test product as unqualified.

[0024] Preferably, in the instrument detection module, a polarization degree detector is used to obtain the polarization rate of the glass substrate after the polarizer is attached and to determine whether the test product is qualified, specifically:

[0025] Step 1: Prepare ten qualified samples of equal area, divide the area of ​​each of the ten qualified samples into nine equal parts, place each equal part of each qualified sample into a polarization degree detector to obtain ninety reference polarization degrees, and sum and average the corresponding nine reference polarization degrees of the ten qualified samples to obtain ten reference polarization degree means;

[0026] Step 2: Arrange the ten reference polarization degree means from small to large, use the smallest of the ten reference polarization degree means as the minimum reference polarization degree mean, use the largest of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval by comparing the minimum reference polarization degree mean and the maximum reference polarization degree mean.

[0027] Step 3: Divide the area of ​​the test piece into nine equal parts, and place each divided area of ​​the test piece into a polarization detector to obtain nine detected polarization degrees. Determine whether the nine detected polarization degrees are within the reference polarization mean range. If all nine detected polarization degrees are within the reference polarization mean range, the test piece is marked as qualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate. If not all nine detected polarization degrees are within the reference polarization range, the test piece is marked as unqualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate.

[0028] Preferably, the calculation method of the instrument detection value in the instrument detection module is as follows:

[0029]

[0030] Among them, Yz represents the instrument detection value, Tv represents the transmittance, and Pv represents the polarization rate. and are weights,

[0031] Preferably, the calculation method of the detection coefficient in the detection result confirmation module is as follows:

[0032]

[0033] Among them, Js represents the detection coefficient, Sz represents the visual detection value, Yz represents the instrument detection value, δ1 and δ2 are both weights, 1>δ1>0, 1>δ2>0.

[0034] Preferably, a detection coefficient preset threshold is set in the detection result confirmation module, and whether the polarizer is pasted properly is determined by comparing the detection coefficient with the detection coefficient preset threshold, specifically:

[0035] Step 1: Set a preset threshold for the detection coefficient, obtain the detection coefficient of the test product, compare the preset threshold for the detection coefficient with the detection coefficient, and if the detection coefficient is less than the preset threshold for the detection coefficient, mark the test product as unqualified; if the detection coefficient is greater than the preset threshold for the detection coefficient, mark the test product as provisionally qualified;

[0036] Step 2: Obtain the visual inspection results of the provisionally qualified test products, and obtain the instrument inspection results of the provisionally qualified test products. If both the visual inspection results and the instrument inspection results of the test products are qualified, then mark the provisionally qualified test products as qualified. If both the visual inspection results and the instrument inspection results of the test products are not qualified, then mark the test products and send them to the manual inspection placement area, and determine whether the test products are qualified through manual inspection.

[0037] Preferably, the product locking module can be:

[0038] Step 1: Obtain the information of the pasting equipment of the unqualified test products, obtain the pasting processing time of the unqualified test products, capture all the test products that the pasting equipment of the unqualified test products produced after the pasting processing time of the unqualified test products, and mark them as suspicious products;

[0039] Step 2: The suspicious product is inspected again through the visual inspection module and the instrument inspection module, and the suspicious product information and re-inspection results are fed back to the management personnel.

[0040] A method for testing a liquid crystal display module comprises the following steps:

[0041] Step 1: Establish a qualified pasting database. Take a picture of the glass substrate after pasting the polarizer. Extract the contrast of the captured picture and compare it with the qualified pasting database to obtain the visual inspection value and determine whether the inspected product is qualified.

[0042] Step 2: Use a transmittance tester to obtain the transmittance of the glass substrate after the polarizer is attached and determine whether the test product is qualified. Use a polarization tester to obtain the polarization of the glass substrate after the polarizer is attached and determine whether the test product is qualified. The instrument test value is obtained by the transmittance and polarization.

[0043] Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients based on the visual inspection values ​​and instrument inspection values, set a preset threshold for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold for the inspection coefficient;

[0044] Step 4: Obtain the production information of the glass substrate with unqualified polarizer pasting, identify the suspicious product through the production information of the glass substrate with unqualified polarizer pasting, and conduct a second re-inspection on the suspicious product.

[0045] (3) Beneficial effects

[0046] The present invention provides a liquid crystal display module testing system and a testing method thereof, which have the following beneficial effects:

[0047] (1) In this solution, the visual inspection module is used to perform visual inspection on the inspection product, and then the instrument inspection module is used to perform instrument inspection on the inspection product. Finally, the inspection result confirmation module processes the instrument inspection value and the visual inspection value to obtain a detection coefficient. The inspection coefficient of the inspection product is compared with the preset threshold value of the inspection coefficient. The comparison result is used to comprehensively judge whether the polarizer of the inspection product is pasted properly, which is beneficial to improve the accuracy of the test results and reduce the workload of manual inspection. It is convenient for inspection and testing to keep up with the production and processing progress during the production and processing of the LCD display module, which is beneficial to improve the production and testing efficiency of the LCD display module;

[0048] (2) In this solution, the production line of unqualified products is locked by the suspicious product locking module. Since there is a high possibility that batches of unqualified products will appear in the subsequent pasting process due to equipment problems after the polarizer is unqualified, the suspicious product locking module can be used to mark and re-inspect the products after inspection, which is beneficial to further improve the accuracy of the inspection results. At the same time, it is also convenient for management personnel to carry out maintenance and management of the pasting equipment, which is beneficial to reduce the workload of manual inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural diagram of a liquid crystal display module testing system of the present invention;

[0050] Figure 2 This is a flowchart of a liquid crystal display module testing method of the present invention. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] See also Figure 1-Figure 2 The present invention provides a liquid crystal display module testing system, comprising the following modules:

[0053] The visual inspection module establishes a qualified pasting database, takes a picture of the glass substrate after the polarizer is pasted, extracts the contrast of the captured picture and compares it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified;

[0054] The instrument detection module uses a transmittance detector to obtain the transmittance of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The polarization degree detector obtains the polarization of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The instrument detection value is obtained by the transmittance and polarization degree;

[0055] The test result confirmation module obtains the visual test value and the instrument test value, obtains the test coefficient based on the visual test value and the instrument test value, sets a preset threshold value for the test coefficient, and determines whether the polarizer is pasted properly by comparing the test coefficient with the preset threshold value for the test coefficient;

[0056] The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product based on the production information of the glass substrate with unqualified polarizer pasting, and conducts a second re-inspection on the suspicious product;

[0057] The calculation method of the instrument detection value in the instrument detection module is as follows:

[0058]

[0059] Among them, Yz represents the instrument detection value, Tv represents the transmittance, and Pv represents the polarization rate. and are weights,

[0060] The calculation method of the detection coefficient in the detection result confirmation module is as follows:

[0061]

[0062] Among them, Js represents the detection coefficient, Sz represents the visual detection value, Yz represents the instrument detection value, δ1 and δ2 are both weights, 1>δ1>0, 1>δ2>0.

[0063] In this embodiment, in this solution, a qualified pasting database is established through a visual inspection module, and pictures of the inspected products are taken from multiple angles. The captured picture data is compared with the data in the qualified pasting database. Since the visual effects of bubbles and wrinkles on a glass substrate with a correctly pasted polarizer are different from those on the polarizer and the glass substrate, the qualified product is judged by visual data, thereby facilitating efficient and rapid judgment on the qualified product, which is beneficial to reducing the workload of manual inspection. During the production and processing of LCD display modules, it is convenient for inspection and testing to keep pace with the production and processing progress, which is beneficial to improving the production and testing efficiency of LCD display modules.

[0064] In this solution, the transmittance detector and polarization detector are used to detect the transmittance and polarization of the test product through the instrument detection module. The transmittance and polarization of the qualified product are compared with the transmittance and polarization of the test product to determine whether the test product is qualified. The instrument detection value is then combined with the polarization and transmittance of the test product to perform a comprehensive score on the test results of the test product, thereby facilitating a quick and accurate judgment on whether the test product is qualified, further helping to reduce the workload of manual detection, facilitating detection and testing to keep pace with the production and processing progress during the production and processing of LCD display modules, and helping to improve the production and testing efficiency of LCD display modules.

[0065] In this solution, the test result confirmation module processes the instrument detection value and the visual detection value to obtain the detection coefficient. The detection coefficient of the test product is compared with the preset detection coefficient threshold. The comparison result is used to comprehensively judge whether the polarizer of the test product is pasted properly, which is beneficial to improve the accuracy of the test results.

[0066] In this solution, the suspicious product locking module is used to lock the production line of unqualified products. Since there is a high possibility that batches of unqualified products will appear in the subsequent pasting process due to equipment problems after the polarizer is pasted unqualified, the suspicious product locking module can mark the tested products for re-inspection, which is beneficial to further improve the accuracy of the test results. It also makes it easier for management personnel to overhaul and manage the pasting equipment, which is beneficial to reduce the workload of manual inspection.

[0067] It is worth mentioning that the weight values ​​in this scheme can be obtained through the hierarchical analysis method, and the values ​​of the preset thresholds in this scheme can be obtained through the weight analysis method, which will not be elaborated here.

[0068] Establish a qualified paste database in the visual inspection module, specifically:

[0069] Step 1: Obtain ten samples of polarizers correctly attached to glass substrates, and take pictures of the ten samples from multiple angles to obtain ten sets of sample pictures;

[0070] Step 2: grayscale processing is performed on ten groups of sample images respectively, and the contrast of the ten groups of grayscale processed photos is obtained respectively. The contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast value of the ten groups of samples;

[0071] Step 3: Arrange the contrast means of the ten groups of samples in order from small to large, obtain the sample with the smallest contrast mean as the lowest sample contrast mean, obtain the sample with the largest contrast as the highest sample contrast mean, formulate the interval from the lowest sample contrast mean to the highest sample contrast mean to obtain the contrast interval of qualified products, and include the contrast interval of qualified products and the contrast means of the ten groups of samples into the pasting qualified database to establish a pasting qualified database.

[0072] In this embodiment, this scheme takes pictures of qualified samples and performs grayscale processing, so as to obtain the contrast range of qualified samples through the grayscale processed pictures. By establishing a qualified database, it is convenient to establish comparison standards for subsequent test products, and then facilitate the subsequent judgment of whether the test products are qualified.

[0073] In the visual inspection module, a picture of the glass substrate after the polarizer is attached is taken. The contrast of the captured picture is extracted and compared with the database of qualified attachments to obtain the visual inspection value and determine whether the inspected product is qualified. Specifically:

[0074] Step 1: Take multiple test images from multiple angles of the glass substrate with the polarizer attached, perform grayscale processing on the multiple test images, and obtain the highest brightness and lowest brightness of the multiple grayscale processed test images;

[0075] Step 2: Difference the highest brightness and lowest brightness of multiple grayscale processed test images to obtain the contrast of multiple test images, obtain the contrast range of qualified products, and judge whether the contrast of multiple test images is within the contrast range of qualified products. If the contrast of multiple test images is within the contrast range of qualified products, the test product is defined as qualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product. If the contrast of multiple test images is not within the contrast range of qualified products, the test product is defined as unqualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product.

[0076] In this embodiment, the contrast is obtained by taking the difference between the peak and valley brightness values ​​of the test product after grayscale processing, and then the contrast of the test product is compared with the contrast range of qualified products to determine whether the test product is qualified. This is beneficial to reduce the workload of manual inspection and improve inspection efficiency to meet the needs of efficient and fast mechanized polarizer pasting processing.

[0077] In the instrument detection module, the transmittance of the glass substrate after the polarizer is attached is obtained through the transmittance detector and the qualified product is judged. Specifically:

[0078] Step 1: Place ten qualified glass substrates in a transmittance tester to obtain ten transmittance reference values, and place ten qualified glass substrate samples with polarizers attached in a transmittance tester to obtain ten transmittance values;

[0079] Step 2: Taking the quotients of the ten reference transmittance values ​​and their corresponding ten transmittance values ​​to obtain ten reference transmittances, arranging the ten reference transmittances from small to large, taking the smallest of the reference transmittances as the minimum reference transmittance, and taking the largest of the reference transmittances as the maximum reference transmittance, and obtaining the transmittance qualification range by comparing the minimum reference transmittance and the maximum reference transmittance;

[0080] Step 3: Place the test product into the transmittance tester to obtain the transmittance of the test product, and determine whether the transmittance of the test product is within the qualified transmittance range. If the transmittance of the test product is within the qualified transmittance range, mark the test product as qualified; if the transmittance of the test product is not within the qualified transmittance range, mark the test product as unqualified.

[0081] In this embodiment, in this scheme, qualified products are tested by using a transmittance detector, and the test results of the qualified products are recorded and organized into a qualified transmittance range. The tested products are then placed in the transmittance detector for testing. The transmittance of the tested products is compared with the qualified transmittance range to determine whether the tested products are qualified, thereby facilitating a more accurate judgment on the test results of the tested products.

[0082] In the instrument detection module, the polarization rate of the glass substrate after the polarizer is attached is obtained through the polarization detector and the qualified product is judged. Specifically:

[0083] Step 1: Prepare ten qualified samples of equal area, divide the area of ​​each of the ten qualified samples into nine equal parts, place each equal part of each qualified sample into a polarization degree detector to obtain ninety reference polarization degrees, and sum and average the corresponding nine reference polarization degrees of the ten qualified samples to obtain ten reference polarization degree means;

[0084] Step 2: Arrange the ten reference polarization degree means from small to large, use the smallest of the ten reference polarization degree means as the minimum reference polarization degree mean, use the largest of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval by comparing the minimum reference polarization degree mean and the maximum reference polarization degree mean.

[0085] Step 3: Divide the area of ​​the test piece into nine equal parts, and place each divided area of ​​the test piece into a polarization detector to obtain nine detected polarization degrees. Determine whether the nine detected polarization degrees are within the reference polarization mean range. If all nine detected polarization degrees are within the reference polarization mean range, the test piece is marked as qualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate. If not all nine detected polarization degrees are within the reference polarization range, the test piece is marked as unqualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate.

[0086] In this embodiment, this scheme establishes a reference polarization degree mean interval, and then detects the polarization rates at different positions of the test product. The polarization rates at different positions of the test product are compared and judged based on the reference polarization degree mean interval, thereby further facilitating a more accurate judgment on whether the polarization rate of the test product is qualified, and further facilitating the judgment on whether the polarizer of the test product is qualified.

[0087] In the test result confirmation module, a preset threshold value of the detection coefficient is set. By comparing the detection coefficient with the preset threshold value, it is determined whether the polarizer is pasted properly. Specifically:

[0088] Step 1: Set a preset threshold for the detection coefficient, obtain the detection coefficient of the test product, compare the preset threshold for the detection coefficient with the detection coefficient, and if the detection coefficient is less than the preset threshold for the detection coefficient, mark the test product as unqualified; if the detection coefficient is greater than the preset threshold for the detection coefficient, mark the test product as provisionally qualified;

[0089] Step 2: Obtain the visual inspection results of the provisionally qualified test products, and obtain the instrument inspection results of the provisionally qualified test products. If both the visual inspection results and the instrument inspection results of the test products are qualified, then mark the provisionally qualified test products as qualified. If both the visual inspection results and the instrument inspection results of the test products are not qualified, then mark the test products and send them to the manual inspection placement area, and determine whether the test products are qualified through manual inspection.

[0090] In this embodiment, the present scheme obtains the detection coefficient by combining the visual detection value and the instrument detection value, and then compares the detection coefficient with the preset threshold value according to the set detection coefficient, so as to comprehensively judge whether the polarizer pasting of the detection product is qualified by combining the visual detection result and the instrument detection result, thereby further helping to improve the accuracy of the detection result. If the visual detection result and the instrument detection result of the detection product are not both qualified, the detection product is marked and sent to the manual inspection placement area, and whether the detection product is qualified is judged by manual inspection, which is helpful to avoid the omission of suspicious detection products, and the detection results of difficult-to-identify detection products are finalized by manual inspection.

[0091] You can lock modules to products, specifically:

[0092] Step 1: Obtain the information of the pasting equipment of the unqualified test products, obtain the pasting processing time of the unqualified test products, capture all the test products that the pasting equipment of the unqualified test products produced after the pasting processing time of the unqualified test products, and mark them as suspicious products;

[0093] Step 2: The suspicious product is inspected again through the visual inspection module and the instrument inspection module, and the suspicious product information and re-inspection results are fed back to the management personnel.

[0094] In this embodiment, the production line of unqualified inspected products is locked by a suspicious product locking module. Since there is a high possibility that batches of unqualified products will appear in the subsequent pasting process due to equipment problems after the polarizer is unqualified, the suspicious product locking module can be used to mark and re-inspect the inspected products, thereby further improving the accuracy of the inspection results. At the same time, it is also convenient for management personnel to carry out maintenance management of the pasting equipment, which is further beneficial to reducing the workload of manual inspection.

[0095] See also Figure 1-Figure 2 The present invention provides a liquid crystal display module testing system and a testing method thereof, comprising the following steps:

[0096] Step 1: Establish a qualified pasting database. Take a picture of the glass substrate after pasting the polarizer. Extract the contrast of the captured picture and compare it with the qualified pasting database to obtain the visual inspection value and determine whether the inspected product is qualified.

[0097] Step 2: Use a transmittance tester to obtain the transmittance of the glass substrate after the polarizer is attached and determine whether the test product is qualified. Use a polarization tester to obtain the polarization of the glass substrate after the polarizer is attached and determine whether the test product is qualified. The instrument test value is obtained by the transmittance and polarization.

[0098] Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients based on the visual inspection values ​​and instrument inspection values, set a preset threshold for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold for the inspection coefficient;

[0099] Step 4: Obtain the production information of the glass substrate with unqualified polarizer pasting, identify the suspicious product through the production information of the glass substrate with unqualified polarizer pasting, and conduct a second re-inspection on the suspicious product.

[0100] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those skilled in the art will appreciate that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0101] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0102] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

Claims

1. A liquid crystal display module testing system, characterized in that: Includes the following modules: The visual inspection module establishes a qualified pasting database, takes a picture of the glass substrate after the polarizer is pasted, extracts the contrast of the captured picture and compares it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified; The instrument detection module uses a transmittance detector to obtain the transmittance of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The polarization degree detector obtains the polarization of the glass substrate after the polarizer is attached and determines whether the test product is qualified. The instrument detection value is obtained by the transmittance and polarization degree; The test result confirmation module obtains the visual test value and the instrument test value, obtains the test coefficient based on the visual test value and the instrument test value, sets a preset threshold value for the test coefficient, and determines whether the polarizer is pasted properly by comparing the test coefficient with the preset threshold value for the test coefficient; The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product based on the production information of the glass substrate with unqualified polarizer pasting, and conducts a second re-inspection on the suspicious product; You can lock modules to products, specifically: Step 1: Obtain the information of the pasting equipment of the unqualified test products, obtain the pasting processing time of the unqualified test products, capture all the test products that the pasting equipment of the unqualified test products produced after the pasting processing time of the unqualified test products, and mark them as suspicious products; Step 2: The suspicious product is inspected again through the visual inspection module and the instrument inspection module, and the suspicious product information and re-inspection results are fed back to the management personnel.

2. The liquid crystal display module testing system according to claim 1, characterized in that: Establish a qualified paste database in the visual inspection module, specifically: Step 1: Obtain ten samples of polarizers correctly attached to glass substrates, and take pictures of the ten samples from multiple angles to obtain ten sets of sample pictures; Step 2: grayscale processing is performed on ten groups of sample images respectively, and the contrast of the ten groups of grayscale processed photos is obtained respectively. The contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast value of the ten groups of samples; Step 3: Arrange the contrast means of the ten groups of samples in order from small to large, obtain the sample with the smallest contrast mean as the lowest sample contrast mean, obtain the sample with the largest contrast as the highest sample contrast mean, formulate the interval from the lowest sample contrast mean to the highest sample contrast mean to obtain the contrast interval of qualified products, and include the contrast interval of qualified products and the contrast means of the ten groups of samples into the pasting qualified database to establish a pasting qualified database.

3. The liquid crystal display module testing system according to claim 2, characterized in that: In the visual inspection module, a picture of the glass substrate after the polarizer is attached is taken. The contrast of the captured picture is extracted and compared with the database of qualified attachments to obtain the visual inspection value and determine whether the inspected product is qualified. Specifically: Step 1: Take multiple test images from multiple angles of the glass substrate with the polarizer attached, perform grayscale processing on the multiple test images, and obtain the highest brightness and lowest brightness of the multiple grayscale processed test images; Step 2: Difference the highest brightness and lowest brightness of multiple grayscale processed test images to obtain the contrast of multiple test images, obtain the contrast range of qualified products, and judge whether the contrast of multiple test images is within the contrast range of qualified products. If the contrast of multiple test images is within the contrast range of qualified products, the test product is defined as qualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product. If the contrast of multiple test images is not within the contrast range of qualified products, the test product is defined as unqualified, and the average of the contrast of multiple test images is obtained to obtain the visual inspection value of the test product.

4. The liquid crystal display module testing system according to claim 1, wherein: In the instrument detection module, the transmittance of the glass substrate after the polarizer is attached is obtained through the transmittance detector and the qualified product is judged. Specifically: Step 1: Place ten qualified glass substrates in a transmittance tester to obtain ten transmittance reference values, and place ten qualified glass substrate samples with polarizers attached in a transmittance tester to obtain ten transmittance values; Step 2: Taking the quotients of the ten reference transmittance values ​​and their corresponding ten transmittance values ​​to obtain ten reference transmittances, arranging the ten reference transmittances from small to large, taking the smallest of the reference transmittances as the minimum reference transmittance, and taking the largest of the reference transmittances as the maximum reference transmittance, and obtaining the transmittance qualification range by comparing the minimum reference transmittance and the maximum reference transmittance; Step 3: Place the test product into the transmittance tester to obtain the transmittance of the test product, and determine whether the transmittance of the test product is within the qualified transmittance range. If the transmittance of the test product is within the qualified transmittance range, mark the test product as qualified; if the transmittance of the test product is not within the qualified transmittance range, mark the test product as unqualified.

5. The liquid crystal display module testing system according to claim 1, characterized in that: In the instrument detection module, the polarization rate of the glass substrate after the polarizer is attached is obtained through the polarization detector and the qualified product is judged. Specifically: Step 1: Prepare ten qualified samples of equal area, divide the area of ​​each of the ten qualified samples into nine equal parts, place each equal part of each qualified sample into a polarization degree detector to obtain ninety reference polarization degrees, and sum and average the corresponding nine reference polarization degrees of the ten qualified samples to obtain ten reference polarization degree means; Step 2: Arrange the ten reference polarization degree means from small to large, use the smallest of the ten reference polarization degree means as the minimum reference polarization degree mean, use the largest of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval by comparing the minimum reference polarization degree mean and the maximum reference polarization degree mean. Step 3: Divide the area of ​​the test piece into nine equal parts, and place each divided area of ​​the test piece into a polarization detector to obtain nine detected polarization degrees. Determine whether the nine detected polarization degrees are within the reference polarization mean range. If all nine detected polarization degrees are within the reference polarization mean range, the test piece is marked as qualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate. If not all nine detected polarization degrees are within the reference polarization range, the test piece is marked as unqualified, and the nine detected polarization degrees are summed and averaged to obtain the polarization rate.

6. The liquid crystal display module testing system according to claim 1, characterized in that: The calculation method of the instrument detection value in the instrument detection module is as follows: Wherein, Yz represents the instrument detection value, Tv represents the transmittance, Pv represents the polarization rate, θ1 and θ2 are both weights, 1>θ1>0, 1>θ2>0.

7. The liquid crystal display module testing system according to claim 1, characterized in that: The calculation method of the detection coefficient in the detection result confirmation module is as follows: Among them, Js represents the detection coefficient, Sz represents the visual detection value, Yz represents the instrument detection value, δ1 and δ2 are both weights, 1>δ1>0, 1>δ2>0.

8. The liquid crystal display module testing system according to claim 1, characterized in that: In the test result confirmation module, a preset threshold value of the detection coefficient is set. By comparing the detection coefficient with the preset threshold value, it is determined whether the polarizer is pasted properly. Specifically: Step 1: Set a preset threshold for the detection coefficient, obtain the detection coefficient of the test product, compare the preset threshold for the detection coefficient with the detection coefficient, and if the detection coefficient is less than the preset threshold for the detection coefficient, mark the test product as unqualified; if the detection coefficient is greater than the preset threshold for the detection coefficient, mark the test product as provisionally qualified; Step 2: Obtain the visual inspection results of the provisionally qualified test products, and obtain the instrument inspection results of the provisionally qualified test products. If both the visual inspection results and the instrument inspection results of the test products are qualified, then mark the provisionally qualified test products as qualified. If both the visual inspection results and the instrument inspection results of the test products are not qualified, then mark the test products and send them to the manual inspection placement area, and determine whether the test products are qualified through manual inspection.

9. A liquid crystal display module testing method, applied to a liquid crystal display module testing system according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Establish a qualified pasting database. Take a picture of the glass substrate after pasting the polarizer. Extract the contrast of the captured picture and compare it with the qualified pasting database to obtain the visual inspection value and determine whether the inspected product is qualified. Step 2: Use a transmittance tester to obtain the transmittance of the glass substrate after the polarizer is attached and determine whether the test product is qualified. Use a polarization tester to obtain the polarization of the glass substrate after the polarizer is attached and determine whether the test product is qualified. The instrument test value is obtained by the transmittance and polarization. Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients based on the visual inspection values ​​and instrument inspection values, set a preset threshold for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold for the inspection coefficient; Step 4: Obtain the production information of the glass substrate with unqualified polarizer pasting, identify the suspicious product through the production information of the glass substrate with unqualified polarizer pasting, and conduct a second re-inspection on the suspicious product.

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