Liquid crystal display module testing system and testing method thereof

Abstract

The invention discloses a liquid crystal display screen module testing system and a testing method thereof, and relates to the technical field of display screen testing, and the system comprises the following modules: a visual detection module which is used for establishing a pasting qualified database and shooting a picture of a glass substrate pasted with a polaroid; according to the scheme, the visual detection module is used for carrying out visual detection on a detected product, then the instrument detection module is used for carrying out instrument detection on the detected product, and finally the detection result confirmation module is used for carrying out data processing combination on an instrument detection value and a visual detection value to obtain a detection coefficient; the detection coefficient of the detected product is compared with the set detection coefficient preset threshold value, and whether the polaroid of the detected product is pasted qualified or not is comprehensively judged according to the comparison result, so that the accuracy of the test result is improved, the workload of manual detection is reduced, and the detection efficiency is improved. In the production and processing process of the liquid crystal display screen module, detection and testing follow the production and processing progress conveniently, and the production and testing efficiency of the liquid crystal display screen module is improved.

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 module is an important display device component, which is usually composed of liquid crystal panel, backlight, drive circuit and other parts. Liquid crystal display module has the characteristics of lightness, low power consumption and high resolution. It can present clear and bright images and texts, and is widely used in various electronic devices such as smart phones, tablet computers, TVs, computer monitors, etc.

[0003] The LCD panel is composed of a glass substrate, a polarizer, a liquid crystal material and a 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 pasting of the polarizer in the entire LCD display module is particularly important, which directly affects the display effect of the LCD display.

[0004] With the rapid development of the display field, most companies producing display screens have initially realized the automated pasting of polarizers and glass substrates. Mechanical pasting instead of manual labor has greatly improved production efficiency. However, mechanical automated pasting of polarizers may also result in pasting defects, such as bubbles between the polarizer and the glass substrate, pasting wrinkles, pressing scratches and indentations on the surface of the polarizer, etc. Therefore, a variety of tests are required in the production process of LCD display modules, and polarizer pasting detection is one of them. In order to keep up with the production efficiency of automated pasting of polarizers, polarizer pasting detection also needs intelligent automation to replace manual detection. For this reason, we propose a LCD display module testing system and a testing method thereof. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of 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] (II) 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, comprising the following modules:

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

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

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

[0012] The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product through 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 pasting database is established in the visual inspection module, specifically:

[0014] Step 1: Obtain ten samples of polarizers correctly attached to glass substrates, and take multi-angle pictures of the ten samples to obtain ten groups 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, and the contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast 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, establish 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 qualified pasting database to establish a qualified pasting database.

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

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

[0019] Step 2: Subtract the highest brightness and the lowest brightness of the multiple grayscale processed detection images to obtain the contrast of the multiple detection images, obtain the contrast range of qualified products, and judge whether the contrast of the multiple detection images is within the contrast range of qualified products. If the contrast of the multiple detection images is within the contrast range of qualified products, the detection product is defined as qualified, and the contrast of the multiple detection images is averaged to obtain the visual detection value of the detection product. If the contrast of the multiple detection images is not within the contrast range of qualified products, the detection product is defined as unqualified, and the contrast of the multiple detection images is averaged to obtain the visual detection value of the detection 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 detected 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 samples of glass substrates with polarizers attached in a transmittance tester to obtain ten transmittance values;

[0022] Step 2: respectively taking the quotients of the ten light transmittance reference values ​​and their corresponding ten light transmittance values ​​to obtain ten reference light transmittances, arranging the ten reference light transmittances from small to large, taking the smallest one of the reference light transmittances as the minimum reference light transmittance, taking the largest one of the reference light transmittances as the maximum reference light transmittance, and obtaining the light transmittance qualified range through the minimum reference light transmittance and the maximum reference light 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, the polarization rate of the glass substrate after the polarizer is attached is obtained by a polarization detector and whether the detected product is qualified is determined, specifically:

[0025] Step 1: prepare ten qualified samples of equal area, divide the area of ​​the ten qualified samples into nine equal parts, put 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, take the smallest one of the ten reference polarization degree means as the minimum reference polarization degree mean, take the largest one of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval through the minimum reference polarization degree mean and the maximum reference polarization degree mean;

[0027] Step 3: Divide the area of ​​the test object into nine equal parts, and place each divided area of ​​the test object into a polarization detector to obtain nine detected polarization degrees, and determine whether the nine detected polarization degrees are within the reference polarization mean range. If the nine detected polarization degrees are all 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 the nine detected polarization degrees are not all within the reference polarization range, the test object 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 specifically 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 specifically 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 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 value for the detection coefficient, obtain the detection coefficient of the detection product, compare the preset threshold value for the detection coefficient with the detection coefficient, if the detection coefficient is less than the preset threshold value for the detection coefficient, mark the detection product as unqualified, if the detection coefficient is greater than the preset threshold value for the detection coefficient, mark the detection product as provisionally qualified;

[0036] Step 2: Obtain the qualified visual inspection results of the provisionally qualified test products, and obtain the qualified 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 to determine whether the test products are qualified through manual inspection.

[0037] Preferably, a product locking module may be provided, specifically:

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

[0039] Step 2: Test the suspicious product twice through the visual inspection module and the instrument inspection module, and feedback the suspicious product information and re-inspection results 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 taken picture and compare it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified;

[0042] Step 2: Obtain the transmittance of the glass substrate after the polarizer is attached by a transmittance detector and judge whether the test product is qualified. Obtain the polarization of the glass substrate after the polarizer is attached by a polarization detector and judge whether the test product is qualified. Obtain the instrument detection value through the transmittance and polarization;

[0043] Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients through visual inspection values ​​and instrument inspection values, set a preset threshold value for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold value 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] (III) 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 scheme, 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 performs data processing on the instrument inspection value and the visual inspection value to obtain the inspection coefficient, and compares the inspection coefficient of the inspection product 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. In the production and processing of the LCD display module, it is convenient for the inspection and testing to keep up with the production and processing progress, 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 through 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 test 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 reduce the workload of manual inspection. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[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 pictures of the glass substrate after the polarizer is pasted, extracts the contrast of the taken pictures and compares them with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified;

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

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

[0056] The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product through 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 weights, 1>δ1>0, 1>δ2>0.

[0063] In this embodiment, in this scheme, a qualified pasting database is established through a visual inspection module, and pictures of the inspected products are taken from multiple angles, and the photographed picture data is compared with the data in the qualified pasting database. Since the visual effects of the glass substrate with the polarizer correctly pasted and the bubbles and wrinkles between the polarizer and the glass substrate are different, whether the inspected product is qualified is judged by visual data, which facilitates efficient and rapid judgment on whether the inspected product is qualified, which is beneficial to reducing the workload of manual inspection, and facilitates 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 improving the production and testing efficiency of the LCD display module;

[0064] In this scheme, the transmittance detector and polarization detector are used to detect the transmittance and polarization of the test product through the instrument detection module, and 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, and then the instrument detection value is obtained by combining the polarization and transmittance of the test product to perform a comprehensive score on the test results of the test product, so as to facilitate a quick and accurate judgment on whether the test product is qualified, which is further beneficial to reduce the workload of manual detection, and facilitate detection and testing to keep up with the production and processing progress during the production and processing of LCD display modules, which is beneficial to improve the production and testing efficiency of LCD display modules;

[0065] In this scheme, the test result confirmation module processes the instrument test value and the visual test value to obtain the test coefficient, compares the test coefficient of the test product with the preset test coefficient threshold, and comprehensively judges whether the polarizer of the test product is pasted properly through the comparison result, which is beneficial to improve the accuracy of the test result;

[0066] In this solution, the production line of unqualified products is locked through 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 tested products, which is further beneficial to improve the accuracy of the test results. At the same time, it is also convenient for management personnel to overhaul and manage the pasting equipment, which is further 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 multi-angle pictures of the ten samples to obtain ten groups 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, and the contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast 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, establish 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 qualified pasting database to establish a qualified pasting database.

[0072] In this embodiment, in this scheme, by taking pictures of qualified samples and performing grayscale processing, the contrast range of qualified samples is obtained through the pictures after grayscale processing, and 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, the glass substrate after the polarizer is attached is photographed, and the contrast of the photographed image is extracted and compared with the qualified attachment database 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 on the glass substrate with the polarizer attached, perform grayscale processing on the multiple test images, and obtain the highest brightness and the lowest brightness of the multiple grayscale processed test images respectively;

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

[0076] In this embodiment, in this scheme, the contrast is obtained by subtracting the peak and valley values ​​of the brightness 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, which is beneficial to reduce the workload of manual inspection and improve the 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 to determine whether the test product is qualified, specifically:

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

[0079] Step 2: respectively taking the quotients of the ten light transmittance reference values ​​and their corresponding ten light transmittance values ​​to obtain ten reference light transmittances, arranging the ten reference light transmittances from small to large, taking the smallest one of the reference light transmittances as the minimum reference light transmittance, taking the largest one of the reference light transmittances as the maximum reference light transmittance, and obtaining the light transmittance qualified range through the minimum reference light transmittance and the maximum reference light 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 qualified products are recorded and organized into a qualified transmittance range, and then the test products are put into the transmittance detector for testing, and the transmittance of the test products is compared with the qualified transmittance range to determine whether the test products are qualified, thereby facilitating a more accurate judgment on the test results of the test 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 whether the test product is qualified is determined, specifically:

[0083] Step 1: prepare ten qualified samples of equal area, divide the area of ​​the ten qualified samples into nine equal parts, put 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, take the smallest one of the ten reference polarization degree means as the minimum reference polarization degree mean, take the largest one of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval through the minimum reference polarization degree mean and the maximum reference polarization degree mean;

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

[0086] In this embodiment, in this scheme, a reference polarization degree mean interval is formulated, and then the polarization rates at different positions of the test product are tested. The polarization rates at different positions of the test product are compared and judged according to the reference polarization degree mean interval, so as to further facilitate a more accurate judgment on whether the polarization rate of the test product is qualified, and further facilitate the judgment on whether the polarizer pasting of the test product is qualified.

[0087] In the test result confirmation module, a preset threshold value of the detection coefficient is set, and whether the polarizer is pasted properly is determined by comparing the detection coefficient with the preset threshold value of the detection coefficient, specifically:

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

[0089] Step 2: Obtain the qualified visual inspection results of the provisionally qualified test products, and obtain the qualified 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 to determine whether the test products are qualified through manual inspection.

[0090] In this embodiment, in this scheme, the detection coefficient is obtained by combining the visual detection value and the instrument detection value, and then the preset threshold of the detection coefficient is compared with the 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, which is further beneficial 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 the qualification of the detection product is judged through manual inspection, which is beneficial to avoid the omission of suspicious detection products, and the detection results of difficult-to-identify detection products are finalized through manual inspection.

[0091] You can lock the module by product, specifically:

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

[0093] Step 2: Test the suspicious product twice through the visual inspection module and the instrument inspection module, and feedback the suspicious product information and re-inspection results to the management personnel.

[0094] In this embodiment, in this scheme, the production line of unqualified inspected products is locked through the suspicious product locking module. Since there is a great possibility that batches of unqualified products will appear in the subsequent pasting process due to equipment reasons after the polarizer is unqualified during pasting of the equipment, the inspected products can be marked and re-inspected through the suspicious product locking module, which is further beneficial to improve 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 reduce 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 taken picture and compare it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified;

[0097] Step 2: Obtain the transmittance of the glass substrate after the polarizer is attached by a transmittance detector and judge whether the test product is qualified. Obtain the polarization of the glass substrate after the polarizer is attached by a polarization detector and judge whether the test product is qualified. Obtain the instrument detection value through the transmittance and polarization;

[0098] Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients through visual inspection values ​​and instrument inspection values, set a preset threshold value for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold value 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 may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware, or in 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 separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope 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 pictures of the glass substrate after the polarizer is pasted, extracts the contrast of the taken pictures and compares them with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified; The instrument detection module obtains the transmittance of the glass substrate after the polarizer is attached through a transmittance detector and determines whether the test product is qualified. The polarization of the glass substrate after the polarizer is attached through a polarization detector and determines whether the test product is qualified. The instrument detection value is obtained through the transmittance and polarization; The test result confirmation module obtains the visual test value, obtains the instrument test value, obtains the test coefficient through the visual test value and the instrument test value, sets the test coefficient preset threshold, and determines whether the polarizer is pasted properly by comparing the test coefficient with the test coefficient preset threshold; The suspicious product locking module obtains the production information of the glass substrate with unqualified polarizer pasting, locks the suspicious product through the production information of the glass substrate with unqualified polarizer pasting, and conducts a second re-inspection on the suspicious product.

2. A 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 multi-angle pictures of the ten samples to obtain ten groups 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, and the contrast of the ten groups of grayscale processed photos is summed and averaged to obtain the mean contrast 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, establish 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 qualified pasting database to establish a qualified pasting database.

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

4. The liquid crystal display module testing system according to claim 1, characterized in that: In the instrument detection module, the transmittance of the glass substrate after the polarizer is attached is obtained through the transmittance detector to determine whether the test product is qualified, specifically: Step 1: Place ten qualified glass substrates in a transmittance tester to obtain ten transmittance reference values, and place ten qualified samples of glass substrates with polarizers attached in a transmittance tester to obtain ten transmittance values; Step 2: respectively taking the quotients of the ten light transmittance reference values ​​and their corresponding ten light transmittance values ​​to obtain ten reference light transmittances, arranging the ten reference light transmittances from small to large, taking the smallest one of the reference light transmittances as the minimum reference light transmittance, taking the largest one of the reference light transmittances as the maximum reference light transmittance, and obtaining the light transmittance qualified range through the minimum reference light transmittance and the maximum reference light 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 whether the test product is qualified is determined, specifically: Step 1: prepare ten qualified samples of equal area, divide the area of ​​the ten qualified samples into nine equal parts, put 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, take the smallest one of the ten reference polarization degree means as the minimum reference polarization degree mean, take the largest one of the ten reference polarization degree means as the maximum reference polarization degree mean, and obtain the reference polarization degree mean interval through the minimum reference polarization degree mean and the maximum reference polarization degree mean; Step 3: Divide the area of ​​the test object into nine equal parts, and place each divided area of ​​the test object into a polarization detector to obtain nine detected polarization degrees, and determine whether the nine detected polarization degrees are within the reference polarization mean range. If the nine detected polarization degrees are all 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 the nine detected polarization degrees are not all within the reference polarization range, the test object 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: Among them, Yz represents the instrument detection value, Tv represents the transmittance, Pv represents the polarization rate, θ1 and θ2 are 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 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, and whether the polarizer is pasted properly is determined by comparing the detection coefficient with the preset threshold value of the detection coefficient, specifically: Step 1: Set a preset threshold value for the detection coefficient, obtain the detection coefficient of the detection product, compare the preset threshold value for the detection coefficient with the detection coefficient, if the detection coefficient is less than the preset threshold value for the detection coefficient, mark the detection product as unqualified, if the detection coefficient is greater than the preset threshold value for the detection coefficient, mark the detection product as provisionally qualified; Step 2: Obtain the qualified visual inspection results of the provisionally qualified test products, and obtain the qualified 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 to determine whether the test products are qualified through manual inspection.

9. The liquid crystal display module testing system according to claim 1, characterized in that: You can lock the module by product, specifically: Step 1: Obtain the pasting equipment information of the unqualified test products, obtain the pasting processing time of the unqualified test products, capture all the test products of the unqualified test product pasting equipment after the unqualified test product pasting processing time, and mark them as suspicious products; Step 2: Test the suspicious product twice through the visual inspection module and the instrument inspection module, and feedback the suspicious product information and re-inspection results to the management personnel.

10. A liquid crystal display module testing method, applied to a liquid crystal display module testing system as claimed in any one of claims 1 to 9, 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 taken picture and compare it with the qualified pasting database to obtain the visual inspection value and judge whether the inspected product is qualified; Step 2: Obtain the transmittance of the glass substrate after the polarizer is attached by a transmittance detector and judge whether the test product is qualified. Obtain the polarization of the glass substrate after the polarizer is attached by a polarization detector and judge whether the test product is qualified. Obtain the instrument detection value through the transmittance and polarization; Step 3: Obtain visual inspection values, obtain instrument inspection values, obtain inspection coefficients through visual inspection values ​​and instrument inspection values, set a preset threshold value for the inspection coefficient, and determine whether the polarizer is properly pasted by comparing the inspection coefficient with the preset threshold value 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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