LCD (Liquid Crystal Display) surface mounting detection device and surface mounting detection method

Abstract

The invention relates to the technical field of LCD screen detection, in particular to an LCD surface mounting detection device and method, and the device comprises an AOI detection platform which is used for carrying out the optical detection of an LCD screen; the detection analysis module is used for analyzing the obtained optical detection result; the sorting module is used for sorting the LCD screens to different conveying belts according to the analysis result of the detection and analysis module; the chip mounting platform is used for carrying out chip mounting on the LCD screens meeting the chip mounting requirements; and the moving module can move the LCD screens which are sorted by the sorting module and meet the surface mounting requirements to a surface mounting platform. The AOI detection platform and the surface mounting platform are arranged adjacently, so that transmission between different procedures is reduced, the production stability is guaranteed, and the qualified rate of products is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of LCD screen detection, and in particular to an LCD detection patch device and a detection patch method. Background Art

[0002] With the rapid development of science and technology, electronic devices have been deeply integrated into all aspects of people's lives, from smartphones, tablets to laptops, car displays, etc. Liquid crystal displays (LCDs) are key components of these devices, and their market demand has shown a sustained explosive growth. The acceleration of the global digitalization process and the rise of emerging technology fields such as the Internet of Things and artificial intelligence have further broadened the application scenarios of LCDs, prompting various industries to put forward more stringent requirements on the performance, quality and production efficiency of LCDs. In this context, traditional LCD testing and patching methods can no longer meet the growing industrial needs. On the one hand, the trend of large-scale production requires a higher degree of automation and faster production speed in the production process; on the other hand, consumers' high requirements for the display effects of electronic products require that the production of LCDs must ensure higher precision and quality stability.

[0003] AOI (Automated Optical Inspection) inspection platform, that is, automatic optical inspection platform, is a device that uses high-precision cameras and image processing technology to automatically inspect products based on optical principles. The working principle of AOI inspection platform is mainly to obtain image information of products through cameras, and then use specific image processing algorithms to analyze and compare these images, match the actual images with pre-set standard images or models, and thus determine whether the product has defects and the type and location of the defects. It has a fast inspection speed and can meet the needs of online inspection for large-scale and high-speed production; it has high inspection accuracy and can detect tiny defects, providing a strong guarantee for the high-quality production of electronic products.

[0004] Chinese Patent Publication No.: CN107144992A discloses a fully automated LCD inspection control system and method based on AOI technology, the system includes an Inline line body PLC control module and an inspection workstation, the inspection workstation is provided with an automatic crimping device and an AOI system; the Inline line body PLC control module is used to control the position of the LCD panel on the assembly line; the automatic crimping device is used to control the motor to automatically insert and crimp the LCD panel entering the inspection workstation, after completion, notify the AOI system to start inspection, and automatically unplug the LCD panel after receiving the completion inspection signal sent by the AOI system; the AOI system is used to perform automatic optical inspection on the LCD panel after receiving the start inspection signal, generate an inspection information file, and send a completion inspection signal to the automatic crimping device.

[0005] In the current LCD inspection field, AOI testing and polarizer attachment are usually two independent devices. Multiple product transfers are required between the two processes, which may cause damage to the product and lead to unstable product quality. Summary of the invention

[0006] To this end, the present invention provides an LCD patch detection device and a patch detection method to overcome the problem that AOI testing and polarizer attachment in the current LCD detection field in the prior art are usually two independent devices, and multiple product transfers are required between the two processes, which may cause damage to the product and lead to unstable product quality.

[0007] To achieve the above purpose, an LCD detection patch device includes: AOI inspection platform, used for optical inspection of LCD screens, including bright spot inspection and timing inspection; A detection and analysis module, which is connected to the AOI detection platform, and is used to analyze the obtained optical detection results, determine whether the LCD screen meets the first patch requirement through the data of the bright spot detection, determine whether the LCD screen meets the second patch requirement through the data of the timing detection, and adjust the determination standard of the second patch requirement through the data of the bright spot detection; A sorting module, which sorts the LCD screens onto different conveyor belts according to the analysis results of the detection and analysis module; A patch platform, which is used to perform patching on an LCD screen that meets the second patching requirement; A moving module, which can move the LCD screens that meet the patch requirements after being sorted by the sorting module to the patch platform; When analyzing the internal characteristic detection information, the detection and analysis module divides the LCD screen into areas and compares the brightness of each area to determine the conveyor belt for sorting the LCD screen.

[0008] Furthermore, the AOI inspection platform can perform appearance inspection and internal characteristic inspection on the LCD screen, wherein: The appearance inspection is to obtain image information of the LCD screen and analyze defects, cracks, and stains; The internal characteristic detection includes bright spot detection and timing detection of the LCD screen.

[0009] Furthermore, the appearance detection can be performed synchronously with the bright spot detection.

[0010] Furthermore, the AOI inspection platform adjusts the background of the LCD screen and acquires the image information of the adjusted LCD screen, including acquiring appearance inspection information and bright spot inspection information; The detection and analysis module analyzes the appearance detection information, and according to the analysis result, controls the sorting module to move the LCD screen to the rework conveyor belt, or controls the sorting module to move the LCD screen to the defective conveyor belt, or analyzes the bright spot detection information.

[0011] Furthermore, the data of the bright spot detection includes the brightness of each area after the area division, and the detection and analysis module determines whether the brightness of each area is qualified according to the difference between each brightness and the standard brightness.

[0012] Furthermore, the detection and analysis module sorts the divided regions according to the brightness conditions, and determines whether the brightness values ​​at both ends are within a preset brightness range, so as to determine whether the LCD screen meets the first patch requirement.

[0013] Furthermore, if the brightness values ​​at both ends are not within the preset brightness range, the detection and analysis module determines the sorting conveyor belt of the LCD screen according to the number of areas with unqualified brightness and the brightness difference of the areas with unqualified brightness; In the process of sorting conveyor belt of LCD screen, the number of areas with unqualified brightness and the brightness difference of unqualified areas are used to judge. For the case where both brightness values ​​at the two ends are not within the preset brightness range and for the case where one of the brightness values ​​at the two ends is not within the preset brightness range, the evaluation method of the determination process is different.

[0014] Furthermore, when the LCD screen meets the first patch requirement, the AOI detection platform performs timing detection on the LCD screen, including horizontal timing detection and vertical timing detection; The AOI inspection platform sequentially lights up the divided LCD screen areas according to a preset order, and obtains the lighting interval duration between adjacent areas; The detection and analysis module compares the interval durations collected by the AOI detection platform with the standard interval durations one by one, and summarizes the interval durations collected that are greater than the standard interval durations to determine whether the LCD screen meets the second patch requirements; In the aggregation process, a calculation compensation value is set for any collection interval duration, and the value of the calculation compensation value is positively correlated with the corresponding collection interval duration.

[0015] Furthermore, for LCD screens that meet the first patch requirement, the detection and analysis module calculates the sum of the brightness deviation values ​​of all divided areas, and adjusts whether it meets the second patch requirement based on the calculation result. The larger the calculated value is, the stricter the judgment on the result of the summary is.

[0016] The present invention also provides an LCD patch detection method, which is implemented based on the above-mentioned LCD patch detection device, and comprises: Place the LCD screen to be mounted on the AOI inspection platform, and the AOI inspection platform adjusts the background color of the LCD screen; The AOI inspection platform divides the LCD screen to be inspected into regions according to the plane rectangular coordinate system; The AOI inspection platform obtains the appearance inspection information of the LCD screen under a single background and determines whether the LCD screen has appearance defects. The sorting module sorts the LCD screen to the designated conveyor belt according to the existing appearance defects. The AOI inspection platform obtains the overall screen image information and the bright spot image information of the LCD screen under a single background, and the inspection and analysis module determines whether the LCD screen meets the first patch requirement based on the obtained overall screen image information and the bright spot image information; For those that meet the first patch requirements, the AOI inspection platform performs timing inspection on the LCD screen to determine whether the LCD screen meets the second patch requirements; The detection and analysis module sends instructions to the sorting module based on the judgment results to sort the LCD screens onto different conveyor belts; The moving module moves the LCD screen on the patch conveyor belt to the patch platform for patching.

[0017] Compared with the prior art, the beneficial effect of the present invention is that, by arranging the AOI inspection platform and the patch platform adjacently, the transmission between different processes is reduced, the stability of production is ensured, and the qualified rate of products is increased.

[0018] Furthermore, by acquiring appearance information and acquiring internal characteristic detection information, the integrity of the detection data is guaranteed by detecting them separately, and data detection can be performed from multiple aspects to ensure that the overall data of the LCD screen is qualified.

[0019] Furthermore, by performing appearance detection and bright spot detection simultaneously, the detection time is shortened and the detection rate is increased.

[0020] Furthermore, by dividing the LCD screen to be tested into areas, the quality information of each point on the LCD screen can be clearly obtained. At the same time, for products that need to be reworked, the areas with problems can be quickly obtained, which speeds up the rework, improves production efficiency, and ensures the quality of the final product.

[0021] Furthermore, by first inspecting the appearance, the time for subsequent inspections can be shortened, because problems with internal information may be able to be adjusted, but cracks and damage cannot be reversed, so appearance data analysis is performed first to speed up the overall production speed. At the same time, different responses are taken for different appearance defects. For those with stains, the stains may be removed and therefore they are reworked, ensuring the product yield.

[0022] Furthermore, by setting up a rework conveyor belt, the polarized selection and judgment method of qualified and unqualified in the traditional process is eliminated. For products that have a chance of rework, they are transported through the rework conveyor belt, which reduces the defective rate of products and ensures the finished product rate.

[0023] Furthermore, by first analyzing the overall brightness and chromaticity, an overall evaluation is performed, and then each divided area is evaluated, a reasonable evaluation sequence is set, and the overall production process is accelerated.

[0024] Furthermore, by determining whether there are points with unqualified brightness, the patch requirements for the LCD screen are determined, ensuring the patch yield.

[0025] Furthermore, if there are many unqualified areas, the difficulty of regulation increases. Therefore, when the number of unqualified areas is small, the unqualified situation is evaluated based on the brightness data alone. When the number of unqualified areas is large, the LCD screen is directly determined to be transferred to the defective conveyor belt. When the number of unqualified areas is between the two, the unqualified situation is comprehensively considered to ensure the accuracy of the calculated data while considering the difficulty of regulation. Through comprehensive assessment, it is ensured that the LCD screen is produced quickly and well.

[0026] Furthermore, for unqualified areas, if the overall unqualified brightness is too large or too small, it means that the brightness deviation is concentrated and the adjustment is easy; if the unqualified brightness is both too large and too small, it means that the brightness deviation is dispersed and the adjustment is difficult. Therefore, the numerical value of the evaluation value of the number of areas with unqualified brightness is determined by the dispersion of brightness to ensure the rationality of the overall calculation. Through comprehensive assessment, the LCD screen production is guaranteed to be fast and good.

[0027] Furthermore, by performing timing detection, the reaction time of receiving signals at each area point can be obtained, so that the quality of the detected LCD screen can be judged, ensuring the quality of the produced LCD.

[0028] Furthermore, for areas where there are time difference deviations, if the time difference value is larger, it means that the wake-up time of the corresponding area point is longer and the existing problem is larger. Therefore, when the time difference is larger, the compensation value calculated by the time difference deviation value is larger, and when the time difference value is greater than the safety value, the result can be adjusted by calculating the compensation value by the time difference deviation value, and the LCD screen is directly output as unqualified.

[0029] Furthermore, by adjusting the timing detection through the brightness detection results, the quality of the LCD screen can be controlled as a whole, making the evaluation relevant and ensuring the quality stability of the output finished LCD screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the LCD detection patch device in the embodiment; Figure 2 A schematic diagram of the regional distribution of the LCD screen area in the embodiment; Figure 3 Schematic diagram of the detection process under a single background condition in the embodiment; Figure 4 Schematic diagram of the process of LCD detection patch method in the embodiment. DETAILED DESCRIPTION

[0031] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figure 1 As shown, Figure 1 It is a structural schematic diagram of the LCD detection patch device in the embodiment; The present invention provides an LCD detection patch device, comprising AOI inspection platform 1, used for optical inspection of LCD screens; A detection and analysis module, which is connected to the AOI detection platform, and is used to analyze the obtained optical detection results, determine whether the LCD screen meets the first patch requirement through the data of the bright spot detection, determine whether the LCD screen meets the second patch requirement through the data of the timing detection, and adjust the determination standard of the second patch requirement through the data of the bright spot detection; A sorting module 2, sorting the LCD screens onto different conveyor belts according to the analysis results of the detection and analysis module; The patch platform 3 is used to perform patching on the LCD screen that meets the patching requirements; A moving module 4, which can move the LCD screens that meet the patch requirements after being sorted by the sorting module to the patch platform; When analyzing the internal characteristic detection information, the detection and analysis module divides the LCD screen into areas and compares the brightness of each area to determine the conveyor belt for sorting the LCD screen.

[0036] The different conveyor belts include a rework conveyor belt 51 , a defective product conveyor belt 52 , and a patch conveyor belt 53 .

[0037] By placing the AOI inspection platform and the placement platform adjacent to each other, the transmission between different processes is reduced, the stability of production is guaranteed, and the qualified rate of products is increased.

[0038] The AOI inspection platform can perform appearance inspection and internal characteristic inspection on LCD screens, wherein: The appearance inspection is to obtain image information of the LCD screen and analyze defects, cracks, and stains; The internal characteristic detection includes bright spot detection and timing detection of the LCD screen.

[0039] By acquiring appearance information and internal characteristic detection information, the integrity of the detection data is guaranteed through separate detection. Data detection can be performed from multiple aspects to ensure that the overall data of the LCD screen is qualified.

[0040] The appearance detection can be performed simultaneously with the bright spot detection.

[0041] By performing appearance inspection and bright spot inspection simultaneously, the inspection time can be shortened and the inspection rate can be increased.

[0042] See also Figure 3 , Figure 3 Schematic diagram of the detection process under single background conditions in the embodiment.

[0043] The AOI inspection platform divides the LCD screen to be inspected into regions according to a plane rectangular coordinate system. The distribution of the divided regions is shown in the attached figure. Figure 2 , Figure 2 Schematic diagram of the area distribution of the LCD screen area division in the embodiment.

[0044] By dividing the LCD screen to be tested into areas, the quality information of each point on the LCD screen can be clearly obtained. At the same time, for products that need to be reworked, the areas with problems can be quickly obtained, which speeds up the rework, improves production efficiency, and ensures the quality of the final product.

[0045] Specifically, the AOI inspection platform adjusts the LCD screen to a single background and performs appearance inspection on the LCD screen under the single background. Determine whether the LCD screen has cracks. If there are cracks, the sorting module transfers the LCD screen to the defective conveyor belt; if there are no cracks, the AOI inspection platform continues to perform appearance inspection on the LCD screen.

[0046] Detect edge defects of the LCD screen. If there are edge defects, analyze each existing defect area to obtain the area of ​​each defect. The detection and analysis module is provided with a standard defect area. The detection and analysis module calculates the total defect area detected and compares the total defect area with the standard defect area. If the total defect area is larger than the standard defect area, the sorting module moves the LCD screen to the defective conveyor belt.

[0047] Specifically, the stain condition of the LCD screen is detected, and if there is stain, the sorting module moves the LCD screen to the rework conveyor belt.

[0048] By testing the appearance first, the time for subsequent testing can be shortened, because problems with internal information may be able to be adjusted, but cracks and damage cannot be reversed, so appearance data analysis is performed first to speed up the overall production speed. At the same time, different responses are taken for different appearance defects. For stains, the stains may be removed and therefore reworked, ensuring the product yield.

[0049] By setting up a rework conveyor belt, the polarized selection and judgment method of qualified and unqualified products in the traditional process is eliminated. For products that have a chance of rework, they are transported through the rework conveyor belt, which reduces the defective rate of products and ensures the finished product rate.

[0050] Specifically, the AOI inspection platform adjusts the LCD screen to a single background, and obtains the overall image information and bright spot image information of the LCD screen under the single background condition, wherein: The overall image information of the LCD screen includes the image chromaticity and image brightness of the LCD screen against a single background; The bright spot image information includes determining the individual brightness of each area according to the divided areas.

[0051] Specifically, the detection and analysis module performs a primary analysis based on the acquired overall image information of the LCD screen and obtains a primary result report; The detection and analysis module is provided with standard image chromaticity information and standard image brightness information. The detection and analysis module compares the acquired image chromaticity and image brightness of the LCD screen under a single background with the internally set standard image chromaticity information and standard image brightness information to determine whether the detection of the LCD screen under a single background is qualified.

[0052] Specifically, the comparison process includes: The chromaticity of the collected image is calculated to be different from the chromaticity of the preset standard image, and the absolute value of the chromaticity difference is obtained. The absolute value of the chromaticity difference obtained is compared with the preset chromaticity difference threshold. If the absolute value of the chromaticity difference is within the preset chromaticity difference threshold, the chromaticity of the image under the single background is determined to be qualified. The brightness of the captured image is calculated to be different from the brightness of the preset standard image, and the absolute value of the brightness difference is obtained. The absolute value of the brightness difference is compared with the preset brightness difference threshold. If the absolute value of the brightness difference is within the preset brightness difference threshold, the brightness of the image under the single background is determined to be qualified. When it is determined that the image chromaticity and the image brightness under the single background are both qualified, the detection and analysis module determines that the overall image information of the LCD screen under the single background is qualified.

[0053] When it is determined that the image chromaticity and image brightness under a single background are unqualified, the sorting module transfers the LCD screen to the defective conveyor belt.

[0054] By first analyzing the overall brightness and chromaticity, conducting an overall evaluation, and then evaluating each divided area, a reasonable evaluation sequence is set to speed up the overall production process.

[0055] Specifically, after determining that the overall image information of the LCD screen under a single background is qualified, the detection and analysis module analyzes the bright spot image information, obtains the brightness value of the individual brightness of each area, and sorts the coordinate numbers of the areas in order from low to high. The detection and analysis module compares the brightness value of the area corresponding to the coordinate number with the lowest brightness and the brightness value of the area corresponding to the coordinate number with the highest brightness with the preset standard image brightness respectively. If the difference between the brightness value of the area corresponding to the coordinate number with the lowest brightness and the preset standard image brightness is within the preset brightness difference threshold range, and the difference between the brightness value of the area corresponding to the coordinate number with the highest brightness and the preset standard image brightness is within the preset brightness difference threshold range, the detection and analysis module determines that the bright spot image information of the LCD screen is qualified and the LCD screen meets the first patch requirement.

[0056] Specifically, if the difference between the brightness value of the area corresponding to the coordinate number with the lowest brightness and the preset standard image brightness is not within the preset brightness difference threshold range, or the difference between the brightness value of the area corresponding to the coordinate number with the highest brightness and the preset standard image brightness is not within the preset brightness difference threshold range, the detection and analysis module determines that the bright spot image information of the LCD screen is unqualified and the LCD screen does not meet the first patch requirement.

[0057] Specifically, for LCD screens that meet the first patch requirements, The detection and analysis module calculates the sum R of the brightness deviation values ​​of all divided areas. , is the detected brightness value of any area, and Az is the standard image brightness.

[0058] In this embodiment, the standard image brightness is set to 200 nits, and the brightness difference threshold range is 5 nits.

[0059] Specifically, for LCD screens that meet the first patch requirements, the AOI inspection platform performs timing inspection on them. The timing inspection includes horizontal timing inspection and vertical timing inspection. In particular, when performing horizontal timing detection, the AOI detection platform performs timing detection on each row in order from bottom to top. When performing timing detection on any row, the areas of the detection row are illuminated from left to right in sequence. For any area that is not at the end of the row, when the area is obtained to be illuminated, the AOI detection platform performs timing timing. After reaching the preset timing duration, the AOI detection platform sends a lighting instruction to the next area; the AOI detection platform obtains the lighting interval duration between adjacent areas, and numbers them, setting the interval duration between area number (1,1) and area number (1,2) to t111, the interval duration between area number (1,2) and area number (1,3) to t112, ..., the interval duration between area number (2,1) and area number (2,2) to t121, the interval duration between area number (2,2) and area number (2,3) to t122, and the remaining numbers are similar.

[0060] In particular, when performing longitudinal timing detection, the AOI detection platform performs timing detection on each row from left to right. When performing timing detection on any column, the areas of the detection row are lit up in sequence from bottom to top. For any area that is not at the end of the column, when the area is obtained to be lit, the AOI detection platform performs timing timing. After reaching the preset timing duration, the AOI detection platform sends a lighting instruction to the next area. The AOI detection platform obtains the lighting interval duration between adjacent areas, and numbers them, setting the interval duration between area numbered (1,1) and area numbered (2,1) to t211, the interval duration between area numbered (2,1) and area numbered (3,1) to t212, ..., the interval duration between area numbered (1,2) and area numbered (2,2) to t221, the interval duration between area numbered (2,2) and area numbered (3,2) to t222, and the remaining numbers are similar.

[0061] Specifically, the detection and analysis module analyzes the interval durations in turn, and the detection and analysis module is provided with a standard interval duration; Specifically, the detection and analysis module compares the interval durations collected by the AOI detection platform with the standard interval durations one by one. For interval durations longer than the standard interval durations, the detection and analysis module calculates the difference between the collected interval durations and the standard interval durations, and numbers and counts the interval durations longer than the standard interval durations. It is assumed that there are a total of H collected interval durations that are greater than the standard interval duration. The detection and analysis module labels the difference between the collected interval durations and the standard interval durations, and records them as the first duration excess difference value T1, the second duration excess difference value T2,..., the Hth duration excess difference value Th.

[0062] The detection and analysis module calculates the time difference evaluation parameter C, setting: , Wherein, Zj is the calculated compensation value of the jth duration excess difference value Tj for the duration excess difference value evaluation parameter, and the detection and analysis module is provided with a first standard duration excess difference value evaluation value C1 and a second standard duration excess difference value evaluation value C2; If C≤C1, the detection and analysis module determines that the detected LCD screen meets the second patch requirement; If C1<C≤C2, the detection and analysis module sends an instruction to the sorting module, and the sorting module moves the LCD screen to the rework conveyor belt; If C>C2, the detection and analysis module sends an instruction to the sorting module, and the sorting module moves the LCD screen to the defective product conveyor belt.

[0063] The detection and analysis module sends instructions to the sorting module for the screens that meet the second patch requirements, and the sorting module moves the LCD screens to the patch conveyor belt.

[0064] Specifically, by performing timing detection, the reaction time of receiving signals at each area point can be obtained, so that the quality of the tested LCD screen can be judged, ensuring the quality of the produced LCD.

[0065] For different durations, the values ​​of the compensation values ​​Zj are different. Tj≤Tb1, then Zj=Zb1; Tb1<Tj≤Tb2, then Zj=Zb2; Tj>Tb2, then Zj=Zb3.

[0066] Among them, Tb1 is the first segment evaluation value of the duration excess difference, Tb2 is the second segment evaluation value of the duration excess difference; Zb1 is the first preset duration excess difference calculation compensation value, Zb2 is the second preset duration excess difference calculation compensation value, Zb3 is the third preset duration excess difference calculation compensation value, Zb<Zb2<Zb3.

[0067] For areas where there are time difference deviations, if the time difference value is larger, it means that the wake-up time of the corresponding area point is longer and the existing problem is larger. Therefore, when the time difference is larger, the compensation value calculated by the time difference deviation value is larger, and when the time difference value is larger than the safety value, the result can be adjusted by calculating the compensation value by the time difference deviation value, and the LCD screen is directly output as unqualified.

[0068] Set, C1=G1×M, C2=G2×M, where G1 is the basic value of the first standard duration excess difference evaluation value, G2 is the basic value of the second standard duration excess difference evaluation value, and M is the calculated adjustment value of the screen brightness difference to the duration excess difference evaluation value.

[0069] R≤R1, then M=1; R1<R≤R2, then M=0.9; R>R2, then M=0.85.

[0070] R1 is the sum of the brightness deviation values ​​of all regions and the first evaluation value, and R2 is the sum of the brightness deviation values ​​of all regions and the second evaluation value.

[0071] In this embodiment, it is set that the standard interval duration is 0.1s, Tb1=0.02s, Tb2=0.05s, Zb1=5, Zb2=10, Zb3=20, G1=0.5s, G2=1s, R1=5nits, R2=9nits.

[0072] By adjusting the timing detection through the brightness detection results, the quality of the LCD screen can be controlled as a whole, making the evaluation relevant and ensuring the quality stability of the output finished LCD screen.

[0073] For the LCD screen whose bright spot image information is determined to be unqualified, the detection and analysis module determines the sorting conveyor belt of the LCD screen according to the number of areas with unqualified brightness and the brightness difference of the areas with unqualified brightness.

[0074] By determining whether there are points with unqualified brightness, the patch requirements for the LCD screen are determined, ensuring the patch yield.

[0075] For the determination that the bright spot image information of the LCD screen is unqualified, the detection and analysis module sequentially calculates the difference between the brightness value of different areas and the preset standard image brightness, and determines whether they are within the brightness difference threshold range one by one; the detection and analysis module renumbers the areas where the difference is not within the preset brightness difference threshold range, and records them as the first brightness unqualified area, the second brightness unqualified area, ..., the dth brightness unqualified area, where d is the number of areas with unqualified brightness; The difference in brightness of the first unqualified brightness area is A1, the difference in brightness of the second unqualified brightness area is A2, ..., and the difference in brightness of the dth unqualified brightness area is Ad; The detection and analysis module calculates the regional brightness unqualified evaluation parameter F and sets it. , Wherein, B is the calculated adjustment value of the regional brightness unqualified evaluation parameter for the number of regions with unqualified brightness; The detection and analysis module is set with an unqualified standard value F0 for regional brightness. If F≤F0, the sorting module moves the LCD screen to the rework conveyor belt; If F>F0, the sorting module moves the LCD screen to the defective conveyor belt.

[0076] For areas with unqualified brightness, the unqualified situations are quantitatively assessed and divided according to the assessment results to ensure the standardization of data evaluation. For areas with unqualified brightness, larger evaluation parameters indicate that it is more difficult to adjust the screen, so it is sent to the defective product conveyor belt. For areas with smaller data, it means that it is less difficult to adjust the screen and there is a certain probability that the screen data will become normal, so it is sent to the rework conveyor belt.

[0077] The value of the regional brightness unqualified standard value F0 is 3 times the preset brightness difference threshold range value.

[0078] The value of the calculated adjustment value B is related to the number of d, set, d≤N1,B=0; N1<d≤N2, B=0.2P; d>N2,B=P; N1 is a first evaluation value of the number of areas with unqualified brightness, N2 is a second evaluation value of the number of areas with unqualified brightness, and P is 5 times of a preset brightness difference threshold range value.

[0079] If there are many unqualified areas, the difficulty of regulation will increase. Therefore, when the number of unqualified areas is small, the unqualified situation is evaluated based on the brightness data alone. When the number of unqualified areas is large, the LCD screen is directly determined to be transferred to the defective conveyor belt. When the number of unqualified areas is between the two, the unqualified situation is comprehensively considered to ensure the accuracy of the calculated data while considering the difficulty of regulation. Through comprehensive assessment, it is guaranteed that the LCD screen is produced quickly and well.

[0080] Specifically, the values ​​of the first evaluation value of the number of regions with unqualified brightness and the second evaluation value of the number of regions with unqualified brightness are respectively related to the distribution of regions with unqualified brightness; Specifically, if the difference between the brightness value of the area corresponding to the coordinate number with the lowest brightness and the preset standard image brightness is within the preset brightness difference threshold range, or the difference between the brightness value of the area corresponding to the coordinate number with the highest brightness and the preset standard image brightness is within the preset brightness difference threshold range, Then the first evaluation value of the number of areas with unqualified brightness is 4; The second evaluation value of the number of areas with unqualified brightness is 6.

[0081] Specifically, if the difference between the brightness value of the area corresponding to the coordinate number with the lowest brightness and the preset standard image brightness is not within the preset brightness difference threshold range, and the difference between the brightness value of the area corresponding to the coordinate number with the highest brightness and the preset standard image brightness is not within the preset brightness difference threshold range, Then the first evaluation value of the number of areas with unqualified brightness is 3; The second evaluation value of the number of areas with unqualified brightness is 5.

[0082] For unqualified areas, if the overall unqualified brightness is too large or too small, it means that the brightness deviation is concentrated and the adjustment is easy; if the unqualified brightness is both too large and too small, it means that the brightness deviation is dispersed and the adjustment is difficult. Therefore, the numerical value of the evaluation value of the number of areas with unqualified brightness is determined by the dispersion of brightness to ensure the rationality of the overall calculation. Through comprehensive assessment, the LCD screen production is guaranteed to be fast and good.

[0083] Specifically, the moving module moves the LCD screen on the patch conveyor belt to the patch platform for patching.

[0084] See also Figure 4 , Figure 4 Schematic diagram of the process of LCD detection patch method in the embodiment.

[0085] The present invention also provides an LCD patch detection method, which is implemented based on the above-mentioned LCD patch detection device, and comprises: S1, placing the LCD screen to be mounted on the AOI inspection platform, and the AOI inspection platform adjusts the background color of the LCD screen; S2, the AOI inspection platform divides the LCD screen to be inspected into regions according to the plane rectangular coordinate system; S3, the AOI inspection platform obtains the appearance inspection information of the LCD screen under a single background, determines whether the LCD screen has appearance defects, and the sorting module sorts the LCD screen to the designated conveyor belt according to the existing appearance defects; S4, the AOI detection platform obtains the overall screen image information and the bright spot image information of the LCD screen under a single background, and the detection and analysis module determines whether the LCD screen meets the first patch requirement based on the obtained overall screen image information and the bright spot image information; S5, for those that meet the first patch requirement, the AOI inspection platform performs a timing inspection on the LCD screen to determine whether the LCD screen meets the second patch requirement; S6, the detection and analysis module sends instructions to the sorting module according to the determination result, and sorts the LCD screens onto different conveyor belts; S7, the mobile module moves the LCD screen on the patch conveyor belt to the patch platform for patching.

[0086] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An LCD detection patch device, characterized in that: include AOI inspection platform, used for optical inspection of LCD screens, including bright spot inspection and timing inspection; A detection and analysis module, which is connected to the AOI detection platform, and is used to analyze the obtained optical detection results, determine whether the LCD screen meets the first patch requirement through the data of the bright spot detection, determine whether the LCD screen meets the second patch requirement through the data of the timing detection, and adjust the determination standard of the second patch requirement through the data of the bright spot detection; A sorting module, which sorts the LCD screens onto different conveyor belts according to the analysis results of the detection and analysis module; A patch platform, which is used to perform patching on an LCD screen that meets the second patching requirement; A moving module, which can move the LCD screens that meet the patch requirements after being sorted by the sorting module to the patch platform; When analyzing the internal characteristic detection information, the detection and analysis module divides the LCD screen into areas and compares the brightness of each area to determine the conveyor belt for sorting the LCD screen.

2. The LCD detection patch device according to claim 1, characterized in that: The AOI inspection platform can perform appearance inspection and internal characteristic inspection on LCD screens, wherein: The appearance inspection is to obtain image information of the LCD screen and analyze defects, cracks, and stains; The internal characteristic detection includes bright spot detection and timing detection of the LCD screen.

3. The LCD detection patch device according to claim 2, characterized in that: The appearance detection can be performed simultaneously with the bright spot detection.

4. The LCD detection patch device according to claim 2, characterized in that: The AOI inspection platform adjusts the background of the LCD screen and obtains the adjusted LCD screen image information, including obtaining appearance inspection information and bright spot inspection information; The detection and analysis module analyzes the appearance detection information, and according to the analysis result, controls the sorting module to move the LCD screen to the rework conveyor belt, or controls the sorting module to move the LCD screen to the defective conveyor belt, or analyzes the bright spot detection information.

5. The LCD detection patch device according to claim 1, characterized in that: The data of the bright spot detection includes the brightness of each area after the area division, and the detection and analysis module determines the brightness qualification of each area according to the difference between each brightness and the standard brightness.

6. The LCD detection patch device according to claim 5, characterized in that: The detection and analysis module sorts the divided regions according to the brightness conditions, and determines whether the brightness values ​​at both ends are within a preset brightness range, so as to determine whether the LCD screen meets the first patch requirement.

7. The LCD detection patch device according to claim 6, characterized in that: If the brightness values ​​at both ends are not within the preset brightness range, the detection and analysis module determines the sorting conveyor belt of the LCD screen according to the number of areas with unqualified brightness and the brightness difference of the areas with unqualified brightness; In the process of sorting conveyor belt of LCD screen, the number of areas with unqualified brightness and the brightness difference of unqualified areas are used to judge. For the case where both brightness values ​​at the two ends are not within the preset brightness range and for the case where one of the brightness values ​​at the two ends is not within the preset brightness range, the evaluation method of the determination process is different.

8. The LCD detection patch device according to claim 1, characterized in that: When the LCD screen meets the first patch requirement, the AOI detection platform performs timing detection on the LCD screen, including horizontal timing detection and vertical timing detection; The AOI inspection platform sequentially lights up the divided LCD screen areas according to a preset order, and obtains the lighting interval duration between adjacent areas; The detection and analysis module compares the interval durations collected by the AOI detection platform with the standard interval durations one by one, and summarizes the interval durations collected that are greater than the standard interval durations to determine whether the LCD screen meets the second patch requirements; In the aggregation process, a calculation compensation value is set for any collection interval duration, and the value of the calculation compensation value is positively correlated with the corresponding collection interval duration.

9. The LCD detection patch device according to claim 8, characterized in that: For LCD screens that meet the first patch requirements, the detection and analysis module calculates the sum of the brightness deviation values ​​of all divided areas, and adjusts whether it meets the second patch requirements based on the calculation results. The larger the calculated value is, the stricter the judgment on the result of the summary is.

10. An LCD patch detection method, implemented based on the LCD patch detection device according to any one of claims 1 to 9, characterized in that: include, Place the LCD screen to be mounted on the AOI inspection platform, and the AOI inspection platform adjusts the background color of the LCD screen; The AOI inspection platform divides the LCD screen to be inspected into regions according to the plane rectangular coordinate system; The AOI inspection platform obtains the appearance inspection information of the LCD screen under a single background and determines whether the LCD screen has appearance defects. The sorting module sorts the LCD screen to the designated conveyor belt according to the existing appearance defects. The AOI inspection platform obtains the overall screen image information and the bright spot image information of the LCD screen under a single background, and the inspection and analysis module determines whether the LCD screen meets the first patch requirement based on the obtained overall screen image information and the bright spot image information; For those that meet the first patch requirements, the AOI inspection platform performs timing inspection on the LCD screen to determine whether the LCD screen meets the second patch requirements; The detection and analysis module sends instructions to the sorting module based on the judgment results to sort the LCD screens onto different conveyor belts; The moving module moves the LCD screen on the patch conveyor belt to the patch platform for patching.

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