TFT (Thin Film Transistor) display screen laminating method and system

Abstract

The invention discloses a TFT display screen attaching method and system. The method comprises the steps that a first position value and a first posture value of the edge of an AA display area of a TFT display screen are obtained, and a second position value and a second posture value of the edge of a light guide plate of a backlight module are obtained; respectively obtaining a first position difference value, a first attitude difference value, a second position difference value and a second attitude difference value; respectively adjusting a first position value and a first attitude value of the TFT display screen according to the first position difference value, the first attitude difference value, the second position difference value and the second attitude difference value, and adjusting a second position value and a second attitude value of the backlight module according to the second position difference value and the second attitude difference value; fitting the TFT display screen and the backlight module by using the adjusted position value and posture value; the assembling and fitting precision of the TFT display screen and the backlight module is improved, waste of manpower, material resources and time efficiency is reduced, the requirements of current consumer markets are met, and the product competitiveness is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bonding of liquid crystal display panels, and in particular to a method and system for bonding a TFT display screen. Background Art

[0002] TFT display modules can be used in terminal products such as mobile phones, tablets, laptops or general computers, handheld devices or other touch devices, especially in consumer smart watches, smart bracelets, smart homes, electronic cigarette products and other terminal products. Therefore, touch display modules are widely used in many consumer electronic products, resulting in the increasing importance of integrating touch modules and display modules.

[0003] As an economical consumer product, TFT display modules have a large daily shipment volume, so assembly output is very urgent and there are high requirements for the timeliness and quality of shipment. Therefore, it is necessary to optimize a set of feasible and fast production processes to meet the current consumer market demand.

[0004] Currently, in the process of assembling TFT display modules, the outer dimensions of the backlight module are used to align with the edge dimensions of the TFT display screen in the bonding part, and then the tolerance is calculated and they are bonded together. Since the combined tolerance of the two is large, the tolerance fluctuates greatly when the backlight shape and the TFT of the bonding part are aligned during mass production, resulting in the automatic assembly line being unable to perform good bonding, causing many backlight modules and TFT display screens to be misaligned during assembly, requiring continuous rework, wasting a lot of manpower, material resources and time costs. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a TFT display screen bonding method and system to solve the problem of misalignment that occurs when the current automatic assembly line assembles the TFT display screen and the backlight module.

[0006] In a first aspect, a TFT display screen lamination method comprises: Step 100, respectively obtaining a first position value and a first posture value of an edge of an AA display area of ​​the TFT display screen, and obtaining a second position value and a second posture value of an edge of a light guide plate of a backlight module; Step 200: respectively compare the first position value and the first posture value with the first position preset value and the first posture preset value, and respectively compare the second position value and the second posture value with the second position preset value and the second posture preset value, and respectively obtain a first position difference value and a first posture difference value, and a second position difference value and a second posture difference value; Step 300, adjusting the first position value and the first attitude value of the TFT display screen according to the first position difference value and the first attitude difference value, the second position difference value and the second attitude difference value, respectively, and adjusting the second position value and the second attitude value of the backlight module according to the second position difference value and the second attitude difference value; Step 400: Laminating the TFT display screen and the backlight module using the adjusted position value and attitude value; The accuracy of the edge of the AA display area is at the ns level, and the tolerance of the edge of the light guide plate is ±0.08mm.

[0007] In conjunction with the TFT display screen bonding method described in the first aspect of the present invention, in a first possible implementation manner, step 100 includes: Step 110, acquiring a first image of the edge of the AA display area; Step 120: Use a deep learning algorithm to perform feature extraction on the first image to identify and locate the edge of the AA display area, and obtain the first position value and the first posture value.

[0008] In combination with the TFT display screen bonding method described in the first aspect of the present invention, in a second possible implementation manner, the step 100 includes: Step 130, acquiring a second image of the edge of the light guide plate; Step 140: Use a deep learning algorithm to extract features from the second image to identify and locate the edge of the light guide plate, and obtain the second position value and the second posture value.

[0009] In combination with the TFT display screen bonding method described in the first aspect of the present invention, in a third possible implementation manner, between step 300 and step 400, the following steps are included: Step 301: Obtain OCA glue, and cut the OCA glue so that the OCA glue is slightly larger than the size of the bonding surface of the TFT display screen or the backlight module; Step 302: Paste the OCA glue on the bonding surface of the TFT display screen or the backlight module.

[0010] In combination with the third possible implementation manner described in the first aspect of the present invention, in a fourth possible implementation manner, the 400 includes: Step 410, maintaining the adjusted posture values ​​of the TFT display screen and the backlight module unchanged; Step 420: Laminating the TFT display screen and the backlight module.

[0011] In combination with the TFT display screen bonding method described in the first aspect of the present invention, in a fifth possible implementation manner, the TFT display screen bonding method further includes: Step 500, applying a specified temperature to the TFT display screen and the backlight module; Step 600: applying a specified pressure to the TFT display screen and the backlight module for pressing to ensure that the two are fully fitted.

[0012] In a second aspect, a TFT display screen laminating system adopts the TFT display screen laminating method described in the first aspect, comprising: A first acquisition module is used to respectively acquire a first position value and a first posture value of an edge of an AA display area of ​​the TFT display screen, and acquire a second position value and a second posture value of an edge of a light guide plate of a backlight module; a second acquisition module, configured to compare the first position value and the first posture value with the first position preset value and the first posture preset value, respectively, and compare the second position value and the second posture value with the second position preset value and the second posture preset value, respectively, to acquire a first position difference value and a first posture difference value, and a second position difference value and a second posture difference value; An adjustment module, used for adjusting the first position value and the first posture value of the TFT display screen according to the first position difference value and the first posture difference value, the second position difference value and the second posture difference value, respectively, and adjusting the second position value and the second posture value of the backlight module according to the second position difference value and the second posture difference value; A laminating module, used for laminating the TFT display screen and the backlight module by using the adjusted position value and posture value; The accuracy of the edge of the AA display area is at the ns level, and the tolerance of the edge of the light guide plate is ±0.08mm.

[0013] In conjunction with the TFT display screen bonding system described in the second aspect, in a first possible implementation manner, the first acquisition module includes: A first image acquisition unit, used for acquiring a first image of the edge of the AA display area; The first image recognition unit is used to extract features from the first image using a deep learning algorithm to identify and locate the edge of the AA display area and obtain the first position value and the first posture value.

[0014] In conjunction with the TFT display screen bonding system described in the second aspect of the present invention, in a second possible implementation manner, the first acquisition module includes: A second image acquisition unit, used for acquiring a second image of the edge of the light guide plate; The second image recognition unit is used to extract features from the second image using a deep learning algorithm to identify and locate the edge of the light guide plate and obtain the second position value and the second posture value.

[0015] In combination with the TFT display screen laminating system described in the second aspect, in a third possible implementation manner, the TFT display screen laminating system further includes: The pressing module is used to apply a specified pressure to the TFT display screen and the backlight module for pressing after applying a specified temperature to the TFT display screen and the backlight module, so as to ensure that the two are fully fitted.

[0016] The TFT display screen bonding method and system described in the present invention are implemented by taking the edge of the AA display area of ​​the high-precision TFT display screen and the edge of the light guide plate of the backlight module as the capture object, and extracting features of the captured image through a deep learning algorithm to obtain the initial position and posture, and compare them with the preset position and posture, and feed back the deviation to the system for adjustment, thereby greatly improving the assembly and bonding accuracy of the TFT display screen and the backlight module, thereby greatly reducing the waste of manpower, material resources and time, meeting the needs of the current consumer market, and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the TFT display screen bonding component of this application; Figure 2 This is a schematic diagram of the backlight module structure of this application; Figure 3 It is a flow chart of the first specific implementation method of the TFT display screen bonding method in this application; Figure 4 A flowchart of a specific implementation of S100; Figure 5 yes Figure 3 A flowchart of another specific implementation of S100; Figure 6 It is a flow chart of a second specific implementation method of the TFT display screen bonding method in this application; Figure 7 yes Figure 3 A flowchart of a specific implementation of S400; Figure 8 It is a flow chart of a third specific implementation method of the TFT display screen bonding method in this application; Fig. 9 It is a structural schematic diagram of the TFT display screen lamination system in this application. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the invention to clearly and completely describe the technical solutions in 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 in the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] The purpose of the embodiments of the present application is to provide a TFT display screen bonding method and device to solve the problem of misalignment that occurs when the current automatic assembly line assembles the TFT display screen and the backlight module.

[0024] First, as Figure 3 , Figure 3 It is a flow chart of the first specific implementation method of the TFT display screen bonding method in this application; a TFT display screen bonding method comprises: S100 , respectively obtaining a first position value and a first posture value of an edge 802 of an AA display area of ​​a TFT display screen, and obtaining a second position value and a second posture value of an edge 804 of a light guide plate of a backlight module.

[0025] In this embodiment, a gripping device in the bonding system, such as a robotic arm, a suction cup, etc., is used to grip the TFT display screen and the backlight module. The gripping force and speed should be adjusted according to the material and size of the TFT display screen and the backlight module to avoid damage to the product.

[0026] In a preferred embodiment, Figure 4 , Figure 4 A flowchart of a specific implementation method of S100; S100 includes: S100 includes: S110, obtaining a first image of the AA display area edge 802; S120, using a deep learning algorithm to extract features from the first image to identify and locate the AA display area edge 802, and obtain a first position value and a first posture value.

[0027] In this embodiment, if Figure 1 , Figure 1 This is a schematic diagram of the structure of the TFT display screen assembly of the present application; on the TFT display screen assembly, the TFT display screen edge 801 is no longer marked. As far as tolerance is concerned, the periphery of the TFT is cut by a knife wheel with a tolerance of ±0.1mm. The tolerance is too large, plus the tolerance of the backlight module, the overall tolerance causes the assembled TFT display product to be offset.

[0028] In this embodiment, considering the accuracy, the AA display area (effective display area) of the TFT display screen is used as the capture mark. In the specific implementation, since the TFT display screen module is equipped with a polarizer, the white light of the assembly line can be replaced with an infrared light, so that the automatic line equipment can well identify the edge of the AA display area of ​​the TFT display screen.

[0029] In this embodiment, the TFT AA region is formed by the TFT mold MASK, and the precision reaches ns level, which is beneficial to improve the lamination precision.

[0030] In this embodiment, the visual system of the bonding system is used for image acquisition and recognition. Before acquiring the image, it is calibrated and debugged to ensure that the visual system can accurately identify and locate the grabbing pattern. The calibration of the visual system includes the adjustment of the camera's focal length, aperture, exposure time and other parameters, as well as the establishment and calibration of the coordinate system.

[0031] In this embodiment, the first image is an image of the AA display area edge 802 acquired by the image acquisition unit, and a deep learning algorithm is used to extract features of the AA display area edge 802 to obtain the position and spatial posture of the TFT display screen.

[0032] In another preferred embodiment, Figure 5 , Figure 5 yes Figure 3A flowchart of another specific implementation of S100; S100 includes: S130, obtaining a second image of the light guide plate edge 804; S140, using a deep learning algorithm to extract features from the second image to identify and locate the light guide plate edge 804, and obtain a second position value and a second posture value.

[0033] In this embodiment, considering the lamination accuracy, the edge 804 of the light guide plate of the backlight module is used as the mark pattern. The tolerance of the backlight light guide plate is ±0.08mm, which is much smaller than the tolerance ±0.1mm of the outer edge 803 of the backlight module. In addition, the light guide plate is where the light passes through, which is conducive to image acquisition. By using the edge 804 of the light guide plate as the mark pattern, it is conducive to reducing the overall tolerance and thus improving the lamination accuracy.

[0034] In this embodiment, if Figure 2 , Figure 2 It is a schematic diagram of the backlight module structure of the present application; the second image is an image of the light guide plate edge 804 captured by the image acquisition unit, and a deep learning algorithm is used to extract the features of the light guide plate edge 804 to obtain the position and spatial posture of the backlight module.

[0035] S200, respectively compare the first position value and the first posture value with the first position preset value and the first posture preset value, and compare the second position value and the second posture value with the second position preset value and the second posture preset value, and respectively obtain the first position difference value and the first posture difference value, and the second position difference value and the second posture difference value.

[0036] In this embodiment, the first position value and the first posture value, the second position value and the second posture value are respectively the initial position and posture of the edge 802 of the display area of ​​the TFT display screen AA and the edge 804 of the light guide plate. Due to the error of the grasping mechanism, the above positions and postures need to be adjusted, that is, the preset values ​​are compared to obtain the deviation value between the two, and then the initial position and posture are adjusted according to the deviation value to improve the fitting accuracy.

[0037] S300, adjusting the first position value and the first posture value of the TFT display screen according to the first position difference and the first posture difference, the second position difference and the second posture difference, respectively, and adjusting the second position value and the second posture value of the backlight module according to the second position difference and the second posture difference.

[0038] like Figure 6 , Figure 6It is a flow chart of the second specific implementation method of the TFT display screen bonding method in the present application; between S300 and S400, it includes: S301, obtaining OCA glue, cutting the OCA glue so that the OCA glue is slightly larger than the size of the bonding surface of the TFT display screen or the backlight module; S302, pasting the OCA glue on the bonding surface of the TFT display screen or the backlight module.

[0039] In this embodiment, OCA glue is a solid optical glue, and the bonding operation is relatively simple. Cut the optical glue according to the size of the TFT display screen and the backlight module. Pay attention to the size accuracy when cutting to ensure that the optical glue can completely cover the bonding area and have appropriate margins around it. Optical glue pasting: For OCA glue, it can be directly pasted on one of the components of the TFT display screen or the backlight module, and pay attention to avoid bubbles and wrinkles.

[0040] S400, using the adjusted position value and posture value, laminating the TFT display screen and the backlight module; The accuracy of the AA display area edge 802 is at the ns level, and the tolerance of the light guide plate edge 804 is ±0.08 mm.

[0041] In a preferred embodiment, Figure 7 , Figure 7 yes Figure 3 A flowchart of a specific implementation of S400; 400 includes: S410, keeping the adjusted posture values ​​of the TFT display screen and the backlight module unchanged; S420, bonding the TFT display screen and the backlight module.

[0042] In this embodiment, after determining the position and posture of the AA display area of ​​the TFT display screen and the light guide plate of the backlight module, the TFT display screen and the backlight module are aligned and bonded. The posture should be kept unchanged during the bonding process to ensure the accuracy and quality of bonding. Inspection and adjustment: After the bonding is completed, the visual system is used again to inspect the grabbing pattern to check whether the position and posture after bonding meet the requirements.

[0043] In a preferred embodiment, the TFT display screen bonding method is as follows: Figure 8 , Figure 8 It is a flow chart of the third specific implementation method of the TFT display screen bonding method in the present application; it also includes: S500, applying a specified temperature to the TFT display screen and the backlight module; S600, applying a specified pressure to the TFT display screen and the backlight module for pressing to ensure that the two are fully bonded.

[0044] In this embodiment, the TFT display screen and the backlight module with optical glue are positioned and aligned, and OCA glue is used for bonding. After positioning and alignment, the TFT display screen and the backlight module are bonded using a bonding device, and appropriate pressure and temperature are applied so that the optical glue can fully bond the two components. The parameters such as the bonding time, pressure and temperature should be set according to the characteristics of the optical glue and product requirements. By taking the edge of the AA display area of ​​the high-precision TFT display screen and the edge of the light guide plate of the backlight module as the target of the grabbing, and extracting the features of the captured image through a deep learning algorithm, obtaining the initial position and posture, and comparing it with the preset position and posture, the deviation is fed back to the system for adjustment, which greatly improves the assembly and bonding accuracy of the TFT display screen and the backlight module, thereby greatly reducing the waste of manpower, material resources and time efficiency, meeting the needs of the current consumer market, and improving product competitiveness.

[0045] In a second aspect, a TFT display screen lamination system, such as Fig. 9 , Fig. 9 Schematic diagram of the structure of the TFT display screen laminating system in the present application. A TFT display screen laminating method according to the first aspect comprises: The first acquisition module 701 is used to respectively acquire a first position value and a first posture value of an edge 802 of an AA display area of ​​the TFT display screen, and acquire a second position value and a second posture value of an edge 804 of a light guide plate of a backlight module; A second acquisition module 702 is used to compare the first position value and the first posture value with the first position preset value and the first posture preset value, and compare the second position value and the second posture value with the second position preset value and the second posture preset value, respectively, to obtain a first position difference value and a first posture difference value, and a second position difference value and a second posture difference value; An adjustment module 703 is used to adjust the first position value and the first posture value of the TFT display screen according to the first position difference value and the first posture difference value, the second position difference value and the second posture difference value, and to adjust the second position value and the second posture value of the backlight module according to the second position difference value and the second posture difference value; The laminating module 704 is used to laminat the TFT display screen and the backlight module using the adjusted position value and posture value; The accuracy of the AA display area edge 802 is at the ns level, and the tolerance of the light guide plate edge 804 is ±0.08 mm.

[0046] Preferably, the first acquisition module 701 includes: a first image acquisition unit, used to acquire a first image of the edge 802 of the AA display area; a first image recognition unit, used to extract features from the first image using a deep learning algorithm to identify and locate the edge 802 of the AA display area, and obtain a first position value and a first posture value.

[0047] Preferably, the first acquisition module 701 includes: a second image acquisition unit, used to acquire a second image of the light guide plate edge 804; a second image recognition unit, used to extract features from the second image using a deep learning algorithm to identify and locate the light guide plate edge 804, and obtain a second position value and a second posture value.

[0048] Furthermore, the TFT display screen laminating system also includes: a laminating module, which is used to apply a specified pressure to the TFT display screen and the backlight module for laminating after applying a specified temperature to the TFT display screen and the backlight module, so as to ensure that the two are fully laminated.

[0049] The TFT display screen bonding method and system of the present invention uses the edge of the AA display area of ​​the high-precision TFT display screen and the edge of the light guide plate of the backlight module as the capture object, and extracts features of the captured image through a deep learning algorithm to obtain the initial position and posture, and compares them with the preset position and posture, and feeds back the deviation to the system for adjustment, thereby greatly improving the assembly and bonding accuracy of the TFT display screen and the backlight module, thereby greatly reducing the waste of manpower, material resources and time, meeting the needs of the current consumer market, and improving product competitiveness.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for laminating a TFT display screen, comprising: Step 100, respectively obtaining a first position value and a first posture value of an edge of an AA display area of ​​the TFT display screen, and obtaining a second position value and a second posture value of an edge of a light guide plate of a backlight module; Step 200: respectively compare the first position value and the first posture value with the first position preset value and the first posture preset value, and respectively compare the second position value and the second posture value with the second position preset value and the second posture preset value, and respectively obtain a first position difference value and a first posture difference value, and a second position difference value and a second posture difference value; Step 300, adjusting the first position value and the first attitude value of the TFT display screen according to the first position difference value and the first attitude difference value, the second position difference value and the second attitude difference value, respectively, and adjusting the second position value and the second attitude value of the backlight module according to the second position difference value and the second attitude difference value; Step 400: Laminating the TFT display screen and the backlight module using the adjusted position value and attitude value; The accuracy of the edge of the AA display area is at the ns level, and the tolerance of the edge of the light guide plate is ±0.08mm.

2. The TFT display screen bonding method according to claim 1, characterized in that: The step 100 comprises: Step 110, acquiring a first image of the edge of the AA display area; Step 120: Use a deep learning algorithm to perform feature extraction on the first image to identify and locate the edge of the AA display area, and obtain the first position value and the first posture value.

3. The TFT display screen bonding method according to claim 1, characterized in that: The step 100 comprises: Step 130, acquiring a second image of the edge of the light guide plate; Step 140: Use a deep learning algorithm to extract features from the second image to identify and locate the edge of the light guide plate, and obtain the second position value and the second posture value.

4. The TFT display screen bonding method according to claim 1, characterized in that: The steps between step 300 and step 400 include: Step 301: Obtain OCA glue, and cut the OCA glue so that the OCA glue is slightly larger than the size of the bonding surface of the TFT display screen or the backlight module; Step 302: Paste the OCA glue on the bonding surface of the TFT display screen or the backlight module.

5. The TFT display screen bonding method according to claim 4, characterized in that: The 400 includes: Step 410, maintaining the adjusted posture values ​​of the TFT display screen and the backlight module unchanged; Step 420: Laminating the TFT display screen and the backlight module.

6. The TFT display screen bonding method according to claim 1, characterized in that: The TFT display screen bonding method further includes: Step 500, applying a specified temperature to the TFT display screen and the backlight module; Step 600: applying a specified pressure to the TFT display screen and the backlight module for pressing to ensure that the two are fully fitted.

7. A TFT display screen laminating system, using a TFT display screen laminating method as described in any one of items 1-6, characterized in that: include: A first acquisition module is used to respectively acquire a first position value and a first posture value of an edge of an AA display area of ​​the TFT display screen, and acquire a second position value and a second posture value of an edge of a light guide plate of a backlight module; a second acquisition module, configured to compare the first position value and the first posture value with the first position preset value and the first posture preset value, respectively, and compare the second position value and the second posture value with the second position preset value and the second posture preset value, respectively, to acquire a first position difference value and a first posture difference value, and a second position difference value and a second posture difference value; An adjustment module, used for adjusting the first position value and the first posture value of the TFT display screen according to the first position difference value and the first posture difference value, the second position difference value and the second posture difference value, respectively, and adjusting the second position value and the second posture value of the backlight module according to the second position difference value and the second posture difference value; A laminating module, used for laminating the TFT display screen and the backlight module by using the adjusted position value and posture value; The accuracy of the edge of the AA display area is at the ns level, and the tolerance of the edge of the light guide plate is ±0.08mm.

8. The TFT display screen laminating system according to claim 7, characterized in that: The first acquisition module includes: A first image acquisition unit, used for acquiring a first image of the edge of the AA display area; The first image recognition unit is used to extract features from the first image using a deep learning algorithm to identify and locate the edge of the AA display area and obtain the first position value and the first posture value.

9. The TFT display screen laminating system according to claim 7, characterized in that: The first acquisition module includes: A second image acquisition unit, used for acquiring a second image of the edge of the light guide plate; The second image recognition unit is used to extract features from the second image using a deep learning algorithm to identify and locate the edge of the light guide plate and obtain the second position value and the second posture value.

10. The TFT display screen laminating system according to claim 7, characterized in that: The TFT display screen laminating system also includes: The pressing module is used to apply a specified pressure to the TFT display screen and the backlight module for pressing after applying a specified temperature to the TFT display screen and the backlight module, so as to ensure that the two are fully fitted.

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