Flexible oled middle frame 3d printing dispensing equipment and follow-up curing method thereof

Abstract

The application discloses a flexible oled middle frame 3D printing dispensing equipment and a follow-up curing method thereof, and belongs to the technical field of oled middle frame processing equipment. The flexible oled middle frame 3D printing dispensing equipment comprises a supporting mechanism mounted on a workbench, and the supporting mechanism is used for supporting a workpiece. The flexible oled middle frame 3D printing dispensing equipment further comprises a dispensing mechanism. The piezoelectric valve utilizes the inverse piezoelectric effect of piezoelectric ceramics to drive the plunger to open and close at a high frequency, controls glue to be sprayed through a nozzle, and simultaneously, a UV light source emits ultraviolet rays to instantly cure the glue. The glue path width can be controlled to be less than or equal to 250 microns, and the glue flow collapse can be prevented, so that the display requirement of an extremely narrow frame of the oled middle frame is met, and the traditional LIPO grouting process is replaced. Meanwhile, the width of the glue path made reaches an extremely narrow standard in the industry, the frame display area is expanded, and the strength of the cured glue layer is improved, so that the packaging reliability is improved and guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of OLED mid-frame processing equipment, and particularly relates to flexible OLED mid-frame 3D printing dispensing equipment and its follow-up curing method. Background Technology

[0002] With the rapid iteration of flexible OLED display technology, the demand for extremely narrow screen bezels and diverse shapes in the consumer electronics field is becoming increasingly urgent. From the quad-curved waterfall screens of smartphones to the panoramic curved screens of wearable devices, the structure of flexible OLED frames has gradually evolved from traditional 2D planes to complex forms such as 2.5D curved surfaces and 3D multi-curvature composite curved surfaces. Currently, the Apple 15 / 16 series, Xiaomi 15, and OPPO Find series all use LIPO grouting technology to achieve extremely narrow bezels instead of frame support technology. However, LIPO grouting technology is currently limited to flat screens. When dealing with curved screens such as quad-curved and double-curved screens, LIPO grouting technology suffers from problems such as adhesive collapse and edge overflow.

[0003] Against this backdrop, the technological path is evolving from the traditional LIPO grouting process to 3D printing dispensing technology. However, existing flexible OLED mid-frame dispensing technology still has the following shortcomings:

[0004] First, the adhesive curing process is disconnected from the dispensing process, making it impossible to achieve precise curing at the moment of adhesive spraying. This causes the highly fluid adhesive to be prone to shape distortion, making it difficult to control the molding precision of extremely narrow adhesive paths, which can no longer meet the packaging requirements of flexible OLED devices.

[0005] Secondly, conventional three-axis dispensing equipment lacks rotation axis control, making it impossible to achieve real-time matching between the adhesive path and the surface normal vector, resulting in uneven adhesive layer thickness. In particular, adhesive accumulation or leakage is prone to occur at the turning points of the curved surface. Summary of the Invention

[0006] The purpose of this invention is to provide a 3D printing dispensing device for flexible OLED mid-frames and its follow-up curing method, which solves the technical problem in the prior art that the adhesive curing stage and the dispensing process are disconnected in the flexible OLED mid-frame dispensing technology, making it impossible to achieve precise curing at the moment of adhesive spraying. This results in the highly fluid adhesive being prone to morphological distortion and making it difficult to control the molding accuracy of extremely narrow adhesive paths, which can no longer meet the packaging requirements of flexible OLED devices.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A flexible OLED mid-frame 3D printing dispensing device includes a support mechanism mounted on a worktable for supporting the workpiece, and a dispensing mechanism comprising: a gantry frame mounted on the top surface of the worktable; a movable frame slidably connected to the gantry frame; a mounting plate slidably connected to the movable frame; a mounting frame mounted on the mounting plate; a piezoelectric valve mounted on the mounting plate, with a nozzle at its bottom, the piezoelectric valve controlling the spraying of adhesive, causing the adhesive to be sprayed onto the workpiece through the nozzle; and a UV light source mounted on the mounting frame, the center of which illuminates the dispensing point of the nozzle, preventing the adhesive from collapsing during curing.

[0009] Preferably, the dispensing mechanism further includes: an X-axis linear drive assembly, mounted on the gantry and connected to the movable frame, for driving the movable frame to move horizontally along the X-axis; and a Z-axis linear drive assembly, mounted on the movable frame and connected to the mounting plate, for driving the mounting plate to move vertically along the Z-axis.

[0010] Preferably, the dispensing mechanism further includes: a guide camera, mounted on the mounting plate, for positioning the workpiece; and a 3D line scanning laser, mounted on the mounting plate via a connecting plate, for scanning the shape of the workpiece.

[0011] Preferably, the dispensing mechanism further includes: a fixing plate, mounted on the mounting frame; a mounting base, slidably mounted on the fixing plate; and a recording lens, mounted on the mounting base, for observing and recording the adhesive pattern on the workpiece.

[0012] Preferably, the workpiece support mechanism includes: a Y-axis linear drive assembly mounted on the top surface of the worktable; a movable plate connected to the Y-axis linear drive assembly, the Y-axis linear drive assembly being used to drive the movable plate to move horizontally along the Y-axis; two vertical plate frames, both mounted on the top surface of the movable plate; a mounting frame rotatably connected to the two vertical plate frames; a DD motor mounted inside the mounting frame; a dispensing platform fixedly connected to the power output shaft of the DD motor, used to support the workpiece; and a drive motor mounted on the vertical plate frames, its power output shaft being fixedly connected to the mounting frame.

[0013] Preferably, the flexible OLED mid-frame 3D printing dispensing equipment further includes a control system, which includes: a type setting unit for receiving the adhesive type and corresponding weighting coefficient set by the user; a data acquisition unit including a DC voltage sensor, a temperature sensor, and a humidity sensor, which measures the driving voltage of the piezoelectric valve, the ambient temperature, and the ambient humidity, respectively; a data processing unit for receiving the piezoelectric valve driving voltage, ambient temperature, and ambient humidity from the data acquisition module, calculating the amount of adhesive sprayed based on the piezoelectric valve driving voltage, calculating the required reference light intensity based on the amount of adhesive sprayed and the adhesive type, and finally adjusting the reference light intensity based on the amount of adhesive sprayed, the ambient temperature, and the ambient humidity to obtain the approved light intensity; and a control unit for adjusting the light intensity of the UV light source based on the approved light intensity sent by the data processing unit.

[0014] Preferably, the temperature sensor and humidity sensor collect data once every 2 seconds by default; if the temperature fluctuates by more than 5°C within 1 hour, or the humidity fluctuates by more than 30%RH within 1 hour, the temperature sensor and humidity sensor will automatically be upgraded to collect data once every 1 second in subsequent production.

[0015] Preferably, the flexible OLED mid-frame 3D printing dispensing equipment further includes: a base frame, installed on the bottom surface of the worktable, for supporting the worktable; and multiple sets of support components, all installed on the bottom surface of the base frame.

[0016] Preferably, the support assembly includes: a threaded rod mounted on the bottom surface of the base frame; a support base threadedly connected to the threaded rod; and a base plate rotatably connected to the bottom surface of the support base.

[0017] A follow-up curing method for a 3D printing dispensing device for flexible OLED mid-frames includes the following steps: Step 1: Place the workpiece to be dispensed onto the dispensing platform of the support mechanism; Step 2: Activate the guide camera to capture images of the workpiece and transmit the images to the host computer; activate the 3D line scanning laser to scan the surface of the workpiece, acquire the three-dimensional contour data of the product, and transmit it to the host computer; the host computer constructs a three-dimensional model of the product based on the received images and three-dimensional contour data, and uses an algorithm to generate the dispensing path; Step 3: Adjust the position of the nozzle in the dispensing mechanism to align it with the area to be dispensed on the workpiece; Step 4: Activate the dispensing mechanism, the piezoelectric valve starts working, and the adhesive is sprayed onto the workpiece through the nozzle. During adhesive spraying, a UV light source emits ultraviolet light to irradiate the adhesive, causing it to cure; Step 5: Through the cooperation of the X-axis linear drive assembly, Z-axis linear drive assembly, Y-axis linear drive assembly, DD motor, and drive motor, the nozzle is driven to move along the planned dispensing path to achieve multi-angle processing.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] 1. The flexible OLED mid-frame 3D printing dispensing equipment of this invention uses a piezoelectric valve and a UV light source. The piezoelectric valve uses the inverse piezoelectric effect of piezoelectric ceramics to drive the impact pin to open and close at high frequency, controlling the glue to be sprayed out through the nozzle. At the same time, the UV light source emits ultraviolet light to instantly cure the glue, which can control the glue path width to ≤250μm and prevent flow collapse, meeting the display requirements of ultra-narrow bezels of OLED mid-frames and replacing the traditional LIPO grouting process. At the same time, the width of the glue path produced reaches the industry's ultra-narrow standard, the bezel display area is expanded, and the strength of the cured glue layer is also improved, thereby improving the reliability of the encapsulation.

[0020] 2. The flexible OLED mid-frame 3D printing dispensing device of the present invention is equipped with an X-axis linear drive component, a Z-axis linear drive component, a Y-axis linear drive component, a DD motor and a drive motor. The X-axis linear drive component and the Z-axis linear drive component can drive the dispensing mechanism to move along the X-axis and Z-axis. The Y-axis linear drive component, the DD motor and the drive motor can control the material support mechanism to translate along the Y-axis and rotate around the R-axis and θ-axis, forming a five-axis linkage, so that the nozzle can move along any curved surface trajectory, adapting to the dispensing needs of curved screens such as quad-curved screens and double-curved screens.

[0021] 3. The flexible OLED mid-frame 3D printing dispensing equipment in this invention, through the setting of a control system, can calculate the amount of adhesive sprayed in real time by driving the voltage of the piezoelectric valve, and combine it with the dynamic adjustment of the UV light intensity to ensure that the adhesive can receive appropriate ultraviolet irradiation during the spraying process, thereby enabling the adhesive to cure quickly. While ensuring the best curing effect, it also achieves efficient energy utilization. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the flexible OLED mid-frame 3D printing dispensing device in this invention;

[0024] Figure 2 In this invention Figure 1 Enlarged schematic diagram of part A;

[0025] Figure 3 This is a right view of the dispensing mechanism in this invention;

[0026] Figure 4 This is a perspective view of the dispensing mechanism in this invention;

[0027] Figure 5 In this invention Figure 4 Enlarged schematic diagram of part B;

[0028] Figure 6 This is a top view of the material support mechanism in this invention;

[0029] Figure 7 This is a perspective view of the object-supporting mechanism in this invention;

[0030] Figure 8 In this invention Figure 7 Enlarged schematic diagram of part C;

[0031] Figure 9 This is a block diagram of the control system in this invention;

[0032] Reference numerals: 100, worktable; 101, base frame; 110, support assembly; 111, threaded rod; 112, support base; 113, base plate; 200, material handling mechanism; 201, Y-axis linear drive assembly; 202, moving plate; 203, vertical plate frame; 204, mounting frame; 205, DD motor; 206, dispensing platform; 207, drive motor; 300, dispensing mechanism; 301, gantry frame; 302, moving frame; 303, X-axis linear drive assembly; 304, Z-axis linear drive assembly; 305, mounting plate; 306, guide camera; 307, mounting frame; 308, piezoelectric valve; 3081, nozzle; 309, UV light source; 310, 3D line scan laser; 311, connecting plate; 312, recording lens; 313, mounting base; 314, fixing plate. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0036] This invention is described in detail with reference to the accompanying drawings. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not to scale. Furthermore, the accompanying drawings are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0037] Furthermore, it should be noted in the description of this invention that the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example: Figure 1 and Figures 3-5 As shown, the flexible OLED mid-frame 3D printing dispensing equipment includes a support mechanism 200 mounted on a worktable 100 for supporting the workpiece. The equipment also includes a dispensing mechanism 300, which comprises a gantry 301, a moving frame 302, a mounting plate 305, a mounting frame 307, a piezoelectric valve 308, and a UV light source 309. The workpiece mentioned in this article is an OLED screen.

[0040] The gantry frame 301 is mounted on the top surface of the workbench 100; the movable frame 302 is slidably connected to the gantry frame 301; the mounting plate 305 is slidably connected to the movable frame 302; the mounting frame 307 is mounted on the mounting plate 305; the piezoelectric valve 308 is mounted on the mounting plate 305, and a nozzle 3081 is provided at the bottom of the piezoelectric valve 308. The inner diameter of the nozzle 3081 is ≤50μm. The piezoelectric valve 308 is used to control the spraying of adhesive, so that the adhesive is sprayed onto the workpiece through the nozzle 3081; the piezoelectric valve 308 is also known as a piezoelectric spray valve, and its core components are the firing pin and the nozzle 3081. In the initial state, the adhesive fills the flow channel of the valve body, and the firing pin blocks the nozzle 3081, forming a closed environment. When voltage is applied to the piezoelectric actuator, the actuator will extend laterally, causing the firing pin to lift, thereby opening the nozzle 3081, and the adhesive flows out of the nozzle 3081 under air pressure. Subsequently, the piezoelectric brake retracts, and at the same time, the firing pin quickly returns to its original position under the tension of the spring, forcefully ejecting the glue from nozzle 3081 and blocking nozzle 3081.

[0041] The UV light source 309 is mounted on the mounting frame 307. The center of the light source emitted by the UV light source 309 illuminates the dispensing point of the nozzle 3081, so that the glue cures and does not collapse.

[0042] Specifically, by activating the piezoelectric valve 308, the adhesive is sprayed onto the workpiece through an extremely fine nozzle 3081. At the instant the adhesive is sprayed, the UV light source 309 emits ultraviolet light to irradiate the adhesive, triggering a photoinitiator reaction within the adhesive and causing it to cure rapidly. Because the piezoelectric valve 308 and the UV light source 309 move almost synchronously (the light source lags behind the adhesive release by ≤50ms), it ensures that the adhesive is cured immediately after spraying, preventing the adhesive from flowing and collapsing on the workpiece. This achieves precise control of an extremely narrow adhesive path (width ≤250μm), meeting the dispensing requirements of workpieces (OLED screens) with extremely narrow bezels.

[0043] like Figure 4 and Figure 5 As shown, the dispensing mechanism 300 also includes an X-axis linear drive assembly 303 and a Z-axis linear drive assembly 304. The X-axis linear drive assembly 303 is mounted on the gantry 301 and connected to the movable frame 302. The X-axis linear drive assembly 303 is used to drive the movable frame 302 to move horizontally along the X-axis. The Z-axis linear drive assembly 304 is mounted on the movable frame 302 and connected to the mounting plate 305. The Z-axis linear drive assembly 304 is used to drive the mounting plate 305 to move vertically along the Z-axis.

[0044] Specifically, by setting the X-axis linear drive assembly 303 and the Z-axis linear drive assembly 304, the mounting plate 305 can move along the X-axis and Z-axis.

[0045] like Figure 5As shown, the dispensing mechanism 300 also includes a guide camera 306 and a 3D line scanning laser 310. The guide camera 306 is mounted on the mounting plate 305 and is used to position the workpiece; the 3D line scanning laser 310 is mounted on the mounting plate 305 via a connecting plate 311 and is used to scan the shape of the workpiece.

[0046] Specifically, before use, both the guide camera 306 and the 3D line-scanning laser instrument 310 are connected to the host computer. During use, the workpiece to be glued is placed on the support mechanism 200. The guide camera 306 and the 3D line-scanning laser instrument 310 are then activated. The guide camera 306 first captures an initial image of the product and then transmits the image to the host computer. The host computer's vision processing software analyzes the image and identifies the workpiece's position and orientation. Simultaneously, the 3D line-scanning laser instrument 310 emits a laser beam to scan the workpiece surface, acquiring the product's three-dimensional contour data and transmitting it to the host computer. The host computer then constructs a three-dimensional model of the product.

[0047] The host computer analyzes the workpiece position, orientation, and 3D model data obtained from the vision processing software, and combines this with dispensing process parameters (such as adhesive path width and number of stacking layers) to generate a dispensing path using algorithms. This path planning takes into account factors such as the product's curved surface shape and the start and end positions of the dispensing, ensuring that the adhesive path uniformly and accurately covers the area of ​​the workpiece to be dispensed. Existing technologies and solutions can be used for this part.

[0048] like Figure 5 As shown, the dispensing mechanism 300 also includes a fixing plate 314, a mounting base 313, and a recording lens 312. The fixing plate 314 is mounted on the mounting frame 307; the mounting base 313 is slidably mounted on the fixing plate 314; the recording lens 312 is mounted on the mounting base 313 and is used to observe and record the adhesive pattern on the workpiece. A sliding mechanism is provided on the fixing plate 314, and a cylindrical sliding rod is rotatably mounted on the mounting base 313. The mounting base 313 is connected to the fixing plate 314 via the sliding rod, allowing the mounting base 313 to slide and rotate relative to the fixing plate 314, thereby facilitating the adjustment of the position and angle of the recording lens 312.

[0049] Specifically, before use, the recording lens 312 is connected to the host computer. During use, the recording lens 312 captures the dispensing and cured adhesive in real time, and transmits the video signal to the host computer for display and storage, recording the real-time status of the adhesive (such as width, height and continuity), which is convenient for subsequent detection of dispensing quality, tracing of the production process, and timely detection and elimination of equipment failures or process abnormalities.

[0050] like Figures 6-8 As shown, the material handling mechanism 200 includes a Y-axis linear drive assembly 201, a moving plate 202, two vertical plate frames 203, a mounting frame 204, a dispensing platform 206, and a drive motor 207.

[0051] Y-axis linear drive assembly 201 is installed on the top surface of worktable 100; movable plate 202 is connected to Y-axis linear drive assembly 201, and Y-axis linear drive assembly 201 is used to drive movable plate 202 to move horizontally along Y-axis; two vertical plate frames 203 are both installed on the top surface of movable plate 202.

[0052] Mounting bracket 204 is rotatably connected to two vertical plate brackets 203; DD motor 205 is installed inside mounting bracket 204; dispensing platform 206 is fixedly connected to the power output shaft of DD motor 205, and dispensing platform 206 is used to support workpiece; drive motor 207 is installed on vertical plate bracket 203, and the power output shaft of drive motor 207 is fixedly connected to mounting bracket 204.

[0053] Specifically, the Y-axis linear drive assembly 201 drives the movable plate 202 to move horizontally along the Y-axis, thereby driving the vertical plate frame 203, the mounting frame 204, and the dispensing platform 206 to move horizontally along the Y-axis. The drive motor 207 drives the mounting frame 204 to rotate, thereby driving the dispensing platform 206 to rotate along the R-axis, which is the rotation axis around the Y-axis; when the DD motor 205 is running, it drives the dispensing platform 206 to rotate along the θ-axis, which is the rotation axis around the Z-axis.

[0054] The cooperation of the X-axis linear drive assembly 303, Z-axis linear drive assembly 304, Y-axis linear drive assembly 201, DD motor 205 and drive motor 207 facilitates the nozzle 3081 to perform multi-angle processing on the workpiece on the dispensing platform 206.

[0055] The X-axis linear drive assembly 303, Z-axis linear drive assembly 304, and Y-axis linear drive assembly 201 each consist of a linear guide, a geared motor, a ball screw, and a screw nut. When the geared motor is energized, it drives the ball screw to rotate, and the screw nut converts the rotational motion into linear motion. The structure and working principle of the X-axis linear drive assembly 303, Z-axis linear drive assembly 304, and Y-axis linear drive assembly 201 are well known to those skilled in the art.

[0056] like Figure 1 and Figure 2 As shown, the flexible OLED mid-frame 3D printing dispensing equipment also includes a base frame 101 and multiple sets of support assemblies 110. The base frame 101 is mounted on the bottom surface of the worktable 100 and is used to support the worktable 100; the multiple sets of support assemblies 110 are all mounted on the bottom surface of the base frame 101. The support assembly 110 includes a threaded rod 111, a support seat 112, and a base plate 113. The threaded rod 111 is mounted on the bottom surface of the base frame 101; the support seat 112 is threadedly connected to the threaded rod 111; and the base plate 113 is rotatably connected to the bottom surface of the support seat 112.

[0057] Specifically, the worktable 100 can be supported by the base frame 101 and multiple sets of support components 110. By rotating the support base 112 and adjusting its position on the threaded rod 111, the overall height of the support components 110 can be adjusted, thereby facilitating the adjustment of the height and level of the worktable 100.

[0058] Working principle: Before use, connect the recording lens 312, the guide camera 306 and the 3D line scan laser instrument 310 to the host computer (industrial control computer or computer).

[0059] In use, the workpiece to be glued is placed on the support mechanism 200. The guide camera 306 and the 3D line-scanning laser instrument 310 are then activated. The guide camera 306 first captures an initial image of the product and then transmits the image to the host computer. The host computer's vision processing software analyzes the image and identifies the position and orientation of the workpiece. Simultaneously, the 3D line-scanning laser instrument 310 emits a laser beam to scan the surface of the workpiece, acquiring the product's three-dimensional contour data and transmitting it to the host computer. The host computer then constructs a three-dimensional model of the product.

[0060] The host computer analyzes the workpiece position, orientation, and 3D model data obtained from the vision processing software, and combines this with preset dispensing process parameters (such as adhesive path width and stacking layers) to generate a dispensing path using algorithms. This path planning takes into account factors such as the product's curved surface shape and the start and end positions of the dispensing, ensuring that the adhesive path uniformly and accurately covers the area of ​​the workpiece to be dispensed.

[0061] Then, the nozzle 3081 is aligned with the area of ​​the workpiece to be glued. Then, through the cooperation of the X-axis linear drive assembly 303, Z-axis linear drive assembly 304, Y-axis linear drive assembly 201, DD motor 205 and drive motor 207, the nozzle 3081 is driven to move according to the planned glue dispensing path.

[0062] During the movement of nozzle 3081, the piezoelectric valve 308 is activated to spray the adhesive onto the workpiece through nozzle 3081; at the same time, the UV light source 309 is activated (the light source lags behind the adhesive output by ≤50ms) to emit ultraviolet light to irradiate and cure the freshly sprayed adhesive, so as to achieve simultaneous spraying and curing of the adhesive, prevent the adhesive from flowing and collapsing, and thus accurately control the shape and width of the adhesive path.

[0063] Furthermore, during the dispensing process, the guide camera 306 continuously captures images of the dispensing process on the workpiece surface and transmits these images to the host computer in real time. The host computer records the real-time status of the adhesive (such as width, height, and continuity), facilitating subsequent inspection of dispensing quality, tracing the production process, and timely detection and resolution of equipment malfunctions or process anomalies.

[0064] Meanwhile, the 3D line scanning laser instrument 310 will also monitor the height and shape of the cured adhesive layer on the workpiece surface in real time, providing a basis for subsequent dispensing parameter adjustments, such as adjusting the dispensing volume of the piezoelectric valve 308 according to the adhesive layer height, to ensure the stability and accuracy of the entire dispensing process.

[0065] Example 2: Figure 9 As shown, while all other parts are the same as in Example 1, the difference between this example and Example 1 is that:

[0066] The flexible OLED mid-frame 3D printing dispensing equipment also includes a control system, which comprises a type setting unit, a data acquisition unit, a data processing unit, and a control unit.

[0067] The type setting unit is used to receive the glue type and corresponding weight coefficient set by the user;

[0068] The data acquisition unit includes a DC voltage sensor, a temperature sensor, and a humidity sensor. The DC voltage sensor, temperature sensor, and humidity sensor measure the driving voltage of the piezoelectric valve 308, the ambient temperature, and the ambient humidity, respectively. The temperature sensor and humidity sensor collect data every 2 seconds by default. If the temperature fluctuates by more than 5°C within 1 hour, or the humidity fluctuates by more than 30%RH within 1 hour, it is recorded as a severe environmental condition. In subsequent production, the temperature sensor and humidity sensor will automatically collect data every 1 second.

[0069] The data processing unit is used to receive the piezoelectric valve 308 driving voltage, ambient temperature and ambient humidity from the data acquisition module, calculate the amount of adhesive to be sprayed based on the piezoelectric valve 308 driving voltage, calculate the required reference light intensity based on the amount of adhesive to be sprayed and the type of adhesive, and finally adjust the reference light intensity based on the amount of adhesive to be sprayed, ambient temperature and ambient humidity to obtain the approved light intensity.

[0070] The control unit adjusts the light intensity of the UV light source 309 according to the approved light intensity sent by the data processing unit.

[0071] The amount of adhesive to be sprayed is calculated as follows: ;

[0072] In the formula, Q represents the amount of adhesive dispensed; U is the driving voltage of the piezoelectric valve 308; and a, b, and c are all weighting coefficients.

[0073] The methods for obtaining a, b, and c are as follows:

[0074] By collecting the driving voltage signal and substituting it into the calibration formula, the glue volume is calculated. Specifically, with the air pressure and nozzle 3081 size fixed, the glue volume is mainly related to the driving voltage (the higher the driving voltage, the longer the firing pin opening time, and the greater the glue volume).

[0075] First, at different driving voltages Repeat the dispensing process 100 times.

[0076] The total amount of glue is then weighed using a balance with an accuracy of 0.1 mg, and the average glue dispensing amount Q per batch is calculated.

[0077] Finally, the least squares method was used to fit the Q-U curve to determine the coefficients a, b, and c.

[0078] The reference illuminance is calculated as follows: ;

[0079] In the formula: I represents the reference light intensity, in mW / cm2; Q represents the amount of adhesive dispensed, in nL; K1 represents the proportionality coefficient; I0 ​​is the reference light intensity, which defaults to 600mW / cm2; K2 represents the weighting coefficient corresponding to the type of adhesive. When the adhesive is a fast-curing acrylic adhesive (such as UV adhesive), the default K2 is 0.8; when the adhesive is a slow-curing epoxy adhesive, the default K2 is 1.3. K1 can be determined through dispensing and curing experiments under fixed temperature and humidity.

[0080] It should be noted that the weighting coefficients in the formula and the preset thresholds in the analysis process are set by those skilled in the art based on the actual situation or obtained by simulation of a large amount of data. The size of the weighting coefficient is a specific value obtained by quantifying each parameter to facilitate subsequent comparison. The size of the weighting coefficient depends on the amount of sample data and the processing coefficients initially set by those skilled in the art for each set of sample data. As long as it does not affect the proportional relationship between the parameter and the quantified value, it is acceptable.

[0081] The approved light intensity is generated as follows:

[0082] Approved light intensity = Base light intensity + Temperature adjustment value + Humidity adjustment value;

[0083] Set the ambient temperature to 25℃ and the humidity to 60%RH as the standard temperature and humidity.

[0084] When Q ≤ 50 nL, for every 1°C increase in the ambient temperature difference ΔT, the light intensity decreases by 10 mW / cm², and for every 1°C decrease in the ambient temperature difference ΔT, the light intensity increases by 10 mW / cm². ΔT = measured ambient temperature - 25°C. For every 5% decrease in humidity (based on 60% RH), the light intensity decreases by 2 mW / cm², and for every 5% increase in humidity (based on 60% RH), the light intensity increases by 2 mW / cm². Taking an ambient temperature of 28°C and humidity of 52% RH as an example, when Q ≤ 50 nL, the temperature adjustment value is -30 mW / cm², and the humidity adjustment value is -3.2 mW / cm².

[0085] When 50nL<Q≤150nL, for every 1°C increase in the ambient temperature difference ΔT, the light intensity decreases by 12mW / cm², and for every 1°C decrease in the ambient temperature difference ΔT, the light intensity increases by 12mW / cm²; for every 5%RH fluctuation in humidity change, the intensity varies by ±3mW / cm².

[0086] When Q>150nL, for every 1°C increase in the ambient temperature difference ΔT, the light intensity decreases by 14mW / cm², and for every 1°C decrease in the ambient temperature difference ΔT, the light intensity increases by 14mW / cm². For every 5%RH fluctuation in humidity change, the intensity varies by ±4mW / cm².

[0087] The present control system calculates the glue spraying amount in real time through the driving voltage of the piezoelectric valve 308, and combines the dynamic adjustment of the light intensity of the UV light source 309 to ensure that the glue can receive appropriate ultraviolet irradiation during the spraying process, so that the glue is cured rapidly. While ensuring the optimal curing effect, efficient utilization of energy is also achieved.

[0088] Embodiment 3: As shown in Figure 9 , on the premise that all other parts are the same as those in Embodiment 2, the difference between this embodiment and Embodiment 2 lies in:

[0089] Preset parameters: the glue type is fast-curing acrylate glue, k2=0.8; the standard temperature and humidity are temperature 25°C, humidity 60%RH; the basic light intensity is I0=600mW / cm²; the proportional coefficient is set to k1=2; a=0.01 and b=-1, c=20 in the glue spraying amount formula.

[0090] The data measured by the DC voltage sensor, the temperature sensor and the humidity sensor are respectively: the driving voltage of the piezoelectric valve 308 is 100V, the ambient temperature is 28°C, and the ambient humidity is 55%RH.

[0091] According to calculation, the glue spraying amount Q is 20nL;

[0092] Then according to the reference light intensity formula calculation, the reference light intensity is 512mW / cm²;

[0093] The temperature difference is +3°C, the humidity difference is -5%RH. Since Q=20nL<50nL, the temperature adjustment value is (28−25)×(−10)=−30mW / cm²; the humidity adjustment value is (55−60) / 5×(−2)=−2mW / cm²;

[0094] The verified light intensity is: 512-30-2=480mW / cm².

[0095] The table below shows the approved light intensity under different driving voltages, ambient temperatures, and ambient humidity conditions (preset parameters are the same as above).

[0096]

[0097] Example 4: A follow-up curing method for a 3D printing dispensing device for flexible OLED mid-frames, comprising the following steps:

[0098] Step 1: Place the workpiece to be glued on the glue dispensing platform 206 of the support mechanism 200, and ensure that the workpiece is in a stable position;

[0099] Step 2: Start the guide camera 306 to take pictures of the workpiece, obtain the initial image, and transmit the image to the host computer; at the same time, start the 3D line scanning laser instrument 310 to scan the surface of the workpiece, obtain the three-dimensional contour data of the product, and transmit it to the host computer. The host computer constructs a three-dimensional model of the product based on the received image and three-dimensional contour data, providing a basis for subsequent dispensing path planning.

[0100] Step 3: The host computer analyzes the images captured by the guide camera 306 through vision processing software, identifies the position and posture of the workpiece, and combines the workpiece's 3D model data and preset dispensing process parameters. The host computer uses an algorithm to generate a dispensing path to ensure that the glue path evenly and accurately covers the area of ​​the workpiece to be dispensed.

[0101] Step 4: Adjust the position of nozzle 3081 of the dispensing mechanism 300 so that it is aligned with the area of ​​the workpiece to be dispensed.

[0102] Step 5: By starting the dispensing mechanism 300, the piezoelectric valve 308 starts working, and the glue is sprayed onto the workpiece through the nozzle 3081. When the glue is sprayed, the UV light source 309 emits ultraviolet light to irradiate the glue, so that the glue is cured while being sprayed, preventing the glue from flowing and collapsing.

[0103] Step Six: Through the cooperation of the X-axis linear drive assembly 303, Z-axis linear drive assembly 304, Y-axis linear drive assembly 201, DD motor 205 and drive motor 207, the nozzle 3081 is driven to move according to the planned dispensing path to achieve multi-angle processing;

[0104] Step 7: Guide camera 306 to continuously capture images of the dispensing process on the workpiece surface and transmit the images to the host computer in real time. The host computer records the real-time status of the adhesive, including the width, height, and continuity of the adhesive path.

[0105] Step 8: After the dispensing mechanism 300 completes all dispensing operations according to the planned path, stop the dispensing and curing operations, and perform quality inspection on the dispensed workpiece, including checking whether the uniformity, continuity, and width of the glue path meet the requirements. Record the data during the dispensing process and store it in the host computer for subsequent traceability of the production process and troubleshooting of equipment failures or process abnormalities.

[0106] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0107] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible OLED mid-frame 3D printing dispensing device, comprising a support mechanism mounted on a worktable, the support mechanism being used to support the workpiece, characterized in that, It also includes a dispensing mechanism, which comprises: A gantry frame is installed on the top surface of the workbench; A movable frame is slidably connected to the gantry frame; The mounting plate is slidably connected to the movable frame; The mounting frame is mounted on the mounting plate; A piezoelectric valve is mounted on the mounting plate, and a nozzle is provided at its bottom. The piezoelectric valve is used to control the spraying of glue, so that the glue is sprayed onto the workpiece through the nozzle. A UV light source is installed on the mounting frame, and the center of the light emitted by the source illuminates the dispensing point of the nozzle, so that the glue cures and does not collapse.

2. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 1, characterized in that, The dispensing mechanism further includes: An X-axis linear drive assembly is mounted on the gantry and connected to the movable frame, used to drive the movable frame to move horizontally along the X-axis. The Z-axis linear drive assembly is mounted on the movable frame and connected to the mounting plate, and is used to drive the mounting plate to move vertically along the Z-axis.

3. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 2, characterized in that, The dispensing mechanism further includes: A guide camera, mounted on the mounting plate, is used for positioning the workpiece; The 3D line scanning laser is mounted on the mounting plate via a connecting plate and is used to scan the shape of the workpiece.

4. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 3, characterized in that, The dispensing mechanism further includes: A fixing plate is installed on the mounting frame; The mounting base is slidably mounted on the fixed plate; A recording lens, mounted on the mounting base, is used to observe and record the adhesive pattern on the workpiece.

5. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 4, characterized in that, The cargo handling mechanism includes: The Y-axis linear drive assembly is mounted on the top surface of the worktable; A movable plate is connected to the Y-axis linear drive assembly, which is used to drive the movable plate to move horizontally along the Y-axis. Two vertical plate frames are installed on the top surface of the movable plate; The mounting bracket is rotatably connected to the two vertical plate brackets; The DD motor is installed within the mounting bracket; The dispensing platform is fixedly connected to the power output shaft of the DD motor and is used to support the workpiece; A drive motor is mounted on the vertical plate frame, and its power output shaft is fixedly connected to the mounting frame.

6. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 5, characterized in that, It also includes a control system, which includes: The type setting unit is used to receive the glue type and corresponding weight coefficient set by the user. The data acquisition unit includes a DC voltage sensor, a temperature sensor, and a humidity sensor, which measure the drive voltage of the piezoelectric valve, the ambient temperature, and the ambient humidity, respectively. The data processing unit is used to receive the piezoelectric valve drive voltage, ambient temperature and ambient humidity transmitted by the data acquisition module, calculate the amount of adhesive to be sprayed based on the piezoelectric valve drive voltage, calculate the required reference light intensity based on the amount of adhesive to be sprayed and the type of adhesive, and finally adjust the reference light intensity based on the amount of adhesive to be sprayed, ambient temperature and ambient humidity to obtain the approved light intensity. The control unit adjusts the light intensity of the UV light source based on the approved light intensity sent by the data processing unit.

7. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 6, characterized in that, The temperature and humidity sensors collect data every 2 seconds by default; if the temperature fluctuates by more than 5°C within 1 hour, or the humidity fluctuates by more than 30%RH within 1 hour, the temperature and humidity sensors will automatically be upgraded to collect data every 1 second in subsequent production.

8. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 1, characterized in that, Also includes: A base frame is installed on the bottom surface of the workbench to support the workbench; Multiple sets of support components are installed on the bottom surface of the base frame.

9. The flexible OLED mid-frame 3D printing dispensing equipment according to claim 8, characterized in that, The support components include: A threaded rod is installed on the bottom surface of the base frame; The support base is threadedly connected to the threaded rod; The base plate is rotatably connected to the bottom surface of the support seat.

10. A follow-up curing method for a 3D printing dispensing device for flexible OLED mid-frames, characterized in that, Includes the following steps: Step 1: Place the workpiece to be glued onto the glue dispensing platform of the support mechanism; Step 2: Start the guide camera to take pictures of the workpiece and transmit the images to the host computer. Start the 3D line scanning laser to scan the surface of the workpiece, obtain the three-dimensional contour data of the product, and transmit it to the host computer. The host computer constructs a three-dimensional model of the product based on the received images and three-dimensional contour data. The host computer uses an algorithm to generate the dispensing path. Step 3: Adjust the position of the nozzle in the dispensing mechanism so that it is aligned with the area of ​​the workpiece to be dispensed with glue; Step 4: By activating the dispensing mechanism, the piezoelectric valve starts working, and the glue is sprayed onto the workpiece through the nozzle. During the glue spraying, the UV light source emits ultraviolet light to irradiate the glue, causing it to cure. Step 5: Through the cooperation of the X-axis linear drive assembly, Z-axis linear drive assembly, Y-axis linear drive assembly, DD motor and drive motor, the nozzle is driven to move along the planned dispensing path to achieve multi-angle processing.

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