Dispensing quality improvement method

Abstract

The application discloses a dispensing quality improving method, comprising the following steps: step 1: determining the optimal glue flow rate and dispensing time; step 2: setting the dispensing equipment to dispense the display module product according to the optimal glue flow rate and dispensing time; step 3: monitoring the glue flow rate and dispensing time, and determining that the product is qualified when the glue flow rate and dispensing time are both within the appropriate range, otherwise, the product is unqualified; and step 4: taking a photo of the display module product after dispensing by a CCD camera, and detecting whether the dispensing has problems by a visual algorithm. The application has the beneficial effects that the dispensing quality can be quantitatively monitored by monitoring the glue flow rate and dispensing time during the dispensing process, the dispensing quality can be automatically monitored by the visual monitoring equipment and algorithm, and the dispensing position groove can be formed by the set positioning screen line and the LCD, so that the glue flows uniformly in the groove and the conditions of too much glue and too little glue are avoided.

Description

Technical Field

[0001] This invention relates to the field of display module technology, and in particular to a method for improving dispensing quality. Background Technology

[0002] In the production of LCD modules, after the FPC is bonded to the LCD, adhesive is often applied at the bonding location to prevent moisture from entering. Therefore, the quality of the adhesive application directly affects the reliability of the LCD module. Common adhesive application methods include manual dispensing and machine dispensing.

[0003] 1. Manual dispensing method: Place the sample to be dispensed on a table with the dispensing side facing upwards (the non-dispensing side should be closer to the table). The dispensing tool is a syringe with a needle, one end of which is connected to an air tube. While dispensing, hold the syringe (needle downwards) with one hand, bringing the needle close to the dispensing location. With the other hand, move the sample at a constant speed to form a continuous strip of adhesive with uniform width and thickness in the bonding area. The quality of the dispensing (too little adhesive, too much adhesive) is affected by factors such as air pressure, moving speed, and adhesive viscosity. Too little adhesive will result in exposed bonding areas, posing a risk of moisture ingress; too much adhesive will result in insufficient sealing width, thus affecting the product structure.

[0004] 2. Machine Dispensing Method: The product to be dispensed is fixed on the platform with the dispensing surface facing down, ensuring the dispensing area is unobstructed. The dispensing tool is a syringe with a needle, one end of which is connected to an air tube. During dispensing, pressure is applied to the syringe to inject the adhesive into the bonding area, while the needle is moved at a constant speed, thus forming a continuous section of adhesive with uniform width and thickness in the bonding area. The quality of dispensing (too little adhesive, too much adhesive) is affected by factors such as air pressure, moving speed, and adhesive viscosity. Too little adhesive will result in exposed bonding areas, posing a risk of moisture ingress; too much adhesive will result in insufficient sealing width, thus affecting the product structure.

[0005] Whether using manual or machine dispensing methods, controlling the flow of adhesive on the FPC during the dispensing process is difficult. This can easily lead to situations where some areas have excessive adhesive overflowing while others have insufficient adhesive. Furthermore, subsequent inspection is necessary to ensure dispensing quality. Current inspection methods involve placing the product under a microscope and moving the platform to visually inspect it. This method is inefficient and prone to misjudgment.

[0006] Therefore, existing technologies have shortcomings and need to be improved. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for improving dispensing quality.

[0008] The technical solution of the present invention is as follows: The present invention provides a method for improving dispensing quality, comprising the following steps: Step 1: Determine the optimal glue flow rate and dispensing time; Step 2: Set the dispensing equipment to dispense the display module product according to the optimal glue flow rate and dispensing time; Step 3: Monitor the glue flow rate and dispensing time. When both the glue flow rate and dispensing time are within a suitable range, it is considered qualified; otherwise, it is unqualified; Step 4: Take a picture of the display module product after dispensing using a CCD camera, and use a visual algorithm to detect whether there are any problems with the dispensing.

[0009] Furthermore, in step 1, the glue is dispensed at a fixed flow rate first, and then the quality of the glue is judged by human visual inspection, thereby determining the optimal glue flow rate and dispensing time.

[0010] Furthermore, in step 4, the problem with dispensing is insufficient glue or glue overflowing onto the positioning silkscreen lines of the module FPC of the display module.

[0011] Furthermore, the color of the selected adhesive is different from and not similar to the color of the positioning silkscreen lines on the module FPC.

[0012] Furthermore, the height of the positioning silkscreen line is 0.1 mm.

[0013] The beneficial effects of the present invention by adopting the above solution are as follows: by monitoring the glue flow rate and dispensing time during the dispensing process, quantitative monitoring of dispensing quality can be achieved; with the help of visual monitoring equipment and algorithms, automatic monitoring of dispensing quality can be achieved; the set positioning silk screen line can work together with the LCD to form a groove at the dispensing position, so that the glue flows evenly in the groove, avoiding the occurrence of too much glue or too little glue. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the positioning silkscreen lines of the display module of the present invention. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the positioning silkscreen lines of the display module of the present invention. Figure 2 . Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Please see Figure 1In this embodiment, the present invention provides a method for improving dispensing quality, comprising the following steps: Step 1: Determine the optimal glue flow rate and dispensing time; Step 2: Set the dispensing equipment to dispense the display module product according to the optimal glue flow rate and dispensing time; Step 3: Monitor the glue flow rate and dispensing time. If both the glue flow rate and dispensing time are within a suitable range, it is considered qualified; otherwise, it is unqualified; Step 4: Take a picture of the display module product after dispensing using a CCD camera, and use a visual algorithm to detect whether there are problems with the dispensing. If there are problems, the dispensing is unqualified.

[0018] Furthermore, in step 1, by first setting a fixed flow rate for dispensing, and then judging the dispensing quality by human visual inspection, the optimal glue flow rate and dispensing time are determined. In the calculation: glue flow rate * dispensing time = amount of glue used (flow rate) during dispensing.

[0019] Furthermore, in step 4, the problem with the adhesive dispensing is insufficient adhesive or adhesive overflow onto the positioning silkscreen line 21 of the FPC 2 module of the display module. In this solution, the display module includes LCD 1 and the FPC 2 module bonded to the LCD. The height of the positioning silkscreen line 21 can be 0.1mm, and the position of the positioning silkscreen line 21 can be set according to the width of the adhesive dispensing. The positioning silkscreen line 21 can be created during the silkscreening of characters on the FPC 2 module. The amount of adhesive used is: dispensing width (the dimension from the corresponding edge of LCD 1 to the edge of the positioning silkscreen line 21) * dispensing length * height of the positioning silkscreen line. Since the positioning silkscreen line 21 has a certain height, it can work together with the LCD 1 to form a groove at the dispensing position. This groove limits the position of the adhesive, preventing it from overflowing and ensuring even flow within the groove. This avoids situations where there is too much or too little adhesive. In actual operation, the amount of adhesive used during dispensing can be appropriately increased (the specific calculation method for the increased amount of adhesive is: 1 / 2 * A (the dimension from the corresponding edge of the LCD 1 to the edge of the positioning silkscreen line 21) * B (the upper limit allowed) * dispensing length, see...). Figure 2 This ensures that the glue covers the surface evenly and fully, thus achieving a good protective effect.

[0020] Furthermore, the color of the selected adhesive is different from and not similar to the color of the positioning silkscreen line 21 of the module FPC 2, which has a large contrast and facilitates the improvement of detection accuracy during subsequent photo inspection.

[0021] In summary, the beneficial effects of this solution are as follows: by monitoring the glue flow rate and dispensing time during the dispensing process, quantitative monitoring of dispensing quality can be achieved; with the help of visual monitoring equipment and algorithms, automatic monitoring of dispensing quality can be achieved; the set positioning silkscreen lines can work together with the LCD to form a groove at the dispensing position, so that the glue flows evenly in the groove, avoiding the occurrence of excessive or insufficient glue.

[0022] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for improving dispensing quality, used in the production process of a liquid crystal display module, to improve the dispensing quality at the connection edge between the FPC and the LCD after bonding the FPC to the LCD, characterized in that... It includes the following steps: Step 1: Determine the optimal glue flow rate and dispensing time; Step 2: Set the dispensing equipment according to the optimal glue flow rate and dispensing time to perform dispensing on display module products; Step 3: Monitor the glue flow rate and dispensing time, and judge that it is qualified when both the glue flow rate and the dispensing time are within the appropriate range, otherwise it is unqualified; Step 4: Take photos of the display module products after dispensing with a CCD camera, and detect whether there is any problem with dispensing through a visual algorithm; for the situation of dispensing problems such as insufficient glue or glue overflowing beyond the module FPC of the display module, positioning silk screen lines are provided on the module FPC, and the provided positioning silk screen lines and the LCD act together to form a groove at the dispensing position; the glue consumption during dispensing is increased.

2. The method for improving dispensing quality according to claim 1, characterized in that, In said Step 1, dispensing is performed by setting a fixed flow rate first, and then the dispensing quality is judged manually by naked eyes, so as to determine the optimal glue flow rate and dispensing time.

3. The method for improving dispensing quality according to claim 1, characterized in that, The color of the selected glue is different and not similar to the color of the positioning silk screen line of the module FPC.

4. The method for improving dispensing quality according to claim 1, characterized in that, The height of said positioning silk screen line is 0.1mm.

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