Device and method for detecting connection effect of touch screen conductive adhesive

Abstract

The invention relates to a touch screen conductive adhesive connection effect detection device and method, the touch screen conductive adhesive connection effect detection device comprises a vacuum tank with an opening at one end, a cover body assembly, a support, a vacuum pump and a control panel, the vacuum tank is internally provided with a plurality of pairs of test connection lines; the cover body assembly can be connected to an opening of the vacuum tank in a sealed mode, and the vacuum pump, the cover body assembly and the vacuum tank are all arranged on the support. The control panel is electrically connected with the test connecting line and the vacuum pump. According to the device and method for detecting the connection effect of the touch screen conductive adhesive, the touch screen assembly to be detected is put into the detection device capable of forming vacuum, whether the connection effect of the touch screen conductive adhesive is qualified or not is determined by detecting the resistivity change of the touch screen assembly before and after the test, and the efficiency is much higher than that of a traditional method; and the detection efficiency and the product research and development efficiency are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary equipment for touch screen production, and particularly to a device and method for detecting the connection effect of conductive adhesive for touch screens. Background Art

[0002] The upper layer circuit of a five-wire resistive touch screen is connected to the lower layer circuit through low-temperature conductive adhesive. The reliability of the low-temperature conductive adhesive connection is mainly affected by the medium to be connected and the connection area.

[0003] Currently, the upper and lower layer circuit media for connecting low-temperature conductive adhesive are silver wires and carbon wires. Therefore, there are generally two ways to connect the upper and lower layer circuits: upper layer circuit silver wire + low-temperature conductive adhesive + lower layer circuit silver wire, upper layer circuit carbon wire + low-temperature conductive adhesive + lower layer circuit silver wire. There are certain differences in the adhesion performance between silver wires and carbon wires and low-temperature conductive adhesive. The larger the designed area of the conductive adhesive, the better the adhesion performance. On the contrary, the adhesion performance is worse. However, limited by the product size, the designed area of the conductive adhesive cannot be infinitely enlarged.

[0004] When developing new products, it is necessary to verify the connection reliability of the conductive adhesive of the product. The industry method is to use high-temperature and high-humidity tests and thermal shock tests for verification. However, the disadvantage of this verification method is that the sample test verification takes a long time, usually two weeks. And since the situation of sample verification failure often occurs, it is necessary to remanufacture the sample and re-verify the sample, which greatly increases the R & D cycle and thus causes customer complaints. Summary of the Invention

[0005] Based on this, it is necessary to provide a device and method for detecting the connection effect of conductive adhesive for touch screens in view of at least one of the above-mentioned problems.

[0006] In a first aspect, the present invention provides a device for detecting the connection effect of conductive adhesive for touch screens, including a vacuum tank with an open end, a cover assembly, a bracket, a vacuum pump, and a control panel. A plurality of pairs of test connection lines are arranged inside the vacuum tank; the cover assembly can be hermetically connected to the opening of the vacuum tank, and the vacuum pump, the cover assembly, and the vacuum tank are all arranged on the bracket; the control panel is electrically connected to the test connection lines and the vacuum pump respectively.

[0007] In certain implementation manners of the first aspect, the vacuum tank is horizontally placed on the bracket, and one end of the test connection line is suspended inside the tank body of the vacuum tank.

[0008] Combining the first aspect and the above implementation manners, in certain implementation manners of the first aspect, the cover assembly includes a cover body, a connection seat, and a support arm. The connection seat is arranged on the bracket, the first end of the support arm is hinged to the connection seat, and the second end of the support arm is connected to the cover body.

[0009] Combined with the first aspect and the above implementation manner, in some implementation manners of the first aspect, a clamping structure matching the outer peripheral side of the cover body is provided at the opening of the vacuum tank, a rotating handle is provided on the central axis of the cover body, and the rotating handle is pivotally connected to the second end of the support arm.

[0010] Combined with the first aspect and the above implementation manner, in some implementation manners of the first aspect, the control panel is arranged above the vacuum tank.

[0011] In a second aspect, the present invention provides a method for detecting the connection effect of a touch screen conductive adhesive, which uses the touch screen conductive adhesive connection effect detection device described in any one of the first aspects of the present invention, and includes the following steps:

[0012] Put the touch screen component to be tested into the vacuum tank through the opening of the vacuum tank and connect it to the test connection line;

[0013] Seal the vacuum tank, start the vacuum pump, and form and maintain a vacuum environment in the vacuum tank;

[0014] Detect the resistance change of the touch screen component to be tested through the test connection line to determine the connection effect of the touch screen conductive adhesive.

[0015] In some implementation manners of the second aspect, in the step of forming and maintaining a vacuum environment in the vacuum tank, the vacuum environment is a vacuum degree of 0.6 Mpa, and the maintaining time is 1 hour.

[0016] Combined with the second aspect and the above implementation manner, in some implementation manners of the second aspect, the step of determining the connection effect of the touch screen conductive adhesive includes:

[0017] Determine the resistance change degree of the touch screen component to be tested. When the resistance change degree is less than or equal to 10%, the connection effect of the touch screen component to be tested is qualified.

[0018] The technical solutions provided in the embodiments of the present invention bring the following beneficial technical effects:

[0019] The touch screen conductive adhesive connection effect detection device and method provided by the present invention put the touch screen component to be tested into a detection device that can form a vacuum, and determine whether the connection effect of the touch screen conductive adhesive therein is qualified by detecting the resistivity change of the touch screen component before and after the test. The efficiency is much higher than that of the traditional method, and the detection efficiency and product R & D efficiency are greatly improved.

[0020] Additional aspects and advantages of the present application will be given in the subsequent parts, and will be understood in detail from the subsequent description, or learned through the specific implementation of the present invention. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the first - perspective planar structure of a detection device for the connection effect of a touch - screen conductive adhesive in an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the first - perspective planar structure of a detection device for the connection effect of a touch - screen conductive adhesive in an embodiment of the present invention;

[0023] Figure 3 It is a schematic flowchart of a method for detecting the connection effect of a touch - screen conductive adhesive in an embodiment of the present invention.

[0024] Description of the Reference Numerals:

[0025] 100 - vacuum tank, 200 - cover assembly, 300 - bracket, 400 - vacuum pump, 500 - control panel, 600 - test connection line;

[0026] 210 - cover body, 220 - connection base, 230 - support arm, 211 - rotating handle. Detailed Description of the Embodiments

[0027] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The possible embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments already described in the drawings herein. The embodiments described by referring to the drawings are exemplary and are used to make the understanding of the disclosure of the present invention more thorough and comprehensive, and should not be construed as a limitation of the present invention. In addition, if the detailed description of the known technology is not necessary for showing the features of the present invention, these technical details may be omitted.

[0028] Those skilled in the relevant art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the technical field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood as having a meaning consistent with the meaning in the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0029] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of this application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that the phrase "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0030] The following will specifically describe the technical solution of the present invention and how this technical solution solves the above technical problems with specific embodiments.

[0031] An embodiment of the first aspect of the present invention provides a detection device for the connection effect of a touch screen conductive adhesive, as Figure 1 and Figure 2 shown, which includes a vacuum tank 100 with an open end, a cover body assembly 200, a bracket 300, a vacuum pump 400 and a control panel 500. A number of pairs of test connection lines 600 are arranged in the vacuum tank 100; the cover body assembly 200 can be hermetically connected to the opening of the vacuum tank 100, and the vacuum pump 400, the cover body assembly 200 and the vacuum tank 100 are all arranged on the bracket 300; the control panel 500 is electrically connected to the test connection lines 600 and the vacuum pump 400 respectively.

[0032] The detection device for the connection effect of the touch screen conductive adhesive provided by the present invention is mainly a vacuum device, specifically including a vacuum tank 100, a cover body assembly 200 and a bracket 300, etc. Among them, the cover body assembly 200 can be hermetically connected to the vacuum tank 100 to seal or open the opening capable of placing the touch screen assembly. At the same time, the test connection lines 600 are arranged on the tank body of the vacuum tank 100 to realize the electrical connection inside and outside the vacuum tank 100, so as to realize the detection of the electrical parameters of the touch screen assembly in a vacuum environment. By detecting the change of the electrical performance of the touch screen assembly under normal pressure environment and vacuum environment, it is judged whether the connection effect of the touch screen conductive adhesive in the touch screen assembly meets the requirements. This device can quickly detect the connection effect and greatly improve the verification efficiency of the touch screen assembly process.

[0033] Specifically, in some implementation manners of the embodiment of the first aspect of the present invention, as Figure 2As shown, the vacuum tank 100 is placed horizontally on the bracket 300, and one end of the test connection line 600 is suspended in the tank body of the vacuum tank 100. By placing the vacuum tank 100 horizontally, it is convenient to suspend the test connection line 600 in the tank body of the vacuum tank 100, and it is also possible to suspend the touch screen assembly during testing. Even if there are multiple touch screen assemblies being tested at the same time, they can be tested without interfering with each other. The touch screen assembly does not contact the vacuum tank 100, and the vacuum tank 100 is prevented from interfering with the electrical performance of the touch screen assembly. Of course, placing the vacuum tank 100 vertically, setting an insulating placement platform in the vacuum tank 100, and placing the touch screen assembly to be tested on it without interfering with each other is also a feasible way.

[0034] Specifically, in combination with the embodiment of the first aspect and the above implementation, in other implementations, such as Figure 1 As shown, the cover assembly 200 includes a cover 210, a connecting seat 220 and a support arm 230. The connecting seat 220 is disposed on the bracket 300, a first end of the support arm 230 is hinged on the connecting seat 220, and a second end of the support arm 230 is connected to the cover 210.

[0035] Optionally, in combination with the embodiment of the first aspect and the above implementation, in some other implementations, such as Figure 2 As shown, a snap-fit ​​structure matching the outer circumference of the cover 210 is provided at the opening of the vacuum tank 100, and a rotating handle 211 is provided on the central axis of the cover 210, and the rotating handle 211 is pivotally connected to the second end of the support arm 230. A snap-fit ​​structure is provided at the opening of the vacuum tank 100, and when the cover 210 is rotated to a certain angle, the cover 210 is attached to the vacuum tank 100, and then rotated, the two can be snapped together and will not be separated. When removing the cover 210, the cover 210 is first rotated so that the edge of the cover 210 is separated from the obstruction of the snap-fit ​​structure, and then the cover 210 is removed along the axial direction of the vacuum tank 100. Of course, the snap-fit ​​structure can also adopt a threaded structure, and a matching threaded structure is provided at the opening edge of the vacuum tank 100 and the outer circumference of the cover 210.

[0036] Optionally, in combination with the first aspect and the above implementations, in some implementations of the first aspect, such as Figure 1 As shown, the control panel 500 is disposed above the vacuum tank 100. The control panel 500 is disposed above the vacuum tank 100, so that the operator can operate the vacuum pump 400 and adjust the vacuum degree and holding time in the vacuum tank 100 after closing the vacuum tank 100.

[0037] Based on the same technical concept, an embodiment of the second aspect of the present invention provides a method for detecting the connection effect of a conductive adhesive on a touch screen, using a device for detecting the connection effect of a conductive adhesive on a touch screen as described in any one of the first aspects of the present invention. Figure 3As shown, the following steps are included:

[0038] S100 : placing the touch screen assembly to be tested into the vacuum tank 100 through the opening of the vacuum tank 100 , and connecting it to the test connection line 600 .

[0039] S200: The vacuum tank 100 is sealed, and the vacuum pump 400 is started to form and maintain a vacuum environment in the vacuum tank 100. Specifically, the vacuum environment has a vacuum degree of 0.6 MPa and is maintained for 1 hour.

[0040] S300: Detect the resistance change of the touch screen component to be tested through the test connection line 600 to determine the connection effect of the touch screen conductive glue. Specifically, the determination step includes: determining the resistance change of the touch screen component to be tested, when the resistance change is less than or equal to 10%, the connection effect of the touch screen component to be tested is qualified.

[0041] The device and method for detecting the connection effect of the conductive adhesive of the touch screen provided by the present invention place the touch screen component to be tested into a detection device that can form a vacuum, and determine whether the connection effect of the conductive adhesive of the touch screen is qualified by detecting the resistivity change of the touch screen component before and after the test. The efficiency is much higher than that of the traditional method, and the detection efficiency and product development efficiency are greatly improved.

[0042] The following are specific embodiments:

[0043] See also Figure 1 and Figure 2 The vacuum device includes a steel can-shaped container, namely, a vacuum tank 100, and a matching lid. The vacuum tank 100 is provided with an opening, which is surrounded by a sealing ring, and is convenient for the operator to put the test sample into the vacuum tank 100 through the opening. There is a rotatable door above the opening, which is connected to the vacuum tank 100 through a connector and a rotating shaft. The size of the lid is generally larger than the size of the opening. When the lid is opened, it can cover the opening and the sealing ring of the vacuum tank 100 to achieve sealing. The lid is connected to a rotating handle 211. Rotating the rotating handle 211 can clamp the lid into the locking device connected to the tank body. When the lid needs to be opened, the rotating handle on the lid can be rotated in the opposite direction to disengage the lid from the locking device.

[0044] There is also an opening on the vacuum tank 100 for connecting the vacuum pumping pipeline. The pipeline with a sealing ring at the connection is hermetically connected to the vacuum tank 100. An explosion-proof connector is installed on the vacuum tank 100, and its outer shell is hermetically connected to the vacuum tank 100 (with a sealing ring). At one end of the explosion-proof connector inside the container, a connecting wire is installed, and at the other end of the connecting wire, an electrical connection clip is connected for clamping the internal test sample. The external part of the connector is connected with a connecting wire for connecting to an external instrument. This explosion-proof connector is the test connecting wire 600. To ensure the corrosion resistance of the vacuum tank 100, the outer surface of the tank body should be galvanized and coated with anti-corrosion paint.

[0045] The electrical control system consists of a control panel 500, a control circuit, a vacuum pipeline, a vacuum pump 400, etc. The control panel 500 is used to operate the test device. It is provided with operation buttons and vacuum degree and time control devices. The vacuum degree control device can set and display the vacuum degree inside the container, and the time control device can set and display the time to control the vacuum pumping time. The control circuit can enable the vacuum pump 400 to pump vacuum for the vacuum container. One end of the vacuum pipeline is connected to the vacuum container, and the other end is connected to the vacuum pump 400. The control panel 500 can also integrate a test device, such as a resistance test device. Connect the control panel 500 to the test connecting wire 600, and the resistance of the touch screen component can be tested through the resistance test device in the control panel 500.

[0046] Test method:

[0047] Prepare samples that have passed the appearance and electrical performance inspections. Connect the FPC end of the product to the connection clip of the corresponding test connecting wire 600, put the product into the vacuum tank 100, and cover and lock the cover body 210. Connect the test leads of the multimeter to the exposed connecting wire of the explosion-proof connector and measure the resistance value R1 of the product.

[0048] Turn on the power of the vacuum equipment through the control panel 500, and set the vacuum degree to 0.6 Mpa and the test time to 1 hour.

[0049] Start the equipment. The vacuum pump 400 starts to work, and the vacuum degree control device starts to detect the vacuum degree inside the vacuum tank 100. When the vacuum degree reaches the set value, the vacuum pump 400 stops working, and the time control device starts to count. When the counting time reaches the set value, for the resistive touch screen, since the two layers of circuits are bonded together by a circular double-sided adhesive, the air sealed between the two layers of circuits forms a large pressure difference with the external space of the product, resulting in a pulling force for the two layers of circuits to break away from the bondage of the double-sided adhesive. After this pulling force lasts for a period of time, the conductive adhesive in the double-sided adhesive will also be affected by this pulling force, and the degree of this influence directly reflects the connection reliability of the conductive adhesive.

[0050] Observe the resistance value R2 shown on the multimeter (the resistance value of the conductive adhesive loop). When the ratio (in percentage) of the absolute value obtained by R2 - R1 to R1 is greater than 10%, it indicates that the connection reliability of the conductive adhesive of the product fails. When the ratio does not exceed 10%, it indicates that the connection of the conductive adhesive of the product is reliable.

[0051] Those skilled in the art of this technology can understand that the steps, measures, and solutions in various operations, methods, and processes discussed in this application can be alternated, changed, combined, or deleted. Further, other steps, measures, and solutions in various operations, methods, and processes discussed in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and solutions in the prior art that are the same as those disclosed in various operations, methods, and processes in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0052] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0053] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0054] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0055] It should be understood that although the steps in the flowchart of the accompanying drawings are shown sequentially according to the indication of the arrows, these steps are not necessarily executed sequentially according to the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit and can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same moment but can be executed at different moments, and their execution order is not necessarily sequential but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

[0056] The above are only some embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A device for detecting the connection effect of conductive adhesive of a touch screen, characterized in that: It comprises a vacuum tank with an opening at one end, a cover assembly, a bracket, a vacuum pump and a control panel, wherein a plurality of pairs of test connection wires are arranged in the vacuum tank; the cover assembly can be sealed and connected to the opening of the vacuum tank, and the vacuum pump, the cover assembly and the vacuum tank are all arranged on the bracket; the control panel is electrically connected to the test connection wires and the vacuum pump respectively.

2. The device for detecting the connection effect of the conductive adhesive of the touch screen according to claim 1, characterized in that: The vacuum tank is placed horizontally on the bracket, and one end of the test connection line is suspended in the tank body of the vacuum tank.

3. The device for detecting the connection effect of the conductive adhesive of the touch screen according to claim 1, characterized in that: The cover assembly comprises a cover, a connecting seat and a supporting arm, wherein the connecting seat is arranged on the bracket, a first end of the supporting arm is hinged on the connecting seat, and a second end of the supporting arm is connected to the cover.

4. The device for detecting the connection effect of the conductive adhesive of the touch screen according to claim 3, characterized in that: The opening of the vacuum tank is provided with a snap-fit ​​structure matching the outer peripheral side of the cover body, and a rotating handle is provided on the central axis of the cover body, and the rotating handle is pivotally connected to the second end of the support arm.

5. The device for detecting the connection effect of the conductive adhesive of the touch screen according to claim 1, characterized in that: The control panel is arranged above the vacuum tank.

6. A method for detecting the connection effect of a touch screen conductive adhesive, characterized in that: The device for detecting the connection effect of the conductive adhesive of a touch screen according to any one of claims 1 to 5 comprises the following steps: Putting the touch screen assembly to be tested into the vacuum tank through the opening of the vacuum tank and connecting it to the test connection line; The vacuum tank is sealed, and the vacuum pump is started to form and maintain a vacuum environment in the vacuum tank; The resistance change of the touch screen component to be tested is detected through the test connection line to determine the connection effect of the touch screen conductive glue.

7. The method for detecting the connection effect of the conductive adhesive of the touch screen according to claim 6, characterized in that: In the step of forming and maintaining a vacuum environment in the vacuum tank, the vacuum environment has a vacuum degree of 0.6 MPa and is maintained for 1 hour.

8. The method for detecting the connection effect of the conductive adhesive of the touch screen according to claim 6, characterized in that: The step of determining the connection effect of the conductive adhesive of the touch screen includes: The resistance variation of the touch screen assembly to be tested is determined. When the resistance variation is less than or equal to 10%, the connection effect of the touch screen assembly to be tested is qualified.

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