Open circuit detection method, device and equipment for touch film
By collecting and comparing the induction data of the electrode block on the touch film, and controlling the grounding of other electrode blocks to simulate human finger touch, the problem of inaccurate test results caused by relying on test fixtures in the prior art is solved, and a more accurate and simplified open circuit detection of the touch film is achieved.
Patent Information
- Application Number
- CN202411974257.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-05-06
AI Technical Summary
The open circuit detection method of touch film in the prior art relies heavily on test fixtures, which can easily lead to inaccurate test results.
By collecting induction data of each electrode block on the basis of at least one contact surface on the touch film, the induction data of each electrode block is collected, and by controlling the grounding of other electrode blocks, it simulates touching of a human finger, thereby collecting induction data of each electrode block on the touch film, and comparing with the qualified threshold range, abnormal electrode blocks are selected.
This method no longer relies on test fixtures, saves rubber pressing operation, reduces the complexity of testing, saves production testing time, and ensures the accuracy of test results.
Smart Images
Figure CN119936736A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electronic touch products, and in particular to a method, device and equipment for detecting an open circuit of a touch film. Background Art
[0002] The technology iteration of capacitive touch pens has developed very quickly, from simple passive capacitive pens to more sensitive active capacitive pens, to active capacitive pens with touch function, and finally to active capacitive pens with both touch and pressure sensing functions. Among them, the touch function and pressure sensing function need to be realized through the touch film inside the pen. By realizing a multifunctional touch pen, the user's product interaction experience is improved.
[0003] At present, the open circuit test of the touch film in the capacitive touch pen generally needs to be implemented in conjunction with a rubber test fixture. Specifically, the test process requires the cooperation of the host computer and the test fixture. First, the product to be tested (the product to be tested can be a touch film, a semi-finished product of a touch pen, or a finished touch pen) is placed in the test fixture. The host computer controls the test fixture to use the test rubber to press the touch product to simulate the touch of a human finger, and then analyzes the open circuit of the touch film by collecting the touch data after pressing.
[0004] During the whole process, the product to be tested must be pressed with the test fixture, but during the pressing process, it is necessary to pay attention to the pressing loss of the test rubber in real time, otherwise it is likely to cause inaccurate open circuit test results; and if the semi-finished product of the touch pen is tested, due to the lack of a pen shell, it is difficult for the test rubber to be pressed well with the touch film, in this case it is also easy to cause inaccurate open circuit test results.
[0005] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:
[0006] The traditional open circuit detection method of touch film is extremely dependent on the test fixture, which can easily lead to inaccurate test results. Summary of the invention
[0007] The purpose of the present invention is to provide a touch film open circuit detection method, device and equipment to solve the technical problem that the conventional touch film open circuit detection method in the prior art is extremely dependent on the test fixture, which easily leads to inaccurate test results. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.
[0008] To achieve the above object, the present invention provides the following technical solutions:
[0009] The present invention provides a method for detecting an open circuit of a touch film, wherein the touch film comprises at least one contact surface, each of the contact surfaces comprises at least one electrode block, and the method comprises the following steps: S100, whenever sensing data of a target electrode block on the contact surface is collected, controlling the other electrode blocks except the target electrode block to be grounded until all electrode blocks on the contact surface are traversed to obtain sensing data of each electrode block on the touch film; S200, judging whether the sensing data of each electrode block is within a qualified threshold range; S300, if the sensing data of each electrode block is not within the qualified threshold range, confirming that the touch film is abnormal.
[0010] Optionally, the method further includes: S400, if the sensing data of each electrode block is within a qualified threshold range, confirming that the touch film passes the detection.
[0011] Optionally, step S100 can be replaced by step S500: S500, when the number of contact surfaces of the touch film is greater than 1, whenever the sensing data of the current contact surface is collected, the other contact surfaces except the current contact surface are controlled to be grounded until all the contact surfaces are traversed to obtain the sensing data of each contact surface on the touch film; the sensing data of the contact surface is the sensing data of all electrode blocks on the contact surface.
[0012] Optionally, step S500 includes: on the current contact surface, scanning all electrode blocks on the current contact surface by means of a touch chip to obtain sensing data of the current touch surface, and then scanning all electrode blocks on the next touch surface until all contact surfaces are scanned to obtain sensing data of each contact surface on the touch film.
[0013] Optionally, step S100 includes: S101, on the current contact surface, scanning the current electrode block once with the touch chip to obtain the sensing data of the current electrode block, and then scanning the next electrode block of the current electrode block once to obtain the sensing data of the next electrode block, until all the electrode blocks on the current contact surface are scanned to obtain the sensing data of each electrode block on the current contact surface; S102, all the contact surfaces obtain the sensing data of each electrode block on the touch film according to the scanning steps of the current contact surface.
[0014] Optionally, step S102 includes: after scanning the sensing data of each electrode block of the current contact surface in a set order, scanning the sensing data of each electrode block of the next contact surface until all electrodes of the contact surfaces are traversed to obtain the sensing data of each electrode block on the touch film.
[0015] Optionally, whenever the sensing data of a target electrode block on the contact surface is collected, or the number of contact surfaces of the touch film is greater than 1, whenever the sensing data of the current contact surface is collected, the touch chip controls the grounding of the other electrode blocks except the target electrode block, or controls the grounding of the other contact surfaces except the current contact surface.
[0016] Optionally, for collecting the electrode block at the same position of the same touch film, if the electrode block is abnormal, the sensing data collected by using step S100 is larger than the sensing data collected by using step S500.
[0017] A touch film open circuit detection device comprises a touch film and a touch chip, wherein the touch film is electrically connected to the touch chip, and the touch chip is used to execute any one of the above touch film open circuit detection methods.
[0018] A touch film open circuit detection device, comprising:
[0019] one or more processors;
[0020] A memory for storing one or more computer programs, wherein one or more processors are used to execute the one or more computer programs stored in the memory, so that the one or more processors execute the touch film open circuit detection method as described in any one of the above
[0021] Implementing one of the above technical solutions of the present invention has the following advantages or beneficial effects:
[0022] Whenever the present invention collects the sensing data of the electrode block on the contact surface, the other electrode blocks are controlled to be grounded, so that the touch film can be driven to simulate the touch of a human finger, so that the electrode block to be detected can generate a capacitance change even without rubber pressing. In this way, the sensing data of each electrode block on the touch film is collected, and then compared with the qualified threshold, so as to screen out the electrode blocks with open circuits on the touch film; the present invention no longer relies on a test fixture, omits the operation of rubber pressing, reduces the complexity of the test, saves production test time, and can also ensure the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. It is obvious that 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 work. In the drawings:
[0024] Figure 1 is a flow chart of a touch film open circuit detection method according to a first embodiment of the present invention;
[0025] Figure 2 1 is a flow chart of step S100 of a touch film open circuit detection method according to an embodiment of the present invention. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the present invention clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the present invention are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, devices, etc. that are consistent with some aspects of the present disclosure as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the present invention.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0028] In order to illustrate the technical solution of the present invention, a specific embodiment is used below for description, and only the parts related to the embodiment of the present invention are shown.
[0029] Embodiment 1:
[0030] like Figure 1As shown, the present invention provides an open circuit detection method for a touch film, the touch film comprising a plurality of contact surfaces, each contact surface comprising at least one electrode block, the method comprising the following steps: S100, whenever the sensing data of a target electrode block on a contact surface is collected, the other electrode blocks except the target electrode block are controlled to be grounded until all the electrode blocks on the contact surfaces are traversed to obtain the sensing data of each electrode block on the touch film; S200, judging whether the sensing data of each electrode block is within a qualified threshold range; S300, if the sensing data of each electrode block is not within the qualified threshold range, confirming that the touch film is abnormal; S400, if the sensing data of each electrode block is within the qualified threshold range, confirming that the touch film passes the detection.
[0031] The touch film open circuit detection method provided in the present embodiment is applied to the open circuit detection of touch electronic products, and is particularly applied to the open circuit detection of the touch film of a touch pen; whenever the sensing data of the electrode block on the contact surface is collected, the other electrode blocks are controlled to be grounded, so that the touch film can be driven to simulate the touch of a human finger, so that the electrode block to be detected can generate a capacitance change even without rubber pressing. In this way, the sensing data of each electrode block on the touch film is collected, and then compared with the qualified threshold, so as to screen out the electrode blocks with open circuits on the touch film; the present embodiment no longer relies on the test fixture, omits the rubber pressing operation, reduces the complexity of the test, saves the production test time, and can also ensure the accuracy of the test results.
[0032] The method of this embodiment controls the grounding of other electrode blocks except the target electrode block through the touch chip, and also scans the sensing data of each electrode block on the touch film through the touch chip. An open circuit detection mode can be set for the touch chip, such as sending a command to the touch chip through the main control to make the touch chip enter the open circuit detection mode. In this mode, the touch chip will adjust the scanning method of the electrode block. When scanning the electrode block on a certain detection area, it will modify the configuration of the electrode blocks on other detection areas, so that the other electrode blocks are grounded. This will also change the capacitance of the electrode blocks on the detection area to be scanned, thereby generating sensing data. Similarly, after scanning each detection area, the sensing data of all electrode blocks can be obtained.
[0033] As an alternative embodiment, Figure 2As shown, step S100 includes: S101, on the current contact surface, the current electrode block is scanned once by the touch chip to obtain the sensing data of the current electrode block, and the next electrode block of the current electrode block is scanned again to obtain the sensing data of the next electrode block, until all the electrode blocks on the current contact surface are scanned to obtain the sensing data of each electrode block on the current contact surface; S102, all contact surfaces follow the scanning steps of the current contact surface to obtain the sensing data of each electrode block on the touch film. When scanning one electrode block, all other electrode blocks are controlled to be grounded, so that after scanning each electrode block on the touch film in turn, the sensing data of all electrode blocks can be obtained. Only one electrode block is scanned at a time, and each electrode block will not interfere with each other, so that higher-precision sensing data can be obtained.
[0034] Further, step S102 includes: after scanning the sensing data of each electrode block of the current contact surface in a set order, scanning the sensing data of each electrode block of the next contact surface, until all electrodes of the contact surfaces are traversed to obtain the sensing data of each electrode block on the touch film. When there is more than one contact surface, the electrode block on the next contact surface is also scanned according to the same scanning method, so that high-precision sensing data on each contact surface can be obtained.
[0035] Taking the double-sided touch film shown in Table 1 as an example, the touch film includes two contact surfaces, the first contact surface has 36 electrode blocks, numbered 1 to 36; the second contact surface has 12 electrode blocks, numbered 37 to 48; when collecting the sensing data of the electrode block numbered 1, the touch chip controls the electrode blocks numbered 2 to 48 to be grounded by modifying the scanning mode, so that the electrode block numbered 1 will generate a sensing data; similarly, when collecting the sensing data of the electrode block numbered 2, the electrode blocks numbered 1 and 3 to 48 are controlled to be grounded, and the sensing data of the electrode block numbered 2 is obtained, and all the electrode blocks are traversed and detected to obtain the sensing data of all the electrode blocks.
[0036]
[0037] Table 1 Touch film electrode block distribution table
[0038] Depending on the model and parameters of the touch chip, the sensing data generated by the electrode block when the open circuit detection is normal is also different. Assuming that the touch chip used in this embodiment generates sensing data of 5000 when the electrode block is tested normally, due to the influence of environmental factors, the sensing data may fluctuate by 30% above or below. Therefore, the qualified threshold range is set to (3500, 6500). As shown in Table 2, the sensing data of the touch film tested in step S100 is shown in the table. It can be seen from the table that each sensing data is within the qualified threshold range, and the touch film passes the test. As shown in Table 3, the sensing data of the touch film is also tested in step S100. It can be seen from the table that the sensing data of the electrode block numbered 31 is 841, which is obviously less than the lower limit of the qualified threshold range, indicating that there is an open circuit in the electrode block on the touch film and the test fails. This implementation is not limited by the contact surface, and can test a touch film with only one contact surface, and can also test a touch film including multiple test surfaces.
[0039]
[0040]
[0041] Table 2 Test data of the first good touch film
[0042]
[0043] Table 3 Test data of the first non-conforming touch film
[0044] Embodiment 2:
[0045] In this embodiment, step S100 of embodiment 1 can be replaced by step S500: when the number of contact surfaces of the touch film is greater than 1, whenever the sensing data of the current contact surface is collected, the other contact surfaces except the current contact surface are controlled to be grounded until all contact surfaces are traversed to obtain the sensing data of each contact surface on the touch film; the sensing data of the contact surface is the sensing data of all electrode blocks on the contact surface. Different from step S100, this step collects the sensing data of all electrode blocks on one contact surface at a time until all contact surfaces are collected to obtain the sensing data of each electrode block on the touch film, and compares each sensing data with the qualified threshold range. If there is sensing data that is not within the qualified threshold range, it means that the touch film is a defective product.
[0046] Specifically, step S500 includes: on the current contact surface, scanning all electrode blocks on the current contact surface through the touch chip to obtain the sensing data of the current touch surface, and then scanning all electrode blocks on the next touch surface until all contact surfaces are scanned to obtain the sensing data of each contact surface on the touch film. When scanning the current contact surface, the electrode blocks on other contact surfaces are controlled to be grounded, and the sensing data on the entire contact surface can be scanned at one time. The double-sided touch film only needs to be scanned twice to obtain the sensing data of all electrode blocks, which greatly saves scanning time and improves detection efficiency. It should be noted that the steps of this embodiment are applicable to the case where the contact surface of the touch film is greater than one, such as a double-sided touch film or a three-sided touch film of a three-fold screen mobile phone.
[0047] Taking the double-sided touch film shown in Table 1 as an example, when the touch film is applied to a touch pen and assembled with the touch pen, the second contact surface (back side) of the touch film is tightly wrapped on the steel tube core in the touch pen through elastic rubber, while the first contact surface (front side) faces outward, so that human fingers can touch it. When a human finger touches the first contact surface, the capacitance of the electrode block on the first contact surface changes, thereby realizing the touch function; when a human finger exerts pressure on the touch film, the elastic rubber deforms, and the distance between the electrode block on the second contact surface of the touch film and the steel tube core changes, so that the capacitance of the electrode block at the position corresponding to the pressure changes, thereby realizing the pressure sensing function. Therefore, the touch film of this embodiment can be used to realize pressure sensing detection and touch detection.
[0048] Under normal conditions, the touch chip will detect both the first contact surface and the second contact surface of the touch film. When performing open circuit detection, when detecting the electrode block of the first contact surface, the electrode blocks of the second contact surface will be grounded. At this time, it is equivalent to adding a touch surface to the first contact surface of the touch film as a whole, so that the sensing data of all the electrode blocks of the first contact surface can be obtained; similarly, when detecting the electrode block of the second contact surface, the electrode blocks of the first contact surface are grounded. In this way, all the sensing data of the second contact surface can be obtained. By analyzing the changes in the sensing data of the electrode blocks, the open circuit status of each electrode block of the touch film can be known.
[0049] The touch film shown in Table 1 is tested by the method of this embodiment. As shown in Table 4, it is a data table showing that the electrode blocks on the touch film are open-circuited normally, and the qualified threshold range is still set to (3500, 6500). It can be seen from the table that the sensing data are all within the qualified threshold range, indicating that all the electrode blocks are open-circuited normally and passed the test. As shown in Table 5, it is a data table showing that the electrode blocks on the touch film are open-circuited abnormally. It can be seen from the table that the data of the electrode block numbered 31 is 308, which is obviously less than the lower limit of the qualified threshold range, indicating that there is an open circuit in the electrode blocks on the touch film and the test fails. By using the method of this embodiment, abnormal touch films can be quickly screened out.
[0050]
[0051] Table 4 Test data of the second good touch film
[0052]
[0053]
[0054] Table 5 Test data of the second non-conforming touch film
[0055] By comparing the normal data in Table 2 with Table 4, and the abnormal data in Table 3 with Table 5, for a good touch film (i.e., a touch film without an open-circuit electrode block), when the method of Embodiment 1 and this embodiment is used for collection, the sensing data obtained are all within the qualified threshold range. This is because under the current parameters of the touch chip, the capacitance change when a human body touches is about 1.6 pF (generating about 1000 sensing data), while the capacitance change of a normal electrode block is about 8 pF (generating about 5000 sensing data). Therefore, for a good touch film, the sensing data obtained by the method of Embodiment 1 and Embodiment 2 for collection are all about 5000. As for the touch film with open-circuit electrode blocks, since the acquisition step of the first embodiment is the total capacitance change of the first contact surface, the second contact surface and the surrounding of the electrode block, while the acquisition step of this embodiment is only the capacitance change of the first contact surface and the second contact surface, the sensing data collected by the acquisition step of the first embodiment for the abnormal electrode block at the same position is larger than the sensing data collected by the acquisition step of this embodiment; that is, for collecting the electrode block at the same position of the same touch film, if the electrode block is abnormal, the sensing data collected by step S100 is larger than the sensing data collected by step S500; in addition, since the open-circuit electrode block and the wiring have an impact on the capacitance of the normal electrode block, the sensing data of the normal electrode block at the same position will also have a slight change, but this change will not exceed the qualified threshold range and will not affect the detection result. Therefore, both methods can detect abnormal touch films.
[0056] The two implementation methods of Example 1 and this embodiment do not need to rely on a test fixture for pressing. By adding an open circuit scanning mode to the touch chip and configuring an algorithm to realize open circuit detection of the touch film, the production test cost can be reduced; and without cooperating with a test fixture, more time can be saved.
[0057] The embodiment is only a specific example and does not represent only one implementation mode of the present invention.
[0058] Embodiment three:
[0059] Different from the first embodiment and the second embodiment, the present embodiment provides a touch film open circuit detection device, including a touch film and a touch chip, the touch film is electrically connected to the touch chip, and the touch chip is used to perform a touch film open circuit detection method as described in the first embodiment. The device provided by the present embodiment can perform detection without the need for an additional test fixture, saving the operation of rubber pressing, and can achieve touch film open circuit detection by only modifying the algorithm of the touch chip. It can detect not only the touch film of a finished touch pen, but also the touch film of a semi-finished touch pen, and can ensure the accuracy of the test results.
[0060] Embodiment 4:
[0061] The present invention also provides an embodiment of an open circuit detection device for a touch film, comprising one or more processors and a memory; wherein the memory is used to store one or more computer programs, and the one or more processors are used to execute the one or more computer programs stored in the memory, so that the processor executes the features / steps of the above-mentioned embodiment of a method for detecting an open circuit of a touch film.
[0062] The above description is only the preferred embodiment of the present invention. It is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.
Claims
1. A method for detecting an open circuit of a touch film, characterized in that: The touch film comprises at least one contact surface, each of which comprises at least one electrode block, and the method comprises the following steps: S100, whenever sensing data of a target electrode block on the contact surface is collected, controlling the other electrode blocks except the target electrode block to be grounded until all electrode blocks on the contact surface are traversed to obtain sensing data of each electrode block on the touch film; S200, determining whether the sensing data of each electrode block is within a qualified threshold range; S300: If the sensing data of not every electrode block is within the qualified threshold range, confirm that the touch film is abnormal.
2. The method for detecting an open circuit of a touch film according to claim 1, characterized in that: The method further includes: S400, if the sensing data of each electrode block is within a qualified threshold range, confirming that the touch film has passed the detection.
3. The method for detecting an open circuit of a touch film according to claim 1, characterized in that: Step S100 can be replaced by step S500: S500, when the number of contact surfaces of the touch film is greater than 1, whenever sensing data of the current contact surface is collected, the other contact surfaces except the current contact surface are controlled to be grounded until all the contact surfaces are traversed to obtain sensing data of each contact surface on the touch film; the sensing data of the contact surface is the sensing data of all electrode blocks on the contact surface.
4. The method for detecting an open circuit of a touch film according to claim 3, characterized in that: Step S500 includes: On the current contact surface, all electrode blocks on the current contact surface are scanned by the touch chip to obtain the sensing data of the current touch surface, and then all electrode blocks on the next touch surface are scanned until all the contact surfaces are scanned to obtain the sensing data of each contact surface on the touch film.
5. The method for detecting an open circuit of a touch film according to claim 1, characterized in that: Step S100 includes: S101, on the current contact surface, scanning the current electrode block once by the touch chip to obtain sensing data of the current electrode block, and then scanning the next electrode block of the current electrode block once to obtain sensing data of the next electrode block, until all electrode blocks on the current contact surface are scanned to obtain sensing data of each electrode block on the current contact surface; S102: All the contact surfaces obtain sensing data of each electrode block on the touch film according to the scanning steps of the current contact surface.
6. The method for detecting an open circuit of a touch film according to claim 5, characterized in that: Step S102 includes: According to the set order, after scanning the sensing data of each electrode block of the current contact surface, the sensing data of each electrode block of the next contact surface is scanned until all electrodes of the contact surface are traversed to obtain the sensing data of each electrode block on the touch film.
7. The method for detecting an open circuit of a touch film according to claim 3, characterized in that: Whenever sensing data of a target electrode block on the contact surface is collected, or the number of contact surfaces of the touch film is greater than 1, whenever sensing data of the current contact surface is collected, the touch chip controls the other electrode blocks except the target electrode block to be grounded, or controls the other contact surfaces except the current contact surface to be grounded.
8. The method for detecting an open circuit of a touch film according to claim 3, characterized in that: For collecting the electrode block at the same position of the same touch film, if the electrode block is abnormal, the sensing data collected by step S100 is larger than the sensing data collected by step S500.
9. A touch film open circuit detection device, characterized in that: The invention comprises a touch film and a touch chip, wherein the touch film is electrically connected to the touch chip, and the touch chip is used to execute the open circuit detection method of the touch film according to any one of claims 1 to 8.
10. A touch film open circuit detection device, characterized in that: include: one or more processors; The memory is used to store one or more computer programs, and the one or more processors are used to execute the one or more computer programs stored in the memory, so that the one or more processors execute the open circuit detection method of the touch film according to any one of claims 1 to 8.