CN104714147B - Conductive film detection method and system - Google Patents

Abstract

The invention provides a conductive film detection method, which comprises the following steps: the method comprises the following steps of (1) enabling an active point-reading device to move in a contact mode on a conductive film, wherein the active point-reading device emits electromagnetic signals with fixed frequency; opening a resonant circuit in the contact of the conductive film and the active point reading device, and closing the resonant circuit after the resonant circuit receives the electromagnetic signal and generates a corresponding electric signal; judging the state of the corresponding resonant circuit according to the value of the electric signal, and when the difference between the values of the electric signal between the two resonant circuits is smaller than a signal threshold value, short-circuiting the two resonant circuits; when no electric signal is output from the resonant circuit, the resonant circuit is open. Whether the conductive film has an open circuit or a short circuit or not is tested, the conductive film is tested before and after installation in a traditional mode, and the method only needs to test once after installation, so that the efficiency is improved.

Description

Conductive film detection method and system

technical field

The invention relates to detection technology, in particular to a conductive film detection method and system.

Background technique

At present, the conductive film used in the point reading machine must be tested before and after the machine is assembled. Using a test fixture and a multimeter to detect whether there is an open circuit or a short circuit in the conductive film, and whether the impedance meets the standard is a low-efficiency testing method that affects the entire system. machine production efficiency.

Contents of the invention

Based on this, it is necessary to provide a conductive film detection method that can quickly detect whether there is an open circuit, a short circuit, and whether the impedance of the conductive film meets the standard, and can effectively improve the test efficiency.

The invention provides a method for detecting a conductive film, comprising the following steps:

The active point reading device is contacted and moved on the conductive film, and the active point reading device emits an electromagnetic signal of a fixed frequency;

Open the resonant circuit on the conductive film that is in contact with the active point reading device, and close it after the resonant circuit receives the electromagnetic signal and generates a corresponding electrical signal;

Judging the state of the corresponding resonant circuit according to the value of the electrical signal, when the difference in the value of the electrical signal between the two resonant circuits is less than the signal threshold, the two resonant circuits are short-circuited; If the resonant circuit has no electrical signal output, the resonant circuit is open.

The present invention also provides a conductive thin film detection system, comprising:

An active point-reading device is used for contacting and moving on the conductive film, and the active point-reading device emits an electromagnetic signal of a fixed frequency;

A control module, configured to open the resonant circuit on the conductive film that is in contact with the active point-reading device, and close the resonant circuit after receiving the electromagnetic signal and generating a corresponding electrical signal;

A judging module, configured to judge the state of the corresponding resonant circuit according to the value of the electrical signal, and when the difference in the value of the electrical signal between the two resonant circuits is less than the signal threshold, the two resonant circuits are short-circuited ; When there is no electrical signal output from the resonant circuit, the resonant circuit is open.

Compared with the traditional conductive film detection method, the above-mentioned conductive film detection method and system have at least the following advantages: First, to test whether there is an open circuit or a short circuit in the conductive film, the traditional method must be tested before and after installation. This method only It only needs to be tested once after installation, which improves the efficiency; secondly, the traditional test method requires the help of other instruments or equipment. This method only needs the equipment itself to perform the test, which is more convenient and quick, and saves production costs.

Description of drawings

Fig. 1 is the flow chart of conductive thin film detection method in the preferred embodiment of the present invention;

Fig. 2 is a block diagram of a conductive film detection system in a preferred embodiment of the present invention;

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to Fig. 1, the conductive film detection method in the preferred embodiment of the present invention, needs point reader to start, and enters into specific conductive film detection program interface, method comprises the following steps:

Step S110, contacting and moving the active point reading device on the conductive film, and the active point reading device emits an electromagnetic signal with a fixed frequency.

Specifically, the active point reading device is an active point reading pen. In other embodiments, the active point reading device may have an active stylus that can emit electromagnetic signals, or the like. After the point reader enters the conductive film detection program, press the point reader pen on the panel (conductive film) of the point reader and move slowly along the panel. During this process, after the point reading pen is pressed, the membrane switch on the tip of the point reading pen is opened, an LC circuit is formed on the point reading pen, and an electromagnetic signal of a fixed frequency starts to be emitted to the outside. In this embodiment, the fixed frequency of the electromagnetic signal is a preset frequency, such as 450KHz)

Step S120, opening the resonant circuit on the conductive film that is in contact with the active point-reading device, and closing the resonant circuit after receiving the electromagnetic signal and generating a corresponding electrical signal.

Specifically, open the resonant circuit corresponding to the moving process of the active point reading device in the conductive film. At this time, the resonant circuit starts to receive the electromagnetic signal with a frequency of 450KHz from the point reading pen. This process needs to be kept for a preset time, such as keeping us, the resonant circuit on the conductive film is based on the principle of resonance, and reaches a saturated state and generates an electrical signal. In this embodiment, the resonant circuit is an LC circuit.

The electrical signal on the LC circuit on the conductive film is filtered and amplified, and then output to the analog-to-digital conversion circuit or the analog-to-digital conversion chip, and then the MCU (Micro Control Unit, Micro Control Unit) of the point reader reads the signal on the analog-to-digital conversion circuit. value of the signal, and then close the loop.

Step S130, judging the state of the corresponding resonant circuit according to the value of the electrical signal generated by the LC circuit, when the difference in the value of the electrical signal between the two resonant circuits is less than the signal threshold, the two resonant circuits The circuit is short-circuited; when there is no electrical signal output from the resonant circuit, the resonant circuit is open. When the value difference of the electric signal between the two resonant circuits is greater than the signal threshold, then the two resonant circuits are not short-circuited. In this embodiment, the signal threshold is 300mv.

In a general embodiment, before step S130, it further includes: a step of passing the active point reading device through all the resonant circuits on the conductive film. Specifically, the point reading pen slowly moves along the diagonal on the conductive film panel to ensure that all resonant circuits on the conductive film can receive signals from the point reading pen.

Referring to FIG. 2 , a conductive thin film detection system provided by the present invention includes: an active point reading device 11 , a control module 12 and a judging module. The control module 12 and the judging module 13 are arranged in the point reader.

The active point-reading device 11 is used to touch and move on the conductive film, and the active point-reading device 11 emits an electromagnetic signal with a fixed frequency.

The control module 12 is used to open the resonant circuit on the conductive film that is in contact with the active point-reading device 11, and close the resonant circuit after receiving the electromagnetic signal and generating a corresponding electrical signal.

The judging module 13 is used for judging the state of the corresponding resonant circuit according to the value of the electric signal. When the difference in the value of the electric signal between the two resonant circuits is smaller than the signal threshold, the two resonant circuits are short-circuited. ; When there is no electrical signal output from the resonant circuit, the resonant circuit is open.

Preferably, after the active point reading device 11 traverses all the resonant circuits on the conductive film, the judging module 13 judges the state of the corresponding resonant circuits according to the value of the electrical signal.

Preferably, the resonance circuit is an LC circuit. Preferably, the active point reading device 11 is an active point reading pen.

Compared with the traditional conductive film detection method, the above-mentioned conductive film detection method and system have at least the following advantages: first, to test whether there is an open circuit or a short circuit in the conductive film, the traditional method must be tested before and after installation, this method only It needs to be tested once after installation, which improves the efficiency; secondly, the traditional test method requires the help of other instruments or equipment. This method only needs the equipment itself to perform the test, which is more convenient and quick, and saves production costs.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units is used as an example for illustration. The internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit in the embodiment can be integrated into one processing unit, or each unit can exist separately physically, or two or more units can be integrated into one unit, and the above-mentioned integrated units can be implemented in the form of hardware , can also be implemented in the form of software functional units. In addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present application. For the specific working process of the units in the above device, reference may be made to the corresponding process in the foregoing method embodiments, and details are not repeated here.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still carry out the foregoing embodiments The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A conductive thin film detection method, is characterized in that, comprises the following steps: The active point reading device is contacted and moved on the conductive film, and the active point reading device emits an electromagnetic signal of a fixed frequency; Open the resonant circuit on the conductive film that is in contact with the active point reading device, and close it after the resonant circuit receives the electromagnetic signal and generates a corresponding electrical signal; Judging the state of the corresponding resonant circuit according to the value of the electrical signal, when the difference in the value of the electrical signal between the two resonant circuits is less than the signal threshold, the two resonant circuits are short-circuited; If the resonant circuit has no electrical signal output, the resonant circuit is open. 2. The conductive film detection method according to claim 1, characterized in that, before the step of judging the state of the corresponding resonant circuit according to the value of the electrical signal, it also includes: The active point reading device traverses all resonant circuits on the conductive film. 3. The conductive film detection method according to claim 1 or 2, wherein the resonant circuit is an LC circuit. 4. The conductive film detection method according to claim 1 or 2, wherein the active point reading device is an active point reading pen. 5. A conductive film detection system, characterized in that, comprising: An active point-reading device is used for contacting and moving on the conductive film, and the active point-reading device emits an electromagnetic signal of a fixed frequency; A control module, configured to open the resonant circuit on the conductive film that is in contact with the active point-reading device, and close the resonant circuit after receiving the electromagnetic signal and generating a corresponding electrical signal; A judging module, configured to judge the state of the corresponding resonant circuit according to the value of the electrical signal, and when the difference in the value of the electrical signal between the two resonant circuits is less than the signal threshold, the two resonant circuits are short-circuited ; When there is no electrical signal output from the resonant circuit, the resonant circuit is open. 6. The conductive film detection system according to claim 5, characterized in that, after the active point reading device traverses all the resonant circuits on the conductive film, the judgment module is based on the value of the electric signal A state of the corresponding resonant circuit is judged. 7. The conductive thin film detection system according to claim 5 or 6, characterized in that the resonant circuit is an LC circuit. 8. The conductive film detection system according to claim 5 or 6, wherein the active point reading device is an active point reading pen.