Capacitive touch screen short circuit testing method, device, touch screen and equipment

Abstract

The embodiments of the present invention disclose a short-circuit test method, device, touch screen and equipment for capacitive touch screens, which can not only detect the touch electrodes that are short-circuited to each other in the capacitive touch screen, but also detect the corresponding short-circuit state. The short-circuit test method for the capacitive touch screen includes: determining a sending electrode for sending a voltage pulse; obtaining a short-circuit electrode that is short-circuited with the sending electrode; obtaining a first charging time constant corresponding to the short-circuit electrode in a short-circuit state; obtaining a second charging time constant corresponding to the short-circuit electrode in a non-short-circuit state; obtaining a comparison result of the first charging time constant and the second charging time constant; and determining the short-circuit state of the short-circuit electrode according to the comparison result.

Description

Technical Field

[0001] The present invention relates to the field of touch screen technology, and more specifically to a short circuit testing method, device, touch screen and equipment for capacitive touch screens. Background Art

[0002] Capacitive touch screens generally include multiple independent touch electrodes. There may be short circuits between the touch electrodes, which affects the use of the capacitive touch screen. Therefore, capacitive touch screens generally have a dedicated touch chip, which can be used to test whether there are short-circuited touch electrodes during mass production.

[0003] Taking the driving electrode as an example (the driving electrode is a type of touch electrode), short circuit detection can be performed by sending voltage pulses to each driving electrode in turn. Specifically, when a driving electrode that serves as a voltage pulse sending electrode sends a voltage pulse, the other driving electrodes are in a receiving state; if there is a short circuit, it means that there is an electrical connection between the voltage pulse sending electrode and the other driving electrodes, causing the pulse waveform of the aforementioned voltage pulse to leak to other driving electrodes and be captured by the touch chip. Therefore, as long as the touch chip detects that a pulse waveform corresponding to the pulse waveform sent by the voltage pulse sending electrode appears on other driving electrodes, it can be determined that the voltage pulse sending electrode and the driving electrode where the corresponding pulse waveform appears are short-circuited.

[0004] However, the above detection method can only identify two electrodes that are short-circuited to each other, but cannot determine the specific short-circuit state, such as whether it is a strong short circuit or a weak short circuit. It is generally believed that a weak short circuit will not affect the normal use of the capacitive touch screen, while a strong short circuit will. Therefore, the prior art cannot accurately determine whether the short circuit of the touch electrode will affect the normal use of the capacitive touch screen. Summary of the invention

[0005] An object of embodiments of the present invention is to solve the above-mentioned problems and provide advantages which will be described later.

[0006] Another object of the embodiments of the present invention is to provide a capacitive touch screen short circuit testing method, device, capacitive touch screen and equipment, which can not only detect touch electrodes that are short-circuited to each other in the capacitive touch screen, but also detect the corresponding short circuit state.

[0007] In a first aspect, an embodiment of the present application provides a method for testing a short circuit of a capacitive touch screen, comprising:

[0008] Determine a sending electrode for short circuit detection; wherein the sending electrode is an electrode selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, the touch electrode is a driving electrode or a sensing electrode, and the touch sensor is a capacitive sensor;

[0009] Acquire a short-circuit electrode short-circuited with the transmitting electrode;

[0010] Obtaining a first charging time constant corresponding to the short-circuit electrode under a short-circuit condition;

[0011] Obtaining a second charging time constant corresponding to the short-circuited electrode in a non-short-circuited state;

[0012] Obtaining a comparison result of the first charging time constant and the second charging time constant;

[0013] The short-circuit state of the short-circuit electrode is determined according to the comparison result.

[0014] In some technical solutions, determining a transmitting electrode for short circuit detection includes:

[0015] Acquiring an arrangement order of the plurality of touch electrodes;

[0016] Each touch electrode is sequentially determined as a sending electrode according to the arrangement order.

[0017] In some technical solutions, the step of obtaining a short-circuited electrode short-circuited with the transmitting electrode includes:

[0018] driving the transmitting electrode to emit a voltage pulse;

[0019] Detecting whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse, that is, whether a pulse waveform corresponding to the voltage pulse appears;

[0020] The electrode receiving the voltage pulse is determined to be the short-circuit electrode.

[0021] In some technical solutions, determining the short-circuit state of the short-circuit electrode according to the short-circuit impedance value includes:

[0022] When the short-circuit impedance value is greater than or equal to a predetermined threshold, it is determined that the short-circuit state of the short-circuit electrode is a weak short-circuit state;

[0023] When the short-circuit impedance value is less than a predetermined threshold, it is determined that the short-circuit state of the short-circuit electrode is a strong short-circuit state.

[0024] In a second aspect, an embodiment of the present application provides a capacitive touch screen short circuit testing device, comprising:

[0025] A determination module, used to determine a sending electrode for short circuit detection; wherein the sending electrode is selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, the touch electrode is a driving electrode or a sensing electrode, and the touch sensor is a capacitive sensor;

[0026] A short-circuit electrode acquisition module, used to acquire a short-circuit electrode that is short-circuited with the sending electrode;

[0027] A short-circuit charging time constant acquisition module, used to acquire a first charging time constant corresponding to the short-circuit electrode under a short-circuit condition;

[0028] A non-short-circuit charging time constant acquisition module, used to acquire a second charging time constant corresponding to the short-circuit electrode in a non-short-circuit condition;

[0029] A comparison module, used to obtain a comparison result between the first charging time constant and the second charging time constant;

[0030] A state determination module is used to determine the short-circuit state of the short-circuit electrode according to the comparison result.

[0031] In some technical solutions, the determining module includes:

[0032] An arrangement order unit, used to obtain an arrangement order of the plurality of touch electrodes;

[0033] The sending electrode determination unit is used to determine each touch electrode as a sending electrode in sequence according to the arrangement order.

[0034] In some technical solutions, the short-circuit electrode acquisition module includes:

[0035] A driving unit, used for driving the sending electrode to send out a voltage pulse;

[0036] A detection unit, configured to detect whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse;

[0037] The short-circuit electrode determination unit is used to determine that the electrode receiving the voltage pulse is the short-circuit electrode.

[0038] In a third aspect, an embodiment of the present application provides a capacitive touch screen, comprising:

[0039] Display screen;

[0040] a touch sensor comprising a plurality of touch electrodes; and

[0041] A touch chip comprises a processor and a memory, wherein the memory stores a computer instruction program that can be run on the processor, and when the computer instruction program is executed by the processor, the steps of the capacitive touch screen short circuit testing method described in the second aspect are implemented.

[0042] In a third aspect, an embodiment of the present application provides an electronic device, including the capacitive touch screen described in the third aspect.

[0043] The beneficial effects provided by the embodiments of the present invention include:

[0044] The capacitive touch screen short circuit test method provided in the embodiment of the present application can detect not only two touch electrodes short-circuited to each other in the capacitive touch screen, but also the corresponding short circuit state through the touch chip carried by the touch chip, so as to facilitate the judgment of whether the short circuit affects the normal use of the capacitive screen. The test method is simple and easy to implement, and can be implemented by writing computer program instructions corresponding to the steps of the test method into the touch chip.

[0045] The capacitive touch screen short circuit testing device, capacitive touch screen and electronic device provided in the embodiments of the present application can achieve the beneficial effects corresponding to the testing method.

[0046] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A flow chart of a method for testing a short circuit of a capacitive touch screen according to an embodiment of the present invention;

[0048] Figure 2 The figure is a schematic structural diagram of a capacitive touch screen according to an embodiment of the present invention.

[0049] Figure 3 Another flow chart of the method for testing a short circuit of a capacitive touch screen according to an embodiment of the present invention;

[0050] Figure 4 Another flow chart of the capacitive touch screen short circuit testing method according to the embodiment of the present invention;

[0051] Figure 5 A schematic diagram of a capacitive touch screen short circuit testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0053] The term "comprising" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0054] The terms "first", "second", "third", etc. in the embodiments of the present application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include at least one of the features. It should also be noted that in the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In addition to the above, it is still necessary to emphasize that the reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the first aspect, Figure 1 As shown, the embodiment of the present application provides a method for testing a short circuit of a capacitive touch screen, comprising the following steps S101-S106:

[0057] S101. Determine a sending electrode for sending a voltage pulse; wherein the sending electrode is an electrode selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, the touch sensor is a capacitive touch sensor, and the touch electrode is a driving electrode or a sensing electrode.

[0058] More specifically, it can be combined with Figure 2 To understand, Figure 2 , a capacitive touch screen 10 is shown, including a touch sensor 120 and a touch chip 110 , wherein the touch sensor includes a plurality of touch electrodes 121 .

[0059] Since a touch sensor generally has multiple touch electrodes, in order to facilitate the implementation of short circuit detection, during each detection, one electrode may be selected from the multiple touch electrodes as the sending electrode, and the other touch electrodes may be used as receiving electrodes for receiving voltage pulses.

[0060] It should also be noted that when the touch electrodes are driving electrodes, the short circuit test is performed on multiple driving electrodes of the touch sensor without involving the sensing electrodes; the same is true when the touch electrodes are sensing electrodes.

[0061] S102: Acquire a short-circuited electrode that is short-circuited with the transmitting electrode.

[0062] Specifically, the transmitting electrode sends out a voltage pulse for short-circuit detection, and the short-circuit situation can be determined based on the reception of the voltage pulse by other touch electrodes, that is, the touch electrode that receives the voltage pulse (i.e., the receiving electrode) can be identified as the short-circuited electrode short-circuited with the transmitting electrode. Figure 2 As shown, a corresponding pulse waveform P appears on the two touch electrodes that are short-circuited with each other.

[0063] S103: Obtain a first charging time constant corresponding to the short-circuit electrode in a short-circuit state.

[0064] The charging time constant is a well-known technical term, so the first charging time constant can be obtained according to the prior art.

[0065] Specifically, the charging time constant can be understood as the time required for a capacitor to be fully charged or for the voltage between the two plates at both ends of the capacitor to stabilize. Generally, the charging time constant is used as a characteristic value reflecting the charging and discharging speed of the RC series circuit. Because it is a short circuit, the impedance increases, so an RC integration circuit is formed. According to the RC integration circuit, there is the following expression for the charging time constant: T = RC; where T is the charging time constant, C is the capacitor, and R is the series resistance, that is, the short-circuit impedance.

[0066] It is understandable that in some embodiments, the transmitting electrode and the short-circuit electrode can constitute a capacitor, so the first charging time constant of the short-circuit electrode can be measured in the short-circuit condition in the following manner, that is, the transmitting electrode transmits a pulse waveform to the aforementioned capacitor at a predetermined time interval until the capacitor is fully charged. The value of the ADC circuit after the capacitor is fully charged no longer changes, and the number of pulse waveforms received by the capacitor voltage in the process of reaching a stable state is calculated. According to the number of received pulse waveforms and the time required to receive each pulse waveform, the first charging time constant can be calculated. Exemplarily, the time taken to receive each pulse waveform can be determined based on the time provided by the system clock inside the touch chip of the capacitive touch screen. It should also be noted that the number of received pulse waveforms is equal to the number of pulse waveforms sent by the transmitting electrode.

[0067] S104: Obtain a second charging time constant corresponding to the short-circuited electrode in a non-short-circuited state.

[0068] It should be noted that the non-short circuit condition in step S104 is relative to the short circuit condition in step S103. Similar to the first charging time constant, the second charging time constant can also be obtained through the prior art.

[0069] It is understandable that in some embodiments, the transmitting electrode and the short-circuit electrode can constitute a capacitor, so the second charging time constant of the short-circuit electrode can be measured in the non-short-circuit state in the following manner, that is, the transmitting electrode transmits a pulse waveform to the capacitor at a predetermined time interval until the capacitor is fully charged. After the capacitor is fully charged, the ADC circuit value no longer changes, and the number of pulse waveforms received by the capacitor voltage in the process of reaching a stable transition state is calculated. According to the number of received pulse waveforms and the time required to receive each pulse waveform, the second charging time constant can be calculated. Exemplarily, the time taken to receive each group of pulse waveforms can be determined based on the time provided by the system clock inside the touch chip of the capacitive touch screen. It should also be noted that the number of received pulse waveforms is equal to the number of pulse waveforms sent by the transmitting electrode.

[0070] S105: Obtain a comparison result between the first charging time constant and the second charging time constant.

[0071] The comparison result here is actually the change value of the charging time constant of the short-circuited electrode, which can be expressed as the difference or ratio between the first charging time constant and the second charging time constant. In some embodiments, the comparison result is the difference obtained by subtracting the first charging time constant from the second charging time constant.

[0072] S106. Determine the short-circuit state of the short-circuit electrode according to the comparison result.

[0073] There are two main short circuit states: weak short circuit state and strong short circuit state. The short circuit state can be determined as follows: when the short circuit impedance value is greater than or equal to a predetermined threshold, the short circuit state of the short circuit electrode is determined to be a weak short circuit; when the short circuit impedance value is less than a predetermined threshold, the short circuit state of the short circuit electrode is determined to be a strong short circuit. In some embodiments, the predetermined threshold is 500Kohm.

[0074] Generally speaking, when a short circuit occurs between two touch electrodes, the corresponding charging time constant will also change accordingly. Therefore, the short-circuit impedance value corresponding to the short-circuited electrode can be determined based on the change value of the charging time constant, that is, the short-circuit impedance value of the short-circuited electrode can be determined based on the comparison result.

[0075] It should be noted that there is no linear relationship between the short-circuit impedance value and the charging time constant of the short-circuit electrode. For example, if the charging time constant corresponding to the short-circuit electrode in the non-short-circuit condition is 100 seconds (s), and the short-circuit impedance value corresponding to the short-circuit electrode in the short-circuit condition is 100K ohm, the corresponding charging time constant is 1 second (s), then when the short-circuit impedance value increases 6 times to 600K ohm, the corresponding charging time constant may not only increase by 6 times, but become longer, as shown in Table 1 below:

[0076] Table 1

[0077]

[0078]

[0079] It should be noted that the multiple groups of data listed in the table are exemplary data and are not restrictive descriptions of the present application. Their purpose is to illustrate the relationship between the short-circuit impedance value, the charging time constant, and the circuit state.

[0080] It is easy to understand that for a short-circuited electrode, the smaller the difference between the first charging time constant and the second charging time constant, the more it tends to be a weak short circuit, and the larger the difference, the more it tends to be a strong short circuit. In other words, there is a corresponding relationship between the change value of the charging time constant and the short-circuit impedance value and the short-circuit state, as shown in Table 1 above; therefore, the short-circuit state can be determined based on the change value of the charging time constant.

[0081] In summary, according to the capacitive touch screen short circuit test method provided by the embodiment of the present application, the capacitive touch screen can not only detect the two touch electrodes that are short-circuited to each other in the capacitive touch screen through the touch chip carried by itself, but also detect the corresponding short circuit state, so as to facilitate the judgment of whether the short circuit affects the normal use of the capacitive screen. The test method is simple and easy to implement, and can be implemented by writing computer program instructions corresponding to the steps of the test method into the touch chip.

[0082] In addition, by detecting the specific short-circuit impedance, a clearer distinction can be made between good and bad capacitive touch screens. For example, a capacitive touch screen has a certain short-circuit impedance. Assuming that the short-circuit impedance is above 500KΩ or 600KΩ, the capacitive touch screen can be determined to be in a weak short-circuit state. This short-circuit state has little impact on the touch effect on the short-circuit channel because of the small amount of pulse signal leakage. In this case, the capacitive touch screen can be judged as a good product and shipped in a graded manner, rather than being directly classified as a bad product and scrapped.

[0083] Another point is that it can detect short-circuit impedance, which is also advantageous for improving the process of capacitive touch screens. For weak short circuits and micro short circuits, it can help engineers analyze whether it is a process problem or a difference in the raw materials themselves, and solve the problem in a more targeted manner.

[0084] In some embodiments, determining the sending electrode for sending the voltage pulse in step S101 includes:

[0085] Acquiring an arrangement order of the plurality of touch electrodes;

[0086] Each touch electrode is sequentially determined as the sending electrode according to the arrangement order.

[0087] In some embodiments, Figure 3 As shown, step S102, obtaining a short-circuited electrode short-circuited with the transmitting electrode, includes:

[0088] S1021, driving the sending electrode to emit a voltage pulse;

[0089] S1022, detecting whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse;

[0090] S1023. Determine that the electrode receiving the voltage pulse is the short-circuit electrode.

[0091] In some embodiments, Figure 4 As shown, step S104, obtaining a second charging time constant corresponding to the short-circuited electrode in a non-short-circuited state, includes:

[0092] S1041, measuring a third charging time constant corresponding to each touch electrode in a non-short circuit state, to obtain a plurality of third charging time constants;

[0093] S1042: Take a majority of the plurality of third charging time constants as the second charging time constant.

[0094] In some implementations, S106, determining the short-circuit state of the short-circuit electrode according to the comparison result, includes:

[0095] It is determined whether the first charging time constant is half of the second charging time constant. If so, it is determined that the short circuit state is a strong short circuit state.

[0096] When the two electrodes are in a strong short circuit (Ω level), it can be considered that the two electrodes are connected in parallel, and the impedance is reduced by half, from R to R / 2. According to the expression of the charging time constant, the charging time constant T=RC, so the charging time constant after a strong short circuit will also be reduced to RC / 2, that is, T / 2.

[0097] It should be noted that the “half” here refers to approximately half, that is, in some embodiments, the second charging time constant may be slightly greater than or less than twice the first charging time constant.

[0098] In some other implementations, S106, determining the short-circuit state of the short-circuit electrode according to the comparison result, includes the following steps S1061 to S1063:

[0099] S1061. Obtain a normal impedance value corresponding to the short-circuited electrode in a non-short-circuited state; illustratively, the capacitive touch screen includes double-sided ITO glass, and an approximate range of the normal impedance value can be calculated based on the square resistance of the double-sided ITO glass, the pitch width of ITO, etc., which can be achieved according to the prior art.

[0100] S1062. Determine the short-circuit impedance value corresponding to the short-circuit electrode in the short-circuit state according to the comparison result and the normal impedance value; illustratively, take the difference between the first charging time constant and the second charging time constant as the comparison result (which can be recorded as Deltaτ); divide Deltaτ into multiple parts, compare the time constant measurement values ​​of other touch electrodes that are not short-circuited with the averaged Deltaτ, and the specific short-circuit impedance can be determined after conversion. It should be noted that the purpose of dividing Deltaτ into multiple parts is to subdivide the short-circuit impedance into more areas, which is conducive to determining in which interval the specific channel short-circuit impedance value is located. Usually, if there is no short circuit between two electrodes, it can be determined that the impedance is infinite, but in the actual model, generally, the impedance between the two electrodes is at the MΩ level, which can be determined as no short circuit; and if the two electrodes are in a strong short circuit state, the impedance value is generally at the Ω level. Therefore, the short-circuit state from the Ω level to the MΩ level can be subdivided into multiple intervals, and then Deltaτ can be similarly subdivided to determine in which interval the impedance value of the short-circuited electrode between normal and strong short-circuited is distributed, thereby determining what impedance region the actual impedance of the corresponding short-circuited electrode is roughly in. In some embodiments, the short-circuit impedance value can be a range value that can be obtained by observing the short-circuited electrode with a microscope.

[0101] S1063. Determine the short-circuit state corresponding to the short-circuit electrode according to the short-circuit impedance value.

[0102] In some implementations, for a certain type of touch electrode, the corresponding relationship can be pre-determined and stored in the touch chip. In the short circuit test, as long as the change value of the charging time constant of the short circuit electrode in the short circuit state relative to the non-short circuit state is tested, the change value is compared with the corresponding relationship to obtain the corresponding short circuit impedance value.

[0103] In a second aspect, an embodiment of the present application provides a capacitive touch screen short circuit testing device, which is used to execute the capacitive touch screen short circuit testing method described in the embodiment of the first aspect.

[0104] The capacitive touch screen short circuit testing device 20 comprises:

[0105] The determination module 210 is used to determine a sending electrode for sending a voltage pulse; wherein the sending electrode is an electrode selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, and the touch sensor is a capacitive sensor;

[0106] A short-circuit electrode acquisition module 220, used to acquire a short-circuit electrode that is short-circuited with the transmitting electrode;

[0107] A short-circuit charging time constant acquisition module 230 is used to acquire a first charging time constant corresponding to the short-circuit electrode under a short-circuit condition;

[0108] A non-short-circuit charging time constant acquisition module 240 is used to acquire a second charging time constant corresponding to the short-circuit electrode in a non-short-circuit state;

[0109] A comparison module 250, configured to obtain a comparison result between the first charging time constant and the second charging time constant;

[0110] The state determination module 260 is used to determine the short-circuit state of the short-circuit electrode according to the comparison result.

[0111] In summary, the capacitive touch screen short circuit test device provided in the embodiment of the present application can detect not only two touch electrodes short-circuited to each other in the capacitive touch screen through the touch chip carried by the capacitive touch screen itself, but also the corresponding short circuit state, so as to facilitate the judgment of whether the short circuit affects the normal use of the capacitive screen. The test device is simple and easy to implement, and can be implemented by installing the software module corresponding to the test device in the touch chip.

[0112] In some technical solutions, the determining module includes:

[0113] An arrangement order unit, used to obtain an arrangement order of the plurality of touch electrodes;

[0114] The sending electrode determination unit is used to determine each touch electrode as a sending electrode in sequence according to the arrangement order.

[0115] In some technical solutions, the short-circuit electrode acquisition module includes:

[0116] A driving unit, used for driving the sending electrode to send out a voltage pulse;

[0117] A detection unit, configured to detect whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse;

[0118] The short-circuit electrode determination unit is used to determine that the electrode receiving the voltage pulse is the short-circuit electrode.

[0119] In the third aspect, combined Figure 2 As shown, the embodiment of the present application provides a capacitive touch screen 10, including:

[0120] Display screen (not shown);

[0121] A touch sensor 120, which includes a plurality of touch electrodes 121, wherein the touch electrodes 121 are driving electrodes or sensing electrodes; and

[0122] The touch chip 110 includes a processor and a memory, wherein the memory stores a computer instruction program that can be run on the processor, and when the computer instruction program is executed by the processor, the steps of the capacitive touch screen short circuit testing method described in the second aspect are implemented.

[0123] In a third aspect, an embodiment of the present application provides an electronic device, including the capacitive touch screen described in the embodiment of the third aspect. The electronic device may be a mobile phone, a tablet computer, a smart watch, and the like.

[0124] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Capacitive touch screen short circuit test method, It is characterized in that include: Determine a sending electrode for sending a voltage pulse; wherein the sending electrode is an electrode selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, the touch electrode is a driving electrode or a sensing electrode, and the touch sensor is a capacitive sensor; Acquire a short-circuit electrode short-circuited with the transmitting electrode; Obtaining a first charging time constant corresponding to the short-circuit electrode under a short-circuit condition; Obtaining a second charging time constant corresponding to the short-circuited electrode in a non-short-circuited state; Obtaining a comparison result of the first charging time constant and the second charging time constant; The short-circuit state of the short-circuit electrode is determined according to the comparison result.

2. The method for testing a short circuit of a capacitive touch screen according to claim 1, It is characterized in that The step of determining a transmitting electrode for short circuit detection comprises: Acquiring an arrangement order of the plurality of touch electrodes; Each touch electrode is sequentially determined as a sending electrode according to the arrangement order.

3. The method for testing a short circuit of a capacitive touch screen according to claim 1, It is characterized in that The step of obtaining a short-circuit electrode short-circuited with the sending electrode comprises: driving the transmitting electrode to emit a voltage pulse; Detecting whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse; The electrode receiving the voltage pulse is determined to be the short-circuit electrode.

4. The method for testing a short circuit of a capacitive touch screen according to claim 1, It is characterized in that The determining the short-circuit state of the short-circuit electrode according to the comparison result includes: Obtaining a normal impedance value corresponding to the short-circuited electrode in a non-short-circuited state; Determining a short-circuit impedance value corresponding to the short-circuit electrode in a short-circuit state according to the comparison result and the normal impedance value; The short-circuit state corresponding to the short-circuit electrode is determined according to the short-circuit impedance value.

5. The method for testing a short circuit of a capacitive touch screen according to claim 1, It is characterized in that The short circuit state is a strong short circuit state or a weak short circuit state.

6. Capacitive touch screen short circuit test device, It is characterized in that include: A determination module, used to determine a sending electrode for sending a voltage pulse; wherein the sending electrode is selected from a plurality of touch electrodes of a touch sensor of the capacitive touch screen, the touch electrode is a driving electrode or a sensing electrode, and the touch sensor is a capacitive sensor; A short-circuit electrode acquisition module, used to acquire a short-circuit electrode that is short-circuited with the sending electrode; A short-circuit charging time constant acquisition module, used to acquire a first charging time constant corresponding to the short-circuit electrode under a short-circuit condition; A non-short-circuit charging time constant acquisition module, used to acquire a second charging time constant of the touch sensor corresponding to the short-circuit electrode in a non-short-circuit state; A comparison module, used to obtain a comparison result between the first charging time constant and the second charging time constant; A state determination module is used to determine the short-circuit state of the short-circuit electrode according to the comparison result.

7. The capacitive touch screen short circuit testing device according to claim 6, It is characterized in that The determining module comprises: An arrangement order unit, used to obtain an arrangement order of the plurality of touch electrodes; The sending electrode determination unit is used to determine each touch electrode as a sending electrode in sequence according to the arrangement order.

8. The capacitive touch screen short circuit testing device according to claim 6, It is characterized in that The short-circuit electrode acquisition module comprises: A driving unit, used for driving the sending electrode to send out a voltage pulse; A detection unit, configured to detect whether any other electrode among the plurality of touch electrodes except the sending electrode receives the voltage pulse; The short-circuit electrode determination unit is used to determine that the electrode receiving the voltage pulse is the short-circuit electrode.

9. Capacitive touch screen, It is characterized in that include Display screen; A touch sensor comprising a plurality of touch electrodes; and A touch chip comprises a processor and a memory, wherein the memory stores a computer instruction program that can be run on the processor, and when the computer instruction program is executed by the processor, the steps of the capacitive touch screen short circuit test method described in any one of claims 1 to 5 are implemented.

10. An electronic device comprising the capacitive touch screen according to claim 9.

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