Signal processing method, touch chip, and touch apparatus

Abstract

A signal processing method, a touch chip, and a touch apparatus. The signal processing method comprises: detecting a touch operation on a touch electrode in a touch area, and acquiring a first-type capacitance signal amount and a second-type capacitance signal amount, the first-type capacitance signal amount comprising a first effective touch signal amount and a first amount of change in capacitance, and the second-type capacitance signal amount comprising a second effective touch signal amount and a second amount of change in capacitance; on the basis of the first effective touch signal amount and the second effective touch signal amount, determining an effective touch signal of the touch electrode in the touch area; and / or, on the basis of the first amount of change in capacitance and the second amount of change in capacitance, determining a temperature signal of the touch electrode in the touch area. By using the above solution, an effective touch signal that is not affected by a temperature signal can be acquired.

Description

Signal processing method, touch chip and touch device

[0001] The present application claims priority to the Chinese patent application No. 202411032436.9, filed on July 29, 2024, and entitled "Signal processing method, touch chip and touch device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of sensors, and in particular to a signal processing method, a touch chip and a touch device. BACKGROUND

[0003] Touch devices (such as touch screens, etc.) are widely used in various electronic devices as human-computer interaction devices.

[0004] In actual applications, a user can contact a touch device by a finger or the like, or click and press the touch device by a touch pen, to realize touch operation on the touch device. The touch device generates an actual touch signal based on the touch operation. In the actual touch signal, there are an effective touch signal generated due to the touch operation, and a temperature signal corresponding to a surface temperature of the touch device, which changes with a time length of the touch operation and also changes with an ambient temperature.

[0005] In the prior art, the actual touch signal is temperature-compensated to eliminate the influence of the temperature signal on the effective touch signal. Generally, the actual touch signal is temperature-compensated with reference to an ambient temperature or a temperature of a touch chip in the touch device. However, the ambient temperature and the temperature of the touch chip cannot represent the temperatures of different regions of the touch device, so the temperature compensation precision is low. SUMMARY

[0006] The signal processing method, the touch chip and the touch device provided by the present application can eliminate the temperature signal from the actual touch signal, improve the temperature compensation precision, and obtain an enhanced effective touch signal.

[0007] In a first aspect, the present application provides a signal processing method, comprising: detecting a touch operation on the touch device, and obtaining a first type of capacitance signal amount and a second type of capacitance signal amount of a touch electrode in a touch area; the first type of capacitance signal amount comprises a first effective touch signal amount and a first capacitance variation amount, and the second type of capacitance signal amount comprises a second effective touch signal amount and a second capacitance variation amount; the first effective touch signal amount and the second effective touch signal amount are associated with the touch operation; the first capacitance variation amount and the second capacitance variation amount are associated with a real-time temperature of the touch electrode in the touch area; and based on the first effective touch signal amount and the second effective touch signal amount, determining an effective touch signal of the touch electrode in the touch area, which is irrelevant to the real-time temperature of the touch electrode in the touch area.

[0008] When the touch operation is detected, the first effective touch signal amount, the first capacitance variation amount, the second effective touch signal amount and the second capacitance variation amount of the touch electrode in the touch area can be obtained. The first effective touch signal amount and the second effective touch signal amount are associated with the touch operation, and the first capacitance variation amount and the second capacitance variation amount are associated with the real-time temperature of the touch electrode in the touch area. Based on the first effective touch signal amount and the second effective touch signal amount, the effective touch signal of the touch electrode in the touch area can be determined. That is, by eliminating the first capacitance variation amount and the second capacitance variation amount which vary with temperature, the effective touch signal irrelevant to the real-time temperature of the touch electrode in the touch area can be obtained, and the effective touch signal can be enhanced.

[0009] Optionally, the first type of capacitance signal amount is S: S=D s +△C s , and the second type of capacitance signal amount is M: M=D m +△C m , wherein: D s is the first effective touch signal amount, D m is the second effective touch signal amount;△C s is the first capacitance variation amount, and△C s =X×T s ;△C m is the second capacitance variation amount, and△C m =X×T m , X is the real-time temperature of the touch electrode in the touch area; T s is a first temperature variation rate, T m is a second temperature variation rate; T s is the same as the sign of D s , T m is opposite to the sign of D m , or Ts T s is opposite to the sign of D m . m T s is same as the sign of D m .

[0010] Optionally, the determining the effective touch signal of the touch electrode in the touch area based on the first effective touch signal amount and the second effective touch signal amount comprises: obtaining a first coefficient p and a second coefficient q, p and q satisfy: p×T s =q×T m ; and the effective touch signal of the touch electrode in the touch area is Signal: Signal=p×D s -q×D m .

[0011] Optionally, after obtaining the first type of capacitance signal amount and the second type of capacitance signal amount of the touch electrode in the touch area, the signal processing method further comprises: obtaining a third coefficient a and a fourth coefficient b, a and b satisfy a×D s +b×D m =0; determining a temperature signal Temp of the touch electrode in the touch area as Temp=a×△C s +b×△C s , and the temperature signal Temp is related to a real-time temperature of the touch electrode in the touch area.

[0012] Optionally, D m satisfies D m =M1-M0; wherein S0 is the first type of capacitance signal amount when the touch electrode does not have touch operation, M0 is the second type of capacitance signal amount when the touch electrode does not have touch operation, S1 is the first type of capacitance signal amount of the touch electrode at the initial moment of touch operation, and M1 is the second type of capacitance signal amount of the touch electrode at the initial moment of touch operation.

[0013] Optionally, T s satisfies T s =(S2-S1) / (X2-X1), and T m satisfies T m =(M2-M1) / (X2-X1); wherein S1 is the first type of capacitance signal amount when the real-time temperature of the touch electrode in the touch area is X1, S2 is the first type of capacitance signal amount when the real-time temperature of the touch electrode in the touch area is X2; M1 is the second type of capacitance signal amount when the real-time temperature of the touch electrode in the touch area is X1, and M2 is the second type of capacitance signal amount when the real-time temperature of the touch electrode in the touch area is X2.

[0014] Optionally, the first type of capacitance is self-capacitance of the touch electrodes in the touch area, and the second type of capacitance is mutual-capacitance of the touch electrodes in the touch area; or, the first type of capacitance is mutual-capacitance of the touch electrodes in the touch area, and the second type of capacitance is self-capacitance of the touch electrodes in the touch area.

[0015] In a second aspect, the present application provides a touch chip, comprising: an acquisition module configured to detect a touch operation on a touch device, and acquire a first type of capacitance signal amount and a second type of capacitance signal amount of touch electrodes in a touch area; the first type of capacitance signal amount comprises a first effective touch signal amount and a first capacitance variation amount, and the second type of capacitance signal amount comprises a second effective touch signal amount and a second capacitance variation amount; the first effective touch signal amount and the second effective touch signal amount are associated with the touch operation, and the first capacitance variation amount and the second capacitance variation amount are associated with a real-time temperature of the touch electrodes in the touch area; and a processing module configured to determine an effective touch signal of the touch electrodes in the touch area based on the first effective touch signal amount and the second effective touch signal amount, wherein the effective touch signal of the touch electrodes in the touch area is irrelevant to the real-time temperature of the touch electrodes in the touch area.

[0016] Optionally, the touch chip further comprises a storage module configured to store a temperature coefficient of the touch electrodes; the temperature coefficient of the touch electrodes is K associated with T s and T m , K=T s / T m , or K=T m / T s ; wherein T s satisfies T s =(S2-S1) / (X2-X1), and T m satisfies T m =(M2-M1) / (X2-X1); wherein S1 is the first type of capacitance signal amount when the real-time temperature of the touch electrodes in the touch area is X1, and S2 is the first type of capacitance signal amount when the real-time temperature of the touch electrodes in the touch area is X2; M1 is the second type of capacitance signal amount when the real-time temperature of the touch electrodes in the touch area is X1, and M2 is the second type of capacitance signal amount when the real-time temperature of the touch electrodes in the touch area is X2.

[0017] Optionally, the touch electrodes of the touch device comprise a plurality of driving electrodes and receiving electrodes arranged in a cross-insulation manner or a layered manner, and at least part of the touch electrodes have a corresponding temperature coefficient K and are stored in the storage module; the effective touch signal of the driving electrodes and the effective touch signal of the receiving electrodes are used to determine position information of the touch area on the touch device.

[0018] Optionally, the touch electrodes of the touch device are arranged in a dot matrix or a strip, and at least some of the touch electrodes have a corresponding temperature coefficient K and are stored in the storage module.

[0019] In a third aspect, the present application provides a touch device comprising a touch electrode and a touch chip connected to each other, wherein the touch chip performs the steps of any one of the signal processing methods described above. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a flow chart of a signal processing method according to an embodiment of the present application;

[0021] Fig. 2 is a waveform diagram of a first type of capacitance signal quantity and a second type of capacitance signal quantity;

[0022] Fig. 3 is an equivalent circuit diagram when a touch electrode is not touched;

[0023] Fig. 4 is an equivalent circuit diagram when a touch electrode is touched;

[0024] Fig. 5 is a waveform diagram of an effective touch signal according to an embodiment of the present application;

[0025] Fig. 6 is a distribution diagram of touch electrodes of a self-capacitance or mutual-capacitance capacitive screen according to an embodiment of the present application;

[0026] Fig. 7 is a diagram of touch electrodes of a self-capacitance capacitive screen according to an embodiment of the present application;

[0027] Fig. 8 is a waveform diagram of a temperature signal according to an embodiment of the present application;

[0028] Fig. 9 is a module diagram of a touch chip according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] As described in the background section, when a user performs a touch operation on a touch device, the touch signal generated by the touch device includes an effective touch signal generated by the touch operation and a temperature signal corresponding to the surface temperature of the touch electrode. In some scenarios, the temperature signal can be regarded as an interference signal of the effective touch signal, and thus it is necessary to eliminate the temperature signal in the actual touch signal as much as possible. However, how to accurately eliminate the temperature signal from the touch signal to obtain an accurate effective touch signal is not involved in the prior art.

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] An embodiment of the present application provides a signal processing method, which will be described in detail below by specific steps with reference to Fig. 1.

[0032] In the embodiments of the present application, the signal processing method described below can be executed by a module with data processing capability in the touch device. Specifically, the module with data processing capability in the touch device can be a touch chip. In the following embodiments, the signal processing method is executed by a touch chip as an example.

[0033] In step 101, a touch operation on the touch device is detected, and a first type of capacitive signal amount and a second type of capacitive signal amount of the touch electrodes in the touch area are obtained.

[0034] In the embodiments of the present application, the touch operation can include a contact touch operation and a non-contact sensing operation. The non-contact sensing operation can be a touch operation with a separation article such as a glove. The non-contact sensing operation can also include a proximity sensing such as capacitive sensing caused by opening and closing the cover of a notebook computer.

[0035] In specific implementations, a user can perform a touch operation on the touch device. For example, the user can perform a touch operation on the touch device by clicking, swiping, and the like with a finger. Alternatively, the user can perform a touch operation on the touch device by using a stylus.

[0036] In specific implementations, the touch device can be a capacitive screen, including a self-capacitive capacitive screen, a mutual-capacitive capacitive screen, a self-mutual integrated capacitive screen, a touch-and-display integrated capacitive screen, and the like.

[0037] In specific implementations, the touch device includes a plurality of touch electrodes. The touch electrodes can include driving electrodes and receiving electrodes.

[0038] In some embodiments, the touch device can be a self-capacitive capacitive screen including a plurality of touch electrodes arranged in a vertical direction. In some application scenarios, the touch device can be a mutual-capacitive capacitive screen, in which even-numbered columns of touch electrodes are used as driving electrodes to send signals, and odd-numbered columns of touch electrodes are used as receiving electrodes to receive signals. In other application scenarios, odd-numbered columns of touch electrodes are used as driving electrodes to send signals, and even-numbered columns of touch electrodes are used as receiving electrodes to receive signals.

[0039] In other embodiments, the touch device can be a self-mutual integrated capacitive screen including a plurality of driving electrodes arranged in a horizontal direction and a plurality of receiving electrodes arranged in a vertical direction, and the driving electrodes and the receiving electrodes are insulatively crossed.

[0040] When a user performs a touch operation on the touch device, a touch area corresponding to the touch operation is formed on the touch device. The touch area described above is the area where the user touches the touch device. The touch area can include one or more touch electrodes.

[0041] In the touch operation, the touch electrodes in the touch area can generate the first type of capacitive signal amount and the second type of capacitive signal amount.

[0042] In specific implementations, the first type of capacitive touch signal amount and the second type of capacitive touch signal amount can be collected in time division. The first type of capacitive touch signal amount can be collected first, and then the second type of capacitive touch signal amount can be collected; or the second type of capacitive touch signal amount can be collected first, and then the first type of capacitive touch signal amount can be collected.

[0043] In the embodiments of the present application, the first type of capacitive signal amount can include a first effective touch signal amount and a first capacitive change amount. The second type of capacitive signal amount can include a second effective touch signal amount and a second capacitive change amount. The first effective touch signal amount and the second effective touch signal amount are associated with the touch operation, and the first capacitive change amount and the second capacitive change amount are associated with the real-time temperature of the touch electrodes in the touch area.

[0044] As the running time of the touch device increases, and the contact time of the user and the touch electrodes in the touch area increases, the real-time temperature of the touch electrodes in the touch area changes, and the dielectric constant of the material of the touch electrodes in the touch area changes with the change of the real-time temperature, and then the first type of capacitive signal amount and the second type of capacitive signal amount also change with the real-time temperature.

[0045] In the embodiments of the present application, the first effective touch signal amount does not change with the change of the real-time temperature, or the change amount of the first effective touch signal amount with the change of the real-time temperature can be ignored. The first capacitive change amount changes with the change of the real-time temperature. The second effective touch signal amount does not change with the change of the real-time temperature, or the change amount of the second effective touch signal amount with the change of the real-time temperature can be ignored. The second capacitive change amount changes with the change of the real-time temperature.

[0046] In specific implementations, the first type of capacitive signal amount and the second type of capacitive signal amount can be output by a module with data processing capability based on the original capacitive real-time value. The operation process can be to subtract the reference capacitive value from the original capacitive real-time value. The first effective touch signal amount is the amount of change of the first type of capacitive signal amount before and after touch under constant temperature conditions. The second effective touch signal amount is the amount of change of the second type of capacitive signal amount before and after touch under constant temperature conditions.

[0047] In specific implementations, the first capacitive change amount is affected by the real-time temperature and the first temperature change rate, and the second capacitive change amount is affected by the real-time temperature and the second temperature change rate.

[0048] Specifically, if the first temperature change rate is positive, the first capacitance change amount increases with the increase of the real-time temperature and decreases with the decrease of the real-time temperature. If the first temperature change rate is negative, the first capacitance change amount decreases with the increase of the real-time temperature and increases with the decrease of the real-time temperature.

[0049] Correspondingly, if the second temperature change rate is positive, the second capacitance change amount increases with the increase of the real-time temperature and decreases with the decrease of the real-time temperature. If the second temperature change rate is negative, the second capacitance change amount decreases with the increase of the real-time temperature and increases with the decrease of the real-time temperature.

[0050] In the embodiment of the present application, when the first temperature change rate is the same as the sign of the first effective touch signal amount, the second temperature change rate is opposite to the sign of the second effective touch signal amount. Or, when the first temperature change rate is opposite to the sign of the first effective touch signal amount, the second temperature change rate is the same as the sign of the second effective touch signal amount.

[0051] In the specific implementation, several cases described in Table 1 below are included:

[0052] Table 1

[0053] In Table 1, D s is the first effective touch signal amount, T s is the first temperature change rate; D m is the second effective touch signal amount, T m is the first temperature change rate.

[0054] For the sake of brevity, only some cases are explained in detail:

[0055] As in case 3 in Table 1 above, when the first effective touch signal amount is negative and the second effective touch signal amount is negative, the first temperature change rate is positive, and the first capacitance change amount has the same change trend as the real-time temperature; the second temperature change rate is negative, and the second capacitance change amount has the opposite change trend as the real-time temperature.

[0056] In case 5 in Table 1 above, when the first effective touch signal amount is positive and the second effective touch signal amount is negative, the first temperature change rate is positive, and the first capacitance change amount has the same change trend as the real-time temperature; the second temperature change rate is positive, and the second capacitance change amount has the same change trend as the real-time temperature.

[0057] In case 6 in the above table 1, when the first effective touch signal amount is negative and the second effective touch signal amount is positive, the first temperature change rate is positive, and the first capacitance change amount has the same change trend as the real-time temperature; the second temperature change rate is positive, and the second capacitance change amount has the same change trend as the real-time temperature.

[0058] In case 7 in the above table 1, when the first effective touch signal amount is positive and the second effective touch signal amount is negative, the first temperature change rate is negative, and the first capacitance change amount has the opposite change trend as the real-time temperature; the second temperature change rate is negative, and the second capacitance change amount has the opposite change trend as the real-time temperature.

[0059] In some embodiments, the first effective touch signal amount is a self-capacitance effective touch signal amount of the touch electrodes in the touch area, and the first capacitance change amount is a change amount of the self-capacitance of the touch electrodes in the touch area with the real-time temperature. The second effective touch signal amount is a mutual-capacitance effective touch signal amount of the touch electrodes in the touch area, and the second capacitance change amount is a change amount of the mutual-capacitance of the touch electrodes in the touch area with the real-time temperature.

[0060] In some other embodiments, the first effective touch signal amount is a mutual-capacitance effective touch signal amount of the touch electrodes in the touch area, and the first capacitance change amount is a change amount of the mutual-capacitance of the touch electrodes in the touch area with the real-time temperature. The second effective touch signal amount is a self-capacitance effective touch signal amount of the touch electrodes in the touch area, and the second capacitance change amount is a change amount of the self-capacitance of the touch electrodes in the touch area with the real-time temperature.

[0061] In the embodiments of the present application, in the process of the touch operation on the touch device, at the initial moment of the touch operation, a first type of capacitance signal amount corresponding to the touch electrodes in the touch area can be obtained, denoted as S1; a second type of capacitance signal amount corresponding to the touch electrodes in the touch area can be obtained, denoted as M1. At the initial moment of the touch operation, the real-time temperature of the touch electrodes in the touch area is X1. S1 and M1 can be output by the touch chip.

[0062] Since at the initial moment of the touch operation, the touch object (such as a user's finger) just contacts the touch electrodes in the touch area, the influence of the surface temperature of the touch object on the real-time temperature of the touch electrodes in the touch area can be ignored. Thus, the first effective touch signal amount is D s =S1-S0, and the second effective touch signal amount is D m =M1-M0. S0 and M0 are respectively the first type of capacitance signal amount and the second type of capacitance signal amount existing on the touch electrodes without the touch operation on the touch device.

[0063] In the embodiments of the present application, the first type of capacitance signal amount is S: S=D s +△C s, the second type of capacitance signal quantity is M: M=D m +△C m , wherein:△C s is the first capacitance change amount, and△C s = X x T s ;△C m is the second capacitance change amount, and△C m = X x T m , X is the real-time temperature of the touch electrode in the touch area; T s is the first temperature change rate, and T m is the second temperature change rate.

[0064] In an embodiment, D s may be positive, T s may be positive, D m may be negative, and T m may be positive. X x T s is the first capacitance change amount, when the real-time temperature X gradually increases, X x T s also gradually increases, and the corresponding first type of capacitance signal quantity S gradually increases; when the real-time temperature X gradually decreases, X x T s also gradually decreases, and the corresponding first type of capacitance signal quantity S gradually decreases. X x T m is the second capacitance change amount. When the real-time temperature X gradually increases, X x T m gradually increases, and the second type of capacitance signal quantity M gradually increases; when the real-time temperature X gradually decreases, X x T m gradually decreases, and the second type of capacitance signal quantity M gradually decreases.

[0065] In another embodiment, D s may be negative, T s may be negative, D m may be positive, and T m may be negative. X x T s is the first capacitance change amount, when the real-time temperature X gradually increases, X x T s also gradually decreases, and the corresponding first type of capacitance signal quantity S gradually decreases; when the real-time temperature X gradually decreases, X x T s gradually increases, and the corresponding first type of capacitance signal quantity S gradually increases. X x T m is the second capacitance change amount. When the real-time temperature X gradually increases, X x T m gradually decreases, and the second type of capacitance signal quantity M gradually decreases; when the real-time temperature X gradually decreases, X x T m gradually increases, and the second type of capacitance signal quantity M gradually increases.

[0066] Referring to FIG. 2, a waveform diagram of the first type of capacitive signal quantity and the second type of capacitive signal quantity in an embodiment of the present application is given.

[0067] In FIG. 2, before time t1, there is no touch operation on the touch device, and the first type of capacitive signal quantity existing on the touch electrode is S0, and the second type of capacitive signal quantity existing on the touch electrode is M0.

[0068] The touch object touches the touch device, and the touch electrode in the touch region generates the first type of capacitive signal quantity S and the second type of capacitive signal quantity M. In the embodiment of the present application, the first effective touch quantity D s is positive, and the second effective touch signal quantity D m is negative. At time t1, the real-time temperature of the touch electrode is X1, and the touch electrode in the touch region generates the first type of capacitive signal quantity S1 and the second type of capacitive signal quantity M1.

[0069] From time t1 to time t2, as the touch time increases, the real-time temperature of the touch electrode in the touch region increases, and the first type of capacitive signal quantity S gradually increases and gradually stabilizes. Correspondingly, the second type of capacitive signal quantity M also gradually increases, because although D m is negative, the value of X×T m is slowly increasing as the real-time temperature X increases.

[0070] At time t2, the touch reaches a certain length of time, and the temperature conduction of the touch object and the self-running heat of the touch electrode cause the temperature of the touch region at time t2 to change relative to time t1. At time t2, the real-time temperature of the touch electrode in the touch region is X2, and the touch electrode in the touch region generates the first type of capacitive signal quantity S2 and the second type of capacitive signal quantity M2.

[0071] Continuing to combine FIG. 2, in some embodiments, for the touch electrode in the touch region, the first type of capacitive signal quantity S1 and the second type of capacitive signal quantity M1 of the first real-time temperature X1, the first type of capacitive signal quantity S2 and the second type of capacitive signal quantity M2 of the second real-time temperature X2 can be obtained.

[0072] Based on S1, S2, and X1, X2, the value of the first temperature change rate T s can be determined. Based on M1, M2, and X1, X2, the value of the second temperature change rate T m can be determined.

[0073] In some embodiments, T s =(S2-S1) / (X2-X1), and T m =(M2-M1) / (X2-X1).

[0074] It can be understood that the above Ts , T m The acquisition process can also adopt other manners.

[0075] For example, the first type of capacitive signal quantity and the second type of capacitive signal quantity corresponding to any two time points (such as t3 and t4) within t1-t2 can be acquired, and then T s , T m .

[0076] Specifically, t3 is set, the real-time temperature X3 of the touch electrode in the touch area corresponds to the first type of capacitive signal quantity S3 and the second type of capacitive signal quantity M3; the real-time temperature X4 corresponds to the first type of capacitive signal quantity S4 and the second type of capacitive signal quantity M4. T s =(S4-S3) / (X4-X3), T m =(M4-M3) / (X4-X3).

[0077] Alternatively, the first type of capacitive signal quantity and the second type of capacitive signal quantity corresponding to multiple different temperatures can be acquired, and T s , T m is obtained by least square fitting.

[0078] In some other embodiments, T s and T m can also be obtained through a limited number of experiments in advance and stored in the touch chip in advance. When the touch chip detects a touch operation on the touch electrode, the temperature coefficient K of the touch electrode corresponding to the touch area can be acquired from the preset storage area, K=T s / T m , or K=T m / T s .

[0079] The following is a principle description of the self-capacitance effective touch signal quantity, the mutual-capacitance effective touch signal quantity, the change amount of the self-capacitance with the real-time temperature, and the change amount of the mutual-capacitance with the real-time temperature.

[0080] Referring to FIG. 3, an equivalent circuit diagram when the touch electrode is not touched is given. Referring to FIG. 4, an equivalent circuit diagram when the touch electrode is touched is given. In FIG. 3 and FIG. 4, the touch electrode includes the shown driving electrode Tx and the receiving electrode Rx.

[0081] In FIG. 3, C t is the ground capacitance of the driving electrode Tx, C r is the ground capacitance of the receiving electrode Rx. C m is the coupling capacitance between the receiving electrode Rx and the driving electrode Tx, that is, the mutual-capacitance between the touch electrodes, C m=C'S / d, where ε is the dielectric constant of the touch electrode material, S is the relative area of the driving electrode Tx and the receiving electrode Rx, and d is the relative distance between the driving electrode Tx and the receiving electrode Rx.

[0082] In FIG. 4, when the touch electrode is touched, the ground capacitance of the driving electrode Tx is C t +C ft , and the ground capacitance of the receiving electrode Rx is C r +C fr When the touch object touches the touch electrode, the coupling capacitance between the receiving electrode Rx and the driving electrode Tx changes from C m to C' m Without considering the real-time temperature change, then D m =C' m -C m As known from the prior art, C' m <C m , so D m <0.

[0083] In the embodiment of the present application, C t is taken as the self-capacitance when the touch electrode is not touched, and C t +C ft is taken as the self-capacitance when the touch electrode is touched. Without considering the real-time temperature change, then D s =(C t +C ft )-C t , D s >0.

[0084] For any touch electrode in the touch device, the first type of capacitance signal amount and the second type of capacitance signal amount can be detected.

[0085] In step 102, the effective touch signal of the touch region is determined based on the first effective touch signal amount and the second effective touch signal amount.

[0086] In the embodiment of the present application, the effective touch signal of the touch electrode in the touch region is irrelevant to the temperature signal of the touch electrode in the touch region. In other words, the effective touch signal of the touch electrode in the touch region is almost not affected by the temperature signal of the touch electrode in the touch region.

[0087] In the specific implementation, if the effective touch signal irrelevant to the temperature signal is to be obtained, the first capacitance change amount and the second capacitance change amount caused by the real-time temperature change need to be eliminated.

[0088] Specifically, the first coefficient p and the second coefficient q can be obtained, which satisfy pT s =qT m, the first coefficient p and the second coefficient q can be positive numbers. Based on the first coefficient p, the second coefficient q, the first type of capacitive signal amount S and the second type of capacitive signal amount M, the effective touch signal signal of the touch electrode in the touch area is obtained as: signal = p x S - q x M = p x D s -q x D m .

[0089] It can be seen that the effective touch signal of the touch electrode in the touch area obtained is related to the first effective touch signal amount and the second effective touch signal amount, and is irrelevant to the temperature signal of the touch electrode in the touch area.

[0090] Referring to FIG. 5, a waveform diagram of an effective touch signal in an embodiment of the present application is given. In FIG. 5, at t1, a touch object touches the touch device, and the touch electrode in the touch area generates an effective touch signal. At t2, the touch object leaves the touch device, and the effective touch signal disappears.

[0091] It can be seen from FIG. 2 and FIG. 5 that the effective touch signal obtained in FIG. 5 is the superposition of the first effective touch signal amount and the second effective touch signal amount. It can be seen that the signal processing method provided in the embodiment of the present application can not only eliminate the influence of the temperature signal, but also enhance the effective touch signal, and greatly improve the signal-to-noise ratio. Based on the enhanced effective touch signal, the position of the touch area can be more accurately judged, or the proximity of other objects can be judged.

[0092] In the embodiment of the present application, after the touch operation occurs, the first type of capacitive signal amount S and the second type of capacitive signal amount M of all or part of the touch electrodes of the touch device are obtained, and D s and D m are calculated based on the pre-obtained S0 and M0, and the effective touch signal Signal is further calculated based on the temperature coefficient K corresponding to the touch electrode in the touch area.

[0093] It can be seen from the above embodiment that when the touch operation occurs, the first type of capacitive signal amount and the second type of capacitive signal amount show opposite change trends, that is, when the touch operation occurs, the first type of capacitive signal amount is positive, and the second type of capacitive signal amount is negative; or when the touch operation occurs, the first type of capacitive signal amount is negative, and the second type of capacitive signal amount is positive.

[0094] For example, the first type of capacitive signal is self-capacitance, and the second type of capacitive signal is mutual-capacitance. When the touch operation occurs, the self-capacitance signal amount increases and is positive, and the negative capacitance signal amount decreases and is negative.

[0095] Since the first effective touch signal amount and the second effective touch signal amount are constant values in the stable touch state, and the first temperature change rate and the second temperature change rate are constant values, the change of the first capacitance signal amount and the second capacitance signal amount is associated with the change of the real-time temperature of the touch electrode.

[0096] Specifically, when the real-time temperature of the touch electrode changes, the first type of capacitance signal amount and the second type of capacitance signal amount both increase or both decrease accordingly. Therefore, when pT s = qT m , signal = p x S - q x M = p x D s - q x D m , the influence of temperature on touch operation can be eliminated.

[0097] In a specific implementation, when the touch electrodes of the touch device include a plurality of driving electrodes and receiving electrodes arranged in a cross-insulation manner or a layered manner, at least part of the touch electrodes each have a corresponding temperature coefficient K, and the temperature coefficients K corresponding to at least part of the touch electrodes are stored in a storage module of a touch chip.

[0098] After obtaining the effective touch signal corresponding to each touch electrode, it can be known which driving electrodes have effective touch signal amounts exceeding a set threshold value and which receiving electrodes have effective touch signal amounts exceeding the set threshold value. Based on the driving electrodes and the receiving electrodes having effective touch signal amounts exceeding the set threshold value, the specific position of the touch region in the touch device can be determined.

[0099] For example, referring to FIG. 6, a distribution diagram of touch electrodes of a self-mutual integrated capacitive screen in an embodiment of the present application is given.

[0100] In FIG. 6, the self-mutual integrated capacitive screen includes y r receiving electrodes and y t driving electrodes. It is assumed that the effective touch signal of the driving electrode Tx7 exceeds a set threshold value, and the effective touch signal of the receiving electrode Rx9 exceeds the set threshold value. Therefore, the touch region is the intersection node of the driving electrode Tx7 and the receiving electrode Rx9.

[0101] In a specific implementation, when the touch electrodes of the touch device are arranged in a dot matrix or a strip shape, at least part of the touch electrodes each have a corresponding temperature coefficient K, and the temperature coefficients K corresponding to at least part of the touch electrodes are stored in a storage module of a touch chip.

[0102] After obtaining the effective touch signal corresponding to each touch electrode, it can be known which driving electrodes have effective touch signal amounts exceeding a set threshold value and which receiving electrodes have effective touch signal amounts exceeding the set threshold value. Based on the driving electrodes and the receiving electrodes having effective touch signal amounts exceeding the set threshold value, the specific position of the touch region in the touch device can be determined.

[0103] Referring to FIG. 7, a schematic diagram of a dot-matrix distributed touch electrode is shown. In FIG. 7, if the effective touch signal amount of the touch electrode in the second row and the second column exceeds a set threshold, it is determined that the touch electrode in the second row and the second column is touched.

[0104] In the embodiment of the present application, the temperature signal of the touch electrode in the touch area can also be determined based on the first capacitance variation and the second capacitance variation. The temperature signal of the touch electrode in the touch area is irrelevant to the effective touch signal. In other words, the temperature signal of the touch electrode in the touch area is hardly affected by the effective touch signal.

[0105] In a specific implementation, if the temperature signal irrelevant to the touch operation is needed to be obtained, the first effective touch signal amount and the second effective touch signal amount caused by the touch operation can be eliminated.

[0106] Specifically, the third coefficient a and the fourth coefficient b can be obtained, and aD s +bD m =0, and the third coefficient a and the fourth coefficient b can both be positive numbers. Based on the third coefficient a, the first type of capacitance signal amount S, the fourth coefficient b and the second type of capacitance signal amount M, the temperature signal Temp of the touch electrode in the touch area is obtained as follows: Temp=a×S+b×M=a×T s ×X+b×T m ×X.

[0107] It can be seen that the obtained temperature signal Temp of the touch electrode in the touch area is irrelevant to the effective touch signal. The change of the temperature signal of the touch electrode in the touch area can represent the change of the dielectric constant of the material of the touch electrode in the touch area with temperature.

[0108] Referring to FIG. 8, a waveform diagram of the temperature signal is shown. In FIG. 8, as the touching time of the touch object increases, the temperature of the touch electrode in the touch area also gradually increases and gradually tends to be stable.

[0109] As can be seen from the above, by using the signal processing method provided in the embodiment of the present application, the effective touch signal corresponding to the touch operation and the temperature signal can be separated.

[0110] Referring to FIG. 9, a touch chip 90 in an embodiment of the present application is shown, which includes an obtaining module 901 and a processing module 902, wherein,

[0111] The acquisition module 901 is configured to detect a touch operation on the touch device, and acquire a first type of capacitance signal amount and a second type of capacitance signal amount of a touch electrode in a touch area; the first type of capacitance signal amount comprises a first effective touch signal amount and a first capacitance change amount, and the second type of capacitance signal amount comprises a second effective touch signal amount and a second capacitance change amount; the first effective touch signal amount and the second effective touch signal amount are associated with the touch operation, and the first capacitance change amount and the second capacitance change amount are associated with a real-time temperature of the touch electrode in the touch area.

[0112] The processing module 902 is configured to determine an effective touch signal of the touch electrode in the touch area based on the first effective touch signal amount and the second effective touch signal amount, and the effective touch signal of the touch electrode in the touch area is irrelevant to the real-time temperature of the touch electrode in the touch area.

[0113] In specific implementation, the specific execution process of the acquisition module 901 and the processing module 902 described above can correspond to steps 101-102, which will not be described herein.

[0114] In specific implementation, the touch chip 90 can further comprise a storage module 903 configured to store a temperature coefficient of the touch electrode; the temperature coefficient of the touch electrode is K=T s / T m , wherein T s satisfies T s =(S2-S1) / (X2-X1), T m satisfies T m =(M2-M1) / (X2-X1), S1 is the first type of capacitance signal amount when the real-time temperature of the touch electrode is X1, and S2 is the first type of capacitance signal amount when the real-time temperature of the touch electrode is X2; M1 is the second type of capacitance signal amount when the real-time temperature of the touch electrode is X1, and M2 is the second type of capacitance signal amount when the real-time temperature of the touch electrode is X2.

[0115] In specific implementation, the touch electrodes of the touch device comprise a plurality of driving electrodes and receiving electrodes arranged in a cross-insulation manner or a layered manner, at least part of the touch electrodes each have a corresponding temperature coefficient K and are stored in the storage module 903; the effective touch signal of the driving electrode and the effective touch signal of the receiving electrode are used to determine position information of the touch area on the touch device.

[0116] In specific implementation, the touch electrodes of the touch device are arranged in a dot matrix or a strip shape, and at least part of the touch electrodes each have a corresponding temperature coefficient K and are stored in the storage module 903.

[0117] In specific implementations, each module / unit included in each device or product described in the above embodiments can be a software module / unit or a hardware module / unit, or can be partially a software module / unit and partially a hardware module / unit.

[0118] For example, for each device or product applied to or integrated in a chip, each module / unit included therein can be implemented in the form of hardware such as a circuit, or at least part of the modules / units can be implemented in the form of a software program running on a processor integrated in the chip, and the remaining (if any) modules / units can be implemented in the form of hardware such as a circuit; for each device or product applied to or integrated in a chip module, each module / unit included therein can be implemented in the form of hardware such as a circuit, and different modules / units can be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least part of the modules / units can be implemented in the form of a software program running on a processor integrated in the chip module, and the remaining (if any) modules / units can be implemented in the form of hardware such as a circuit; for each device or product applied to or integrated in a terminal, each module / unit included therein can be implemented in the form of hardware such as a circuit, and different modules / units can be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the terminal, or at least part of the modules / units can be implemented in the form of a software program running on a processor integrated in the terminal, and the remaining (if any) modules / units can be implemented in the form of hardware such as a circuit.

[0119] The embodiment of the present application further provides a computer readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and has a computer program stored thereon, and the computer program is run by a processor to perform the steps of the signal processing method provided in any of the above embodiments.

[0120] The embodiment of the present application further provides a computer program product, which includes computer programs / instructions, and the computer programs / instructions are executed by a processor to implement the steps of the signal processing method provided in any of the above embodiments.

[0121] The embodiment of the present application further provides another touch device, which includes a touch electrode and a touch chip connected to each other, and the touch chip can perform the steps of the signal processing method provided in the above embodiments.

[0122] Those skilled in the art can understand that all or part of the steps in the above embodiments can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium, which can include ROM, RAM, magnetic or optical disk, etc.

[0123] Although the present application has been disclosed with reference to the above examples, it is not intended to limit the present application. Any person skilled in the art, without departing from the spirit and scope of the present application, can make various changes and modifications, and the scope of protection of the present application should be limited by the scope defined in the claims.

Claims

1. A signal processing method applied to a touch device, the method comprising: The method comprises: detecting a touch operation on the touch device, and obtaining a first type of capacitance signal amount and a second type of capacitance signal amount of a touch electrode in a touch area, the first type of capacitance signal amount comprising a first effective touch signal amount and a first capacitance variation amount, and the second type of capacitance signal amount comprising a second effective touch signal amount and a second capacitance variation amount; the first effective touch signal amount and the second effective touch signal amount are associated with the touch operation; and the first capacitance variation amount and the second capacitance variation amount are associated with a real-time temperature of the touch electrode in the touch area; determining an effective touch signal of the touch electrode in the touch area based on the first effective touch signal amount and the second effective touch signal amount, the effective touch signal of the touch electrode in the touch area being irrelevant to the real-time temperature of the touch electrode in the touch area.

2. The signal processing method of claim 1, wherein, The first type of capacitive signal quantity is S: S=D s +△C s The second type of capacitive signal quantity is M: M=D m +△C m Wherein: D s is the first effective touch signal quantity, D m is the second effective touch signal quantity; △C s is the first capacitive change quantity, and △C s =X×T s ; △C m is the second capacitive change quantity, and △C m =X×T m , X is the real-time temperature of the touch control electrode in the touch area; T s is the first temperature change rate, T m is the second temperature change rate, T s is the same as the sign of D s , T m is opposite to the sign of D m ; or, when T s is opposite to the sign of D s , T m is the same as the sign of D m .

3. The signal processing method of claim 2, wherein, The method of determining the effective touch signal of the touch electrode in the touch area based on the first effective touch signal amount and the second effective touch signal amount comprises: obtaining a first coefficient p and a second coefficient q, p and q satisfying: p x T s = q x T m ; The effective touch signal of the touch electrode in the touch area is Signal: Signal = p x D s -q x D m .

4. The signal processing method of claim 2, wherein, after obtaining the first type of capacitance signal amount and the second type of capacitance signal amount of the touch electrode in the touch area, further comprising: a third coefficient a and a fourth coefficient b are obtained, a and b satisfying a x D s + b x D m = 0; determining a temperature signal Temp of the touch electrode in the touch area as Temp = a x AC s + b x AC m and the temperature signal Temp is associated with a real-time temperature of the touch electrode in the touch area.

5. The signal processing method of claim 2, wherein, D s satisfies D s = S1-S0, D m satisfies D m = M1-M0; wherein S0 is the first type of capacitance signal amount when there is no touch operation on the touch electrode, M0 is the second type of capacitance signal amount when there is no touch operation on the touch electrode, S1 is the first type of capacitance signal amount at an initial moment of the touch operation on the touch electrode, and M1 is the second type of capacitance signal amount at the initial moment of the touch operation on the touch electrode.

6. A signal processing method according to any one of claims 2 to 5, characterized in that, T s satisfies: T s =(S2-S1) / (X2-X1), T m satisfies T m =(M2-M1) / (X2-X1); wherein S1 is a first type of capacitive signal amount when the real-time temperature of the touch electrode in the touch area is X1, S2 is a first type of capacitive signal amount when the real-time temperature of the touch electrode in the touch area is X2; M1 is a second type of capacitive signal amount when the real-time temperature of the touch electrode in the touch area is X1, and M2 is a second type of capacitive signal amount when the real-time temperature of the touch electrode in the touch area is X2.

7. The method of claim 1, wherein, The first type of capacitance is self-capacitance of the touch electrode in the touch area, and the second type of capacitance is mutual capacitance of the touch electrode in the touch area; or the first type of capacitance is mutual capacitance of the touch electrode in the touch area, and the second type of capacitance is self-capacitance of the touch electrode in the touch area.

8. A touch chip connecting a plurality of touch electrodes of a touch device, characterized in that, The method comprises: a obtaining module configured to detect a touch operation on a touch device, and obtain a first type of capacitance signal amount and a second type of capacitance signal amount of a touch electrode in a touch area; the first type of capacitance signal amount comprises a first effective touch signal amount and a first capacitance variation amount, and the second type of capacitance signal amount comprises a second effective touch signal amount and a second capacitance variation amount; the first effective touch signal amount and the second effective touch signal amount are associated with the touch operation, and the first capacitance variation amount and the second capacitance variation amount are associated with a real-time temperature of the touch electrode in the touch area; a processing module configured to determine an effective touch signal of the touch electrode in the touch area based on the first effective touch signal amount and the second effective touch signal amount, the effective touch signal of the touch electrode in the touch area being irrelevant to the real-time temperature of the touch electrode in the touch area. 9.The touch chip of claim 8, wherein, The method further comprises: A storage module is configured to store a temperature coefficient of the touch electrode, wherein the temperature coefficient of the touch electrode is K=T s / T m wherein T s satisfies T s =(S2-S1) / (X2-X1), T m satisfies T m =(M2-M1) / (X2-X1), S1 is a first type of capacitance signal amount when a real-time temperature of the touch electrode is X1, and S2 is a first type of capacitance signal amount when a real-time temperature of the touch electrode is X2; M1 is a second type of capacitance signal amount when a real-time temperature of the touch electrode is X1, and M2 is a second type of capacitance signal amount when a real-time temperature of the touch electrode is X2. 10.The touch chip of claim 9, wherein, the touch electrode of the touch device comprises a plurality of driving electrodes and receiving electrodes arranged in a cross-insulation manner or in a layered manner, at least part of the touch electrodes have a corresponding temperature coefficient K and are stored in the storage module; and the effective touch signal of the driving electrode and the effective touch signal of the receiving electrode are used to determine position information of the touch area on the touch device. 11.The touch chip of claim 9, wherein, The touch electrodes of the touch device are arranged in a dot matrix or a strip, and at least part of the touch electrodes have a corresponding temperature coefficient K and are stored in the storage module.

12. A touch device comprising a touch electrode and a touch chip connected, characterized in that, The touch chip executes the steps of the signal processing method according to any one of claims 1-7.

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