CN105242804A - Touch compensation circuit, compensating method for touch compensation circuit, touch screen and display apparatus - Google Patents
Touch compensation circuit, compensating method for touch compensation circuit, touch screen and display apparatus Download PDFInfo
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Abstract
The present invention discloses a touch compensation circuit, a compensating method for the touch compensation circuit, a touch screen and a display apparatus. When electric field interference exists in an external environment, a fixed power supply signal input by a power supply signal end is stored and discharged by a charging module, a discharge module and a comparison module, and is compared with a reference signal. When a comparison result between a fixed voltage signal recorded by a final counting module and the reference signal is not equal to a reference result, it is determined that a drift occurs in the reference signal. For example, when the drift in the reference signal becomes larger due to the electric field interference existing in the external environment, the comparison result recorded by the counting module at the moment is less than the reference result, and the reference signal can be adjusted by the comparison module at the moment, i.e., the value of the reference signal is reduced by a feedback signal and is returned to an initial value, or vice versa. Therefore, whether the drift occurs in the reference signal can be detected in different environments, and the drifted reference signal is adjusted correspondingly for ensuring the reference signal to be maintained at a reference level and improving touch sensitivity.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch compensation circuit, a compensation method thereof, a touch screen and a display device.
Background
With the development of touch screen technology, touch technology has been rapidly developed, and various companies have introduced different touch technologies to implement touch display. According to different design principles of touch panels, the touch panels can be classified into resistive touch panels and capacitive touch panels. The capacitive touch screen inputs a driving signal in the X-axis direction in the touch panel, receives an induction signal in the Y-axis direction, and realizes a touch function through a capacitive induction principle. Capacitive touch screens are generally classified into self-contained touch screens and mutual-capacity touch screens. When the finger does not touch the panel, a reference capacitor is arranged between the driving signal and the sensing signal, and when the finger touches the panel, the capacitance between the driving signal and the sensing signal changes due to the fact that a capacitor exists between a human body and the ground. When the input reference voltage signal is unchanged, the change of the charge amount caused by the addition of a human body capacitance is a judgment reference for judging whether finger touch exists.
In addition, with the change of the external environment, for example, when the external environment has an electric field, the reference level in the touch screen is easy to drift, which may cause the change of the reference capacitance in the touch panel, and further cause the inability to detect a smaller touch signal, thereby reducing the touch sensitivity of the touch screen.
Therefore, it is an urgent technical problem for those skilled in the art to calibrate a reference signal in a touch screen, keep the reference signal at a reference level, and improve the sensitivity of the touch screen.
Disclosure of Invention
The embodiment of the invention provides a touch compensation circuit, a touch compensation method, a touch screen and a display device, which are used for solving the problem that in the prior art, the touch sensitivity is reduced due to the fact that reference signals in the touch screen drift.
An embodiment of the present invention provides a touch compensation circuit, including: the device comprises a charging module, a discharging module, a comparing module, a compensating module and a counting module; wherein,
the control end of the charging module is connected with the control signal end, the input end of the charging module is connected with the power supply signal end, and the output end of the charging module is connected with the input end of the discharging module; the charging module is used for charging and storing the signal input by the power supply signal end under the control of the control signal end;
the control end of the discharging module is connected with the control signal end, and the output end of the discharging module is connected with the first input end of the comparing module; the discharging module is used for discharging the signal charged and stored by the charging module to the first input end of the comparing module under the control of the control signal end;
the second input end of the comparison module is used for inputting a reference signal, and the output end of the comparison module is connected with the input end of the counting module; the comparison module is used for comparing the signal output by the discharge module in the discharge process with the reference signal and outputting a counting signal to the input end of the counting module when the voltage value of the signal output by the discharge module in the discharge process reaches the voltage value of the reference signal;
the counting module is used for counting according to the counting signal output by the comparison module;
the input end of the compensation module is used for inputting the reference signal, and the output end of the compensation module is used for outputting a feedback signal; the compensation module is used for determining whether the reference signal drifts according to the counting result of the counting module, and compensating the voltage value of the reference signal according to the feedback signal output by the output end when the reference signal drifts; and when the counting result of the counting module is not equal to the reference result, determining that the reference signal drifts.
In a possible implementation manner, in the touch compensation circuit provided in an embodiment of the present invention, the charging module specifically includes: a first switching device, a first capacitor and a first resistor; wherein,
one end of the first capacitor is connected with the ground level signal end, and the other end of the first capacitor is connected with one end of the first resistor;
the other end of the first resistor is connected with the output end of the first switching device and the input end of the discharging module respectively;
the control end of the first switching device is connected with the control signal end, and the input end of the first switching device is connected with the power supply signal end; the first switch device is used for being turned on under the control of the control signal end, and the first capacitor is charged through a signal input by the power supply signal end.
In a possible implementation manner, in the touch compensation circuit provided in the embodiment of the present invention, the first switching device is a first switching transistor; the grid electrode of the first switch transistor is connected with the control signal end, the source electrode of the first switch transistor is connected with the power signal end, and the drain electrode of the first switch transistor is connected with the input end of the discharging module.
In a possible implementation manner, in the touch compensation circuit provided in an embodiment of the present invention, the charging module is further configured to sense an external touch condition, and when a touch occurs, the charging module further includes: an induction capacitor and an induction resistor;
one end of the induction capacitor is connected with one end of the induction resistor, and the other end of the induction capacitor is respectively connected with one end of the first capacitor and one end of the first resistor;
the other end of the induction resistor is connected with the other end of the first capacitor and the ground level signal end respectively.
In a possible implementation manner, in the touch compensation circuit provided in an embodiment of the present invention, the discharging module specifically includes: a second switching device;
the control end of the second switching device is connected with the control signal end, the input end of the second switching device is connected with the output end of the charging module, and the output end of the second switching device is connected with the first input end of the comparison module; the second switching device is used for being turned on under the control of the control signal end, and discharging the signal charged and stored by the charging module to the first input end of the comparison module.
In a possible implementation manner, in the touch compensation circuit provided in the embodiment of the present invention, the second switching device is a second switching transistor; and the grid electrode of the second switching transistor is connected with the control signal end, the source electrode of the second switching transistor is connected with the output end of the charging module, and the drain electrode of the second switching transistor is connected with the first input end of the comparison module.
In a possible implementation manner, in the touch compensation circuit provided in an embodiment of the present invention, the compensation module specifically includes: a first comparator, a second capacitor and a feedback capacitor; wherein,
a positive input end of the first comparator is connected with the ground level signal end, a negative input end of the first comparator is respectively connected with one end of the second capacitor and one end of the feedback capacitor, a negative input end of the first comparator is used for inputting the reference signal, and an output end of the first comparator is used for outputting the feedback signal;
the other end of the second capacitor is connected with the ground level signal end;
and the other end of the feedback capacitor is connected with the output end of the first comparator.
In a possible implementation manner, in the touch compensation circuit provided in an embodiment of the present invention, the comparison module specifically includes: a second comparator;
and the positive input end of the second comparator is used for inputting the reference signal, the negative input end of the second comparator is connected with the output end of the discharging module, and the output end of the second comparator is connected with the input end of the counting module.
In a possible implementation manner, the touch compensation circuit provided in an embodiment of the present invention further includes: a display module;
the display module is used for displaying the counting result of the counting module.
An embodiment of the present invention provides a compensation method for the touch compensation circuit, which includes:
charging and storing signals input by the power supply signal end;
discharging the charge-stored signal;
comparing the signal output by discharging with the reference signal, and outputting a counting signal when the voltage value of the signal output in the discharging process reaches the voltage value of the reference signal;
counting according to the counting signal;
when the reference signal is determined to drift according to the counting result, compensating the voltage value of the reference signal according to the feedback signal; and when the counting result is not equal to the reference result, determining that the reference signal drifts.
The embodiment of the invention provides a touch screen which comprises the touch compensation circuit provided by the embodiment of the invention.
The embodiment of the invention provides a display device which comprises the touch screen provided by the embodiment of the invention.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a touch control compensation circuit, a compensation method thereof, a touch screen and a display device, wherein the touch control compensation circuit comprises: the device comprises a charging module, a discharging module, a comparing module, a compensating module and a counting module; the charging module is used for charging and storing signals input by the power signal end; the discharging module is used for discharging the signals charged and stored by the charging module to a first input end of the comparing module; the comparison module is used for comparing the signal output by the discharge module in the discharge process with the reference signal and outputting a counting signal to the input end of the counting module when the voltage value of the signal output by the discharge module in the discharge process reaches the voltage value of the reference signal; the counting module is used for counting according to the counting signal output by the comparison module; the compensation module is used for determining whether the reference signal drifts according to the counting result of the counting module and compensating the voltage value of the reference signal according to the feedback signal output by the output end when the reference signal drifts; and when the counting result of the counting module is not equal to the reference result, determining that the reference signal drifts.
Specifically, a fixed power signal input by a power signal end is stored and discharged through a charging module and a discharging module, the fixed power signal is compared with a reference signal through a comparison module, a comparison result is recorded through a counting module, and a comparison result between a fixed voltage value and the reference signal when no touch is generated, namely a reference result when the reference signal does not drift, is determined; when the external environment has electric field interference, the fixed power signal input by the power signal end is stored, discharged and compared with the reference signal through the charging module, the discharging module and the comparing module, and the final counting module records that the comparison result between the fixed voltage signal and the reference signal is not equal to the reference result at the moment, so that the reference signal can be determined to have drift. Therefore, whether the reference signal drifts or not can be detected under different environments, the drifted reference signal is correspondingly adjusted, the reference signal is maintained at the reference level, and the touch sensitivity is improved.
Drawings
Fig. 1 is a schematic structural diagram of a touch compensation circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a touch compensation circuit according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a control signal inputted from a control signal terminal according to an embodiment of the present invention;
fig. 4 is a flowchart of a compensation method of a touch compensation circuit according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of a touch compensation circuit, a touch compensation method thereof, a touch screen, and a display device according to embodiments of the present invention with reference to the accompanying drawings.
An embodiment of the present invention provides a touch compensation circuit, as shown in fig. 1, which may include: the device comprises a charging module 01, a discharging module 02, a comparing module 03, a compensating module 04 and a counting module 05; wherein,
the control end of the charging module 01 is connected with the control signal end S, the input end of the charging module is connected with the power supply signal end Vdd, and the output end of the charging module 01 is connected with the input end of the discharging module 02; the charging module 01 is used for charging and storing a signal input by a power supply signal end Vdd under the control of a control signal end S;
the control end of the discharging module 02 is connected with the control signal end S, and the output end is connected with the first input end of the comparing module 03; the discharging module 02 is used for discharging the signal charged and stored by the charging module 01 to the first input end of the comparing module 03 under the control of the control signal end S;
a second input end of the comparison module 03 is used for inputting a reference signal Vref, and an output end of the comparison module is connected with an input end of the counting module 05; the comparison module 03 is configured to compare the signal output by the discharging module 01 during discharging with the reference signal Vref, and output a counting signal to the input terminal of the counting module 05 when the voltage value of the signal output by the discharging module 02 during discharging reaches the voltage value of the reference signal Vref;
the counting module 05 is used for counting according to the counting signal output by the comparing module 03;
the input end of the compensation module 04 is used for inputting a reference signal Vref, and the output end is used for outputting a feedback signal; the compensation module 04 is configured to determine whether the reference signal Vref drifts according to a counting result of the counting module 05, and compensate a voltage value of the reference signal Vref according to a feedback signal output by the output terminal when the reference signal Vref drifts; when the counting result of the counting module 05 is not equal to the reference result, it is determined that the reference signal Vref drifts.
The touch compensation circuit provided by the embodiment of the invention comprises: the device comprises a charging module, a discharging module, a comparing module, a compensating module and a counting module. Specifically, a fixed power signal input by a power signal end is stored and discharged through a charging module and a discharging module, the fixed power signal is compared with a reference signal through a comparison module, a comparison result is recorded through a counting module, and a comparison result between a fixed voltage value and the reference signal when no touch is generated, namely a reference result when the reference signal does not drift, is determined; when the external environment has electric field interference, the fixed power signal input by the power signal end is stored, discharged and compared with the reference signal through the charging module, the discharging module and the comparing module, and the final counting module records that the comparison result between the fixed voltage signal and the reference signal is not equal to the reference result at the moment, so that the reference signal can be determined to have drift. Therefore, whether the reference signal drifts or not can be detected under different environments, the drifted reference signal is correspondingly adjusted, the reference signal is maintained at the reference level, and the touch sensitivity is improved.
In a specific implementation, as shown in fig. 2, in the touch compensation circuit provided in the embodiment of the present invention, the charging module 01 may specifically include: a first switching device, a first capacitor C1 and a first resistor R1; one end of the first capacitor C1 is connected to the ground level signal terminal GND, and the other end is connected to one end of the first resistor R1; the other end of the first resistor R1 is respectively connected with the output end of the first switching device and the input end of the discharging module 02; the control end of the first switching device is connected with the control signal end S, and the input end of the first switching device is connected with the power supply signal end Vdd; the first switch device is turned on under the control of the control signal terminal S, and charges the first capacitor C1 by a signal inputted from the power signal terminal Vdd.
Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the first switch device is turned on under the control of the control signal terminal, so that the signal input from the power signal terminal charges the first capacitor. Therefore, the fixed voltage signal input by the power signal end can be stored, the stored fixed voltage signal is discharged through the discharging module and is compared with the reference signal through the comparing module, and the counting module records the comparison result, so that whether the reference signal drifts or not can be determined.
In a specific implementation, in the touch compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the first switching device is a first switching transistor T1; the first switching transistor T1 has a gate connected to the control signal terminal S, a source connected to the power signal terminal Vdd, and a drain connected to the input terminal of the discharging module 02. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the first switching transistor T1 is turned on under the control of the control signal terminal S, so that the first capacitor C1 can be charged by the Vdd input of the power signal terminal, thereby implementing the charging and storing of the fixed voltage signal.
In a specific implementation, in the touch compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the charging module 01 may be further configured to sense an external touch condition, and when a touch occurs, the charging module 01 may further include: a sensing capacitor C2 and a sensing resistor R2; one end of the sensing capacitor C2 is connected with one end of the sensing resistor R2, and the other end of the sensing capacitor C2 is respectively connected with one end of the first capacitor C1 and one end of the first resistor R1; the other end of the sensing resistor R1 is connected to the other end of the first capacitor C1 and the ground level signal terminal GND, respectively. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the charging module 01 may further sense an external touch condition, the sensing capacitor C2 simulates a capacitor generated when a human hand touches, the sensing capacitor C2 and the sensing resistor R2 do not exist when the human hand does not touch, and at this time, when a high level signal is input to the control signal terminal S (a signal input to the control signal terminal is shown in fig. 3), the first switch transistor T1 is turned on, and then a signal input to the power signal terminal Vdd charges the first capacitor C1; when the control signal terminal S inputs a low level signal, the first switching transistor T1 is turned off, the first capacitor C1 discharges through the discharging module, and the counting module counts how many times the first capacitor C1 discharges to reach the voltage value of the reference signal Vref according to the counting signal output by the comparing module, and records the counting result; when a human hand touches the touch panel, a loop of the sensing capacitor C2, the sensing resistor R2, the first capacitor C1 and the first resistor R1 exists, and at this time, under the control of the control signal terminal S, a signal input by the power signal terminal Vdd not only charges the first capacitor C1 but also charges the sensing capacitor C2, and when the signal is discharged through the discharging module, the number of times counted by the counting module to reach the voltage value of the reference signal Vref is certainly greater than that when no human hand touches the touch panel because the amount of the stored charge is increased. Thus, the touch detection can be realized to determine the occurrence of touch.
In a possible implementation manner, in the touch compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the discharging module 02 may specifically include: a second switching device; the control end of the second switching device is connected with the control signal end S, the input end of the second switching device is connected with the output end of the charging module 01, and the output end of the second switching device is connected with the first input end of the comparison module 03; the second switching device is used for being turned on under the control of the control signal terminal S, and discharging the signal charged and stored by the charging module 01 to the first input terminal of the comparing module 03. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the second switch device is turned on under the control of the control signal terminal, discharges the charges stored in the charging module, and outputs the charges to the comparing module for comparison with the reference signal, so as to finally determine whether the reference signal drifts and determine whether a touch occurs.
In a specific implementation, in the touch compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the second switching device is a second switching transistor T2; the gate of the second switching transistor T2 is connected to the control signal terminal S, the source is connected to the output terminal of the charging module 01, and the drain is connected to the first input terminal of the comparing module 03. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the second switching transistor T2 is turned on under the control of the control signal terminal S, so as to discharge the voltage signal charged and stored by the charging module 01.
In a specific implementation, as shown in fig. 2, in the touch compensation circuit provided in the embodiment of the present invention, the compensation module 04 may specifically include: a first comparator B1, a second capacitor C3, and a feedback capacitor C4; the positive input end of the first comparator B1 is connected with the ground level signal end GND, the negative input end is respectively connected with one end of the second capacitor C3 and one end of the feedback capacitor C4, the negative input end is used for inputting a reference signal Vref, and the output end is used for outputting a feedback signal; the other end of the second capacitor C3 is connected with the ground level signal terminal GND; the other end of the feedback capacitor C4 is connected to the output of the first comparator B1. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, when the reference signal drifts, the feedback capacitor may be adjusted according to the feedback signal, so as to correspondingly adjust the reference signal.
In a specific implementation, as shown in fig. 2, in the touch compensation circuit provided in the embodiment of the present invention, the comparing module 03 may specifically include: a second comparator B2; the positive input end of the second comparator B2 is used for inputting the reference signal Vref, the negative input end is connected to the output end of the discharging module 02, and the output end is connected to the input end of the counting module 05. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the comparing module 03 may be implemented by the second comparator B2, and further compare the electric charge discharged by the discharging module 02 with the reference signal Vref, and output the counting signal once when the voltage value of the reference signal Vref is reached in the discharging process, and count through the counting module 05, so as to finally determine whether the reference signal drifts, and also determine whether there is a finger touch.
It should be noted that, in the touch compensation circuit provided in the embodiment of the present invention, the counting module may be implemented by using a counter, and the working principle and implemented function of the comparator and the counter used in the embodiment of the present invention are the same as those of the comparator and the counter in the prior art, which are not described in detail herein.
In a specific implementation, the touch compensation circuit provided in the embodiment of the present invention may further include: a display module; the display module is used for displaying the counting result of the counting module. Specifically, in the touch compensation circuit provided in the embodiment of the present invention, the result recorded by the counting module may be displayed by the display module, so as to conveniently determine whether the reference signal drifts and whether there is touch release, and when it is determined that the reference signal drifts, the compensation module is used to adjust the reference signal.
Based on the same inventive concept, an embodiment of the present invention provides a compensation method for the touch compensation circuit, which includes the following steps, as shown in fig. 4:
s101, charging and storing a signal input by a power supply signal end;
s102, discharging the charged and stored signals;
s103, comparing the signal output by discharging with a reference signal, and outputting a counting signal when the voltage value of the signal output in the discharging process reaches the voltage value of the reference signal;
s104, counting according to the counting signal;
s105, when the reference signal is determined to drift according to the counting result, compensating the voltage value of the reference signal according to the feedback signal; and when the counting result is not equal to the reference result, determining that the reference signal drifts.
Specifically, in the compensation method of the touch compensation circuit provided in the embodiment of the present invention, the fixed power signal input from the power signal terminal is charged, stored and discharged, and then compared with the reference signal, and a result of comparison between the fixed voltage value and the reference signal when no touch occurs, that is, a reference result when the reference signal does not drift, is determined according to the recorded comparison result; when the external environment has electric field interference, the fixed power signal input at the power signal end is charged, stored, discharged and compared with the reference signal, and the comparison result between the most recorded fixed voltage signal and the reference signal is not equal to the reference result, that is, the reference signal can be determined to have drift. Therefore, whether the reference signal drifts or not can be detected under different environments, the drifted reference signal is correspondingly adjusted, the reference signal is maintained at the reference level, and the touch sensitivity is improved.
Based on the same inventive concept, an embodiment of the present invention provides a touch screen, including the touch compensation circuit provided in the embodiment of the present invention. Because the principle of solving the problems of the touch screen is similar to that of the touch compensation circuit, the implementation of the touch screen can refer to the implementation of the touch compensation circuit, and repeated details are not repeated.
Based on the same inventive concept, an embodiment of the present invention provides a display device, including the touch screen provided in the embodiment of the present invention. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Because the principle of the display device for solving the problems is similar to that of the touch screen, the implementation of the display device can be referred to the implementation of the touch screen, and repeated details are not repeated.
The embodiment of the invention provides a touch control compensation circuit, a compensation method thereof, a touch screen and a display device, wherein the touch control compensation circuit comprises: the device comprises a charging module, a discharging module, a comparing module, a compensating module and a counting module; the charging module is used for charging and storing signals input by the power signal end; the discharging module is used for discharging the signals charged and stored by the charging module to a first input end of the comparing module; the comparison module is used for comparing the signal output by the discharge module in the discharge process with the reference signal and outputting a counting signal to the input end of the counting module when the voltage value of the signal output by the discharge module in the discharge process reaches the voltage value of the reference signal; the counting module is used for counting according to the counting signal output by the comparison module; the compensation module is used for determining whether the reference signal drifts according to the counting result of the counting module and compensating the voltage value of the reference signal according to the feedback signal output by the output end when the reference signal drifts; and when the counting result of the counting module is not equal to the reference result, determining that the reference signal drifts. Specifically, a fixed power signal input by a power signal end is stored and discharged through a charging module and a discharging module, the fixed power signal is compared with a reference signal through a comparison module, a comparison result is recorded through a counting module, and a comparison result between a fixed voltage value and the reference signal when no touch is generated, namely a reference result when the reference signal does not drift, is determined; when the external environment has electric field interference, the fixed power signal input by the power signal end is stored and discharged through the charging module, the discharging module and the comparing module, and is compared with a reference signal which has drifted, and the final counting module records that the comparison result between the fixed voltage signal and the reference signal is not equal to the reference result at the moment, so that the drift of the reference signal can be determined. Therefore, whether the reference signal drifts or not can be detected under different environments, the drifted reference signal is correspondingly adjusted, the reference signal is maintained at the reference level, and the touch sensitivity is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A touch compensation circuit, comprising: the device comprises a charging module, a discharging module, a comparing module, a compensating module and a counting module; wherein,
the control end of the charging module is connected with the control signal end, the input end of the charging module is connected with the power supply signal end, and the output end of the charging module is connected with the input end of the discharging module; the charging module is used for charging and storing the signal input by the power supply signal end under the control of the control signal end;
the control end of the discharging module is connected with the control signal end, and the output end of the discharging module is connected with the first input end of the comparing module; the discharging module is used for discharging the signal charged and stored by the charging module to the first input end of the comparing module under the control of the control signal end;
the second input end of the comparison module is used for inputting a reference signal, and the output end of the comparison module is connected with the input end of the counting module; the comparison module is used for comparing the signal output by the discharge module in the discharge process with the reference signal and outputting a counting signal to the input end of the counting module when the voltage value of the signal output by the discharge module in the discharge process reaches the voltage value of the reference signal;
the counting module is used for counting according to the counting signal output by the comparison module;
the input end of the compensation module is used for inputting the reference signal, and the output end of the compensation module is used for outputting a feedback signal; the compensation module is used for determining whether the reference signal drifts according to the counting result of the counting module, and compensating the voltage value of the reference signal according to the feedback signal output by the output end when the reference signal drifts; and when the counting result of the counting module is not equal to the reference result, determining that the reference signal drifts.
2. The touch compensation circuit of claim 1, wherein the charging module specifically comprises: a first switching device, a first capacitor and a first resistor; wherein,
one end of the first capacitor is connected with the ground level signal end, and the other end of the first capacitor is connected with one end of the first resistor;
the other end of the first resistor is connected with the output end of the first switching device and the input end of the discharging module respectively;
the control end of the first switching device is connected with the control signal end, and the input end of the first switching device is connected with the power supply signal end; the first switch device is used for being turned on under the control of the control signal end, and the first capacitor is charged through a signal input by the power supply signal end.
3. The touch compensation circuit of claim 2, wherein the first switching device is a first switching transistor; the grid electrode of the first switch transistor is connected with the control signal end, the source electrode of the first switch transistor is connected with the power signal end, and the drain electrode of the first switch transistor is connected with the input end of the discharging module.
4. The touch compensation circuit of claim 3, wherein the charging module is further configured to sense an external touch condition, and when a touch occurs, the charging module further comprises: an induction capacitor and an induction resistor;
one end of the induction capacitor is connected with one end of the induction resistor, and the other end of the induction capacitor is respectively connected with one end of the first capacitor and one end of the first resistor;
the other end of the induction resistor is connected with the other end of the first capacitor and the ground level signal end respectively.
5. The touch compensation circuit of claim 1, wherein the discharge module specifically comprises: a second switching device;
the control end of the second switching device is connected with the control signal end, the input end of the second switching device is connected with the output end of the charging module, and the output end of the second switching device is connected with the first input end of the comparison module; the second switching device is used for being turned on under the control of the control signal end, and discharging the signal charged and stored by the charging module to the first input end of the comparison module.
6. The touch compensation circuit of claim 5, wherein the second switching device is a second switching transistor; and the grid electrode of the second switching transistor is connected with the control signal end, the source electrode of the second switching transistor is connected with the output end of the charging module, and the drain electrode of the second switching transistor is connected with the first input end of the comparison module.
7. The touch compensation circuit of claim 1, wherein the compensation module specifically comprises: a first comparator, a second capacitor and a feedback capacitor; wherein,
a positive input end of the first comparator is connected with the ground level signal end, a negative input end of the first comparator is respectively connected with one end of the second capacitor and one end of the feedback capacitor, a negative input end of the first comparator is used for inputting the reference signal, and an output end of the first comparator is used for outputting the feedback signal;
the other end of the second capacitor is connected with the ground level signal end;
and the other end of the feedback capacitor is connected with the output end of the first comparator.
8. The touch compensation circuit of claim 1, wherein the comparison module specifically comprises: a second comparator;
and the positive input end of the second comparator is used for inputting the reference signal, the negative input end of the second comparator is connected with the output end of the discharging module, and the output end of the second comparator is connected with the input end of the counting module.
9. The touch compensation circuit of any of claims 1-8, further comprising: a display module;
the display module is used for displaying the counting result of the counting module.
10. A compensation method of the touch compensation circuit according to any one of claims 1 to 9, comprising:
charging and storing signals input by the power supply signal end;
discharging the charge-stored signal;
comparing the signal output by discharging with the reference signal, and outputting a counting signal when the voltage value of the signal output in the discharging process reaches the voltage value of the reference signal;
counting according to the counting signal;
when the reference signal is determined to drift according to the counting result, compensating the voltage value of the reference signal according to the feedback signal; and when the counting result is not equal to the reference result, determining that the reference signal drifts.
11. A touch screen comprising the touch compensation circuit of any of claims 1-9.
12. A display device characterized by comprising the touch screen according to claim 11.
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