Touch control and display driving circuit, touch control and display driving method, chip and equipment

Abstract

The invention discloses a touch and display driving circuit, a touch and display driving method, a chip and equipment, and relates to the technical field of electronics. The circuit comprises a clock signal generator used for outputting a first clock signal to a power generator in a display stage and outputting a second clock signal to the power generator in a touch stage, the first clock signal having high and low level switching, and the second clock signal having no high and low level switching; the power generator is used for providing a first voltage signal for the display driver based on a first clock signal and entering a high impedance state based on a second clock signal; the display driver is used for driving a display screen to display an image based on the first voltage signal; the modulation pulse generator is used for transmitting a pulse signal to the touch sensor, and the pulse signal is used for the touch sensor to obtain a reference signal used for determining the touch position. As the power generator enters the high-impedance state in the touch stage, switching noise is not generated, the pulse signal does not have noise caused by the switching noise, and the quality is high.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and particularly to a touch and display driving circuit, a touch and display driving method, a chip, and a device. Background Art

[0002] In a touch and display driving circuit, a display driving circuit and a touch control circuit are integrated. Therefore, the signals in the touch and display driving circuit are relatively complex. Due to the complexity of the signals, crosstalk and coupling are likely to occur between the signals, resulting in a reduction in signal quality. For example, in a touch and display driving circuit, there is a pulse signal for determining the touch position. This pulse signal is highly sensitive to noise. Even if there is a very small amount of noise in the pulse signal, the quality of the pulse signal will deteriorate, affecting the subsequent effect of determining the touch position.

[0003] Therefore, a touch and display driving circuit is needed to control the noise in the pulse signal, thereby ensuring the subsequent effect of determining the touch position. Summary of the Invention

[0004] This application provides a touch and display driving circuit, a touch and display driving method, a chip, and an electronic device for controlling the noise in a pulse signal. The technical solutions are as follows:

[0005] In a first aspect, a touch and display driving circuit is provided. The circuit includes: a clock signal generator, a power generator, a display driver, and a modulation pulse generator; the clock signal generator is connected to the power generator and is configured to output a first clock signal to the power generator during the display phase and a second clock signal to the power generator during the touch phase. The first clock signal is a signal with high and low level switching, and the second clock signal is a signal without high and low level switching; the power generator is further connected to the display driver and is configured to transmit a first voltage signal to the display driver based on the first clock signal and enter a high impedance state based on the second clock signal; the display driver is configured to drive the display screen to display an image based on the first voltage signal; the modulation pulse generator is configured to transmit a pulse signal to the touch sensor, and the pulse signal is used for the touch sensor to obtain a reference signal for determining the touch position.

[0006] In some embodiments, the clock signal generator is configured to output the first clock signal or the second clock signal to the power generator based on at least one of a touch enable signal or a display enable signal and a reference clock signal; wherein, the reference clock signal is a signal with high and low level switching, the touch enable signal is a low-level signal during the display phase and a high-level signal during the touch phase, and the display enable signal is a high-level signal during the display phase and a low-level signal during the touch phase.

[0007] In some embodiments, the clock signal generator is an AND gate or a NAND gate.

[0008] In some embodiments, the circuit further includes: a first switch and a capacitor; the first switch is respectively connected to the capacitor and the modulation pulse generator, and is configured to be turned on during the display phase to disconnect the connection between the capacitor and the modulation pulse generator, and to be closed during the touch phase to establish the connection between the capacitor and the modulation pulse generator; the modulation pulse generator is further configured to transmit a pulse signal to the capacitor during the touch phase; the capacitor is further connected to the display driver, and is configured to provide a second voltage signal to the display driver based on the pulse signal and the stored electric charge during the touch phase, so that the driver drives the display screen to display an image based on the second voltage signal.

[0009] In some embodiments, the circuit further includes: a second switch; the second switch is respectively connected to the capacitor and the system reference, and is configured to be closed during the display phase to establish the connection between the capacitor and the system reference, and to be turned on during the touch phase to disconnect the connection between the capacitor and the system reference; the capacitor is further connected to the power generator, and is configured to be charged based on the first voltage signal during the display phase.

[0010] In a second aspect, a touch and display driving method is provided. The method includes: during the display phase, outputting a first clock signal from the clock signal generator to the power generator, providing a first voltage signal from the power generator to the display driver based on the first clock signal, and driving the display screen to display an image by the display driver based on the first voltage signal, where the first clock signal is a signal with high and low level switching; during the touch phase, outputting a second clock signal from the clock signal generator to the power generator, so that the power generator enters a high impedance state based on the second clock signal, and transmitting a pulse signal from the modulation pulse generator to the touch sensor, where the second clock signal is a signal without high and low level switching, and the pulse signal is used for the touch sensor to obtain a reference signal for determining the touch position.

[0011] In some embodiments, during the display phase, outputting a first clock signal from the clock signal generator to the power generator and during the touch phase, outputting a second clock signal from the clock signal generator to the power generator includes: outputting a first clock signal or a second clock signal from the clock signal generator to the power generator based on at least one of a touch enable signal or a display enable signal and a reference clock signal; where the reference clock signal is a signal with high and low level transitions, the touch enable signal is a low-level signal during the display phase and a high-level signal during the touch phase, and the display enable signal is a high-level signal during the display phase and a low-level signal during the touch phase.

[0012] In some embodiments, the method further includes: in the display stage, disconnecting the connection between the capacitor and the modulation pulse generator by turning on the first switch; in the touch stage, connecting the capacitor and the modulation pulse generator by closing the first switch, providing a pulse signal to the capacitor through the modulation pulse generator, and providing a second voltage signal to the display driver by the capacitor based on the pulse signal and the stored electric quantity, so that the display driver drives the display screen to display an image based on the second voltage signal.

[0013] In a third aspect, a touch and display driving chip is provided, and the chip includes the touch and display driving circuit according to any one of the first aspect.

[0014] In a fourth aspect, an electronic device is provided, and the electronic device includes the chip in the third aspect.

[0015] The technical solution provided by this application at least brings the following beneficial effects:

[0016] In the solution provided by the embodiments of this application, the power generator enters a high impedance state in the touch stage, so that the power generator is equivalent to a disconnected component in the touch stage and does not generate switching noise. Therefore, in the pulse signal transmitted by the modulation pulse generator to the touch sensor, no noise caused by switching noise is introduced, the noise in the pulse signal is less, and the quality is higher. Furthermore, in the case of using the pulse signal to obtain a signal for determining the touch position, since the quality of the pulse signal is good, the effect of obtaining a signal for determining the touch position based on the pulse signal is good, which is beneficial to ensuring the accuracy of the signal for determining the touch position obtained. Description of the Drawings

[0017] Figure 1 is a schematic diagram of supplying power to a gate driver provided by an embodiment of this application;

[0018] Figure 2 is a schematic diagram of the connection between a touch sensor and a modulation pulse generator provided by an embodiment of this application;

[0019] Figure 3 is a schematic diagram of voltage signals in different stages provided by an embodiment of this application;

[0020] Figure 4 is a waveform diagram of the display stage and the touch stage provided by an embodiment of this application;

[0021] Figure 5 is a schematic structural diagram of a touch and display driving circuit provided by an embodiment of this application;

[0022] Figure 6 is a schematic structural diagram of a power generator provided by an embodiment of this application;

[0023] Figure 7 is a schematic structural diagram of another touch and display driving circuit provided by an embodiment of the present application;

[0024] Figure 8 is a waveform diagram of another display stage and touch stage provided by an embodiment of the present application;

[0025] Figure 9 is a flowchart of a touch and display driving method provided by an embodiment of the present application;

[0026] Figure 10 is a schematic structural diagram of a touch and display driving chip provided by an embodiment of the present application;

[0027] Figure 11 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0029] In a touch and display driving circuit, a display driving circuit and a touch control circuit are integrated. For example, the touch and display driving circuit is a touch and display driver integration (TDDI) circuit. The TDDI includes a touch sensor, a timing controller, a gate driver, a source driver, a power generator, a modulation pulse generator, and the like. Since the touch and display driving circuit integrates multiple circuits, the signals in the touch and display driving circuit are relatively complex.

[0030] When wiring the touch and display driving circuit based on semiconductor devices, due to the relatively complex signals, crosstalk and coupling are likely to occur between the signals, resulting in a decrease in signal quality. For example, in the touch and display driving circuit, there is a pulse signal for determining the touch position. This pulse signal is highly sensitive to noise. Even if there is a very small amount of noise in the pulse signal, the quality of the pulse signal will deteriorate, affecting the subsequent effect of determining the touch position. Therefore, a touch and display driving circuit is needed to control the noise in the pulse signal, thereby ensuring the subsequent effect of determining the touch position.

[0031] Figure 1 is a schematic diagram of supplying power to a gate driver provided by an embodiment of the present application. As Figure 1As shown, the gate driver is respectively connected to the power generator and the capacitor C1, and the power generator is also connected to the capacitor C1. The capacitor C1 is further respectively connected to the first switch SW1 and the second switch SW2. The first switch SW1 is further respectively connected to the modulation pulse generator, and the modulation pulse generator is also connected to the touch sensor. The second switch SW2 is also connected to the system reference. Among them, the power generator can be a high-power generator. For example, the power generator is a charge pump for a booster. The gate driver, the power generator, the capacitor C1, the first switch SW1, the second switch SW2, the touch sensor, and the modulation pulse generator can all be included in the touch and display driver circuit.

[0032] The power generator is used to receive the clock signal (pump_clk), generate a voltage signal based on this clock signal, and provide the generated voltage signal to the gate driver. Among them, this clock signal is a signal with high and low level switching. The gate driver is used to drive the display screen to display an image. The first switch SW1 is used to open during the display stage to disconnect the connection between the capacitor C1 and the modulation pulse generator, and close during the touch stage to achieve the connection between the capacitor C1 and the modulation pulse generator. The second switch SW2 is used to close during the display stage to achieve the connection between the capacitor C1 and the system reference, and open during the touch stage to disconnect the connection between the capacitor C1 and the system reference. The first switch SW1 and the second switch SW2 can be referred to as being used to select the display stage or the touch stage. In the case of selecting the display stage, the first switch SW1 is open and the second switch SW2 is closed; in the case of selecting the touch stage, the first switch SW1 is closed and the second switch SW2 is open. The capacitor C1 is used to stabilize and modulate the voltage signal received by the gate driver. Since the voltage signal received by the gate driver can be used to make the gate driver work, this voltage signal can be called the power supply voltage signal of the gate driver. The system reference can be ground (GND).

[0033] The modulation pulse generator is used to generate a pulse signal for touch sensing. This pulse signal is input into the touch sensor, and the touch sensor obtains a signal for determining the touch position based on this pulse signal and the sensed signal transmitted by the touch screen. For example, the touch sensor demodulates the sensed signal based on the received pulse signal to obtain a signal for determining the touch position. Among them, the process of demodulating the sensed signal based on the received pulse signal can refer to the solution in the related art for determining the touch position by measuring the change in self-capacitance. The sensed signal transmitted by the touch screen received by the touch sensor can be the sensed signal transmitted by the receiving electrode of the touch screen. Furthermore, the modulation pulse generator can also be connected to the touch driver, and the touch driver is also connected to the transmitting electrode of the touch screen. The modulation pulse generator transmits a pulse signal to the touch driver, and the touch driver transmits a driving signal to the transmitting electrode of the touch screen based on the received pulse signal. In the solution for measuring the change in self-capacitance, the same electrode in the touch circuit can serve as both the transmitting electrode and the receiving electrode. Exemplarily, the touch driver transmits a driving signal to an electrode of the touch circuit based on the received pulse signal, and then, the touch sensor receives the signal transmitted by this electrode and uses this signal as the received sensed signal. As Figure 1 shown, the pulse signal output by the modulation pulse generator is Vmod, and the pulse signal input into the touch sensor is Vmod1. The pulse signal Vmod and the pulse signal Vmod1 can be the same or different.

[0034] Figure 2 is a schematic connection diagram of a touch sensor and a modulation pulse generator provided by an embodiment of the present application. As Figure 2 shown, during the process of transmitting the pulse signal Vmod to the touch sensor, the pulse signal Vmod may be interfered by noise from the power generator, resulting in the pulse signal Vmod1 input into the touch sensor being different from the pulse signal Vmod output by the modulation pulse generator. Furthermore, as Figure 2 shown, when the touch sensor and the modulation pulse generator are connected by metal wiring, due to the resistance of the metal, the pulse signal Vmod1 can also be regarded as the pulse signal Vmod transmitted to the touch sensor after passing through the resistance of the metal wiring.

[0035] During the display stage, the first switch SW1 is opened to disconnect the connection between the capacitor C1 and the modulation pulse generator, and the second switch SW2 is closed to achieve the connection between the capacitor C1 and the system reference. The power supply voltage signal of the gate driver is the voltage signal provided by the power generator. Figure 3 is a schematic diagram of voltage signals in different stages provided by an embodiment of the present application. Among them, the system reference is GND. Refer to Figure 3, in the display stage, the first switch SW1 is turned on and the second switch SW2 is closed. The power supply voltage signal VG of the gate driver provides the voltage signal VG0 for the power generator, that is, the waveforms of VG and VG0 are the same. In the touch stage, the first switch SW1 is closed to connect the capacitor C1 to the modulation pulse generator, and the second switch SW2 is turned on to disconnect the capacitor C1 from the system reference. The pulse signal Vmod1 will be transmitted to the gate driver through the capacitor C1, and the power supply voltage signal VG of the gate driver is the result of modulating VG0 with the pulse signal Vmod1. The embodiment of the present application does not limit the method of modulating VG0 with the pulse signal Vmod1. For example, the pulse signal Vmod1 is superimposed on VG0, and the superimposed result is used as the result of modulating VG0 with the pulse signal Vmod1.

[0036] Please continue to refer to Figure 1 , when the power generator generates the voltage signal VG0 based on pump_clk, since pump_clk has high and low level switching, the power generator will perform switch switching based on the high and low level switching of pump_clk, thereby generating switching noise. Since the first switch SW1 is closed in the touch stage, the switching noise generated by the power generator will enter the pulse signal Vmod1 through the first switch SW1, resulting in a decrease in the signal quality of the pulse signal Vmod1, and further affecting the accuracy of the signal for determining the touch position obtained by the touch sensor based on the pulse signal Vmod1.

[0037] Figure 4 is a waveform diagram of the display stage and the touch stage provided by the embodiment of the present application. Refer to Figure 4 , in the display stage, the first switch SW1 is turned on and the second switch SW2 is closed. Therefore, in the display stage, the display enable signal display_en is at a high level and the touch enable signal touch_en is at a low level. In the touch stage, the first switch SW1 is closed and the second switch SW2 is turned on. Therefore, in the touch stage, the display enable signal display_en is at a low level and the touch enable signal touch_en is at a high level.

[0038] The waveforms of pump_clk, Vmod, VG, the switching noise of the power generator, and Vmod1 in the display stage and the touch stage are as Figure 4 shown. Pump_clk, Vmod, and Vmod1 are all signals with high and low level switching in the display stage and the touch stage. Vmod has a phase delay compared to pump_clk. For example Figure 4The shown Vmod lags behind pump_clk by 1 / 4 cycle. Vmod1 is the same as Vmod during the display stage and is the superposition result of Vmod and switching noise during the touch stage. Since the power generator generates voltage signals based on pump_clk during both the display stage and the touch stage, switching noise exists during both the display stage and the touch stage. Moreover, during the display stage, as the power generator starts to operate, the voltage signal VG received by the gate driver will first increase and then remain stable. Then, during the touch stage, since the voltage signal received by the gate driver can be the signal modulated by using the voltage signal provided to the capacitor by Vmod1, VG can further increase. The waveform diagram of the increased VG has the characteristic of level high and low switching, and the timing of the level high and low switching is consistent with the timing of the level high and low switching of Vmod1. The noise in Vmod1 can be filtered by the capacitor, so that VG can not include the noise in Vmod1.

[0039] The embodiment of the present application provides a touch and display driving circuit for eliminating the switching noise entering the pulse signal Vmod1 during the touch stage, thereby ensuring the quality of the pulse signal Vmod1, and further ensuring the accuracy of the reference signal for determining the touch position obtained based on the pulse signal Vmod1 when the reference signal for determining the touch position is obtained based on the pulse signal Vmod1.

[0040] Figure 5 It is a schematic structural diagram of a touch and display driving circuit provided by an embodiment of the present application. As Figure 5 shown, the touch and display driving circuit includes: a clock signal generator 501, a power generator 502, a display driver 503, and a modulation pulse generator 504. Among them, the clock signal generator 501 is connected to the power generator 502, the power generator 502 is connected to the display driver 503, and the modulation pulse generator 504 is connected to the touch sensor, and the touch sensor can be located inside or outside the touch and display driving circuit. Exemplarily, the display driver 503 is further connected to a display screen located outside the touch and display driving circuit, and the touch sensor can also be connected to a touch circuit located outside the touch and display driving circuit. The embodiment of the present application does not limit the relative orientation and size relationship between the display screen and the touch circuit. For example, the touch circuit is arranged directly below the display screen, and the area of the touch circuit can be larger than the area of the display screen, or equal to the area of the display screen, or smaller than the area of the display screen. Another example is that the touch circuit and the display screen are located in the same area, and the touch circuit and the display screen share part of the circuit. Taking the reference electrode shared by the display screen and the touch circuit as an example, during the display stage, the reference electrode is used to provide a voltage signal to the pixel units included in the display screen so that the pixel units can emit light; during the touch stage, the reference electrode serves as the transmitting electrode or receiving electrode in the touch circuit to achieve touch sensing.

[0041] The clock signal generator 501 is used to output a first clock signal to the power generator 502 during the display phase and a second clock signal to the power generator 502 during the touch phase. Among them, the first clock signal is a signal with high and low level switching, and the second clock signal is a signal without high and low level switching; the power generator 502 is used to provide a first voltage signal to the display driver 503 based on the first clock signal and enter a high impedance state based on the second clock signal. When the power generator 502 enters the high impedance state, the power generator 502 can be regarded as an open element. The display driver 503 is used to drive the display screen to display an image based on the first voltage signal; the modulation pulse generator 504 is used to transmit a pulse signal to the touch sensor, and the pulse signal is used for the touch sensor to obtain a reference signal for determining the touch position.

[0042] In the touch and display driving circuit provided by the embodiment of the present application, the power generator 502 enters the high impedance state during the touch phase. Therefore, the power generator 502 is equivalent to an open element during the touch phase and will not generate switching noise. Thus, in the pulse signal transmitted by the modulation pulse generator 504, there will be no noise caused by switching noise, the noise in the pulse signal is less, and the quality is higher. Furthermore, the accuracy of the reference signal for determining the touch position obtained by the subsequent touch sensor based on the pulse signal is higher.

[0043] Since the first clock signal is a signal with high and low level switching, the first clock signal can also be called a pulse-type clock signal. Since the second clock signal is a signal without high and low level switching, the second clock signal can also be called a direct current (DC)-type clock signal, and the second clock signal can also be regarded as a DC-type clock signal obtained after disabling the pulse-type clock signal.

[0044] Exemplarily, the clock signal generator 501 is used to output a first clock signal or a second clock signal to the power generator 502 based on at least one of a touch enable signal or a display enable signal and a reference clock signal; among them, the reference clock signal is a signal with high and low level switching, the touch enable signal is a low-level signal during the display phase and a high-level signal during the touch phase, and the display enable signal is a high-level signal during the display phase and a low-level signal during the touch phase. During the display phase, both the first clock signal and the reference clock signal can be signals with high and low level switching, and the phase of the first clock signal can be the same as or opposite to the phase of the reference clock signal; during the touch phase, the pulses in the reference clock signal are eliminated to obtain the second clock signal belonging to the DC-type clock signal.

[0045] The clock signal generator can be implemented based on different gate-level components, so the implementation method of the clock signal generator is relatively flexible. Exemplarily, the clock signal generator is an AND gate or a NAND gate. For example, the clock signal generator is an AND gate, and the two input terminals of the AND gate respectively receive the inverted signal of the touch enable signal and the reference clock signal. In this case, the first clock signal output by the AND gate in the display stage is a pulsed clock signal, and the first clock signal is in the same phase as the reference clock signal; the second clock signal output by the AND gate in the touch stage is a DC clock signal, and the second clock signal is a low-level signal.

[0046] Again, for example, the clock signal generator is an AND gate, and the two input terminals of the AND gate respectively receive the display enable signal and the reference clock signal. In this case, the first clock signal output by the AND gate in the display stage is a pulsed clock signal, and the first clock signal is in the same phase as the reference clock signal; the second clock signal output by the AND gate in the touch stage is a DC clock signal, and the second clock signal is a low-level signal.

[0047] Again, for example, the clock signal generator is a NAND gate, and the two input terminals of the NAND gate respectively receive the inverted signal of the touch enable signal and the reference clock signal. In this case, the first clock signal output by the NAND gate in the display stage is a pulsed clock signal, and the first clock signal is in the opposite phase to the reference clock signal; the second clock signal output by the NAND gate in the touch stage is a DC clock signal, and the second clock signal is a high-level signal.

[0048] Again, for example, the clock signal generator is a NAND gate, and the two input terminals of the NAND gate respectively receive the display enable signal and the reference clock signal. In this case, the first clock signal output by the NAND gate in the display stage is a pulsed clock signal, and the first clock signal is in the opposite phase to the reference clock signal; the second clock signal output by the NAND gate in the touch stage is a DC clock signal, and the second clock signal is a high-level signal.

[0049] The power generator 502 can be a charge pump of a booster, and this charge pump can operate based on a clock signal with high and low level switching. The charge pump can charge and discharge the internal capacitor based on a clock signal with high and low level switching, so as to output a voltage signal based on the electric quantity stored in the capacitor. In the embodiments of the present application, since the first clock signal is a signal with high and low level switching, the first clock signal can be used as the switching signal of the charge pump. Since the second clock signal is a signal without high and low switching, the second clock signal cannot be used as the switching signal of the charge pump. When the second clock signal is input to the charge pump, the charge pump will enter a high-impedance state. In the case where the charge pump enters a high-impedance state, the output impedance of the charge pump is very high (usually in the order of megaohms or higher), and no voltage signal or current signal is output. The charge pump can be regarded as an open circuit state, that is, regarded as a disconnected component.

[0050] Exemplarily, the structure of the power generator 502 is as Figure 6 shown. The power generator includes a capacitor C2 and switches S1 to S4. The connection relationship of the capacitor C2 and the switches S1 to S4 is as Figure 6 shown. The switch S1 is linked with the switch S3, and the switch S2 is linked with the switch S4. That is, when the switch S1 is turned off, the switch S3 is also turned off; when the switch S1 is turned on, the switch S3 is also turned on. Similarly, when the switch S2 is turned off, the switch S4 is also turned off; when the switch S2 is turned on, the switch S4 is also turned on. The system reference can be ground. Both the first clock signal and the second clock signal serve as signals for controlling the switches S1 to S4. The embodiments of the present application do not limit the components for transmitting the reference voltage signal to the power generator 502 and the magnitude of the voltage value of the reference voltage signal.

[0051] Taking the power generator 502 receiving the first clock signal as an example, in the low-level stage of the first clock signal, the first clock signal controls the switches S1 and S3 to be turned on, and the switches S2 and S4 to be turned off, so that the capacitor C2 is charged. Moreover, since the switch S2 is turned off, the power generator 502 does not output a voltage signal, and the power generator 502 is said to enter a high-impedance state. In the high-level stage of the first clock signal, the first clock signal controls the switches S1 and S3 to be turned off, and the switches S2 and S4 to be turned on, so that the power generator 502 outputs a voltage signal, and the voltage value of the output voltage signal can be twice the voltage value of the reference voltage signal.

[0052] Taking the power generator 502 receiving the second clock signal as an example, regardless of whether the second clock signal is a high-level signal or a low-level signal, the second clock signal controls the switches S1 and S3 to be turned on, and the switches S2 and S4 to be turned off, so that the capacitor C2 is charged. Since the switch S2 is turned off, the power generator 502 does not output a voltage signal, and the power generator 502 is said to enter a high-impedance state.

[0053] The display driver 503 includes but is not limited to at least one of a gate driver or a source driver. Exemplarily, the touch sensor receives a signal from the receiving electrode of the touch circuit, and this signal is called an induction signal. The touch sensor demodulates the induction signal based on the pulse signal transmitted by the modulation pulse generator 504 to obtain a reference signal for determining the touch position. The modulation pulse generator 504 can also be connected to the touch driver, and the touch driver is also connected to the transmitting electrode of the touch circuit. The modulation pulse generator 504 transmits a pulse signal to the touch driver, and the touch driver transmits a driving signal to the transmitting electrode of the touch circuit based on the received pulse signal.

[0054] In some embodiments, the touch and display driving circuit further includes: a first switch and a capacitor; the first switch is respectively connected to the capacitor and the modulation pulse generator 504, and is configured to be turned on during the display phase to disconnect the connection between the capacitor and the modulation pulse generator 504, and to be closed during the touch phase to establish the connection between the capacitor and the modulation pulse generator 504; the modulation pulse generator 504 is further configured to transmit a pulse signal to the capacitor during the touch phase; the capacitor is also connected to the display driver 503, and is configured to provide a second voltage signal to the display driver 503 based on the pulse signal and the stored electric charge during the touch phase, so that the display driver 503 drives the display screen to display an image based on the second voltage signal. The position where the first switch is located may be the same as that of Figure 1 SW1 in Figure 1 . The position where the capacitor is located may be the same as the position of the capacitor C1 in Figure 1 . The voltage value of the second voltage signal may be equal to the sum of the voltage value of the pulse signal and the voltage value corresponding to the electric charge stored in the capacitor. For example, if the voltage value of the pulse signal in the low-level phase is V1, the voltage value in the high-level phase is V2, and the voltage value corresponding to the voltage stored in the capacitor is V3, then the voltage value of the second voltage signal in the low-level phase of the pulse signal is equal to V1 + V3, and the voltage value of the second voltage signal in the high-level phase of the pulse signal is equal to V2 + V3.

[0055] In the embodiments of the present application, the display driver 503 and the touch circuit may be disposed in the same area. In this case, the capacitance corresponding to the electrodes of the touch circuit will be affected by the signals transmitted to the display driver 503. When there is a lot of noise in the signals transmitted to the display driver 503, the capacitance corresponding to the electrodes of the touch circuit will change, thus resulting in inaccurate measurement of the touch position based on the change in capacitance. Therefore, when the noise of the pulse signal is small, the noise of the signals transmitted to the display driver 503 is also small, and further the accuracy of the measured touch position based on the change in capacitance is high. The capacitance corresponding to the electrodes of the touch circuit may refer to the self-capacitance between the receiving electrode and the system reference. In the solution for measuring the change in self-capacitance, this receiving electrode also serves as the transmitting electrode.

[0056] Furthermore, since the pulse signal can also be used as the driving signal transmitted to the transmitting electrode of the touch circuit, when the noise of the pulse signal is small, the difference between the driving signal and the induction signal caused by the noise is small, so that the accuracy of determining whether a touch occurs based on the difference between the driving signal and the induction signal is high.

[0057] In some embodiments, the circuit further includes: a second switch; the second switch is respectively connected to the capacitor and the system reference, and is configured to close during the display phase to connect the capacitor to the system reference, and open during the touch phase to disconnect the capacitor from the system reference; the capacitor is further connected to the power generator 502 and is configured to be charged based on the first voltage signal during the display phase. The system reference can be GND. By closing the second switch during the display phase, the power generator 502 can charge the capacitor. Thus, during the touch phase, the capacitor can provide the second voltage signal to the display driver 503 based on the stored charge and the received pulse signal. The position where the second switch is located can be the same as Figure 1 SW2 in

[0058] Figure 7 FIG. Figure 7 shows a schematic structural diagram of another touch and display driving circuit provided by an embodiment of the present application. As Figure 7 shown, the touch and display driving circuit includes: a clock signal generator 501, a power generator 502, a display driver 503, a modulation pulse generator 504, a touch sensor 505, a capacitor 506, a first switch 507, and a second switch 508. Among them, Figure 7 taking the clock signal generator 501 as an AND gate, and the AND gate receives the inverted signal touch_enb of the touch enable signal and the reference clock signal CLK as an example for illustration. As

[0059] shown, the clock signal generator 501 is connected to the power generator 502, and the power generator 502, the display driver 503, and the capacitor 506 are connected to each other in pairs. The capacitor 506 is further respectively connected to the first switch 507 and the second switch 508, the first switch 507 and the modulation pulse generator 504 are both connected to the touch sensor 505, and the second switch 508 is further connected to the system reference.

[0059] Referring to Figure 7 FIG., the reference clock signal CLK and the inverted signal touch_enb of the touch enable signal are input into the clock signal generator 501, and the clock signal generator 501 outputs the clock signal pump_clk to the power generator 502. Figure 8 FIG. Figure 8, the reference clock signal CLK is a pulsed clock signal, and the touch enable signal touch_en is a low-level signal during the display phase and a high-level signal during the touch phase. Therefore, the clock signal pump_clk is a pulsed clock signal during the display phase, and the clock signal pump_clk is referred to as the first clock signal during the display phase; the clock signal pump_clk is a DC clock signal during the touch phase, and the clock signal pump_clk is referred to as the second clock signal during the touch phase. The waveforms of the touch enable signal touch_en, the reference clock signal CLK, and the clock signal pump_clk during the display phase and the touch phase are as Figure 8 shown. Figure 8 The waveform of the display enable signal display_en is also shown. The display enable signal display_en is a high-level signal during the display phase and a low-level signal during the touch phase.

[0060] During the display phase, the power generator 502 receives the first clock signal, generates a first voltage signal VG0 based on the first clock signal, and the power generator 502 provides the first voltage signal VG0 to the display driver 503. The first switch 507 is opened to disconnect the capacitor 506 from the modulation pulse generator 504. Therefore, the voltage signal VG received by the display driver 503 is the same as the first voltage signal VG0. Furthermore, during the display phase, the second switch 508 is closed to connect the capacitor 506 to the system reference, and the power generator 502 charges the capacitor 506. Since the first clock signal is a pulsed clock signal, switching noise will be generated during the process of the power generator 502 generating the first voltage signal based on the first clock signal. The waveform of the voltage signal VG received by the display driver 503 during the display phase and the waveform of the switching noise generated by the power generator 502 during the display phase are as Figure 8 shown. The waveform description of VG and the switching noise during the display phase can be found in Figure 4 the relevant description, which will not be elaborated here.

[0061] The modulation pulse generator 504 can also generate a pulse signal Vmod during the display phase, and the touch sensor 505 can also receive a pulse signal Vmod1 during the display phase. Among them, the pulse signal Vmod1 is the pulse signal Vmod after being transmitted through the metal wiring. The waveforms of the pulse signal Vmod and the pulse signal Vmod1 during the display phase are as Figure 8 shown. The waveform description of Vmod and Vmod1 during the display phase can be found in Figure 4 the relevant description, which will not be elaborated here. Since the first switch 507 is open during the display phase, the pulse signal Vmod1 will not be transmitted to the capacitor 506 and will not be affected by the switching noise generated by the power generator 502.

[0062] During the touch stage, the power generator 502 receives the second clock signal. Since the second clock signal is a DC-type clock signal, the power generator 502 will operate in a non-switching manner, and thus the power generator 502 will be in a high impedance (Hi-Z) state. When the power generator 502 is in the high impedance state, the power generator 502 is equivalent to an open element, so the power generator 502 will not generate switching noise. Furthermore, during the touch stage, the first switch 507 is closed to connect the capacitor 506 to the modulation pulse generator 504, and the second switch 508 is opened to disconnect the capacitor 506 from the system reference. Also, since the first switch 507 is closed, the pulse signal Vmod1 is also transmitted to the capacitor 506, and the capacitor 506 provides a second voltage signal to the display driver 503 based on the received pulse signal and the stored charge. The waveform of the voltage signal VG received during the touch stage and the waveform of the switching noise generated by the power generator 502 during the touch stage are as Figure 8 shown. For the waveform description of VG during the touch stage, refer to the relevant description in Figure 4 , which will not be elaborated here. Since the power generator 502 enters the high impedance state during the touch stage, the power generator 502 does not generate switching noise during the touch stage. In Figure 8 , the switching noise during the touch stage is represented by a signal without jumps.

[0063] Since the power generator 502 does not generate switching noise during the touch stage, the pulse signal Vmod1 received by the touch sensor 505 during the touch stage can be the same as the pulse signal Vmod generated by the modulation pulse generator 504, and the pulse signal Vmod1 will not be affected by the switching noise. The waveforms of the pulse signal Vmod and the pulse signal Vmod1 during the touch stage are as Figure 8 shown. Based on Figure 7 and Figure 8 , it can be seen that during the display stage, the display driver 503 is driven by the first voltage signal transmitted by the power generator 502, and during the touch stage, the display driver 503 is driven by the second voltage signal transmitted by the capacitor 506.

[0064] Figure 9 is a flowchart of a touch and display driving method provided by an embodiment of the present application. This method can be applied to the touch and display driving circuit shown in Figure 5 or Figure 7 , as shown in Figure 9 . This method includes but is not limited to steps 901 to 902.

[0065] Step 901, in the display stage, the clock signal generator outputs a first clock signal to the power generator, the power generator provides a first voltage signal to the display driver based on the first clock signal, and the display driver drives the display screen to display an image based on the first voltage signal, where the first clock signal is a signal with high and low level switching.

[0066] Step 902, in the touch stage, the clock signal generator outputs a second clock signal to the power generator, so that the power generator enters a high impedance state based on the second clock signal, and the modulation pulse generator transmits a pulse signal to the touch sensor, where the second clock signal is a signal without high and low level switching, and the pulse signal is used for the touch sensor to obtain a reference signal for determining the touch position.

[0067] Exemplarily, in the display stage, the clock signal generator outputs a first clock signal to the power generator and in the touch stage, the clock signal generator outputs a second clock signal to the power generator, including: the clock signal generator outputs a first clock signal or a second clock signal to the power generator based on at least one of a touch enable signal or a display enable signal and a reference clock signal; where the reference clock signal is a signal with high and low level transitions, the touch enable signal is a low level signal in the display stage and a high level signal in the touch stage, and the display enable signal is a high level signal in the display stage and a low level signal in the touch stage.

[0068] Exemplarily, the clock signal generator is an AND gate or a NAND gate.

[0069] Regarding the manner in which the display driver drives the display screen to display an image, please refer to the content in the related art, and the embodiments of the present application will not be elaborated further. After obtaining the reference signal for determining the touch position, the touch sensor can determine the touch position based on the reference signal. Alternatively, the touch sensor can store the reference signal in a memory, and the processor reads the reference signal from the memory and determines the touch position based on the reference signal. The memory and the processor can be located inside or outside the touch and display driver circuit, and the embodiments of the present application do not limit this. The signal transmitted by the touch circuit to the touch sensor can be called an induction signal. Regarding the manner in which the touch sensor obtains the reference signal for determining the touch position based on the pulse signal and the induction signal, please refer to the content in the related art, and the embodiments of the present application will not be elaborated further.

[0070] In some embodiments, the method further includes: in the display phase, disconnecting the connection between the capacitor and the modulation pulse generator by turning on the first switch; in the touch phase, connecting the capacitor and the modulation pulse generator by closing the first switch, providing a pulse signal to the capacitor through the modulation pulse generator, and providing a second voltage signal to the display driver based on the pulse signal and the stored electric charge by the capacitor, so that the display driver drives the display screen to display an image based on the second voltage signal.

[0071] In some embodiments, the method further includes: in the display phase, closing the second switch to connect the capacitor and the system reference, and in the touch phase, opening the second switch to disconnect the connection between the capacitor and the system reference; charging the capacitor based on the first voltage signal in the display phase. The system reference can be GND.

[0072] In the touch and display driving method provided in the embodiments of the present application, the power generator enters a high-impedance state in the touch phase. Thus, the power generator is equivalent to a disconnected component in the touch phase and does not generate switching noise. Therefore, there is no noise caused by switching noise in the pulse signal transmitted by the modulation pulse generator to the touch sensor. The noise in the pulse signal is less and the quality is higher. Furthermore, the accuracy of the reference signal for determining the touch position obtained by the subsequent touch sensor based on the pulse signal is higher.

[0073] The method provided in the above embodiments belongs to the same concept as the device embodiments in the previous text. The specific implementation manners and the corresponding technical effects can refer to the device embodiments and will not be elaborated here.

[0074] In an exemplary embodiment, a touch and display driving chip is further provided. The chip includes any one of the above touch and display driving circuits. Figure 10 is a schematic structural diagram of a touch and display driving chip provided in the embodiments of the present application. As Figure 10 shown, the touch and display driving chip includes a touch and display driving circuit. The touch and display driving chip may further include other circuits, which are not limited in the embodiments of the present application.

[0075] In an exemplary embodiment, an electronic device is further provided. The electronic device may include the above touch and display driving chip. The electronic device may vary greatly due to different configurations or performances. For example, the electronic device may further include one or more processors, and the processor may be a central processing unit (CPU). The electronic device may also have components such as a memory, a wired or wireless network interface, a keyboard, and an input / output interface for storage and input / output. The electronic device may further include other components for implementing the functions of the device, which will not be elaborated here.

[0076] Figure 11 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. As Figure 11 shown, the electronic device includes a touch and display driver chip and a touch screen. This touch screen includes a display screen and a touch circuit. The touch and display driver chip is used to drive the touch screen to display an image, and is also used to receive the induction signal transmitted by the touch screen to obtain a signal for determining the touch position.

[0077] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.), and signals involved in the present application are all authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions.

[0078] It should be understood that the "plurality" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0079] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0080] The implementation manners described in the above exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0081] The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present application shall be included in the protection scope of the present application.

Claims

1. A touch control and display driving circuit, characterized in that: The circuit comprises: a clock signal generator, a power generator, a display driver and a modulation pulse generator; The clock signal generator is connected to the power generator, and is used to output a first clock signal to the power generator in the display stage, and output a second clock signal to the power generator in the touch stage, wherein the first clock signal is a signal with high-low level switching, and the second clock signal is a signal without high-low level switching; The power generator is also connected to the display driver, and is used to transmit a first voltage signal to the display driver based on the first clock signal, and enter a high impedance state based on the second clock signal; The display driver is used to drive the display screen to display an image based on the first voltage signal; The modulation pulse generator is used to transmit a pulse signal to the touch sensor during the touch phase, and the pulse signal is used by the touch sensor to obtain a reference signal for determining a touch position.

2. The circuit according to claim 1, characterized in that The clock signal generator is used to output the first clock signal or the second clock signal to the power generator based on at least one of the touch enable signal or the display enable signal and a reference clock signal; wherein the reference clock signal is a signal with high-low level switching, the touch enable signal is a low-level signal in the display stage and a high-level signal in the touch stage, and the display enable signal is a high-level signal in the display stage and a low-level signal in the touch stage.

3. The circuit according to claim 2, characterized in that The clock signal generator is an AND gate or a NAND gate.

4. The circuit according to any one of claims 1 to 3, characterized in that: The circuit further includes: a first switch and a capacitor; The first switch is connected to the capacitor and the modulation pulse generator, respectively, and is used to be opened in the display stage to disconnect the capacitor from the modulation pulse generator, and closed in the touch stage to connect the capacitor to the modulation pulse generator; The modulation pulse generator is further used to transmit the pulse signal to the capacitor during the touch phase; The capacitor is also connected to the display driver and is used to provide a second voltage signal to the display driver based on the pulse signal and the stored electricity during the touch phase, so that the display driver drives the display screen to display an image based on the second voltage signal.

5. The circuit according to claim 4, characterized in that The circuit further includes: a second switch; The second switch is connected to the capacitor and the system reference, respectively, and is used to be closed in the display phase to achieve the connection between the capacitor and the system reference, and opened in the touch phase to disconnect the connection between the capacitor and the system reference; The capacitor is also connected to the power generator and is used to charge based on the first voltage signal during the display stage.

6. A touch control and display driving method, characterized in that: The method comprises: In the display stage, a first clock signal is output to a power generator through a clock signal generator, a first voltage signal is provided to a display driver based on the first clock signal through the power generator, and a display screen is driven to display an image based on the first voltage signal through the display driver, wherein the first clock signal is a signal with high and low level switching; In the touch stage, the clock signal generator outputs a second clock signal to the power generator, so that the power generator enters a high impedance state based on the second clock signal, and transmits a pulse signal to the touch sensor through the modulation pulse generator, wherein the second clock signal is a signal without high or low level switching, and the pulse signal is used by the touch sensor to obtain a reference signal for determining the touch position.

7. The method according to claim 6, characterized in that The step of outputting a first clock signal to a power generator through a clock signal generator in a display stage and outputting a second clock signal to the power generator through the clock signal generator in a touch stage comprises: The first clock signal or the second clock signal is output to the power generator through the clock signal generator based on at least one of the touch enable signal or the display enable signal and a reference clock signal; wherein the reference clock signal is a signal with high-low level transitions, the touch enable signal is a low-level signal in the display stage and a high-level signal in the touch stage, and the display enable signal is a high-level signal in the display stage and a low-level signal in the touch stage.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: In the display stage, the first switch is opened to disconnect the capacitor from the modulation pulse generator; In the touch stage, the first switch is closed to achieve connectivity between the capacitor and the modulation pulse generator, a pulse signal is provided to the capacitor through the modulation pulse generator, and a second voltage signal is provided to the display driver based on the pulse signal and the stored electricity through the capacitor, so that the display driver drives the display screen to display an image based on the second voltage signal.

9. A touch and display driver chip, characterized in that: The chip comprises the touch control and display driving circuit as claimed in any one of claims 1 to 5.

10. An electronic device, characterized in that: The electronic device comprises the chip according to claim 9.

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