Touch display chip, display chip, touch chip, touch display system, display screen and electronic device

Abstract

The application provides a touch display chip, a display chip, a touch chip, a touch display system, a display screen and an electronic device. The touch display chip comprises a touch sub-chip, a display sub-chip and a noise simulation unit. The noise simulation unit is electrically connected to the touch sub-chip and the display sub-chip. The display sub-chip can send a display signal to a plurality of display pixels, make the display pixels emit light, and send a reference signal to the noise simulation unit. The noise simulation unit can generate a simulated interference signal according to the reference signal. The simulated interference signal is used to simulate an interference signal generated by the display signal coupling to a cathode plate. The touch sub-chip can output a driving signal to an electrode and perform touch detection according to an induced signal generated by the electrode and the simulated interference signal. The touch display chip provided by the application can offset the signal interference of the display signal on the touch detection when the touch detection is performed, and improve the sensitivity of the touch detection.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of touch chips, and in particular to a touch display chip, a display chip, a touch chip, a touch display system, a display screen, and an electronic device. Background Art

[0002] Touch technology is a form of human-computer interaction. Users interact with electronic devices by touching or performing gestures on the touch area of ​​the electronic device. With the development of smart devices, touch technology has become the mainstream operation method of electronic devices such as mobile phones. Mobile phones and other electronic devices receive touch commands entered by users on the display screen and identify corresponding touch operations based on the touch commands.

[0003] At present, the display screen in electronic devices includes a display pixel layer and an electrode layer. The display pixel layer and the electrode layer are respectively arranged on both sides of the cathode plate of the display screen. The touch chip of the electronic device performs touch detection based on the sensing signal generated by the electrode, and the display chip sends a display signal to the display pixel to drive the display pixel to display an image.

[0004] However, when the display chip sends a display signal to the display pixel to drive the display pixel to display an image, the display signal will be coupled to the cathode plate to form an interference signal. The interference signal on the cathode plate is coupled to the electrode, causing signal interference to the touch detection, resulting in low sensitivity of the touch detection. Summary of the Invention

[0005] In view of this, embodiments of the present application provide a touch display chip, a display chip, a touch chip, a touch display system, a display screen, and an electronic device to at least partially solve the above-mentioned problems.

[0006] According to a first aspect of an embodiment of the present application, a touch display chip is provided, which is applied to an electronic device, including: a touch sub-chip, a display sub-chip and a noise simulation unit; the display sub-chip is electrically connected to multiple display pixels in the electronic device, the touch sub-chip is electrically connected to multiple electrodes in the electronic device, and the noise simulation unit is electrically connected to the touch sub-chip and the display sub-chip, respectively; the display sub-chip is used to send display signals to the multiple display pixels to make the display pixels emit light, and to send a reference signal to the noise simulation unit; the noise simulation unit is used to generate an analog interference signal based on the reference signal, and the analog interference signal is used to simulate the interference signal generated by the display signal on touch detection after being coupled to the cathode plate in the electronic device; the touch sub-chip is used to output a drive signal to the electrodes, and perform touch detection based on the sensing signal generated by the electrodes and the analog interference signal.

[0007] In a possible implementation, the electrodes include a plurality of transverse electrodes and / or a plurality of longitudinal electrodes, the touch control chip outputs the driving signal to one of the plurality of transverse electrodes and the plurality of longitudinal electrodes, and receives the sensing signal output by the other of the plurality of transverse electrodes and the plurality of longitudinal electrodes, or at least one of the plurality of transverse electrodes and the plurality of longitudinal electrodes functions as both a driving electrode and a receiving electrode, the touch control chip sends the driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode.

[0008] In a possible implementation, the display sub-chip includes an acquisition unit, a calculation unit, a plurality of first driving units, and a second driving unit; the acquisition unit is configured to acquire display data; the first driving units are configured to send the display signal to display pixels corresponding to the first driving units according to the display data; the calculation unit is configured to calculate reference data according to the display data; and the second driving unit is configured to send the reference signal to the noise simulation unit according to the reference data.

[0009] In a possible implementation, the reference data is in a linear relationship with an average value of the display data.

[0010] In a possible implementation, the noise simulation unit includes a first resistor, a second resistor, a first capacitor, and a second capacitor; the display sub-chip further includes a third resistor; a first end of the first resistor is connected to an output end of the second driving unit, a second end of the first resistor is connected to a first end of the first capacitor, a second end of the first capacitor is respectively connected to a first end of the third resistor and a first end of the second capacitor, a second end of the third resistor is configured to receive a cathode plate voltage of the cathode plate or the second end of the third resistor is grounded, a second end of the second capacitor is electrically connected to the touch control sub-chip, a first end of the second resistor is connected to the second end of the second capacitor, and a second end of the second resistor receives the common-mode voltage.

[0011] In a possible implementation, the touch control sub-chip includes a processing unit and a plurality of identification units; the plurality of identification units are respectively electrically connected to the plurality of electrodes, and different identification units are electrically connected to different electrodes; the identification units are configured to receive the analog interference signal and the sensing signal generated by the connected electrodes, and generate an identification signal according to the sensing signal and the analog interference signal; and the processing unit is configured to perform touch detection according to the identification signals generated by at least part of the identification units in the plurality of identification units.

[0012] In one possible implementation, the identification unit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor and an operational amplifier; the first end of the fourth resistor is connected to the electrode, the second end of the fourth resistor is connected to the negative input terminal of the operational amplifier, the first end of the third capacitor is connected to the negative input terminal of the operational amplifier, the second end of the third capacitor is connected to the output terminal of the operational amplifier, the first end of the fifth resistor is connected to the first end of the third capacitor, the second end of the fifth resistor is connected to the second end of the third capacitor, the first end of the sixth resistor is electrically connected to the output terminal of the noise simulation unit, the second end of the sixth resistor is respectively connected to the first end of the seventh resistor and the positive input terminal of the operational amplifier, and the second end of the seventh resistor receives the common mode voltage of the drive signal.

[0013] In one possible implementation, the identification unit also includes: a first amplifying unit; the input end of the first amplifying unit is respectively connected to the second end of the second capacitor and the first end of the second resistor, and the output end of the first amplifying unit is connected to the first end of the sixth resistor; the first amplifying unit is used to receive the analog interference signal and amplify the analog interference signal, so that the identification unit performs touch detection based on the sensing signal and the amplified analog interference signal.

[0014] In a possible implementation, at least one of the amplification factor of the first amplifying unit in the identification unit, the resistance value of the sixth resistor, and the resistance value of the seventh resistor corresponding to at least some adjacent electrodes is different.

[0015] In one possible implementation, the noise simulation unit also includes: a second amplifying unit; the input end of the second amplifying unit is respectively connected to the second end of the second capacitor and the first end of the second resistor, and the output end of the second amplifying unit is respectively connected to the first end of the sixth resistor in each of the identification units; the second amplifying unit is used to amplify the signal passing through the second capacitor to obtain the simulated interference signal.

[0016] In a possible implementation, at least one of the resistance value of the sixth resistor and the resistance value of the seventh resistor in the identification unit corresponding to at least some adjacent electrodes is different.

[0017] In one possible implementation, the touch sub-chip is configured to perform touch detection based on the sensing signal and the analog interference signal when the display sub-chip outputs the reference signal, and to perform touch detection based on the sensing signal when the display sub-chip stops outputting the reference signal.

[0018] In one possible implementation, the identification unit also includes: a first switch and a second switch; the second end of the first switch is electrically connected to the positive input terminal of the operational amplifier, the first end of the first switch is used to receive the common-mode voltage, and the first end of the second switch is respectively connected to the second end of the sixth resistor and the first end of the seventh resistor; when the display sub-chip outputs the reference signal, the first switch is disconnected and the second switch is closed; when the display sub-chip stops outputting the reference signal, the first switch is closed and the second switch is disconnected.

[0019] According to a second aspect of an embodiment of the present application, a display chip is provided, wherein the display chip is configured to send a display signal to a plurality of display pixels to cause the display pixels to emit light, and to send a reference signal to a noise simulation unit to cause the noise simulation unit to generate an analog interference signal based on the reference signal, so that a touch chip performs touch detection based on the sensing signal generated by the electrode and the analog interference signal, wherein the analog interference signal is used to simulate the interference signal generated by the touch detection after the display signal is coupled to the cathode plate in the electronic device.

[0020] According to a third aspect of an embodiment of the present application, a touch chip is provided, which is used to output a driving signal to an electrode and perform touch detection based on an induction signal and an analog interference signal generated by the electrode, wherein the analog interference signal is used to simulate the interference signal generated by the touch detection after the display signal is coupled to the cathode plate in the electronic device, and the analog interference signal is generated by a noise simulation unit based on a reference signal, and the display signal and the reference signal are output by the display chip.

[0021] According to a fourth aspect of the embodiments of the present application, a touch display system is provided, comprising a noise simulation unit, the display chip as described in the second aspect, and the touch chip as described in the third aspect.

[0022] According to a fifth aspect of an embodiment of the present application, a display screen is provided, comprising a plurality of electrodes, a plurality of display pixels, and the touch display chip as described in the first aspect or the touch display system as described in the fourth aspect.

[0023] According to a sixth aspect of an embodiment of the present application, an electronic device is provided, comprising the display screen as described in the fifth aspect.

[0024] According to the touch display chip provided in the embodiment of the present application, the touch display chip includes a touch sub-chip, a display sub-chip and a noise simulation unit. The display sub-chip can send a reference signal to the noise simulation unit while sending a display signal to multiple display pixels. The noise simulation unit can generate an analog interference signal based on the reference signal. The touch sub-chip can send a driving signal to the electrode and perform touch detection based on the sensing signal generated by the electrode and the analog interference signal generated by the noise simulation unit when the finger touches. Since the analog interference signal can simulate the interference signal generated by the display signal after being coupled to the cathode plate in the electronic device for touch detection, when the touch sub-chip performs touch detection based on the sensing signal and the analog interference signal, the analog interference signal can offset the signal interference of the display signal on the touch detection, thereby reducing the interference of external signals during touch detection and improving the sensitivity of touch detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic diagram of a display screen stack provided in an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of a touch display chip provided in an embodiment of the present application;

[0028] Figure 3 is a schematic diagram of a display sub-chip provided in an embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of the principle of signal interference provided by an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of a noise simulation unit provided in an embodiment of the present application;

[0031] Figure 6 is a schematic diagram of a touch sub-chip provided in an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of an identification unit provided in an embodiment of the present application;

[0033] Figure 8 is a schematic diagram of an identification unit including an amplification unit provided in an embodiment of the present application;

[0034] Figure 9is a schematic diagram of a noise simulation unit including an amplification unit provided in an embodiment of the present application;

[0035] Figure 10 is a schematic diagram of an identification unit including a switch provided in an embodiment of the present application;

[0036] Figure 11 Schematic diagram of a touch display system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0038] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0039] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0040] As mentioned above, touch technology is a human-computer interaction method. Users interact with electronic devices by touching or performing gestures on the touch area of ​​the electronic device. With the development of smart devices, touch technology has become the mainstream operation method of electronic devices such as mobile phones. Mobile phones and other electronic devices receive touch commands input by users on the display screen and identify the corresponding touch operations based on the touch commands. At present, the display screen in an electronic device includes a display pixel layer and an electrode layer. The display pixel layer and the electrode layer are respectively arranged on both sides of the cathode plate of the display screen. In one example, Figure 1 is a schematic diagram of a display screen stack provided by an embodiment of the present application, such as Figure 1As shown, the display screen is stacked from top to bottom as a flexible cover 101, a polarizer 102, a touch electrode layer 103, an organic encapsulation layer 104, a metal cathode 105, an organic light-emitting semiconductor (Organic Electroluminescence Display, OLED) layer 106, a thin film transistor (Thin Film Transistor, TFT) layer 107, and a silicon substrate 108. The metal cathode 105 is the cathode plate, and the OLED layer 106 is the display pixel layer. The touch chip of the electronic device performs touch detection based on the sensing signal generated by the electrode, and the display chip sends a display signal to the display pixel to drive the display pixel to display an image. However, when the display chip sends a display signal to the display pixel to drive the display pixel to display an image, the display signal will be coupled to the cathode plate to form an interference signal. The interference signal on the cathode plate is coupled to the electrode, causing signal interference to the touch detection. Specifically, the cathode plate is Mg-Ag alloy (magnesium-silver alloy), which can be equivalent to many distributed resistors in series and parallel. The display chip transmits the drive signal through the drive line to drive the display pixel to emit light. When the display line transmits the display signal, part of the display signal is coupled to the cathode plate to form an interference signal. The interference signal on the cathode plate is coupled to the electrode in the electrode layer, resulting in low sensitivity of touch detection.

[0041] The present application provides a touch display chip, which includes a touch sub-chip, a display sub-chip and a noise simulation unit. The display sub-chip can send a reference signal to the noise simulation unit while sending a display signal to multiple display pixels. The noise simulation unit can generate an analog interference signal based on the reference signal. The touch sub-chip can send a drive signal to the electrode and perform touch detection based on the sensing signal generated by the electrode and the analog interference signal generated by the noise simulation unit when a finger touches. Since the analog interference signal can simulate the interference signal generated by the display signal after being coupled to the cathode plate in the electronic device to the touch detection, when the touch sub-chip performs touch detection based on the sensing signal and the analog interference signal, the analog interference signal can offset the signal interference of the display signal on the touch detection, thereby reducing the interference of external signals during touch detection and improving the sensitivity of touch detection.

[0042] Figure 2 Schematic diagram of a touch display chip provided in an embodiment of the present application. The touch display chip 200 is applied to electronic devices, such as Figure 2 As shown, the touch display chip 200 includes a touch sub-chip 201, a display sub-chip 203 and a noise simulation unit 202. The display sub-chip 203 is electrically connected to multiple display pixels 402 in the electronic device, the touch sub-chip 201 is electrically connected to multiple electrodes 401 in the electronic device, and the noise simulation unit 202 is electrically connected to the touch sub-chip 201 and the display sub-chip 203 respectively.

[0043] The display sub-chip 203 can send display signals to multiple display pixels 402 to make the display pixels 402 emit light, and send a reference signal to the noise simulation unit 202. The noise simulation unit 202 can generate an analog interference signal based on the reference signal. The analog interference signal is used to simulate the interference signal generated by the display signal coupled to the cathode plate in the electronic device for touch detection. The touch sub-chip 201 can output a driving signal to the electrode 401 and perform touch detection based on the sensing signal and the analog interference signal generated by the electrode 401.

[0044] The display sub-chip 203 is electrically connected to a plurality of display pixels 402 in the electronic device via a driving circuit. The display sub-chip 203 can send display signals to the plurality of display pixels 402. The display signals can drive at least some of the plurality of display pixels 402 to emit light. For example, the display sub-chip 203 can control the R pixels, G pixels, and B pixels in the plurality of display pixels 402 to emit light, so that the display screen of the electronic device displays a corresponding image. It should be understood that the display pixels 402 are generally arranged in rows and columns, and the display sub-chip 203 drives the display pixels row by row, so that the display pixels 402 are refreshed row by row. When the display sub-chip 203 drives the display pixels 402, it simultaneously sends display signals to a row of display pixels 402. Since a row includes multiple display pixels 402, when the display sub-chip 203 sends display signals to a row of display pixels 402, the driving circuits between the plurality of display pixels 402 and the display sub-chip 203 can couple the transmitted display signals to the cathode plate, generating interference signals. The interference signals can then couple to the electrodes 401 on the other side of the cathode plate, affecting touch detection.

[0045] The display sub-chip 203 can send a reference signal to the noise simulation unit 202 while sending the display signal. The reference signal is related to the display signal corresponding to each display pixel output by the display sub-chip. In one example, the reference signal and the display signal are positively correlated. The stronger the signal strength of the display signal, the stronger the signal strength of the reference signal. After receiving the reference signal, the noise simulation unit 202 generates a simulated interference signal based on the reference signal. The simulated interference signal can simulate the signal interference caused by the display signal to the touch detection.

[0046] The touch sub-chip 201 can output a driving signal to the electrode 401. In one example, the driving signal can be a square wave waveform signal, a sine wave waveform signal, a trapezoidal wave waveform signal, etc. The electrode 401 receives the driving signal. When the finger touches, the electrode 401 detects the touch position of the finger through self-capacitance or mutual capacitance to generate a sensing signal. The touch sub-chip 201 can perform touch recognition based on the sensing signal and the simulated interference signal sent by the noise simulation unit 202. Specifically, the touch sub-chip 201 can offset the signal interference in the sensing signal due to the display signal coupled to the electrode 401 through the simulated interference signal when performing touch detection based on the sensing signal.

[0047] In an embodiment of the present application, the touch display chip 200 includes a touch sub-chip 201, a display sub-chip 203 and a noise simulation unit 202. The display sub-chip 203 can send a reference signal to the noise simulation unit 202 while sending a display signal to multiple display pixels 402. The noise simulation unit 202 can generate an analog interference signal based on the reference signal. The touch sub-chip 201 can send a driving signal to the electrode 401 and perform touch detection based on the sensing signal generated by the electrode 401 and the analog interference signal generated by the noise simulation unit 202 when a finger touches the touch. Since the analog interference signal can simulate the interference signal generated by the display signal after being coupled to the cathode plate in the electronic device to the touch detection, when the touch sub-chip 201 performs touch detection based on the sensing signal and the analog interference signal, the analog interference signal can offset the signal interference of the display signal on the touch detection, thereby reducing the interference of external signals during touch detection and improving the sensitivity of touch detection.

[0048] In one possible implementation, the electrode 401 includes multiple horizontal electrodes and / or multiple vertical electrodes, and the touch control sub-chip 201 outputs a driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and receives a sensing signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes; alternatively, at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode, and the touch control sub-chip 201 sends a driving signal to the driving electrode and receives a sensing signal output by the receiving electrode.

[0049] One of the multiple horizontal electrodes and the multiple vertical electrodes serves as a driving electrode, and the touch sub-chip 201 outputs a driving signal to the driving electrode. The other of the multiple horizontal electrodes and the multiple vertical electrodes serves as a receiving electrode and outputs a sensing signal. The touch sub-chip 201 performs touch detection based on the sensing signal and the analog interference signal, and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0050] In addition, in another possible implementation, a self-capacitive detection method can be superimposed to detect the touch position of the finger. At least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode. The touch sub-chip 201 sends a driving signal to the driving electrode and performs touch detection based on the sensing signal output by the receiving electrode. For example, the touch sub-chip 201 outputs a driving signal to the multiple horizontal electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple horizontal electrodes (receiving electrodes); or the touch sub-chip 201 outputs a driving signal to the multiple vertical electrodes (driving electrodes) and simultaneously receives the sensing signals output by the multiple vertical electrodes (receiving electrodes); or the touch sub-chip 201 simultaneously outputs a driving signal to the multiple horizontal electrodes and the multiple vertical electrodes and simultaneously receives the sensing signals output by the multiple horizontal electrodes and the multiple vertical electrodes. The touch sub-chip 201 performs touch detection based on the received sensing signals and the analog interference signal.

[0051] In one example, when the touch sub-chip 201 performs touch detection based on the sensing signal and the analog interference signal, it can first detect the sensing signal generated by the horizontal electrode to obtain the Y-axis coordinate of the touch position, and then detect the sensing signal generated by the vertical electrode to obtain the X-axis coordinate of the touch position, or it can first detect the X-axis coordinate and then detect the Y-axis coordinate. In another example, the touch sub-chip 201 can simultaneously detect the sensing signals generated by the horizontal electrodes and the vertical electrodes to directly obtain the X-axis coordinate and Y-axis coordinate of the touch position. In another example, the touch sub-chip 201 can only detect the sensing signals generated by the horizontal electrodes or the vertical electrodes, that is, only detect the X-axis coordinate or Y-axis coordinate of the touch position, which can be suitable for scenarios with lower detection accuracy requirements. The specific detection method can be set as needed and is not limited here.

[0052] In an embodiment of the present application, the touch sub-chip 201 can output a driving signal to the electrode 401. When a finger touches, the electrode 401 can generate a sensing signal by self-capacitance or mutual capacitance. The touch sub-chip 201 can perform touch detection based on the sensing signal and the analog interference signal, thereby realizing touch detection by self-capacitance or mutual capacitance of the electrode 401. Touch detection by mutual capacitance of the electrode 401 can realize high-precision multi-touch and improve the anti-interference ability of touch detection. Touch detection by self-capacitance of the electrode 401 can reduce costs and improve the signal strength of the sensing signal. Therefore, touch detection by self-capacitance or mutual capacitance of the electrode 401 can be set according to the usage scenario, and the applicability is high.

[0053] Figure 3 is a schematic diagram of a display sub-chip provided in an embodiment of the present application, such as Figure 3As shown, the display sub-chip 203 includes: an acquisition unit 2031, a calculation unit 2032, multiple first drive units 2033 and a second drive unit 2034. The acquisition unit 2031 can acquire display data, the first drive unit 2033 can send a display signal to the display pixel 402 corresponding to the first drive unit 2033 according to the display data, the calculation unit 2032 can calculate reference data according to the display data, and the second drive unit 2034 can send a reference signal to the noise simulation unit 202 according to the reference data.

[0054] The acquisition unit 2031 in the display sub-chip 203 can acquire display data. Optionally, the acquisition unit can process the display sub-data sent by the processor in the electronic device to obtain the display data. For example, the display data can be obtained after performing signal processing and compensation on the display sub-data. In one example, the processor in the electronic device can be a unit with processing functions such as a central processing unit (CPU), a graphics processing unit (GPU), or an application specific integrated circuit (ASIC). After acquiring the display data, the acquisition unit 2031 sends display signals to the multiple display pixels 402 through multiple first driving units 2033 based on the display data. In one example, the first driving unit 2033 can be a digital-to-analog converter (DAC). The DAC can convert the display data (digital signal) received by the acquisition unit 2031 into a display signal (analog signal), and drive the display pixel 402 corresponding to the first driving unit 2033 through the display signal.

[0055] After the acquisition unit 2031 in the display sub-chip 203 acquires the display data, the calculation unit 2032 can calculate the signal amount of signal interference caused by the display signal transmitted in the driving circuit to the touch detection based on the display data, that is, calculate the reference data based on the display data, and the second driving unit 2034 can output a reference signal based on the reference data. In one example, the second driving unit 2034 can be a DAC, which can convert the reference data (digital signal) calculated by the calculation unit 2032 into a reference signal (analog signal) through the DAC and send the reference signal to the noise simulation unit 202.

[0056] In the embodiment of the present application, the display sub-chip 203 includes an acquisition unit 2031, a calculation unit 2032, a plurality of first drive units 2033, and a second drive unit 2034. The acquisition unit 2031 can acquire display data, and the first drive unit 2033 can send a display signal to the display pixel 402 corresponding to the first drive unit 2033 based on the display data. In this way, the plurality of first drive units 2033 can drive the plurality of display pixels 402 to emit light based on the display data. The calculation unit 2032 can calculate reference data based on the display data, and the second drive unit 2034 can send a reference signal to the noise simulation unit 202 based on the reference data to output the reference signal. Since the reference signal is generated based on the display data, the simulated interference signal generated by the noise simulation unit 202 based on the reference signal can simulate the signal interference caused by the display signal on touch detection. Therefore, during touch detection, the simulated interference signal can offset the signal interference caused by the display signal on touch detection, thereby improving the touch detection sensitivity.

[0057] In a possible implementation manner, the reference data is in a linear relationship with an average value of the display data.

[0058] The specific principle is explained below. Figure 4 This is a schematic diagram of a principle of signal interference provided by an embodiment of the present application, such as Figure 4 As shown in FIG. 1 , when S display pixels 402 are driven simultaneously, the S display pixels 402 all generate signal interference on the cathode plate. When the display sub-chip 203 sends a driving signal to only one display pixel 402 among the S display pixels 402, the noise coupled from the driving circuit of the display pixel 402 to the cathode plate is: , It is used to characterize the signal interference generated by the first display pixel 402. Used to characterize the cathode plate resistance, The resistance of the driving circuit used to characterize the display pixel 402, Used to characterize the equivalent capacitance between the driving circuit and the cathode plate of the display pixel 402 The impedance, A display signal transmitted in the driving circuit for representing the first display pixel 402, Figure 4 The ELVSS in the equation is the cathode plate voltage received by the cathode plate. It should be understood that Figure 4 in 402, respectively represent the resistance of the driving circuit of the first display pixel 402, the resistance of the driving circuit of the second display pixel 402, and the resistance of the driving circuit of the Sth display pixel 402. Figure 4 in They represent the equivalent capacitance between the driving circuit and the cathode plate of the first display pixel 402, the equivalent capacitance between the driving circuit and the cathode plate of the second display pixel 402, to the equivalent capacitance between the driving circuit and the cathode plate of the Sth display pixel 402, respectively. Figure 4 in They respectively represent the display signal transmitted in the driving circuit of the first display pixel 402, the display signal transmitted in the driving circuit of the second display pixel 402, and the display signal transmitted in the driving circuit of the Sth display pixel 402.

[0059] It should be understood that the resistance of the driving circuit of each display pixel 402 is approximately equal, and the equivalent capacitance between the driving circuit and the cathode plate of each display pixel 402 is approximately equal, showing the equivalent capacitance between the driving circuit of pixel 402 and the cathode plate Impedance are also approximately equal. Therefore, when S display pixels 402 are driven simultaneously, the total signal interference is the superposition of the signal interferences generated by the drive circuits corresponding to the display pixels 402. , the total signal interference is: , and the signal interference multiplied by S and then divided by S can be converted to: ,because ,therefore , is the average value of the display signals received by the S display pixels 402, the display signal is generated by the display data, and Determined by the resistance and capacitance of the circuit itself, the reference data is linearly related to the average value of the displayed data, so a reference signal can be generated.

[0060] In the embodiment of the present application, the reference data and the average value of the display data are linearly related, and the reference data corresponding to the display data can be determined. Since the signal interference generated on the cathode plate by the drive circuit of the display pixel 402 when driving the display pixel 402 is related to the average value of the display data, when the reference data and the average value of the display data are linearly related, the simulated interference signal generated by the noise simulation unit 202 based on the reference signal can be equivalent to the interference signal generated by the display signal on the touch detection after coupling to the cathode plate in the electronic device. This can achieve the simulation of the signal interference generated by the display signal during touch detection using the simulated interference signal. Therefore, during touch detection, the signal interference generated by the display signal on touch detection can be offset by the simulated interference signal, thereby improving the touch detection sensitivity.

[0061] Figure 5 is a schematic diagram of a noise simulation unit provided in an embodiment of the present application, such as Figure 5As shown, the noise simulation unit 202 includes a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, and the display sub-chip 203 further includes a third resistor R3. The first end of the first resistor R1 is connected to the output end of the second driving unit 2034, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is respectively connected to the first end of the third resistor R3 and the first end of the second capacitor C2, the second end of the third resistor R3 is used to receive the cathode plate voltage of the cathode plate or the second end of the third resistor R3 is grounded, the second end of the second capacitor C2 is electrically connected to the touch sub-chip 201, the first end of the second resistor R2 is connected to the second end of the second capacitor C2, and the second end of the second resistor R2 receives the common-mode voltage VCMI of the driving signal.

[0062] The noise simulation unit 202 includes a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2. The first resistor R1 in the noise simulation unit 202 can simulate the equivalent resistance of the driving circuit of the display pixel 402, the first capacitor C1 can simulate the equivalent capacitance between the driving circuit of the display pixel 402 and the cathode plate, the second capacitor C2 can simulate the equivalent capacitance between the cathode plate and the electrode 401, the second resistor R2 can simulate the equivalent resistance of the electrode 401, and the third resistor R3 can simulate the resistance of the cathode plate. When the third resistor R3 receives the cathode plate voltage, the noise simulation unit 202 can simulate the voltage fluctuation of the cathode plate and the influence of the display signal coupled to the cathode plate on the touch detection. When the third resistor R3 is grounded, the noise simulation unit 202 will only simulate the influence of the display signal coupled to the cathode plate on the touch detection. After the second driving unit 2034 outputs the reference signal, the reference signal passes through the first resistor R1, the second resistor R2, the first capacitor C1 and the second capacitor C2, and the third resistor R3 and the cathode plate voltage received by the third resistor R3, to form a simulated interference signal. Through the circuit of the above-mentioned noise simulation unit 202, the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection can be simulated. Optionally, according to the above formula, the resistance value of the first resistor R1 can be set to the capacitance value of the first capacitor C1 can be set to the resistance value of the third resistor R3 can be set to The transmission and coupling process of the signal are simulated by setting the capacitance and resistance. It should be understood that the principles of the second capacitor C2 and the second resistor R2 are similar to the above, which will not be described here.

[0063] Optionally, when S display pixels 402 are simultaneously driven, the equivalent capacitance value between the driving circuit of the S display pixels 402 and the cathode plate is large, and at this time the capacitance can be reduced in proportion. The following will be specifically explained:

[0064] Multiplying both the numerator and denominator in the above formula by the coefficient Gain, we can obtain: , from the above formula, we can know that the resistance of the first resistor R1 can be set to , set the capacitance of the first capacitor C1 to , set the resistance of the third resistor R3 to The capacitance value of the capacitor can be reduced without affecting the generation of the analog interference signal. It should be understood that the principles of the second capacitor C2 and the second resistor R2 are similar to those described above and will not be repeated here.

[0065] In an embodiment of the present application, the noise simulation unit 202 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. The display sub-chip 203 also includes a third resistor R3. The first resistor R1 and the first capacitor C1 can be used to simulate the equivalent resistance and equivalent capacitance between the drive circuit of the display pixel 402 and the cathode plate, the third resistor R3 can be used to simulate the resistance of the cathode plate, and the second resistor R2 and the second capacitor C2 can be used to simulate the equivalent resistance and equivalent capacitance between the cathode plate and the electrode 401. The above circuit scheme can simulate the interference coupling path in which the display signal interferes with the touch detection, so that the reference signal generates a simulated interference signal after passing through the noise simulation unit 202. The display signal can be coupled to the cathode plate and then coupled from the cathode plate to the electrode 401 to simulate the signal interference caused by the touch detection. Therefore, when performing touch detection, the signal interference caused by the display signal to the touch detection can be offset according to the simulated interference signal, thereby improving the touch detection sensitivity.

[0066] Figure 6 is a schematic diagram of a touch sub-chip provided in an embodiment of the present application, such as Figure 6 As shown, the touch sub-chip 201 includes a processing unit 2011 and multiple identification units 2012. The multiple identification units 2012 are electrically connected to multiple electrodes 401 respectively, and different identification units 2012 are electrically connected to different electrodes 401. The identification unit 2012 can receive an analog interference signal and an induction signal generated by the connected electrode 401, and generate an identification signal based on the induction signal and the analog interference signal. The processing unit 2011 can perform touch detection based on the identification signal generated by at least some of the multiple identification units 2012.

[0067] The touch sub-chip 201 includes a processing unit 2011 and multiple recognition units 2012. The multiple recognition units 2012 are electrically connected to the processing unit 2011 respectively, and the multiple recognition units 2012 are electrically connected to the multiple electrodes 401 respectively. Different recognition units 2012 are electrically connected to different electrodes 401. When a finger touches, the electrode 401 in the finger touch area generates a sensing signal through self-capacitance or mutual capacitance. The recognition unit 2012 corresponding to the electrode 401 receives the sensing signal generated by the electrode 401. At the same time, the recognition unit 2012 receives the simulated interference signal sent by the noise simulation unit 202. Signal, touch detection is performed based on the sensing signal and the analog interference signal. In one example, when the touch sub-chip 201 performs touch detection, the touch detection is performed based on the common mode voltage of the sensing signal and the driving signal. When the touch sub-chip 201 receives the analog interference signal, the touch detection is performed based on the sensing signal, the analog interference signal and the common mode voltage. Optionally, the touch sub-chip 201 performs touch detection based on the sensing signal and the superimposed signal of the analog interference signal and the common mode voltage, thereby offsetting the interference signal that is coupled to the cathode plate by the analog interference signal and then coupled to the electrode 401 by the cathode plate.

[0068] The processing unit 2011 in the touch sub-chip 201 may be a processing unit with processing capabilities, such as a microcontroller unit (MCU). The processing unit 2011 receives the sensing signal sent by the recognition unit 2012 and performs touch detection according to the sensing signal.

[0069] In the embodiment of the present application, the touch sub-chip 201 includes a processing unit 2011 and multiple recognition units 2012. The recognition units 2012 can receive the sensing signals and analog interference signals generated by the connected electrodes 401 and generate recognition signals based on the analog interference signals and the sensing signals. The processing unit 2011 can perform touch detection based on the recognition signals generated by each recognition unit 2012, thereby realizing touch detection through the self-capacitance or mutual capacitance of the electrodes 401. Because the recognition units 2012 generate recognition signals based on the analog interference signals and the sensing signals, the analog interference signals can offset the signal interference caused by the display signal on the touch detection, thereby improving the signal-to-noise ratio in the recognition signals and enhancing the touch detection sensitivity.

[0070] Figure 7 is a schematic diagram of an identification unit provided in an embodiment of the present application, such as Figure 7As shown, the identification unit 2012 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and an operational amplifier D1. The first end of the fourth resistor R4 is connected to the electrode 401, the second end of the fourth resistor R4 is connected to the negative input terminal of the operational amplifier D1, the first end of the third capacitor C3 is connected to the negative input terminal of the operational amplifier D1, the second end of the third capacitor C3 is connected to the output terminal of the operational amplifier D1, the first end of the fifth resistor R5 is connected to the first end of the third capacitor C3, the second end of the fifth resistor R5 is connected to the second end of the third capacitor C3, the first end of the sixth resistor R6 is electrically connected to the output terminal of the noise simulation unit 202, the second end of the sixth resistor R6 is respectively connected to the first end of the seventh resistor R7 and the positive input terminal of the operational amplifier D1, and the second end of the seventh resistor R7 receives the common mode voltage VCMI of the drive signal.

[0071] The first end of the sixth resistor R6 is electrically connected to the output end of the noise simulation unit 202, and the second end of the sixth resistor R6 is electrically connected to the positive input end of the operational amplifier D1. The analog interference signal output by the noise simulation unit 202 can be input into the operational amplifier D1 through the sixth resistor R6, and the first end of the seventh resistor R7 is electrically connected to the positive input end of the operational amplifier D1. The second end of the seventh resistor R7 receives the common-mode voltage VCMI, so the common-mode voltage VCMI can be input into the positive input end of the operational amplifier D1. The positive input end of the operational amplifier D1 inputs a superimposed signal of the common-mode voltage VCMI and the analog interference signal.

[0072] The fifth resistor R5 can serve as a feedback resistor of the operational amplifier D1. A transimpedance amplifier circuit can be formed by the feedback resistor (fifth resistor R5), the third capacitor C3 and the operational amplifier D1. The negative input terminal of the operational amplifier D1 is connected to the electrode 401, and the positive input terminal of the operational amplifier D1 receives the superimposed signal of the common-mode voltage VCMI and the analog interference signal. The transimpedance amplifier circuit can convert the sensing signal (current signal) generated by the electrode 401 into an identification signal (voltage signal). Since the signal input to the positive input terminal of the operational amplifier D1 is the superimposed signal of the common-mode voltage VCMI and the analog interference signal, in the process of converting the sensing signal (current signal) generated by the electrode 401 into the identification signal (voltage signal), the operational amplifier D1 can offset the signal interference in the analog interference signal received at the positive input terminal and the sensing signal transmitted by the electrode 401.

[0073] In an embodiment of the present application, the fifth resistor R5 can serve as a feedback resistor of the operational amplifier D1. A transimpedance amplifier circuit can be formed by the feedback resistor (fifth resistor R5), the third capacitor C3 and the operational amplifier D1. The transimpedance amplifier circuit can convert the induced signal (current signal) generated by the electrode 401 into an identification signal (voltage signal), thereby realizing signal conversion. The positive input terminal of the operational amplifier D1 receives a superimposed signal of an analog interference signal and a common-mode signal, which can offset the signal interference coupled to the electrode 401 after the display signal is coupled to the cathode plate, thereby improving the sensitivity of touch detection.

[0074] Figure 8 is a schematic diagram of an identification unit including an amplification unit provided in an embodiment of the present application, such as Figure 8 As shown, the identification unit 2012 also includes: a first amplifying unit D2, the input end of the first amplifying unit D2 is respectively connected to the second end of the second capacitor C2 and the first end of the second resistor R2, the output end of the first amplifying unit D2 is connected to the first end of the sixth resistor R6, the first amplifying unit D2 can receive the analog interference signal and amplify the analog interference signal, so that the identification unit 2012 performs touch detection based on the sensing signal and the amplified analog interference signal.

[0075] In the embodiment of the present application, a first amplifying unit D2 may further be provided in the identification unit 2012. The input end of the first amplifying unit D2 is connected to the output end of the noise simulation unit 202, and the output end of the first amplifying unit D2 is connected to the first end of the sixth resistor R6. The first amplifying unit D2 may amplify the analog interference signal output by the noise simulation unit 202, thereby preventing the touch sub-chip 201 from being unable to perform touch detection based on the analog interference signal due to the low signal strength of the analog interference signal, resulting in an inability to cancel the signal interference in the electrode 401. This allows the identification unit 2012 to cancel the signal interference generated by the display signal on the touch detection based on the amplified analog interference signal, thereby improving the signal-to-noise ratio in the identification signal and improving the touch detection sensitivity.

[0076] In a possible implementation, at least one of the amplification factor of the first amplifying unit D2 , the resistance value of the sixth resistor R6 , and the resistance value of the seventh resistor R7 in the identification unit 2012 corresponding to at least some adjacent electrodes 401 is different.

[0077] The multiple electrodes 401 include multiple horizontal electrodes and multiple vertical electrodes. When the display sub-chip 203 drives the multiple display pixels 402, it drives the display pixels 402 in rows, that is, drives the display pixels 402 in one row to emit light at the same time, and then drives the display pixels 402 in the next row to emit light. When driving a row of display pixels 402 at the same time, the display pixels 402 closer to the display sub-chip 203 and the display pixels 402 farther from the display sub-chip 203 receive the display signal output by the display sub-chip 203 at the same time. However, the display pixels 402 farther from the display sub-chip 203 have longer driving lines than the display pixels 402 closer to the display sub-chip 203, and the line loss is greater, so that the display pixels 402 driven by the display sub-chip 203 are not as good as those driven by the display sub-chip 203. In the direction from near to far from the display sub-chip 203, the closer the display pixel 402 is to the display sub-chip 203, the greater the signal strength of the display signal received, and the stronger the signal interference caused. Since the electrode 401 includes multiple horizontal electrodes and multiple vertical electrodes, and the vertical electrodes are arranged perpendicular to the display pixel 402 row, the signal interference of the vertical electrodes close to the display sub-chip 203 is stronger, and the signal interference of the vertical electrodes far away from the display sub-chip 203 is weaker. By setting the amplification factor of the first amplifier unit D2, the resistance value of the sixth resistor R6, and the resistance value of the seventh resistor R7 to be different, different vertical electrodes receive analog interference signals of different strengths. As for the horizontal electrodes, due to the superposition effect of the cathode plate, some horizontal electrodes receive different signal interferences. Similarly, the amplification factor of the first amplifier unit D2, the resistance value of the sixth resistor R6, and the resistance value of the seventh resistor R7 can be set to be different, so that different horizontal electrodes receive analog interference signals of different strengths.

[0078] It should be noted that, since the signal interference received by adjacent horizontal electrodes or vertical electrodes may be the same, at least one of the amplification factor of the first amplification unit D2, the resistance value of the sixth resistor R6, and the resistance value of the seventh resistor R7 in the identification unit 2012 corresponding to at least some of the adjacent electrodes 401 is different, that is, the amplification factor of the first amplification unit D2, the resistance value of the sixth resistor R6, and the resistance value of the seventh resistor R7 in the identification unit 2012 corresponding to some of the electrodes 401 may be the same.

[0079] In an embodiment of the present application, at least one of the amplification factor of the first amplification unit D2 in the identification unit 2012, the resistance value of the sixth resistor R6, and the resistance value of the seventh resistor R7 corresponding to at least some of the adjacent electrodes 401 is different, so that the intensity of the analog interference signal received by at least some of the electrodes 401 can be different. The signal strength of the analog interference signal corresponding to the electrode 401 can be set according to the position of the electrode 401, which is more in line with the interference caused by the display signal to the electrode 401 in actual application, and can improve the cancellation effect of the signal interference caused by the display signal to the touch detection through the analog interference signal, thereby improving the touch detection sensitivity.

[0080] Figure 9 is a schematic diagram of a noise simulation unit including an amplification unit provided in an embodiment of the present application, such as Figure 9 As shown, the noise simulation unit 202 also includes: a second amplifying unit D3, the input end of the second amplifying unit D3 is respectively connected to the second end of the second capacitor C2 and the first end of the second resistor R2, the output end of the second amplifying unit D3 is respectively connected to the first end of the sixth resistor R6 in each identification unit 2012, and the second amplifying unit D3 can amplify the signal passing through the second capacitor C2 to obtain a simulated interference signal.

[0081] The noise simulation unit 202 may include a second amplifying unit D3. Compared with the solution of setting the first amplifying unit D2 in the aforementioned embodiment, the second amplifying unit D3 is not set in the identification unit 2012, but is separately set in the noise simulation unit 202. Since the output end of the second amplifying unit D3 is respectively connected to the first end of the sixth resistor R6 of each identification unit 2012, only one second amplifying unit D3 can be set in the touch display chip 200. Compared with the solution of setting the first amplifying unit D2 in each identification unit 2012 in the touch sub-chip 201 in the aforementioned embodiment, the cost can be reduced.

[0082] In an embodiment of the present application, the noise simulation unit 202 also includes a second amplifying unit D3, which can amplify the signal passing through the second capacitor C2 to obtain an analog interference signal with higher signal strength. This can prevent the touch sub-chip 201 from being unable to perform touch detection based on the analog interference signal due to the low signal strength of the analog interference signal, resulting in the inability to offset the signal interference in the electrode 401. Compared with the aforementioned embodiment in which the first amplifying unit D2 is set in the identification unit 2012, only one amplifying unit can be set in the touch display chip 200, thereby reducing the cost of the touch display chip 200.

[0083] In a possible implementation, at least one of the resistance value of the sixth resistor R6 and the resistance value of the seventh resistor R7 in the identification unit 2012 corresponding to at least some adjacent electrodes 401 is different.

[0084] Similar to the principle described in the aforementioned embodiment, the vertical electrodes close to the display sub-chip 203 are subject to stronger signal interference, and the vertical electrodes far away from the display sub-chip 203 are subject to weaker signal interference. For the horizontal electrodes, since the cathode plate has a superposition effect, some horizontal electrodes receive different signal interferences. Since only one second amplification unit D3 is provided in the noise simulation unit 202, at least some adjacent vertical electrodes can receive analog interference signals of different intensities and at least some adjacent horizontal electrodes can receive analog interference signals of different intensities by setting the resistance value of the sixth resistor R6 and the resistance value of the seventh resistor R7 to be different.

[0085] It should be noted that, since the signal interference received by adjacent horizontal electrodes or vertical electrodes may be the same, at least one of the resistance values ​​of the sixth resistor R6 and the resistance values ​​of the seventh resistor R7 in the identification unit 2012 corresponding to at least some of the adjacent electrodes 401 is different, that is, the resistance values ​​of the sixth resistor R6 and the resistance values ​​of the seventh resistor R7 in the identification unit 2012 corresponding to some of the electrodes 401 may be the same.

[0086] In an embodiment of the present application, at least one of the resistance values ​​of the sixth resistor R6 and the seventh resistor R7 in the identification unit 2012 corresponding to at least some of the adjacent electrodes 401 is different, so that the strength of the analog interference signal received by at least some of the electrodes 401 can be different. The signal strength of the analog interference signal corresponding to the electrode 401 can be set according to the position of the electrode 401, which is more in line with the interference caused by the display signal to the electrode 401 in actual application, and can improve the cancellation effect of the signal interference caused by the display signal to the touch detection through the analog interference signal, thereby improving the touch detection sensitivity.

[0087] In one possible implementation, the touch sub-chip 201 can perform touch detection based on the sensing signal and the analog interference signal when the display sub-chip 203 outputs the reference signal, and perform touch detection based on the sensing signal when the display sub-chip 203 stops outputting the reference signal.

[0088] It should be understood that in some application scenarios, the display sub-chip 203 does not output a display signal to drive the display pixel 402, but touch detection is required. For example, when the electronic device is a mobile phone and the screen is black, the display sub-chip 203 does not output a display signal to drive the display pixel 402, but the touch sub-chip 201 outputs a drive signal to the electrode 401 to perform touch detection. Alternatively, the user can choose whether the display sub-chip 203 outputs a reference signal to the noise simulation unit 202. For example, when the user selects the normal touch mode on the mobile phone program, the display sub-chip 203 does not output a reference signal, and the touch sub-chip 201 performs touch detection based on the sensing signal generated by the electrode 401. When the user selects the anti-interference touch mode on the mobile phone program, the display sub-chip 203 outputs a reference signal, and the touch sub-chip 201 performs touch detection based on the simulated interference signal and the sensing signal generated by the electrode 401.

[0089] In an embodiment of the present application, the touch sub-chip 201 can perform touch detection based on the sensing signal and the analog interference signal when the display sub-chip 203 sends a reference signal, and perform touch detection based on the sensing signal when the display sub-chip 203 stops sending the reference signal. This makes it suitable for touch detection in scenarios where the display chip does not output a display signal, and the user can choose whether to perform touch detection based on the analog interference signal. The user can freely choose between low-power touch detection (does not generate an analog interference signal and does not perform touch detection based on the analog interference signal) and high-sensitivity touch detection (generates an analog interference signal and performs touch detection based on the analog interference signal), and the user has a high degree of freedom.

[0090] Figure 10 is a schematic diagram of an identification unit including a switch provided in an embodiment of the present application, such as Figure 10 As shown, the identification unit 2012 also includes: a first switch K1 and a second switch K2, the second end of the first switch K1 is electrically connected to the positive input terminal of the operational amplifier D1, the first end of the first switch K1 is used to receive the common-mode voltage VCMI, the first end of the second switch K2 is respectively connected to the second end of the sixth resistor R6 and the first end of the seventh resistor R7, and the second end of the second switch K2 is electrically connected to the positive input terminal of the operational amplifier D1. When the display sub-chip 203 outputs a reference signal, the first switch K1 is disconnected and the second switch K2 is closed. When the display sub-chip 203 stops outputting the reference signal, the first switch K1 is closed and the second switch K2 is disconnected.

[0091] In an embodiment of the present application, when the display sub-chip 203 outputs a reference signal, the first switch K1 is disconnected and the second switch K2 is closed. When the display sub-chip 203 stops outputting the reference signal, the first switch K1 is closed and the second switch K2 is disconnected. This enables touch detection to be performed based on the sensing signal and the analog interference signal when the display sub-chip 203 sends a reference signal, and touch detection to be performed based on the sensing signal when the display sub-chip 203 stops sending the reference signal. Users can freely choose between low-power touch detection (no analog interference signal is generated, and touch detection is not performed based on the analog interference signal) and high-sensitivity touch detection (analog interference signal is generated, and touch detection is performed based on the analog interference signal), and users have a high degree of freedom.

[0092] An embodiment of the present application also provides a display chip, which is applied to electronic devices. The display chip can send display signals to multiple display pixels to make the display pixels emit light, and send a reference signal to a noise simulation unit, so that the noise simulation unit generates an analog interference signal based on the reference signal, so that the touch chip performs touch detection based on the sensing signal generated by the electrode and the analog interference signal, wherein the analog interference signal is used to simulate the interference signal generated by the touch detection after the display signal is coupled to the cathode plate in the electronic device.

[0093] In the embodiment of the present application, the display chip may be the display sub-chip 203 in any of the aforementioned embodiments. The specific structure and interaction of the display chip may refer to the description of the display sub-chip 203 in any of the aforementioned embodiments, and will not be repeated here.

[0094] An embodiment of the present application also provides a touch chip, which is applied to electronic devices. The touch chip can output a driving signal to the electrode and perform touch detection based on the sensing signal and analog interference signal generated by the electrode. The analog interference signal is used to simulate the interference signal generated by the touch detection after the display signal is coupled to the cathode plate in the electronic device. The analog interference signal is generated by a noise simulation unit based on a reference signal, and the display signal and the reference signal are output by the display chip.

[0095] In the embodiment of the present application, the touch chip may be the touch sub-chip 201 in any of the aforementioned embodiments. The specific structure and interaction of the touch chip may refer to the description of the touch sub-chip 201 in any of the aforementioned embodiments, which will not be repeated here.

[0096] Figure 11 is a schematic diagram of a touch display system provided in an embodiment of the present application, such as Figure 11 As shown, the touch display system 300 includes a noise simulation unit, a display chip in any of the aforementioned embodiments, and a touch chip in any of the aforementioned embodiments.

[0097] In the embodiments of the present application, the touch chip can be the touch sub-chip 201 in any of the aforementioned embodiments, the noise simulation unit can be the noise simulation unit 202 in any of the aforementioned embodiments, and the display chip can be the display sub-chip 203 in any of the aforementioned embodiments. The specific structures and interactions of the touch chip, display chip, and noise simulation unit can be found in the descriptions of the touch sub-chip 201, noise simulation unit 202, and display sub-chip 203 in any of the aforementioned embodiments, and will not be repeated here. It should be noted that the difference between the touch display system 300 and the touch display chip 200 is that the touch chip, display chip, and noise simulation unit in this system can be independently configured, rather than being packaged in the same chip as in the touch display chip 200.

[0098] An embodiment of the present application further provides a display screen, which includes a plurality of electrodes, a plurality of display pixels, and the touch display chip 200 or the touch display system 300 in any of the aforementioned embodiments.

[0099] An embodiment of the present application further provides an electronic device, comprising the display screen in the aforementioned embodiment.

[0100] It should be pointed out that, according to the needs of implementation, the various components / steps described in the embodiments of the present application can be split into more components / steps, or two or more components / steps or partial operations of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present application.

[0101] Those skilled in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0102] The above implementation methods are only used to illustrate the embodiments of the present application, and are not intended to limit the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present application, and the scope of patent protection of the embodiments of the present application should be defined by the claims.

Claims

1. A touch display chip, used in electronic equipment, characterized in that: include: Touch sub-chip, display sub-chip and noise simulation unit; The display sub-chip is electrically connected to a plurality of display pixels in the electronic device, the touch sub-chip is electrically connected to a plurality of electrodes in the electronic device, and the noise simulation unit is electrically connected to the touch sub-chip and the display sub-chip respectively; The display sub-chip is configured to send display signals to the plurality of display pixels to make the display pixels emit light, and to send a reference signal to the noise simulation unit; The noise simulation unit is configured to generate a simulated interference signal based on the reference signal, wherein the simulated interference signal is configured to simulate an interference signal on touch detection generated by the display signal being coupled to a cathode plate in the electronic device; The touch sub-chip is used to output a driving signal to the electrode and perform touch detection based on the sensing signal generated by the electrode and the analog interference signal; The display sub-chip includes: an acquisition unit, a calculation unit, a plurality of first driving units and a second driving unit; The acquisition unit is used to acquire display data; The first driving unit is configured to send the display signal to the display pixel corresponding to the first driving unit according to the display data; The calculation unit is used to calculate reference data according to the display data; The second driving unit is configured to send the reference signal to the noise simulation unit according to the reference data; The noise simulation unit includes: a first resistor, a second resistor, a first capacitor and a second capacitor; The display sub-chip further includes: a third resistor; The first end of the first resistor is connected to the output end of the second driving unit, the second end of the first resistor is connected to the first end of the first capacitor, the second end of the first capacitor is respectively connected to the first end of the third resistor and the first end of the second capacitor, the second end of the third resistor is used to receive the cathode plate voltage of the cathode plate or the second end of the third resistor is grounded, the second end of the second capacitor is electrically connected to the touch sub-chip, the first end of the second resistor is connected to the second end of the second capacitor, and the second end of the second resistor receives the common mode voltage of the driving signal.

2. The touch display chip according to claim 1, wherein: The electrodes include multiple horizontal electrodes and / or multiple vertical electrodes, and the touch control sub-chip outputs the driving signal to one of the multiple horizontal electrodes and the multiple vertical electrodes, and receives the sensing signal output by the other of the multiple horizontal electrodes and the multiple vertical electrodes; alternatively, at least one of the multiple horizontal electrodes and the multiple vertical electrodes serves as both a driving electrode and a receiving electrode, and the touch control sub-chip sends the driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode.

3. The touch display chip according to claim 1, wherein: The reference data is in a linear relationship with an average value of the display data.

4. The touch display chip according to claim 1, wherein: The touch control sub-chip includes a processing unit and multiple recognition units; The plurality of recognition units are electrically connected to the plurality of electrodes respectively, and different recognition units are electrically connected to different electrodes; The identification unit is configured to receive the simulated interference signal and the induction signal generated by the connected electrode, and generate an identification signal according to the induction signal and the simulated interference signal; The processing unit is configured to perform touch detection according to the recognition signals generated by at least some of the recognition units.

5. The touch display chip according to claim 4, characterized in that: The identification unit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor and an operational amplifier; The first end of the fourth resistor is connected to the electrode, the second end of the fourth resistor is connected to the negative input terminal of the operational amplifier, the first end of the third capacitor is connected to the negative input terminal of the operational amplifier, the second end of the third capacitor is connected to the output terminal of the operational amplifier, the first end of the fifth resistor is connected to the first end of the third capacitor, the second end of the fifth resistor is connected to the second end of the third capacitor, the first end of the sixth resistor is electrically connected to the second end of the second capacitor, the second end of the sixth resistor is respectively connected to the first end of the seventh resistor and the positive input terminal of the operational amplifier, and the second end of the seventh resistor receives the common mode voltage of the drive signal.

6. The touch display chip according to claim 5, characterized in that: The identification unit further includes: a first amplification unit; The input end of the first amplifying unit is connected to the second end of the second capacitor and the first end of the second resistor respectively, and the output end of the first amplifying unit is connected to the first end of the sixth resistor; The first amplifying unit is configured to receive the analog interference signal and amplify the analog interference signal, so that the recognition unit performs touch detection based on the sensing signal and the amplified analog interference signal.

7. The touch display chip according to claim 6, wherein: At least one of the amplification factor of the first amplifying unit in the identification unit, the resistance value of the sixth resistor, and the resistance value of the seventh resistor corresponding to at least some adjacent electrodes is different.

8. The touch display chip according to claim 5, characterized in that: The noise simulation unit further includes: a second amplifying unit; The input end of the second amplifying unit is connected to the second end of the second capacitor and the first end of the second resistor respectively, and the output end of the second amplifying unit is connected to the first end of the sixth resistor in each of the identification units respectively; The second amplifying unit is configured to amplify the signal passing through the second capacitor to obtain the analog interference signal.

9. The touch display chip according to claim 8, characterized in that: At least one of the resistance value of the sixth resistor and the resistance value of the seventh resistor in the identification unit corresponding to at least some adjacent electrodes is different.

10. The touch display chip according to claim 5, characterized in that: The touch sub-chip is used to perform touch detection based on the sensing signal and the analog interference signal when the display sub-chip outputs the reference signal, and to perform touch detection based on the sensing signal when the display sub-chip stops outputting the reference signal.

11. The touch display chip according to claim 10, wherein: The identification unit further includes: a first switch and a second switch; The second end of the first switch is electrically connected to the positive input terminal of the operational amplifier, the first end of the first switch is used to receive the common-mode voltage, the first end of the second switch is respectively connected to the second end of the sixth resistor and the first end of the seventh resistor, and the second end of the second switch is connected to the positive input terminal of the operational amplifier; When the display sub-chip outputs the reference signal, the first switch is opened and the second switch is closed; When the display sub-chip stops outputting the reference signal, the first switch is closed and the second switch is opened.

12. A display chip, used in electronic equipment, characterized in that: The display chip is configured to send display signals to a plurality of display pixels to cause the display pixels to emit light, and to send a reference signal to a noise simulation unit to cause the noise simulation unit to generate an analog interference signal based on the reference signal, so that the touch chip performs touch detection based on the sensing signal generated by the electrode and the analog interference signal. The analog interference signal is configured to simulate the interference signal generated by the display signal coupled to the cathode plate in the electronic device and generated during touch detection. The display chip includes: an acquisition unit, a calculation unit, a plurality of first driving units and a second driving unit; The acquisition unit is used to acquire display data; The first driving unit is configured to send the display signal to the display pixel corresponding to the first driving unit according to the display data; The calculation unit is used to calculate reference data according to the display data; The second driving unit is configured to send the reference signal to the noise simulation unit according to the reference data; The noise simulation unit includes: a first resistor, a second resistor, a first capacitor and a second capacitor; The display chip further includes: a third resistor; The first end of the first resistor is connected to the output end of the second driving unit, the second end of the first resistor is connected to the first end of the first capacitor, the second end of the first capacitor is respectively connected to the first end of the third resistor and the first end of the second capacitor, the second end of the third resistor is used to receive the cathode plate voltage of the cathode plate or the second end of the third resistor is grounded, the second end of the second capacitor is electrically connected to the touch chip, the first end of the second resistor is connected to the second end of the second capacitor, and the second end of the second resistor receives the common mode voltage of the drive signal output by the touch chip.

13. A touch chip, used in electronic equipment, characterized in that: The touch chip is used to output a driving signal to the electrode and perform touch detection based on the sensing signal and analog interference signal generated by the electrode, wherein the analog interference signal is used to simulate the interference signal generated by the touch detection after the display signal is coupled to the cathode plate in the electronic device. The analog interference signal is generated by a noise simulation unit based on a reference signal. The display signal and the reference signal are output by the display chip as described in claim 12.

14. A touch display system, characterized in that: The device comprises a noise simulation unit, the display chip as claimed in claim 12 and the touch control chip as claimed in claim 13.

15. A display screen, characterized in that: The device comprises a plurality of electrodes, a plurality of display pixels and the touch display chip according to any one of claims 1 to 11 or the touch display system according to claim 14.

16. An electronic device, characterized in that: Comprising the display screen as claimed in claim 15.

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