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

Abstract

The invention provides a touch display chip, a display chip, a touch chip, a touch display system, a display screen and electronic equipment, 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 with the touch sub-chip and the display sub-chip respectively; the display sub-chip can send a display signal to the plurality of display pixels to enable the display pixels to emit light and send a reference signal to the noise simulation unit; the noise simulation unit can generate a simulation interference signal according to the reference signal, and the simulation interference signal is used for simulating an interference signal generated on touch detection after the display signal is coupled to the negative plate; the touch control sub-chip can output driving signals to the electrodes and conduct touch control detection according to induction signals and analog interference signals generated by the electrodes. According to the touch display chip provided by the invention, signal interference of the display signal on touch detection can be offset during touch detection, and the sensitivity of touch detection is improved.

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 human-computer interaction method. Users can interact with an electronic device by touching or making gesture operations on the touch area of the electronic device. With the development of intelligent devices, touch technology has become the mainstream operation method of electronic devices such as mobile phones. Electronic devices such as mobile phones receive touch commands input by users on the display screen and identify corresponding touch operations according to the touch commands.

[0003] Currently, 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. The touch chip of the electronic device performs touch detection according to the induction signal generated by the electrode, and the display chip sends a display signal to the display pixels to drive the display pixels to display an image.

[0004] However, when the display chip sends a display signal to the display pixels to drive the display pixels 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 touch detection and resulting in low sensitivity of touch detection. Summary of the Invention

[0005] In view of this, the 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 problems.

[0006] According to a first aspect of the embodiments of the present application, there is provided a touch display chip 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 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 a display signal to the plurality of display pixels to make the display pixels emit light and send a reference signal to the noise simulation unit; the noise simulation unit is configured to generate an analog interference signal according to the reference signal, and 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 on touch detection; the touch sub-chip is configured to output a driving signal to the electrode and perform touch detection according to the induction signal generated by the electrode and the analog interference signal.

[0007] In a possible implementation, the electrode includes a plurality of horizontal electrodes and / or a plurality of vertical electrodes. The touch control chip outputs the driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and receives the induction signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes. Alternatively, at least one of the plurality of horizontal electrodes and the plurality of vertical electrodes serves as both a driving electrode and a receiving electrode. The touch control chip sends the driving signal to the driving electrode and receives the induction 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 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 configured 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.

[0009] In a possible implementation, the reference data has a linear relationship with the 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 the 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 unit is configured to receive the analog interference signal and the induction signal generated by the connected electrode, and generate an identification signal according to the induction signal and the analog interference signal; the processing unit is configured to perform touch detection according to the identification signals generated by at least some of the plurality of identification units.

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

[0013] In a possible implementation, the recognition unit further includes: a first amplification unit; an input terminal of the first amplification unit is respectively connected to a second end of the second capacitor and a first end of the second resistor, and an output terminal of the first amplification unit is connected to a first end of the sixth resistor; the first amplification unit is configured to receive the analog interference signal and perform amplification processing on the analog interference signal, so that the recognition unit performs touch detection based on the induction signal and the amplified analog interference signal.

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

[0015] In a possible implementation, the noise simulation unit further includes: a second amplification unit; an input terminal of the second amplification unit is respectively connected to a second end of the second capacitor and a first end of the second resistor, and an output terminal of the second amplification unit is respectively connected to a first end of the sixth resistor in each recognition unit; the second amplification unit is configured to perform amplification processing on the signal passing through the second capacitor to obtain the analog interference signal.

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

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

[0018] In a possible implementation, the recognition unit further includes: a first switch and a second switch; a second end of the first switch is electrically connected to a positive input terminal of the operational amplifier, a first end of the first switch is configured to receive the common-mode voltage, and a first end of the second switch is respectively connected to a second end of the sixth resistor and a first end of the seventh resistor; when the display sub-chip outputs the reference signal, the first switch is turned off and the second switch is turned on; when the display sub-chip stops outputting the reference signal, the first switch is turned on and the second switch is turned off.

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

[0020] According to a third aspect of the embodiments of the present application, there is provided a touch control chip, configured to output a driving signal to an electrode, and perform touch control detection according to an induction signal generated by the electrode and an analog interference signal, wherein the analog interference signal is used to simulate an interference signal generated by the display signal coupled to a cathode plate in the electronic device on the touch control detection, the analog interference signal is generated by the noise simulation unit according to 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, there is provided a touch control display system, including a noise simulation unit, the display chip as described in the second aspect, and the touch control chip as described in the third aspect.

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

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

[0024] According to the touch display chip provided by the embodiments 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 a plurality of display pixels. The noise simulation unit can generate an analog interference signal according to the reference signal. The touch sub-chip can send a driving signal to the electrode, and when a finger touches, perform touch detection according to the induction signal generated by the electrode and the analog interference signal generated by the noise simulation unit. Since the analog interference signal can simulate the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection, when the touch sub-chip performs touch detection according to the induction signal and the analog interference signal, the signal interference of the display signal on the touch detection can be cancelled by the analog interference signal, the interference of external signals during touch detection can be reduced, and the sensitivity of touch detection can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings according to these drawings.

[0026] Figure 1 is a schematic diagram of a display screen stack provided by the embodiments of the present application; Figure 2 is a schematic diagram of a touch display chip provided by the embodiments of the present application; Figure 3 is a schematic diagram of a display sub-chip provided by the embodiments of the present application; Figure 4 is a schematic diagram of the principle of signal interference provided by the embodiments of the present application; Figure 5 is a schematic diagram of a noise simulation unit provided by the embodiments of the present application; Figure 6 is a schematic diagram of a touch sub-chip provided by the embodiments of the present application; Figure 7 is a schematic diagram of an identification unit provided by the embodiments of the present application; Figure 8 is a schematic diagram of an identification unit including an amplification unit provided by the embodiments of the present application; Figure 9 is a schematic diagram of a noise simulation unit including an amplification unit provided by the embodiments of the present application; Figure 10 is a schematic diagram of an identification unit including a switch provided by the embodiments of the present application; Figure 11It is a schematic diagram of a touch display system provided by an embodiment of the present application. Detailed implementation manners

[0027] 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 accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the embodiments of the present application.

[0028] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also 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 includes any and all possible combinations of one or more of the associated listed items.

[0029] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0030] As mentioned above, touch technology is a way of human-computer interaction. Users can interact with an electronic device by touching or making gesture operations on the touch area of the electronic device. With the development of intelligent devices, touch technology has become the mainstream operation method of electronic devices such as mobile phones. Electronic devices such as mobile phones receive the touch instructions input by users on the display screen and identify the corresponding touch operations according to the touch instructions. Currently, 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 It is a schematic diagram of a display screen stack provided by an embodiment of the present application, as Figure 1As shown in the figure, the stack of the display screen from top to bottom is a flexible cover plate 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 substrate 108 made of silicon. 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 induction 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 a Mg-Ag alloy (magnesium-silver alloy), which can be equivalent to many distributed resistors connected 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, and the interference signal on the cathode plate is coupled into the electrode of the electrode layer, resulting in low sensitivity of the touch detection.

[0031] 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 a plurality of display pixels. The noise simulation unit can generate an analog interference signal according to the reference signal. The touch sub-chip can send a drive signal to the electrode and, when a finger touches, perform touch detection according to the induction signal generated by the electrode and the analog interference signal generated by the noise simulation unit. Since the analog interference signal can simulate the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection, when the touch sub-chip performs touch detection according to the induction signal and the analog interference signal, the analog interference signal can cancel the signal interference of the display signal on the touch detection, reduce the interference of external signals during touch detection, and improve the sensitivity of touch detection.

[0032] Figure 2 It is a schematic diagram of a touch display chip provided by an embodiment of the present application. The touch display chip 200 is applied to an electronic device, such as Figure 2 As shown in the figure, 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 a plurality of display pixels 402 in the electronic device. The touch sub-chip 201 is electrically connected to a plurality of electrodes 401 in the electronic device. The noise simulation unit 202 is electrically connected to the touch sub-chip 201 and the display sub-chip 203 respectively.

[0033] The display sub-chip 203 can send display signals to multiple display pixels 402, causing the display pixels 402 to emit light, and send a reference signal to the noise simulation unit 202. The noise simulation unit 202 can generate an analog interference signal according to 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 on touch detection. The touch sub-chip 201 can output a drive signal to the electrode 401, and perform touch detection according to the induction signal generated by the electrode 401 and the analog interference signal.

[0034] The display sub-chip 203 is electrically connected to multiple display pixels 402 in the electronic device through drive lines. The display sub-chip 203 can send display signals to the multiple display pixels 402. Through the display signals, at least some of the multiple display pixels 402 can be driven to emit light. For example, the R pixels, G pixels, and B pixels in the multiple display pixels 402 can be controlled to emit light respectively, so that the display screen of the electronic device displays the corresponding image. It should be understood that generally, the display pixels 402 are arranged in rows and columns. The display sub-chip 203 drives the display pixels row by row, causing the display pixels 402 to be refreshed row by row. When the display sub-chip 203 drives the display pixels 402, it will send display signals to a row of display pixels 402 at the same time. 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 drive lines between the multiple display pixels 402 and the display sub-chip 203 will couple the transmitted display signals to the cathode plate to generate interference signals, and the interference signals will be coupled to the electrode 401 on the other side of the cathode plate, affecting touch detection.

[0035] 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 is positively correlated with the display signal. The stronger the signal intensity of the display signal, the stronger the signal intensity of the reference signal. After receiving the reference signal, the noise simulation unit 202 generates an analog interference signal according to the reference signal. The analog interference signal can simulate the signal interference generated by the display signal on touch detection.

[0036] The touch sub-chip 201 can output a drive signal to the electrode 401. In one example, the drive signal can be a signal with a square wave waveform, a sine wave waveform, a trapezoidal wave waveform, etc. The electrode 401 receives the drive signal. When a finger touches, the electrode 401 detects the touch position of the finger through self-capacitance or mutual capacitance, generating an induction signal. The touch sub-chip 201 can perform touch recognition according to the induction signal and the analog interference signal sent by the noise simulation unit 202. Specifically, when the touch sub-chip 201 performs touch detection according to the induction signal, it can cancel the signal interference in the induction signal due to the display signal coupled to the electrode 401 through the analog interference signal.

[0037] 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 according to the reference signal. The touch sub-chip 201 can send a driving signal to the electrode 401, and during finger touch, perform touch detection according to the induction signal generated by the electrode 401 and the analog interference signal generated by the noise simulation unit 202. Since the analog interference signal can simulate the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection, when the touch sub-chip 201 performs touch detection according to the induction signal and the analog interference signal, the signal interference of the display signal on the touch detection can be cancelled by the analog interference signal, the interference of external signals during touch detection can be reduced, and the sensitivity of touch detection can be improved.

[0038] In a possible implementation manner, the electrode 401 includes a plurality of horizontal electrodes and / or a plurality of vertical electrodes. The touch sub-chip 201 outputs a driving signal to one of the plurality of horizontal electrodes and the plurality of vertical electrodes, and receives the induction signal output by the other of the plurality of horizontal electrodes and the plurality of vertical electrodes. Alternatively, at least one of the plurality of horizontal electrodes and the plurality of 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 receives the induction signal output by the receiving electrode.

[0039] One of the plurality of horizontal electrodes and the plurality of 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 plurality of horizontal electrodes and the plurality of vertical electrodes serves as a receiving electrode and outputs an induction signal. The touch sub-chip 201 performs touch detection according to the induction signal and the analog interference signal, and can identify the touch position of the finger. This method is a mutual capacitance detection method.

[0040] In addition, in another possible implementation, a self-capacitance detection method can be superimposed to detect the touch position of a 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 induction 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 induction 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 induction signals output by the multiple vertical electrodes (receiving electrodes), or the touch sub-chip 201 simultaneously outputs driving signals to the multiple horizontal electrodes and the multiple vertical electrodes and simultaneously receives the induction signals output by the multiple horizontal electrodes and the multiple vertical electrodes. The touch sub-chip 201 performs touch detection based on the received induction signal and the analog interference signal.

[0041] In one example, when the touch sub-chip 201 performs touch detection based on the induction signal and the analog interference signal, it can first detect the induction signal generated by the horizontal electrodes to obtain the Y-axis coordinate of the touch position, and then detect the induction signal generated by the vertical electrodes 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 induction signals generated by the horizontal electrodes and the vertical electrodes to directly obtain the X-axis coordinate and the Y-axis coordinate of the touch position. In another example, the touch sub-chip 201 can only detect the induction signal generated by the horizontal electrodes or the vertical electrodes, that is, only detect the X-axis coordinate or the Y-axis coordinate of the touch position, which can be applicable to scenarios with relatively low requirements for detection accuracy. The specific detection method can be set as needed and is not limited here.

[0042] In the embodiment of the present application, the touch sub-chip 201 can output a driving signal to the electrode 401. When a finger touches, an induction signal can be generated through the electrode 401 in a self-capacitance or mutual-capacitance manner. The touch sub-chip 201 can perform touch detection based on the induction signal and the analog interference signal, realizing touch detection through the self-capacitance or mutual-capacitance of the electrode 401. Touch detection through the mutual-capacitance of the electrode 401 can achieve high-precision multi-point touch and improve the anti-interference ability of touch detection. Touch detection through the self-capacitance of the electrode 401 can reduce costs and increase the signal strength of the induction signal. Therefore, touch detection can be set through the self-capacitance or mutual-capacitance of the electrode 401 according to the usage scenario, with high applicability.

[0043] Figure 3 is a schematic diagram of a display sub-chip provided by an embodiment of the present application, as Figure 3As shown, the display sub-chip 203 includes: an acquisition unit 2031, a calculation unit 2032, a plurality of first driving units 2033, and a second driving unit 2034. The acquisition unit 2031 can acquire display data. The first driving unit 2033 can send a display signal to the display pixel 402 corresponding to the first driving unit 2033 according to the display data. The calculation unit 2032 can calculate reference data according to the display data. The second driving unit 2034 can send a reference signal to the noise simulation unit 202 according to the reference data.

[0044] 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 display data. For example, the display data can be obtained after signal processing and compensation processing of 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 the acquisition unit 2031 acquires the display data, a display signal is sent to the plurality of display pixels 402 through the plurality of first driving units 2033 according to the display data. In one example, the first driving unit 2033 can be a digital-to-analog conversion (DAC). Through the DAC, the display data (digital signal) received by the acquisition unit 2031 can be converted into a display signal (analog signal), and the display pixel 402 corresponding to the first driving unit 2033 can be driven by the display signal.

[0045] 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 the signal interference caused by the display signal transmitted in the driving line to the touch detection according to the display data, that is, calculate reference data according to the display data. The second driving unit 2034 can output a reference signal according to the reference data. In one example, the second driving unit 2034 can be a DAC. Through the DAC, the reference data (digital signal) calculated by the calculation unit 2032 can be converted into a reference signal (analog signal) and the reference signal can be sent to the noise simulation unit 202.

[0046] In an embodiment of the present application, the display sub-chip 203 includes an acquisition unit 2031, a calculation unit 2032, a plurality of first driving units 2033, and a second driving unit 2034. The acquisition unit 2031 can acquire display data. The first driving unit 2033 can send a display signal to the display pixel 402 corresponding to the first driving unit 2033 according to the display data. Thus, a plurality of display pixels 402 can be driven to emit light by the plurality of first driving units 2033 according to the display data. The calculation unit 2032 can calculate reference data according to the display data. The second driving unit 2034 can send a reference signal to the noise simulation unit 202 according to the reference data, so as to output the reference signal. Since the reference signal is generated according to the display data, the analog interference signal generated by the noise simulation unit 202 according to the reference signal can simulate the signal interference generated by the display signal on the touch detection. Therefore, when performing touch detection, the signal interference generated by the display signal on the touch detection can be cancelled according to the analog interference signal, and the touch detection sensitivity can be improved.

[0047] In a possible implementation manner, the reference data has a linear relationship with the average value of the display data.

[0048] The following is an exemplary description of the specific principle. Figure 4 It is a schematic diagram of the principle of a signal interference provided by an embodiment of the present application. As Figure 4 shown, when driving S display pixels 402 simultaneously, all S display pixels 402 generate signal interference on the cathode plate. When the display sub-chip 203 only sends a driving signal to one of the S display pixels 402, the noise coupled to the cathode plate by the driving line of this display pixel 402 is: , is used to characterize the signal interference generated by the first display pixel 402. is used to characterize the cathode plate resistance. is used to characterize the resistance of the driving line of the display pixel 402. is used to characterize the equivalent capacitance between the driving line of the display pixel 402 and the cathode plate. The impedance of is used to characterize the display signal transmitted in the driving line of the first display pixel 402. Figure 4 The ELVSS in Figure 4 is the cathode plate voltage received by the cathode plate. It should be understood that respectively represent the resistance of the driving line of the first display pixel 402, the resistance of the driving line of the second display pixel 402, to the resistance of the driving line of the Sth display pixel 402. Figure 4 The respectively represent the equivalent capacitance between the driving line of the first display pixel 402 and the cathode plate, the equivalent capacitance between the driving line of the second display pixel 402 and the cathode plate, and up to the equivalent capacitance between the driving line of the S-th display pixel 402 and the cathode plate. Figure 4 in respectively represent the display signals transmitted in the driving line of the first display pixel 402, the display signals transmitted in the driving line of the second display pixel 402, and up to the display signals transmitted in the driving line of the S-th display pixel 402.

[0049] It should be understood that the resistance of the driving line of each display pixel 402 is approximately equal, and the equivalent capacitance between the driving line of each display pixel 402 and the cathode plate is approximately equal. The impedance of the equivalent capacitance between the driving line of the display pixel 402 and the cathode plate is also approximately equal. Therefore, when driving S display pixels 402 simultaneously, the total signal interference is the superposition of the signal interferences generated by the driving lines corresponding to each display pixel 402. , the total signal interference is: , and multiplying this signal interference by S and then dividing by S can be converted to: , since , therefore , is the average value of the display signals received by S display pixels 402. The display signals are generated from display data, and is determined by the resistance and capacitance of the circuit itself. Therefore, a reference signal can be generated with a linear relationship between the reference data and the average value of the display data.

[0050] In the embodiment of the present application, since there is a linear relationship between the reference data and the average value of the display data, the reference data corresponding to the display data can be determined. When driving the display pixel 402, the signal interference generated by the driving line of the display pixel 402 on the cathode plate is related to the average value of the display data. When the reference data and the average value of the display data are in a linear relationship, the analog interference signal generated by the noise simulation unit 202 according to the reference signal can be equivalent to the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection. Thus, when performing touch detection, the signal interference generated by the display signal on the touch detection can be canceled according to the analog interference signal, improving the touch detection sensitivity.

[0051] Figure 5 is a schematic diagram of a noise simulation unit provided by an embodiment of the present application, 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. 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 control sub-chip 201. The first end of the second resistor R2 is connected to the second end of the second capacitor C2. The second end of the second resistor R2 receives the common-mode voltage VCMI of the driving signal.

[0052] 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 line of the display pixel 402. The first capacitor C1 can simulate the equivalent capacitance between the driving line 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. 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 on touch detection after the display signal is coupled to the cathode plate. When the third resistor R3 is grounded, the noise simulation unit 202 only simulates the influence on touch detection after the display signal is coupled to the cathode plate. After the second driving unit 2034 outputs a reference signal, the reference signal passes through the first resistor R1, the second resistor R2, the first capacitor C1, and the second capacitor C2, as well as the cathode plate voltage received by the third resistor R3 and the third resistor R3, to form an analog interference signal. Through the circuit of the above noise simulation unit 202, it is possible to realize the interference signal generated by the display signal coupled to the cathode plate in the electronic device on the touch detection. Optionally, according to the above formula, the resistance value of the first resistor R1 can be set to and the capacitance value of the first capacitor C1 can be set to and the resistance value of the third resistor R3 can be set to to realize the simulation of the signal transmission and coupling process by setting capacitors and resistors. It should be understood that the principles of the second capacitor C2 and the second resistor R2 are similar to the above and will not be elaborated here.

[0053] Optionally, since when driving S display pixels 402 simultaneously, the equivalent capacitance value between the driving lines of the S display pixels 402 and the cathode plate is relatively large, the capacitance can be reduced proportionally at this time. The following is a specific description: Multiplying both the numerator and denominator in the foregoing formula by the coefficient Gain, we can obtain: As can be seen from the above formula, the resistance value of the first resistor R1 can be set to and the capacitance value of the first capacitor C1 can be set to and the resistance value of the third resistor R3 can be set 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 the above and will not be elaborated here.

[0054] In the 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 further includes a third resistor R3. The equivalent resistance and equivalent capacitance between the driving line of the display pixel 402 and the cathode plate can be simulated by the first resistor R1 and the first capacitor C1. The resistance of the cathode plate can be simulated by the third resistor R3. The equivalent resistance and equivalent capacitance between the cathode plate and the electrode 401 can be simulated by the second resistor R2 and the second capacitor C2. The interference coupling path of the signal interference generated by the display signal on the touch detection can be simulated by the above circuit solution, so that the reference signal generates an analog interference signal after passing through the noise simulation unit 202, and the signal interference generated by the display signal coupled to the cathode plate and then coupled from the cathode plate to the electrode 401 on the touch detection can be simulated. Therefore, when performing touch detection, the signal interference generated by the display signal on the touch detection can be cancelled according to the analog interference signal, and the touch detection sensitivity can be improved.

[0055] Figure 6 is a schematic diagram of a touch sub-chip provided by an embodiment of the present application. As Figure 6 shown, the touch sub-chip 201 includes a processing unit 2011 and a plurality of recognition units 2012. The plurality of recognition units 2012 are respectively electrically connected to a plurality of electrodes 401. Different recognition units 2012 are electrically connected to different electrodes 401. The recognition unit 2012 can receive the analog interference signal and the induction signal generated by the connected electrode 401, and generate a recognition signal according to the induction signal and the analog interference signal. The processing unit 2011 can perform touch detection according to the recognition signals generated by at least some of the plurality of recognition units 2012.

[0056] The touch sub-chip 201 includes a processing unit 2011 and a plurality of recognition units 2012. The plurality of recognition units 2012 are electrically connected to the processing unit 2011 respectively, and the plurality of recognition units 2012 are electrically connected to a plurality of electrodes 401 respectively. Different recognition units 2012 are electrically connected to different electrodes 401. When a finger touches, the electrodes 401 in the finger touch area generate induction signals in a self-capacitance or mutual-capacitance manner. The recognition unit 2012 corresponding to the electrode 401 receives the induction signal generated by the electrode 401. At the same time, the recognition unit 2012 receives the analog interference signal sent by the noise simulation unit 202, and performs touch detection based on the induction signal and the analog interference signal. In one example, when the touch sub-chip 201 performs touch detection, it performs touch detection based on the common-mode voltage of the induction signal and the drive signal. When the touch sub-chip 201 receives the analog interference signal, it performs touch detection based on the induction signal, the analog interference signal, and the common-mode voltage. Optionally, the touch sub-chip 201 performs touch detection based on the induction signal and the superimposed signal of the analog interference signal and the common-mode voltage. Thus, the interference signal coupled from the display signal to the cathode plate and then coupled from the cathode plate to the electrode 401 can be cancelled by the analog interference signal.

[0057] The processing unit 2011 in the touch sub-chip 201 can be a processing unit with processing capabilities, such as: a microcontroller unit (MCU), etc. The processing unit 2011 receives the induction signal sent by the recognition unit 2012 and performs touch detection according to the induction signal.

[0058] In the embodiment of the present application, the touch sub-chip 201 includes a processing unit 2011 and a plurality of recognition units 2012. The recognition unit 2012 can receive the induction signal and the analog interference signal generated by the connected electrode 401, and generate a recognition signal according to the analog interference signal and the induction signal. The processing unit 2011 can perform touch detection according to the recognition signals generated by the respective recognition units 2012, realizing touch detection through the self-capacitance or mutual-capacitance of the electrode 401. Since the recognition unit 2012 generates a recognition signal according to the analog interference signal and the induction signal, the signal interference generated by the display signal on the touch detection can be cancelled by the analog interference signal, the signal-to-noise ratio in the recognition signal can be improved, and the touch detection sensitivity can be improved.

[0059] Figure 7 is a schematic diagram of a recognition unit provided by an embodiment of the present application, as Figure 7As shown, the recognition 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.

[0060] The first end of the sixth resistor R6 is electrically connected to the output terminal of the noise simulation unit 202, and the second end of the sixth resistor R6 is electrically connected to the positive input terminal of the operational amplifier D1. Through the sixth resistor R6, the analog interference signal output by the noise simulation unit 202 can be input into the operational amplifier D1. Moreover, the first end of the seventh resistor R7 is electrically connected to the positive input terminal of the operational amplifier D1, and the second end of the seventh resistor R7 receives the common-mode voltage VCMI. Therefore, the common-mode voltage VCMI can be input into the positive input terminal of the operational amplifier D1, and the signal input into the positive input terminal of the operational amplifier D1 is the superimposed signal of the common-mode voltage VCMI and the analog interference signal.

[0061] The fifth resistor R5 can serve as the feedback resistor of the operational amplifier D1. Through the feedback resistor (the fifth resistor R5), the third capacitor C3, and the operational amplifier D1, a transimpedance amplifier circuit can be formed. 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. Through the transimpedance amplifier circuit, the induced signal (current signal) generated by the electrode 401 can be converted into a recognition signal (voltage signal). Moreover, since the signal input into the positive input terminal of the operational amplifier D1 is the superimposed signal of the common-mode voltage VCMI and the analog interference signal, during the process of converting the induced signal (current signal) generated by the electrode 401 into a recognition signal (voltage signal), the operational amplifier D1 can cancel out the signal interference between the analog interference signal received at the positive input terminal and the induced signal transmitted by the electrode 401.

[0062] In the embodiment of the present application, the fifth resistor R5 can serve as the feedback resistor of the operational amplifier D1. Through the feedback resistor (the fifth resistor R5), the third capacitor C3, and the operational amplifier D1, a transimpedance amplifier circuit can be formed. Through the transimpedance amplifier circuit, the induction signal (current signal) generated by the electrode 401 can be converted into an identification signal (voltage signal), realizing the conversion of the signal. Moreover, the positive input terminal of the operational amplifier D1 receives the superimposed signal of the analog interference signal and the common-mode signal, and the signal interference coupled to the cathode plate and then to the electrode 401 can be cancelled, which can improve the sensitivity of touch detection.

[0063] Figure 8 It is a schematic diagram of an identification unit including an amplification unit provided by an embodiment of the present application, as Figure 8 shown, the identification unit 2012 further includes: a first amplification unit D2. The input terminals of the first amplification unit D2 are respectively connected to the second end of the second capacitor C2 and the first end of the second resistor R2. The output terminal of the first amplification unit D2 is connected to the first end of the sixth resistor R6. The first amplification unit D2 can receive the analog interference signal and perform amplification processing on the analog interference signal, so that the identification unit 2012 performs touch detection based on the induction signal and the amplified analog interference signal.

[0064] In the embodiment of the present application, a first amplification unit D2 can also be provided in the identification unit 2012. The input terminal of the first amplification unit D2 is connected to the output terminal of the noise simulation unit 202, and the output terminal of the first amplification unit D2 is connected to the first end of the sixth resistor R6. The first amplification unit D2 can perform amplification processing on the analog interference signal output by the noise simulation unit 202, which can prevent the touch sub-chip 201 from being unable to perform touch detection according to the analog interference signal due to the low signal strength of the analog interference signal, resulting in the inability to cancel the signal interference in the electrode 401, so that the identification unit 2012 can cancel the signal interference generated by the display signal on the touch detection according to the amplified analog interference signal, which can improve the signal-to-noise ratio in the identification signal and improve the touch detection sensitivity.

[0065] In a possible implementation manner, 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 units 2012 corresponding to at least some adjacent electrodes 401 is different.

[0066] 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 row by row, that is, drives a row of display pixels 402 to emit light simultaneously, and then drives the next row of display pixels 402 to emit light. When driving a row of display pixels 402 simultaneously, 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 signals output by the display sub-chip 203 at the same time. However, compared with the display pixels 402 closer to the display sub-chip 203, the driving lines of the display pixels 402 farther from the display sub-chip 203 are longer, and the line loss is greater. So, in the direction from the display sub-chip 203 from near to far, the closer the display pixel 402 is to the display sub-chip 203, the greater the signal intensity of the display signal received by the display pixel 402, and the stronger the signal interference caused. Since the electrodes 401 include multiple horizontal electrodes and multiple vertical electrodes, and the vertical electrodes are arranged perpendicular to the rows of the display pixels 402, the signal interference of the vertical electrodes closer to the position of the display sub-chip 203 is stronger, and the signal interference of the vertical electrodes farther from the position of the display sub-chip 203 is weaker. By setting 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 to be different, different vertical electrodes receive analog interference signals with different intensities. For the horizontal electrodes, due to the superposition effect of the cathode plate, the signal interference received by some horizontal electrodes is different. Similarly, by setting 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 to be different, different horizontal electrodes receive analog interference signals with different intensities.

[0067] 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 recognition unit 2012 corresponding to at least some adjacent electrodes 401 is different, that is, there may be cases where 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 recognition unit 2012 corresponding to some electrodes 401 are all the same.

[0068] In an embodiment of the present application, 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 recognition unit 2012 corresponding to at least some adjacent electrodes 401 is different, so that the intensities of the analog interference signals received by at least some of the electrodes 401 are different. The signal intensity 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 generated by the display signal on the electrode 401 during actual application, and can improve the cancellation effect of canceling the signal interference generated by the display signal on the touch detection through the analog interference signal, thereby improving the touch detection sensitivity.

[0069] Figure 9 It is a schematic diagram of a noise simulation unit including an amplification unit provided by an embodiment of the present application. As Figure 9 shown, the noise simulation unit 202 further includes: a second amplification unit D3. The input end of the second amplification 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 amplification unit D3 is respectively connected to the first end of the sixth resistor R6 in each recognition unit 2012. The second amplification unit D3 can amplify the signal passing through the second capacitor C2 to obtain an analog interference signal.

[0070] The noise simulation unit 202 may include a second amplification unit D3. Compared with the solution of setting the first amplification unit D2 in the previous embodiment, the second amplification unit D3 is not set in the recognition unit 2012, but is separately set in the noise simulation unit 202. Since the output end of the second amplification unit D3 is respectively connected to the first end of the sixth resistor R6 of each recognition unit 2012, only one second amplification unit D3 can be set in the touch display chip 200. Compared with the solution of setting the first amplification unit D2 in each recognition unit 2012 in the touch sub-chip 201 in the previous embodiment, the cost can be reduced.

[0071] In an embodiment of the present application, the noise simulation unit 202 further includes a second amplification unit D3. The second amplification unit D3 can amplify the signal passing through the second capacitor C2 to obtain an analog interference signal with a higher signal intensity, which can prevent the touch sub-chip 201 from being unable to perform touch detection according to the analog interference signal due to the low signal intensity of the analog interference signal, resulting in the inability to cancel the signal interference in the electrode 401. Compared with the solution of setting the first amplification unit D2 in the recognition unit 2012 in the previous embodiment, only one amplification unit can be set in the touch display chip 200, reducing the cost of the touch display chip 200.

[0072] In a possible implementation manner, at least one of the resistance value of the sixth resistor R6 and the resistance value of the seventh resistor R7 in the recognition unit 2012 corresponding to at least some adjacent electrodes 401 is different.

[0073] Similar to the principle described in the foregoing embodiments, the longitudinal electrodes near the position where the display sub-chip 203 is located are subject to stronger signal interference, and the longitudinal electrodes far from the position where the display sub-chip 203 is located are subject to weaker signal interference. For the transverse electrodes, due to the superposition effect of the cathode plate, the signal interference received by some of the transverse electrodes is different. Since there is only one second amplification unit D3 in the noise simulation unit 202, by setting at least one of the resistance values of the sixth resistor R6 and the seventh resistor R7 to be different, at least some adjacent longitudinal electrodes can receive analog interference signals of different intensities, and at least some adjacent transverse electrodes can receive analog interference signals of different intensities.

[0074] It should be noted that since the signal interference received by adjacent transverse electrodes or longitudinal electrodes may be the same, at least one of the resistance values of the sixth resistor R6 and the seventh resistor R7 in the recognition unit 2012 corresponding to at least some adjacent electrodes 401 is different, that is, there may be cases where the resistance values of the sixth resistor R6 and the seventh resistor R7 in the recognition unit 2012 corresponding to some of the electrodes 401 are the same.

[0075] In the embodiment of the present application, at least one of the resistance values of the sixth resistor R6 and the seventh resistor R7 in the recognition unit 2012 corresponding to at least some adjacent electrodes 401 is different, which can make the intensities of the analog interference signals received by at least some of the electrodes 401 different. The signal intensity 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 generated by the display signal on the electrode 401 during actual application, and can improve the cancellation effect of canceling the signal interference generated by the display signal on the touch detection by the analog interference signal, thereby improving the touch detection sensitivity.

[0076] In a possible implementation manner, the touch sub-chip 201 can perform touch detection based on the induction signal and the analog interference signal when the display sub-chip 203 outputs a reference signal, and perform touch detection based on the induction signal when the display sub-chip 203 stops outputting the reference signal.

[0077] It should be understood that there are some application scenarios where the display sub-chip 203 does not output a display signal to drive the display pixel 402, but touch detection needs to be performed. For example, when the electronic device is a mobile phone, when the mobile phone screen is black, the display sub-chip 203 does not output a display signal to drive the display pixel 402, but at this time, the touch sub-chip 201 outputs a drive signal to the electrode 401 to perform touch detection. Or 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 induction 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 induction signal generated by the electrode 401.

[0078] In the embodiment of the present application, the touch sub-chip 201 can perform touch detection based on the induction signal and the simulated interference signal when the display sub-chip 203 sends a reference signal, and perform touch detection based on the induction signal when the display sub-chip 203 stops sending the reference signal. Thus, it is applicable to the scenario where the display chip does not output a display signal for touch detection, and the user can choose whether to perform touch detection according to the simulated interference signal. The user can freely choose between low-power touch detection (not generating a simulated interference signal and not performing touch detection according to the simulated interference signal) and high-sensitivity touch detection (generating a simulated interference signal and performing touch detection according to the simulated interference signal), and the user has a high degree of freedom.

[0079] Figure 10 It is a schematic diagram of an identification unit including a switch provided by an embodiment of the present application, as Figure 10 shown, the identification unit 2012 further 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. 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.

[0080] In the 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. When the display sub-chip 203 sends a reference signal, touch detection is performed based on the induction signal and the analog interference signal, and when the display sub-chip 203 stops sending the reference signal, touch detection is performed based on the induction signal. The user can freely choose between low-power touch detection (without generating an analog interference signal and not performing touch detection based on the analog interference signal) and high-sensitivity touch detection (generating an analog interference signal and performing touch detection based on the analog interference signal), and the user has a high degree of freedom.

[0081] The embodiment of the present application further provides a display chip, which is applied to an electronic device. The display chip can send a display signal to multiple display pixels to make the display pixels emit light, and send a reference signal to a noise simulation unit to make the noise simulation unit generate an analog interference signal according to the reference signal, and make the touch chip perform touch detection according to the induction signal and the analog interference signal generated by the electrode. Among them, 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 on touch detection.

[0082] In the embodiment of the present application, the display chip can be the display sub-chip 203 in any of the foregoing embodiments. For the specific structure and interaction of the display chip, reference can be made to the description of the display sub-chip 203 in any of the foregoing embodiments, which will not be elaborated herein.

[0083] The embodiment of the present application further provides a touch chip, which is applied to an electronic device. The touch chip can output a driving signal to an electrode and perform touch detection according to the induction signal and the analog interference signal generated by the electrode. Among them, 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 on touch detection, and the analog interference signal is generated by the noise simulation unit according to the reference signal, and the display signal and the reference signal are output by the display chip.

[0084] In the embodiment of the present application, the touch chip can be the touch sub-chip 201 in any of the foregoing embodiments. For the specific structure and interaction of the touch chip, reference can be made to the description of the touch sub-chip 201 in any of the foregoing embodiments, which will not be elaborated herein.

[0085] Figure 11 is a schematic diagram of a touch display system provided by the embodiment of the present application, as Figure 11 shown, the touch display system 300 includes a noise simulation unit, the display chip in any of the foregoing embodiments, and the touch chip in any of the foregoing embodiments.

[0086] In the embodiments of the present application, the touch chip may be the touch sub-chip 201 in any of the foregoing embodiments, the noise simulation unit may be the noise simulation unit 202 in any of the foregoing embodiments, and the display chip may be the display sub-chip 203 in any of the foregoing embodiments. For the specific structures and interactions of the touch chip, the display chip, and the noise simulation unit, reference may be made to the descriptions of the touch sub-chip 201, the noise simulation unit 202, and the display sub-chip 203 in any of the foregoing embodiments, which will not be elaborated herein. It should be noted that the difference between the touch display system 300 and the foregoing touch display chip 200 is that the touch chip, the display chip, and the noise simulation unit in this system can be independently set, rather than being encapsulated in the same chip in the touch display chip 200 solution.

[0087] The embodiments of the present application further provide 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 foregoing embodiments.

[0088] The embodiments of the present application further provide an electronic device, including the display screen in the foregoing embodiments.

[0089] It should be noted that, according to the needs of implementation, each component / step 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 the components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present application.

[0090] Those of ordinary skill in the art can realize that the units and method steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiments of the present application.

[0091] The above embodiments are only used to illustrate the embodiments of the present application, rather than to limit the embodiments of the present application. Those of ordinary skill 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 belong to the scope of the embodiments of the present application. The patent protection scope of the embodiments of the present application shall be defined by the claims.

Claims

1. A touch display chip, applied to 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 control 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 control sub-chip and the display sub-chip respectively; The display sub-chip is used to send display signals to the plurality of display pixels to make the display pixels emit light, and to send reference signals to the noise simulation unit; The noise simulation unit is used to generate a simulated interference signal according to the reference signal, wherein the simulated 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 control sub-chip is used to output a driving signal to the electrode, and perform touch control detection according to the sensing signal generated by the electrode and the analog interference signal.

2. The touch display chip according to claim 1, characterized in that: 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; or, 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, characterized in that: The display sub-chip comprises: 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 used 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.

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

5. The touch display chip according to claim 3, characterized in that: 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 control 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.

6. The touch display chip according to claim 5, characterized in that: The touch control sub-chip includes a processing unit and a plurality of identification units; The multiple recognition units are electrically connected to the multiple electrodes respectively, and different recognition units are electrically connected to different electrodes; The identification unit is used 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 used to perform touch detection according to the recognition signals generated by at least some of the recognition units.

7. The touch display chip according to claim 6, 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.

8. The touch display chip according to claim 7, 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 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.

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

10. The touch display chip according to claim 7, characterized in that: The noise simulation unit further includes: a second amplification 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 analog interference signal.

11. The touch display chip according to claim 10, 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.

12. The touch display chip according to claim 7, 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.

13. The touch display chip according to claim 12, characterized in that: 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.

14. A display chip, applied to electronic equipment, characterized in that: The display chip is used to 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.

15. A touch chip, applied to 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 the 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.

16. A touch display system, characterized in that: The invention comprises a noise simulation unit, a display chip as claimed in claim 14 and a touch control chip as claimed in claim 15.

17. A display screen, characterized in that: It comprises a plurality of electrodes, a plurality of display pixels and a touch display chip as described in any one of claims 1 to 13 or a touch display system as described in claim 16.

18. An electronic device, characterized in that: Comprising the display screen as claimed in claim 17.

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