Touch display chip and electronic device

Abstract

Embodiments of the present application provide a touch display chip and an electronic device. The touch display chip comprises: a touch driving signal generation circuit configured to generate a touch driving signal for a touch sensor; a touch signal processing circuit configured to sample and process a touch sensing signal generated by the touch sensor; a detection circuit configured to detect a pixel update interval and a display interference interval of a display screen, wherein the pixel update interval is a time interval during which a pixel circuit of the display screen receives a pixel driving signal, and the display interference interval is a time interval during which the pixel driving signal interferes with the touch sensor; and a control circuit configured to control the touch driving signal generation circuit to generate the touch driving signal in a non-pixel update interval, and control the touch signal processing circuit to sample the touch sensing signal in a non-display interference interval. Embodiments of the present application can reduce mutual interference between display and touch, and improve display effect and touch performance.

Description

Technical Field

[0001] This application relates to the field of touch technology, specifically to a touch display chip and electronic device. Background Technology

[0002] With the development of display technology based on Active Matrix Organic Light Emitting Diode (AMOLED) panels, the distance between the sensing electrodes in touch sensors and the display cathode in the screen is getting closer and closer. The amplitude of the touch driving signal coupled to the display cathode is also increasing. This signal can then couple to the display's data line through the display cathode, forming a crosstalk coupling path. Thus, on the one hand, once there is a driving signal output on the touch sensing electrode, the display will be interfered with, displaying an interference pattern similar to water ripples. On the other hand, when the display refreshes its screen, it generates significant display interference on the sensing electrodes. This display interference reduces the accuracy of touch detection results, and may even prevent touch operation recognition. Utility Model Content

[0003] In view of the above problems, this application provides a touch display chip and an electronic device to solve the above technical problems.

[0004] In a first aspect, embodiments of this application provide a touch display chip, comprising: a touch driving signal generating circuit connected to a touch sensor for generating a touch driving signal from the touch sensor; a touch signal processing circuit connected to the touch sensor for sampling and processing the touch sensing signal generated by the touch sensor; a detection circuit for detecting a pixel update interval and a display interference interval of the display screen, wherein the pixel update interval is the time interval during which the pixel circuit receives the pixel driving signal, and the display interference interval is the time interval during which the pixel driving signal interferes with the touch sensor; and a control circuit connected to the touch driving signal generating circuit, the touch signal processing circuit, and the detection circuit for controlling the touch driving signal generating circuit to generate a touch driving signal in a non-pixel update interval and controlling the touch signal processing circuit to sample the touch sensing signal in a non-display interference interval.

[0005] In some embodiments, the touch driving signal generating circuit includes: a signal generating unit for generating a touch driving signal; a first switch connected between the signal generating unit and the driving electrode of the touch sensor; wherein, a control circuit is configured to disconnect the first switch in a pixel update interval and turn on the first switch in a non-pixel update interval.

[0006] In some embodiments, the touch signal processing circuit includes an analog-to-digital converter for performing analog-to-digital conversion on the touch sensing signal; a second switch connected between the analog-to-digital converter and the sensing electrode of the touch sensor; and a control circuit for turning off the second switch in a display interference range and turning on the second switch in a non-display interference range.

[0007] In some embodiments, the touch signal processing circuit includes an analog-to-digital converter; wherein, the control circuit is further connected to the analog-to-digital converter for generating a sampling synchronization signal, wherein the sampling synchronization signal instructs the analog-to-digital converter to sample in a non-display interference range.

[0008] In some embodiments, the touch signal processing circuit further includes an amplifier connected between the sensing electrode and the analog-to-digital converter for amplifying the touch sensing signal; wherein, the second switch is connected between the amplifier and the sensing electrode, or between the amplifier and the analog-to-digital converter.

[0009] In some embodiments, the pixel update interval has a preset update duration, and the detection circuit is used to receive the display synchronization signal of the display and determine the start time of the pixel update interval based on the display synchronization signal, wherein the start time of the pixel update interval is the synchronization start time of the display synchronization signal or has a first preset phase difference with the synchronization start time.

[0010] In some embodiments, the display interference interval has a preset interference duration. The detection circuit is used to receive the display synchronization signal of the display and determine the start time of the display interference interval based on the display synchronization signal. The start time of the display interference interval is the synchronization start time of the display synchronization signal or has a second preset phase difference with the synchronization start time.

[0011] In some embodiments, the frequency of the touch drive signal is higher than or equal to the frequency of the display synchronization signal, or the touch drive signal is a spread spectrum signal.

[0012] In some embodiments, the frequency of the touch drive signal is between 50 kHz and 500 kHz.

[0013] Secondly, embodiments of this application also provide an electronic device, including a device body and the aforementioned touch display chip disposed on the device body.

[0014] The touch display chip and electronic device provided in this application embodiment have a touch drive signal generation circuit that generates touch drive signals in non-pixel update intervals and does not generate touch drive signals in pixel update intervals, which can reduce the interference of touch drive signals on the display and reduce the water ripples on the display; the touch signal processing circuit samples touch sensing signals in non-display interference intervals, which can reduce the interference of display drive signals on touch signals and improve touch performance.

[0015] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The circuit diagram shows the mutual interference between the touch circuit and the pixel circuit.

[0018] Figure 2 A schematic block diagram of a touch display chip provided in an embodiment of this application is shown.

[0019] Figure 3 A schematic diagram showing the timing relationship between the display synchronization signal and the pixel update interval and the display interference interval is shown.

[0020] Figure 4 A schematic block diagram of a touch display chip provided in an embodiment of this application is shown.

[0021] Figure 5 A timing diagram of the first control signal and the touch drive signal received by the drive electrode is shown.

[0022] Figure 6 A schematic diagram showing the timing of the second control signal, the sampling synchronization signal, and the signals received by the touch signal processing circuit is shown.

[0023] Figure 7 A schematic block diagram of a touch system according to a specific embodiment provided in this application is shown. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0027] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0029] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could be A, B, C, A and B, A and C, B and C, or A and B and C.

[0030] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. In addition, the character "", unless otherwise specified, generally indicates that the associated objects before and after it have an "or" relationship.

[0031] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0032] In the circuit structure provided by the embodiments of this application, nodes such as the first node and the second node do not represent actual existing components, but rather represent the junction points of related couplings in the circuit diagram. In other words, these nodes are equivalent to the junction points of related couplings in the circuit diagram.

[0033] The display screen includes a pixel circuit array composed of multiple pixel circuits, also known as pixel driver circuits. For a specific row of pixel circuits, the pixel update interval, or pixel update enable interval, of that row can be determined based on the display synchronization signal, thereby performing pixel updates. The display synchronization signal can specifically be a horizontal synchronization signal (HSYNC). It should be understood that the pixel update interval of a pixel circuit is the time interval during which the pixel driver signal from the data line is written to the pixel circuit. The horizontal synchronization signal, as the output signal of the display standard, inputs a pixel driver signal to a row of pixel circuits within each cycle of the horizontal synchronization signal to perform pixel updates. One or more segments of the horizontal synchronization signal can be considered as the pixel update interval, and the relationship between the horizontal synchronization signal and the pixel update interval is determined by the display's driving method and the control timing of the display module.

[0034] For displays, especially AMOLED displays, the closer proximity of the display and touchscreen makes the pixel update range of the pixel circuitry highly susceptible to interference from touch drive signals from the touchscreen. This pixel update range is therefore also known as the display sensitive range. If the touch drive signal flips within this pixel update range, the display will exhibit an interference pattern resembling ripples on water; hence, this range is also called the ripple sensitive range. Therefore, neglecting the display's pixel update range when generating touch drive signals will interfere with the display's pixel circuitry.

[0035] The following explains the principle of mutual interference between touch screen and display screen.

[0036] The bottom layer of the display screen is the display plate, which houses the aforementioned pixel circuit array. Above the display plate is the cathode plate, used to lead out the ground (GND) terminals of each pixel circuit on the display plate and to isolate the touch sensor from the display plate. Above the cathode plate is the touch sensor (TP sensor), on which touch electrodes are arranged in rows and columns. These touch electrodes may include driving electrodes (T... X ), sensing electrode (R) X ).like Figure 1As shown, the touch drive signal generation circuit detects touch by inputting touch drive signals to the drive electrodes on the touchpad, and the touch signal processing circuit detects the touch sensing signals of the sensing electrodes. The display module outputs pixel drive signals, which charge the energy storage capacitor C1 of the pixel drive circuit based on the display synchronization signal of the display screen to determine the display content. In a specific implementation, the touch drive signal generation circuit, the touch signal processing circuit, and the display module are integrated into a touch display chip, which controls the display screen and touch sensors to realize graphical user interface display and touch interaction.

[0037] As displays become thinner, the distance between the touch electrodes and the display cathode in the screen becomes closer, leading to increased interference between touch and display. On the one hand, reference... Figure 1 As shown, the pixel drive signal of the display module is coupled to the cathode plate via a data line and a capacitor Cd. A portion of the signal flows to the cathode power supply Elvss, and another portion is coupled to the sensing electrode of the touch sensor via a capacitor Ct. The touch signal processing circuit is affected by display interference during the detection of the touch sensing signal from the sensing electrode. On the other hand, reference... Figure 1 As shown, the touch drive signal generation circuit outputs a touch drive signal to the drive electrode. The fluctuations generated by the touch drive signal are coupled to the pixel circuit of the display panel through capacitors Ct and Cd in sequence. The signal fluctuations of the touch drive signal are coupled to the cathode plate through capacitor Ct, and signal fluctuations will be generated on the cathode plate. During the pixel update interval, the signal fluctuations generated on the cathode plate will be coupled to the pixel circuit of the display panel through capacitor Cd, so that the display screen will show an interference pattern similar to water ripples, affecting the display effect.

[0038] Therefore, this application provides a touch display chip that can both solve the display ripple problem and optimize the impact of display interference on touch functionality. Please refer to... Figure 2 As shown, the touch display chip 200 may include a touch drive signal generation circuit 210 and a touch signal processing circuit 220. The touch drive signal generation circuit 210 is connected to the touch sensor 100 and is used to generate touch drive signals for the touch sensor 100. Specifically, the touch drive signal generation circuit 210 is connected to the drive electrode 110 of the touch sensor 100. The touch signal processing circuit 220 is connected to the touch sensor 100 and is used to sample and process the touch sensing signals generated by the touch sensor. Specifically, the touch signal processing circuit 220 is connected to the sensing electrode 120 of the touch sensor 100.

[0039] Continue reading Figure 2As shown, the touch display chip 200 also includes a detection circuit 230 and a control circuit 240. The detection circuit 230 is used to detect the pixel update interval and display interference interval of the display screen. The pixel update interval is the time interval during which the pixel circuit of the display screen receives pixel driving signals, and the display interference interval is the time interval during which the pixel driving signals interfere with the touch sensor. In a specific implementation, the detection circuit 230 can receive the display synchronization signal of the display and determine the pixel update interval and display interference interval based on the display synchronization signal. The pixel update interval can have a preset update duration, and the start time of the pixel update interval can be the same as the synchronization start time or have a first preset phase difference. In some implementations, such as... Figure 3 As shown, the start time of the pixel update interval is basically consistent with the synchronization start time of the display synchronization signal. In other implementations, the start time of the pixel update interval may have a first preset phase difference with the synchronization start time, and this first preset phase difference is not zero. For example... Figure 3 As shown, the display interference interval has a preset interference duration T, and the start time of the display interference interval has a second preset phase difference with the synchronization start time, which is not zero. Alternatively, the start time of the display interference interval can be substantially the same as the synchronization start time (not shown in the figure), i.e., the second preset phase difference is zero. The duration of the display interference interval can be pre-tested, and the second preset phase difference between the start time of the display interference interval and the synchronization start time can be tested. Specifically, the signal on the sensing electrode 120 during the pixel circuit receiving the pixel drive signal can be detected. When the amplitude of this signal is greater than a threshold value, display interference is determined; when the amplitude of this signal is less than the threshold value, no display interference is determined. The duration of the display interference interval is determined based on the duration of the display interference, thus obtaining the preset interference duration. The aforementioned phase difference is determined based on the difference between the earliest time of the display interference and the synchronization start time of the display synchronization signal, thus obtaining the second preset phase difference.

[0040] Furthermore, the control circuit 240 is connected to the touch drive signal generation circuit 210, the touch signal processing circuit 220, and the detection circuit 230. It controls the touch drive signal generation circuit 210 to generate touch drive signals in non-pixel update intervals and not generate touch drive signals in pixel update intervals, thereby reducing interference from the touch drive signal to the display screen and minimizing screen ripples. The control circuit 240 also controls the touch signal processing circuit 220 to sample the touch sensing signal generated by the sensing electrode 120 in non-display interference intervals and not sample the touch sensing signal generated by the sensing electrode 120 in display interference intervals, thereby reducing interference from the display drive signal to the touch signal and improving touch performance.

[0041] Please see Figure 4As shown, in one embodiment, the touch driving signal generation circuit 210 may include a signal generation unit 211 and a first switch 212. The signal generation unit 211 is used to generate a touch driving signal. The first switch 212 is connected between the signal generation unit 211 and the driving electrode 110 of the touch sensor 100. The control circuit 240 is used to turn off the first switch 212 during the pixel update interval and turn on the first switch 212 during the non-pixel update interval. Specifically, during the period when the first switch 212 is off, the driving electrode 110 can remain at a low level; during the period when the first switch 212 is on, the driving electrode 110 can receive the touch driving signal generated by the signal generation unit 211. The control circuit 240 is connected to the control terminal of the first switch 212 and sends a first control signal to the control terminal of the first switch 212, such as... Figure 5 As shown, in the non-pixel update interval, the first control signal of the first switch 212 is high, the first switch 212 is turned on, and the driving electrode 110 receives the touch driving signal generated by the signal generation unit 211. In the pixel update interval, the first control signal of the first switch 212 is low, the first switch 212 is turned off, the touch driving signal generated by the signal generation unit 211 is not transmitted to the driving electrode 110, and the signal received by the driving electrode 110 can remain at a low level.

[0042] In some implementations, the frequency of the touch driving signal generated by the touch driving signal generation circuit 210 is equal to or higher than the frequency of the display synchronization signal. Preferably, the frequency of the touch driving signal is higher than the frequency of the display synchronization signal. The frequency of the touch driving signal can be between 50kHz and 500kHz, separating the spectrum of the touch driving signal from the spectrum of the display synchronization signal. When the touch signal processing circuit 220 samples and processes the touch sensing signal of the sensing electrode 120, it can demodulate only the signal at the frequency point without display interference harmonics, thereby improving the suppression capability of display interference while optimizing the water ripple effect. (See also...) Figure 5 As shown, the frequency of the touch drive signal a is higher than the frequency of the display synchronization signal. In some implementations, the touch drive signal generated by the touch drive signal generation circuit 210 is a spread spectrum signal. The spread spectrum signal can separate the spectrum of the touch drive signal from the spectrum of the display synchronization signal. See [reference needed]. Figure 5 As shown, the touch drive signal b is a spread spectrum signal, which is a sequence of pulse signals with different pulse widths in the time domain.

[0043] Please see Figure 4 As shown, in one embodiment, the touch signal processing circuit 220 may include an analog-to-digital converter 221. A control circuit 240 may be connected to the analog-to-digital converter 221. The control circuit 240 is used to generate a sampling synchronization signal, wherein the sampling synchronization signal instructs the analog-to-digital converter 221 to sample in the non-display interference range and not to sample in the display interference range. Specifically, as shown... Figure 6 As shown, the analog-to-digital converter 221 does not sample when the sampling synchronization signal is low, and samples when the sampling synchronization signal is high. The sampling synchronization signal remains low in the display interference range, therefore the analog-to-digital converter 221 does not sample in the display interference range, but samples according to the sampling interval in the non-display interference range. In the display interference range, the signal of the sensing electrode 120 is the superposition of the display interference signal and the touch sensing signal. In the non-display interference range, the signal of the sensing electrode 120 is the touch sensing signal. Compared with the display interference range, the signal amplitude in the non-display interference range is smaller. By sampling only in the non-display interference range, an analog-to-digital converter 221 with a smaller input voltage range can be used.

[0044] Please see Figure 4 As shown, in one embodiment, the touch signal processing circuit 220 may include an analog-to-digital converter (ADC) 221 and a second switch 222. The ADC 221 is used to perform analog-to-digital conversion on the touch sensing signal. The second switch 222 is connected between the ADC 221 and the sensing electrode 120 of the touch sensor 100. The control circuit 240 is used to disconnect the second switch 222 in the display interference range and connect the second switch 222 in the non-display interference range. When the second switch 222 is disconnected, the signal of the sensing electrode 120 is not transmitted to the ADC 221; when the second switch is connected, the signal of the sensing electrode 120 is transmitted to the ADC 221. In the display interference range, the signal of the sensing electrode 120 is a superposition of the display interference signal and the touch sensing signal. The second switch 222 is disconnected in the display interference range, and the display interference signal is not transmitted to the ADC 221. In the non-display interference range, the signal of the sensing electrode 120 is the touch sensing signal, which basically does not contain the display interference signal. The touch sensing signal with a high signal-to-noise ratio is transmitted to the ADC 221. Specifically, as shown... Figure 6 As shown, the second control signal of the second switch 222 is high in the non-display interference range and low in the display interference range.

[0045] In some implementations, please refer to Figure 4 As shown, the touch signal processing circuit 220 may include an analog-to-digital converter 221 and a second switch 222. The analog-to-digital converter 221 is used to perform analog-to-digital conversion on the touch sensing signal. The second switch 222 is connected between the analog-to-digital converter 221 and the sensing electrode 120 of the touch sensor 100. The control circuit 240 is used to turn off the second switch 222 in the display interference range, turn on the second switch 222 in the non-display interference range, and generate a sampling synchronization signal, wherein the sampling synchronization signal instructs the analog-to-digital converter 221 to sample in the non-display interference range and not sample in the display interference range. Specifically, as shown... Figure 6As shown, the second control signal of the second switch 222 is high in the non-display interference range and low in the display interference range. The sampling synchronization signal remains low in the display interference range, and defines a predetermined sampling interval in the non-display interference range.

[0046] In some embodiments, please refer to Figure 4 As shown, the touch signal processing circuit 220 may further include an amplifier 223. The amplifier 223 is connected between the sensing electrode 120 and the analog-to-digital converter 221, and is used to amplify the touch sensing signal generated by the sensing electrode 120. Further, the second switch 222 may be connected between the amplifier 223 and the sensing electrode 120, or between the amplifier 223 and the analog-to-digital converter 221. Specifically, the amplifier 223 may include an operational amplifier, etc. More specifically, the amplifier 223 may be a gain-adjustable operational amplifier. It should be understood that the touch signal processing circuit 220 may also include other signal conditioning circuits, such as filters, etc., which will not be elaborated upon in this embodiment.

[0047] In one implementation, the detection circuit 230 can generate a first indication signal for indicating a pixel update interval. Specifically, the detection circuit 230 can output a second level at the start time of detecting the pixel update interval and output a first level at the end time of detecting the pixel update interval. Specifically, it can output the second level when the synchronization start time of the display synchronization signal is detected, or after detecting that the synchronization start time is based on a first preset phase difference and delayed, and output the first level after a preset update duration of outputting the second level. Figure 3As shown, if a rising edge of the display synchronization signal is detected, the synchronization start time is detected. If entering a pixel update interval from a non-pixel update interval, the first indicator signal changes from a first level to a second level; if entering a non-pixel update interval from a pixel update interval, the first indicator signal changes from a second level to a first level. In some examples, the first level is low and the second level is high. In this case, when entering a pixel update interval from a non-pixel update interval, the first indicator signal shows a rising edge; when entering a non-pixel update interval from a pixel update interval, the first indicator signal shows a falling edge; within the pixel update interval, the first indicator signal remains high. In this example, if the first indicator signal shows a rising edge, it indicates entry into the pixel update interval; if the first indicator signal shows a falling edge, it indicates entry into the non-pixel update interval; if the first indicator signal is high, it indicates being within the pixel update interval. In other examples, the first level is high and the second level is low. In this case, when entering the pixel update region from a non-pixel update region, the first indication signal presents a falling edge; when entering the non-pixel update region from a pixel update region, the first indication signal presents a rising edge; within the pixel update region, the first indication signal remains low. In this example, if the first indication signal presents a falling edge, it indicates entry into the pixel update region; if the first indication signal presents a rising edge, it indicates entry into the non-pixel update region; if the first indication signal is low, it indicates being within the pixel update region. It should be understood that in this embodiment, the terms "high level" and "low level" distinguish the level state, not the actual high or low level value. The control circuit 240 can receive the first indication signal generated by the detection circuit 230 and generate a first control signal for the first switch 221 based on the first indication signal.

[0048] In one implementation, the detection circuit 230 can generate a second indication signal to indicate the display interference range. Specifically, the detection circuit 230 can output a second level when it detects the synchronization start time of the display synchronization signal, or after detecting the synchronization start time and delaying based on a second preset phase difference, and output a first level when a preset interference duration is reached. Figure 3As shown, if a rising edge of the display synchronization signal is detected, the synchronization start time is detected. If entering the display interference zone from the non-display interference zone, the second indicator signal changes from the first level to the second level; if entering the non-display interference zone from the display interference zone, the second indicator signal changes from the second level to the first level. In some examples, the first level is low and the second level is high. In this case, when entering the display interference zone from the non-display interference zone, the second indicator signal shows a rising edge; when entering the non-display interference zone from the display interference zone, the second indicator signal shows a falling edge; within the display interference zone, the second indicator signal remains high. In this example, if the second indicator signal shows a rising edge, it indicates entry into the display interference zone; if the second indicator signal shows a falling edge, it indicates entry into the non-display interference zone; if the second indicator signal is high, it indicates being within the display interference zone. In other examples, the first level is high and the second level is low. In this case, when entering the display interference zone from the non-display interference zone, the second indicator signal presents a falling edge; when entering the non-display interference zone from the display interference zone, the second indicator signal presents a rising edge; within the display interference zone, the second indicator signal remains low. In this example, if the second indicator signal presents a falling edge, it indicates entry into the display interference zone; if the second indicator signal presents a rising edge, it indicates entry into the non-display interference zone; if the second indicator signal is low, it indicates being within the display interference zone. It should be understood that in this embodiment, the terms "high level" and "low level" distinguish the level state, not the actual high or low level value. The control circuit 240 can receive the second indicator signal generated by the detection circuit 230, generate a second control signal for the second switch 222 based on the second indicator signal, and generate a sampling synchronization signal based on the cumulonimbus cloud second indicator signal.

[0049] In some implementations, the detection circuit 230 and the control circuit 240 can be implemented as a touch control module. For example... Figure 7 As shown, the first input / output (IO) pin IO_1 of the touch control module receives the display synchronization signal from the display; the second IO pin IO_2 outputs the first control signal of the first switch 221; the third IO pin IO_3 outputs the second control signal of the second switch 222; and the fourth IO pin IO_4 outputs the sampling synchronization signal of the analog-to-digital converter 221. Specifically, the touch control module can detect the pixel update interval and display interference interval of the display screen, control the touch drive signal generation circuit to generate a touch drive signal in the non-pixel update interval, and control the touch signal processing circuit to sample the touch sensing signal in the non-display interference interval. In a specific implementation, the touch control module can receive the display synchronization signal from the display and determine the pixel update interval and display interference interval based on the display synchronization signal. See the descriptions of the detection circuit 230 and control circuit 240 in this specification for details, which will not be repeated here.

[0050] In some embodiments, a touch screen is provided, which includes the touch display chip of the above embodiments. In a specific implementation, the touch screen may further include... Figure 1 The touch electrode shown includes a driving electrode and a sensing electrode. The sensing electrode is connected to the touch display chip and receives the touch driving signal described above. The touch display chip can also detect the touch sensing signal generated by the sensing electrode. The touch display chip may include, for example, […]. Figure 2 , Figure 4 The touch display chip 200 shown is shown.

[0051] In some embodiments, an electronic device is provided, including the touchscreen and touch display chip described above. Specifically, this electronic device may be, for example, a mobile phone, a tablet computer, a laptop computer, etc.

[0052] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A touch display chip, characterized in that, include: A touch drive signal generation circuit, connected to a touch sensor, is used to generate a touch drive signal for the touch sensor. A touch signal processing circuit, connected to the touch sensor, is used to sample and process the touch sensing signals generated by the touch sensor; A detection circuit is used to detect the pixel update interval and the display interference interval of the display screen, wherein the pixel update interval is the time interval during which the pixel circuit of the display screen receives the pixel driving signal, and the display interference interval is the time interval during which the pixel driving signal interferes with the touch sensor; A control circuit, connected to the touch drive signal generation circuit, the touch signal processing circuit, and the detection circuit, is used to control the touch drive signal generation circuit to generate the touch drive signal in the non-pixel update interval and to control the touch signal processing circuit to sample the touch sensing signal in the non-display interference interval. 2.The touch display chip of claim 1, wherein, The touch driving signal generation circuit includes: a signal generation unit for generating the touch driving signal; and a first switch connected between the signal generation unit and the driving electrode of the touch sensor. The control circuit is configured to disconnect the first switch during the pixel update interval and turn the first switch on outside the pixel update interval. 3.The touch display chip of claim 1, wherein, The touch signal processing circuit includes: an analog-to-digital converter for performing analog-to-digital conversion on the touch sensing signal; and a second switch connected between the analog-to-digital converter and the sensing electrode of the touch sensor. The control circuit is configured to disconnect the second switch in the display interference range and turn on the second switch in the non-display interference range. 4.The touch display chip of claim 1 or 3, wherein, The touch signal processing circuit includes an analog-to-digital converter; The control circuit is connected to the analog-to-digital converter and is used to generate a sampling synchronization signal, wherein the sampling synchronization signal instructs the analog-to-digital converter to sample in the non-display interference range.

5. The touch display chip as described in claim 3, characterized in that, The touch signal processing circuit further includes an amplifier connected between the sensing electrode and the analog-to-digital converter for amplifying the touch sensing signal; wherein the second switch is connected between the amplifier and the sensing electrode, or between the amplifier and the analog-to-digital converter. 6.The touch display chip of claim 1, wherein, The pixel update interval has a preset update duration. The detection circuit is used to receive the display synchronization signal of the display screen and determine the start time of the pixel update interval based on the display synchronization signal. The start time of the pixel update interval is the synchronization start time of the display synchronization signal or has a first preset phase difference with the synchronization start time. 7.The touch display chip of claim 1 or 6, wherein, The display interference interval has a preset interference duration. The detection circuit is used to receive the display synchronization signal of the display screen and determine the start time of the display interference interval based on the display synchronization signal. The start time of the display interference interval is the synchronization start time of the display synchronization signal or has a second preset phase difference with the synchronization start time. 8.The touch display chip of claim 6, wherein, The frequency of the touch driving signal is higher than or equal to the frequency of the display synchronization signal, or the touch driving signal is a spread spectrum signal. 9.The touch display chip of claim 8, wherein, The frequency of the touch driving signal is between 50 kHz and 500 kHz.

10. An electronic device, comprising: The device comprises a device body and a touch display chip as claimed in any one of claims 1-9 arranged on the device body.

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