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

Abstract

This disclosure provides a touch display chip, a touch chip, a touch display system, and an electronic device. The touch display chip is used for touch detection and display control of an AMOLED display screen. At least some of the display pixels in the AMOLED display screen are divided into multiple display pixel groups, and the cathodes of multiple display pixels within the same display pixel group are electrically connected. The touch display chip includes: a display sub-chip and a touch sub-chip; the display sub-chip is configured to be electrically connected to the display pixels; the touch sub-chip is configured to be electrically connected to the cathodes of the display pixels within the display pixel group; the display sub-chip is used to output display driving signals to some of the display pixels to cause the display pixels to emit light; the touch sub-chip is used to output touch driving signals to the cathodes of at least some of the non-illuminated display pixels within the display pixel group, and the touch driving signals are used for touch detection. This solution improves the manufacturing cost and efficiency of the display screen.

Description

Technical Field

[0001] This disclosure relates to the field of touch chip technology, and more particularly to a touch display chip, a touch chip, a touch display system, and an electronic device. Background Technology

[0002] Touch technology is a human-computer interaction method that allows users to interact with electronic devices by touching or gesturing on the touch area. With the development of smart devices, touch technology has become the mainstream operating method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations based on the touch commands.

[0003] Currently, the display screen in electronic devices includes a display pixel layer and an electrode layer. The display pixel layer and the electrode layer are respectively disposed on both sides of the cathode plate of the display screen. The touch chip of the electronic device performs touch detection based on the sensing signals generated by the electrodes, and the display chip sends display signals to the display pixels to drive the display pixels to display images.

[0004] However, the electrode layer includes a horizontal electrode layer and a vertical electrode layer. Setting horizontal and vertical electrode layers on the display screen increases process time and cost, resulting in lower manufacturing efficiency and higher manufacturing cost of the display screen. Utility Model Content

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

[0006] According to a first aspect of the present disclosure, a touch display chip is provided for touch detection and display control of an AMOLED display screen. The AMOLED display screen includes a plurality of display pixels, at least a portion of which are divided into a plurality of display pixel groups. Each display pixel group includes a plurality of display pixels, and the cathodes of the plurality of display pixels within the same display pixel group are electrically connected. The touch display chip includes a display sub-chip and a touch sub-chip. The display sub-chip is configured to be electrically connected to the plurality of display pixels. The touch sub-chip is configured to be electrically connected to the cathodes of the display pixels within the display pixel groups. The display sub-chip is configured to output display driving signals to a portion of the display pixels to cause the display pixels receiving the display driving signals to emit light. The touch sub-chip is configured to output touch driving signals to the cathodes of at least a portion of the non-emitting display pixels within the display pixel groups, the touch driving signals being used for touch detection.

[0007] In one possible implementation, the display pixel group includes display pixels located in multiple adjacent pixel rows, and the multiple display pixel groups are arranged in rows and columns to form a display pixel group array. Each row and each column of the display pixel group array includes multiple display pixel groups, and the row direction of the display pixel group array is the same as the pixel row direction of the AMOLED display screen. The touch sub-chip is used to output the touch driving signal to the cathode of the display pixels included in at least one row of non-light-emitting display pixel groups, and to receive the sensing signal output by the cathode of the display pixel, and to perform touch detection based on the sensing signal.

[0008] In one possible implementation, the display pixel group includes display pixels located in adjacent pixel rows, and the width of the display pixel group along the pixel row direction is equal to the width of the pixel row of the AMOLED display screen; the plurality of display pixel groups are arranged sequentially along the pixel column direction of the AMOLED display screen; the touch sub-chip is electrically connected to a plurality of electrodes disposed on the AMOLED display screen, and the electrodes are parallel to the pixel column direction of the AMOLED display screen; the touch sub-chip is used to output the touch driving signal to one of the non-illuminated display pixel group and the plurality of electrodes, and to receive a sensing signal output by the other of the non-illuminated display pixel group and the plurality of electrodes, and to perform touch detection based on the sensing signal; or, at least one of the non-illuminated display pixel group and the plurality of electrodes serves as both a driving electrode and a receiving electrode, the touch sub-chip outputs the touch driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode, and to perform touch detection based on the sensing signal.

[0009] In one possible implementation, the touch sub-chip is configured to output the touch driving signal to the cathode of the display pixels included in the display pixel group when the display pixel group is not emitting light and the pixel row adjacent to the display pixel group is not emitting light.

[0010] In one possible implementation, the touch sub-chip is configured to receive a reference signal output from at least one row of reference display pixel groups, and to perform touch detection based on the reference signal and the sensing signal, wherein the reference display pixel group is the display pixel group that is not emitting light and has not received the touch driving signal, and the reference signal is used to indicate the deviation of the sensing signal caused by the display driving signal being coupled to the cathode of the display pixel.

[0011] In one possible implementation, the touch display chip further includes: a noise simulation unit; the noise simulation unit is electrically connected to both the touch sub-chip and the display sub-chip; the display sub-chip is configured to send an interference reference signal to the noise simulation unit based on display data; the noise simulation unit is configured to generate a simulated interference signal based on the interference reference signal and send the simulated interference signal to the touch sub-chip, the simulated interference signal being used to simulate the interference signal generated by the display driving signal coupled to the cathode of the display pixel on touch detection; the touch sub-chip is configured to perform touch detection based on the sensing signal and the simulated interference signal.

[0012] In one possible implementation, the display sub-chip is configured to send a control signal to the display pixels included in the display pixel group when the display pixel group is not emitting light, and before or after the touch sub-chip transmits the touch driving signal to the cathode of the display pixels included in the display pixel group, the control signal being used to perform some or all of the following on the display pixels: reset, voltage input, and voltage threshold detection.

[0013] In one possible implementation, the display sub-chip includes multiple light-emitting control units, each of which is connected to multiple adjacent pixel rows in the AMOLED display screen, and different light-emitting control units are electrically connected to different pixel rows; the display pixel group includes display pixels electrically connected to the multiple light-emitting control units; the multiple light-emitting control units electrically connected to the display pixels included in the same display pixel group sequentially output the display driving signal to the electrically connected pixel rows.

[0014] According to a second aspect of the present disclosure, a touch chip is provided for touch detection of an AMOLED display screen, the AMOLED display screen including a plurality of display pixels, at least a portion of the plurality of display pixels being divided into a plurality of display pixel groups, each display pixel group including a plurality of display pixels, and the cathodes of the plurality of display pixels included in the same display pixel group being electrically connected; the touch chip is configured to be electrically connected to the cathodes of the display pixels included in the display pixel groups; the touch chip is configured to output touch driving signals to the cathodes of at least a portion of the non-light-emitting display pixels included in the display pixel groups, the touch driving signals being used for touch detection.

[0015] In one possible implementation, the display pixel group includes display pixels located in multiple adjacent pixel rows, and the multiple display pixel groups are arranged in rows and columns to form a display pixel group array. Each row and each column of the display pixel group array includes multiple display pixel groups, and the row direction of the display pixel group array is the same as the pixel row direction of the AMOLED display screen. The touch chip is used to output the touch driving signal to the cathode of at least one row of non-light-emitting display pixel groups, and to receive the sensing signal output by the cathode of the display pixel, and to perform touch detection based on the sensing signal.

[0016] In one possible implementation, the display pixel group includes display pixels located in adjacent pixel rows, and the width of the display pixel group along the pixel row direction is equal to the width of the pixel row of the AMOLED display screen; the plurality of display pixel groups are arranged sequentially along the pixel column direction of the AMOLED display screen; the touch chip is electrically connected to a plurality of electrodes disposed on the AMOLED display screen, and the electrodes are parallel to the pixel column direction of the AMOLED display screen; the touch chip is used to output the touch driving signal to one of the non-illuminated display pixel group and the plurality of electrodes, and to receive a sensing signal output by the other of the non-illuminated display pixel group and the plurality of electrodes, and to perform touch detection based on the sensing signal; or, at least one of the non-illuminated display pixel group and the plurality of electrodes serves as both a driving electrode and a receiving electrode, the touch chip outputs the driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode, and to perform touch detection based on the sensing signal.

[0017] In one possible implementation, the touch chip is configured to output the touch driving signal to the cathode of the display pixels included in the display pixel group when the display pixel group is not emitting light and the pixel row adjacent to the display pixel group is not emitting light.

[0018] In one possible implementation, the touch chip is configured to receive a reference signal output from at least one row of reference display pixel groups, and to perform touch detection based on the reference signal and the sensing signal, wherein the reference display pixel group is the display pixel group that is not emitting light and has not received the touch driving signal, and the reference signal is used to indicate the deviation of the sensing signal caused by the display driving signal output by the display chip being coupled to the cathode of the display pixel.

[0019] In one possible implementation, the touch chip is configured to receive a simulated interference signal from a noise simulation unit and perform touch detection based on the sensing signal and the simulated interference signal. The simulated interference signal is generated by the noise simulation unit based on a reference signal, which is generated by the display chip based on display data. The simulated interference signal is used to simulate the interference signal generated by the display driving signal output by the display chip coupled to the cathode of the display pixel and affecting touch detection.

[0020] According to a third aspect of the present disclosure, a touch display system is provided, comprising: a display chip and a touch chip as described in the second aspect above; the display chip is configured to be electrically connected to an AMOLED display screen including a plurality of display pixels; the display chip is configured to output a display driving signal to a portion of the display pixels to cause the display pixels receiving the display driving signal to emit light.

[0021] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising: a touch display chip as described in the first aspect above or a touch display system as described in the third aspect above, and an AMOLED display screen; the AMOLED display screen includes a plurality of display pixels, at least a portion of the plurality of display pixels are divided into a plurality of display pixel groups, each display pixel group includes a plurality of display pixels, and the cathodes of the plurality of display pixels included in the same display pixel group are electrically connected.

[0022] According to the solution provided in this disclosure, the AMOLED display screen includes display pixels divided into multiple display pixel groups. The cathodes of multiple display pixels within the same display pixel group are electrically connected. The touch display chip includes a display sub-chip and a touch sub-chip. The display sub-chip can output display driving signals to the display pixels to make them emit light. The touch sub-chip can output touch driving signals to the cathodes of the display pixels in the non-emitting display pixel groups for touch detection. Since the touch sub-chip can reuse the cathodes of the display pixels as electrodes for touch detection, there is no need to separately set electrodes for touch detection, or only need to set electrodes in one direction. This reduces the time and cost spent on setting electrodes, thereby improving the manufacturing efficiency of the AMOLED display screen and reducing its manufacturing cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the display screen stacked structure in related technologies;

[0025] Figure 2 This is a schematic diagram of a touch display chip according to an embodiment of the present disclosure;

[0026] Figure 3 This is a schematic diagram of a display pixel group according to an embodiment of the present disclosure;

[0027] Figure 4 This is a schematic diagram of black stripes according to an embodiment of this disclosure;

[0028] Figure 5 This is a schematic diagram of a display pixel group according to another embodiment of the present disclosure;

[0029] Figure 6 This is a schematic diagram of a display noise compensation scheme according to an embodiment of the present disclosure;

[0030] Figure 7 This is a schematic diagram of a touch display chip according to another embodiment of the present disclosure;

[0031] Figure 8 This is a schematic diagram of a noise simulation unit according to an embodiment of the present disclosure;

[0032] Figure 9 This is a timing diagram of display pixel group control according to an embodiment of the present disclosure;

[0033] Figure 10 This is a timing diagram of display pixel group control according to another embodiment of this disclosure. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions in the embodiments of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art should fall within the protection scope of this disclosure.

[0035] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure 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.

[0036] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0037] As mentioned earlier, touch technology is a human-computer interaction method that allows users to interact with electronic devices by touching or gesturing on the touch area. With the development of smart devices, touch technology has become the mainstream operating method for mobile phones and other electronic devices. Mobile phones and other electronic devices receive touch commands input by users on the display screen and recognize the corresponding touch operations based on the touch commands.

[0038] The basic light-emitting unit of an Active Matrix Organic Light Emitting Diode (AMOLED) display screen is an organic light-emitting diode. When current passes through these organic materials, electrons and holes recombine, releasing photons and thus emitting light. Each pixel in an AMOLED display screen can emit light and be controlled independently. Due to its vibrant colors and excellent High Dynamic Range (HDR), AMOLED displays are widely used in smartphones, smartwatches, tablets, and laptops.

[0039] To achieve the connection between touch and display, current AMOLED displays include a display pixel layer and an electrode layer, which are respectively disposed on opposite sides of the cathode plate. In one example, Figure 1 A schematic diagram of the AMOLED display screen stacked structure in related technologies is shown. For example... Figure 1As shown, the AMOLED display screen, from top to bottom, consists of 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 diode (OLED) layer 106, a thin film transistor (TFT) layer 107, and a substrate 108. The substrate 108 serves as the backplane for carrying the TFTs, and its material can be glass, polyimide (PI), or polyethylene terephthalate (PET), etc. The metal cathode 105 is the cathode plate, and the OLED layer 106 is the display pixel layer. The touch chip of the electronic device performs touch detection based on the sensing signals generated by the electrodes, and the display chip sends display signals to the display pixels to drive the display pixels to display images.

[0040] The touch electrode layer 103 includes horizontal electrodes and vertical electrodes. In order to set the touch electrode layer 103 in an AMOLED display screen, a metal layer needs to be formed by physical vapor deposition (PVD) process and an insulating layer needs to be formed by chemical vapor deposition (CVD) process. In addition, the electrode patterns of the horizontal and vertical electrodes need to be formed by dry etching or photolithography process, which results in high manufacturing efficiency and manufacturing cost of AMOLED display screen. Moreover, the touch electrode layer 103 also affects the lifespan of TFT and OLED.

[0041] This disclosure provides a touch control solution for AMOLED display screens. The cathodes of multiple display pixels in the AMOLED display screen are electrically connected and used as electrodes for touch detection. Employing a time-division multiplexing principle, touch detection coding and sampling are performed when the display pixels are not emitting light. While ensuring normal display of the AMOLED display screen, the cathodes of the display pixels are reused as electrodes for touch detection, eliminating the need for separate electrodes for touch detection, or requiring only separate vertical electrodes. This reduces the time and cost associated with electrode setup, thereby improving the manufacturing efficiency and reducing the manufacturing cost of AMOLED display screens.

[0042] The touch display chip, touch chip, touch display system, and electronic device provided in the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0043] Figure 2A schematic diagram of a touch display chip 200 according to an embodiment of the present disclosure is shown. The touch display chip 200 is used for touch detection and display control of an AMOLED display screen. At least some of the display pixels in the AMOLED display screen are divided into multiple display pixel groups, each display pixel group includes multiple display pixels, and the cathodes of the multiple display pixels in the same display pixel group are electrically connected.

[0044] like Figure 2 As shown, the touch display chip 200 includes a display sub-chip 210 and a touch sub-chip 220. The display sub-chip 210 is configured to connect to a plurality of display pixels 32 included in the AMOLED display screen 30, and the touch sub-chip 220 is configured to be electrically connected to the cathodes of the display pixels 32 included in the display pixel group 31. The display sub-chip 210 can output display driving signals to some of the display pixels 32 to cause the display pixels 32 receiving the display driving signals to emit light. The touch sub-chip 220 can output touch driving signals to the cathodes of at least some of the non-illuminated display pixels 32 included in the display pixel group 31, and the touch driving signals are used for touch detection.

[0045] The display sub-chip 210 is electrically connected to multiple display pixels 32 of the AMOLED display screen 30 via driving circuitry. The display sub-chip 210 can send display driving signals to the multiple display pixels 32, thereby driving the multiple display pixels 32 to emit light. For example, the display sub-chip 210 can control the R pixel, G pixel, and B pixel among the multiple display pixels 32 to emit light, enabling the AMOLED display screen 30 to display the corresponding image.

[0046] The cathodes of the display pixels 32 included in the same display pixel group 31 are electrically connected to form electrodes for touch detection. Different display pixel groups 31 can form different electrodes. The touch sub-chip 220 is electrically connected to the cathodes of the display pixels 32 included in each display pixel group 31, that is, the touch sub-chip 220 is electrically connected to the electrodes formed by interconnecting the cathodes of multiple display pixels 32. Since the cathodes of the display pixels 32 included in the same display pixel group 31 are interconnected, the touch sub-chip 220 can achieve electrical connection with the cathodes of all display pixels 32 in the same display pixel group 31 by electrically connecting the cathode of a certain display pixel 32 in each display pixel group 31.

[0047] For ease of description, in subsequent embodiments, the electrode formed by the cathode interconnection of the display pixels 32 included in the same display pixel group 31 is defined as the first electrode. Each display pixel group 31 may constitute a first electrode, and different display pixel groups 31 may constitute different first electrodes.

[0048] The touch sub-chip 220 can output a touch driving signal to the first electrode (i.e., perform touch detection coding) and can also receive a sensing signal from the first electrode (i.e., perform touch detection sampling). When using a self-capacitive touch detection method, the touch sub-chip 220 can also receive the sensing signal from the first electrode and perform touch detection based on the sensing signal. When using a mutual-capacitive touch detection method, after the touch sub-chip 220 outputs a touch driving signal to the first electrode, the second electrode generates a corresponding sensing signal. The touch sub-chip 220 can receive the sensing signal from the second electrode, and it can also output a touch driving signal to the second electrode and receive the sensing signal generated by the first electrode. Therefore, the touch sub-chip 220 can perform touch detection based on the sensing signals from both the first and second electrodes.

[0049] A display pixel group comprises multiple adjacent display pixels. The division of the display pixel group satisfies the coding and sampling requirements of touch detection, enabling touch position detection. For example, the display pixels of an AMOLED display screen can be divided into an M-row × N-column display pixel group matrix, or multiple adjacent pixel rows of an AMOLED display screen can be divided into a display pixel group, with different display pixel groups comprising different pixel rows. This disclosure does not limit the method of dividing the display pixel group.

[0050] During the manufacturing process of AMOLED displays, the Charge Generation Layer (CGL) is horizontally cut, causing the cathodes of the display pixels (such as magnesium-silver alloy) to break. This means the cathodes of the sub-pixels are separated, and each display pixel can include two sub-pixels. Based on the division of the display pixel group, the cathodes of the display pixels located within the same group are electrically connected via metal wires. When connecting the cathodes of the display pixels via metal wires, multiple metal wires can be used to sequentially connect the cathodes of the display pixels within the same group, or metal wires can be used to electrically connect the cathodes of adjacent display pixels within the same group.

[0051] Since AMOLED displays use pulse width modulation (PWM) for dimming, during each light-emitting stage of the AMOLED display, a certain area of ​​the OLED in the AMOLED display is in a turned-off state, that is, some areas of the OLED do not emit light. The touch sub-chip 220 can output a touch driving signal to the first electrode corresponding to the display pixel group located in the non-light-emitting area, thereby realizing the reuse of the cathode of the display pixel as an electrode for touch detection without affecting the display of the AMOLED display.

[0052] In this embodiment, the AMOLED display screen includes display pixels divided into multiple display pixel groups. The cathodes of multiple display pixels within the same display pixel group are electrically connected. The touch display chip 200 includes a display sub-chip 210 and a touch sub-chip 220. The display sub-chip 210 can output display driving signals to the display pixels to make them emit light. The touch sub-chip 220 can output touch driving signals to the cathodes of the display pixels in the non-emitting display pixel groups for touch detection. Since the touch sub-chip 220 can reuse the cathodes of the display pixels as electrodes for touch detection, there is no need to separately set electrodes for touch detection, or only need to set electrodes in one direction. This reduces the time and cost spent on setting electrodes, thereby improving the manufacturing efficiency of the AMOLED display screen and reducing its manufacturing cost.

[0053] In one possible implementation, such as Figure 3 The schematic diagram of the display pixel group shown illustrates that the display pixels in the display pixel group 31 are located in multiple adjacent pixel rows. Multiple display pixel groups 31 are arranged in rows and columns to form a display pixel group array. Each row and each column of the display pixel group array includes multiple display pixel groups 31. The row direction of the display pixel group array is the same as the pixel row direction of the AMOLED display screen. It should be noted that... Figure 3 As a schematic diagram of a display pixel group array, a 5-row × 4-column display pixel group array is shown. In other embodiments, the display pixel group array may include more or fewer rows and / or columns.

[0054] In one example, an AMOLED display screen includes 2560 rows × 1440 columns of display pixels, and each display pixel group includes 80 rows × 60 columns of display pixels. Thus, the AMOLED display screen is divided into a 32-row × 24-column display pixel group array, meaning that each row of the display pixel group array includes 24 display pixel groups, and each column of the display pixel group array includes 32 display pixel groups.

[0055] It should be noted that in some embodiments, certain pixel rows of an AMOLED display screen may not participate in the division of the display pixel group array; that is, the display pixels included in certain pixel rows do not belong to any display pixel group. For example, the display pixels in rows 1 to 80 of an AMOLED display screen belong to the first row of 24 display pixel groups, the display pixels in rows 85 to 164 of an AMOLED display screen belong to the second row of 24 display pixel groups, while the display pixels in rows 81 to 84 of an AMOLED display screen do not belong to any display pixel group.

[0056] The touch sub-chip 220 can output touch driving signals to the cathodes of the display pixels included in at least one row of non-light-emitting display pixels, and receive sensing signals output from the cathodes of the display pixels, and then perform touch detection based on the received sensing signals, that is, achieve touch detection through self-capacitance.

[0057] In one example, such as Figure 3 As shown, when the four display pixel groups in the first row are not illuminated, the touch sub-chip 220 outputs touch driving signals to the cathodes of the display pixels included in the four display pixel groups in the first row, and receives sensing signals output from the cathodes of the display pixels included in the four display pixel groups in the first row. When the four display pixel groups in the second row are not illuminated, the touch sub-chip 220 outputs touch driving signals to the cathodes of the display pixels included in the four display pixel groups in the second row, and receives sensing signals output from the cathodes of the display pixels included in the four display pixel groups in the second row. And so on, the touch sub-chip 220 can output touch driving signals to the cathodes of the display pixels included in the unilluminated rows of display pixel groups, and receive sensing signals.

[0058] When an AMOLED display screen uses PWM dimming, it will have one or more black stripes. Each black stripe includes multiple adjacent pixel rows, and the display pixels reset by the black stripe are the non-illuminating pixels. To ensure that when the touch sub-chip 220 outputs a touch drive signal to the first electrode, the display pixels corresponding to the cathodes of the first electrode are not illuminating, the height of the black stripe along the pixel column direction of the AMOLED display screen is greater than or equal to the height of the display pixel group along the pixel column direction of the AMOLED display screen. That is, when the display pixel group is completely within the black stripe, the touch sub-chip 220 outputs a touch drive signal to the cathodes of the display pixels included in that display pixel group. It should be noted that when the AMOLED display screen refreshes, it scans the pixel rows according to the direction of the pixel rows.

[0059] In one example, the height of the display pixel group along the pixel column direction is 3-4mm, corresponding to 60-80 pixel rows, with a corresponding time of H*60-80, where H is the row scan time, corresponding to one synchronization cycle. Generally, H = 1 / FPS / (2800+dummy_line) ≈ 2.7us, where dummy_line is the number of virtual lines, and FPS is 120Hz. The available time for the touch sub-chip 220 to output touch drive signals to the cathodes of the display pixels included in the display pixel group within the black stripe area is 2.7*60-80 = 162-216us. If multiple black stripes are required on the AMOLED display screen at a certain moment, touch drive signals can be output to the cathodes of the display pixels included in the display pixel group within the multiple black stripes.

[0060] The black stripes on the AMOLED display screen scroll over time, meaning their position changes over time. When the black stripes reach a certain position, the touch sub-chip 220 outputs a touch drive signal to the cathodes of the display pixels within that black stripe's pixel group and receives a sensing signal. The touch sub-chip 220 follows the black stripe, outputting touch drive signals to the cathodes of the display pixels within a row of pixels within the black stripe and receiving sensing signals, completing one touch detection coding and sampling. Thus, after the black stripes scroll from the starting position to the ending position along the pixel column direction, the touch sub-chip 220 completes touch detection coding and sampling through all display pixel groups. Therefore, the touch sub-chip 220 can perform touch detection based on the sensing signals corresponding to each display pixel group.

[0061] like Figure 4 The schematic diagram of the black stripes shows that the sub-chip 210 includes multiple light-emitting control units, each of which controls the light emission of multiple adjacent pixel rows (e.g., 4, 8, 16, etc.). The light-emitting control unit controls the light emission of the pixel rows according to the PWM signal. When the PWM signal is high, the corresponding pixel row is controlled not to emit light; when the PWM signal is low, the corresponding pixel row is controlled to emit light based on the display drive signal.

[0062] like Figure 4 As shown, the AMOLED display screen includes four black stripes, which scroll sequentially from top to bottom over time. Figure 4 The left image shows the black stripe at its starting position, the middle image shows it at a position between the starting and ending positions, and the right image shows it at its ending position. The black stripe jumps from the ending position back to the starting position to begin the next cycle of scrolling. It should be noted that each of the four black stripes has its own starting and ending positions, and the area between these positions represents the scrolling range of the corresponding black stripe. The union of the scrolling ranges of the four black stripes represents the display area of ​​the entire AMOLED screen.

[0063] When the PWM signal is high, the touch sub-chip 220 outputs a touch driving signal to the cathode of the display pixels within the black stripe based on the touch driving signal, and receives a sensing signal. In other words, the touch sub-chip 220 performs touch detection coding and sampling on the first electrode within the black stripe. Since the AMOLED display screen has four black stripes at the same time, the touch sub-chip 220 can simultaneously perform touch detection coding and sampling on four rows of display pixels within the four black stripes.

[0064] Because the black stripes scroll at a high frequency and the touch sub-chip 220 performs coding and sampling in a short time, the touch sub-chip 220 can complete coding and sampling through all display pixel groups within the time of finger touch, thereby detecting the touch position based on the sensing signals received from each first electrode.

[0065] The touch position of a finger on an AMOLED display screen affects the sensing signals generated by each first electrode. This is the basic principle of touch detection using a self-capacitive method, which will not be elaborated further here. The display pixel groups are arranged in a row-column matrix. Different finger positions on the AMOLED display screen result in different sensing signals received from each first electrode. Therefore, the touch sub-chip 220 can determine the finger's touch position based on the sensing signals received from each first electrode using a corresponding algorithm.

[0066] In this embodiment, the display pixel groups are arranged in rows and columns to form a multi-row, multi-column display pixel group array. Each row of display pixel groups in the array scrolls and does not emit light. The touch sub-chip 220 outputs a touch driving signal to at least one row of non-illuminated display pixel groups and receives sensing signals from the cathodes of the display pixels included in the non-illuminated display pixel groups. Therefore, the touch sub-chip 220 can determine the touch position based on the sensing signals from the cathodes of each display pixel group, thus achieving touch detection based on a self-capacitive method. By implementing touch detection through a self-capacitive method, both coding and sampling during the touch detection process are achieved through the cathodes of the display pixels included in the display pixel group, eliminating the need for additional driving and receiving electrodes. This improves the manufacturing efficiency of AMOLED display screens and reduces their manufacturing costs.

[0067] In one possible implementation, such as Figure 5 The schematic diagram of the display pixel group shows that the display pixels of the display pixel group 31 are located in multiple adjacent pixel rows, and the width of the display pixel group 31 along the pixel row direction of the AMOLED display screen 30 is equal to the width of the pixel row, that is, multiple adjacent pixel rows are divided into one display pixel group 31. Multiple display pixel groups 31 are arranged sequentially along the pixel column direction of the AMOLED display screen 30, that is, the display pixels of the AMOLED display screen 30 are divided into multiple display pixel groups 31 along the pixel column direction. Each display pixel group 31 includes multiple adjacent pixel rows, and different display pixel groups 31 do not include shared pixel rows.

[0068] The AMOLED display screen 30 has multiple electrodes 33. For ease of description and understanding, these electrodes 33 on the AMOLED display screen are defined as the second electrode. The second electrode is parallel to the pixel column direction of the AMOLED display screen. The cathodes of the display pixels included in the display pixel group 31 are interconnected to form the first electrode. The first electrode is a strip-shaped structure parallel to the pixel row direction, so the first electrode and the second electrode are perpendicular to each other.

[0069] In one example, the second electrode can be disposed on the thin film encapsulation (TFE) layer of the AMOLED display screen. The second electrode can be electrically connected to the touch sub-chip 220 via a flexible printed circuit (FPC), or, through the taper angle at the edge of the TFE layer, the upper second electrode can freely climb to the lower TFE substrate, thereby directly connecting to the metal on the lower display pixel array. Thus, the second electrode is electrically connected to the touch sub-chip 220 through the metal on the display pixel array.

[0070] It should be noted that, Figure 5 As a schematic diagram of the display pixel array, eight display pixel groups 31 and four second electrodes are shown. In other embodiments, the display pixel array may include more or fewer display pixel groups 31, and more or fewer second electrodes may be provided on the AMOLED display screen 30.

[0071] In one example, an AMOLED display screen includes 2560 rows × 1440 columns of display pixels. Each display pixel group includes 80 rows of display pixels. Thus, the AMOLED display screen is divided into 32 display pixel groups. That is, each row of the display pixel group array includes 1 display pixel group, and each column of the display pixel group array includes 32 display pixel groups.

[0072] It should be noted that in some embodiments, certain pixel rows of an AMOLED display screen may not participate in the division of the display pixel group array; that is, the display pixels included in certain pixel rows do not belong to any display pixel group. For example, the display pixels in rows 1 to 80 of an AMOLED display screen belong to the first display pixel group, the display pixels in rows 85 to 164 of an AMOLED display screen belong to the second display pixel group, while the display pixels in rows 81 to 84 of an AMOLED display screen do not belong to any display pixel group.

[0073] Based on the first electrode and the second electrode, the touch sub-chip 220 can perform touch detection through self-capacitance, mutual capacitance, or a combination of self-capacitance and mutual capacitance.

[0074] When performing touch detection via mutual capacitance, one of the first and second electrodes serves as the driving electrode, and the other serves as the receiving electrode. The touch sub-chip 220 outputs a touch driving signal to the driving electrode and receives a sensing signal from the receiving electrode, thereby performing touch detection based on the sensing signal. When the first electrode serves as the driving electrode, the touch sub-chip 220 can determine the lateral position of the finger touch based on the sensing signal from the second electrode. The lateral position is parallel to the pixel row. When the second electrode serves as the driving electrode, the touch sub-chip 220 can determine the vertical position of the finger touch based on the sensing signal from the first electrode. The vertical position is parallel to the pixel column. Thus, the touch sub-chip 220 can determine the finger touch position based on the sensing signals from the first and second electrodes.

[0075] In touch detection using a self-capacitance method, both the first and second electrodes serve as both driving and receiving electrodes. The touch sub-chip 220 outputs a touch driving signal to the driving electrode and receives a sensing signal from the receiving electrode, thereby performing touch detection based on the sensing signal. When the touch sub-chip 220 outputs a touch driving signal and receives a sensing signal through the first electrode, it can determine the vertical position of the finger touch based on the sensing signal. When the touch sub-chip 220 outputs a touch driving signal and receives a sensing signal through the second electrode, it can determine the horizontal position of the finger touch based on the sensing signal. Thus, the touch sub-chip 220 can determine the finger touch position based on the sensing signals from the first and second electrodes.

[0076] When touch detection is performed using a combination of self-capacitance and mutual capacitance, one of the first and second electrodes serves as both a driving electrode and a receiving electrode, while the other serves only as a receiving electrode. The touch sub-chip 220 outputs a touch driving signal to the driving electrode and receives a sensing signal from the receiving electrode, and then performs touch detection based on the sensing signal.

[0077] In one example, the touch sub-chip 220 outputs a touch drive signal to the first electrode and receives sensing signals from the first and second electrodes. The sensing signal from the first electrode is a self-capacitive sensing signal, and the sensing signal from the second electrode is a mutual-capacitive sensing signal. The touch sub-chip 220 can determine the vertical position of the finger touch based on the sensing signal from the first electrode and the horizontal position of the finger touch based on the sensing signal from the second electrode. Therefore, the touch sub-chip 220 can determine the finger's touch position based on the sensing signals from the first and second electrodes.

[0078] In another example, the touch sub-chip 220 outputs a touch drive signal to the second electrode and receives sensing signals from the first and second electrodes. The sensing signal from the first electrode is a mutual capacitance mode sensing signal, and the sensing signal from the second electrode is a self-capacitance mode sensing signal. The touch sub-chip 220 can determine the vertical position of the finger touch based on the sensing signal from the first electrode and the horizontal position of the finger touch based on the sensing signal from the second electrode. Therefore, the touch sub-chip 220 can determine the finger touch position based on the sensing signals from the first and second electrodes.

[0079] It should be noted that when the touch sub-chip 220 outputs a touch driving signal to the first electrode or receives a sensing signal from the first electrode, the display pixel group corresponding to the first electrode is in a non-light-emitting state. That is, when the display pixel group is not light-emitting, the touch sub-chip 220 outputs a touch driving signal to the cathode of the display pixel included in the display pixel group, or receives a sensing signal from the cathode of the display pixel included in the display pixel group.

[0080] Similar to the touch detection process based on a multi-row, multi-column display pixel array in the foregoing embodiments, when performing touch detection based on a multi-row, single-column display pixel array in this embodiment, the touch sub-chip 220 outputs touch driving signals to the cathodes of the display pixels included in the display pixel group located within the black stripes, and receives sensing signals from the cathodes of the display pixels included in the display pixel group located within the black stripes. For details, please refer to the description in the foregoing embodiments of touch detection based on a multi-row, multi-column display pixel array, which will not be repeated here.

[0081] In this embodiment, the display pixel groups are arranged in rows and columns to form a multi-row, one-column display pixel group array. Each display pixel group includes multiple adjacent pixel rows. Multiple second electrodes parallel to the pixel columns are also disposed on the AMOLED display screen. When the display sub-chip 210 uses PWM dimming, each display pixel group will scroll and not emit light. The touch sub-chip 220 outputs touch drive signals to the cathode and / or second electrode of the display pixels in at least one non-emitting display pixel group, and receives sensing signals from the cathode and second electrode of the display pixels in at least one non-emitting display pixel group. Touch detection is performed using these sensing signals, thereby achieving touch detection through self-capacitance, mutual capacitance, or a combination of self-capacitance and mutual capacitance, improving the applicability of the touch display chip 200. The cathodes of the display pixels included in the display pixel group are interconnected and reused as the first electrode. Only a second electrode parallel to the pixel column needs to be set on the AMOLED display screen. The touch sub-chip 220 is based on the first electrode and the second electrode and can perform touch detection by self-capacitance, mutual capacitance or a combination of self-capacitance and mutual capacitance. Since only an extra layer of electrodes is needed, the manufacturing efficiency of the AMOLED display screen can be improved and the manufacturing cost of the AMOLED display screen can be reduced.

[0082] In one possible implementation, the touch sub-chip 220 outputs touch drive signals to the cathodes of the display pixels included in the display pixel group during a time period when the display pixel group is not emitting light and the pixel rows adjacent to the display pixel group are not emitting light.

[0083] In one example, if a certain display pixel group includes display pixels located in rows 85 to 164 of an AMOLED display screen, then when the display pixels in rows 85 to 164 of the AMOLED display screen are not emitting light, and at least rows 84 and 165 are not emitting light, the touch sub-chip 220 can output touch driving signals to the cathodes of the display pixels included in the display pixel group.

[0084] Since the display sub-chip 210 includes multiple light-emitting control units, each light-emitting control unit is used to control the light emission of multiple adjacent pixel rows (such as 4, 8, 16, etc.). The display pixels included in a display pixel group are controlled by multiple light-emitting control units, and the pixel rows adjacent to the display pixel group are controlled by another light-emitting control unit. Therefore, the pixel rows adjacent to the display pixel group and the multiple pixel rows controlled by the same light-emitting control unit are synchronously illuminated or not illuminated. In one example, the display pixels included in a certain display pixel group are located in rows 85 to 164 of the AMOLED display screen. The display pixels in rows 81 to 84 of the AMOLED display screen are controlled by the same light-emitting control unit, and the display pixels in rows 165 to 168 of the AMOLED display screen are controlled by the same light-emitting control unit. Therefore, when the display pixels in rows 81 to 168 of the AMOLED display screen are not illuminated, the touch sub-chip 220 can output touch signals to the cathodes of the display pixels included in the display pixel group and receive sensing signals from the cathodes of the display pixels included in the display pixel group.

[0085] It should be noted that, since the touch sub-chip 220 can receive sensing signals from the first electrode while outputting touch driving signals to the first electrode, when a certain display pixel group and the pixel row adjacent to the display pixel group are not illuminated, the touch sub-chip 220 can receive sensing signals from the cathodes of the display pixels included in the display pixel group.

[0086] In this embodiment, when the display pixel group and the adjacent pixel rows are not emitting light, the touch sub-chip 220 can output touch driving signals to the cathodes of the display pixels included in the display pixel group and receive sensing signals from the cathodes of the display pixels included in the display pixel group. When the touch sub-chip 220 outputs touch driving signals to the cathodes of the display pixels included in the display pixel group, there is at least one non-illuminated pixel row between the display pixel group and the emitting pixel rows. This reduces the touch driving signals coupled to the emitting display pixels and reduces the impact of the touch driving signals on the sent display pixels. Thus, while reusing the cathodes of the display pixels as electrodes for touch detection, the display effect of the AMOLED display screen can be guaranteed.

[0087] In one possible implementation, when multiple rows of non-illuminated display pixel groups exist, the touch sub-chip 220 can determine at least one reference display pixel group from these rows. Then, when outputting a touch drive signal, the touch sub-chip 220 only outputs the touch drive signal to the cathodes of the display pixels included in the non-illuminated display pixel groups that are outside the reference display pixel group, and does not output the touch drive signal to the cathodes of the display pixels included in the reference display pixel group. The touch sub-chip 220 can receive sensing signals from the cathodes of the display pixels included in the display pixel groups that have received touch drive signals, and can receive reference signals from the cathodes of the display pixels included in the reference display pixel group. Therefore, the touch sub-chip 220 can perform touch detection based on the received sensing signals and reference signals.

[0088] The reference signal can indicate the deviation of the sensed signal caused by the coupling of the display drive signal to the cathode of the display pixel. The main source of display noise in AMOLED display screens is capacitive coupling noise caused by the periodic reversal of the polarity of the vertical data lines. Since the vertical data lines run through the entire display screen area, the display noise will couple to each row of unlit display pixel groups. When the touch sub-chip 220 performs touch detection coding on other display pixel groups, it does not perform touch detection coding on at least one row of reference display pixel groups. Therefore, it can collect display noise from the cathodes of the display pixels included in the reference display pixel group. Then, the touch sub-chip 220 can process the sensed signal according to the display noise to cancel or compensate for the display noise.

[0089] If the display pixel groups are distributed in a multi-row, multi-column array, then each row of reference display pixel groups includes multiple reference display pixel groups. Since the main source of display noise is capacitive coupling noise caused by the periodic reversal of the polarity of the vertical data lines, the display noise of display pixel groups located in the same column is the same. The touch sub-chip 220 can receive reference signals from each reference display pixel group. Therefore, when processing the sensing signal received from a certain display pixel group, the touch sub-chip 220 can perform display noise cancellation or compensation on the sensing signal received from that display pixel group based on the reference signals received from the reference display pixel groups located in the same column as that display pixel group, ensuring effective display noise cancellation or compensation of the sensing signal, thereby ensuring the accuracy of touch detection.

[0090] Figure 6 A schematic diagram of a display noise compensation scheme according to an embodiment of this disclosure is shown. Figure 6As shown, the display pixel group 31 is distributed in a multi-row, multi-column display pixel group array. The display pixel groups in the first and Nth rows of the array are not illuminated. The touch sub-chip 220 encodes the display pixel group in the first row but not the display pixel group in the Nth row. That is, the touch sub-chip 220 outputs touch drive signals to the cathodes of the display pixels included in the first row, but not to the cathodes of the display pixels included in the Nth row. The sensed signal from the display pixel group in the first row and Mth column is input to the negative input terminal of the operational amplifier (OPA) included in the analog front end (AFE) after passing through a resistor. The reference signal from the display pixel group in the Nth row and Mth column is input to the positive input terminal of the OPA after passing through a resistor. The AFE performs display noise cancellation or compensation on the sensed signal based on the reference signal.

[0091] If the display pixel group is distributed in a multi-row, one-column array, then each row of reference display pixel group includes one reference display pixel group. The reference signal received by the touch sub-chip 220 from the reference display pixel group reflects the display noise of the entire display screen. Then, the touch sub-chip 220 performs display noise cancellation or compensation on the sensing signals received from other display pixel groups based on the reference signal received from the reference display pixel group.

[0092] In this embodiment, when multiple rows of display pixel groups are not illuminated, the touch sub-chip 220 leaves at least one row of unilluminated display pixel groups unmarked for touch coding. While coding other unilluminated display pixel groups and acquiring sensing signals, it acquires reference signals from the unmarked and unilluminated display pixel groups. The reference signals can show the impact of noise on the sensing signals. Thus, the touch sub-chip 220 can cancel or compensate for display noise in the sensing signals based on the reference signals. Then, it performs touch detection based on the sensing signals after noise cancellation or compensation, thereby reducing the impact of display noise on the signal-to-noise ratio (SNR) and improving the accuracy of touch detection.

[0093] In one possible implementation, such as Figure 7 The schematic diagram shown is of a touch display chip 200, which includes a display sub-chip 210, a touch sub-chip 220, and a noise simulation unit 230. The noise simulation unit 230 is electrically connected to both the display sub-chip 210 and the touch sub-chip 220.

[0094] The display sub-chip 210 can send an interference reference signal to the noise simulation unit 230 based on the display data. The noise simulation unit 230 can generate a simulated interference signal based on the interference reference signal and send the simulated interference signal to the touch sub-chip 220. The simulated interference signal is used to simulate the interference signal generated by the display driving signal coupled to the cathode of the display pixel and affecting touch detection. The touch sub-chip 220 can perform touch detection based on the sensing signal and the simulated interference signal.

[0095] When the display sub-chip 210 outputs a display driving signal, it simultaneously outputs a display driving signal to multiple display pixels included in the pixel row. The driving circuit between the display pixel and the display sub-chip 210 will couple the display driving signal to the cathode of the display pixel to generate an interference signal. The interference signal will couple to the first electrode, thereby affecting the touch detection.

[0096] The display sub-chip 210 can send an interference reference signal to the noise simulation unit 230 simultaneously with the display driving signal. The interference reference signal is correlated with the display driving signal output by the display sub-chip 210. In one example, the interference reference signal is positively correlated with the display driving signal; the higher the signal strength of the display driving signal, the stronger the signal strength of the interference reference signal. After receiving the interference reference signal, the noise simulation unit 230 can generate a simulated interference signal based on it. This simulated interference signal can mimic the signal interference caused by the display driving signal on touch detection.

[0097] The touch sub-chip 220 outputs a touch driving signal to the cathodes of the display pixels included in the non-light-emitting display pixel group. The touch driving signal can be a square wave, a sine wave, a trapezoidal wave, etc. After receiving the touch driving signal, the first electrode (the cathode of the display pixels included in the display pixel group) generates a sensing signal based on a self-capacitive or mutual-capacitive touch detection method when touched by a finger, and transmits the sensing signal to the touch sub-chip 220. The touch sub-chip 220 can perform touch detection based on the sensing signal and a simulated interference signal. Specifically, the touch sub-chip 220 can use a simulated interference signal to cancel out the interference signal generated by the display driving signal coupled to the first electrode in the sensing signal.

[0098] In one example, such as Figure 8 The diagram shows a noise simulation unit 230, which includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. The display sub-chip 210 includes a third resistor R3, and the touch sub-chip 220 includes a processing unit 221 and multiple recognition units 222.

[0099] The first terminal of the first resistor R1 is electrically connected to the display sub-chip 210, and the second terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is connected to the first terminal of the third resistor R3 and the first terminal of the second capacitor C2. The second terminal of the third resistor R3 is used to receive the cathode plate voltage of the display pixel cathode, or the second terminal of the third resistor R3 is grounded. The second terminal of the second capacitor C2 is electrically connected to the touch sub-chip 220. The first terminal of the second resistor R2 is connected to the second terminal of the second capacitor C2, and the second terminal of the second resistor R2 receives the common-mode voltage VCMI of the touch drive signal.

[0100] The first resistor R1 can simulate the equivalent resistance of the driving circuit of the display pixel, the first capacitor C1 can simulate the equivalent capacitance between the driving circuit of the display pixel and the cathode of the display pixel, the second capacitor C2 can simulate the equivalent capacitance between the cathode of the display pixel and the first electrode, the second resistor R2 can simulate the equivalent resistance of the first electrode, and the third resistor R3 can simulate the resistance of the cathode of the display pixel. When the third resistor R3 receives the voltage of the cathode of the display pixel, the noise simulation unit 230 can simulate the voltage fluctuation of the cathode of the display pixel and the impact of the display driving signal coupled to the cathode of the display pixel on touch detection. When the third resistor R3 is grounded, the noise simulation unit 230 will only simulate the impact of the display driving signal coupled to the cathode of the display pixel on touch detection. After the display sub-chip 210 outputs the interference reference signal, the interference reference signal passes through the first resistor R1, the second resistor R2, the first capacitor C1 and the second capacitor C2, and the third resistor R3 and the voltage of the cathode of the display pixel received by the third resistor R3 to form a simulated interference signal. The circuit of the noise simulation unit 230 described above can be used to simulate the interference signal generated by touch detection after the display signal is coupled to the cathode of the display pixel.

[0101] The identification unit 222 is electrically connected to the first electrode, and different identification units 222 are electrically connected to different first electrodes. The processing unit 221 is electrically connected to each identification unit 222. When a finger touches the surface, the first electrode located under the finger touch area generates a sensing signal through self-capacitance or mutual capacitance, and transmits the sensing signal to the identification unit 222 connected to the first electrode. At the same time, the identification unit 222 receives a simulated interference signal sent by the noise simulation unit 230, and then the touch sub-chip 220 performs touch detection based on the simulated interference signal and the sensing signal. In one example, when performing touch detection, the touch sub-chip 220 performs touch detection based on the common-mode voltage of the sensing signal and the touch driving signal. When the touch sub-chip 220 receives the simulated interference signal, the touch sub-chip 220 performs touch detection based on the sensing signal, the simulated interference signal, and the common-mode voltage of the sensing signal and the touch driving signal. For example, the touch sub-chip 220 performs touch detection based on the superposition of the sensing signal, the analog interference signal, and the common-mode voltage. In this way, the interference signal generated by the display driving signal coupled to the first electrode can be canceled by the analog interference signal.

[0102] The processing unit 221 can be a processing unit with processing capabilities, such as a microcontroller unit (MCU). The processing unit 221 receives the sensing signal sent by the recognition unit 222 and performs touch detection based on the sensing signal.

[0103] like Figure 8 As shown, the identification unit 222 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, an operational amplifier D1, and an amplification unit D2. The first end of the fourth resistor R4 is electrically connected to the first electrode, and 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, and 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, and the second end of the fifth resistor R5 is connected to the second end of the third capacitor C3. The input terminal of the amplification unit D2 is electrically connected to the second end of the second capacitor C2, and the output terminal of the amplification unit D2 is electrically connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is connected to both the first end of the seventh resistor R7 and the positive input terminal of the operational amplifier D1. The second end of the seventh resistor R7 receives the common-mode voltage VCMI of the touch drive signal.

[0104] The first end of the sixth resistor R6 is electrically connected to the output terminal of the noise simulation unit 230, and the second end of the sixth resistor R6 is electrically connected to the positive input terminal of the operational amplifier D1. Therefore, the analog interference signal output by the noise simulation unit 230 can be input to the negative input terminal of the operational amplifier D1 through the sixth resistor R6. 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 to the positive input terminal of the operational amplifier D1. The positive input terminal of the operational amplifier D1 receives the superposition signal of the common-mode voltage VCMI and the analog interference signal.

[0105] The fifth resistor R5 can serve as the feedback resistor for operational amplifier D1. A transimpedance amplifier circuit can be formed by the feedback resistor (fifth resistor R5), the third capacitor C3, and operational amplifier D1. The negative input terminal of operational amplifier D1 is electrically connected to the first electrode through the fourth resistor R4. The positive input terminal of operational amplifier D1 receives the superposition signal of the common-mode voltage VCMI and the analog interference signal. The transimpedance amplifier circuit can convert the induced signal (current signal) generated by the first electrode into a recognition signal (voltage signal). Since the signal input to the positive input terminal of operational amplifier D1 is the superposition signal of the common-mode voltage VCMI and the analog interference signal, during the conversion of the induced signal (current signal) generated by the first electrode into a recognition signal (voltage signal), operational amplifier D1 can cancel out the signal interference in the analog interference signal received at the positive input terminal and the signal interference in the induced signal transmitted from the first electrode.

[0106] The input terminal of the amplification unit D2 is connected to the second terminal of the second capacitor C2 and the first terminal of the second resistor R2, respectively. The output terminal of the amplification unit D2 is connected to the first terminal of the sixth resistor R6. The amplification unit D2 can receive the analog interference signal and amplify the analog interference signal, so that the identification unit 222 can perform touch detection based on the sensing signal and the amplified analog interference signal.

[0107] In this embodiment of the disclosure, the noise simulation unit 230 can simulate display noise caused by the on-screen circuit and generate a corresponding simulated interference signal. After the noise simulation unit 230 transmits the simulated interference signal to the touch sub-chip 220, the touch sub-chip 220 can cancel or compensate for the display noise included in the sensing signal according to the simulated interference signal, so as to ensure the accuracy of the touch detection result obtained by the touch sub-chip 220 according to the sensing signal.

[0108] In one possible implementation, when the display pixel group is not emitting light, before or after the touch sub-chip 220 outputs a touch drive signal to the cathode of the display pixel group, the display sub-chip 210 may send a control signal to the display pixel group to cause the display pixel group to perform some or all of the following: reset, voltage input, and voltage threshold detection.

[0109] The display sub-chip 210 controls the illumination of the display pixels according to the PWM signal. When the PWM signal is low, the display pixels are controlled to illuminate; when the PWM signal is high, the display pixels are controlled to not illuminate. When the PWM signal is high, i.e., when the display pixels are not illuminating, the display sub-chip 210 needs to control the reset of the display pixels, voltage input, and voltage threshold detection.

[0110] When the display pixel group is not emitting light, the touch sub-chip 220 outputs touch drive signals to the cathodes of the display pixels included in the display pixel group. Similarly, when the display pixel group is not emitting light, the display sub-chip 210 also needs to send control signals to the display pixels included in the display pixel group to enable the display pixels included in the display pixel group to complete reset, voltage input, and voltage threshold detection. Therefore, even when the display pixel group is not emitting light, the display sub-chip 210 can send control signals to the display pixels included in the display pixel group before or after the touch sub-chip 220 outputs touch drive signals to the cathodes of the display pixels included in the display pixel group.

[0111] If the display sub-chip 210 sends a control signal before the touch sub-chip 220 outputs a touch driving signal, then for a period of time before the touch sub-chip 220 outputs the touch driving signal, none of the display pixels in the display pixel group will emit light, and the display sub-chip 210 can send control signals to each display pixel in the display pixel group during this period. If the display sub-chip 210 sends a control signal after the touch sub-chip 220 outputs the touch driving signal, then for a period of time after the touch sub-chip 220 outputs the touch driving signal, none of the display pixels in the display pixel group will emit light, and the display sub-chip 210 can send control signals to each display pixel in the display pixel group during this period.

[0112] The display sub-chip 210 only needs to complete the reset of the display pixels, voltage input and voltage threshold detection at one moment in each frame. At other times when the display pixels are not emitting light, the touch sub-chip 220 can output touch drive signals.

[0113] In this embodiment, the display sub-chip 210 needs to send control signals to the display pixels included in the display pixel group when the display pixel group is not emitting light, so that the display pixels can complete reset, voltage input, and voltage threshold detection. The touch sub-chip 220 needs to output touch driving signals to the cathodes of the display pixels included in the display pixel group when the display pixel group is not emitting light. The display sub-chip 210 can send control signals before or after the touch sub-chip 220 outputs touch driving signals. Specifically, the order in which the display sub-chip 210 sends control signals and the touch sub-chip 220 outputs touch driving signals can be flexibly selected according to actual needs to meet personalized requirements and improve the applicability of the touch display chip.

[0114] In one possible implementation, the display sub-chip 210 includes multiple light-emitting control units, each connected to multiple adjacent pixel rows in the AMOLED display screen 30, with different light-emitting control units electrically connected to different rows. The light-emitting control units can control the light emission of the display pixels included in the connected pixel rows and can send control signals to the display pixels included in the connected pixel rows. For example, each light-emitting control unit can connect to two, four, or eight adjacent pixel rows.

[0115] A display pixel group comprises display pixels electrically connected to multiple light-emitting control units; that is, a display pixel group includes display pixels controlled by multiple light-emitting control units. For example, each light-emitting control unit connects to four adjacent pixel rows. If each display pixel group includes display pixels in 60 adjacent pixel rows and 60 adjacent pixel columns (corresponding to a display pixel group array with multiple rows and columns, each display pixel group including 60 rows × 60 columns of display pixels), then each display pixel group includes display pixels electrically connected to four light-emitting control units. If each display pixel group includes all display pixels in 60 adjacent pixel rows (corresponding to a display pixel group array with multiple rows and columns, each display pixel group including 60 adjacent rows of display pixels), then each display pixel group includes display pixels electrically connected to four light-emitting control units.

[0116] When the light-emitting control unit outputs a display drive signal to the connected pixel row, multiple light-emitting control units electrically connected to the display pixels included in the same display pixel group output display drive signals to the electrically connected pixel row in sequence.

[0117] In one example, such as Figure 9The timing diagram shown illustrates the control of display pixel groups. The AMOLED display screen comprises 2580 rows × 1440 columns of display pixels, with each pixel group consisting of 60 rows × 60 columns. Therefore, the AMOLED display screen is divided into a 43-row × 24-column pixel group array. Each luminous control unit (EM) controls four adjacent rows of pixels. For example, EM1 controls rows 1-4, EM2 controls rows 5-8, and so on, with EM645 controlling rows 2577-2580.

[0118] The cathodes of the display pixels in the 24 display pixel groups in the i-th row of the display pixel group array are defined as electrodes RXI, the cathodes of the display pixels in the 24 display pixel groups in the 1st row are defined as electrodes RX1, the cathodes of the display pixels in the 24 display pixel groups in the 2nd row are defined as electrodes RX2, and so on, with the cathodes of the display pixels in the 24 display pixel groups in the 43rd row being defined as electrodes RX43.

[0119] The 60 rows of display pixels corresponding to electrode RX1 are controlled by EM1 to EM15, the 60 rows of display pixels corresponding to electrode RX2 are controlled by EM16 to EM30, and so on. The 60 rows of display pixels corresponding to electrode RX43 are controlled by EM631 to EM645.

[0120] Each light-emitting control unit (EM) controls the display pixels in the connected pixel row according to an independent PWM signal. When the PWM signal is low, the display pixels are controlled to emit light; when the PWM signal is high, the display pixels are controlled to not emit light.

[0121] like Figure 9 As shown, the touch sub-chip 220 outputs a touch drive signal to the RXI electrode when the PWM signal is high, i.e., performs RXI coding. Figure 9 As can be seen, during RXI coding, the PWM signals of multiple EMs controlling the 60 rows of display pixels corresponding to RXI are all at a high level, so all 60 rows of display pixels corresponding to RXI are illuminated, that is, the 60 rows of display pixels corresponding to RXI form black stripes.

[0122] At the same time, the touch sub-chip 220 can code multiple RXI, that is, output touch drive signals to the cathodes of the display pixels included in the multi-row display pixel group located in multiple black stripes. For example... Figure 9 As shown, the touch sub-chip 220 performs coding on RX1 and at least RX41, on RX2 and at least RX42, and on RX3 and at least RX43.

[0123] like Figure 9As shown, when the corresponding PWM signal is high, the touch sub-chip 220 encodes RXI. Before and after encoding RXI, the corresponding PWM signal is high for a period of time. The display control unit EM can send a control signal before or during the period when the corresponding PWM signal is high.

[0124] like Figure 9 As shown, the rising edge timing of the PWM signals of the 15 EMs controlling the 60 rows of display pixels corresponding to RXI is misaligned. The EMs start outputting display drive signals at the rising edge of the PWM signal, so the 15 EMs controlling the 60 rows of display pixels corresponding to RXI output display drive signals sequentially. For example, EM1 to EM15 are used to control the 60 rows of display pixels corresponding to RX1. Since the rising edge timing of the 15 PWM signals corresponding to EM1 to EM15 is misaligned, EM1 to EM15 sequentially output display drive signals to the connected pixel rows. This results in only 4 rows of display pixels corresponding to the same RXI being simultaneously lit or turned off, thus avoiding a large instantaneous current change. The negative drive voltage (ELVSS) of the display pixel circuit would otherwise affect the response time of the AMOLED display screen due to a large instantaneous current change.

[0125] like Figure 9 As shown, when the touch sub-chip 220 encodes RXI, the PWM signals of the 15 EMs controlling the 60 rows of display pixels corresponding to RXI are all at a high level. Furthermore, the PWM signals of the EMs controlling the adjacent pixel rows of the 60 rows of display pixels corresponding to RXI are also at a high level, ensuring that encoding RXI does not affect the display of other pixel rows. For example, when the touch sub-chip 220 encodes RX1, the PWM signals of EM1 to EM15 are all at a high level, and the PWM signal of EM16 is also at a high level. When the touch sub-chip 220 encodes RX2, the PWM signals of EM16 to EM30 are all at a high level, and the PWM signals of EM15 and EM31 are also at a high level.

[0126] In this embodiment of the disclosure, when the light-emitting control unit outputs a display driving signal to the connected pixel row, multiple light-emitting control units electrically connected to the display pixels included in the same display pixel group sequentially output display driving signals to the electrically connected pixel row, so that only the number of pixel rows controlled by each light-emitting control unit in the multiple pixel rows of the same display pixel group are lit or turned off at the same time, so that there will be no instantaneous large current change. The negative driving voltage ELVSS of the display pixel circuit will affect the response time of the AMOLED display screen due to the instantaneous large current change.

[0127] It should be noted that if the driving capability of the power management integrated circuit (PMIC) or the internal switching speed of the display sub-chip 210 is fast enough, multiple light-emitting control units electrically connected to the display pixels included in the same display pixel group can also simultaneously output display driving signals to the electrically connected pixel rows.

[0128] In one possible implementation, such as Figure 10 The timing diagram shown is for the control of the display pixel group. The PWM signal is a periodic signal, which includes multiple high-level pulses. Thus, the touch sub-chip 220 can periodically output touch drive signals to the cathodes of the display pixels included in the non-illuminated display pixel group, thereby realizing continuous touch detection.

[0129] This disclosure also provides a touch chip for performing touch detection on an AMOLED display screen. The AMOLED display screen includes a plurality of display pixels, at least a portion of which are divided into a plurality of display pixel groups. Each display pixel group includes a plurality of display pixels, and the cathodes of the plurality of display pixels within the same display pixel group are electrically connected. The touch chip is configured to be electrically connected to the cathodes of the display pixels within the display pixel groups. The touch chip is used to output touch driving signals to the cathodes of at least a portion of the non-light-emitting display pixels within the display pixel groups, and these touch driving signals are used for touch detection.

[0130] In one possible implementation, the display pixel group includes display pixels located in multiple adjacent pixel rows, and the width of the display pixel group along the pixel row direction is equal to the width of the pixel row of the AMOLED display screen; the multiple display pixel groups are arranged sequentially along the pixel column direction of the AMOLED display screen; the touch chip is electrically connected to multiple electrodes disposed on the AMOLED display screen, and the electrodes are parallel to the pixel column direction of the AMOLED display screen; the touch chip is used to output a touch driving signal to one of the non-light-emitting display pixel groups and the multiple electrodes, and to receive a sensing signal output by the other of the non-light-emitting display pixel groups and the multiple electrodes, and to perform touch detection based on the sensing signal; or, at least one of the non-light-emitting display pixel groups and the multiple electrodes serves as both a driving electrode and a receiving electrode, the touch chip outputs a driving signal to the driving electrode, and receives a sensing signal from the receiving electrode, and to perform touch detection based on the sensing signal.

[0131] In one possible implementation, the touch chip is used to output a touch drive signal to the cathode of the display pixels included in the display pixel group when the display pixel group is not emitting light and the pixel row adjacent to the display pixel group is not emitting light.

[0132] In one possible implementation, the touch chip is used to receive a reference signal output from at least one row of reference display pixel groups, and to perform touch detection based on the reference signal and the sensing signal, wherein the reference display pixel group is a display pixel group that is not emitting light and has not received a touch driving signal, and the reference signal is used to indicate the deviation of the sensing signal caused by the display driving signal being coupled to the cathode of the display pixel.

[0133] In one possible implementation, the touch chip is used to receive a simulated interference signal from the noise simulation unit and perform touch detection based on the sensing signal and the simulated interference signal. The simulated interference signal is generated by the noise simulation unit based on an interference reference signal, which is generated by the display chip based on display data. The simulated interference signal is used to simulate the interference signal generated by the display driving signal coupled to the cathode of the display pixel on the touch detection.

[0134] It should be noted that the touch chip in this embodiment can achieve the function of the touch sub-chip 220 in any of the aforementioned touch display chips 200 by cooperating with the display chip, and realize the reuse of the cathode of the display pixel as the touch electrode for touch detection. The specific processing performed by the touch chip in the touch detection process can be found in the description of the touch sub-chip 220 in the aforementioned touch display chip embodiments, and will not be repeated here.

[0135] This disclosure also provides a touch display system, which includes a display chip and a touch chip as described in any of the above embodiments. The display chip is configured to be electrically connected to a plurality of display pixels included in an AMOLED display screen. The display chip can output display driving signals to some of the display pixels to cause the display pixels receiving the display driving signals to emit light.

[0136] It should be noted that in the touch display system, the touch chip and the display chip work together to reuse the cathode of the display pixel as a touch electrode for touch detection. The display chip can realize the function of the display sub-chip 210 in any of the aforementioned touch display chips 200. The function of the display chip can be found in the description of the display sub-chip 210 in the aforementioned touch display chip embodiments, and will not be repeated here.

[0137] It should be noted that the difference between the touch display system and the touch display chip 200 in the aforementioned embodiment is that the touch chip and the display chip in the touch display system can be set independently, rather than the display sub-chip 210 and touch sub-chip 220 being packaged in the same chip as in the touch display chip 200 solution.

[0138] This disclosure also provides an electronic device, including the touch display chip or touch display system of any of the foregoing embodiments, and an AMOLED display screen. The AMOLED display screen includes a plurality of display pixels, at least some of which are divided into a plurality of display pixel groups, each display pixel group including a plurality of display pixels, and the cathodes of the plurality of display pixels in the same display pixel group are electrically connected.

[0139] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this disclosure can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this disclosure.

[0140] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments disclosed herein.

[0141] The above embodiments are only used to illustrate the embodiments of this disclosure, and are not intended to limit the embodiments of this disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this disclosure. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this disclosure, and the patent protection scope of the embodiments of this disclosure should be defined by the claims.

Claims

1. A touch display chip, used for touch detection and display control of an AMOLED display screen, characterized in that, The AMOLED display screen includes a plurality of display pixels, at least some of which are divided into a plurality of display pixel groups, each of which includes a plurality of display pixels. The cathodes of the plurality of display pixels in the same display pixel group are electrically connected. The touch display chip includes a display sub-chip and a touch sub-chip. The display sub-chip is configured to be electrically connected to the plurality of display pixels; the touch sub-chip is configured to be electrically connected to the cathode of the display pixels included in the display pixel group; The display sub-chip is used to output a display driving signal to a portion of the display pixels, so that the display pixels receiving the display driving signal emit light; The touch sub-chip is used to output touch driving signals to the cathodes of at least some of the display pixels included in the non-light-emitting display pixel group, and the touch driving signals are used for touch detection. 2.The touch display chip of claim 1, wherein, The display pixel group includes display pixels located in multiple adjacent pixel rows. The multiple display pixel groups are arranged in rows and columns to form a display pixel group array. Each row and each column of the display pixel group array includes multiple display pixel groups. The row direction of the display pixel group array is the same as the pixel row direction of the AMOLED display screen. The touch sub-chip is configured to output the touch driving signal to the cathode of the display pixel in at least one row of the display pixel group that is not emitting light, and to receive the sensing signal output by the cathode of the display pixel, and to perform touch detection based on the sensing signal. 3.The touch display chip of claim 1, wherein, The display pixel group includes display pixels located in multiple adjacent pixel rows, and the width of the display pixel group along the pixel row direction is equal to the width of the pixel row of the AMOLED display screen; the multiple display pixel groups are arranged sequentially along the pixel column direction of the AMOLED display screen; the touch sub-chip is electrically connected to multiple electrodes disposed on the AMOLED display screen, and the electrodes are parallel to the pixel column direction of the AMOLED display screen; The touch sub-chip is configured to output the touch driving signal to one of the non-illuminated display pixel group and the plurality of electrodes, and receive a sensing signal output by the other of the non-illuminated display pixel group and the plurality of electrodes, and perform touch detection based on the sensing signal; or, at least one of the non-illuminated display pixel group and the plurality of electrodes serves as both a driving electrode and a receiving electrode, the touch sub-chip outputs the touch driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode, and performs touch detection based on the sensing signal.

4. The touch display chip according to any one of claims 1-3, characterized in that, The touch sub-chip is used to output the touch driving signal to the cathode of the display pixels included in the display pixel group when the display pixel group is not emitting light and the pixel row adjacent to the display pixel group is not emitting light.

5. The touch display chip according to claim 2 or 3, characterized in that, The touch sub-chip is used to receive a reference signal output from at least one row of reference display pixel groups, and to perform touch detection based on the reference signal and the sensing signal. The reference display pixel group is the display pixel group that is not emitting light and has not received the touch driving signal. The reference signal is used to indicate the deviation of the sensing signal caused by the display driving signal being coupled to the cathode of the display pixel. 6.The touch display chip of claim 2 or 3, wherein, The touch display chip also includes: a noise simulation unit; The noise simulation unit is electrically connected to the touch sub-chip and the display sub-chip, respectively; The display sub-chip is used to send an interference reference signal to the noise simulation unit according to the display data; The noise simulation unit is used to generate a simulated interference signal based on the interference reference signal and send the simulated interference signal to the touch sub-chip. The simulated interference signal is used to simulate the interference signal generated by the display driving signal after it is coupled to the cathode of the display pixel and affects the touch detection. The touch control sub-chip is used to perform touch detection based on the sensing signal and the analog interference signal.

7. The touch display chip according to claim 1, characterized in that, The display sub-chip is configured to send a control signal to the display pixels included in the display pixel group when the display pixel group is not emitting light, and before or after the touch sub-chip transmits the touch driving signal to the cathode of the display pixels included in the display pixel group. The control signal is used to perform some or all of the following on the display pixels: reset, voltage input, and voltage threshold detection.

8. The touch display chip according to claim 2 or 3, characterized in that, The display sub-chip includes multiple light-emitting control units, each of which is connected to multiple adjacent pixel rows in the AMOLED display screen, and different light-emitting control units are electrically connected to different pixel rows; The display pixel group includes display pixels electrically connected to a plurality of the light-emitting control units; the plurality of light-emitting control units electrically connected to the display pixels included in the same display pixel group sequentially output the display driving signal to the electrically connected pixel row. 9.A touch chip, used for touch detection of an AMOLED display screen, characterized in that, The AMOLED display screen includes a plurality of display pixels, at least a portion of which are divided into a plurality of display pixel groups, each of which includes a plurality of display pixels, and the cathodes of the plurality of display pixels in the same display pixel group are electrically connected; the touch chip is configured to be electrically connected to the cathodes of the display pixels in the display pixel group. The touch chip is configured to output a touch driving signal to the cathode of at least some of the display pixels included in the non-light-emitting display pixel group, the touch driving signal being used for touch detection.

10. The touch chip of claim 9, wherein, The display pixel group includes display pixels located in multiple adjacent pixel rows. The multiple display pixel groups are arranged in rows and columns to form a display pixel group array. Each row and each column of the display pixel group array includes multiple display pixel groups. The row direction of the display pixel group array is the same as the pixel row direction of the AMOLED display screen. The touch chip is configured to output the touch driving signal to the cathode of the display pixel in at least one row of the display pixel group that is not emitting light, and to receive the sensing signal output by the cathode of the display pixel, and to perform touch detection based on the sensing signal.

11. The touch chip of claim 9, wherein, The display pixel group includes display pixels located in multiple adjacent pixel rows, and the width of the display pixel group along the pixel row direction is equal to the width of the pixel row of the AMOLED display screen; the multiple display pixel groups are arranged sequentially along the pixel column direction of the AMOLED display screen; the touch chip is electrically connected to multiple electrodes disposed on the AMOLED display screen, and the electrodes are parallel to the pixel column direction of the AMOLED display screen; The touch chip is configured to output the touch driving signal to one of the non-illuminated display pixel group and the plurality of electrodes, and receive a sensing signal output by the other of the non-illuminated display pixel group and the plurality of electrodes, and perform touch detection based on the sensing signal; or, at least one of the non-illuminated display pixel group and the plurality of electrodes serves as both a driving electrode and a receiving electrode, the touch chip outputs the driving signal to the driving electrode, and receives the sensing signal output by the receiving electrode, and performs touch detection based on the sensing signal.

12. The touch chip according to any one of claims 9-11, characterized in that, The touch chip is configured to output the touch driving signal to the cathode of the display pixels included in the display pixel group when the display pixel group is not emitting light and the pixel row adjacent to the display pixel group is not emitting light.

13. The touch chip according to claim 10 or 11, characterized in that, The touch chip is configured to receive a reference signal output from at least one row of reference display pixel groups, and to perform touch detection based on the reference signal and the sensing signal. The reference display pixel group is the display pixel group that is not emitting light and has not received the touch driving signal. The reference signal is used to indicate the deviation of the sensing signal caused by the display driving signal output by the display chip being coupled to the cathode of the display pixel.

14. The touch chip according to claim 10 or 11, characterized in that, The touch chip is used to receive a simulated interference signal from the noise simulation unit and perform touch detection based on the sensing signal and the simulated interference signal. The simulated interference signal is generated by the noise simulation unit based on a reference signal, and the reference signal is generated by the display chip based on display data. The simulated interference signal is used to simulate the interference signal generated by the display driving signal output by the display chip coupled to the cathode of the display pixel and affecting touch detection.

15. A touch display system, comprising: include: The display chip and the touch chip as described in any one of claims 9-14; The display chip is configured to be electrically connected to an AMOLED display screen, which includes a plurality of display pixels; The display chip is configured to output display driving signals to a portion of the display pixels, so that the display pixels receiving the display driving signals emit light.

16. An electronic device, comprising: include: The touch display chip as described in any one of claims 1-8 or the touch display system as described in claim 15, and the AMOLED display screen; The AMOLED display screen includes a plurality of display pixels, at least some of which are divided into a plurality of display pixel groups, each of which includes a plurality of display pixels, and the cathodes of the plurality of display pixels in the same display pixel group are electrically connected.

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