Touch chip and display

Abstract

The embodiment of the present application provides a touch chip and a display, a first multiplexing module is connected with a self-capacitance channel of a display substrate and a first sensing circuit module; the first sensing circuit module is connected with an analog signal end of a first analog-digital converter module, a digital signal end of the first analog-digital converter module is connected with a first end of a processing module; a second end of the processing module is connected with a first input end of a high-voltage driving circuit; an output end of the high-voltage driving circuit is connected with a mutual-capacitance data transmission channel of the display substrate; a second sensing circuit module is connected with a mutual-capacitance data receiving channel of the display substrate and an analog signal end of a second analog-digital converter module; the processing module controls the high-voltage driving circuit to provide a first frequency driving signal for the mutual-capacitance data transmission channel and controls the first multiplexing module and the first sensing circuit module to provide a second frequency driving signal for the self-capacitance channel. Through the above touch chip design, the touch report point rate in the touch operation area is improved.

Description

Technical Field

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

[0002] In recent years, OLED (Organic Light-Emitting Diode) touch displays have gradually taken over the high-end electronic device market due to their high refresh rate, high touch sampling rate, and high-quality picture, which better meet user needs.

[0003] However, when performing operations such as gaming on an OLED touchscreen, the touch reporting rate of electronic devices can only reach 480Hz (touch response speed 2.1ms), which still cannot meet the higher operational needs of users. Summary of the Invention

[0004] The purpose of this application is to provide a touch chip and display to improve the touch reporting rate in the touch operation area. The specific technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a touch chip, including:

[0006] The system comprises a first multiplexing module, a first sensing circuit module, a first analog-to-digital converter module, a high-voltage drive circuit, a charge pump, a second sensing circuit module, a second analog-to-digital converter module, and a processing module.

[0007] The first multiplexing module is connected to the self-capacitive channel of the display substrate, and the first multiplexing module is also connected to the first sensing circuit module; the first sensing circuit module is connected to the analog signal terminal of the first analog-to-digital converter module, and the digital signal terminal of the first analog-to-digital converter module is connected to the first terminal of the processing module.

[0008] The second terminal of the processing module is connected to the first input terminal of the high-voltage driving circuit; the output terminal of the high-voltage driving circuit is connected to the mutual capacitance data transmission channel of the display substrate; the control terminal of the charge pump is connected to the third terminal of the processing module, and the output terminal of the charge pump is connected to the second input terminal of the high-voltage driving circuit.

[0009] The second sensing circuit module is connected to the mutual capacitance data receiving channel of the display substrate; the second sensing circuit module is also connected to the analog signal terminal of the second analog-to-digital converter module, and the digital signal terminal of the second analog-to-digital converter module is connected to the fourth terminal of the processing module.

[0010] The processing module is used to control the high-voltage driving circuit to provide a first frequency driving signal to the mutual capacitance data transmission channel of the display substrate; and to control the first multiplexing module and the first sensing circuit module to provide a second frequency driving signal to the self-capacitive channel of the display substrate.

[0011] In one possible implementation, the touch chip further includes a second multiplexing module;

[0012] The input terminal of the second multiplexing module is connected to the self-capacitive channel of the display substrate, and the output terminal of the second multiplexing module is connected to the input terminal of the second sensing circuit module.

[0013] The processing module is also used to control the second multiplexing module and the second sensing circuit module to provide a second frequency driving signal to the self-capacitive channel of the display substrate.

[0014] In one possible implementation, the input terminal of the first multiplexing module is connected to the respective accommodating channel of the first display area in the display substrate, and the input terminal of the second multiplexing module is connected to the respective accommodating channel of the third display area in the display substrate.

[0015] The input terminal of the second sensing circuit module is connected to each mutual capacitance data receiving channel of the second display area in the display substrate, and the output terminal of the high voltage driving circuit is connected to each mutual capacitance data transmission channel of the second display area in the display substrate.

[0016] In one possible implementation, the first sensing circuit module includes x sensors, and the first multiplexing module is 1: Multiplexing module; the second sensing circuit module includes y sensors, and the second multiplexing module is 1: A multiplexing module, wherein n is the number of self-capacitive channels in the first display area of ​​the display substrate, and m is the number of self-capacitive channels in the third display area of ​​the display substrate.

[0017] In one possible implementation, the processing module is specifically configured to control the high-voltage driving circuit to provide a high-voltage driving signal of a first frequency to the mutual capacitance data transmission channel of the display substrate; control the first multiplexing module and the first sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; and control the second multiplexing module and the second sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; wherein the voltage range of the high-voltage driving signal is 6V to 12V, and the voltage range of the medium-low voltage driving signal is 3V to 6V.

[0018] In one possible implementation, the first frequency ranges from 60 Hz to 480 Hz, and the second frequency ranges from 480 Hz to 720 Hz.

[0019] In one possible implementation, the touch chip further includes a phase-locked loop, a communication interface, and a storage module;

[0020] The phase-locked loop is connected to the processing module and is used to provide timing signals to the processing module;

[0021] The communication interface is connected to the processing module and is used for communication between the touch chip and other devices.

[0022] The storage module is connected to the processing module and is used to store the data of the processing module.

[0023] Secondly, embodiments of this application provide a display, including: a display substrate and any of the touch chips described in the first aspect above;

[0024] The display substrate includes: a first display area and a second display area;

[0025] The first display area includes a self-capacitive channel, which is used to connect to the input terminal of the first multiplexing module of the touch chip;

[0026] The second display area includes a mutual capacitance data transmission channel and a mutual capacitance data receiving channel. The mutual capacitance data transmission channel of the display substrate is used to connect to the output terminal of the high voltage driving circuit of the touch chip; the mutual capacitance data receiving channel of the display substrate is used to connect to the input terminal of the second sensing circuit module of the touch chip.

[0027] In one possible implementation, the display substrate further includes:

[0028] A third display area, wherein the second display area is located between the first display area and the third display area;

[0029] The third display area includes a self-capacitive channel, which is connected to the input terminal of the second multiplexing module of the touch chip.

[0030] In one possible implementation, the number of self-capacitance channels in the first display area is positively correlated with the size of the first display area; the number of self-capacitance channels in the third display area is positively correlated with the size of the third display area.

[0031] Beneficial effects of the embodiments in this application:

[0032] This application provides a touch chip and a display. The touch chip includes: a first multiplexing module, a first sensing circuit module, a first analog-to-digital converter module, a high-voltage driving circuit, a charge pump, a second sensing circuit module, a second analog-to-digital converter module, and a processing module. The first multiplexing module is connected to a self-capacitive channel of a display substrate, and is also connected to the first sensing circuit module. The first sensing circuit module is connected to the analog signal terminal of the first analog-to-digital converter module, and the digital signal terminal of the first analog-to-digital converter module is connected to a first terminal of the processing module. The second terminal of the processing module is connected to a first input terminal of the high-voltage driving circuit. The output terminal of the high-voltage driving circuit is connected to the display substrate. The mutual capacitance data transmission channel of the display substrate is connected; the control terminal of the charge pump is connected to the third terminal of the processing module, and the output terminal of the charge pump is connected to the second input terminal of the high voltage driving circuit; the second sensing circuit module is connected to the mutual capacitance data receiving channel of the display substrate; the second sensing circuit module is also connected to the analog signal terminal of the second analog-to-digital converter module, and the digital signal terminal of the second analog-to-digital converter module is connected to the fourth terminal of the processing module; the processing module is used to control the high voltage driving circuit to provide a first frequency driving signal to the mutual capacitance data transmission channel of the display substrate; and to control the first multiplexing module and the first sensing circuit module to provide a second frequency driving signal to the self-capacitive channel of the display substrate. Compared with the mutual capacitance driving touch technology used in OLED touch displays applied to electronic devices in related technologies, by adopting a driving touch technology that combines self-capacitance and mutual capacitance, zoned touch can be realized, the touch reporting rate in the touch operation area can be improved, and the user's operation needs can be better met.

[0033] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application 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 of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0035] Figure 1 This is a schematic diagram of the mutual capacitance driving touch technology in related technologies;

[0036] Figure 2 This is a schematic diagram of the driving signal-time relationship in the mutual capacitance driving touch technology of related technologies;

[0037] Figure 3 This is a schematic diagram of the driving waveform of the mutual capacitance driving touch technology in related technologies.

[0038] Figure 4 This is a schematic diagram comparing the driving waveforms of mutual capacitance and self-capacitance in related technologies;

[0039] Figure 5 A schematic diagram illustrating the generation principle of self-contained "ghost points" in related technologies;

[0040] Figure 6 This is a schematic diagram of a touch chip structure in related technologies;

[0041] Figure 7a This is a schematic diagram of a first structure of a touch chip provided in an embodiment of this application;

[0042] Figure 7b This is a schematic diagram of a second structure of the touch chip provided in an embodiment of this application;

[0043] Figure 8a This is a schematic diagram of a third structure of the touch chip provided in an embodiment of this application;

[0044] Figure 8b This is a schematic diagram of a high-reporting-rate touch operation area in a game.

[0045] Figure 8c A schematic diagram comparing touch power consumption under different driving methods (simulation);

[0046] Figure 8d This is a schematic diagram illustrating the first example of a switching method for a driver-based touch technology that combines self-capacitance and mutual capacitance.

[0047] Figure 8e This is a schematic diagram illustrating a second example of a switching method for a driver-based touch technology that combines self-capacitance and mutual capacitance.

[0048] Figure 8f Illustration of touch Rawdata update instructions;

[0049] Figure 8g This is a schematic diagram of the coordinate calculation process in the self-capacitance and mutual capacity combined driving touch technology of this application;

[0050] Figure 9 This is a schematic diagram of a fourth structure of the touch chip provided in the embodiments of this application;

[0051] Figure 10 This is a schematic diagram of a first structure of a display provided in an embodiment of this application;

[0052] Figure 11 This is a schematic diagram of a second structure of a display provided in an embodiment of this application;

[0053] Figure 12This is a schematic diagram of a third structure of a display provided in an embodiment of this application. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0055] In related technologies, OLED touch displays used in electronic devices all employ mutual capacitance driving touch technology, such as... Figure 1 As shown, under normal user operation, the highest touch reporting rate of the entire touch display substrate is 480Hz. The structure of the touch chip is as follows: Figure 6 As shown in the diagram, the relationship between the drive signal and time for the TX channel (mutual capacitance data transmission channel) is as follows: Figure 2 As shown. The number of touch channels in the OLED touch display: 20 TX channels and 40 RX channels. TX represents the mutual capacitance data transmission channel, and RX represents the mutual capacitance data reception channel. TX Scan (scan signal) scans from TX0 to TX19, and TX Driving represents the drive signal for the mutual capacitance data transmission channel.

[0056] To prevent ghosting, insensitivity, and false triggering on OLED touch displays, TX typically requires high-voltage driving and more driving pulses. Therefore, the maximum touch reporting rate can only reach 480Hz. The mutual capacitance driving waveform diagram is shown below. Figure 3 As shown.

[0057] Understandably, the distance between the Touch Pattern (touch electrode pattern) of an OLED touch display and the cathode layer of the OLED display driver is ≤12µm, resulting in the Cp loading of the mutual capacitance touch pattern typically being above 400pf. Since the self-capacitive pattern (electrode) is a separate small unit, its Cp loading is typically around 50pf.

[0058] Therefore, when performing mutual capacitance driving, to ensure a high signal-to-noise ratio, a high-voltage drive (6V-12V) is typically used, and the number of drive pulses is usually greater than or equal to 64. When performing self-capacitance driving, a medium-voltage or even low-voltage drive (3V-6V) is used, and the number of drive pulses is less than or equal to 15, which is sufficient to guarantee a adequate signal-to-noise ratio. A comparison diagram of the drive waveforms for mutual capacitance and self-capacitance is shown below. Figure 4 As shown. Figure 4In the example, when performing mutual capacitance driving, a high voltage drive (9V) is used, the touch reporting rate is 480Hz, and the scan time is 6ms; when performing self-capacitance driving, a medium-low voltage drive (6V) is used, the touch reporting rate is 480Hz, and the scan time is 1.5ms.

[0059] In summary, under the same signal-to-noise ratio, the power consumption of self-capacitive drive is basically 50% of that of mutual capacitive drive; self-capacitive drive has a short time and the touch reporting rate can reach 720Hz.

[0060] To more clearly explain the difference between self-capacitive and mutual-capacitive touch technologies, the following is a brief explanation of the concepts of self-capacitive and mutual-capacitive.

[0061] An array of horizontal and vertical electrodes is fabricated on the glass surface using ITO (indium tin oxide, a transparent conductive material). These horizontal and vertical electrodes form a capacitance with ground, which is commonly referred to as self-capacitance, or the capacitance of the electrode to ground. When a finger touches the capacitive screen, the capacitance of the finger is superimposed on the capacitance of the screen, increasing the capacitance of the screen.

[0062] During touch detection, the self-capacitive touch sensor sequentially detects the horizontal and vertical electrode arrays. Based on the change in capacitance before and after the touch, it determines the horizontal and vertical coordinates respectively, and then combines them into planar touch coordinates. The self-capacitive scanning method is equivalent to projecting the touch point on the touch screen onto the X and Y axes respectively, then calculating the coordinates in the X and Y axes respectively, and finally combining them into the coordinates of the touch point.

[0063] If it's a single-point touch, the projections in both the X and Y axes are unique, resulting in unique coordinates. If there are two touches on the touchscreen, and these two points are not in the same X or Y direction, then there are two projections in both the X and Y directions, resulting in four coordinates. Clearly, only two coordinates are real; the other two are what are commonly known as "ghost points," such as... Figure 5 As shown, when the "circular dots" are touched simultaneously, the capacitances of electrodes Y0, Y2, and X1, X3 change. Because the "cross points" use the same electrode, the controller cannot find the correct touch coordinates. Therefore, self-capacitance cannot achieve true multi-touch.

[0064] Mutual capacitance touch also uses ITO to create horizontal and vertical electrodes on the glass surface. The difference between it and self-capacitive touch is that a capacitor is formed at the intersection of the two sets of electrodes; that is, the two sets of electrodes constitute the two poles of a capacitor. When a finger touches the capacitive screen, it affects the coupling between the two electrodes near the touch point, thus changing the capacitance between them. To detect the mutual capacitance, the horizontal electrodes sequentially emit excitation signals, while all the vertical electrodes simultaneously receive signals. This allows us to obtain the capacitance values ​​at all intersections of the horizontal and vertical electrodes, i.e., the capacitance of the entire two-dimensional plane of the touchscreen. Based on the change in the two-dimensional capacitance of the touchscreen, the coordinates of each touch point can be calculated. Therefore, even with multiple touch points on the screen, the true coordinates of each touch point can be calculated.

[0065] The internal architecture of TIC (touch chip) in related technologies, such as Figure 6 As shown, the system includes a sensing circuit module, an analog-to-digital converter module, a high-voltage drive circuit, a charge pump, a processing module, a phase-locked loop, a storage module, a communication interface, a first voltage regulator, a second voltage regulator, a third voltage regulator, a first oscillator, and a second oscillator. The high-voltage drive circuit is connected to the mutual capacitance data transmission channels (TX0-TX19) of the display area in the display substrate, and the sensing circuit module is connected to the mutual capacitance data receiving channels (RX0-RX39) of the display area in the display substrate.

[0066] Figure 6 The touch chips shown typically only achieve a uniform reporting rate across the entire area (maximum reporting rate 480Hz), and cannot achieve zoned touch. Therefore, how to drive a self-capacitive and mutually capacitive integrated touch chip to achieve zoned touch becomes the key to solving the above problem.

[0067] In order to combine self-capacitive touch technology with mutual-capacitive touch technology and leverage their respective advantages to achieve zoned touch control, this application provides a touch chip and a display.

[0068] Next, a touch chip 1 provided in the embodiments of this application will be described in detail. See [link to relevant documentation]. Figure 7a The touch chip 1 includes:

[0069] First multiplexing module 11, first sensing circuit module 12, first analog-to-digital converter module 13, high voltage drive circuit 14, charge pump 15, second sensing circuit module 17, second analog-to-digital converter module 18, processing module 19;

[0070] The first multiplexing module 11 is connected to the self-contained channel of the display substrate 2, and the first multiplexing module 11 is also connected to the first sensing circuit module 12; the first sensing circuit module 12 is connected to the analog signal terminal of the first analog-to-digital converter module 13, and the digital signal terminal of the first analog-to-digital converter module 13 is connected to the first terminal of the processing module 19.

[0071] The second terminal of the processing module 19 is connected to the first input terminal of the high-voltage driving circuit 14; the output terminal of the high-voltage driving circuit 14 is connected to the mutual capacitance data transmission channel of the display substrate 2; the control terminal of the charge pump 15 is connected to the third terminal of the processing module 19; and the output terminal of the charge pump 15 is connected to the second input terminal of the high-voltage driving circuit 14.

[0072] The second sensing circuit module 17 is connected to the mutual capacitance data receiving channel of the display substrate 2; the second sensing circuit module 17 is also connected to the analog signal terminal of the second analog-to-digital converter module 18, and the digital signal terminal of the second analog-to-digital converter module 18 is connected to the fourth terminal of the processing module 19.

[0073] The processing module 19 is used to control the high-voltage driving circuit 14 to provide a first frequency driving signal to the mutual capacitance data transmission channel of the display substrate 2; and to control the first multiplexing module 11 and the first sensing circuit module 12 to provide a second frequency driving signal to the self-capacitive channel of the display substrate 2.

[0074] The processing module 19 uses the high-voltage drive circuit 14 to provide a first-frequency drive signal to the mutual capacitance data transmission channel of the display substrate 2. It also uses the second sensing circuit module 17 and the second analog-to-digital converter module 18 to detect the touch signals of the mutual capacitance data transmission channel and the mutual capacitance data receiving channel. The specific process can be found in the driving and detection processes in related technologies, and will not be repeated here. The charge pump 15 is used to provide a voltage signal of a specified amplitude. The first multiplexing module 11 can be a data selector (MUX, Multiplexer), also called a multiplexer or multiplexer switch, and its main function is for signal switching. The first sensing circuit module 12 includes multiple sensing circuits. Considering the area and cost of the touch chip, the number of sensing circuits in the first sensing circuit module 12 is less than the number of self-capacitive channels in the display substrate. Therefore, it is necessary to add the first multiplexing module 11 to realize the connection switching between the sensing circuits and different self-capacitive channels, thereby achieving driving and sensing of each self-capacitive channel in the time domain. The first analog-to-digital converter module 13 may include multiple analog-to-digital converters for converting digital signals to analog signals between the processing module 19 and the first sensing circuit module 12. The processing module 19 controls the first multiplexing module 11 and the first sensing circuit module 12 to provide a second frequency driving signal to the self-capacitive channel of the display substrate 2, and is also used to detect touch signals of the self-capacitive channel.

[0075] The touch chip in this embodiment can achieve zoned touch by using a driving touch technology that combines self-capacitance and mutual capacitance. High-frequency touch reporting can be achieved through the driving and detection of the self-capacitance channel, and low-frequency touch reporting can be achieved through the mutual capacitance data transmission channel and the mutual capacitance data receiving channel. This can improve the touch reporting rate of the specified touch operation area and better meet the user's operation needs.

[0076] In one possible implementation, see Figure 7b The input terminal of the first multiplexing module 11 is connected to the respective accommodating channel of the first display area in the display substrate 2.

[0077] In one possible implementation, see Figure 7b The input terminal of the second sensing circuit module 17 is connected to each mutual capacitance data receiving channel of the second display area in the display substrate 2, and the output terminal of the high voltage driving circuit 14 is connected to each mutual capacitance data transmission channel of the second display area in the display substrate 2.

[0078] In one possible implementation, the first sensing circuit module 12 includes x sensors, and the first multiplexing module 11 is 1: Multiplexing module; where n is the number of self-contained channels in the first display area of ​​the display substrate.

[0079] and Figure 6 Compared to the previous method, this method adds self-capacitive touch control. The input terminal of the first multiplexing module is connected to the respective capacitive channels of the first display area in the display substrate. An additional first sensing circuit module and a first analog-to-digital converter (ADC) module are added. The first multiplexing module is connected to the first sensing circuit module; the analog signal terminal of the first sensing circuit module is connected to the analog signal terminal of the first ADC module, and the digital signal terminal of the first ADC module is connected to the first terminal of the processing module. The number of sensors included in the first sensing circuit module can be set according to the actual situation of the touch chip; in one example, the first sensing circuit module may include 40 sensors. The number of ADCs included in the first ADC module can be set according to the actual situation of the touch chip; in one example, the first ADC module may include 20 ADCs.

[0080] In one example, if the self-capacitive channels of the first display area in the display substrate are S200 to S399 (200), the first sensing circuit module includes 40 sensors, and the self-capacitive channels of the first display area and the first sensing circuit module can be designed with a Mux 1:5 ratio (the algorithm here is rounded up).

[0081] The touch reporting rate of the display area corresponding to the mutual capacitance channel of the display substrate can be up to 480Hz, and the touch reporting rate of the display area corresponding to the self-capacitance channel of the display substrate can be up to 720Hz.

[0082] In one example, the processing module may include SRAM (Static Random-Access Memory), PEN (a type of load balancer), and CPU (central processing unit).

[0083] In this embodiment, compared with the mutual capacitance driving touch technology used in OLED touch displays for electronic devices in related technologies, the use of a driving touch technology that combines self-capacitance and mutual capacitance can achieve zoned touch, improve the touch reporting rate in the touch operation area, and better meet the user's operation needs.

[0084] In some scenarios, multiple areas require high-frequency reporting, for example... Figure 8b The game scene shown includes game buttons on both the left and right sides of the horizontal screen, thus requiring high-frequency reporting. Therefore, a second multiplexing module can be added to the touch chip 1, allowing high-frequency reporting for the two areas to be achieved through the first and second multiplexing modules respectively. In one possible implementation, see... Figure 8a The touch chip 1 also includes a second multiplexing module 16;

[0085] The input terminal of the second multiplexing module 16 is connected to the self-contained channel of the display substrate 2, and the output terminal of the second multiplexing module 16 is connected to the input terminal of the second sensing circuit module 17.

[0086] The processing module 19 is also used to control the second multiplexing module 16 and the second sensing circuit module 17 to provide a second frequency driving signal to the self-capacitive channel of the display substrate 2.

[0087] In one possible implementation, the input terminal of the second multiplexing module 16 is connected to the respective accommodating channel of the third display area in the display substrate 2.

[0088] In one possible implementation, the second sensing circuit module 17 includes y sensors, and the second multiplexing module 16 is 1: Multiplexing module; where m is the number of self-contained channels in the third display area of ​​the display substrate.

[0089] The number of sensors included in the second sensing circuit module can be set according to the actual situation of the touch chip. In one example, the second sensing circuit module may include 40 sensors. The number of analog-to-digital converters included in the second analog-to-digital converter module can be set according to the actual situation of the touch chip. In one example, the second analog-to-digital converter module may include 20 analog-to-digital converters.

[0090] In one possible implementation, the first frequency ranges from 60 Hz to 480 Hz, and the second frequency ranges from 480 Hz to 720 Hz.

[0091] In a display substrate, the self-capacitance channels of the third display area share a second sensing circuit module with the mutual capacitance data receiving channel RX. In one example, if the self-capacitance channels of the third display area in the display substrate are S0 to S199 (200), the second sensing circuit module includes 40 sensors, and the self-capacitance channels of the third display area and the second sensing circuit module can adopt a Mux 1:5 design.

[0092] The following explanation uses a game interface as an example. When users play games on electronic devices, the touch sampling rate is limited to 480Hz (touch response time is 2.1ms), which cannot meet the higher operational demands of users. Furthermore, because the touchscreen enters a high refresh rate (120Hz) and high touch sampling rate (480Hz) state across the entire screen, the power consumption is enormous, resulting in very rapid battery drain (typically 2 hours of charging for only 1 hour of gameplay). Users are forced to play while charging, leading to a poor gaming experience. However, the touch operation area in the game interface is localized; not all areas require a high touch sampling rate. Figure 8b As shown. Therefore, according to Figure 8a The touch chip design uses a mutual capacitance driving method in the central area of ​​the display substrate and a self-capacitive driving method at both ends. This allows the three areas to use different driving methods and different methods of acquiring and sensing data, which are then transmitted to the MCU (Microcontroller Unit) for unified processing.

[0093] Since the three areas mentioned above have their own signal transmission channels, the touch chip can control the driving in different modes. It can achieve a mode where the sides are driven and the middle is not driven, or a mode where the top is driven and the other areas are not driven. By partitioning and controlling the touch reporting rate of the touch operation area and the non-touch operation area, the power consumption of touch is reduced.

[0094] like Figure 8c The diagram shows a comparison of touch power consumption under different driving methods (simulation). For example, using a driving touch technology that combines self-capacitance and mutual capacitance, the touch operation area (both sides) achieves a touch reporting rate of 720Hz, while the touch reporting rate of other non-touch operation areas (the middle area) is 60Hz, resulting in a touch response speed of 1.4ms (1 / 720Hz). This ensures an extremely fast gaming experience. Furthermore, compared to the mutual capacitance driving touch technology used in OLED touch displays for electronic devices, this technology can reduce the overall touch power consumption of the touch chip (by 41.9%).

[0095] Therefore, considering the impact of the bezel, by adopting a driving touch technology that combines self-capacitance and mutual capacitance, zoned touch can be achieved, which improves the touch reporting rate in the touch operation area and better meets the user's operation needs.

[0096] In one example, the touch reporting rate of the touch operation area can reach 720Hz (touch response speed is 1.4ms). The display screen will enter the high display refresh rate (140Hz, ensuring smooth game display) state of the touch operation area, and the touch reporting rate will also enter the high touch reporting rate 720Hz state of the touch operation area (the higher the reporting rate, the faster the touch response speed, and the faster the device skill release, shooting speed, etc. will be), ensuring the ultimate gaming experience.

[0097] The following explains the switching method of the combined self-capacitance and mutual capacitance driving touch technology. An example is provided: the touch reporting rate in the touch operation area is 720Hz, and the touch reporting rate in the non-touch operation area is 480Hz. Figure 8d As shown.

[0098] (1) Perform full-area mutual capacitance driven scanning and self-capacitance driven scanning on Frame 1-Frame 2: Noise Detect → Mutual capacitance scanning → Self-capacitance scanning;

[0099] (2) After Frame2 ends, configure the driver switching setting: Disable mutual capacity area (do not perform mutual capacity);

[0100] (3) Frame3 driving method: only self-capacitive driving scan is performed;

[0101] (4) After the Fram3 driver is completed, perform driver switching settings again: Enable mutual capacitance area (perform mutual capacitance);

[0102] (5) Repeat steps (1)-(4) to drive the vehicle repeatedly.

[0103] In some scenarios, the driver's intermediate area can achieve a reporting rate of 120Hz or lower (mainly to reduce touch power consumption). This can be configured according to the actual setup. Figure 8e As shown (the touch reporting rate of the touch operation area is 720Hz, and the touch reporting rate of the non-touch operation area is 120Hz).

[0104] Based on the driving principle, the update description for each frame of touch raw data is as follows:

[0105] Taking a touch reporting rate of 720Hz for the touch operation area and 480Hz for the non-touch operation area as an example, the following explanation is provided: Figure 8f As shown.

[0106] Full-area update of raw data (unprocessed raw image data) for Frame 1 and Frame 2:

[0107] (1) Signal processing is calculated separately based on mutual and self-capacitance regions;

[0108] (2) Coordinate calculation, as in related technologies, Figure 8g This is a flowchart illustrating the coordinate calculation process in a touch technology that combines self-capacitance and mutual capacitance. The left side shows the coordinate calculation process in related technologies, while the right side shows the coordinate calculation process for touch reporting rate zoning control.

[0109] Frame3 updates 720Hz region data immediately:

[0110] (1) To update the 720Hz region Raw data, Raw data needs to be moved. Since the touch reporting rates of the region and the updated region are different, the Raw data of the region needs to be moved into the Buffer area inside the touch chip first. When the coordinates need to be calculated, the Raw data of the Buffer area needs to be moved out again. The Raw data of different regions need to be calculated together.

[0111] (2) Signal processing self-contained area;

[0112] (3) Using full-area Raw data, coordinate calculation is performed as described in related techniques, such as... Figure 8g As shown.

[0113] In the embodiments of this application, by adopting a driving touch technology that combines self-capacitance and mutual capacitance, zoned touch can be realized, which improves the touch reporting rate in the touch operation area and reduces touch power consumption while meeting the user's higher operation requirements.

[0114] In one possible implementation, the processing module 19 is specifically configured to control the high-voltage driving circuit to provide a high-voltage driving signal of a first frequency to the mutual capacitance data transmission channel TX of the display substrate; control the first multiplexing module and the first sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; and control the second multiplexing module and the second sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; wherein the voltage range of the high-voltage driving signal is 6V to 12V, and the voltage range of the medium-low voltage driving signal is 3V to 6V.

[0115] In this embodiment, the processing module provides a high-voltage driving signal of a first frequency for the mutual capacitance data transmission channel TX of the display substrate, and a medium-low voltage driving signal of a second frequency for the self-capacitive channel of the display substrate.

[0116] In one possible implementation, see Figure 9 The touch chip 1 also includes a phase-locked loop 11', a communication interface 12', and a storage module 13';

[0117] The phase-locked loop 11' is connected to the processing module 19 and is used to provide timing signals to the processing module 19;

[0118] The communication interface 12' is connected to the processing module 19 and is used for communication between the touch chip 1 and other devices;

[0119] The storage module 13' is connected to the processing module 19 and is used to store the data of the processing module 19.

[0120] In one example, the communication interface could be SPI (Serial Peripheral Interface), or it could be I2C (Inter Integrated Circuit, a bidirectional two-wire synchronous serial bus), I3C (Improved Inter Integrated Circuit, an upgraded version of I2C), GPIO (General-purpose input / output), etc.

[0121] In one example, the storage module may include BGP (Border Gateway Protocol), POR (Reset), and OSC (Oscillator).

[0122] In one example, such as Figure 9 As shown, the touch chip also includes a first voltage regulator, a second voltage regulator, a third voltage regulator, a first oscillator, and a second oscillator. It is understood that the voltage values ​​of each voltage regulator can be set according to the actual voltage requirements of each module in the touch chip. In one example, the output voltage of the first voltage regulator is 2.7V, the output voltage of the second voltage regulator is 1.2V, and the output voltage of the third voltage regulator is 1.8V. Similarly, it is understood that the clock frequencies of each oscillator also need to be set according to the actual frequency requirements of each module in the touch chip. In one example, the clock frequency of the first oscillator is 150MHz, and the clock frequency of the second oscillator is 2MHz.

[0123] In this embodiment, the phase-locked loop provides timing signals for the processing module; the communication interface provides communication between the touch chip and other devices; and the storage module provides data storage for the processing module.

[0124] This application also provides a display, see [link to relevant documentation] Figure 10 It includes: a display substrate 2 and a touch chip 1 as described in any of the above embodiments;

[0125] The display substrate 2 includes: a first display area 21 and a second display area 22;

[0126] The first display area 21 includes a self-capacitive channel, which is used to connect to the input terminal of the first multiplexing module 11 of the touch chip 1.

[0127] The second display area 22 includes a mutual capacitance data transmission channel TX and a mutual capacitance data receiving channel RX. The mutual capacitance data transmission channel TX of the display substrate 2 is used to connect to the output terminal of the high voltage driving circuit 14 of the touch chip 1; the mutual capacitance data receiving channel RX of the display substrate 2 is used to connect to the input terminal of the second sensing circuit module 17 of the touch chip 1.

[0128] The specific analysis is the same as above, and will not be repeated here.

[0129] In one possible implementation, see Figure 11 The display substrate 2 further includes:

[0130] The third display area 23, and the second display area 22 is located between the first display area 21 and the third display area 23;

[0131] The third display area 23 includes a self-capacitive channel, which is connected to the input terminal of the second multiplexing module 16 of the touch chip 1.

[0132] The specific analysis is the same as above, and will not be repeated here.

[0133] In one possible implementation, the number of self-contained channels in the first display area 21 is positively correlated with the size of the first display area 21; the number of self-contained channels in the third display area 23 is positively correlated with the size of the third display area 23.

[0134] The specific analysis is the same as above, and will not be repeated here.

[0135] The following example uses a 6.67-inch mobile phone display. The dimensions of a 6.67-inch mobile phone display are 158mm × 73mm. Dividing this display into three equal areas (first display area, second display area, and third display area), each area is 53mm × 73mm. With a self-capacitive channel pitch of 5mm, the first and third display areas each require 10 x 14 self-capacitive channels (i.e., 140 self-capacitive channels). The first sensing circuit module in the touch chip 1 can include 40 sensors, and the first analog-to-digital converter module can include... The first multiplexing module can be a 1:5 multiplexing module, which includes 20 analog-to-digital converters. Therefore, the first multiplexing module can support up to 200 self-capacitive channels, which is sufficient for the 140 self-capacitive channels in the first display area. Similarly, the second sensing circuit module in the touch chip 1 can include 40 sensors, the second analog-to-digital converter module can include 20 analog-to-digital converters, and the second multiplexing module can be a 1:5 multiplexing module. Therefore, the second multiplexing module can support up to 200 self-capacitive channels, which is sufficient for the 140 self-capacitive channels in the third display area.

[0136] like Figure 12 The diagram shown is a third structural schematic of the display provided in the embodiments of this application. The left side is a physical schematic of the display substrate, and the right side, indicated by the dashed box, is an enlarged schematic of the touch chip (TIC, Touch Integrated Circuit).

[0137] The display can be applied to mobile phones, tablets, or other electronic devices, and this application does not make any specific limitations on it.

[0138] In this embodiment, zoned touch control of the display substrate in the display is realized, which improves the touch reporting rate in the touch operation area and better meets the user's operation needs.

[0139] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0140] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0141] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A display, characterized in that, include: Display substrate and touch chip; The display substrate includes: a first display area, a second display area, and a third display area; The touch chip includes: a first multiplexing module, a first sensing circuit module, a first analog-to-digital converter module, a high-voltage drive circuit, a charge pump, a second sensing circuit module, a second analog-to-digital converter module, a processing module, and a second multiplexing module; The first display area includes a self-capacitive channel, which is used to connect to the input terminal of the first multiplexing module of the touch chip; The second display area includes a mutual capacitance data transmission channel and a mutual capacitance data receiving channel. The mutual capacitance data transmission channel of the display substrate is used to connect to the output terminal of the high voltage driving circuit of the touch chip; the mutual capacitance data receiving channel of the display substrate is used to connect to the input terminal of the second sensing circuit module of the touch chip. The second display area is located between the first display area and the third display area; The third display area includes a self-capacitive channel, and the self-capacitive channel of the third display area is connected to the input terminal of the second multiplexing module of the touch chip; The self-capacitive channel of the third display area and the mutual-capacitive data receiving channel of the second display area share the second sensing circuit module; The first multiplexing module is connected to the self-capacitive channel of the display substrate, and the first multiplexing module is also connected to the first sensing circuit module; the first sensing circuit module is connected to the analog signal terminal of the first analog-to-digital converter module, and the digital signal terminal of the first analog-to-digital converter module is connected to the first terminal of the processing module. The second terminal of the processing module is connected to the first input terminal of the high-voltage driving circuit; the output terminal of the high-voltage driving circuit is connected to the mutual capacitance data transmission channel of the display substrate; the control terminal of the charge pump is connected to the third terminal of the processing module, and the output terminal of the charge pump is connected to the second input terminal of the high-voltage driving circuit. The second sensing circuit module is connected to the mutual capacitance data receiving channel of the display substrate; the second sensing circuit module is also connected to the analog signal terminal of the second analog-to-digital converter module, and the digital signal terminal of the second analog-to-digital converter module is connected to the fourth terminal of the processing module. The input terminal of the second multiplexing module is connected to the self-capacitive channel of the display substrate, and the output terminal of the second multiplexing module is connected to the input terminal of the second sensing circuit module. The processing module is configured to control the high-voltage driving circuit to provide a first frequency driving signal to the mutual capacitance data transmission channel of the display substrate; control the first multiplexing module and the first sensing circuit module to provide a second frequency driving signal to the self-capacitive channel of the display substrate; and control the second multiplexing module and the second sensing circuit module to provide a second frequency driving signal to the self-capacitive channel of the display substrate.

2. The display according to claim 1, characterized in that, The number of self-capacitance channels in the first display area is positively correlated with the size of the first display area; the number of self-capacitance channels in the third display area is positively correlated with the size of the third display area.

3. The display according to claim 1, characterized in that, The input terminal of the first multiplexing module is connected to the respective accommodating channel of the first display area in the display substrate, and the input terminal of the second multiplexing module is connected to the respective accommodating channel of the third display area in the display substrate. The input terminal of the second sensing circuit module is connected to each mutual capacitance data receiving channel of the second display area in the display substrate, and the output terminal of the high voltage driving circuit is connected to each mutual capacitance data transmission channel of the second display area in the display substrate.

4. The display according to claim 3, characterized in that, The first sensing circuit module includes x sensors, and the first multiplexing module is... Multiplexing module; the second sensing circuit module includes y sensors, and the second multiplexing module is A multiplexing module, wherein n is the number of self-capacitive channels in the first display area of ​​the display substrate, and m is the number of self-capacitive channels in the third display area of ​​the display substrate.

5. The display according to claim 1, characterized in that, The processing module is specifically configured to control the high-voltage driving circuit to provide a high-voltage driving signal of a first frequency to the mutual capacitance data transmission channel of the display substrate; control the first multiplexing module and the first sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; and control the second multiplexing module and the second sensing circuit module to provide a medium-low voltage driving signal of a second frequency to the self-capacitive channel of the display substrate; wherein the voltage range of the high-voltage driving signal is 6V to 12V, and the voltage range of the medium-low voltage driving signal is 3V to 6V.

6. The display according to claim 1, characterized in that, The first frequency ranges from 60Hz to 480Hz, and the second frequency ranges from 480Hz to 720Hz.

7. The display according to claim 1, characterized in that, The touch chip also includes a phase-locked loop, a communication interface, and a storage module; The phase-locked loop is connected to the processing module and is used to provide timing signals to the processing module; The communication interface is connected to the processing module and is used for communication between the touch chip and other devices. The storage module is connected to the processing module and is used to store the data of the processing module.

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