Driving circuit, driving method and touch display device

Abstract

The application belongs to the technical field of display driving, and particularly relates to a driving circuit, a driving method and a touch display device. The driving circuit comprises a power module configured to provide a reference common voltage; a control module configured to determine a target touch sensing block requiring voltage compensation according to picture display information, and generate a compensation control signal corresponding to the target touch sensing block; at least one compensation module configured to compensate the reference common voltage according to the compensation control signal to obtain a target common voltage; and at least one switch module configured to apply the target common voltage to a common electrode of the target touch sensing block under the control of the control module. Through the cooperative work of the control module, the compensation module and the switch module, the application realizes the improvement of the horizontal line compensation precision while effectively avoiding the increase of hardware cost and the rise of system complexity.

Description

Technical Field

[0001] This disclosure belongs to the field of display driver technology, and specifically relates to a driving circuit, driving method and touch display device. Background Technology

[0002] With the continuous development of display technology, in-cell touch technology has been widely used in various liquid crystal display devices because it can achieve thinner module thickness and narrower bezels. However, the structural characteristic of this technology, which shares the touch sensor and the display common electrode (VCOM), can easily lead to the problem of touch sensor horizontal lines when displaying certain images.

[0003] To improve horizontal stripes, related technologies have proposed adding a short-circuit transistor array around the panel to temporarily short-circuit all sensor blocks to reduce the impedance of the common electrode loop. However, this solution requires an additional level conversion module to control the short-circuit transistors, which increases material costs and circuit complexity. In addition, the compensation method is fixed, resulting in limited improvement in the central area of ​​the panel and insufficient compensation accuracy.

[0004] Therefore, how to improve the accuracy of ripple compensation while avoiding additional hardware costs and reducing system complexity has become an urgent technical problem to be solved. Summary of the Invention

[0005] This application provides a driving circuit, driving method, and touch display device. Through the coordinated operation of a control module, a compensation module, and a switching module, this application effectively avoids increasing hardware costs and system complexity while improving the accuracy of horizontal stripe compensation.

[0006] In a first aspect, this application provides a driving circuit applied to a touch display panel, the touch display panel including multiple touch sensing blocks, each touch sensing block corresponding to a common electrode, the driving circuit including: a power supply module configured to provide a reference common voltage; a control module configured to determine a target touch sensing block requiring voltage compensation based on screen display information, and generate a compensation control signal corresponding to the target touch sensing block; at least one compensation module connected to the control module and the power supply module, configured to compensate the reference common voltage according to the compensation control signal to obtain a target common voltage; and at least one switching module connected to the control module, the compensation module and the common electrode, configured to: apply the target common voltage to the common electrode of the target touch sensing block under the control of the control module.

[0007] Optionally, the touch display panel includes M columns of touch sensing arrays, each column including N touch sensing blocks; the at least one compensation module includes M compensation modules, each corresponding to one column of touch sensing arrays, and is configured to provide an independent target common voltage for the corresponding column of touch sensing arrays; the at least one switching module includes M×N switching modules, each switching module connected between a touch sensing block and the compensation module corresponding to its column; wherein, the control module is further configured to group the compensation control signals by column, and apply the target common voltage output by the m-th compensation module to the selected target touch sensing block in the m-th column by time-division control of the conduction state of the N switching modules in the m-th column.

[0008] Optionally, the driving circuit further includes: M power amplifiers, the input terminal of each power amplifier being connected to the output terminal of the power module, and the output terminal of each power amplifier being connected to the output terminal of a compensation module.

[0009] Optionally, the switching module includes: a switching transistor, the control terminal of the switching transistor being connected to the control module, the first terminal of the switching transistor being connected to the output terminal of the compensation module, and the second terminal of the switching transistor being connected to the common electrode corresponding to the touch sensing area.

[0010] Optionally, the compensation module includes: a power amplifier, the input terminal of which is connected to the compensation signal output terminal of the control module; and a compensation capacitor, the first terminal of which is connected to the output terminal of the power amplifier, and the second terminal of which serves as the output terminal of the compensation module.

[0011] Optionally, the compensation module further includes: a first resistor, the first end of which is connected to the output terminal of the power amplifier, and the second end of which is connected to the first end of the compensation capacitor; a second resistor, the first end of which is connected to the inverting input terminal of the power amplifier, and the second end of which is connected to the second end of the compensation capacitor; wherein the non-inverting input terminal of the power amplifier is connected to the compensation signal output terminal of the control module; and a third resistor, the first end of which is connected to the first end of the second resistor, and the second end of which is grounded.

[0012] Secondly, this application provides a driving method applied to a touch display panel, the touch display panel including a plurality of touch sensing blocks, each touch sensing block corresponding to a common electrode, the driving method including: determining at least one target touch sensing block requiring voltage compensation based on the screen information of the current display screen; determining a compensation timing sequence corresponding to the target touch sensing block based on the counting of a clock control signal; and selectively compensating the voltage of the common electrode of the target touch sensing block in response to the compensation timing sequence.

[0013] Optionally, determining at least one target touch sensing block requiring voltage compensation based on the screen information of the currently displayed screen includes: detecting the current displayed screen and obtaining the current screen type; if the current screen type is a preset screen type, obtaining the screen information of the current displayed screen; wherein the preset screen type includes a flicker detection screen type and a sub-pixel switch screen type; the screen information includes the polarity arrangement and grayscale distribution of pixels; and determining at least one target touch sensing block whose coupling voltage difference exceeds a preset threshold based on the screen information and the positional relationship of the plurality of touch sensing blocks in the touch display panel.

[0014] Optionally, determining the compensation timing sequence corresponding to the target touch sensing block based on the counting of the clock control signal includes: obtaining a compensation start count value and a compensation end count value corresponding to the target touch sensing block based on the synchronization relationship between the clock control signal and the gate scan signal of the touch display panel, and the row position mapping relationship of the target touch sensing block on the panel; counting the pulse edges of the clock control signal during display to obtain a real-time count value; generating a timing trigger signal to start compensation when the real-time count value reaches the compensation start count value corresponding to the target touch sensing block; and generating a timing shutdown signal to end compensation when the real-time count value reaches the compensation end count value corresponding to the target touch sensing block. The timing trigger signal and the timing shutdown signal constitute the compensation timing sequence.

[0015] Optionally, in response to the compensation timing sequence, selective compensation is performed on the common electrode voltage of the target touch sensing block, including: generating a compensation control signal corresponding to the target touch sensing block during the effective period of the compensation timing sequence; wherein the compensation control signal includes a compensation direction and a compensation amplitude; compensating the reference common voltage according to the compensation control signal to obtain a target common voltage; and applying the target common voltage to the target touch sensing block so that the common voltage between different pixel rows within the target touch sensing block is within a preset range.

[0016] Thirdly, this application provides a touch display device, the touch display device comprising: a touch display panel including a plurality of touch sensing blocks, each touch sensing block corresponding to a common electrode; and a driving circuit electrically connected to each common electrode, configured to: during the display phase, compensate the common voltage corresponding to the touch sensing block requiring voltage compensation according to the screen display information on the touch display panel.

[0017] The technical solution provided in this application has at least the following beneficial effects:

[0018] This application achieves intelligent triggering and precise positioning of compensation by using a control module to determine the target touch-sensing block based on the information displayed on the screen. Then, the compensation module compensates the reference common voltage output by the power module according to the compensation control signal, generating a target common voltage that matches the coupling characteristics of the specific block, thus achieving precise adjustment of the compensation amount. Finally, under the control of the control module, the switch module selectively applies the target common voltage to the target common electrode, solving the problem of uneven in-plane compensation caused by the segmentation of the common electrode. Therefore, this application achieves high-precision, adaptive compensation for horizontal lines on touch-sensing blocks through the coordinated work of the control module, compensation module, and switch module. Furthermore, the control module, compensation module, and switch module in this application can be flexibly integrated into the system PCB or existing driver chip without the need for additional short-circuit transistor arrays and independent level conversion modules, thereby significantly improving the accuracy of horizontal line compensation while effectively avoiding increased hardware costs and system complexity. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 The image shown is a schematic diagram of a Flicker screen provided in an embodiment of this application.

[0021] Figure 2 The image shown is a schematic diagram of a Sub-Pixel-OnOff screen provided in an embodiment of this application.

[0022] Figure 3 The diagram shown is a schematic of the horizontal stripe phenomenon of a Touch Sensor provided in an embodiment of this application.

[0023] Figure 4 The diagram shown is a pixel equivalent circuit diagram provided in an embodiment of this application.

[0024] Figure 5 The diagram shown is a voltage coupling schematic provided in an embodiment of this application.

[0025] Figure 6 The diagram shown is a structural schematic of a touch display panel provided in an embodiment of this application.

[0026] Figure 7 The diagram shown is a schematic diagram of the connection between adjacent blocks provided in an embodiment of this application.

[0027] Figure 8 The diagram shown is a schematic diagram of pixel circuit connection of adjacent blocks provided in an embodiment of this application.

[0028] Figure 9 The diagram shown is a waveform diagram of a gate drive signal and a common voltage provided in an embodiment of this application.

[0029] Figure 10 The diagram shown is a schematic representation of a method for changing the polarity arrangement provided by related technologies.

[0030] Figure 11 The diagram shown is a schematic of an approach to adding a shorting transistor, provided by related technologies.

[0031] Figure 12 The diagram shown is a schematic diagram of a driving circuit provided in an embodiment of this application.

[0032] Figure 13 The image shows an embodiment of a driving circuit provided in this application.

[0033] Figure 14 The diagram shows another implementation of the driving circuit provided in this application.

[0034] Figure 15 The diagram shown is a circuit diagram of a compensation module provided in an embodiment of this application.

[0035] Figure 16 The diagram shown is a flowchart of a driving method provided in an embodiment of this application.

[0036] Figure 17 The diagram shown is a flowchart of another driving method provided in an embodiment of this application.

[0037] Figure 18 The diagram shown is a schematic of a GOA driving architecture for a touch display panel provided in an embodiment of this application.

[0038] Figure 19 The figure shown is a schematic diagram of the input and output timing of a level conversion module provided in an embodiment of this application.

[0039] Figure 20 The diagram shown is a schematic diagram of the horizontal stripe timing of adjacent blocks provided in an embodiment of this application.

[0040] Figure 21 The diagram shown is a schematic representation of a method for reducing coupling amplitude according to an embodiment of this application.

[0041] Figure 22 The diagram shown is a schematic diagram of increasing the coupling amplitude provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Drive circuit; 110. Power supply module; 120. Control module; 130. Compensation module; 140. Switch module; 200. Touch display panel;

[0044] U1, power amplifier; U2, power amplifier; R1, first resistor; R2, second resistor; R3, third resistor; C1, compensation capacitor. Detailed Implementation

[0045] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0046] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0047] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0048] In In-cell Touch LCD panels, because the touch sensor and the display common electrode (VCOM) share an electrode structure, the VCOM layer is divided into multiple independent sensor blocks. This structural characteristic leads to issues such as... Figure 1 and Figure 2 When displaying a special image, horizontal stripes, known as "Touch Sensor horizontal lines," often appear at the sensor's edge. The phenomenon is as follows: Figure 3 As shown; where, Figure 1 The image shown is from Flicker. Figure 2 The image shown is a Sub-Pixel-OnOff screen.

[0049] It should be noted that the formation mechanism of these horizontal lines can be attributed to the following two levels of reasons:

[0050] (1) Coupling source: Coupling effect of Data voltage on VCOM.

[0051] Figure 4 The diagram shows the equivalent circuit of a TFT-LCD pixel; in this circuit, the storage capacitor Cst is connected in parallel with the liquid crystal capacitor Clc, and their common terminal is connected to the VCOM electrode. Figure 5 The diagram illustrates the coupling waveform of the Data voltage to the VCOM voltage. It shows the process where, when the polarity of the Data voltage reverses, the coupling effect between the storage capacitor and the liquid crystal capacitor causes a momentary fluctuation in the VCOM voltage. Specifically, when a pixel is refreshed, if the polarity of the Data voltage reverses (e.g., from negative in the previous frame to positive in the current frame), at the instant the pixel transistor T0 is turned on, the Data line charges the storage capacitor Cst and the liquid crystal capacitor Clc through the turned-on pixel transistor T0. Due to the bootstrap effect of the capacitor, the voltage across its terminals cannot change abruptly. The jump in the Data voltage couples to the common electrode (VCOM) through the storage capacitor Cst and the liquid crystal capacitor Clc, causing a momentary fluctuation in the VCOM voltage. In traditional non-In-cell LCDs, the VCOM electrode is a continuous unit, and this coupling effect occurs uniformly throughout the entire display area, thus not causing visual differences or horizontal lines.

[0052] (2) Causes of coupling differences: uneven VCOM recovery caused by in-cell structure.

[0053] Figure 6 This section describes the connection relationships between the Touch Sensor blocks, Tx connection traces, and VCOM voltage source during the display of the In-cell Touch panel. Each Touch Sensor acts as an independent VCOM electrode block, connected to the touch driver IC via its own Tx traces, and then uniformly connected to the VCOM power supply through the internal circuitry of the IC. Figure 7 This is a schematic diagram of the in-plane local circuit at the connection point of two adjacent TouchSensor blocks (row k and row k+1); Figure 8This is a schematic diagram showing the equivalent connection of the pixel circuits of the last row and the first row of adjacent Touch Sensor blocks (row k and row k+1). TX This indicates the resistance of the Tx trace; Figure 9 This is a waveform timing diagram of the gate drive signal and the corresponding VCOM voltage for adjacent Touch Sensor blocks (row k and row k+1).

[0054] This combination Figures 7 to 9 Taking the adjacent k-th and k+1-th row sensors as examples, the reasons for the coupling difference are analyzed as follows:

[0055] (1) Coupling differences caused by timing differences within the sensor: When the gate lines G(n) to G(n+3) of the sensor in row k are turned on sequentially, the polarity reversal of the Data voltage will couple and cause fluctuations in the VCOM voltage of the sensor; due to the resistance R of the Tx trace TX The speed at which the VCOM voltage recovers from fluctuations will be affected. The VCOM at the location of a pixel that is farther away from the input terminal of the Tx trace (such as G(n+3)) will recover its voltage slower than that of a pixel that is closer to the input terminal (such as G(n)).

[0056] (2) Uneven coupling between sensors: The VCOM fluctuation of the k-th row sensor will couple to the VCOM of the adjacent k+1-th row sensor through its Tx trace and the common path inside the touch driver IC. Due to the existence of Tx trace impedance, the magnitude of this mutual coupling will also differ between the two sensors.

[0057] (3) Direct manifestation of horizontal stripes: The combined result of the above differences leads to different effective values ​​of the actual common voltage borne by pixels in different rows within the same sensor. For example, in the k-th row of the sensor, the pixel voltage (Vp-Vcom) corresponding to the later-activated pixel rows (such as G(n+1) to G(n+3)) will be higher than that of the earlier-activated pixel rows (such as G(n)). The difference in pixel voltage directly translates into a difference in liquid crystal transmittance, which visually manifests as the last few rows of pixels in the sensor block being brighter, forming a horizontal bright stripe. Conversely, when the polarity of the Data voltage changes from positive to negative, the difference in recovery speed will also cause the last few rows of pixels to be darker, forming a dark stripe.

[0058] In summary, the inherent segmented VCOM electrode blocks of the In-cell Touch structure, along with the Tx trace impedance connecting these blocks, are the root cause of the uneven in-plane recovery of VCOM fluctuations caused by Data voltage coupling. This unevenness ultimately manifests as brightness differences between different rows of pixels within the same Sensor block, i.e., Touch Sensor horizontal lines; this problem is particularly pronounced in special scenarios where Data voltage polarity frequently reverses.

[0059] The inventors of this application have discovered through research that the current solution to the problem of horizontal lines on the Touch Sensor is as follows:

[0060] (1) Enable Pattern Detection Function (PDF): This solution relies on the PDF module built into the timing controller (Tcon IC). When the PDF module detects that the display is rendering a pattern, it enables the PDF module to detect the pattern. Figure 1 , Figure 2 When special images that are prone to horizontal stripes (such as Flicker images or Sub-Pixel-OnOff images) are displayed, the polarity arrangement rules of the data voltage will be automatically changed, such as... Figure 10 As shown, the original horizontal inversion (1Dot inversion) polarity arrangement was changed to a more complex inversion method such as "1+2Dot", in an attempt to reduce the visual appearance of horizontal stripes by changing the spatial distribution pattern of coupling.

[0061] However, after enabling the PDF function, the system actively intervened in the screen content, causing the optimal common voltage (Optimal VCOM) debugging process of the display panel to be unable to proceed normally. Engineers had to disable the PDF function in order to accurately debug the optimal VCOM value that matched the panel characteristics, which brought inconvenience and extra steps to production debugging and image quality optimization.

[0062] (2) Add a Touch Sensor shorting transistor array: such as Figure 11 As shown, an additional array of shorting transistors was designed and fabricated in the upper border area of ​​the panel. The sources and drains of these shorting transistors are connected to different Touch Sensor blocks, while their gates are led out from the left and right borders of the panel and connected to a dedicated level conversion module on the printed circuit board (PCB). During display operation, a high-level signal is applied to the gate of the shorting transistors through this module, causing all shorting transistors to conduct simultaneously. This temporarily shorts all the independent Touch Sensor blocks together electrically, connecting them in parallel to a common VCOM bus on the upper border.

[0063] This scheme aims to reduce the overall loop impedance from the VCOM power supply to each sensor block by parallel connection. This not only accelerates the recovery speed of the VCOM voltage after being subjected to coupled interference, but also makes the amplitude of the coupled voltage borne by different sensor blocks more consistent, thereby reducing ripple. However, the inventors of this application have discovered that this scheme still has the following drawbacks:

[0064] ① Uneven improvement effect: Although short-circuited TFTs were added at the edge of the panel, the equivalent impedance of the center area and the edge area of ​​the panel still differs due to the resistance (IR Drop) of the VCOM bus itself. This results in a significantly weaker improvement effect on the horizontal lines in the center area than in the edge area, and poor overall uniformity.

[0065] ② Increased system cost and complexity: For products using Gate COF (Gate COF) chip flip-chip packaging, a dedicated level conversion module is required to control the short-circuited TFT array, which directly increases material costs and circuit board wiring complexity.

[0066] ③ Increased risk of system failure: This solution requires the Tcon IC to output additional control signals to manage the level conversion module, which increases the complexity of system interconnection and control logic, and also increases the potential probability of failure.

[0067] Therefore, in order to improve the accuracy of ripple compensation while avoiding additional hardware costs and reducing system complexity, this application provides a driving circuit 100, specifically including the following embodiments:

[0068] Figure 12 The diagram shows a schematic of a driving circuit 100 provided in an embodiment of this application. The driving circuit 100 in this embodiment is applied to a touch display panel 200, which includes multiple touch sensing blocks, each corresponding to a common electrode. It should be noted that each common electrode serves as a common voltage reference terminal for a group of pixels during display, and simultaneously acts as an independent touch sensing block for detecting touch position during touch operation.

[0069] like Figure 12 As shown, the driving circuit 100 of this embodiment includes a power module 110, which is configured to provide a reference common voltage. Specifically, the power module 110, as a standard voltage source, can be independently set on the main printed circuit board (PCB) of the display device, which facilitates design and debugging and can utilize the existing power management circuit on the board, thus helping to reduce the overall system cost.

[0070] like Figure 12As shown, the driving circuit 100 in this embodiment also includes a control module 120, which is configured to determine the target touch sensing block that needs voltage compensation based on the screen display information, and generate a compensation control signal corresponding to the target touch sensing block.

[0071] It should be noted that the control module 120 in this embodiment is responsible for processing image data streams or frame synchronization signals from the timing controller and other screen display information. Through the built-in pattern detection function, it analyzes each frame of the screen to be displayed to identify whether it contains special patterns that are prone to causing severe VCOM coupling, such as flickering images with the same grayscale across the entire field but polarity reversal between frames, or sub-pixel-on-off images with alternating black and white of adjacent sub-pixels. Once such special images are identified, the control module 120 calculates which blocks' common electrodes will generate uneven voltage fluctuations due to data line coupling, and then marks these blocks as target touch sensing blocks. For each target touch sensing block, the control module 120 generates a corresponding compensation control signal. The compensation control signal at least specifies the start time, end time, compensation voltage, and compensation direction of the compensation action.

[0072] like Figure 12 As shown, the driving circuit 100 in this embodiment also includes at least one compensation module 130, which is connected to the control module 120 and the power supply module 110 and is configured to compensate the reference common voltage according to the compensation control signal to obtain the target common voltage.

[0073] It should be noted that the compensation module 130, acting as a voltage modulator, receives compensation control signals from the control module 120 and a reference common voltage from the power supply module 110 at its input terminals. It then dynamically adjusts the constant reference common voltage in real time according to the instructions in the compensation control signals, thereby generating a target common voltage that meets the requirements. The compensation module 130 offers flexibility in its physical implementation; it can be placed on the system PCB along with the power supply module 110, facilitating circuit debugging and subsequent maintenance. Furthermore, the compensation module 130 can be integrated with the functional circuitry of the touch driver chip (Touch IC), which helps reduce the number of external components and improves system integration and reliability.

[0074] It is worth noting that the compensation module 130 in this embodiment can be implemented in different ways in terms of quantity configuration:

[0075] (1) In one implementation: such as Figure 13 As shown, the compensation module 130 is a shared module that generates the required target common voltage for each target touch sensing block in sequence through time-division multiplexing. This configuration structure is simple, but the compensation speed is limited by serial operation.

[0076] (2) In another embodiment: such as Figure 14 As shown, the touch display panel 200 includes M columns of touch sensing arrays, each column comprising N touch sensing blocks; at least one compensation module 130 includes M compensation modules 130, each corresponding to one column of touch sensing blocks and configured to provide an independent target common voltage for that column. It should be noted that when the touch sensing blocks of the panel are divided into M columns, at least one compensation module 130 can be specifically defined as M independent compensation modules 130, each dedicated to serving one column of sensing blocks. In this way, the compensation voltage generation process for different columns can be performed simultaneously, greatly improving the overall response speed and processing bandwidth of the system, especially suitable for high-resolution or large-size panels.

[0077] like Figure 12 As shown, the driving circuit 100 of this embodiment also includes at least one switching module 140, which is connected to the control module 120, the compensation module 130 and the common electrode, and is configured to apply the target common voltage to the common electrode of the target touch sensing area under the control of the control module 120.

[0078] It should be noted that the switch module 140 is connected between the output of the compensation module 130 and the common electrode of a specific touch-sensing area. Under the control command issued by the control module 120, the corresponding switch module 140 is turned on, thereby applying the target common voltage to the common electrode of the target touch-sensing area. The switch module 140 can also adopt different integration strategies. One approach is to integrate it together with the compensation module 130 inside the touch driver chip to achieve a highly integrated single-chip solution. Another approach is to fabricate it as a separate discrete component or array on the edge of the glass substrate of the display panel (such as the bezel area). This panel-integrated design can further optimize the signal path and reduce parasitic parameters.

[0079] Similar to the compensation module 130, the switch module 140 in this embodiment can also be implemented in different ways in terms of quantity configuration:

[0080] (1) In one implementation: such as Figure 13 As shown, the entire drive circuit 100 only has one switch module 140 (e.g., Figure 13 S1 in the text is in an off state during the touch phase and in a closed state during the display phase.

[0081] (2) In another implementation: such as Figure 14As shown, at least one switch module 140 includes M×N switch modules 140, each switch module 140 being connected between a touch-sensing block and a compensation module 130 corresponding to its column. The control module 120 is further configured to group the compensation control signals by column and, through time-division control of the conduction state of the N switch modules 140 in the m-th column, apply the target common voltage output by the m-th compensation module 130 to the selected target touch-sensing block in the m-th column. Specifically, when the touch display panel 200 contains M columns and N rows of touch-sensing blocks, at least one switch module 140 is implemented as a matrix composed of M×N independent switch modules 140. Each switch module 140 uniquely corresponds to a specific block (e.g., the m-th column and n-th row). This arrangement, combined with the aforementioned M independent compensation modules 130, enables the control module 120 to perform coordinated control on a column-by-column basis: for the m-th column, its dedicated compensation module 130 prepares the target common voltage required for that column; simultaneously, the control module 120 controls one or more of the N switching modules 140 in that column to conduct within a specific time window through time-division scanning, thereby delivering voltage to the selected target touch sensing area in that column; therefore, this process between different columns can be performed completely synchronously, achieving parallelized fine compensation.

[0082] Therefore, the working principle of the driving circuit 100 in this embodiment is as follows:

[0083] (1) When the display data of each frame begins to be processed, the control module 120 analyzes the input screen display information in real time and determines whether the current frame belongs to a special screen type that is prone to horizontal lines. If the determination is no, no compensation is performed and the next frame to be displayed is detected. If the determination is yes, the control module 120 calculates which blocks' common electrodes will generate beyond the acceptable range due to data voltage coupling and identifies these blocks as target touch sensing blocks.

[0084] (2) For each target touch sensing block, the control module 120 generates a corresponding compensation control signal according to the gate scan timing of the target touch sensing block; wherein, the compensation control signal includes the amplitude of the compensation voltage, the compensation direction, and the compensation timing.

[0085] (3) For the drive circuit 100 using a single shared compensation module 130, it will generate the corresponding target common voltage for each target block in the order scheduled by the control module 120. For the parallel system using M independent compensation modules 130, the compensation modules 130 in each column will simultaneously receive the compensation instructions of the target blocks in their respective columns and generate the target common voltage required by their respective columns in parallel.

[0086] (4) In the shared module system, a gating network routes the target common voltage generated at the current moment to the corresponding target common electrode. In the M×N switch matrix system, the control module 120 issues an instruction to turn on the specific switch module 140 (located in the m-th column and n-th row) connected to the current target touch sensing block. The voltage output by the dedicated compensation module 130 of that column is then applied to the common electrode of the target touch sensing block through this turned-on switch. This actively applied voltage corrects the undesirable fluctuations on the electrode caused by data coupling, thereby making the effective common voltage felt by all pixel rows within the block more consistent. When the scanning and compensation period of the block ends, its corresponding switch module 140 is turned off, and the system prepares to repeat the above process for the next target block (or, in a parallel system, other column target blocks processed synchronously). Through this process, the drive circuit 100 achieves targeted suppression of horizontal lines in touch sensing blocks at specific locations under specific screen conditions, improving display uniformity.

[0087] In summary, this application achieves intelligent triggering and precise positioning of compensation by having the control module 120 determine the target touch-sensing block based on the information displayed on the screen and generate a compensation control signal. Then, the compensation module 130 compensates the reference common voltage output by the power module 110 according to the compensation control signal, generating a target common voltage that matches the coupling characteristics of the specific block, thus achieving precise adjustment of the compensation amount. Finally, under the control of the control module 120, the switch module 140 selectively applies the target common voltage to the target common electrode, solving the problem of uneven in-plane compensation caused by the segmentation of the common electrode. Therefore, this application achieves high-precision, adaptive compensation for horizontal lines of the touch-sensing block through the collaborative work of the control module 120, the compensation module 130, and the switch module 140. Furthermore, the control module 120, the compensation module 130, and the switch module 140 in this application can be flexibly integrated into the system PCB or existing driver chip without the need for additional short-circuit transistor arrays and independent level conversion modules, thereby significantly improving the accuracy of horizontal line compensation while effectively avoiding increased hardware costs and system complexity.

[0088] In one embodiment, such as Figure 14 As shown, the driving circuit 100 also includes: M power amplifiers U1, the input terminal of each power amplifier U1 is connected to the output terminal of the power module 110, and the output terminal of each power amplifier U1 is connected to the output terminal of a compensation module 130.

[0089] It should be noted that in the architecture containing M independent compensation modules 130, each compensation module 130 requires a stable and sufficiently powerful voltage source to generate and output the target common voltage required by the column it is responsible for. To this end, this embodiment adds M power amplifiers U1 to the drive circuit 100. The main purpose is to improve the driving capability and stability of the voltage source, and ensure that the voltage supplied to the compensation module 130 can remain highly stable even under dynamic load changes, so as to provide a reliable voltage basis for subsequent compensation.

[0090] like Figure 13 and Figure 14 As shown, the switch module 140 includes: a switch transistor, the control terminal of the switch transistor is connected to the control module 120, the first terminal of the switch transistor is connected to the output terminal of the compensation module 130, and the second terminal of the switch transistor is connected to the common electrode corresponding to the touch sensing area.

[0091] It should be noted that the switch module 140 in this embodiment is specifically implemented using a switching transistor, typically a thin-film transistor (TFT). As a voltage-controlled electronic switch, it responds to timing commands issued by the control module 120 to establish or disconnect a conductive path between the first and second terminals. Specifically, by controlling the conduction of the switching transistor, the target common voltage generated by the compensation module 130 can be accurately transmitted to the designated touch-sensing area. By controlling the turn-off of the switching transistor, electrical isolation between the blocks can be ensured, avoiding signal crosstalk.

[0092] Figure 15 The diagram shown is a circuit diagram of a compensation module 130 provided in an embodiment of this application; as follows: Figure 15 As shown, the compensation module 130 in this embodiment includes at least a power amplifier U2 and a compensation capacitor C1. Specifically, the input terminal of the power amplifier U2 in this embodiment is connected to the compensation signal output terminal of the control module 120. It receives a compensation control signal, which is usually a small current, from the control module 120 and amplifies the signal to convert it into a strong signal with sufficient driving capability that can be directly used to modulate the common electrode voltage. This ensures the effective execution of the compensation command and avoids slow or distorted compensation response due to insufficient signal driving capability.

[0093] In this embodiment, the first end of the compensation capacitor C1 is connected to the output end of the power amplifier U2, and the second end of the compensation capacitor C1 serves as the output end of the compensation module 130. Specifically, the compensation capacitor C1 acts as a charge storage element, and the voltage across its terminals changes rapidly in response to the changes in the output signal of the power amplifier U2, thereby converting the amplified control signal into a compensation voltage that can be directly output.

[0094] Therefore, the working principle of the compensation module 130 in this embodiment is as follows: the compensation control signal output by the control module 120 is amplified by the power amplifier U2 and then charges or discharges the compensation capacitor C1, thereby establishing and maintaining a target compensation voltage proportional to the compensation control signal at the second end of the compensation capacitor C1 (i.e. the output end of the compensation module 130), thereby realizing efficient and fast conversion from low power control signal to high drive capability compensation voltage.

[0095] In another embodiment, the compensation module 130 further includes a first resistor R1, a second resistor R2, and a third resistor R3; wherein, the first end of the first resistor R1 is connected to the output terminal of the power amplifier U2, and the second end of the first resistor R1 is connected to the first end of the compensation capacitor C1; the first end of the second resistor R2 is connected to the inverting input terminal of the power amplifier U2, and the second end of the second resistor R2 is connected to the second end of the compensation capacitor C1; wherein, the non-inverting input terminal of the power amplifier U2 is connected to the compensation signal output terminal of the control module 120; the first end of the third resistor R3 is connected to the first end of the second resistor R2, and the second end of the third resistor R3 is grounded.

[0096] It should be noted that in this embodiment, the first resistor R1 is connected in series between the output terminal of the power amplifier U2 and the first terminal of the compensation capacitor C1. Its main function is to limit current and isolate, which can suppress possible transient large currents and reduce the risk of oscillation that may be caused by direct coupling between the amplifier output stage and the capacitive load.

[0097] In this embodiment, the second resistor R2 and the third resistor R3 together form a feedback voltage divider network, which can feed back a portion of the final output voltage of the compensation module 130 to the inverting input terminal of the power amplifier U2. This is compared with the compensation control signal at the non-inverting input terminal, forming a closed-loop negative feedback system. The established input-output relationship is: Vout = Vin × (1 + R2 / R3); where Vout represents the output voltage of the compensation module 130, and Vin represents the input voltage of the compensation module 130. Therefore, the negative feedback structure of this embodiment makes the output voltage of the compensation module 130 exhibit a linear proportional relationship with the control signal. The proportionality coefficient is determined by the resistance values ​​of the second resistor R2 and the third resistor R3, and is not affected by the drift of the amplifier's own parameters, thereby improving the generation accuracy, temperature stability, and anti-interference capability of the compensation voltage.

[0098] Figure 16 The diagram shown is a flowchart of a driving method provided in an embodiment of this application; as follows: Figure 16 The driving method of this embodiment is applied to the driving circuit 100 of the above embodiment, and is mainly executed by the control module 120 of the driving circuit 100. Specifically, it includes the following steps:

[0099] Step S100: Based on the screen information of the currently displayed screen, determine at least one target touch sensing block that requires voltage compensation.

[0100] Specifically, this step analyzes and judges the currently displayed image content to identify scenarios that may cause uneven coupling of the common electrode voltage of the touch sensing area, and locates one or more specific areas that have a significant impact, which are then designated as target touch sensing areas.

[0101] Step S200: Determine the compensation timing corresponding to the target touch sensing area based on the count of the clock control signal.

[0102] Specifically, this step quantifies abstract time points into specific count values ​​by counting the pulses of the clock control signal, thereby obtaining the compensation timing corresponding to each target touch sensing block in the display scanning cycle.

[0103] Step S300: In response to the compensation timing, selectively compensate the common electrode voltage of the target touch sensing area.

[0104] It should be noted that the compensation timing in this embodiment includes a start compensation time and an end compensation time. That is, between the start compensation time and the end compensation time, the control module 120 outputs a compensation control signal to the compensation module 130 and simultaneously controls the switch module 140 to close. This allows the compensation module 130 to compensate the reference common voltage output by the power module 110, and then transmits it to the corresponding common electrode through the closed switch module 140, thereby achieving selective compensation of the common electrode voltage of the target touch sensing area.

[0105] In one embodiment, determining at least one target touch sensing block requiring voltage compensation based on the screen information of the currently displayed screen specifically includes the following steps:

[0106] Step S110: Detect the currently displayed screen and obtain the current screen type.

[0107] Step S120: If the current screen type is a preset screen type, obtain the screen information of the currently displayed screen.

[0108] Step S130: Based on the screen information and the positional relationship of multiple touch sensing blocks in the touch display panel 200, determine at least one target touch sensing block whose coupling voltage difference exceeds a preset threshold.

[0109] This combination Figure 17 The working principle of this embodiment is explained as follows:

[0110] (1) First, the control module 120 performs feature analysis on the display data stream of the current frame by calling or starting the built-in pattern detection function, calculates and judges the global pixel polarity arrangement and grayscale distribution mode of the screen in real time, and compares it with the pre-stored feature library, thereby classifying the current screen type into ordinary screen type or preset screen type (i.e. special screen); among them, the preset screen type includes flicker detection screen type and sub-pixel switch screen type, precisely because the data voltage change mode of these two types of screens has been theoretically analyzed and experimentally verified to be the most likely to cause significant VCOM coupling differences.

[0111] (2) Then, the compensation process is initiated only when the current screen is detected to belong to the preset screen type. Specifically, the coupling voltage is simulated and calculated by combining the acquired detailed screen information with the pre-stored panel physical design data (i.e., the positional relationship of each touch sensing block, its corresponding gate line range, and the impedance model of the Tx trace). The voltage fluctuation amplitude caused by data voltage coupling on the common electrode of each touch sensing block under the current specific screen data is evaluated, and the voltage difference that may occur within the same block (such as between the first and last rows) is calculated. By comparing the calculated difference value with the preset threshold, blocks whose internal voltage non-uniformity exceeds the acceptable range and may visually show horizontal lines are screened out, and these blocks are finally determined as the target touch sensing blocks that need to be compensated.

[0112] In one embodiment, the compensation timing corresponding to the target touch sensing area is determined based on the counting of the clock control signal, specifically including the following steps:

[0113] Step S210: Based on the synchronization relationship between the clock control signal and the gate scan signal of the touch display panel 200, and the row position mapping relationship of the target touch sensing block on the panel, obtain the compensation start count value and compensation end count value corresponding to the target touch sensing block.

[0114] Step S220: During the display period, count the pulse edges of the clock control signal to obtain the real-time count value;

[0115] Step S230: When the real-time count value reaches the compensation start count value corresponding to the target touch sensing area, a timing trigger signal for starting compensation is generated;

[0116] Step S240: When the real-time count value reaches the compensation end count value corresponding to the target touch sensing area, a timing shutdown signal for ending compensation is generated.

[0117] This combination Figure 18 , Figure 19 and Figure 20 The working principle of this embodiment is explained as follows:

[0118] (1) Establishing a time base and mapping relationship: In this embodiment, the clock control signal can be the core control clock of the 200GOA (gate driver integrated) touch display panel system, such as Figure 18 The CPV1 and CPV2 outputs from the control module 120 shown are clock control signals that, after passing through a level conversion module, generate the CK (gate clock) signal to drive the GOA unit for line-by-line scanning; as shown... Figure 19 As shown, the rising edge of the CPV1 signal is synchronized with the rising edge of each group of gate drive signals, and the rising edge of the CPV2 signal is synchronized with the falling edge of each group of gate drive signals.

[0119] Therefore, during the design and debugging phase, a mapping table is pre-established and stored based on the physical design parameters of the panel (GOA unit cascading order, scan time corresponding to each row of pixels, and the specific row range covered by each touch-sensing block), as shown in Table 1:

[0120] Table 1. Correspondence between Compensation Start and End Positions

[0121]

[0122] In Table 1, the identifier of each touch sensing block (such as T(k)) is matched with the time point required for its compensation operation. The time point is represented by the rising edge number of the CPV1 signal, namely the compensation start count value CS(k) and the compensation end count value CE(k), thus completing the mapping from spatial location (block) to time coordinate (count number).

[0123] (2) Real-time counting and window matching: During display operation, the control module 120 continuously counts the rising edge of the CPV1 signal pulse in real time, and this count value is the real-time count value; when it is necessary to compensate for a specific target touch sensing block, the control module 120 will query the above mapping table to obtain the CS(k) and CE(k) values ​​corresponding to the block; wherein, the target touch sensing block can be Figure 20 The T(k) block shown exhibits horizontal stripes due to uneven coupling.

[0124] Combination such as Figure 17 Work process and Figure 20 As shown in the timing diagram, the control module 120 continuously compares the real-time count value with the preset CS(k) and CE(k). When the real-time count value reaches the compensation start count value CS(k), it indicates that the system timeline has progressed to a specific moment during the scanning of the target block (e.g., the moment when the last row pixel of the block begins charging). At this time, a timing trigger signal is immediately generated to indicate that the compensation for the block has officially started. When the real-time count value reaches the compensation end count value, it indicates that the compensation for the block has ended, and a timing turn-off signal is immediately generated.

[0125] It should be noted that the timing trigger signal and the timing turn-off signal together constitute the compensation timing for the target touch sensing area, which is used to drive the subsequent generation and application of compensation voltage. This ensures that the compensation behavior and the coupling voltage fluctuation that causes the horizontal lines are precisely aligned at the moment of occurrence, so as to most effectively cancel or correct them.

[0126] In one embodiment, in response to the compensation timing, selective compensation is performed on the common electrode voltage of the target touch sensing area, specifically including the following steps:

[0127] Step S310: During the effective period of the compensation timing, generate a compensation control signal corresponding to the target touch sensing area.

[0128] Step S320: Compensate the reference common voltage according to the compensation control signal to obtain the target common voltage.

[0129] Step S330: Apply a target common voltage to the target touch sensing area so that the common voltage between different pixel rows within the target touch sensing area is within a preset range.

[0130] This combination Figure 21 and Figure 22 The working principle of this embodiment is explained as follows:

[0131] (1) Generating a compensation control signal: In the above embodiment, the compensation start count value CS(k) and compensation end count value CE(k) for the target touch sensing area are determined by counting the clock control signal (such as CPV1). Within this time window, the control module 120 generates a compensation control signal corresponding to the target touch sensing area; the compensation control signal includes the compensation direction and the compensation amplitude, wherein the compensation direction determines whether the compensation operation is to increase or decrease the voltage level of the common electrode, corresponding to Figure 21 The reduction in coupling amplitude shown Figure 22 The diagram illustrates two different compensation strategies for increasing the coupling amplitude; the compensation amplitude quantifies the amount of voltage change that needs to be adjusted.

[0132] (2) Convert the compensation control signal into the actual compensation voltage: The compensation module 130 actively modulates the reference common voltage provided by the power supply module 110 according to the compensation control signal output by the control module 120, and finally outputs a compensated target common voltage.

[0133] When adopting such Figure 21When implementing the strategy to reduce coupling amplitude, during the period when the common voltage of the target touch sensing block, such as T(k), should experience large positive fluctuations due to data coupling (e.g., during the scanning period from G(n) to G(n+3), an inverse voltage adjustment is actively injected into the output of the power module 110 to lower its fluctuation peak and make it consistent with the VCOM fluctuation amplitude of other locations in the block (e.g., earlier scan lines).

[0134] When adopting such Figure 22 When the increased coupling amplitude strategy is shown: during the period when the VCOM coupling amplitude of the T(k) block is small, a voltage boost in the same direction is actively injected into the output of the power module 110 to raise its voltage to match the higher fluctuation level at other locations in the block.

[0135] (3) Fixed-point application of the compensated common voltage: By controlling the switch module 140 connected to the target touch sensing block to be turned on within the compensation window, the generated target common voltage is applied to the common electrode of the target touch sensing block, thereby achieving selective compensation.

[0136] In summary, this embodiment achieves uniformity of the effective common voltage within the block by actively compensating for reducing or increasing the coupling amplitude, thereby suppressing the generation of horizontal stripes.

[0137] In one embodiment, this application provides a touch display device, which includes a touch display panel 200 and a driving circuit 100 as shown in the above embodiment; wherein, the touch display panel 200 includes a plurality of touch sensing blocks, each touch sensing block corresponding to a common electrode; the driving circuit 100 is electrically connected to each common electrode and is configured to: during the display phase, compensate the common voltage corresponding to the touch sensing blocks that require voltage compensation according to the screen display information on the touch display panel 200.

[0138] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0139] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0140] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A driving circuit, characterized in that, Applied to a touch display panel, the touch display panel includes multiple touch sensing blocks, each touch sensing block corresponding to a common electrode, and the driving circuit includes: The power module is configured to provide a reference common voltage; The control module is configured to determine the target touch sensing block requiring voltage compensation based on the screen display information, and generate a compensation control signal corresponding to the target touch sensing block; specifically, it includes: detecting the current display screen and obtaining the current screen type; if the current screen type is a preset screen type, obtaining the screen information of the current display screen; wherein, the preset screen type includes a flicker detection screen type and a sub-pixel switch screen type; the screen information includes the polarity arrangement and grayscale distribution of pixels; based on the screen information and the positional relationship of the multiple touch sensing blocks in the touch display panel, determining at least one target touch sensing block whose coupling voltage difference exceeds a preset threshold; based on the synchronization relationship between the clock control signal and the gate scan signal of the touch display panel, and the... The system describes the row position mapping relationship of the target touch-sensing area on the panel, and obtains the compensation start count value and compensation end count value corresponding to the target touch-sensing area. During the display period, the pulse edges of the clock control signal are counted to obtain a real-time count value. When the real-time count value reaches the compensation start count value corresponding to the target touch-sensing area, a timing trigger signal for starting compensation is generated. When the real-time count value reaches the compensation end count value corresponding to the target touch-sensing area, a timing shutdown signal for ending compensation is generated. The timing trigger signal and the timing shutdown signal constitute the compensation timing sequence. During the effective period of the compensation timing sequence, a compensation control signal corresponding to the target touch-sensing area is generated. The compensation control signal includes a compensation direction and a compensation amplitude. At least one compensation module, connected to the control module and the power module, is configured to compensate the reference common voltage according to the compensation control signal to obtain a target common voltage; At least one switching module, connected to the control module, the compensation module and the common electrode, is configured to: apply the target common voltage to the common electrode of the target touch sensing block under the control of the control module.

2. The driving circuit according to claim 1, characterized in that, The touch display panel includes M columns of touch sensing columns arranged in an array, and each column of touch sensing columns includes N touch sensing blocks; The at least one compensation module includes M compensation modules, each compensation module corresponding to a column of touch sensing, and is configured to provide an independent target common voltage for the corresponding column of touch sensing; The at least one switch module includes M×N switch modules, and each switch module is connected between a touch sensing block and the compensation module corresponding to its column; The control module is further configured to: group the compensation control signals by column, and apply the target common voltage output by the m-th compensation module to the selected target touch sensing block in the m-th column by time-division control of the conduction state of N switch modules in the m-th column.

3. The driving circuit according to claim 2, characterized in that, The driving circuit further includes: M power amplifiers, the input terminal of each power amplifier is connected to the output terminal of the power module, and the output terminal of each power amplifier is connected to the output terminal of a compensation module. Or / and, the switching module includes: a switching transistor, the control terminal of the switching transistor being connected to the control module, the first terminal of the switching transistor being connected to the output terminal of the compensation module, and the second terminal of the switching transistor being connected to the common electrode corresponding to the touch sensing area.

4. The driving circuit according to any one of claims 1-3, characterized in that, The compensation module includes: A power amplifier, the input terminal of which is connected to the compensation signal output terminal of the control module; A compensation capacitor is provided, with its first end connected to the output terminal of the power amplifier and its second end serving as the output terminal of the compensation module.

5. The driving circuit according to claim 4, characterized in that, The compensation module also includes: A first resistor, the first end of which is connected to the output terminal of the power amplifier, and the second end of which is connected to the first end of the compensation capacitor; The second resistor has its first end connected to the inverting input terminal of the power amplifier and its second end connected to the second end of the compensation capacitor; wherein the non-inverting input terminal of the power amplifier is connected to the compensation signal output terminal of the control module. The third resistor has its first end connected to the first end of the second resistor, and its second end grounded.

6. A driving method based on the driving circuit of claim 1, characterized in that, Applied to a touch display panel, the touch display panel includes multiple touch sensing blocks, each touch sensing block corresponding to a common electrode, the driving method includes: Based on the screen information currently displayed, identify at least one target touch sensing block that requires voltage compensation; Based on the counting of the clock control signal, the compensation timing corresponding to the target touch sensing block is determined; In response to the compensation timing, the common electrode voltage of the target touch sensing area is selectively compensated.

7. The driving method according to claim 6, characterized in that, In response to the compensation timing, selective compensation is performed on the common electrode voltage of the target touch sensing area, including: During the effective period of the compensation timing, a compensation control signal corresponding to the target touch sensing area is generated; wherein, the compensation control signal includes a compensation direction and a compensation amplitude; The reference common voltage is compensated according to the compensation control signal to obtain the target common voltage; The target common voltage is applied to the target touch sensing block so that the common voltage between different pixel rows within the target touch sensing block is within a preset range.

8. A touch display device, characterized in that, The touch display device includes: The touch display panel includes multiple touch-sensing blocks, each corresponding to a common electrode; The driving circuit according to any one of claims 1-5, electrically connected to each common electrode, is configured to: during the display phase, compensate the common voltage corresponding to the touch sensing block requiring voltage compensation based on the screen display information on the touch display panel.

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