CN110531896B - Touch driving method, touch driving device and touch panel - Google Patents

Abstract

This application provides a touch driving method, a touch driving device and a touch panel. The method includes: the driving controller calculates the reference signal parameters of the touch electrode on the transmitting electrode line based on the reference voltage and the transmitting electrode line; The demand signal parameters and reference signal parameters are calculated to obtain the compensation signal parameters, and the ladder compensation input voltage is generated according to the compensation signal parameters of each touch electrode; the reference signal parameters and the ladder compensation input voltage are processed by the voltage amplifier to obtain the amplified driving signal; when When the amplified driving signal reaches or exceeds the preset output signal parameter threshold, discharge is performed according to the preset discharge strategy to obtain the emission driving signal, and the emission driving signal is output to the emission electrode line. The invention overcomes the problem of driving signal attenuation in the touch screen.

Description

Touch driving method, touch driving device and touch panel

Technical field

The present application relates to the technical field of touch, and in particular, to a touch driving method, a touch driving device and a touch panel.

Background technique

Capacitive touch screen technology uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are each coated with a layer of indium tin oxide transparent conductive material (ITO). The outermost layer is A thin layer of silica glass protective layer, interlayer ITO coating as the working surface, four electrodes drawn from the four corners, and the inner ITO layer as a shielding layer to ensure a good working environment.

When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitance is formed between the user and the touch screen surface. For high-frequency current, the capacitance is a direct conductor, so the finger draws a very small current from the contact point. This current It flows out from the electrodes on the four corners of the touch screen respectively, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents.

As touch screens are used more and more widely in products such as computers and mobile phones, the requirements for touch screen performance are also constantly increasing, especially in the applications of ultra-narrow bezel mobile phones and large-screen touch screens. Touch screens used in computers and mobile phones often use ITO as capacitive sensor electrodes, but the sheet resistance of the ITO conductive material is relatively large. The commonly used resistance is 30-400R (sheet resistance). When the ITO electrode lead length is long or the trace width is relatively small, the resistance at both ends of the lead is It is very large and can reach several KΩ to hundreds of KΩ. The edge area of ultra-narrow bezel mobile phone touch screens is very narrow, the electrode trace width is also very narrow, and the resistance at both ends of the line is very large, resulting in serious attenuation of the drive signal. The large size of the touch screen of a large-screen computer has a long lead length, resulting in a large resistance at both ends of the lead, which will also cause severe attenuation of the drive signal.

Therefore, how to provide a solution that can ensure that the driving signal in the capacitive touch screen is stable and does not attenuate is a technical problem that needs to be solved urgently in this field.

Contents of the invention

The purpose of this application is to provide a touch driving method, a touch driving device and a touch panel to solve the technical problem in the prior art that the resistance at both ends of the capacitive touch screen circuit causes serious attenuation of the driving signal.

In order to achieve the above purpose, this application provides 1. A touch driving method, which is characterized by including:

The drive controller calculates the reference signal parameters of the touch electrode on the emission electrode line according to the reference voltage and the emission electrode line;

Compensation signal parameters are calculated according to the demand signal parameters of the touch electrodes and the reference signal parameters, and the step compensation input voltage is controlled to be generated according to the compensation signal parameters of each of the touch electrodes;

The reference signal parameters and the ladder compensation input voltage are processed by a voltage amplifier to obtain an amplified driving signal;

When the amplified drive signal reaches or exceeds a preset output signal parameter threshold, discharge is performed according to a preset discharge strategy to obtain a launch drive signal, and the launch drive signal is output to the launch electrode line.

Optionally, the compensation signal parameters are calculated according to the demand signal parameters of the touch electrodes and the reference signal parameters, and the step compensation input voltage is controlled to be generated according to the compensation signal parameters of each of the touch electrodes, as:

Compensation signal parameters are calculated according to the demand signal parameters of the touch electrode and the reference signal parameters;

According to the compensation signal parameters of each of the touch electrodes, combined with the parallel and/or series voltage given branch distribution parameters, the variable voltage given branch combination of the compensation signal is calculated;

The compensation drive voltage is combined through the voltage transformer given branch to generate a step compensation input voltage; wherein the voltage transformer given branch includes: a transformer resistor and a transformer drive switch.

Optionally, when the amplified drive signal reaches or exceeds the preset output signal parameter threshold, discharge is performed according to the preset discharge strategy and the emission drive signal is obtained, which is:

When the amplified driving signal reaches or exceeds a preset output signal parameter threshold, a discharge signal parameter is obtained according to the emission driving signal parameter, the output signal parameter threshold and a preset discharge strategy;

Calculate the transformer discharge branch combination of the discharge signal based on the discharge signal parameters combined with the parallel and/or series transformer discharge branch distribution parameters;

The amplified drive signal is combined through the transformer discharge branch circuit and discharged to obtain a transmit drive signal; wherein the transformer discharge branch circuit includes: a discharge resistor and a discharge drive switch.

Optionally, the method also includes:

According to the amplified drive signal and reference signal parameters, the discharge pulse time and discharge period are obtained in comparison with the discharge input parameters and adjustment parameters in the discharge strategy;

Discharging is performed according to the discharge pulse time and the discharge cycle.

Optionally, the method further includes: when detecting a change in the touch electrode on the emission electrode line, detecting a change in the reference signal parameter of the increasing/decreasing touch electrode;

The updated reference signal parameters are calculated based on the changed reference signal parameters and the pre-changed reference signal parameters, and the updated reference signal parameters are replaced with the reference signal parameters.

On the other hand, the present invention also provides a touch control driving device, comprising: a reference voltage input terminal, a driving controller, a voltage amplifier, a driving signal compensation processor, a driving signal discharge processor and a driver signal output terminal; wherein,

The reference voltage input terminal is connected to the drive signal compensation processor and the drive signal discharge processor, and inputs the reference voltage to the drive signal discharge processor;

The drive controller is connected to the drive signal compensation processor, the drive signal discharge processor, the reference voltage input terminal and the emitter electrode line, and calculates the value of the touch electrode on the emitter electrode line according to the reference voltage and the emitter electrode line. Reference signal parameters;

Compensation signal parameters are calculated according to the demand signal parameters of the touch electrodes and the reference signal parameters, and the step compensation input voltage is controlled to be generated according to the compensation signal parameters of each of the touch electrodes;

When the amplified driving signal reaches or exceeds the preset output signal parameter threshold, the preset discharge strategy is called;

The drive signal compensation processor is connected to the reference voltage input terminal, voltage amplifier and drive controller, receives and processes the ladder compensation input voltage and then transmits it to the voltage amplifier;

The voltage amplifier is connected to the reference voltage input terminal, the drive signal compensation processor, the drive signal discharge processor and the driver signal output terminal, and processes the reference signal parameters and the ladder compensation input voltage to obtain an amplified drive. Signal;

The drive signal discharge processor is connected to the voltage amplifier, drive controller and driver signal output terminal, performs discharge according to the discharge strategy, and transmits the amplified drive signal after discharge processing to the driver signal output terminal;

The driver signal output terminal is connected to the voltage amplifier, the drive signal discharge processor and the transmitter electrode line, receives the amplified drive signal after discharge processing to obtain the transmit drive signal, and outputs the transmit drive signal to the transmitter electrode wire.

Optionally, the drive signal compensation processor includes more than or equal to two transformer given branches, and the transformer given branch includes: a transformer resistor and a transformer drive switch; wherein,

The variable voltage resistor is connected to the reference voltage input terminal, the voltage amplifier and the signal control switch; the variable voltage drive switch is connected to the variable voltage resistor and the drive controller;

The driving controller calculates compensation signal parameters according to the required signal parameters of the touch electrode and the reference signal parameters;

According to the compensation signal parameters of each of the touch electrodes, combined with the parallel and/or series voltage given branch distribution parameters, a variable voltage given branch combination of the compensation signal is calculated; according to the voltage given branch The combination controls the opening/closing of the corresponding drive switch;

The voltage transformer gives a branch combination and processes the passed compensation driving voltage to generate a ladder compensation input voltage.

Optionally, the drive signal discharge processor comprises: greater than or equal to two voltage-changing discharge branches, the voltage-changing discharge branches comprising: a discharge resistor and a discharge drive switch; wherein the discharge resistor is connected to the voltage amplifier, the driver signal output terminal and the discharge drive switch; the discharge drive switch is connected to the discharge resistor and the drive controller;

The drive controller detects that when the amplified drive signal reaches or exceeds a preset output signal parameter threshold, a discharge signal parameter is obtained according to the emission drive signal parameter, the output signal parameter threshold and a preset discharge strategy;

The transformer discharge branch combination of the discharge signal is calculated according to the parameters of the discharge signal combined with the distribution parameters of the parallel and/or series transformer discharge branches; the corresponding discharge drive switch is controlled according to the transformer discharge branch combination. Open close;

The transformer discharge branch combination performs discharge processing on the passed amplified drive signal to obtain a transmit drive signal, and transmits the transmit drive signal to the driver signal output end.

Optionally, the drive controller includes: a compensation voltage drive controller, a discharge drive controller and a discharge pulse parameter controller;

The compensation voltage drive controller is connected to the drive signal compensation processor; the discharge drive controller is connected to the drive signal discharge processor;

The discharge pulse parameter controller is connected to the drive signal discharge processor, and obtains the discharge pulse time and discharge according to the amplified drive signal and reference signal parameters, and the comparison relationship between the discharge input parameters and the adjustment parameters in the discharge strategy. Period; according to the discharge pulse time and discharge period, the corresponding discharge drive switch is controlled to open or close to perform discharge.

The present invention also provides a touch panel, including the above-mentioned touch driving device.

The touch driving method, touch driving device and touch panel of the present application achieve at least the following beneficial effects:

(1) The touch driving method, touch driving device and touch panel of the present application control voltage input and output through a driving controller, and combine with a voltage amplifier to generate a step voltage input or discharge, so that the driver signal output end outputs a pulse voltage that meets the requirements of the touch screen circuit, compensating for the resistance difference of the ITO lead from the near end to the far end of the transmission channel in the touch screen, thereby overcoming the problem of drive signal attenuation in the touch screen.

(2) The touch driving method, touch driving device and touch panel of the present application control voltage input and output control through a driving controller, combined with a voltage amplifier, to control and compensate for the attenuation of the driving signal in the touch screen. It can also be used according to different methods. The resistive ITO electrodes are also set to control different driving voltages and discharge constants to meet different specific touch drive control needs.

(3) The touch driving method, touch driving device and touch panel of this application control voltage input and output control through a drive controller, combined with a voltage amplifier, to control and compensate for the attenuation of the drive signal in the touch screen. According to different touch screens The size and shape can be controlled and adjusted by driving voltage and discharge constant. There is no need to design a corresponding drive control for each touch screen, and it can be applied to touch screen drive control of various specifications.

Description of drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments recorded in this application. For those skilled in the art, other drawings can also be obtained based on these drawings.

FIG1 is a schematic diagram of the structure of a touch screen and a display according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a touch screen in an embodiment of the present invention;

FIG3 is an equivalent schematic diagram of a transmitting electrode that has not been processed by the touch control driving device in an embodiment of the present invention;

FIG4 is a schematic diagram of a flow chart of a first touch control driving method according to an embodiment of the present invention;

Figure 5 is a schematic flowchart of the second touch driving method in an embodiment of the present invention;

Figure 6 is a schematic flowchart of the third touch driving method in an embodiment of the present invention;

Figure 7 is a schematic flowchart of the fourth touch driving method in an embodiment of the present invention;

Figure 8 is a schematic flowchart of the fifth touch driving method in an embodiment of the present invention;

Figure 9 is a schematic structural diagram of the first touch driving device in an embodiment of the present invention;

Figure 10 is a schematic structural diagram of the second touch driving device in an embodiment of the present invention;

Figure 11 is a schematic structural diagram of a third touch driving device in an embodiment of the present invention;

Figure 12 is a schematic structural diagram of a fourth touch driving device in an embodiment of the present invention;

FIG. 13 is a schematic diagram of an emitter electrode driving circuit in a touch driving device according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of this application.

Example

As shown in Figures 1 to 3, Figure 1 is a schematic diagram of the structure of the touch screen and the display in this embodiment; Figure 2 is a schematic diagram of the structure of the touch screen in this embodiment. A touch screen, also known as a "touch screen" or "touch panel", is an inductive liquid crystal display device that can receive input signals such as contacts. In a touch display screen, the display screen 102 is located on a conductive bottom plate 103, and the touch screen 101 is located on the display screen 102.

The structure of the capacitive touch screen (touch screen) is shown in Figure 2. The horizontal direction is the transmitting electrode line 201, and the vertical direction is the receiving electrode line 202 which is insulated from the horizontal direction. The receiving electrode line 202 is connected to the receiving circuit 203. The transmitting electrode line 201 is connected to the emission driving circuit 204 through leads. The horizontal and vertical electrodes are made of ITO transparent conductive material, which is a conductor and does not affect the display content under the touch screen. Because the width of the electrode part is many times larger than the width of the lead, it is basically not affected by the ITO square resistance. The voltage on the entire electrode is basically uniform. There will be a relatively large induction capacitance at the intersection of each horizontal channel and vertical channel. When the emitter electrode is One channel applies an electrical pulse of a certain amplitude (other channels are left floating or grounded). All receive channels receive this signal through the crosspoint sensing capacitor. The signal at the intersection point is only related to the position of the transmitting channel. If all the transmitting channels are scanned according to the above method and the reception information of each intersection point is recorded, when the intersection point shown in Figure 2 is approached with a conductor or finger of a certain area (or Touch), part of the cross-induced voltage is discharged to the ground, and the equivalent induction capacitance is reduced. By comparing the information before touching, the touch state of the intersection can be detected, and calculating the coordinates of the intersection can determine which one or more intersections were touched. This is the principle of capacitive touch screen.

FIG3 is an equivalent schematic diagram of a certain transmitting electrode that has not been processed by the touch driving device in this embodiment. It can be seen from the figure that the driver outputs to the transmitting electrode, and the transmitting electrode is a conductor with an open circuit in space, and the DC resistance is infinite. The AC impedance is composed of the ITO line resistance and the distributed capacitance of the display bottom plate. The driver output is a pulse signal, and the circuit design should be considered according to the AC impedance.

Due to the existence of ITO lead resistance and distributed capacitance, when the driver output signal reaches the emitter electrode, the voltage is severely attenuated and the rising and falling edges of the pulse become worse. The receiving circuit has certain requirements for the strength of the electrode induction signal. If the attenuation of the transmitting signal cannot meet the requirements of the receiving circuit, the transmitting voltage must be increased. The 3.3V-5V voltage commonly used in weak current circuits is far from meeting the above requirements. Waveform distortion also affects the induction reception effect, and the driving voltage must also be increased.

The touch control driving method and device of this embodiment compensates for the adverse consequences caused by the attenuation of the circuit signal of the transmitting electrode through high voltage driving. The so-called high voltage driving is a relative term. The high voltage here is generally in the range of 6-30V, which is for the commonly used voltage of 3.3-5V for microelectronic circuits or integrated circuits, not the commonly said high voltage.

FIG4 is a flow chart of a first touch control driving method in this embodiment, and the touch control driving method includes the following steps:

Step 401: The drive controller calculates the reference signal parameters of the touch electrode on the emission electrode line based on the reference voltage and the emission electrode line.

Step 402: Calculate the compensation signal parameters according to the demand signal parameters and the reference signal parameters of the touch electrodes, and control and generate the step compensation input voltage according to the compensation signal parameters of each touch electrode.

Step 403: The reference signal parameters and the ladder compensation input voltage are processed by a voltage amplifier to obtain an amplified driving signal.

Step 404: When the amplified driving signal reaches or exceeds the preset output signal parameter threshold, discharge is performed according to a preset discharge strategy to obtain an emission driving signal, and the emission driving signal is output to the emission electrode line. The discharge strategy is to establish a corresponding relationship in advance according to the reference signal parameters and the parameters of the emission electrode line. When in use, the corresponding discharge strategy can be obtained by comparing the reference signal parameters with the parameters of the emission electrode line.

This method can be used to compensate for the difference in ITO lead resistance from the proximal end to the distal end of the emission channel, and it can also be achieved that ITO electrodes with different square resistances also require different driving voltages and discharge constants.

In some optional embodiments, as shown in Figure 5, it is a schematic flow chart of the second touch driving method in this embodiment. The difference in Figure 4 is that step 402 is based on the demand signal parameters of the touch electrode. and the reference signal parameters to calculate the compensation signal parameters. The ladder compensation input voltage is generated according to the compensation signal parameters of each touch electrode, which is:

Step 501: Calculate the compensation signal parameters according to the demand signal parameters and the reference signal parameters of the touch electrode.

Step 502: Calculate the voltage given branch combination of the compensation signal according to the compensation signal parameters of each touch electrode and the distribution parameters of the voltage given branches connected in parallel and/or in series.

Step 503: Combine the compensation drive voltage through a transformer given branch to generate a ladder compensation input voltage; wherein the transformer given branch includes: a transformer resistor and a transformer drive switch. Among them, the transformer driven switch may be a MOS controlled switch.

In some optional embodiments, as shown in Figure 6, it is a schematic flowchart of the third touch driving method in this embodiment. The difference in Figure 4 is that in step 404, when the amplified driving signal reaches or exceeds a predetermined When the output signal parameter threshold is set, discharge is performed according to the preset discharge strategy to obtain the emission driving signal, and the emission driving signal is output to the emission electrode line, as:

Step 601: When the amplified driving signal reaches or exceeds a preset output signal parameter threshold, a discharge signal parameter is obtained according to the emission driving signal parameter, the output signal parameter threshold and a preset discharge strategy.

Step 602: Calculate the transformer discharge branch combination of the discharge signal according to the discharge signal parameters combined with the parallel and/or series transformer discharge branch distribution parameters.

Step 603: Combine the amplified drive signals through a transformer discharge branch and perform discharge to obtain a transmit drive signal; wherein the transformer discharge branch includes a discharge resistor and a discharge drive switch.

Step 604: output the transmit drive signal to the transmit electrode line.

In some optional embodiments, as shown in FIG. 7 , which is a schematic flow chart of a fourth touch driving method in this embodiment, the difference from FIG. 6 is that it further includes:

Step 701: Obtain the discharge pulse time and discharge period based on the amplified drive signal and reference signal parameters, and the comparison relationship with the discharge input parameters and adjustment parameters in the discharge strategy.

Step 702: Discharge according to the discharge pulse time and discharge cycle.

In some optional embodiments, as shown in Figure 8, it is a schematic flowchart of the fifth touch driving method in an embodiment of the present invention. The difference in Figure 6 is that it also includes:

Step 801: When a change in the touch electrode on the transmitting electrode line is detected, detect the change reference signal parameter of the increasing/decreasing touch electrode.

Step 802: Calculate updated reference signal parameters based on the changed reference signal parameters and the pre-changed reference signal parameters, and replace the reference signal parameters with the updated reference signal parameters.

In some optional embodiments, as shown in FIG9 , a schematic diagram of the structure of a touch driving device 900 is provided, and the touch driving device is used to implement the above-mentioned touch driving method. The touch driving device 900 includes: a reference voltage input terminal 901, a driving controller 902, a voltage amplifier 903, a driving signal compensation processor 904, a driving signal discharge processor 905, and a driver signal output terminal 906.

Among them, the reference voltage input terminal 901 is connected to the drive signal compensation processor 904 and the voltage amplifier 903, and inputs the reference voltage to the voltage amplifier 903.

The drive controller 902 is connected to the drive signal compensation processor 904, the drive signal discharge processor 905, the reference voltage input terminal 901 and the emitter electrode line 20, and calculates the reference of the touch electrode on the emitter electrode line based on the reference voltage and the emitter electrode line. signal parameters.

The drive controller 902 calculates the compensation signal parameters according to the demand signal parameters and the reference signal parameters of the touch electrodes, and controls and generates the step compensation input voltage according to the compensation signal parameters of each touch electrode. When the amplified driving signal reaches or exceeds the preset output signal parameter threshold, the preset discharge strategy is called.

The drive signal compensation processor 904 is connected to the reference voltage input terminal 901, the voltage amplifier 903 and the drive controller 902, receives and processes the step compensation input voltage, and then transmits it to the voltage amplifier.

The voltage amplifier 903 is connected to the reference voltage input terminal 901, the drive signal compensation processor 904, the drive signal discharge processor 905 and the driver signal output terminal 906. It processes the reference signal parameters and the ladder compensation input voltage to obtain an amplified drive signal.

The drive signal discharge processor 905 is connected to the voltage amplifier 903, the drive controller 902 and the driver signal output terminal 906, performs discharge according to the discharge strategy, and transmits the amplified drive signal after discharge processing to the driver signal output terminal.

The driver signal output terminal 906 is connected to the voltage amplifier 903, the drive signal discharge processor 905 and the emission electrode line 20, receives the discharge-processed amplified driving signal to obtain the emission driving signal, and outputs the emission driving signal to the emission electrode line.

In some optional embodiments, as shown in Figure 10, which is a schematic structural diagram of a touch driving device 1000, the difference from Figure 9 is that the drive signal compensation processor 904 includes greater than or equal to two variables. The voltage given branch 941 and the variable voltage given branch 941 include: a variable voltage resistor 942 and a variable voltage drive switch 943.

The variable voltage resistor 942 is connected to the reference voltage input terminal 901 , the voltage amplifier 903 and the signal control switch 943 ; the variable voltage drive switch 943 is connected to the variable voltage resistor 942 and the drive controller 902 .

The drive controller 902 calculates the compensation signal parameters according to the demand signal parameters and the reference signal parameters of the touch electrodes; calculates the compensation signal parameters according to the compensation signal parameters of each touch electrode in combination with the parallel and/or series voltage transformer given branch distribution parameters. Obtain the parameters of the transformer given branch combination of the compensation signal; control the opening/closing of the corresponding drive switch according to the parameters of the transformer given branch combination;

The transformer given branch combination 944 processes the passed compensation driving voltage to generate a step compensation input voltage.

In some optional embodiments, as shown in Figure 11, which is a schematic structural diagram of a touch driving device 1100, the difference from Figure 9 is that the drive signal discharge processor 905 includes: greater than or equal to two The transformer discharge branch 951 includes a discharge resistor 952 and a discharge drive switch 953 .

Among them, the discharge resistor 952 is connected to the voltage amplifier 903, the driver signal output terminal 906 and the discharge drive switch 953; the discharge drive switch 953 is connected to the discharge resistor 952 and the drive controller 902.

The drive controller 902 detects that when the amplified drive signal reaches or exceeds the preset output signal parameter threshold, it obtains the discharge signal parameters according to the emission drive signal parameters, the output signal parameter threshold and the preset discharge strategy. The parameters of the transformer discharge branch combination of the discharge signal are calculated based on the parameters of the discharge signal combined with the distribution parameters of the parallel and/or series transformer discharge branches; the corresponding discharge drive switch is controlled to turn on/off according to the parameters of the transformer discharge branch combination. closure.

The transformer discharge branch combination 954 performs discharge processing on the passed amplified drive signal to obtain a transmit drive signal, and transmits the transmit drive signal to the driver signal output terminal 906 .

In some optional embodiments, as shown in Figure 12, which is a schematic structural diagram of a touch drive device 1200, the difference from Figure 11 is that the drive controller 902 includes: a compensation voltage drive controller 921, a discharge Drive controller 922 and discharge pulse parameter controller 923. The compensation voltage drive controller 921 is connected to the drive signal compensation processor 904, and controls the opening and closing of the variable voltage drive switch 943 in the drive signal compensation processor; the discharge drive controller 922 is connected to the drive signal discharge processor 905, The opening and closing of the discharge drive switch 953 in the drive signal discharge processor 905 is controlled.

The discharge pulse parameter controller 923 is connected to the drive signal discharge processor 905, and obtains the discharge pulse time and discharge period based on the amplified drive signal and reference signal parameters, and the comparison relationship between the discharge input parameters and the adjustment parameters in the discharge strategy; according to the discharge pulse time And the discharge drive switch corresponding to the discharge cycle control is turned on or off for discharge.

In some optional embodiments, as shown in FIG. 13 , which is a schematic diagram of an emitting electrode driving circuit in a touch driving device in this embodiment, the circuit is divided into three areas A, B, and C by dotted lines, and each area performs a specific function.

The function of area A is a voltage amplifier, the base of Q2 is the input terminal of the amplifier, and the collector of Q1 is the output terminal of the amplifier, which can drive a transmit channel. Area B cooperates with R4 to generate a ladder input voltage that is supplied to the input terminal of the Q2 base amplifier. R5 and Q3 form the given branch of the first section, and R6 and Q4 form the given branch of the second section. When the controller passes IOA1, IOA2 and Different combinations can produce different ladder given voltages when controlling two branches. This figure only draws 2 branches for the convenience of explanation. In actual application, there can be more than 5 branches.

Area C is the discharge control circuit, in which R7 and Q5 form the first discharge branch, and R8 and Q6 form the second discharge branch. When the controller controls the two branches in different combinations through IOB1 and IOB2, different outputs can be generated. Discharge constant. This figure only draws 2 branches for the convenience of explanation. In actual application, more than 5 branches can be used to meet the requirements. The function of the discharge circuit is: because the emitter electrode is in a spatial open-circuit state, under the action of the ITO lead resistance and distributed capacitance, when the amplifier outputs a low level, it is almost in an open-circuit state, and the voltage of the emitter electrode drops slowly (refer to the emitter electrode waveform in Figure 3). Reducing the induction reception effect delays the start of the next drive pulse. The discharge circuit can speed up the falling edge of the pulse. Multi-branch ladder input voltage and discharge control can compensate for the difference in resistance of the ITO lead from the near end to the far end of the emission channel, meeting the needs of ITO electrodes with different square resistances for different driving voltages and discharge constants.

The controller in Figure 13 controls the output pulse voltage value of the voltage amplifier by adjusting IOA1 and IOA2. The internal resistance of the amplifier is relatively low and the pulse front edge is steep. When the amplifier outputs low voltage, IOB1 and IOB2 adjust the discharge time to improve the pulse falling edge time. The pulse time and period can be adjusted by a combination of controllers. Through circuit analysis and testing, it is also possible to increase or decrease the emission electrode line, and automatically adjust the compensation input voltage and discharge control parameters.

The touch driving device of this embodiment can generate a pulse voltage with an amplitude of 6-30V and a step-adjustable amplitude; the pulse width is adjustable from 0.01-10ms (milliseconds), and the pulse interval is adjustable from 1-10ms (milliseconds); the maximum output current is 2mA (milliamps). ); the rising and falling edges of the pulse should be as steep as possible; the driver can input a stable DC voltage of 35V and a maximum current of 30mA (milliamps).

This circuit only draws the circuit of one drive channel. In actual design, the number of drive channels is generally equal to the number of emitter electrodes. The circuit parameters in this figure are the parameters of a specific device combination. If the relevant devices change, the corresponding parameters may need to be changed.

In some optional embodiments, a touch panel is also provided, including the above-mentioned touch drive device. The touch panel includes: a substrate, the substrate includes a touch area and a non-touch area surrounding the touch area; a plurality of transmitting electrode lines arranged along a first direction (horizontal direction) and a plurality of receiving electrode lines arranged along a second direction (vertical direction) are arranged in the touch area. The touch drive device is connected to the transmitting electrode line through a signal line, and preferably, each transmitting electrode line has a corresponding touch drive device connected thereto. The touch panel can be used in a touch display device, and the touch display device includes but is not limited to any product or component with a display function, such as a mobile phone, a tablet computer, a display, a laptop computer, etc.

The beneficial effects achieved by the touch driving method, the touch driving device and the touch panel in this embodiment are as follows:

(1) The touch driving method, touch driving device and touch panel of the present application control the voltage input and output control through the driving controller, and combine with the voltage amplifier to generate step voltage input or discharge, so that the driver signal output terminal output meets the touch The pulse voltage required by the screen control circuit compensates for the resistance difference in the touch screen circuit from the transmitting channel from the near end to the far end ITO lead, thereby overcoming the problem of drive signal attenuation in the touch screen.

(2) The touch driving method, touch driving device and touch panel of the present application control voltage input and output control through a driving controller, combined with a voltage amplifier, to control and compensate for the attenuation of the driving signal in the touch screen. It can also be used according to different methods. The resistive ITO electrodes are also set to control different driving voltages and discharge constants to meet different specific touch drive control needs.

(3) The touch driving method, touch driving device and touch panel of this application control voltage input and output control through a drive controller, combined with a voltage amplifier, to control and compensate for the attenuation of the drive signal in the touch screen. According to different touch screens The size and shape can be controlled and adjusted by driving voltage and discharge constant. There is no need to design a corresponding drive control for each touch screen, and it can be applied to touch screen drive control of various specifications.

Although the preferred embodiments of the present application have been described, those skilled in the art will be able to make additional changes and modifications to these embodiments once the basic inventive concepts are apparent. Therefore, it is intended that the appended claims be construed to include the preferred embodiments and all changes and modifications that fall within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (8)

1. The touch control driving method is characterized by comprising the following steps of:

the driving controller calculates reference signal parameters of the touch electrode on the transmitting electrode wire according to the reference voltage and the transmitting electrode wire;

calculating a compensation signal parameter according to the demand signal parameter and the reference signal parameter of the touch electrode, and controlling to generate a step compensation input voltage according to the compensation signal parameter of each touch electrode;

processing the reference signal parameter and the step compensation input voltage through a voltage amplifier to obtain an amplified driving signal;

when the amplified driving signal reaches or exceeds a preset output signal parameter threshold, discharging according to a preset discharging strategy to obtain a transmitting driving signal, and outputting the transmitting driving signal to the transmitting electrode wire,

calculating a compensation signal parameter according to the demand signal parameter and the reference signal parameter of the touch electrode, and controlling to generate a step compensation input voltage according to the compensation signal parameter of each touch electrode, wherein the step compensation input voltage comprises the following steps:

calculating to obtain a compensation signal parameter according to the demand signal parameter of the touch electrode and the reference signal parameter;

according to the compensation signal parameters of the touch electrodes, combining parallel and/or serial transformation given branch distribution parameters to calculate and obtain a transformation given branch combination of the compensation signal;

combining the compensation driving voltage through the given voltage transformation branch to generate a step compensation input voltage; wherein the transforming a given branch comprises: a variable resistor and a variable drive switch.

2. The touch driving method according to claim 1, wherein when the amplified driving signal reaches or exceeds a preset output signal parameter threshold, discharging is performed according to a preset discharging strategy and an emission driving signal is obtained, which is:

when the amplified driving signal reaches or exceeds a preset output signal parameter threshold, a discharge signal parameter is obtained according to the emission driving signal parameter, the output signal parameter threshold and a preset discharge strategy;

according to the discharge signal parameters, combining the parallel and/or serial variable-voltage discharge branch distribution parameters, and calculating to obtain a variable-voltage discharge branch combination of the discharge signal;

the amplified driving signals are combined through the transformation discharge branch circuit to be discharged to obtain emission driving signals; wherein, the transformation discharge branch circuit includes: a discharge resistor and a discharge driving switch.

3. The touch driving method according to claim 2, further comprising:

according to the amplified driving signal and the reference signal parameters, obtaining a discharge pulse time and a discharge period according to a comparison relation between the amplified driving signal and the reference signal parameters and the discharge input parameters and the adjustment parameters in the discharge strategy;

and discharging according to the discharge pulse time and the discharge period.

4. A touch driving method according to any one of claims 1 to 3, further comprising: detecting the change reference signal parameters of increased/decreased touch electrodes when the touch electrodes on the transmitting electrode line are detected to change;

and calculating an updated reference signal parameter according to the changed reference signal parameter and the reference signal parameter before change, and replacing the reference signal parameter with the updated reference signal parameter.

5. A touch driving device, comprising: the device comprises a reference voltage input end, a driving controller, a voltage amplifier, a driving signal compensation processor, a driving signal discharging processor and a driver signal output end; wherein,

the reference voltage input end is connected with the driving signal compensation processor and the voltage amplifier and inputs reference voltage to the voltage amplifier;

the driving controller is connected with the driving signal compensation processor, the driving signal discharge processor, the reference voltage input end and the transmitting electrode wire, and calculates reference signal parameters of the touch electrode on the transmitting electrode wire according to the reference voltage and the transmitting electrode wire;

calculating a compensation signal parameter according to the demand signal parameter and the reference signal parameter of the touch electrode, and controlling to generate a step compensation input voltage according to the compensation signal parameter of each touch electrode;

when the amplified driving signal reaches or exceeds a preset output signal parameter threshold value, a preset discharge strategy is called;

the driving signal compensation processor is connected with the reference voltage input end, the voltage amplifier and the driving controller, receives and processes the step compensation input voltage and then transmits the step compensation input voltage to the voltage amplifier;

the voltage amplifier is connected with the reference voltage input end, the driving signal compensation processor, the driving signal discharging processor and the driver signal output end, and is used for processing the reference signal parameters and the step compensation input voltage to obtain an amplified driving signal;

the driving signal discharging processor is connected with the voltage amplifier, the driving controller and the driver signal output end, discharges according to the discharging strategy and transmits the amplified driving signal after the discharging treatment to the driver signal output end;

the driver signal output end is connected with the voltage amplifier, the driving signal discharge processor and the transmitting electrode wire, receives the amplified driving signal after discharge processing to obtain a transmitting driving signal, outputs the transmitting driving signal to the transmitting electrode wire,

the driving signal compensation processor comprises more than or equal to two transformation given branches, wherein the transformation given branches comprise: a variable voltage resistor and a variable voltage drive switch; wherein,

the voltage transformation resistor is connected with the reference voltage input end, the voltage amplifier and the voltage transformation driving switch; the variable-voltage driving switch is connected with the variable-voltage resistor and the driving controller;

the driving controller calculates and obtains compensation signal parameters according to the demand signal parameters of the touch electrode and the reference signal parameters;

according to the compensation signal parameters of the touch electrodes, combining parallel and/or serial transformation given branch distribution parameters to calculate and obtain a transformation given branch combination of the compensation signal; controlling the corresponding variable-voltage driving switch to be turned on/off according to the variable-voltage given branch combination;

and transforming the given branch combination, and processing the compensation driving voltage to generate a step compensation input voltage.

6. The touch driving device according to claim 5, wherein the driving signal discharging processor comprises: more than or equal to two voltage transformation discharge branches, said voltage transformation discharge branches comprising: a discharge resistor and a discharge driving switch; wherein,

the discharge resistor is connected with the voltage amplifier, the driver signal output end and the discharge driving switch; the discharge driving switch is connected with the discharge resistor and the driving controller;

the driving controller detects that when the amplified driving signal reaches or exceeds a preset output signal parameter threshold, a discharge signal parameter is obtained according to the transmitted driving signal parameter, the output signal parameter threshold and a preset discharge strategy;

according to the discharge signal parameters, combining the parallel and/or serial variable-voltage discharge branch distribution parameters, and calculating to obtain a variable-voltage discharge branch combination of the discharge signal; controlling the corresponding discharge driving switch to be turned on/off according to the voltage transformation discharge branch circuit combination;

and the transformation discharge branch circuit is used for carrying out discharge treatment on the amplified driving signals to obtain emission driving signals, and transmitting the emission driving signals to the signal output end of the driver.

7. The touch driving device according to claim 6, wherein the driving controller comprises: a compensation voltage driving controller, a discharge driving controller and a discharge pulse parameter controller;

the compensation voltage driving controller is connected with the driving signal compensation processor; the discharge driving controller is connected with the driving signal discharge processor;

the discharge pulse parameter controller is connected with the drive signal discharge processor, and obtains discharge pulse time and discharge period according to the amplified drive signal and the reference signal parameters and the comparison relation between the discharge input parameters and the adjustment parameters in the discharge strategy; and controlling the corresponding discharge driving switch to be opened or closed for discharging according to the discharge pulse time and the discharge period.

8. A touch panel comprising the touch driving device according to any one of claims 5 to 7.