WO2022056860A1

WO2022056860A1 - Touch chip, coding method and electronic device

Info

Publication number: WO2022056860A1
Application number: PCT/CN2020/116273
Authority: WO
Inventors: 沈海明; 张冠军
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2022-03-24

Abstract

A touch chip, a coding method and an electronic device, which are capable of reducing the influence between a touch layer and a display layer of a screen. The touch chip comprises a drive circuit. The drive circuit is used to: within a first time interval, output a coding signal to the touch layer of the screen, wherein one field scanning period of a field synchronization signal of the display layer of the screen comprises: the pulse width of the field synchronization signal, the back porch of the field synchronization signal, an effective signal interval in the field scanning period, and the front porch of the field synchronization signal; the effective signal interval is a time interval for updating pixel data of the display layer in the field scanning period; and the first time interval comprises the pulse width of the field synchronization signal, the back porch of the field synchronization signal, and the front porch of the field synchronization signal.

Description

Touch chip, coding method and electronic device

technical field

The embodiments of the present application relate to the field of information technology, and more particularly, to a touch control chip, a coding method, and an electronic device.

Background technique

Nowadays, the screens of electronic devices are designed to be thinner and thinner, in order to reduce the thickness of the electronic device, or to allow more space in the electronic device to accommodate other internal components within the same thickness. However, after the screen becomes thinner, the signal of the touch layer in the screen will affect the display image presented by the display layer, or the signal transmission of the display layer will affect the touch detection of the touch layer, etc., thus affecting the user. experience.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a touch chip, a coding method and an electronic device, which can reduce the influence between the touch layer and the display layer of the screen.

In a first aspect, a touch control chip is provided, including a drive circuit, and the drive circuit is used for:

In the first time interval, output the coding signal to the touch layer of the screen;

Wherein, one field scan period of the field synchronization signal of the display layer of the screen includes: the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the field scan period The valid signal interval within and the front shoulder of the field sync signal;

The valid signal interval is a time interval for updating pixel data of the display layer in the field scanning period, and the first time interval includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal , and the front shoulder of the field sync signal.

In a possible implementation manner, the vertical scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, wherein when the first time interval is not sufficient for transmitting the coding signal , the driving circuit is further configured to: output the coding signal to the touch layer in at least one line scan period adjacent to the first time interval; and/or, in the same period as the first time interval The coding signal is output to the touch control layer during at least one line scan period adjacent to the first time interval.

In a possible implementation manner, the touch control chip further includes a detection circuit, and the detection circuit is configured to: within the first time interval, receive a detection signal from the touch control layer.

In a possible implementation manner, the pulse width of the vertical synchronization signal, the back shoulder of the vertical synchronization signal, the effective signal interval, and the front shoulder of the vertical synchronization signal all include an integer number of the display The line scan period of the layer's line sync signal.

In a possible implementation manner, the number of the line scanning periods included in the effective signal interval is equal to the line resolution of the display screen of the display layer.

In a second aspect, a coding method is provided, including:

Get the first time interval;

In the first time interval, output a coding signal to the touch layer of the screen;

In a possible implementation manner, the vertical scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, wherein when the first time interval is not sufficient for transmitting the coding signal , the method further includes: outputting the coding signal to the touch layer in at least one line scan period adjacent to the first time interval; and/or, in the first time interval and the first The coding signal is output to the touch control layer in at least one line scan period after the adjacent time interval.

In a possible implementation manner, the method further includes: within the first time interval, receiving a detection signal from the touch control layer.

In a third aspect, a fingerprint chip is provided for:

In the first time interval, fingerprint detection is performed on the finger above the screen;

In a possible implementation manner, the fingerprint chip is a capacitive fingerprint chip, and the fingerprint chip includes a driving circuit, and the driving circuit is configured to: within the first time interval, output a fingerprint for fingerprint detection. code signal.

In a possible implementation manner, the fingerprint chip is an optical fingerprint chip, the fingerprint chip includes an optical path guide structure and a fingerprint sensor located under the optical path guide structure, and the optical path guide structure is used to The fingerprint image is imaged to the fingerprint sensor, and the fingerprint sensor is used to collect the fingerprint image of the finger within the first time interval.

In a fourth aspect, an electronic device is provided, comprising:

screen; and,

A touch control chip in the first aspect or any possible implementation manner of the first aspect and/or a fingerprint chip in the third aspect or any possible implementation manner of the third aspect.

Based on the above technical solution, the field scanning period of the field synchronization signal of the display layer includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, the effective signal interval, and the front shoulder of the field synchronization signal, but because the display layer is only in the The pixel data is updated within the valid signal interval of Layer output coding signal, so that the coding signal of the touch layer will not affect the update of the pixel data of the display layer, and at the same time, the display layer will not affect the touch detection of the touch layer when the pixel is updated. .

Description of drawings

FIG. 1 is a schematic diagram of a screen module.

FIG. 2 is a schematic diagram of the relationship among the line synchronization signal, pixel data, display layer noise and touch detection signal.

FIG. 3 is a schematic diagram showing the variation law of layer noise with coding time.

FIG. 4 is a schematic diagram of a first time interval.

FIG. 5 is a schematic diagram of a first time interval corresponding to a specific mobile phone.

FIG. 6 is a schematic block diagram of a touch control chip according to an embodiment of the present application.

FIG. 7 is a schematic diagram of a coding sequence based on the touch chip shown in FIG. 6 .

FIG. 8 is a schematic diagram of a coding sequence when the first time interval is insufficient for transmitting a coding signal.

FIG. 9 is a schematic flowchart of a coding method according to an embodiment of the present application.

detailed description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

Today, the screens of electronic devices are being made thinner and thinner to reduce the thickness of the electronic device, or to allow more space in the electronic device to accommodate other internal components within the same thickness. Among them, the conversion of the type of the screen from a liquid crystal display (LCD) to an organic light emitting diode (Organic Light Emitting Diode, OLED) display is a typical trend. However, after the OLED screen becomes thinner, the basic capacitance of the touch electrodes in the touch layer of the screen increases, and the noise coupled from the display layer to the touch layer increases, which directly affects the performance and sensitivity of touch detection. . At the same time, when performing touch detection or fingerprint detection, the touch coding signal input to the touch layer (hereinafter referred to as the coding signal, or referred to as the driving signal) will also affect the pixel update of the display layer, resulting in Water ripples appear.

Figure 1 shows a schematic diagram of the screen module. The touch layer and the display layer in the screen module are usually two independent and separate systems. In theory, there may be no or little interference between them. However, as today's screens are getting thinner and thinner, the touch electrodes in the touch layer are closer to the system ground, so that the self-capacitance of the touch electrodes to the system ground has increased from about 100pF before to about 500pF now. As a result, the interaction between the touch layer and the display layer cannot be ignored.

As shown in Figure 1, the signal generated by the display driver chip is transmitted to the display layer of the screen module, and is coupled to the system ground of the touch layer and the display layer through the parasitic capacitance C _D of the trace, and then passes through the touch layer in the touch layer. The ground capacitances C _sg and C _dg of the control electrodes are coupled to the touch layer, so that display layer noise is formed on the touch layer, and finally coupled to the touch chip, thereby affecting the performance of touch detection.

It should be understood that the coding signal described in the embodiments of the present application refers to the coding signal output by the touch control chip during the touch detection, including the coding signal input to the touch layer; A control signal that controls other circuits in the touch detection, such as a trigger signal that triggers the sampling circuit to sample the detection signal.

FIG. 2 shows the relationship among the line synchronization signal (referred to as Hsync signal), pixel data, display layer noise, and touch detection signal (hereinafter also referred to as detection signal for short). As shown in FIG. 2 , the display driver chip uses the Hsync signal as the clock to update the pixel data (or display data) of each row of pixels in the display layer, and the display layer noise is generated when the pixel data is refreshed, so the display layer noise is synchronized with the Hsync signal. In order to solve the influence of the display layer noise on the touch detection of the touch layer, the coding signal output by the touch chip can be synchronized with the Hsync signal during touch detection, so as to weaken the influence of the display layer noise to a certain extent. The interference of touch detection finally causes the detection signal received by the touch chip to be synchronized with the Hsync signal, that is, to maintain a constant phase difference. For example, as shown in FIG. 2 , a detection signal is acquired during a low-noise period in the line scanning period, that is, a T2 period, and the detection signal is synchronized with the Hsync signal. Based on the detection signal, the user's touch information, such as touch position, touch pressure, etc., can be obtained.

However, during actual testing, it is found that the noise in the touch detection system is not only related to the Hsync signal, but also affected by the vertical synchronization signal of the display layer, that is, the vertical synchronization signal (referred to as Vsync signal). FIG. 3 shows the variation law of the noise in the touch detection system with the coding time. Among them, curve 1 is the variation law of theoretical noise with coding time. It can be seen that with the increase of coding time, the noise gradually decreases. Specifically, the longer the coding time is, the narrower the bandwidth of the demodulated signal obtained after sampling and demodulating the detection signal, and the less total noise entering the passband. For example, when only white noise is considered, 0.5ms coding The theoretical noise under time is the theoretical noise under 1ms coding time

times. From another point of view, the longer the coding time, the longer the demodulation and integral averaging time, the larger the sample data volume, and the smaller the standard deviation. For example, when only white noise is considered, the theoretical noise under 0.5ms coding time is the theoretical noise under 1ms coding time

times.

However, according to the actual detection results, as shown in curve 2 in Figure 3, when the coding time is less than a certain value, the noise in the demodulated signal of the detection signal increases with the coding time. When the value is greater than a certain value, the noise in the demodulation result of touch detection decreases as the coding time increases.

Next, after delaying the time of outputting the coding signal from the time of the rising edge of the Vsync signal for a period of time, as shown in curve 3 in FIG. With the increase of , the noise gradually decreases, which is consistent with the theoretical trend shown in Curve 1.

It can be seen from curve 1 to curve 3 that when the touch detection is triggered at the time of the rising edge of the Vsync signal, the distribution of noise over time does not conform to the theoretical trend. As shown in curve 2, when the coding time changes from 100us to 200us, The noise does not become smaller but becomes larger, and the change rule between the coding time and the noise does not conform to the theoretical trend; and when the touch detection is triggered 1ms after the rising edge of the Vsync signal, the change rule between the coding time and the noise Basically consistent with the theoretical trend. It can be seen that there is also a temporal correlation between the touch detection noise and the Vsync signal.

Usually, the display layer is triggered by the Vsync signal to refresh a frame of display images; the display layer is triggered by the Hsync signal to refresh the pixel data of a row of pixels. Theoretically, the number of pulses of the Hsync signal between every two Vsync signals is equal to the line resolution of the display. The LCD display technology or OLED display technology used in current electronic devices such as mobile phones, tablets, and computers is based on digital image technology, which is derived from the analog display technology represented by old-fashioned CRT displays. Due to historical compatibility issues, LCD display technology and OLED display technology inherit some of the control logic in Cathode Ray Tube (CRT) display technology, resulting in the number of Hsync signal pulses between every two Vsync signals being larger than the display screen. line resolution.

As shown in FIG. 4, the timing relationship among Vsync signal, Hsync signal and display noise, in one field scanning period of Vsync signal, for example, two adjacent Vsync signals in FIG. 4, namely the first Vsync signal and the second Vsync signal Between the rising edges of the Vsync signal, it includes: the pulse width of the first Vsync signal, the vertical back porch (VBP) of the first Vsync signal, the valid signal interval, and the vertical front of the first Vsync signal. Shoulder (Vertical Front Porch, VFP). Hereinafter, the vertical rear shoulder is simply referred to as the rear shoulder, and the vertical front shoulder is simply referred to as the front shoulder.

The valid signal interval is the time interval used to update the pixel data of the display layer. During the valid signal interval, the display layer updates the pixel data, and only then will the data signal be input to the pixel circuit of the display layer and then sent to the touch layer. Introduces display layer noise. During the time between the front shoulder and the rear shoulder, the display layer does not update pixel data, so no display layer noise is introduced to the touch layer.

In this embodiment of the present application, the pulse width of the first Vsync signal, the back shoulder of the first Vsync signal, and the front shoulder of the first Vsync signal in one field scanning period shown in FIG. 4 are referred to as the first time interval . That is, the first time interval is a time interval other than the valid signal interval in each field scanning period.

The pulse width of the field synchronization signal is the time occupied by the pulses of the field synchronization signal.

Taking FIG. 5 as an example, the first time interval corresponding to a certain model of mobile phone is shown. The pulse width of a field synchronizing signal of the display layer of the screen of the mobile phone is equal to one line scanning period of the line synchronizing signal. scan cycle. Therefore, the first time interval shown in FIG. 5 includes 24 line scanning periods. Each line scan period is about 5.6us, and the first time interval is 134us.

In this embodiment of the present application, the first time interval is used for touch detection, so as to avoid mutual interference between the touch layer and the display layer. A detailed description will be given below with reference to FIGS. 6 to 8 .

FIG. 6 shows a touch control chip 600 according to an embodiment of the present application. The touch chip 600 is used for performing touch detection in the first time interval.

Optionally, the touch chip 600 includes a drive circuit 610 for outputting a touch coding signal to the touch layer of the screen within the first time interval.

Optionally, the touch control chip 600 includes a detection circuit 620 for receiving the detection signal output by the touch control layer within the first time interval.

It should be understood that, during the touch detection period, the driving circuit 610 outputs the coding signal and the detection circuit 620 receives the corresponding detection signal within the first time interval. Generally, while the driving circuit 610 outputs the coding signal, the detection circuit 620 receives the detection signal output from the touch layer. The detection signal carries the user's touch information, such as the capacitance change of the touch electrode caused by the user's touch. After subsequent processing of the detection signal, the user's touch information can be obtained.

Wherein, one field scanning period of the field synchronizing signal of the display layer of the screen includes: the pulse width of the field synchronizing signal in the field scanning period, the back shoulder of the field synchronizing signal, the valid signal interval in the field scanning period, and The front shoulder of the field sync signal.

The valid signal interval is the time interval used for updating the pixel data of the display layer in the field scanning period. As shown in the aforementioned FIG. 4 , in one field scanning period, the first time interval includes the first field in chronological order. The pulse width of the sync signal, the trailing shoulder of the first field sync signal, and the leading shoulder of the first field sync signal.

A field scanning period of the field synchronization signal of the display layer includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, the effective signal interval, and the front shoulder of the field synchronization signal, but because the display layer is only valid in it. The pixel data is updated in the signal interval, therefore, the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, and the front shoulder of the field synchronization signal are taken as the first time interval, and the touch point is sent to the touch sensor in the first time interval. The control layer outputs a coding signal, so that the display layer will not affect the touch detection of the touch layer when the pixel is updated, and at the same time, the coding signal of the touch layer will not affect the update of the pixel data of the display layer. .

Wherein, the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the valid signal interval in the field scan period, and the front shoulder of the field synchronization signal, each include an integer number of line scan periods, For example, as shown in Figure 4 and Figure 5.

The number of line scanning periods included in the field scanning period is greater than the line resolution of the display screen of the display layer, and the number of line scanning periods included in the effective signal interval is usually equal to the line resolution of the display screen of the display layer. It should be understood that the number of line scanning periods included in the valid signal interval can also be greater than the line resolution of the display screen. For example, for an electronic device that supports a resolution of 2960×1440, the resolution of the display screen can be set to After the resolution of the display screen is reduced, the relative position of the effective signal interval remains unchanged, except that every two rows of pixels present one row of pixel data.

For example, as shown in FIG. 7 , taking the first time interval formed by the front shoulder of the first field synchronization signal, the pulse width of the second field synchronization signal, and the rear shoulder of the second field synchronization signal as an example, the touch The chip 600 may perform touch detection, such as self-capacitance detection, mutual capacitance detection, or send an uplink signal to the active pen within the first time interval. It should be understood that, in this embodiment of the present application, operations such as fingerprint detection, such as capacitive fingerprint detection or optical fingerprint detection, may also be performed within the first time interval.

The moment when the touch control chip 600 outputs the corresponding coding signal to the touch layer can be triggered by a certain line synchronization signal in the first time interval shown in FIG. 7 , or starts at any moment in the first time period. Output the coding signal, and finish coding before the end time of the back shoulder of the second field synchronization signal. In this way, since the pixel data is not updated in the display layer during the first time interval, and no data signal is input, it can be ensured that the touch detection will not be affected by the noise from the display layer; at the same time, the coding of the touch layer The signal also does not affect the update of the pixel data of the display layer.

There is a situation, when the time of touch detection or fingerprint detection exceeds the length of the first time interval, that is, when the first time interval is not enough for transmitting the coding signal output in the current touch detection, in a possible In an implementation manner, the driving circuit 610 may output a coding signal to the touch layer in at least one line scan period adjacent to the first time interval; and/or, in at least one next time interval adjacent to the first time interval. During the line scan period, a coding signal is output to the touch layer.

It should be understood that at least one line scanning period extended forward or backward is a part or all of the line scanning period in the valid signal interval.

For example, as shown in FIG. 8 , when the first time interval shown in FIG. 8 is not sufficient for transmitting the coding signal for touch detection, the time for outputting the coding signal can be based on the start of the front shoulder of the first field synchronization signal The time extends forward; or extends backward based on the ending time of the rear shoulder of the second field synchronization signal; or extends forward for a period of time based on the start time of the front shoulder of the first field synchronization signal, and at the same time is based on the second field synchronization signal. The end of the back shoulder extends back for a while. Thus, it is ensured that the coding signal of the current touch detection can be continuously output. It should be understood that FIG. 7 and FIG. 8 only show the first time interval formed by the front shoulder of the first field sync signal, the pulse width of the second field sync signal, and the back shoulder of the second field sync signal.

It can be seen that in the first time interval, there is no mutual influence between the touch layer and the display layer. However, in at least one line scanning period extending forward or backward based on the first time interval, there may be mutual influence between the display layer and the touch layer.

To this end, in an implementation manner, the detection circuit 620 may receive the detection signal output from the touch layer during the second time interval within the previous at least one line scanning period; and/or, at least one line scanning period after the In the second time interval, the detection signal output by the touch layer is received. Therefore, the mutual influence between the display layer and the touch layer during the extended time is eliminated to a certain extent.

In the extended preceding at least one line scanning period and/or the following at least one line scanning period, each line scanning period may include a second time interval, wherein the second time interval is divided by the line scanning period A time interval other than the time interval in which the pixel data of the display layer is updated. For example, the second time interval may be the T2 period shown in FIG. 2 , and the detection circuit 620 may acquire the detection signal during the T2 period.

Of course, the detection circuit 620 may also acquire detection signals from the touch layer during the T2 period in each row scanning period of the first time interval and in the T2 period in each row scanning period extended based on the first time interval.

The above-mentioned first time interval may also be referred to as an absolute low-noise interval, and the second time interval may also be referred to as a relatively low-noise interval.

In the embodiment of the present application, the time of touch detection or fingerprint detection is set in the first time interval within the field scanning period of the display layer. Since the pixel data of the display layer is not refreshed during the first time interval, the touch detection Or fingerprint detection will not be affected by the signal transmission of the display layer, and the display layer will not be affected by the coding signal of the touch layer when the pixel data is updated within the valid signal interval.

Table 1 shows the touch detection results obtained when the coding scheme of the embodiment of the present application is adopted. Assuming that the touch detection time is 150us, the coding signal of the touch detection is used for self-capacitance detection. As shown in Table 1, when touch detection is performed within the valid signal interval in the field scanning period of the display layer, the signal-to-noise ratio (SNR) of the detection signals in the low-noise, medium-noise and high-noise scenes are respectively are 4.76, 3.30, and 0.08; when performing touch detection in the first time interval, the SNRs in low-noise, medium-noise, and high-noise scenes are 6.67, 6.67, and 6.25, respectively. Therefore, by using the touch coding solution of the embodiments of the present application, the performance of touch detection can be improved by 1.4, 2.2 and 78.1 times respectively in low noise, medium noise and high noise scenarios.

Table I

It can be seen from Table 1 that performing touch detection in the first time interval can well eliminate the influence of display layer noise on touch detection and improve the signal-to-noise ratio of touch detection results. Among them, the display layer noise is higher When the touch coding scheme of the embodiment of the present application is adopted, the performance of the detection result is more significantly improved; and, when the touch detection is performed in the first time interval, the display layer does not update the pixel data, Therefore, the coding signal in the touch detection process will not affect the display image of the display layer, and the display layer will not appear water ripples.

The present application also provides a coding method. As shown in FIG. 9 , the method 900 may be performed by the above-mentioned touch control chip 600 . The method 900 includes some or all of the following steps.

In step 910, a first time interval is obtained.

In step 920, within the first time interval, a coding signal is output to the touch layer of the screen.

Wherein, one field scan period of the field synchronization signal of the display layer of the screen includes: the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the field scan period The valid signal interval within and the leading shoulder of the field sync signal.

The valid signal interval is a time interval for updating pixel data of the display layer in the field scanning period, and the first time interval includes the pulse width of the vertical synchronization signal, the a rear shoulder, and a front shoulder of the field sync signal.

One field scanning period of the field synchronization signal of the display layer includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, the valid signal interval, and the front shoulder of the field synchronization signal, but because the display layer is only in the valid signal interval The pixel data is updated in the first time interval. Therefore, the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, and the front shoulder of the field synchronization signal are used as the first time interval, and the coding is output to the touch layer within the first time interval. The signal can prevent the display layer from affecting the touch detection of the touch layer when updating the pixels, and at the same time prevent the coding signal of the touch layer from affecting the update of the pixel data of the display layer.

Optionally, in an implementation manner, the vertical scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, wherein when the first time interval is not enough for transmitting the When the code signal is generated, the method further includes: outputting the code signal to the touch layer during at least one line scan period adjacent to the first time interval; and/or, in the same period as the first time interval The coding signal is output to the touch control layer during at least one line scan period adjacent to the first time interval.

Optionally, in an implementation manner, the method further includes: within the first time interval, receiving a detection signal from the touch control layer

Optionally, in an implementation manner, the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, the valid signal interval, and the front shoulder of the field synchronization signal all include an integer number of The line scanning period of the line synchronization signal of the display layer.

Optionally, in an implementation manner, the number of the line scanning periods included in the valid signal interval is equal to the line resolution of the display screen of the display layer.

It should be understood that for the specific description of the method 900 , reference may be made to the related descriptions of the touch control chip 600 in the foregoing FIG. 6 to FIG. 8 , which are not repeated here for brevity.

The present application also provides a fingerprint chip, which is used for: performing fingerprint detection on a finger above the screen within a first time interval.

Optionally, in an implementation manner, the fingerprint chip is a capacitive fingerprint chip, and the fingerprint chip includes a driving circuit, and the driving circuit is configured to: in the first time interval, output an output for fingerprint detection coding signal.

For example, as shown in the last line of Figure 7, as a schematic diagram, Figure 7 only shows one pulse of the coding signal, and in the actual fingerprint detection, the driving circuit will output a continuous coding signal, but the coding time is usually shorter than the touch The coding time during detection.

Optionally, in an implementation manner, the fingerprint chip is an optical fingerprint chip, and the fingerprint chip includes an optical path guiding structure and a fingerprint sensor located under the optical path guiding structure. The optical path guiding structure is used for imaging the fingerprint image of the finger to the fingerprint sensor, and the fingerprint sensor is used for collecting the fingerprint image of the finger within the first time interval.

It should be understood that for the specific description of the first time interval during fingerprint detection, reference may be made to the related descriptions of the touch control chip 600 in the foregoing FIG. 6 to FIG. 8 , which are not repeated here for brevity.

The embodiment of the present application further provides an electronic device, the electronic device includes: a screen; and the touch chip in the above-mentioned various embodiments of the present application.

As an example and not a limitation, the electronic device in the embodiments of the present application may be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a notebook computer, a desktop computer, a game device, a vehicle-mounted electronic device, or a wearable smart device, and Electronic databases, automobiles, bank ATMs (Automated Teller Machine, ATM) and other electronic devices. The wearable smart device includes full functions, large size, and can realize complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as various types of smart bracelets, smart jewelry and other equipment for physical monitoring.

It should be noted that, on the premise of no conflict, each embodiment described in this application and/or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the protection scope of this application .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application, and those skilled in the art can Various improvements and modifications can be made, and these improvements or modifications all fall within the protection scope of the present application.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A touch control chip, characterized in that it includes a drive circuit, and the drive circuit is used for:

In the first time interval, output the coding signal to the touch layer of the screen;

Wherein, one field scan period of the field synchronization signal of the display layer of the screen includes: the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the field scan period The valid signal interval within and the front shoulder of the field sync signal;

The valid signal interval is a time interval for updating pixel data of the display layer in the field scanning period, and the first time interval includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal , and the front shoulder of the field sync signal.
The touch control chip according to claim 1, wherein the vertical scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, wherein when the first time interval is not enough for When transmitting the coding signal, the driving circuit is also used for:

outputting the coding signal to the touch control layer in at least one line scan period adjacent to the first time interval; and/or,

The coding signal is output to the touch control layer in at least one line scanning period adjacent to the first time interval.
The touch control chip according to claim 1 or 2, wherein the touch control chip further comprises a detection circuit, and the detection circuit is used for:

During the first time interval, a detection signal is received from the touch layer.
The touch control chip according to any one of claims 1 to 3, wherein the pulse width of the vertical synchronization signal, the back shoulder of the vertical synchronization signal, the effective signal interval, and the vertical synchronization The front shoulder of the signal includes an integer number of line scan periods of the line synchronization signal of the display layer.
The touch control chip according to claim 4, wherein the number of the line scan periods included in the effective signal interval is equal to the line resolution of the display screen of the display layer.
A coding method, characterized in that, comprising:

Get the first time interval;

In the first time interval, output a coding signal to the touch layer of the screen;

Wherein, one field scan period of the field synchronization signal of the display layer of the screen includes: the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the field scan period The valid signal interval within and the front shoulder of the field sync signal;

The valid signal interval is a time interval for updating pixel data of the display layer in the field scanning period, and the first time interval includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal , and the front shoulder of the field sync signal.
6. The method according to claim 6, wherein the vertical scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, wherein when the first time interval is not enough for transmitting all the line scanning periods When the coding signal is described, the method further includes:

outputting the coding signal to the touch control layer in at least one line scan period adjacent to the first time interval; and/or,

The coding signal is output to the touch control layer in at least one line scanning period adjacent to the first time interval.
The method according to claim 6 or 7, wherein the method further comprises:

During the first time interval, a detection signal is received from the touch layer.
The method according to any one of claims 6 to 8, wherein the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal, the effective signal interval, and the duration of the field synchronization signal The front shoulders each include an integer number of line scan periods of the line synchronization signal of the display layer.
The method according to claim 9, wherein the number of the line scanning periods included in the valid signal interval is equal to the line resolution of the display screen of the display layer.
A fingerprint chip, characterized in that:

In the first time interval, perform fingerprint detection on the finger above the screen;

Wherein, one field scan period of the field synchronization signal of the display layer of the screen includes: the pulse width of the field synchronization signal in the field scan period, the back shoulder of the field synchronization signal, the field scan period The valid signal interval within and the front shoulder of the field sync signal;

The valid signal interval is a time interval for updating pixel data of the display layer in the field scanning period, and the first time interval includes the pulse width of the field synchronization signal, the back shoulder of the field synchronization signal , and the front shoulder of the field sync signal.
The fingerprint chip according to claim 11, wherein the fingerprint chip is a capacitive fingerprint chip, and the fingerprint chip includes a driving circuit, and the driving circuit is used for:

During the first time interval, a coding signal for fingerprint detection is output.
The fingerprint chip according to claim 11, wherein the fingerprint chip is an optical fingerprint chip, and the fingerprint chip comprises an optical path guiding structure and a fingerprint sensor located under the optical path guiding structure,

The optical path guiding structure is used for imaging the fingerprint image of the finger to the fingerprint sensor, and the fingerprint sensor is used for collecting the fingerprint image of the finger within the first time interval.
An electronic device, comprising:

screen; and,

The touch control chip according to any one of the above claims 1 to 5 and/or the fingerprint chip according to any one of the above claims 11 to 13 .