CN111930268B - Touch control chip, code printing method and electronic equipment - Google Patents
Touch control chip, code printing method and electronic equipment Download PDFInfo
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- CN111930268B CN111930268B CN202010988172.XA CN202010988172A CN111930268B CN 111930268 B CN111930268 B CN 111930268B CN 202010988172 A CN202010988172 A CN 202010988172A CN 111930268 B CN111930268 B CN 111930268B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The application provides a touch chip, a coding method and electronic equipment, which can reduce the influence between a touch layer and a display layer of a screen. The touch chip comprises a driving circuit, and the driving circuit is used for: outputting a coding signal to a touch layer of a screen within a first time interval; wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: the pulse width of the field synchronizing signal, the back shoulder of the field synchronizing signal, the effective signal interval in the field scanning period and the front shoulder of the field synchronizing signal; the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
Description
Technical Field
The embodiment of the application relates to the technical field of information, in particular to a touch chip, a coding method and electronic equipment.
Background
Nowadays, screens of electronic devices are designed to be thinner and thinner to reduce the thickness of the electronic devices or to make more space in the electronic devices to accommodate other internal devices at the same thickness. However, after the screen becomes thinner, a signal of the touch layer in the screen may affect a display picture presented by the display layer, or signal transmission of the display layer may affect touch detection and the like of the touch layer, thereby affecting user experience.
Disclosure of Invention
The embodiment of the application provides a touch chip, a coding method and electronic equipment, which can reduce the influence between a touch layer and a display layer of a screen.
In a first aspect, a touch chip is provided, which includes a driving circuit, where the driving circuit is configured to:
outputting a coding signal to a touch layer of a screen within a first time interval;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
In one possible implementation manner, the field scanning period includes a plurality of line scanning periods of the line synchronization signal of the display layer, and when the first time interval is not enough for transmitting the coding signal, the driving circuit is further configured to: outputting the coding signal to the touch layer in at least one previous line scanning period adjacent to the first time interval; and/or outputting the coding signal to the touch layer in at least one subsequent line scanning period adjacent to the first time interval.
In a possible implementation manner, the touch chip further includes a detection circuit, and the detection circuit is configured to: and receiving a detection signal from the touch layer within the first time interval.
In a possible implementation manner, the pulse width of the field sync signal, the back shoulder of the field sync signal, the effective signal interval, and the front shoulder of the field sync signal all include an integer number of line scanning periods of the line sync signal of the display layer.
In one possible implementation, the number of the line scanning periods included in the effective signal interval is equal to a line resolution of a display screen of the display layer.
In a second aspect, a coding method is provided, including:
acquiring a first time interval;
outputting a coding signal to a touch layer of a screen within the first time interval;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
In one possible implementation, the field scanning period includes a plurality of line scanning periods of a line synchronization signal of the display layer, and when the first time interval is insufficient for transmitting the coding signal, the method further includes: outputting the coding signal to the touch layer in at least one previous line scanning period adjacent to the first time interval; and/or outputting the coding signal to the touch layer in at least one subsequent line scanning period adjacent to the first time interval.
In one possible implementation, the method further includes: and receiving a detection signal from the touch layer within the first time interval.
In a possible implementation manner, the pulse width of the field sync signal, the back shoulder of the field sync signal, the effective signal interval, and the front shoulder of the field sync signal all include an integer number of line scanning periods of the line sync signal of the display layer.
In one possible implementation, the number of the line scanning periods included in the effective signal interval is equal to a line resolution of a display screen of the display layer.
In a third aspect, a fingerprint chip is provided for:
in a first time interval, carrying out fingerprint detection on a finger above a screen;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
In one possible implementation, the fingerprint chip is a capacitive fingerprint chip, and the fingerprint chip includes a driving circuit, where the driving circuit is configured to: and outputting a code printing signal for fingerprint detection in the first time interval.
In a possible implementation manner, the fingerprint chip is an optical fingerprint chip, the fingerprint chip includes an optical path guiding structure and a fingerprint sensor located below the optical path guiding structure, the optical path guiding structure is configured to image a fingerprint image of a finger to the fingerprint sensor, and the fingerprint sensor is configured to collect the fingerprint image of the finger in the first time interval.
In a fourth aspect, an electronic device is provided, comprising:
a screen; and the number of the first and second groups,
a touch 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 sync signal of the display layer includes the pulse width of the field sync signal, the back shoulder of the field sync signal, the effective signal interval, and the front shoulder of the field sync signal, but the display layer updates the pixel data only in the effective signal interval, so that the pulse width of the field sync signal, the back shoulder of the field sync signal, and the front shoulder of the field sync signal are used as the first time interval, and the coding signal is output to the touch layer in the first time interval, so that the coding signal of the touch layer does not affect the updating of the pixel data of the display layer, and the display layer does not affect the touch detection of the touch layer when the pixel is updated.
Drawings
FIG. 1 is a diagram of a screen module.
Fig. 2 is a schematic diagram illustrating a relationship between a row synchronization signal, pixel data, display layer noise, and a touch detection signal.
Fig. 3 is a 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 diagram illustrating a first time interval corresponding to a specific mobile phone.
Fig. 6 is a schematic block diagram of a touch chip according to an embodiment of the present application.
Fig. 7 is a schematic diagram of a coding timing sequence based on the touch chip shown in fig. 6.
FIG. 8 is a diagram illustrating a coding sequence when the first time interval is not sufficient for transmitting a coding signal.
Fig. 9 is a schematic flow chart of a coding method according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
Nowadays, screens of electronic devices are being designed to be thinner and thinner to reduce the thickness of the electronic devices or to make more room in the electronic devices to accommodate other internal devices at the same thickness. Among them, the conversion of screen types from a Liquid Crystal Display (LCD) to an Organic Light Emitting Diode (OLED) Display is a typical trend. However, as the OLED screen becomes thinner, the base capacitance of the touch electrode in the touch layer of the screen becomes larger, and noise coupled from the display layer to the touch layer becomes larger, directly affecting the performance and sensitivity of touch detection. Meanwhile, when performing touch detection or fingerprint detection, a touch coding signal (hereinafter referred to as a coding signal or a driving signal) input to the touch layer may also affect pixel update of the display layer, resulting in a water ripple phenomenon in the display screen.
Fig. 1 is a schematic diagram of a screen module, in which a touch layer and a display layer are usually two independent and separate systems, and theoretically, there may be no interference or less interference between them. However, as the screen is thinner and thinner nowadays, the touch electrode in the touch layer is closer to the system ground, so that the self-capacitance of the touch electrode to the system ground is increased from about 100pF before to about 500pF now, and the mutual influence between the touch layer and the display layer cannot be ignored.
As shown in fig. 1, the signal generated by the display driver chip is transmitted to the display layer of the screen module and passes through the parasitic capacitance C of the traceDA system ground coupled to the touch layer and the display layer, and a capacitance to ground C through the touch electrode in the touch layersgAnd CdgCoupled to the touch layer, thereby causing display layer noise to form on the touch layer and ultimately coupled to the touch chip, thereby affecting the performance of touch detection.
It should be understood that the code printing signal described in the embodiment of the present application refers to a code printing signal output by the touch chip during the touch detection period, and includes a code printing signal input to the touch layer; the touch detection circuit also includes a control signal output during the touch detection period for controlling other circuits in the touch detection, for example, a trigger signal for triggering the sampling circuit to sample the detection signal.
Fig. 2 shows a relationship among a row synchronization signal (referred to as Hsync signal), pixel data, display layer noise, and a touch detection signal (hereinafter also simply referred to as detection signal). As shown in fig. 2, the display driving chip updates the pixel data (or called display data) of each row of pixels of the display layer with the Hsync signal as a clock, and the display layer noise is generated during the refresh of the pixel data, so the display layer noise is synchronized with the Hsync signal. In order to solve the influence of display layer noise on touch detection of the touch layer, a code printing signal output by a touch chip and an Hsync signal can be synchronized during touch detection, so that the interference of the display layer noise on the touch detection is weakened to a certain extent, and finally, a detection signal received by the touch chip is also synchronized with the Hsync signal, namely, a constant phase difference is kept. For example, as shown in fig. 2, in a low noise period within the line scanning period, that is, a period of T2, a detection signal is acquired, which is synchronized with the Hsync signal. Based on the detection signal, touch information of the user, such as a touch position, a touch pressure, and the like, can be obtained.
However, in actual detection, it is found that the noise in the touch detection system is also affected by the vertical synchronization signal of the display layer, i.e. the field synchronization signal (referred to as Vsync signal), in addition to the Hsync signal. Fig. 3 shows the variation of noise in a touch detection system with the time of coding. Wherein, the curve 1 is the change rule of the noise along with the coding time in theory. It can be seen that the noise gradually decreases as the coding time increases. Specifically, the longer the coding time, the narrower the bandwidth of the demodulated signal obtained by sampling and demodulating the detection signal, and the less the total noise entering the passband, for example, when only white noise is considered, the theoretical noise at 0.5ms coding time is that at 1ms coding time
And (4) doubling. In other words, the longer the coding time, the longer the demodulation integration averaging time, the larger the sample data size, and the smaller the standard deviation, for example, when only white noise is considered, the theoretical noise at 0.5ms coding time is the theoretical noise at 1ms coding time
And (4) doubling.
However, according to the actual detection result, as shown in curve 2 in fig. 3, when the coding time is less than a certain value, the noise in the demodulation signal of the detection signal increases with the increase of the coding time, and when the coding time is greater than the certain value, the noise in the demodulation result of the touch detection decreases with the increase of the coding time.
Then, after delaying the timing of outputting the beat signal from the timing of the rising edge of the Vsync signal for a certain time, and starting the beat by 1ms of the rising edge of the Vsync signal as shown in curve 3 in fig. 3, the noise gradually decreases as the beat time increases, which coincides with the theoretical trend shown in curve 1.
As can be seen from the curves 1 to 3, when the touch detection is triggered at the time of the rising edge of the Vsync signal, the distribution of the noise along with time does not conform to the theoretical trend, as shown in the curve 2, when the coding time is changed 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; 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 is basically consistent with the theoretical trend. It can be seen that there is also a temporal correlation between the noise of the touch detection and the Vsync signal.
Normally, the display layer uses Vsync signal as a trigger to refresh a frame of display image; 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 screen. 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 analog display technology represented by old CRT displays. Due to historical compatibility issues, LCD display technology and OLED display technology inherit control logic in partial Cathode Ray Tube (CRT) display technology, resulting in a number of pulses of Hsync signals between every two Vsync signals greater than the line resolution of the display screen.
As shown in fig. 4, the timing relationship between the Vsync signal, the Hsync signal, and the display noise sequentially includes, in a field scanning period of the Vsync signal, for example, between rising edges of two adjacent Vsync signals in fig. 4, that is, the first Vsync signal and the second Vsync signal, in chronological order: a pulse width of the first Vsync signal, a Vertical Back Porch (VBP) of the first Vsync signal, an active signal interval, and a Vertical Front Porch (VFP) of the first Vsync signal. Hereinafter, the vertical rear shoulder is simply referred to as a rear shoulder, and the vertical front shoulder is simply referred to as a front shoulder.
The effective signal interval is a time interval for updating pixel data of the display layer, and in the effective signal interval, the display layer updates the pixel data, so that the data signal is input into the pixel circuit of the display layer, and then the display layer noise is introduced into the touch layer. And in the time of the front shoulder and the back shoulder, the display layer does not update the pixel data, so that display layer noise is not introduced into the touch layer.
In the 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 a first time interval. That is, the first time interval is a time interval other than the effective signal interval in each field scanning period.
The pulse width of the field sync signal is the time occupied by the pulse of the field sync signal.
Taking fig. 5 as an example, a first time interval corresponding to a certain model of mobile phone is shown. The pulse width of a field synchronizing signal of a display layer of a screen of the mobile phone is equal to one line scanning period of a line synchronizing signal, the back shoulder of the field synchronizing signal comprises 16 line scanning periods, and the front shoulder of the field synchronizing signal comprises 7 line scanning periods. Thus, the first time interval shown in fig. 5 includes 24 line scan periods. Wherein each line period is about 5.6us and the first time interval is 134 us.
The embodiment of the application utilizes the first time interval to perform touch detection so as to avoid mutual interference between the touch layer and the display layer. This is described in detail below with reference to fig. 6 to 8.
Fig. 6 shows a touch chip 600 according to an embodiment of the present application. The touch chip 600 is used for performing touch detection in a first time interval.
Optionally, the touch chip 600 includes a driving circuit 610 for outputting a touch code signal to a touch layer of a screen in a first time interval.
Optionally, the touch chip 600 includes a detection circuit 620 for receiving a detection signal output by the touch layer during a first time interval.
It should be understood that, during the touch detection, the outputting of the code signal by the driving circuit 610 and the receiving of the corresponding detection signal by the detection circuit 620 are both performed in the first time interval. Generally, the detection circuit 620 receives a detection signal output from the touch layer while the driving circuit 610 outputs a code signal. The detection signal carries touch information of a user, such as a capacitance variation of the touch electrode caused by the touch of the user. After the detection signal is subjected to subsequent processing, the touch information of the user can be obtained.
Wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen includes: the pulse width of the field sync signal in the field period, the back shoulder of the field sync signal, the effective signal interval in the field period, and the front shoulder of the field sync signal.
The valid signal interval is a time interval for updating the pixel data of the display layer in the field scanning period, and as shown in fig. 4, in one field scanning period, the first time interval sequentially includes the pulse width of the first field sync signal, the back shoulder of the first field sync signal, and the front shoulder of the first field sync signal according to time.
The display layer comprises a field synchronizing signal, a field synchronizing signal pulse width, a field synchronizing signal back shoulder, an effective signal interval and a field synchronizing signal front shoulder, wherein the field synchronizing signal pulse width, the field synchronizing signal back shoulder, the effective signal interval and the field synchronizing signal front shoulder are included in one field scanning period of the field synchronizing signal of the display layer.
The pulse width of the field sync signal in the field period, the back shoulder of the field sync signal, the effective signal interval in the field period, and the front shoulder of the field sync signal each include an integer number of line periods, as shown in fig. 4 and 5.
The number of line scanning periods included in the field scanning period is larger than the line resolution of the display screen of the display layer, and the number of line scanning periods included in the effective signal section is generally 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 effective signal interval may also be larger than the line resolution of the display screen, for example, for an electronic device supporting a resolution of 2960 × 1440, the resolution of the display screen may be set to 1480 × 720, and after the resolution of the display screen is reduced, the relative position of the effective signal interval remains unchanged, except that one line of pixel data is presented every two lines of pixels.
For example, as shown in fig. 7, taking a first time interval formed by a leading shoulder of the first field sync signal, a pulse width of the second field sync signal, and a trailing shoulder of the second field sync signal as an example, the touch chip 600 may perform touch detection such as self-capacitance detection, mutual capacitance detection, or sending an uplink signal to the active pen during the first time interval. It should be understood that in the embodiment of the present application, operations such as fingerprint detection, for example, capacitive fingerprint detection or optical fingerprint detection, may also be performed in the first time interval.
The time when the touch chip 600 outputs the corresponding code signal to the touch layer may be triggered by a certain line sync signal in the first time interval shown in fig. 7, or may be triggered by a line sync signal in the first time interval, or the time when the code signal starts to be output in the first time interval may be triggered by a line sync signal in the first time interval, and the code printing is finished before the end time of the back shoulder of the second field sync signal. Therefore, the pixel data is not updated in the display layer in the first time interval, and no data signal is input, so that the touch detection can be ensured not to be influenced by noise from the display layer; meanwhile, the coding signal of the touch layer does not influence the updating of the pixel data of the display layer.
When the time for touch detection or fingerprint detection exceeds the length of the first time interval, that is, the first time interval is not enough for transmitting the code signal output in the current touch detection, in one possible implementation, the driving circuit 610 may output the code signal to the touch layer in at least one previous line scanning period adjacent to the first time interval; and/or outputting a coding signal to the touch layer in at least one subsequent line scanning period adjacent to the first time interval.
It should be understood that the at least one line period extending forward or backward is a part or all of the line period within the valid signal interval.
For example, as shown in fig. 8, when the first time interval shown in fig. 8 is not enough for transmitting the coding signal for touch detection, the time for outputting the coding signal may be extended forward based on the start time of the front shoulder of the first field sync signal; or extending backward based on the end time of the back shoulder of the second field sync signal; or extends forward for a period of time based on the start time of the front shoulder of the first field sync signal and extends backward for a period of time based on the end time of the back shoulder of the second field sync signal. Therefore, the continuous output of the code printing signal of the current touch detection is ensured. It should be understood that fig. 7 and 8 only show the first time interval consisting of the leading shoulder of the first field sync signal, the pulse width of the second field sync signal, and the trailing shoulder of the second field sync signal.
Therefore, in the first time interval, the touch layer and the display layer cannot be influenced mutually. However, during at least one line scan period extending forward or backward based on the first time interval, an interaction between the display layer and the touch layer may occur.
To this end, in one implementation, the detection circuit 620 may receive the detection signal output by the touch layer at a second time interval within the previous at least one line scanning period; and/or receiving a detection signal output by the touch layer in a second time interval in the at least one subsequent line scanning period. Thereby eliminating to some extent the interaction between the display layer and the touch layer during the extended time.
In the extended at least one line scanning period before and/or at least one line scanning period after, each line scanning period may include a second time interval, where the second time interval is a time interval in the line scanning period except a time interval for updating pixel data of the display layer. For example, the second time interval may be a period T2 shown in fig. 2, and the detection circuit 620 may acquire the detection signal within the period T2.
Of course, the detection circuit 620 may also acquire the detection signal from the touch layer during the period T2 in each row scanning period of the first time interval and during the period T2 in each row scanning period extending based on the first time interval.
The first time interval may be referred to as an absolute low noise interval, and the second time interval may be referred to as a relative low noise interval.
In the embodiment of the application, the time for touch detection or fingerprint detection is set in the first time interval of the field scanning period of the display layer, and the pixel data of the display layer is not refreshed in the first time interval, so the touch detection or fingerprint detection is not affected by the signal transmission of the display layer, and the display layer is not affected by the coding signal of the touch layer when the pixel data is updated in the effective signal interval.
The table one shows a touch detection result obtained when the coding scheme of the embodiment of the application is adopted. Assuming that the touch detection time is 150us, the code signal of the touch detection is used for self-capacitance detection. As shown in table one, when touch detection is performed in an effective Signal interval in a field scanning period of a display layer, Signal to Noise ratios (SNRs) of detection signals in low-Noise, medium-Noise and high-Noise scenes are 4.76, 3.30 and 0.08, respectively; when touch detection is performed in the first time interval, SNRs in low-noise, medium-noise and high-noise scenes are 6.67, 6.67 and 6.25, respectively. Therefore, by adopting the touch coding scheme of the embodiment of the application, the performance of touch detection can be improved by 1.4, 2.2 and 78.1 times in low-noise, medium-noise and high-noise scenes respectively.
As can be seen from table one, the influence of the display layer noise on the touch detection can be well eliminated by performing the touch detection in the first time interval, and the signal-to-noise ratio of the touch detection result is improved, wherein for the case of high noise of the display layer, when the touch coding scheme of the embodiment of the application is adopted, the performance of the detection result is improved more obviously; moreover, when touch detection is performed in the first time interval, the display layer does not update the pixel data, so that the coding signal in the touch detection process does not influence the display image of the display layer, and the display layer does not show a water ripple phenomenon.
The application also provides a coding method. As shown in fig. 9, the method 900 can be performed by the touch 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, in the first time interval, a code signal is output to a touch layer of a screen.
Wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal.
The effective signal interval is a time interval used for updating pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
The display layer only updates the pixel data in the effective signal interval, so that the pulse width of the field synchronizing signal, the back shoulder of the field synchronizing signal and the front shoulder of the field synchronizing signal are taken as a first time interval, and a coding signal is output to the touch layer in the first time interval, so that the touch detection of the touch layer cannot be influenced when the pixel updating is carried out on the display layer, and meanwhile, the coding signal of the touch layer cannot influence the updating of the pixel data of the display layer.
Optionally, in an implementation manner, the field 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 coding signal, the method further includes: outputting the coding signal to the touch layer in at least one previous line scanning period adjacent to the first time interval; and/or outputting the coding signal to the touch layer in at least one subsequent line scanning period adjacent to the first time interval.
Optionally, in an implementation manner, the method further includes: receiving a detection signal from the touch layer in the first time interval
Optionally, in an implementation manner, the pulse width of the field sync signal, the back shoulder of the field sync signal, the valid signal interval, and the front shoulder of the field sync signal all include an integer number of line scanning periods of the line sync 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 a line resolution of a display screen of the display layer.
It should be understood that the detailed description of the method 900 can refer to the related description of the touch chip 600 in fig. 6 to fig. 8, and for brevity, the detailed description is omitted here.
The application also provides a fingerprint chip for: and in a first time interval, carrying out fingerprint detection on the finger above the screen.
Wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal.
The effective signal interval is a time interval used for updating pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
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: and outputting a code printing signal for fingerprint detection in the first time interval.
For example, as shown in the last row of fig. 7, as an illustration, fig. 7 only shows one pulse of the code signal, and when actually performing fingerprint detection, the driving circuit outputs a continuous code signal, but the code length is usually smaller than the code length in touch detection.
Optionally, in an implementation manner, the fingerprint chip is an optical fingerprint chip, and the fingerprint chip includes a light path guide structure and a fingerprint sensor located below the light path guide structure. The light 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 in the first time interval.
It should be understood that, for the specific description of the first time interval during the fingerprint detection, reference may be made to the related description of the touch chip 600 in fig. 6 to fig. 8, and for brevity, the description is not repeated here.
An embodiment of the present application further provides an electronic device, including: a screen; and, the touch chip in the various embodiments of the present application described above.
By way of example and not 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, an in-vehicle electronic device, or a wearable smart device, and other electronic devices such as an electronic database, an automobile, and an Automated Teller Machine (ATM). This wearable smart machine includes that the function is complete, the size is big, can not rely on the smart mobile phone to realize complete or partial function, for example: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and other devices.
It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.
It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A touch chip, comprising a driving circuit, wherein the driving circuit is configured to:
outputting a coding signal to a touch layer of a screen in a first time interval and at least one previous line scanning period adjacent to the first time interval; and/or the presence of a gas in the gas,
outputting a coding signal to a touch layer of a screen in a first time interval and at least one subsequent line scanning period adjacent to the first time interval;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal, the field scanning period including a plurality of line scanning periods of the line sync signal of the display layer;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
2. The touch chip of claim 1, further comprising a detection circuit, the detection circuit configured to:
and receiving a detection signal from the touch layer within the first time interval.
3. The touch chip of claim 1 or 2, wherein the pulse width of the field sync signal, the back shoulder of the field sync signal, the effective signal interval, and the front shoulder of the field sync signal each include an integer number of line scan periods of the line sync signal of the display layer.
4. The touch chip of claim 3, wherein the number of the line scan cycles included in the valid signal interval is equal to a line resolution of a display frame of the display layer.
5. A coding method is characterized by comprising the following steps:
acquiring a first time interval;
outputting a coding signal to a touch layer of a screen in the first time interval and at least one previous line scanning period adjacent to the first time interval; and/or the presence of a gas in the gas,
outputting a coding signal to a touch layer of a screen in the first time interval and at least one subsequent line scanning period adjacent to the first time interval;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal, the field scanning period including a plurality of line scanning periods of the line sync signal of the display layer;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
6. The method of claim 5, further comprising:
and receiving a detection signal from the touch layer within the first time interval.
7. The method according to claim 5 or 6, wherein the pulse width of the field sync signal, the back shoulder of the field sync signal, the active signal section, and the front shoulder of the field sync signal each comprise an integer number of line scanning periods of the line sync signal of the display layer.
8. The method according to claim 7, wherein the number of the line scanning periods included in the effective signal interval is equal to a line resolution of a display screen of the display layer.
9. A fingerprint chip, configured to:
fingerprint detection is carried out on a finger above a screen in a first time interval and at least one line scanning period before the first time interval; and/or the presence of a gas in the gas,
fingerprint detection is carried out on a finger above a screen in a first time interval and at least one line scanning period after the first time interval is adjacent;
wherein, the one field scanning period of the field synchronizing signal of the display layer of the screen comprises: a pulse width of the field sync signal within the field scanning period, a back shoulder of the field sync signal, an effective signal interval within the field scanning period, and a front shoulder of the field sync signal, the field scanning period including a plurality of line scanning periods of the line sync signal of the display layer;
the effective signal interval is a time interval used for updating the pixel data of the display layer in the field scanning period, and the first time interval includes a pulse width of the field synchronizing signal, a back shoulder of the field synchronizing signal, and a front shoulder of the field synchronizing signal.
10. The fingerprint chip of claim 9, wherein the fingerprint chip is a capacitive fingerprint chip, the fingerprint chip comprising a driving circuit configured to:
and outputting a code printing signal for fingerprint detection in the first time interval.
11. The fingerprint chip of claim 9, wherein the fingerprint chip is an optical fingerprint chip, the fingerprint chip comprises an optical path guiding structure and a fingerprint sensor located below the optical path guiding structure,
the light 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 in the first time interval.
12. An electronic device, comprising:
a screen; and the number of the first and second groups,
the touch chip of any of the above claims 1 to 4 and/or the fingerprint chip of any of the above claims 9 to 11.
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| CN202010988172.XA CN111930268B (en) | 2020-09-18 | 2020-09-18 | Touch control chip, code printing method and electronic equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090119727A (en) * | 2008-05-16 | 2009-11-19 | 세이코 엡슨 가부시키가이샤 | Electro-optical device, electronic apparatus, and contact detection method |
| US9886153B2 (en) * | 2015-06-03 | 2018-02-06 | Forcaltech Systems Co., Ltd. | Touch sensing method and system for avoiding display noises |
| CN107885368A (en) * | 2016-09-30 | 2018-04-06 | 深圳深微创芯科技有限公司 | Touch display unit and electronic equipment |
| CN109144335A (en) * | 2018-08-29 | 2019-01-04 | 基合半导体（宁波）有限公司 | A kind of touch screen, detection method and mobile terminal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101394937B1 (en) * | 2010-09-07 | 2014-05-15 | 엘지디스플레이 주식회사 | Display device having touch sensor and method for driving the same |
| CN109521903A (en) * | 2017-09-19 | 2019-03-26 | 奕力科技股份有限公司 | Touch display device and touch and display scanning method thereof |
-
2020
- 2020-09-18 CN CN202010988172.XA patent/CN111930268B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090119727A (en) * | 2008-05-16 | 2009-11-19 | 세이코 엡슨 가부시키가이샤 | Electro-optical device, electronic apparatus, and contact detection method |
| US9886153B2 (en) * | 2015-06-03 | 2018-02-06 | Forcaltech Systems Co., Ltd. | Touch sensing method and system for avoiding display noises |
| CN107885368A (en) * | 2016-09-30 | 2018-04-06 | 深圳深微创芯科技有限公司 | Touch display unit and electronic equipment |
| CN109144335A (en) * | 2018-08-29 | 2019-01-04 | 基合半导体（宁波）有限公司 | A kind of touch screen, detection method and mobile terminal |
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