CN110959150B - Signal transmitting and receiving method, processor chip, active pen and touch screen - Google Patents
Signal transmitting and receiving method, processor chip, active pen and touch screen Download PDFInfo
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- CN110959150B CN110959150B CN201980002130.XA CN201980002130A CN110959150B CN 110959150 B CN110959150 B CN 110959150B CN 201980002130 A CN201980002130 A CN 201980002130A CN 110959150 B CN110959150 B CN 110959150B
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000007639 printing Methods 0.000 claims description 26
- 230000006870 function Effects 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 claims 10
- 238000012512 characterization method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 14
- 238000004891 communication Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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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
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- General Engineering & Computer Science (AREA)
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- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- User Interface Of Digital Computer (AREA)
Abstract
Some embodiments of the application provide a signal transmitting and receiving method, a processor chip, an active pen and a touch screen. The signal transmitting method comprises the following steps: obtaining characterization pressure information and a code for pen point position detection according to the detected pressure information, wherein the code comprises n code bits, and n is an integer (101) larger than 1; generating n coding signals (102) corresponding to the n coding bits; transmitting each of the n code signals at a preset first frequency or a preset second frequency; wherein the first frequency and the second frequency of the n encoded signals are related to pressure information (103). By adopting the scheme, the active pen can output more coordinates of the pen point position in unit time, and the touch screen can detect more coordinates of the pen point position in unit time, so that the point reporting rate is improved.
Description
Technical Field
The present application relates to the field of signal processing technologies, and in particular, to a signal transmitting and receiving method, a processor chip, an active pen, and a touch screen.
Background
With the popularity of capacitive touch screens, capacitive active pens are becoming more and more widely used. When a user uses the capacitive active pen, the capacitive touch screen detects screen body code printing signals and active pen code printing signals in a time-sharing mode; the screen detection time of the capacitive touch screen is a key factor influencing the point reporting rate of the active pen, and the higher the point reporting rate is, the faster the screen reacts to the writing of the active pen. Along with the improvement of the requirements of the user on the writing experience and the touch experience of the active pen, the requirements on the point reporting rate of the active pen are higher and higher.
The inventors found that the prior art has at least the following problems: in the existing coding mode, the coordinate coding and pressure coding time is longer, the point reporting rate is lower, and the touch experience of a user is affected.
Disclosure of Invention
The application provides a signal transmitting and receiving method, a processor chip, an active pen and a touch screen, wherein the active pen can output more coordinates of the pen point position in unit time, and the touch screen can detect more coordinates of the pen point position in unit time, so that the point reporting rate is improved.
The embodiment of the application provides a signal transmitting method which is applied to an active pen and comprises the following steps: according to the detected pressure information, obtaining characterization pressure information and codes for detecting the position of the pen point, wherein the codes comprise n code bits, and n is an integer greater than 1; generating n coding signals corresponding to the n coding bits; transmitting each of the n code signals at a preset first frequency or a preset second frequency; wherein the first frequency and the second frequency of the n encoded signals are related to pressure information.
The embodiment of the application also provides a signal receiving method which is applied to the touch screen and comprises the following steps: sequentially detecting n code printing signals transmitted by the active pen, wherein the n code printing signals respectively have preset first frequency or preset second frequency; acquiring pressure information according to the frequency of a signal representing the pressure information in the detected n coding signals; and obtaining coordinates of the pen point position according to the detected amplitude information of the signals used for detecting the pen point position in the n code printing signals.
The embodiment of the application also provides a processor chip for executing the signal transmitting method.
The embodiment of the application also provides an active pen which comprises the processor chip.
The embodiment of the application also provides a touch screen, which comprises: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the signal receiving method described above.
According to the embodiment of the application, for the prior art, after the representation pressure information and the codes for detecting the pen point position are obtained according to the detected pressure information, code printing signals corresponding to all code bits in the codes are generated, so that n code printing signals are obtained, and then the n code printing signals are transmitted by adopting different transmitting modes according to different codes; for binary coding, each of n coded bits of the binary coding has two coding values, each coded signal of the n coded signals is transmitted at a preset first frequency or a preset second frequency, namely, the coded signals corresponding to the coded bits with the coding values of 0 and 1 are respectively transmitted by adopting the first frequency and the second frequency, so that when the coded signals are detected by the touch screen, the coded values of all the coded bits can be identified according to the frequency of the detected signals, thereby realizing the transmission of pressure information, and meanwhile, the coded bits representing the pressure information can be used for detecting the pen point positions, so that the coordinates of the pen point positions are not required to be transmitted, the touch screen can acquire the coordinates of the pen point positions while detecting the pressure information, the detection time of the touch screen is reduced, the coordinates of more pen point positions can be output by the active pen in unit time, the coordinates of more pen point positions can be detected by the touch screen in unit time, and the point reporting rate is improved; for ternary coding, three coding values exist in each of n coding bits of ternary coding, each coding signal representing pressure information in the n coding signals is transmitted in a preset first frequency, a preset second frequency or a mode of prohibiting transmission, namely, when the pressure information is transmitted, a higher pressure level can be realized by using fewer coding bits, so that the time for transmitting the pressure information is reduced, the active pen can output more coordinates of the pen point position in unit time, and the point reporting rate is improved.
For example, n code bits are used as n pressure code bits representing the pressure information, and any two of the n pressure code bits are used as coordinate codes for pen tip position detection. The embodiment provides a specific arrangement mode of the pressure coding bit and the coordinate coding.
For example, deriving a code characterizing pressure information and for pen tip position detection from the detected pressure information, comprising: and obtaining the characterization pressure information, the pressing signal and the code for detecting the position of the pen point according to the detected pressure information and the pressing signal of the functional key. The code in this embodiment can also be used to transmit a pressing signal of a function key.
For example, any one of the n code bits serves as a key code bit that characterizes the press signal. The embodiment provides a specific setting mode of key coding bits.
For example, the active pen includes two function keys, and the pressing signals of the two function keys respectively correspond to key code bits of different code values. In this embodiment, the pressing signals of two function keys can be transmitted through one key code bit.
For example, before deriving the characterizing pressure information and the code for pen tip position detection from the detected pressure information, it further comprises: and responding to the synchronous signal sent by the touch screen, starting timing after the synchronous signal is ended, and entering a step of obtaining the characterization pressure information and the code for detecting the pen point position according to the detected pressure information when the timing duration reaches the preset delay time. The embodiment provides a specific implementation mode for synchronizing the active pen with the touch screen.
For example, the first frequency and the second frequency correspond to pressure encoded bits of different encoded values, respectively.
For example, the first frequency corresponds to a pressure encoded bit having a code value of "0" and the second frequency corresponds to a pressure encoded bit having a code value of "1".
For example, two pressure coded bits corresponding to the coordinate code are adjacent among n pressure coded bits. In this embodiment, two pressure coding bits corresponding to the coordinate codes are set to be adjacent to each other in the n pressure coding bits, so that the touch screen can detect the pen point position conveniently.
For example, if n is an odd number, the number of coordinate encodings is (n-1)/2; if n is an even number, the number of coordinate encodings is n/2. The embodiment provides a mode of maximally transmitting the coordinates of the pen point position, so that the point reporting rate is improved as much as possible.
For example, the code is binary code.
For example, according to the frequency of the signal characterizing the pressure information in the detected n coded signals, acquiring the pressure information includes: for each signal representing pressure information, according to the frequency of the signal, the code value of the code bit of the signal corresponding to the pressure information is obtained. The embodiment provides a specific implementation manner for acquiring the pressure information according to the frequency of the signal representing the pressure information in the detected n code signals.
For example, the touch screen includes a driving channel and an induction channel, and sequentially detects n coding signals emitted by the active pen, including: and detecting n coding signals sequentially through the driving channel and the sensing channel. The embodiment provides a specific implementation manner for sequentially detecting n coding signals emitted by the active pen by the touch screen.
For example, the drive channel includes a plurality of drive electrodes, and the sense channel includes a plurality of sense electrodes; the amplitude information comprises the amplitude of the signals detected by the driving electrodes and the amplitude of the signals detected by the sensing electrodes; according to the detected amplitude information of the signals used for detecting the pen point position in the n code printing signals, obtaining coordinates of the pen point position, wherein the coordinates comprise: comparing the amplitude of the signal with a threshold value, if the amplitude of the signal is smaller than the threshold value, judging that the active pen does not emit the code printing signal, or if the amplitude of the signal is larger than the threshold value, judging that the active pen emits the code printing signal; and selecting a driving electrode corresponding to the signal with the largest amplitude and an induction electrode corresponding to the signal with the largest amplitude for the signal used for detecting the position of the pen point, and calculating the coordinate of the position of the pen point. The embodiment provides a specific way to obtain the coordinates of the pen point position according to the amplitude information of the detected n code signals for pen point position detection.
For example, according to the detected amplitude information of the signal for detecting the pen tip position in the n code signals, the coordinates of the pen tip position are obtained, including: comparing the amplitude information of the signal of the first frequency with the amplitude information of the signal of the second frequency for each signal for detecting the position of the pen point, and if the amplitude information of the signal of the first frequency is larger than the amplitude information of the signal of the second frequency, calculating the coordinate of the position of the pen point according to the amplitude information of the signal of the first frequency; if the amplitude information of the signal of the first frequency is smaller than that of the signal of the second frequency, calculating coordinates of the pen point position according to the amplitude information of the signal of the second frequency. In this embodiment, the coordinates of the pen tip position can be calculated from the signal with the frequency having the larger amplitude information, and the noise contained in the signal is smaller, so that the coordinates of the pen tip position can be obtained more accurately.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic diagram of an active pen in communication with a touch screen in a first embodiment in accordance with a first embodiment of the application;
fig. 2 is a specific flowchart of a signal transmitting method in the first embodiment according to the present application;
FIG. 3 is a schematic diagram of a binary code comprising 12 code bits transmitting 3-time coordinate codes in accordance with a first embodiment of the present application;
FIG. 4 is a schematic diagram of a binary code comprising 12 code bits transmitted 4 times a coordinate code in accordance with a first embodiment of the present application;
FIG. 5 is a schematic diagram of a binary code comprising 7 code bits transmitting 3-time coordinate codes in accordance with a first embodiment of the present application;
FIG. 6 is a schematic diagram of a binary code comprising 8 code bits transmitted 4-time coordinate coding in accordance with a first embodiment of the present application;
FIG. 7 is a schematic diagram of a ternary encoded transmission 2-time coordinate encoding comprising 12 encoded bits in a first embodiment according to the present application;
fig. 8 is a schematic diagram showing the transmission of a coded signal corresponding to binary code 101010 according to the first embodiment of the present application;
fig. 9 is a schematic diagram showing the transmission of a coded signal corresponding to ternary code 20102010 in the first embodiment of the present application;
fig. 10 is a specific flowchart of a signal transmitting method in a second embodiment according to the present application;
FIG. 11 is a schematic diagram of an active pen in synchronization with a touch screen signal in a second embodiment according to the application;
fig. 12 is a schematic diagram of a synchronization signal of 1001 pulse train in a second embodiment according to the present application;
fig. 13 is a specific flowchart of a signal transmitting method in a third embodiment according to the present application;
FIG. 14 is a diagram of binary codes including key code bits and check code bits according to a third embodiment of the present application;
FIG. 15 is a schematic diagram of ternary encoding according to a third embodiment of the present application including key encoding bits and check encoding bits;
fig. 16 is a specific flowchart of a signal receiving method in a fourth embodiment according to the present application;
fig. 17 is a schematic diagram of detecting 6 coded signals using 6 detection time slices in a fourth embodiment according to the present application;
FIG. 18 is a schematic diagram of a touch screen alternately detecting 6 coded signals through a driving channel and a sensing channel according to a fourth embodiment of the present application;
FIG. 19 is a diagram of active pen signal emitting binary encoding and screen end detection in accordance with a third embodiment of the present application;
FIG. 20 is a schematic diagram of active pen signal emission ternary encoding and screen end detection in accordance with a third embodiment of the present application;
Fig. 21 is a specific flowchart of a signal receiving method according to a third embodiment of the present application, in which step 403 is refined.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the objects, technical solutions and advantages of the present application more apparent, some embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The first embodiment of the present application relates to a signal transmitting method applied to an active pen, where the active pen is used for communication with a touch screen, and fig. 1 is a schematic diagram of communication between the active pen and the touch screen. The active pen may be a capacitive active pen.
The communication mode between the active pen and the touch screen is described below.
The touch screen includes a sensing layer 11, a touch controller 12, and a multiplexer 13, wherein the sensing layer 11 includes a driving channel Y and a sensing channel X, and the driving channel Y and the sensing channel X are connected to the touch controller 12 through the multiplexer 13, and the touch controller 12 further includes a sensing circuit 121 and a driving circuit 122. In the touch screen end detection timing sequence, in a period T, the touch screen 200 sequentially completes the following operations: signal synchronization and active pen signal detection; the number of times of the period T executed by the screen end in unit time is the point reporting rate of the screen end.
In this stage of active pen signal detection, the touch controller 12 controls the driving channel Y and the sensing channel X to be connected to the sensing circuit 121 through the multiplexer 13, and when the pen tip of the active pen 100 sends a signal to the touch screen, coupling capacitances exist between the active pen 100 and the driving channel Y and the sensing channel X, the signal is coupled to the driving channel Y and the sensing channel X through the coupling capacitances, and then the sensing circuit 121 detects the signal, and in the detection process, the touch screen only receives the signal and does not send the driving signal.
The specific flow of the signal transmitting method of this embodiment is shown in fig. 2.
And step 101, according to the detected pressure information, obtaining the characterization pressure information and the code for detecting the pen point position, wherein the code comprises n code bits.
Specifically, when the active pen 100 contacts with the touch screen 20, the active pen 100 can measure the pressure information of the pen tip at each moment through the components like a pressure sensor and the like in the active pen 100, then the measured pressure information of the pen tip is coded by adopting a preset coding mode to obtain a pressure code, and then a coordinate code for detecting the position of the pen tip is added into the pressure code, so that the code for representing the pressure information and the code for detecting the position of the pen tip can be obtained, wherein the code comprises n coding bits, and n is an integer greater than 1; the pressure coding and the coordinate coding adopt the same coding mode for coding.
In this embodiment, the codes may be binary codes or ternary codes, which are mainly related to the preset coding mode in the active pen 100, and are described in detail below in connection with specific coding modes.
When the coding mode is a binary coding mode, the active pen 100 firstly performs binary conversion on the measured pressure information to obtain binary codes comprising n coding bits, wherein the n coding bits are also pressure coding bits for representing the pressure information; for the coordinate code for detecting the position of the pen point, each coordinate code corresponds to the coordinate of one pen point position, any two pressure code bits of n pressure code bits can be used as the coordinate code, each coordinate code comprises two coordinate code bits, namely, the two pressure code bits are multiplexed into the coordinate code bits, only a corresponding decoding mode is set at the screen end, and the screen end decodes one coordinate according to one coordinate code; after the pressure coding bits corresponding to all the coordinate codes are set, the obtained binary codes comprising n coding bits are the binary codes for representing the pressure information and detecting the pen point position. In the case where any two of the n pressure coded bits are used as the coordinate code, for example, the pressure coded bit 1 and the pressure coded bit 3 are set as one coordinate code in order among the n pressure coded bits. Preferably, two pressure coding bits corresponding to the coordinate coding may be set to two adjacent pressure coding bits in the n pressure coding bits, so that the touch screen 200 performs coordinate detection, and meanwhile, since there is no interval coding bit between the two pressure coding bits corresponding to the coordinate coding, accuracy of the detected coordinates is improved. For example, the active pen 100 outputs a binary code including 12 code bits, referring to fig. 3, the binary code is set to 6 coordinate code bits, 3 coordinate codes for pen tip position detection can be transmitted, and the touch screen can calculate 3 coordinates according to the 3 coordinate codes. Referring to fig. 4, the binary code is set to 8 coordinate code bits, 4 coordinate codes for pen tip position detection can be transmitted, and the touch screen can calculate 4 coordinates according to the 4 coordinate codes. The coordinate code is only a code signal output by the active pen, the active pen does not calculate the coordinate, the active pen outputs a voltage signal with a fixed size to the touch screen through a coupling capacitance between the active pen and the touch screen, and the touch screen calculates the coordinate of the active pen according to the coordinate code of the active pen.
In this embodiment, if n is an odd number, the number of coordinate codes that can be set up at maximum in the obtained binary codes is (n-1)/2, please refer to fig. 5, taking n=7 as an example, the binary codes can be set up with 3 coordinate codes at maximum; if n is an even number, the number of the largest settable coordinate codes in the obtained binary codes is n/2, please refer to fig. 6, taking n=8 as an example, the binary codes can be set with 4 coordinate codes at most; in fig. 5 and 6, two adjacent pressure coding bits corresponding to the same coordinate code are taken as examples.
When the coding mode is a ternary coding mode, the active pen 100 firstly performs ternary conversion on the measured pressure information to obtain ternary coding comprising k coding bits, wherein the k coding bits are also pressure coding bits for representing the pressure information; for the coordinate codes for nib position detection, each coordinate code corresponds to the coordinate of one nib position, and at this time, the coordinate code is inserted into a ternary code including k system code bits, each coordinate code includes two coordinate code bits, so that the sum of k and the number of 2 times of the coordinate codes is equal to n, that is, a ternary code including n code bits can be obtained, that is, a part of n code bits is used as the pressure code bit representing the pressure information, and the other part is used as the coordinate code for nib position detection; where k is an integer greater than 0. Referring to fig. 7, n=12, the number of pressure encoded bits is 8, and the number of coordinate encodings is 2. In fig. 7, two coordinate coded bits corresponding to the same coordinate code are adjacent to each other in the ternary code.
When the touch screen 200 detects coordinates, two coordinate code bits in one coordinate code are detected by using the driving channel Y and the sensing channel X, respectively, so as to obtain coordinates of the pen point position.
It should be further noted that, the size of n may be set according to the pressure level that the active pen 100 needs to reach, in the binary encoding manner, each encoded bit has two states, that is, the encoded value of the encoded bit may be 0 or 1, n encoded bits in the binary encoding indicate the pressure information, the first frequency F1 and the second frequency F2 respectively correspond to the encoded value of each encoded bit of the pressure information, for example, the first frequency corresponds to the encoded bit of the pressure having the encoded value of "0", and the second frequency corresponds to the encoded bit of the pressure having the encoded value of "1"; the pressure level that the active pen 100 can achieve at this time can be represented as 2 n When the active pen 100 needs to reach a 64 pressure level, n=6 is set; when the active pen 100 needs to reach 256 pressure levels, n=8 is set; when the active pen 100 needs to reach a 4096 pressure level, n=12 is set. In a ternary coding scheme, there are three states for each coded bit, i.e. the coded value of the coded bit may be 0, 1 or 2, and k coded bits in ternary coding are used for transmitting pressure information, the first frequency, the second frequency and the transmission of pressure coded bits corresponding to different coded values respectively are prohibited. For example, the transmission of a pressure code bit having a ternary code value of "0" corresponding to the pressure information is prohibited, the first frequency corresponds to a pressure code bit having a ternary code value of "1" corresponding to the pressure information, and the second frequency corresponds to a pressure code bit having a ternary code value of "2" corresponding to the pressure information; the pressure level that the active pen 100 can achieve at this time can be represented as 3 k When the active pen 100 needs to reach the 81 pressure level, k=4 is set; when the active pen 100 needs to reach the 243 pressure level, k=5 is set; when active pen 100 needs to reach 5651 pressure rating, k=8 is set.
Step 102, generating n coding signals corresponding to the n coding bits.
Specifically, the code signal sent by the pen tip of the active pen 100 may be a square wave, a sine wave, or a triangular wave, and the code signal corresponding to each code bit is set according to the preset code signal type, so that the code signal corresponding to each code bit in the code can be obtained, that is, n code signals corresponding to the code can be obtained, which are sequentially arranged.
Step 103, the n code signals are sequentially transmitted.
Specifically, two emission frequencies, a first frequency f1 and a second frequency f2, are preset inside the active pen 100; if the code is binary code, each of the n code signals is transmitted at a preset first frequency or a preset second frequency, and the first frequency and the second frequency of the n code signals are related to the pressure information, please refer to fig. 3 to 6. Specifically, for binary coding, the code value of each code bit is 1 or 0, the first frequency f1 may be preset to correspond to the code value 1, the second frequency f2 may correspond to the code value 0, taking fig. 8 as an example, the binary coding representing the pressure information is 101010, the decimal value corresponding to the binary coding 101010 is the pressure, and in the signal transmitting stage, the frequencies of the coding signals corresponding to the code bits transmitted by the active pen 100 are f1, f2, f1, f2 in sequence.
If the codes are ternary codes, for the code bits representing the pressure information, transmitting each code signal representing the pressure information in the n code signals in a preset first frequency, a preset second frequency or a mode of prohibiting transmission, wherein the first frequency, the second frequency and the prohibition transmission of the code signal representing the pressure information in the n code signals are related to the pressure information; in addition, each of the n code signals for pen tip position detection is transmitted in a first frequency or a second frequency. Specifically, for ternary coding, the coding value of each coding bit is 2, 1 or 0, it may be preset that no coding signal is transmitted (which may be implemented by controlling the coding signal to be at a low level) and corresponds to the coding value 0, the first frequency f1 corresponds to the coding value 1, the second frequency f2 corresponds to the coding value 2, taking fig. 9 as an example, the ternary coding includes two coordinate codes, two coordinate coding bits corresponding to each coordinate code are adjacent, and each coordinate code includes 4 pressure coding bits for representing pressure information at the rear of each coordinate code, so that the pressure coding bits representing the pressure information are 20102010 respectively, the coding value corresponding to decimal of the pressure coding 20102010 is the pressure size, and in the signal transmitting stage, the frequency of the coding signal corresponding to the coordinate coding bit outputting each coordinate code is the first frequency f1 or the second frequency f2 (taking f1 as an example in the figure), and the mode of outputting the pressure coding bits sequentially includes: f2, no signal, f1, no signal, f2, no signal, f1, no signal. It should be noted that the foregoing is merely an example, and the code signal may not be transmitted and may correspond to the code value 1 or 2, which is not limited in any way.
Compared with the prior art, after the representation pressure information and the codes for detecting the pen point position are obtained according to the detected pressure information, code printing signals corresponding to all code bits in the codes are generated, so that n code printing signals are obtained, and then the n code printing signals are transmitted by adopting different transmitting modes according to different codes; for binary coding, each of n coded bits of the binary coding has two coding values, each coded signal of the n coded signals is transmitted at a preset first frequency or a preset second frequency, namely, the coded signals corresponding to the coded bits with the coding values of 0 and 1 are respectively transmitted by adopting the first frequency and the second frequency, so that when the coded signals are detected by the touch screen, the coded values of all the coded bits can be identified according to the frequency of the detected signals, thereby realizing the transmission of pressure information, and meanwhile, the coded bits representing the pressure information can be used for detecting the pen point positions, so that the coordinates of the pen point positions are not required to be transmitted, the touch screen can acquire the coordinates of the pen point positions while detecting the pressure information, the detection time of the touch screen is reduced, the coordinates of more pen point positions can be output by the active pen in unit time, the coordinates of more pen point positions can be detected by the touch screen in unit time, and the point reporting rate is improved; for ternary coding, three coding values exist in each of n coding bits of ternary coding, each coding signal representing pressure information in the n coding signals is transmitted in a preset first frequency, a preset second frequency or a mode of prohibiting transmission, namely, when the pressure information is transmitted, a higher pressure level can be realized by using fewer coding bits, so that the time for transmitting the pressure information is reduced, the active pen can output more coordinates of the pen point position in unit time, and the point reporting rate is improved.
A second embodiment of the present application relates to a signal transmitting method, which is mainly different from the first embodiment in that: a specific implementation of signal synchronization of an active pen and a touch screen is provided.
The specific flow of the signal transmitting method in this embodiment is shown in fig. 10.
The steps 203 to 205 are substantially the same as the steps 101 to 103, and are not described herein, and the main difference is that the steps 201 and 202 are added, which is as follows:
step 201, in response to the synchronization signal sent by the touch screen, starting timing when the synchronization signal is ended, and judging whether the timing duration reaches the delay time. If yes, go to step 202; if not, return to step 201.
Specifically, referring to fig. 11, the touch screen 200 periodically sends a synchronization signal, after the touch screen 200 finishes sending the synchronization signal, the touch screen starts to detect a code signal of the active pen 100 after a preset delay time, and after detecting the code signal sent by the active pen 100, determines that the active pen 100 is close to the touch screen, so as to implement handshake with the active pen 100; before the code is not printed, the active pen 100 always detects the synchronous signal, when the synchronous signal sent by the touch screen 200 is detected, the synchronous signal is analyzed, the time for ending the synchronous signal is obtained from the characteristics of the synchronous signal, the timing is started after the synchronous signal is ended, whether the timing duration reaches the preset delay time is judged, if the timing reaches the delay time, the steps 202 to 204 are started to be executed to send the code printing signal, and after the synchronous signal is sent by the touch screen 200, the code printing signal is detected after the preset delay time is also passed, so that the synchronization of the active pen 100 and the touch screen 200 is realized, and after the code printing signals of two code bits are transmitted, the gap time is generally set so that the screen end judges the number of the code bits; if the time duration does not reach the delay time, continuing to count.
In this embodiment, the synchronization signal is composed of a plurality of pulse trains, specifically, the synchronization signal may be represented by a multi-bit binary number, each of which may be represented by a multi-bit encoded pulse, for example, a 32 encoded pulse, and the time occupied by each pulse may be set to 1us, for example, binary number 1 is represented by 0x98E1F28A, binary number 0 is represented by 0x671E0D75, please refer to fig. 12, and the synchronization signal of 1001 pulse train is represented. In this embodiment, the synchronization error of ±2us can be achieved between the active pen 100 and the touch screen 200 through the decoding of the pulse train.
Compared with the first embodiment, the embodiment provides a specific implementation manner of signal synchronization between the active pen and the touch screen.
A third embodiment of the present application relates to a signal transmitting method, which is mainly different from the first embodiment in that: the code can also characterize the pressing signal of the function key.
A specific flow of the signal transmitting method of this embodiment is shown in fig. 13.
Step 302, step 303, step 102 and step 103 are substantially the same, and are not described herein, and the main difference is that:
step 301, according to the detected pressure information and the pressing signal of the function key, obtaining the characterization pressure information, the pressing signal and the code for detecting the pen point position, wherein the code comprises n code bits.
Specifically, the active pen 100 further includes at least one function key, and the active pen 100 can obtain, according to the detected pressure information and the pressing signal of the function key, the characterizing pressure information, the pressing signal and the code for detecting the pen point position, where any one of the n code bits may be set as a key code bit characterizing the pressing signal; in this embodiment, the last code bit of the n code bits in the code may be set as a check code bit, the code value of the check code bit is a check value of the code values of the first n-1 code bits, and the calculation algorithm of the check value may be odd check, even check, accumulation and the like; specific examples are described below.
Referring to fig. 14, the third code bit of the binary code is a Key code bit Key, the sixth code bit of the binary code is a check code bit CRC, and the code values of the check code bit CRC are bit0-bit4 and the check value of the Key code bit Key.
Referring to fig. 15, the seventh code bit of the ternary code is a Key code bit Key, the 14 th code bit of the ternary code is a check code bit CRC, and the code values of the check code bit CRC are bit0-bit11 and the check values of the Key code bit Key.
In one example, the active pen 100 includes two function keys, and the pressing signals of the two function keys respectively correspond to key code bits of different code values, for example, the two function keys are respectively a key 1 and a key 2, when the key 1 is pressed, the pressing signal of the key 1 corresponds to the key code bit of the code value 1, and at this time, the key code bit corresponds to the code signal is transmitted at the first frequency; when the key 2 is pressed, the pressing signal of the key 2 corresponds to a key code bit with a code value of 0, and at this time, the key code bit corresponds to a code signal transmitted at a second frequency.
In this embodiment, the pressing signal of the function key can be also characterized in the code, compared with the first embodiment, so that the pressing signal of the function key can be transmitted at the same time. The present embodiment may be modified from the second embodiment, and the same technical effects may be achieved.
The fourth embodiment of the application relates to a signal receiving method, which is applied to a touch screen, wherein when the touch screen is in a signal detection stage of an active pen, code printing signals emitted by the active pen according to the signal emitting method of the first embodiment are detected.
The specific flow of the signal receiving method of this embodiment is shown in fig. 16.
Step 401, sequentially detecting n coding signals emitted by the active pen.
Specifically, as shown in fig. 1, the touch screen 200 includes a driving channel Y and a sensing channel X, and as can be seen from the first embodiment, when the codes are binary codes, the code signals corresponding to the code bits of each code value have a preset first frequency and a preset second frequency respectively; when the code is ternary code, for the pressure code bit used for representing the pressure information, the code signal corresponding to the pressure code bit of each code value has a first frequency, a second frequency and a forbidden transmission, and for the code signal corresponding to the coordinate code bit used for detecting the pen point position, the first frequency or the second frequency is referred to in the first embodiment, and details are not repeated here; the touch screen 200 may detect n code signals by setting n detection time slices corresponding to the driving channel Y or the sensing channel X, that is, the touch screen 200 sequentially detects n code signals corresponding to the codes transmitted by the active pen 100 through the driving channel Y and the sensing channel X, that is, for each coordinate code, two coordinate code bits corresponding to the coordinate code are detected by the driving channel Y and the sensing channel X respectively, and for the pressure code bit and other code bits, the code bit is sequentially detected by the driving channel Y or the sensing channel X. Referring to fig. 17, when the touch screen 200 performs detection, 6 detection time slices (bit 0-bit5 in fig. 17) are used to complete continuous detection of 6 code signals. The time slice length of the detection time slice may be equal to the time slice length of the code signal, for example, the time slice length of the code signal is 100us, and the time slice length of the detection time slice is also 100us.
For each coordinate code, two coordinate code bits corresponding to the coordinate code must be detected by the driving channel Y and the sensing channel X, respectively. Referring to fig. 18, when two coordinate encoding bits corresponding to the coordinate encoding are two adjacent encoding bits in the encoding, it may be set that the driving channel Y (TX in the figure) and the sensing channel X (RX in the figure) alternately detect n encoding signals in sequence.
And step 402, acquiring pressure information according to the frequency of the signal representing the pressure information in the detected n code signals.
Specifically, the corresponding relationship between the frequency and the code value is preset in the touch screen 200, which is the same as the corresponding relationship set in the active pen 100, so that for each signal representing the pressure information, the code value of the code bit of the pressure information corresponding to the signal is obtained according to the frequency of the signal, so that the code value of each code bit of the code corresponding to the pressure information can be obtained. Specifically, for the binary code, the touch screen 200 may preset that the first frequency f1 corresponds to the code value 1, and the second frequency f2 corresponds to the code value 0, referring to fig. 19, when the frequencies of the signals detected in each detection time slice are f1, f2, f1, and f2, respectively, the binary code sent by the active pen 100 is 101010, and then the binary code may be converted into decimal, so as to obtain pressure information of the pen tip of the active pen 100 on the touch screen 200; for ternary encoding, the touch screen 200 may preset that no signal corresponds to the encoded value 0, the first frequency f1 corresponds to the encoded value 1, and the second frequency f2 corresponds to the encoded value 2, please refer to fig. 15, and the frequencies of the signals detected in each detection time slice of the touch screen 200 are f2, no signal, f1, no signal, so that the ternary encoding sent by the active pen 100 is 20102010, and then the ternary encoding may be converted into decimal, so as to obtain the pressure information of the pen tip of the active pen 100 on the touch screen 200. After obtaining the pressure information of the pen tip of the active pen 100 on the touch screen 200, the touch screen 200 may present different stroke effects according to the pressure information, so as to give the user a better experience.
And step 403, obtaining coordinates of the pen point position according to the amplitude information of the detected signals used for detecting the pen point position in the n code signals.
Specifically, the coordinate code for detecting the pen tip position is pre-agreed in the active pen 100 and the touch screen 200, and the detection time slice for detecting the coordinate code is also pre-marked in the touch screen 200; referring to fig. 14, the code bits 1 and 2, 3 and 4, 5 and 6 are used to transmit 3 coordinate codes, respectively, and the detection time slices bit0 and bit1, bit2 and bit3, and bit4 and bit5 are used to detect 3 coordinate codes, respectively; referring to fig. 20, the code bits 1 and 2, and 7 and 8 are used to transmit 2 coordinate codes, respectively, and the detection time slices bit0 and bit1, and bit6 and bit7 are used to detect 2 coordinate codes, respectively. For each coordinate code, when two signals corresponding to two coordinate code bits of the coordinate code are detected by the touch screen 200 through two corresponding detection time slices, the two detection time slices are detected through a driving channel Y and a sensing channel X respectively, then the amplitude information of the two signals is obtained, the amplitude of the signals is compared with the amplitude of a threshold value, if the amplitude of the signals is smaller than the threshold value, the active pen is judged to not emit a code signal, or if the amplitude of the signals is larger than the threshold value, the active pen is judged to emit a code signal, and the coordinates of the position corresponding to the pen point of the coordinate code are obtained according to the amplitude information of the two signals; specifically, the driving channel Y includes a plurality of driving electrodes, the sensing channel includes a plurality of sensing electrodes, and for two signals corresponding to one coordinate code, the amplitude information of one of the signals detected by the driving channel Y includes: the amplitude of the signal corresponding to each driving electrode, and the sensing channel X detects the amplitude information of the other signal, which comprises the following steps: amplitude of signal corresponding to each sensing electrode; the larger the amplitude of the signal is, the closer the nib of the active pen 100 is to the electrode, then the drive electrode corresponding to the signal with the largest amplitude is selected from the amplitudes of the signals corresponding to the plurality of drive electrodes, the sense electrode corresponding to the signal with the largest amplitude is selected from the amplitudes of the signals corresponding to the plurality of sense electrodes, and the coordinates of the nib position corresponding to the coordinate code are calculated, for example, the drive channel Y includes 10 drive electrodes and the sense channel includes 10 sense electrodes, a coordinate system can be formed by taking the upper left corner as the origin, if the drive electrode corresponding to the signal with the largest amplitude is the 3 rd drive electrode and the sense electrode corresponding to the signal with the largest amplitude is the 4 th sense electrode, and the touch screen calculates the coordinates of the active pen according to the gravity center method.
In an example, referring to fig. 21, it may be set that the detection time slice can detect the code signal of the first frequency and the second frequency at the same time, and step 403 obtains coordinates of the pen point position according to the amplitude information of the detected signal for pen point position detection in the n code signals, including the following substeps:
substep 4031: for each signal for pen tip position detection, amplitude information of the signal of the first frequency and amplitude information of the signal of the second frequency are compared. If the amplitude information of the signal at the first frequency is greater than the amplitude information of the signal at the second frequency, then go to sub-step 4032; if the amplitude information of the signal at the first frequency is less than the amplitude information of the signal at the second frequency, then sub-step 4032 is entered.
Substep 4032 calculates coordinates of the pen tip location based on the amplitude information of the signal at the first frequency.
Substep 4033 calculates coordinates of the pen tip location based on the amplitude information of the signal at the second frequency.
Specifically, taking any coordinate code as an example, two coding signals corresponding to the coordinate code are respectively driven by a channel Y and a sensing channel X to be detected in sequence, for the driving channel Y, after the driving channel Y detects a signal F1 with a first frequency and a signal F2 with a second frequency, the driving channel Y obtains the maximum amplitude Data1 in the amplitude information of the signal F1 and the maximum amplitude Data2 in the amplitude information of the signal F2, the size relation between the Data1 and the Data2 is judged, if the Data1 is more than the Data2, the driving pen 100 is indicated to emit the signal with the first frequency, the abscissa of the pen point position is calculated by using the amplitude signal of the signal with the first frequency, and if the Data1 is less than the Data2, the driving pen 100 is indicated to emit the signal with the second frequency, and the abscissa of the pen point position is calculated by using the amplitude signal of the signal with the second frequency; for sensing channel X, repeating the above procedure, if Data1 > Data2, it is explained that the active pen 100 emits the signal at a first frequency, the ordinate of the pen tip position is calculated using the amplitude signal of the signal at the first frequency, and if Data1 < Data2, it is explained that the active pen 100 emits the signal at a second frequency, the ordinate of the pen tip position is calculated using the amplitude signal of the signal at the second frequency.
It should be noted that, the execution sequence of the step 402 and the step 403 is not limited in this embodiment.
Since the first to third embodiments correspond to the present embodiment, the present embodiment can be implemented in cooperation with the first to third embodiments. The related technical details mentioned in the first to third embodiments are still valid in this embodiment, and the technical effects that can be achieved in the first to third embodiments are also achieved in this embodiment, so that the repetition is reduced and the description is omitted here. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first to third embodiments.
Compared with the prior art, the method and the device have the advantages that after the representation pressure information and the codes for detecting the pen point position are obtained according to the detected pressure information, code printing signals corresponding to all code bits in the codes are generated, so that n code printing signals are obtained, and then the n code printing signals are transmitted by adopting different transmitting modes according to different codes; for binary coding, each of n coded bits of the binary coding has two coding values, each coded signal of the n coded signals is transmitted at a preset first frequency or a preset second frequency, namely, the coded signals corresponding to the coded bits with the coding values of 0 and 1 are respectively transmitted by adopting the first frequency and the second frequency, so that when the coded signals are detected by the touch screen, the coded values of all the coded bits can be identified according to the frequency of the detected signals, thereby realizing the transmission of pressure information, and meanwhile, the coded bits representing the pressure information can be used for detecting the pen point positions, so that the coordinates of the pen point positions are not required to be transmitted, the touch screen can acquire the coordinates of the pen point positions while detecting the pressure information, the detection time of the touch screen is reduced, the coordinates of more pen point positions can be output by the active pen in unit time, the coordinates of more pen point positions can be detected by the touch screen in unit time, and the point reporting rate is improved; for ternary coding, three coding values exist in each of n coding bits of ternary coding, each coding signal representing pressure information in the n coding signals is transmitted in a preset first frequency, a preset second frequency or a mode of prohibiting transmission, namely, when the pressure information is transmitted, a higher pressure level can be realized by using fewer coding bits, so that the time for transmitting the pressure information is reduced, the active pen can output more coordinates of the pen point position in unit time, and the point reporting rate is improved.
A fifth embodiment of the present application is directed to a processor chip for performing the signal receiving method of any one of the first to third embodiments.
A sixth embodiment of the application is directed to an active pen comprising the processor chip of the fifth embodiment.
A seventh embodiment of the present application relates to a touch screen, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the signal receiving method of the fourth embodiment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the application and that various changes in form and details may be made therein without departing from the spirit and scope of the application.
Claims (19)
1. A signal transmission method for use with an active pen, the method comprising:
according to the detected pressure information, obtaining codes representing the pressure information and used for detecting the position of the pen point, wherein the codes comprise n code bits, and n is an integer greater than 1;
Generating n coding signals corresponding to the n coding bits; wherein n coded bits are used as n pressure coded bits for representing the pressure information, and any two of the n pressure coded bits are used as coordinate codes for detecting the position of the pen point;
transmitting each of the n code signals at a preset first frequency or a preset second frequency;
wherein the first and second frequencies of n of the encoded signals are related to the pressure information.
2. The signal transmission method of claim 1, wherein the deriving a code characterizing the pressure information and used for pen tip position detection based on the detected pressure information comprises:
and obtaining the pressure information, the pressing signal and the code for detecting the position of the pen point according to the detected pressure information and the pressing signal of the function key.
3. The signal transmission method of claim 2, wherein any one of the n code bits is used as a key code bit for characterizing a press signal.
4. A signal transmitting method according to claim 3, wherein the active pen comprises two function keys, the pressing signals of the two function keys respectively corresponding to the key code bits of different code values.
5. The signal transmission method of claim 1, further comprising, prior to said deriving a code characterizing said pressure information and for pen tip position detection based on said detected pressure information:
and responding to a synchronous signal sent by the touch screen, starting timing after the synchronous signal is ended, and entering the step of obtaining the code representing the pressure information and used for detecting the position of the pen point according to the detected pressure information when the timing duration reaches the preset delay time.
6. The signal transmission method of claim 1, wherein the first frequency and the second frequency each correspond to the pressure encoded bits of different encoded values.
7. The method of signal transmission according to claim 6, wherein the first frequency corresponds to the pressure encoded bit having a code value of "0", and the second frequency corresponds to the pressure encoded bit having a code value of "1".
8. The signal transmission method of claim 1, wherein two of said pressure encoded bits corresponding to said coordinate encoding are adjacent among n of said pressure encoded bits.
9. The signal transmission method of claim 1, wherein if n is an odd number, the number of coordinate codes is (n-1)/2; if n is an even number, the number of the coordinate codes is n/2.
10. The signal transmission method of claim 1, wherein the n encoded bits further comprise check encoded bits.
11. A method of transmitting signals according to any one of claims 1 to 10, wherein the code is binary code.
12. A signal receiving method, applied to a touch screen, the method comprising:
sequentially detecting n code printing signals transmitted by an active pen, wherein the n code printing signals respectively have preset first frequency or preset second frequency; the n coding signals respectively represent the pressure information detected by the active pen and n coding bits used for detecting the pen point position, the n coding bits are used as n pressure coding bits representing the pressure information, and any two of the n pressure coding bits are used as coordinate codes used for detecting the pen point position;
acquiring pressure information according to the frequency of the signal representing the pressure information in the detected n coding signals;
and obtaining coordinates of the pen point position according to the detected amplitude information of the signals used for detecting the pen point position in the n coding signals.
13. The signal receiving method of claim 12, wherein acquiring the pressure information based on the frequency of a signal characterizing the pressure information among the detected n coded signals, comprises:
For each signal representing pressure information, acquiring the coding value of the coding bit of the signal corresponding to the pressure information according to the frequency of the signal.
14. The signal receiving method of claim 12, wherein the touch screen includes a driving channel and a sensing channel, and the sequentially detecting n code signals emitted by the active pen includes:
and detecting n coding signals sequentially through the driving channel and the sensing channel.
15. The signal receiving method of claim 14, wherein the drive channel comprises a plurality of drive electrodes and the sense channel comprises a plurality of sense electrodes; the amplitude information comprises the amplitude of the signal detected by each driving electrode and the amplitude of the signal detected by each sensing electrode;
the obtaining coordinates of the pen point position according to the detected amplitude information of the signals used for detecting the pen point position in the n code printing signals includes:
comparing the amplitude of the signal with a threshold value, if the amplitude of the signal is smaller than the threshold value, judging that the active pen does not emit the code printing signal, or if the amplitude of the signal is larger than the threshold value, judging that the active pen emits the code printing signal;
And selecting the driving electrode corresponding to the signal with the largest amplitude and the sensing electrode corresponding to the signal with the largest amplitude for the signal used for detecting the position of the pen point, and calculating the coordinate of the position of the pen point.
16. The signal receiving method of claim 12, wherein the obtaining coordinates of the pen point position based on the detected amplitude information of the signal for pen point position detection among the n code signals includes:
comparing amplitude information of the signal of the first frequency with amplitude information of the signal of the second frequency for each signal for pen tip position detection, and if the amplitude information of the signal of the first frequency is greater than the amplitude information of the signal of the second frequency, calculating coordinates of pen tip positions according to the amplitude information of the signal of the first frequency; if the amplitude information of the signal of the first frequency is smaller than the amplitude information of the signal of the second frequency, calculating coordinates of the pen point position according to the amplitude information of the signal of the second frequency.
17. A processor chip for performing the signal transmission method of any one of claims 1 to 11.
18. An active pen, comprising: the processor chip of claim 17.
19. A touch screen, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the signal receiving method of any one of claims 12 to 16.
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| PCT/CN2019/109485 WO2021062641A1 (en) | 2019-09-30 | 2019-09-30 | Signal transmitting and receiving methods, processor chip, active pen, and touch screen |
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| WO2022165839A1 (en) * | 2021-02-08 | 2022-08-11 | 深圳市汇顶科技股份有限公司 | Method for preventing interference, touch chip, and active pen chip |
| CN112558798A (en) * | 2021-02-19 | 2021-03-26 | 深圳市千分一智能技术有限公司 | Communication method and device of active pen, terminal and storage medium |
| CN114461092B (en) * | 2021-08-19 | 2022-10-11 | 荣耀终端有限公司 | Touch pen connection method and electronic equipment |
| CN114661189B (en) * | 2022-02-15 | 2024-06-07 | 深圳市千分一智能技术有限公司 | Coding method and system of capacitance pen, capacitance pen and storage medium |
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