# US 11,307,703 B2 · Method for transmitting and receiving signal, processor chip, active stylus and touch screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,703 B2 - Document ID: US11307703B2 - Status: Granted - Kind: B2 - Application number: 17/123,776 - Filed: 2020-12-16 - Published: 2021-04-08 - Granted: 2022-04-19 - Earliest claimed: 2019-09-30 - Assignees: Shenzhen Goodix Technology Co., Ltd. - Applicants: Shenzhen Goodix Technology Co., Ltd. - Inventors: Qiquan Liang - Web page: https://patentgrep.com/patent/US11307703B2 ## CPC - G06F 3/04162: {for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware} - G06F 3/03545: {Pens or stylus} - G06F 3/038: Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry - G06F 3/0383: {Signal control means within the pointing device} - G06F 3/0441: {using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals} - G06F 3/0442: {using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Some embodiments of the present disclosure provide a method for transmitting and receiving a signal, a processor chip, an active stylus, and a touch screen. The method for transmitting a signal includes: acquiring, based on detected pressure information, codes representing pressure information and used to detect tip positions, where the code includes n code bits, n being an integer greater than 1; generating n coded signals respectively corresponding to the n code bits; and transmitting each coded signal in the coded signals at the preset first or second frequency or prohibiting transmission of each coded signal in the coded signals, where the first frequency, the second frequency and prohibited transmission of the n coded signals relate to the pressure information. ## Claims ### Claim 1 A method for transmitting a signal, applied to active styli, comprising: acquiring, based on detected pressure information, codes representing pressure information and used to detect tip positions, where the codes comprise n code bits, n being an integer greater than 1; wherein the n code bits further comprise a check code bit; generating n coded signals respectively corresponding to the n code bits; and transmitting each coded signal representing pressure information in the coded signals at a preset first frequency or second frequency or prohibiting transmission of each coded signal representing pressure information in the coded signals; wherein the first frequency, the second frequency and prohibited transmission of the n coded signals relate to the pressure information. ### Claim 2 (depends on 1) The method for transmitting a signal according to claim 1, wherein a part of the n code bits serve as n pressure code bits representing the pressure information, and another part of the n code bits serve as a coordinate code bit used to detect tip positions. ### Claim 3 (depends on 1) The method for transmitting a signal according to claim 1, wherein each coded signal used to detect tip positions in n coded signals is transmitted at the first frequency or second frequency. ### Claim 4 (depends on 1) The method for transmitting a signal according to claim 1, wherein acquiring, based on detected pressure information, codes representing pressure information and used to detect tip positions comprises: acquiring, based on detected pressure information and pressing signals of function buttons, codes representing the pressure information and pressing signals and used to detect tip positions. ### Claim 5 (depends on 4) The method for transmitting a signal according to claim 4, wherein any of the code bits serves as a key code bit representing the pressing signals. ### Claim 6 (depends on 5) The method for transmitting a signal according to claim 5, wherein the active stylus comprises two function buttons, and the pressing signals of the two function buttons correspond to the key code bit with different code values respectively. ### Claim 7 (depends on 1) The method for transmitting a signal according to claim 1, wherein before acquiring, based on detected pressure information, the codes representing pressure information and used to detect tip positions, further comprising: in response to a synchronizing signal transmitted by the touch screen, acquiring the delay time from the synchronizing signal; start timing when the synchronizing signal ends; and entering the step of acquiring, based on detected pressure information, codes representing pressure information and used to detect tip positions when the timing length reaches a preset delay time. ### Claim 8 (depends on 2) The method for transmitting a signal according to claim 2, wherein the first frequency, the second frequency and prohibited transmission correspond respectively to the pressure code bits with different code values. ### Claim 9 (depends on 1) The method for transmitting a signal according to claim 1, wherein the codes are ternary. ### Claim 10 (depends on 9) The method for transmitting a signal according to claim 9, wherein prohibited transmission corresponds to the pressure code bit with a ternary code value “0”, the first frequency corresponds to the pressure code bit with a ternary code value “1”, and the second frequency corresponds to the pressure code bit with a ternary code value “2”. ### Claim 11 (depends on 2) The method for transmitting a signal according to claim 2, wherein two coordinate code bits corresponding to the coordinate code are adjacent to each other in the n code bits. ### Claim 12 A method for receiving a signal, applied to touch screens, comprising: detecting, in sequence, n coded signals transmitted by the active stylus in sequence where the n coded signals have a preset first frequency or second frequency or are prohibited to be transmitted; wherein the n coded signals respectively correspond to n code nodes, and the n code bits further comprise a check code bit; acquiring pressure information based on frequency and prohibited transmission of signals representing pressure information in n detected coded signals; and acquiring coordinates of tip positions based on amplitude information of signals used to detect tip positions in n detected coded signals. ### Claim 13 (depends on 12) The method for transmitting a signal according to claim 12, wherein acquiring pressure information based on the frequency and prohibited transmission of signals representing pressure information in the n detected coded signals, comprises: with respect to each signal representing pressure information, acquiring the code values of the code bits of the signal corresponding to the pressure information based on the frequency and prohibited transmission of the signal. ### Claim 14 (depends on 12) The method for receiving a signal according to claim 12, wherein the touch screen comprises driving channels and sensing channels, wherein detecting, in sequence, n coded signals transmitted by the active stylus comprises: detecting the n coded signals in sequence by the driving channels and the sensing channels. ### Claim 15 (depends on 14) The method for receiving a signal according to claim 14, wherein the driving channel comprises multiple driving electrodes, the sensing channel comprises multiple sensing electrodes, and the amplitude information comprises the amplitudes of the signal detected by all driving electrodes and those detected by all sensing electrodes; acquiring the coordinates of tip positions based on the amplitude information of signals used to detect tip position in n detected coded signals, comprises: comparing the amplitude of the signal with the threshold value; if the amplitude of the signal is smaller than the threshold value, no transmission of the coded signals by the active stylus is determined; if the amplitude is larger than the threshold value, transmission of the coded signals by the active stylus is determined; with respect to signals used to defect tip positions, the driving electrode corresponding to the signal with the maximum amplitude and the sensing electrode corresponding to the signal with the maximum amplitude are used to calculate the coordinates of the tip position. ### Claim 16 (depends on 12) The method for receiving a signal according to claim 12, wherein acquiring coordinates of tip positions based on the amplitude information of the signals used to detect tip positions in n detected coded signals further comprises: with respect to each signal used to detect tip positions, comparing the amplitude information of the signal at the first frequency and that of the signal at the second frequency; if the amplitude information of the signal at the first frequency exceeds that of the signal at the second frequency, the amplitude information of the signal at the first frequency is used to calculate the coordinates of the tip position; if the amplitude information of the signal at the second frequency exceeds that of the signal at the first frequency, the amplitude information of the signal at the second frequency is used to calculate the coordinates of the tip position. ### Claim 17 (depends on 1) A processor chip, wherein the processor chip is configured to perform the method for transmitting a signal in claim 1. ### Claim 18 (depends on 17) An active stylus, comprising: the processor chip according to claim 17. ### Claim 19 (depends on 12) A touch screen, comprising: at least one processor; and, a memory connected and in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions, when executed by the at least one processor, cause the at least one processor to perform the method for receiving a signal in claim 12.