# US 2021/0240299 A1 · Touch Detection Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0240299 A1 - Document ID: US20210240299A1 - Status: Published application - Kind: A1 - Application number: 17/239,827 - Filed: 2021-04-26 - Published: 2021-08-05 - Earliest claimed: 2018-10-26 - Assignees: Tyco Electronics (Shanghai) Co., Ltd. - Applicants: Tyco Electronics (Shanghai) Co. Ltd. - Inventors: Yulin Feng; Yuming Song; Jin Chen; Yifeng Jiang - Web page: https://patentgrep.com/patent/US20210240299A1 ## CPC - G06F 3/043: using propagating acoustic waves - G06F 3/0436: {in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate} - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/04182: {Filtering of noise external to the device and not generated by digitiser components} - G06F 3/04186: {Touch location disambiguation} - H03K 17/964: {Piezoelectric touch switches} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract A touch detection device includes a touch panel, a piezoelectric sensor mounted on the touch panel for detecting a tap event applied to the touch panel, and a control circuit board in electrical communication with the piezoelectric sensor. The control circuit board includes a signal processing circuit for processing a detection signal output from the piezoelectric sensor, and a controller for determining whether the tap event is a correct human finger tap event based on the processed detection signal. ## Claims ### Claim 1 A touch detection device, comprising: a touch panel; a piezoelectric sensor mounted on the touch panel and adapted to detect a tap event applied to the touch panel; and a control circuit board in electrical communication with the piezoelectric sensor, and including: a signal processing circuit adapted to process a detection signal output from the piezoelectric sensor; and a controller adapted to determine whether the tap event is a correct human finger tap event based on the processed detection signal. ### Claim 2 (depends on 1) The touch detection device according to claim 1, wherein the signal processing circuit includes: a filter for filtering out noise signals that do not satisfy a predetermined condition from the detection signal; an amplifier adapted to amplify the filtered detection signal to a desired range; and a comparator including an upper-threshold comparator with a predetermined upper-threshold voltage and a lower-threshold comparator with a predetermined lower-threshold voltage for processing the amplified detection signal into a first DC voltage digital signal and a second DC voltage digital signal. ### Claim 3 (depends on 2) The touch detection device according to claim 2, wherein the controller is further adapted to: calculate a first time difference between an end time and a start time of the detected first DC voltage digital signal; calculate a second time difference between the start time of the detected first DC voltage digital signal and a start time of the second DC voltage digital signal detected just after the detected first DC voltage digital signal; and determine whether the tap event is a correct human finger tap event based on the calculated first time difference and the calculated second time difference. ### Claim 4 (depends on 3) The touch detection device according to claim 3, wherein, if the calculated first time difference is within a first threshold range and the calculated second time difference is within a second threshold range, the controller determines that the tap event is a correct human finger tap event. ### Claim 5 (depends on 4) The touch detection device according to claim 4, wherein, if the calculated first time difference exceeds the first threshold range or the calculated second time difference exceeds the second threshold range, the controller determines that the tap event is not a correct human finger tap event. ### Claim 6 (depends on 5) The touch detection device according to claim 5, wherein the first threshold range is 300 μs˜800 μs, and the second threshold range is 300 82 s˜1400 μs. ### Claim 7 (depends on 4) The touch detection device according to claim 4, wherein, in a condition where the controller determines that the tap event is a correct human finger tap event, if the first DC voltage digital signal is detected by the controller only once, the controller determines that the tap event is a single-click event. ### Claim 8 (depends on 4) The touch detection device according to claim 4, wherein, in a condition where the controller determines that the tap event is a correct human finger tap event, if the first DC voltage digital signal is detected by the controller twice and a time interval between two adjacent first DC voltage digital signals detected by the controller is within a third threshold range, the controller determines that the tap event is a double-click event. ### Claim 9 (depends on 8) The touch detection device according to claim 8, wherein the third threshold range is 200 ms˜500 ms. ### Claim 10 (depends on 1) The touch detection device according to claim 1, wherein the touch panel is adapted to be mounted on a support body, and the touch detection device further includes an acoustic wave absorbing material adapted to be provided between the touch panel and the support body for acoustically isolating the touch panel from the support so as to prevent sound waves generated on the support body from being transmitted to the touch panel. ### Claim 11 (depends on 10) The touch detection device according to claim 10, wherein the support body is formed as a housing and the touch panel is embedded in an opening of the support body. ### Claim 12 (depends on 11) The touch detection device according to claim 11, wherein the acoustic wave absorbing material is arranged at the peripheral edge of the touch panel. ### Claim 13 (depends on 11) The touch detection device according to claim 11, wherein the touch panel is supported on a surface of the support body, and the acoustic wave absorbing material is provided on a bottom of the touch panel. ### Claim 14 (depends on 1) The touch detection device according to claim 1, wherein the touch panel comprises a circular panel, a square panel or a curved surface panel. ### Claim 15 (depends on 1) The touch detection device according to claim 1, wherein the touch panel is made of glass, stainless steel or wood. ### Claim 16 (depends on 1) The touch detection device according to claim 1, wherein the piezoelectric sensor is a piezoelectric thin film sensor or a piezoelectric ceramic sensor. ### Claim 17 A touch detection device, comprising: a touch panel including a sensor adapted to detect a tap event applied to the touch panel; a signal processing circuit operatively connected to the sensor for receiving and processing a detection signal output from the sensor; and a controller for determining whether the tap event is a correct human finger tap event based on the processed detection signal, the controller, in response to the receipt of a first DC voltage signal and a second DC voltage signal generated by the signal processing circuit, adapted to: calculate a first time difference between an end time and a start time of the detected first DC voltage digital signal; calculate a second time difference between the start time of the detected first DC voltage digital signal and a start time of the second DC voltage digital signal detected just after the detected first DC voltage digital signal; and determine whether the tap event is a correct human finger tap event based on the calculated first time difference and the calculated second time difference. ### Claim 18 (depends on 17) The touch detection device according to claim 17, wherein the controller determines that the tap event is a correct human finger tap event if the calculated first time difference is within a first threshold range and the calculated second time difference is within a second threshold range. ### Claim 19 (depends on 18) The touch detection device according to claim 18, wherein the controller determines that the tap event is not a correct human finger tap event if the calculated first time difference exceeds the first threshold range or the calculated second time difference exceeds the second threshold range. ### Claim 20 (depends on 17) The touch detection device according to claim 17, wherein the controller is further adapted to: determine that the tap event is a single-click event when the controller determines that the tap event is a correct human finger tap event and the first DC voltage digital signal is detected by the controller only once; and determine that the tap event is a double-click event when the controller determines that the tap event is a correct human finger tap event, and the first DC voltage digital signal is detected by the controller twice and a time interval between two adjacent first DC voltage digital signals detected by the controller is within a third threshold range.