[특허]Detection circuit for matrix touch pad

Detection circuit for matrix touch pad 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03M-011/20
출원번호	US-0598129 (1990-10-16)
발명자 / 주소	Caldwell David W. (Holland MI) Medendorp Nicholas W. (Holland MI)
출원인 / 주소	Donnelly Corporation (Holland MI 02)
인용정보	피인용 횟수 : 51 인용 특허 : 0

초록 ▼

A circuit for detecting user contact of one of a plurality of touch pads includes a plurality of drive lines and a plurality of sense lines coupled with the touch pads. A sense circuit responsive to the signals on the sense lines produces a pulse having a width that is proportional to the amplitude of each of the sense signals. A control circuit measures the width of the pulses produced by the sense circuit and compares each measured pulse width to a reference pulse width to distinguish between a touch and no-touch condition for each touch pad. The sense circuit is illustrated in the form of a comparator having a threshold input that is always exceeded by the sense signal to produce the variable width pulse. Separate amplifiers may be provided for each sense line.

대표청구항 ▼

A circuit for detecting user contact of one of a plurality of touch pads comprising: a plurality of drive lines and a plurality of sense lines, each of said touch pads being coupled to a difference combination of said drive and sense lines from any other of said touch pads; driver circuit means for providing pulsed drive signals to said drive lines; at least one amplifier having an input connected at a given time to one of said sense lines, an output and gain means for establishing the gain of said at least one amplifier; and demodulating means responsive to said at least one amplifier output for determining which of said touch pads is being contacted by a user, wherein said demodulating means includes at least one comparator means responsive at said given time to the amplified sensed signal of said one of said sense lines for producing a pulse having a width that is a function of the time that the associated amplified sensed signal is above a given reference level.

이 특허를 인용한 특허 (51)

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Rebeschi, Thomas J.; Cordeiro, Craig A.; Farlow, William, Capacitive-based touch apparatus and method therefor, with reduced interference.
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Trattler, Peter, Circuit arrangement and method for the operation of a circuit arrangement.
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Huang, Chun-Chung; Wang, Tsun-Min; Chiu, Te-Sheng, Detection method for a capacitive touchpad to identify a real touch point.
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Huang, Chun-Chung; Wang, Tsun-Min; Chiu, Te-Sheng, Detector and detection method for a capacitive touchpad to identify a real touch point.
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Caldwell David W., Differential touch sensor and control circuit therefor.
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Liu, Tao, Electronic device for controlling high-voltage with multiple low-voltage switches.
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Simon Barry S., Ergonomic palm operated soft touch control with multi-plane sensing pads.
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Rebeschi, Thomas J.; Cordeiro, Craig A., High speed low power multi-touch touch device and controller therefor.
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Cordeiro, Craig A.; Rebeschi, Thomas J., High speed multi-touch touch device and controller therefor.
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Cordeiro, Craig A.; Rebeschi, Thomas J., High speed noise tolerant multi-touch touch device and controller therefor.
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Bardachenko Vitali F. (Kiev UAX) Khokhlov Vitali I. (Moskau RUX) Munker Michael (Munich DEX) Shurchkov Igor O. (Moskau RUX), Information input device.
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Gray, Michael S.; Gray, Patrick T.; Yamamoto, Sadao, Meshed touchscreen pattern.
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Himpe, Vincent, Method and apparatus for keyboard readout.
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Lin, Chien-Ming; Hsieh, Ming-Ta; Chen, Chih-Chung; Yin, Hsueh-Fang; Liu, Chia-Lin, Method for determining touch signal generating by sensor structure of touch panel.
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Gershenfeld Neil ; Smith Joshua R., Method for resolving presence, orientation and activity in a defined space.
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Marino, Rachael P.; Peterson, Jr., Richard A., Multi-touch touch device with multiple drive frequencies and maximum likelihood estimation.
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Geaghan, Bernard O., Mutual capacitance measuring circuits and methods.
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Jinno Kazunori,JPX ; Ofuji Masahiro,JPX, Passenger detection system.
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Paulsen, Keith L.; Paulsen, Andrew, Sample and hold analog front end for a capacitive touchpad.
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Thomas, Alfred, Security zones for casino gaming.
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Wang, Tsun-Min; Lin, Chun-Yu; Chiu, Te-Sheng; Huang, Chun-Chung, Sensing circuit and method for a capacitive touch panel.
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Wang, Tsun-Min; Lin, Chun-Yu; Chiu, Te-Sheng; Huang, Chun-Chung, Sensing circuit and method for a capacitive touch panel.
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Lin, Chien-Ming; Hsieh, Ming-Ta; Chen, Chih-Chung; Yin, Hsueh-Fang; Liu, Chia-Lin, Sensor structure of touch panel and method for determining touch signal generating by sensor structure of touch panel.
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Kobayashi, Kazuyuki; Suzuki, Tatsuya; Fukai, Kumiko; Kaneta, Yasuhiro, Signal processing device of touch panel.
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Post, E. Rehmatulla; Gershenfeld, Neil, Three-dimensional characterization using a one-dimensional electrode array.
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Reynolds, Joseph Kurth; Day, Shawn P., Touch Pad with flexible substrate.
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Caldwell David W. ; Medendorp Nicholas W., Touch control system.
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Hable, Brock A.; Weaver, Billy Lee, Touch sensitive device using threshold voltage signal.
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Rebeschi, Thomas J.; Weaver, Billy L.; Hable, Brock A., Touch sensitive device with stylus support.
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Weaver, Billy L.; Rebeschi, Thomas J.; Hable, Brock A., Touch sensitive device with stylus support.
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Caldwell David W. (Lapeer MI), Touch sensor and control circuit therefor.
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Caldwell David W., Touch switch with integral control circuit.
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Caldwell, David W.; Oppor, Rick L.; Gioiosa, Anthony V.; Campbell, Robert B.; Schreiber, Thomas M.; Wadia, Bahar N.; Mathews, Mark R.; Mueller, Donald Charles; Eavenson, Daniel, Touch switches and practical applications therefor.
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Gray, Patrick T.; Yamamoto, Sadao, Touchscreen with extended conductive pattern.
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Jinno Kazunori ; Sekido Saikichi,JPX ; Rittmueller Philip H., Vehicle passenger sensing system and method.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Detection circuit for matrix touch pad 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (51)

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연합인증

Detection circuit for matrix touch pad 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

전체(0) 논문(0) 특허(0) 보고서(0)

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이 특허를 인용한 특허 (51)

관련 콘텐츠

특허 원문 보기

IPC 상위 출원인

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