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TW200715175A - Capacitance touchpad data input device and keyboard - Google Patents

Capacitance touchpad data input device and keyboard

Info

Publication number
TW200715175A
TW200715175A TW094134436A TW94134436A TW200715175A TW 200715175 A TW200715175 A TW 200715175A TW 094134436 A TW094134436 A TW 094134436A TW 94134436 A TW94134436 A TW 94134436A TW 200715175 A TW200715175 A TW 200715175A
Authority
TW
Taiwan
Prior art keywords
capacitance sensing
sensing module
input device
key
data input
Prior art date
Application number
TW094134436A
Other languages
Chinese (zh)
Other versions
TWI320903B (en
Inventor
James Y Gao
yong-qing Ren
Original Assignee
Apexone Microelectronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apexone Microelectronics Ltd filed Critical Apexone Microelectronics Ltd
Priority to TW94134436A priority Critical patent/TWI320903B/en
Publication of TW200715175A publication Critical patent/TW200715175A/en
Application granted granted Critical
Publication of TWI320903B publication Critical patent/TWI320903B/en

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  • Input From Keyboards Or The Like (AREA)

Abstract

A data input device (300) includes multiple keys formed by conductor plates underlying a dielectric layer. Each of the first and second keys (331, 332) has one conductor plate (12, 24) coupled to a corresponding capacitance sensing module (312, 314). The third key (333) has two conductor plates, one (32) coupled to the first capacitance sensing module (312) and the other (34) coupled to the second capacitance sensing module (314). When a user touches a key (331), the user and the conductor plate (12) forms a sensing capacitor (113) having a capacitance greater than that of a reference capacitor (123). A comparison module (130) in the corresponding capacitance sensing module (312) generates a digital bit signal indicating the key (331) being touched. A decoder (301) decodes the digital bit signals of the multiple capacitance sensing modules (331, 332, 333) to generate a digital data signal accordingly.
TW94134436A 2005-10-03 2005-10-03 Capacitance touchpad data input device and keyboard TWI320903B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94134436A TWI320903B (en) 2005-10-03 2005-10-03 Capacitance touchpad data input device and keyboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94134436A TWI320903B (en) 2005-10-03 2005-10-03 Capacitance touchpad data input device and keyboard

Publications (2)

Publication Number Publication Date
TW200715175A true TW200715175A (en) 2007-04-16
TWI320903B TWI320903B (en) 2010-02-21

Family

ID=45073784

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94134436A TWI320903B (en) 2005-10-03 2005-10-03 Capacitance touchpad data input device and keyboard

Country Status (1)

Country Link
TW (1) TWI320903B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI381302B (en) * 2008-11-12 2013-01-01 Tpo Displays Corp Capacitive touch panel and capacitance sensing apparatus and method for the same
TWI414981B (en) * 2009-10-09 2013-11-11 Egalax Empia Technology Inc Method and device for dual-differential sensing
TWI563441B (en) * 2015-11-11 2016-12-21 Focaltech Electronics Ltd Touch apparatus, capacitive touch detecting circuit thereof and touch detecting method using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI381302B (en) * 2008-11-12 2013-01-01 Tpo Displays Corp Capacitive touch panel and capacitance sensing apparatus and method for the same
TWI414981B (en) * 2009-10-09 2013-11-11 Egalax Empia Technology Inc Method and device for dual-differential sensing
TWI464634B (en) * 2009-10-09 2014-12-11 Egalax Empia Technology Inc Method and device for dual-differential sensing
TWI563441B (en) * 2015-11-11 2016-12-21 Focaltech Electronics Ltd Touch apparatus, capacitive touch detecting circuit thereof and touch detecting method using the same
US9836172B2 (en) 2015-11-11 2017-12-05 Focaltech Electronics, Ltd. Touch apparatus, capacitive touch sensing circuit thereof, and touch sensing method using the same

Also Published As

Publication number Publication date
TWI320903B (en) 2010-02-21

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees