TW200737253A - Keyboard without ghost keys - Google Patents

Keyboard without ghost keys

Info

Publication number
TW200737253A
TW200737253A TW095109069A TW95109069A TW200737253A TW 200737253 A TW200737253 A TW 200737253A TW 095109069 A TW095109069 A TW 095109069A TW 95109069 A TW95109069 A TW 95109069A TW 200737253 A TW200737253 A TW 200737253A
Authority
TW
Taiwan
Prior art keywords
keyboard
level resistance
electrically connected
signal switches
ghost keys
Prior art date
Application number
TW095109069A
Other languages
Chinese (zh)
Other versions
TWI320939B (en
Inventor
Tian-Min Lv
Original Assignee
Zippy Tech Corp
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 Zippy Tech Corp filed Critical Zippy Tech Corp
Priority to TW095109069A priority Critical patent/TW200737253A/en
Publication of TW200737253A publication Critical patent/TW200737253A/en
Application granted granted Critical
Publication of TWI320939B publication Critical patent/TWI320939B/zh

Links

Abstract

This invention relates to a keyboard without ghost keys having an internal circuit which includes a microprocessor, in which a plurality of I/O lines form a keyboard scanning matrix. Two of the I/O lines on the matrix cross to define a plurality of signal switches. The microprocessor is electrically connected to a primary level resistance and a reference potential to determine the ON condition of the signal switches. Each signal switch further is electrically connected to at least one secondary level switch which is electrically connected to the primary level switch in serial. When a user presses any three signal switches on the rectangular angles of the keyboard scanning matrix, the connecting primary level resistance and the secondary level resistance form a new level resistance. The new level resistance and the current flowing to the keyboard scanning matrix are processed to get a potential smaller than the reference potential, thereby, to eliminate the phenomenon of ghost keys.
TW095109069A 2006-03-17 2006-03-17 Keyboard without ghost keys TW200737253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW095109069A TW200737253A (en) 2006-03-17 2006-03-17 Keyboard without ghost keys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW095109069A TW200737253A (en) 2006-03-17 2006-03-17 Keyboard without ghost keys

Publications (2)

Publication Number Publication Date
TW200737253A true TW200737253A (en) 2007-10-01
TWI320939B TWI320939B (en) 2010-02-21

Family

ID=45073791

Family Applications (1)

Application Number Title Priority Date Filing Date
TW095109069A TW200737253A (en) 2006-03-17 2006-03-17 Keyboard without ghost keys

Country Status (1)

Country Link
TW (1) TW200737253A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI485991B (en) * 2009-04-06 2015-05-21 Lite On Electronics Guangzhou Ghost key detecting circuit and related method
TWI612443B (en) * 2015-11-25 2018-01-21 達方電子股份有限公司 Keyboard apparatus
US9921664B2 (en) 2015-11-25 2018-03-20 Darfon Electronics Corp. Keyboard device
CN109994334A (en) * 2017-12-29 2019-07-09 致伸科技股份有限公司 Keyboard

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI387209B (en) * 2008-09-26 2013-02-21 Silitek Electronic Guangzhou Control circuit and assign method
TWI612444B (en) * 2017-01-06 2018-01-21 群光電子股份有限公司 Ghost key detecting circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI485991B (en) * 2009-04-06 2015-05-21 Lite On Electronics Guangzhou Ghost key detecting circuit and related method
TWI612443B (en) * 2015-11-25 2018-01-21 達方電子股份有限公司 Keyboard apparatus
US9921664B2 (en) 2015-11-25 2018-03-20 Darfon Electronics Corp. Keyboard device
US10073539B2 (en) 2015-11-25 2018-09-11 Darfon Electronics Corp. Keyboard device
CN109994334A (en) * 2017-12-29 2019-07-09 致伸科技股份有限公司 Keyboard
CN109994334B (en) * 2017-12-29 2020-12-04 致伸科技股份有限公司 Keyboard with a keyboard body

Also Published As

Publication number Publication date
TWI320939B (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