TW200737253A - Keyboard without ghost keys - Google Patents
Keyboard without ghost keysInfo
- 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
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.
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)
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)
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 |
-
2006
- 2006-03-17 TW TW095109069A patent/TW200737253A/en not_active IP Right Cessation
Cited By (6)
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 |