System for disposing a proximity sensitive touchpad behind a mobile phone keypad
US7151528B2 · kind B2 · utility
271Cited by
13References
57Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2002 |
| Grant date | Dec 19, 2006 |
| Priority date | — |
| Expiry date | Jun 6, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2250/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A proximity-based mutually capacitance-sensitive touchpad that is disposed directly beneath a keypad keymat of a mobile telephone, wherein posts associated with each key pass through a mutually capacitance-sensitive sensor electrode grid of the touchpad such that the keypad posts do not interfere with touchpad detection and tracking of a pointing object that moves along the keypad surface, to thereby enable touchpad data entry, cursor control, and scroll bar control on a display of the mobile telephone, wherein the keypad posts actuate mechanical switches underneath the touchpad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.