Tablet with system power saving features including reactivation by pencontact after inactive period
US5909382A · kind A · utility
9Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1996 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Oct 21, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/3262
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digitizing tablet has an improved operation for saving power. After an input device contacts the tablet surface, resistive sheets provide analog pen position signals to a sample/track and hold circuit. Once the signals are captured by the sample/track and hold, power is removed from the resistive sheets and digitization of the analog signals is performed. During an input waiting period, power is further conserved by removing power from the sample/track and hold and analog-to-digital converter, as a separate level detect circuit detects contact with the tablet surface by an input device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.