Touch screen device
US8803835B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2012 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Apr 4, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04162
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
It is provided a touch screen device applied in an electronic information technology area. In the touch screen device supporting an active capacitance stylus, a demodulation unit demodulates a signal received by a reception unit by two orthogonal signals, and then an amplitude recovery unit recovers an amplitude of the signal received by the reception unit, the amplitude of the signal received by the reception unit can be recovered relatively exactly without the need that the demodulation signal must be synchronous with the signal received by the reception unit (or the signal transmitted from the active capacitance stylus), and there is no need to add additional hardware resources for synchronization in the touch screen device of the embodiment of the present invention compared with the existing detection method which needs to perform synchronization of the demodulation signal and the signal transmitted from the active capacitance stylus in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.